• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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  • 优先权
    • 专利摘要:
    The invention relates to an operating circuit for supplying a luminous means (5) which has at least one light-emitting diode (6), wherein the operating circuit comprises an LLC resonant converter (11) with a half-bridge circuit comprising a first switch (41) and a second switch (42 and wherein the operating circuit comprises switch control means (20) for switching the first switch (41) and the second switch (42) alternately clocked, the operating circuit having a first mode of operation for current regulation and a second mode of operation for voltage regulation.
    公开号:AT15988U1
    申请号:TGM115/2015U
    申请日:2015-05-11
    公开日:2018-10-15
    发明作者:Nesensohn Christian
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    OPERATING CIRCUIT FOR SUPPLYING A LUMINAIRE, LED CONVERTER, SYSTEM AND METHOD FOR OPERATING AN OPERATING CIRCUIT The invention relates to an operating circuit for supplying a lighting means, an LED converter, a system with a lighting means and a method for operating such an operating circuit. The invention relates in particular to devices and methods of this type in which an illuminant, in particular an illuminant, which comprises one or more light-emitting diodes, is supplied with energy by an operating circuit which has electrical isolation.
    [0002] An operating circuit for a lamp can comprise a converter which is used to transmit electrical energy from an input side to an output side. Such converters are used in various applications for supplying current or voltage, such as, for example, in switched mode power supplies. Controlled switches are used in clocked converters and are operated clocked in order to transmit electrical energy to the output side.
    Some operating circuits for a lamp are designed so that they work as a constant current source. Other operating circuits for a lamp are designed so that they work as a constant voltage source. Depending on the illuminant used in each case, either an operating circuit or an LED converter, which works as a constant current source, or an operating circuit or an LED converter, which works as a constant voltage source, can be used. The provision of such different types of operating circuits can lead to increased effort and costs.
    There is a need for devices and methods that allow a variety of uses for operating circuits for a lamp. There is a need for such devices and methods that are suitable for use with illuminants that comprise one or more light-emitting diodes.
    According to embodiments, an operating circuit, an LED converter, a system and a method are given with the features specified in the independent claims. The dependent claims define embodiments.
    According to embodiments of the invention, an operating circuit for a lamp comprises an LLC resonance converter. The operating circuit has a first operating mode in which it carries out a current regulation in order to work as a current source. The operating circuit has a second operating mode in which it executes a voltage source in order to operate as a voltage source. One of the first operating mode and the second operating mode can be selected depending on the illuminant with which the operating circuit is to be used.
    The operating circuit according to embodiments can optionally be used both as a current source and as a voltage source. The operating circuit can be configured such that no electrically conductive connections have to be changed in order to reconfigure the operating circuit between the first operating mode and the second operating mode.
    The operating circuit may include a switch control device for clocked switching of switches of the LLC resonant converter. The switch control device can be set up to generate signals for actuating the switches depending on whether the first operating mode or the second operating mode is selected.
    The switch control device can be set up to use a measured variable representing an output current of the operating circuit as a control variable if the operating circuit operates in the first operating mode.
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    Patent Office [0010] The switch control device can be set up to use a measured variable representing an output voltage of the operating circuit as a controlled variable if the operating circuit operates in the second operating mode.
    [0011] The switch control device can have connections in order to receive both the measured variable representing the output current of the operating circuit and the measured variable representing the output voltage of the operating circuit.
    The switch control device can comprise an input with which it can be determined whether current regulation or voltage regulation should take place.
    [0013] The selection as to whether current regulation or voltage regulation should take place can be made in different ways. There can be a mechanically actuated selection element, for example a dip switch, with which the first operating mode and the second operating mode can be selected. There can be a settable circuit element, for example a jumper, with which the first operating mode and the second operating mode can be selected. The operating circuit can include an interface via which the first operating mode and the second operating mode can be selected. The interface can be a communication interface of the operating circuit. The interface can be a supply interface for coupling to a supply voltage. The interface can be set up for coupling to the illuminant in order to automatically recognize whether a current regulation or a voltage regulation should be carried out.
    The operating circuit according to exemplary embodiments and the methods with which it is operated take advantage of the fact that by changing the control with which control signals are generated for an LLC resonance converter, the LLC resonance converter operates well both as a current source and as a voltage source can be. Because the operating modes can be selected, it is no longer necessary to use different operating devices which can either be used only as a voltage source or only as a current source.
    An operating circuit for supplying a lamp, which has at least one light emitting diode, according to one embodiment comprises an LLC resonant converter with a half-bridge circuit which has a first switch and a second switch. The operating circuit comprises a switch control device for mutually clocked switching of the first switch and the second switch. The operating circuit has a first operating mode for current regulation and a second operating mode for voltage regulation.
    The operating circuit can be set up to enable a selection between the first operating mode and the second operating mode.
    The switch control device can be set up to generate signals for controlling the first switch and the second switch in different ways depending on whether the first operating mode or the second operating mode is selected.
    The operating circuit may include an interface that is coupled to the switch controller to enable selection between the first operating mode and the second operating mode.
    The interface through which the selection is made possible can comprise a supply input of the operating circuit. In operation, the operating circuit can be connected to a supply source at the supply input.
    The interface via which the selection is made possible can comprise a communication interface. In operation, the communication interface can be coupled to a bus, for example a DALI (“Digital Addressable Lighting Interface”) bus.
    The interface through which the selection is made possible can be set up for coupling with the illuminant.
    The interface can comprise a user interface with a selection element,
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    Patent office that is coupled to the switch control device to enable the selection. The selection element can comprise an adjustable resistance. The selection element can comprise a dip switch. The selection element can comprise a jumper.
    The switch control device can be set up to generate signals for controlling the first switch and the second switch in accordance with a first control loop in the first operating mode. The switch control device can be configured to generate the signals for controlling the first switch and the second switch in accordance with a second control loop, which is different from the first control loop, in the second operating mode.
    [0024] The first control loop and the second control loop can have different control variables. The first control loop and the second control loop can have the same manipulated variable. The manipulated variable can be, for example, a frequency with which the first switch and the second switch are switched in a clocked manner.
    [0025] The clocked LLC resonance converter can be set up to receive a bus voltage. The switch control device can be set up to generate the signals for driving the first switch and the second switch depending on the bus voltage in the second operating mode. The switch control device can be set up to generate the signals for controlling the first switch and the second switch independently of the bus voltage in the first operating mode. As a result, the gain factor can be set in a voltage control depending on the bus voltage, while the current control can still be implemented in a particularly simple manner.
    The switch control device can be set up to generate the signals for controlling the first switch and the second switch depending on the bus voltage both in the first operating mode and in the second operating mode.
    [0027] The switch control device can comprise an integrated semiconductor circuit which is set up for current regulation.
    The switch control device can comprise a further integrated semiconductor circuit which is coupled to the integrated semiconductor circuit in order to selectively change a potential at at least one connection of the integrated semiconductor circuit when the voltage regulation is to take place. As a result, the further integrated semiconductor circuit, which can be a microprocessor or processor, for example, can selectively influence the mode of operation of the integrated semiconductor circuit if the voltage regulation is to take place.
    An LED converter according to one embodiment comprises the operating circuit according to an embodiment.
    A system according to one embodiment comprises the LED converter or the operating circuit according to an embodiment and a lamp means coupled thereto, which comprises at least one light-emitting diode.
    The LED converter or the operating circuit can be set up to determine, depending on information about the lamp, whether the current control or the voltage control should take place.
    The LED converter or the operating circuit can be set up to query via an interface connected to the illuminant whether the current regulation or the voltage regulation should take place.
    A method for operating an operating circuit for supplying a lamp with at least one light emitting diode according to an embodiment uses an LLC resonance converter with a half-bridge circuit, which has a first switch and a second switch. The method determines whether the operating circuit should be operated as a constant current source or as a constant voltage source. In the method, the first switch and the second switch are driven depending on whether the operating circuit is to be operated as a constant current source or as a constant voltage source.
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    Patent Office The method can be carried out automatically by the operating circuit or the LED converter according to one embodiment.
    The operating circuit can have a first operating mode, which is selected in the method if the operating circuit is to be operated as a constant current source. The operating circuit can have a second operating mode, which is selected in the method if the operating circuit is to be operated as a constant voltage source.
    In order to determine whether the operating circuit should be operated as a constant current source or as a constant voltage source, a signal at an interface of the operating circuit can be evaluated by a switch control device in the method.
    The interface can comprise a supply input of the operating circuit.
    The interface can include a communication interface.
    [0039] The interface can be set up for coupling with the illuminant.
    [0040] The interface may include a user interface with a selection element coupled to the switch controller to enable selection. The selection element can comprise an adjustable resistance. The selection element can comprise a dip switch. The selection element can comprise a jumper.
    In the method, signals for controlling the first switch and the second switch can be generated in accordance with a first control loop in the first operating mode. In the method, the signals for driving the first switch and the second switch can be generated in accordance with a second control loop, which is different from the first control loop, in the second operating mode.
    [0042] The first control loop and the second control loop can have different control variables. The first control loop and the second control loop can have the same manipulated variable. The manipulated variable can be, for example, a frequency with which the first switch and the second switch are switched in a clocked manner.
    [0043] The clocked LLC resonance converter can receive a bus voltage. In the method, the signals for driving the first switch and the second switch can be generated depending on the bus voltage in the second operating mode. In the method, the signals for driving the first switch and the second switch can be generated in the first operating mode independently of the bus voltage.
    In the method, the signals for driving the first switch and the second switch can be generated depending on the bus voltage both in the first operating mode and in the second operating mode.
    The switch control device can comprise an integrated semiconductor circuit which is set up for current regulation and generates control signals for the first switch and the second switch.
    The switch control device may comprise a further integrated semiconductor circuit which is coupled to the integrated semiconductor circuit in order to selectively change a potential at at least one connection of the integrated semiconductor circuit when the voltage regulation is to take place.
    In the devices and methods according to embodiments, an output voltage can be detected using a winding which is arranged on a primary side of the operating circuit and which is inductively coupled to a secondary coil of a transformer of the operating circuit.
    In the devices and methods according to exemplary embodiments, an output current can be detected using a further transformer, which bridges a potential barrier of the operating circuit.
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    Patent Office The invention is explained in more detail below with reference to the accompanying drawing using preferred exemplary embodiments.
    [0050] FIG. 1 FIG. 2 FIG. 3 FIG. 4 FIG. 5 FIG. 6 FIG. 7 FIG. 8 FIG. 9 FIG. 10 shows a schematic illustration of a lighting system with an LED converter according to an exemplary embodiment.
    shows a circuit diagram of an operating circuit according to an embodiment.
    shows a schematic representation of a lighting system with an LED converter according to an embodiment.
    shows a schematic representation of a lighting system with an LED converter according to an embodiment.
    shows a schematic representation of a lighting system with an LED converter according to an embodiment.
    shows a schematic representation of a lighting system with a
    LED converter according to an embodiment.
    is a flowchart of a method according to an embodiment.
    illustrates an operation of an operating circuit according to an embodiment.
    shows an exemplary implementation of a switch control device of an operating circuit according to an embodiment.
    shows a circuit diagram of an operating circuit according to an embodiment.
    The invention is described in more detail below using exemplary embodiments with reference to the figures, in which identical reference numerals represent identical or corresponding elements. The features of different exemplary embodiments can be combined with one another, unless this is expressly excluded in the description. Even if some exemplary embodiments are described in more detail in the context of specific applications, for example in the context of operating devices for LED modules, the exemplary embodiments are not restricted to these applications.
    [0061] FIG. 1 shows a system 1 in which an LED converter 3 with an operating circuit according to one exemplary embodiment supplies a lamp 5 with energy. The illuminant 5 can comprise a light emitting diode (LED) or a plurality of LEDs. The LEDs 6 can be inorganic or organic LEDs.
    During operation, the LED converter 3 is coupled on the input side to a supply voltage source 2, for example a mains voltage. The LED converter 3 can comprise a rectifier 10. The LED converter 3 can optionally comprise a power factor correction formwork (PFC, “Power Factor Correction”) 10. The LED converter 3 comprises a converter 11. The converter 11 can be a DC / DC converter. The converter 11 is designed as an LLC resonance converter, as will be described in more detail below.
    The converter 11 is designed as a clocked converter and has a first controllable switch 41 and a second controllable switch 42. The first controllable switch and / or the second controllable switch 42 can be a circuit breaker. The first controllable switch 41 and / or the second controllable switch 42 can be a transistor with an insulated gate electrode. The first controllable switch 41 and / or the second controllable switch can be a MOSFET. As will be described in detail below, the converter 14 is a converter clocked on the primary side, in which a control device 20 switches the first controllable switch 41 and the second controllable switch 42 clocked.
    The converter 11 can have electrical isolation. A primary side of the converter 11 and a secondary side of the converter 11 can be electrically isolated.
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    This enables a potential separation to be generated between different areas 13, 14 of the LED converter. The output side 14 with the secondary side of the converter can be designed as a SELV (“Separated Extra Low Voltage”) area and can be separated from the input side 13 by a SELV barrier 12. The potential barrier 12 does not necessarily have to be a SELV barrier, but can also be another potential barrier.
    The LED converter 3 can optionally have an output circuit 18 which is coupled to a secondary coil of the converter 11. The output circuit 18 can also be integrated in the lighting means 5.
    As will be described in more detail, the operating circuit is set up so that it can perform voltage regulation of the output voltage or current regulation of the output current. The LED converter 3 can accordingly be used both when the illuminant 5 has to be supplied with a certain current on average, and also when the illuminant 5 requires a voltage supply with an operating voltage.
    The same converter 11 can be used to transmit energy across the potential barrier 12, regardless of whether the operating circuit performs current regulation or voltage regulation. The control device 20 can control the controllable switches 41, 42 of the converter 11 differently, depending on whether current regulation or voltage regulation is carried out. The control device 20 can have an input 21 for receiving a signal l_sns, which represents an output current of the operating circuit, for example at the output of the LED converter 3. The control device 20 can have a further input 22 for receiving a signal Vsns, which represents an output voltage of the operating circuit, for example at the output of the LED converter 3.
    If a selection of a first operating mode takes place in which the operating circuit carries out a current regulation, the control device 20 can generate control signals for actuating the switches 41, 42 depending on a comparison of the detected output current with a current setpoint. A frequency and / or threshold values for a switch actuation can be set depending on the comparison of the detected output voltage with the current setpoint.
    If a selection of a second operating mode takes place in which the operating circuit carries out a voltage regulation, the control device 20 can generate control signals for actuating the switches 41, 42 depending on a comparison of the detected output voltage with a voltage setpoint. A frequency and / or threshold values for a switch actuation can be set depending on the comparison of the detected output voltage with the voltage setpoint.
    The first operating mode or the second operating mode can be selected before the LED converter 3 is installed or when the LED converter 3 is installed. The selection can also be made when the LED converter 3 is installed. The first operating mode or the second operating mode can be selected in different ways, as will be described in more detail below.
    [0071] FIG. 2 is a circuit diagram of an operating circuit 30 according to an embodiment. The operating circuit 30 comprises a converter with a primary-side circuit 40 and a secondary-side circuit 50. There is potential isolation between the primary-side circuit 40 and the secondary-side circuit 50. A transformer with a primary coil 31 and a secondary coil 32 can be provided for separation.
    The converter is designed as an LLC resonance converter. The main inductor of the transformer can act as one of the inductors of the LLC resonant circuit. A separate inductive element 43 or a leakage inductance of the transformer can act as a further inductance of the LLC resonant circuit. A capacitive element or a stray capacitance can form a capacitance 45 of the LLC resonant circuit. According to the general terminology
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    AT15 988U1 2018-10-15 Austrian patent office in this technical field the term “LLC resonance circuit” or “LLC resonance converter” is used here to mean a resonance circuit with two inductors and one capacitance or a corresponding converter, whereby it does not matter whether as shown in FIG. 2, one of the inductors is connected between the capacitance 45 and the inductor 43 or whether the capacitor is connected between the two inductors. Likewise, the inductor 43 can be integrated in the primary coil 31 of the transformer as a leakage inductor.
    The primary-side circuit 40 comprises a half-bridge circuit with a first switch 41, which can be a circuit breaker, and a second switch 42, which can be a circuit breaker. The first switch 41 and the second switch 42 can be identical, and the half-bridge circuit can be designed as a symmetrical half-bridge circuit.
    The resonant circuit may be connected to a node between the first switch 41 and the second switch 42. The resonance circuit is connected to the center of the half-bridge circuit between the two switches 41 and 42. A first connection of the first inductor 43 of the LLC resonant circuit can be connected to the node between the first switch 41 and the second switch 42 of the half-bridge circuit. A second connection of the first inductance 43 can be connected to a first connection of a further inductance of the LLC resonance circuit. A second connection of the further inductance can be connected to the capacitance 45 of the resonance circuit.
    In the operation of the converter 30, the control device 20 controls the first switch 41 and the second switch 42. Each of the switches can be switched on and off with the same predetermined frequency. The control device 20 can control the first switch 41 and the second switch 42 such that a maximum of one of the two switches is always turned on. The first switch 41 and the second switch 42 can be operated alternately clocked by the control device 20. A dead time between switching off a switch and switching on the other switch can be short, in particular much smaller than the inverse of the switching frequency.
    The secondary-side circuit 50 has a rectifier connected to the secondary coil 32, which can be formed, for example, by a first diode 51 and a second diode 52. An output capacitor 53 can be provided. The output capacitor 53 can be coupled directly or via an optionally available inductor 54 to an output 55 of the operating circuit.
    A load 5 connected to the output 55 of the operating circuit can comprise an LED, an LED path, a plurality of LEDs or a plurality of LED paths. The LEDs can be LEDs of an LED module.
    The secondary-side circuit 50 can be a SELV region 14, which is separated from the primary-side region 13 by a SELV barrier 12. The primary-side circuit 40 can include all components that do not belong to the SELV range.
    The control device 20, which generates control signals for the first switch 41 and the second switch 42, can operate according to a first operating mode. In the first operating mode, current regulation takes place in order to set an output current l 0Lrt to a current setpoint on average over time. In the second operating mode, voltage regulation takes place in order to set an output voltage V out to a voltage setpoint on average over time.
    In the first operating mode, a measurement variable Isns which is dependent on the output current I 0Lrt can be used by the control device 20 as a control variable. The measured variable l_sns can be the output current itself, but can also be another measured variable that is proportional to the output current or otherwise dependent on the output current.
    In the first operating mode, a measurement variable Vsns dependent on the output voltage V 0Lrt can be used by the control device 20 as a control variable. The Mess7 / 21
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    The output voltage itself can be large Vsns, but can also be another measurement variable that is proportional to the output voltage or otherwise dependent on the output voltage. In particular, the measurement variable V sns can be detected inductively, for example, by a winding which is inductively coupled to the secondary coil 32 of the transformer and which is arranged on the primary side 40. Alternatively, the measurement variable V sns can be recorded on the secondary side 50 and returned to the primary side 40 via an optocoupler.
    A selection of whether the operating circuit should perform current regulation or voltage regulation can be carried out in different ways, as with reference to FIG. 3 to FIG. 6 is described in more detail. The selection of whether the operating circuit should carry out a current regulation or a voltage regulation can be made user-defined or automatically by the operating circuit itself.
    [0083] FIG. 3 shows a system 1 with an operating circuit according to an exemplary embodiment. The operating circuit comprises a selection element 23 with which it can be determined whether the operating circuit is to carry out a current regulation or a voltage regulation.
    The selection element 23 can comprise a mechanically actuable switch, for example a dip switch. Depending on a switch position, the control device 20 can control the switches 41, 42 in such a way that current regulation is carried out for a first position of the mechanically actuatable switch and voltage regulation is carried out for a second position of the mechanically actuated switch.
    [0085] The selection element 23 can comprise a jumper. Depending on whether the jumper is set, the control device 20 can control the switches 41, 42 in such a way that current regulation or voltage regulation takes place.
    Other configurations of the selection element 23 can be used. For example, adjustable resistors or other coding elements can be used, which encode information about whether the operating circuit should be operated as a constant voltage source or as a constant current source.
    FIG. 4 shows a system 1 with an operating circuit according to an exemplary embodiment. The operating circuit comprises a communication interface 24. The communication interface 24 can be set up for a connection to a bus, for example a DALI bus.
    Via the communication interface 24, a selection can be made as to whether the operating circuit should carry out a current regulation or a voltage regulation. Depending on a signal on the communication interface 24, the operating circuit can determine whether it should work as a current source or as a voltage source. For this purpose, a programming device 9 can be detachably connected to the communication interface 24, for example, before installing the LED converter 3. The programming device 9 can be used to determine whether the control device 20 actuates the switches 41, 42 in such a way that current regulation takes place, or actuates such that voltage regulation takes place.
    The operating circuit may comprise a non-volatile memory 25, in which it is stored whether the first operating mode for current regulation or the second operating mode for voltage regulation has been selected. The non-volatile memory 25 can be integrated in the control device 20.
    The programming device 9 can be disconnected from the operating circuit before the operating circuit is connected to the illuminant 5.
    As an alternative or in addition, the operating circuit can also be set up to receive information on the communication interface 24 via a bus, for example a DALI bus, which determines whether current regulation or voltage regulation is to take place.
    A selection as to whether the operating circuit should operate in the first operating mode for current regulation or in the second operating mode for voltage regulation cannot only be made via the communication interface 24. For example, the control device 20
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    Patent office can also be coupled with another interface of the LED converter 3 and set up to recognize whether a signal is received via the other interface, with which it is determined whether the operating circuit in the first operating mode for a current control or in the second operating mode for a Voltage regulation should work. This other interface can be, for example, a supply input, as shown in FIG. 5, or an interface set up for connection to the illuminant 5, as shown in FIG. 6 shown. The other interface, via which it can be selected whether the operating circuit should work in the first operating mode for current regulation or in the second operating mode for voltage regulation, can be designed in such a way that it is in useful operation of the operating circuit with a sensor, for example a temperature sensor or a brightness sensor is connected.
    [0093] FIG. 5 shows a system 1 with an operating circuit according to an exemplary embodiment. The operating circuit comprises a supply input for connection to the supply source 2.
    The control device 20 can be connected to the supply input in order to recognize whether it is determined via the supply input whether the operating circuit should carry out a current regulation or a voltage regulation. A selection can be made via the supply input as to whether the operating circuit should carry out a current regulation or a voltage regulation. Depending on a signal at the supply input, the operating circuit can determine whether it should work as a current source or as a voltage source.
    For this purpose, a programming device 9 can be detachably connected to the supply input, for example, before installing the LED converter 3. The programming device 9 can be used to determine whether the control device 20 actuates the switches 41, 42 in such a way that current regulation takes place, or in such a way that voltage regulation takes place.
    The operating circuit can comprise a non-volatile memory 25, in which, depending on the signal at the supply input, it is stored whether the first operating mode for current regulation or the second operating mode for voltage regulation has been selected. The non-volatile memory 25 can be integrated in the control device 20.
    The programming device 9 can be disconnected from the operating circuit before the operating circuit is connected to the illuminant 5 and the supply source 2.
    FIG. 6 shows a system 1 with an operating circuit according to an exemplary embodiment. The operating circuit comprises a connection 26 for connection to the lighting means 5. The operating circuit can be set up to automatically read or receive information from the lighting means 5, which determines whether the control device 20 controls the switches 41, 42 for current regulation or voltage regulation should.
    The illuminant 5 can comprise a coding element 7, which determines whether the illuminant 5 is designed for a supply from a constant current source or for a supply from a voltage source. The coding element 7 can be, for example, a resistor or another element that determines whether the operating circuit for supplying the illuminant 5 should work in the first operating mode or the second operating mode.
    Other techniques can be used with which the operating circuit can automatically receive information from the illuminant 5 which determines which operating mode is to be used. For example, the illuminant 5 can comprise a microcontroller or another integrated semiconductor circuit which transmits a signal to the operating circuit via a communication link and thus determines whether the operating circuit should operate in the first operating mode or in the second operating mode.
    [00101] FIG. 7 is a flowchart of a method 60 according to an embodiment. The method 60 can be carried out automatically with an operating circuit or an LED converter according to one exemplary embodiment.
    At 61, it is determined whether the operating circuit is in a first operating mode for a
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    Current control or should work in a second operating mode for voltage control. For this purpose, it can be determined in which of two states a user-selectable selection element 23 is located. Alternatively or additionally, a signal can be evaluated that is received at an interface. The interface can be a communication interface 24, a supply input or an interface 26 set up for coupling with the illuminant 5.
    At 62 it is determined, depending on whether the operating circuit is to work in the first operating mode for current regulation or in the second operating mode for voltage regulation, which input signal of control device 20 is to be used for regulation. In the first operating mode, a measured variable l_sns, which depends on the output current, can be used as a controlled variable, which is compared with a current setpoint in order to generate control signals for the switches 41, 42. In the first operating mode, a measured variable Vsns, which depends on the output voltage, can be used as a controlled variable, which is compared with a voltage setpoint in order to generate control signals for the switches 41, 42.
    In step 63, the switches 41, 42 of the LLC resonance converter are switched in a clocked manner. At least one frequency and / or a switching threshold value for switching the switches 41, 42 can depend on whether the operating circuit should work in the first operating mode for current regulation or in the second operating mode for voltage regulation.
    The control device 20 can operate the switches 41, 42 depending on whether the first operating mode for current regulation or the second operating mode for voltage regulation is selected in different ways. For example, switching frequencies from different frequency ranges can be used to carry out current regulation on the one hand and voltage regulation on the other hand.
    [00106] FIG. 8 is a schematic representation of a Bode diagram for an LLC resonant converter of an operating circuit according to an exemplary embodiment, which shows a gain as a function of the frequency with which the switches 41, 42 are switched clocked. A frequency f 0 shown at 72 may correspond to the resonance frequency of the LLC resonance circuit. The amplification can have a maximum at a frequency f ' o shown at 73.
    If the operating circuit works in the first operating mode for a current control, frequencies from a first frequency range 74 can be used. If the operating circuit operates in the first operating mode for current regulation, frequencies from a second frequency range 75 can be used.
    [00108] The second frequency range 75 can be different from the first frequency range 74. For example, the second frequency range can comprise 75 frequencies that lie between the frequency f ' o at which the amplification has a maximum and the resonance frequency f 0 of the LLC resonance circuit. The second frequency range 75 can be such that it only comprises frequencies that are less than or equal to the resonance frequency f 0 of the LLC resonance circuit. The first frequency range 74 may include frequencies that are greater than the resonance frequency f 0 of the LLC resonance circuit. The first frequency range can be such that it only encompasses frequencies that are greater than the resonance frequency f 0 of the LLC resonance circuit.
    [00109] Other configurations are possible. For example, switching frequencies that are greater than the resonance frequency f 0 of the LLC resonance circuit can also be used for voltage regulation.
    The control device 20 can be designed such that, alternatively or in addition to the switching frequency, other parameters of the control loop vary depending on whether the operating circuit works in the first operating mode for current regulation or in the second operating mode for voltage regulation. For example, the controller can be a shorter one
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    Have response time, i.e. be faster if there is a current control than if there is a voltage control.
    The control device 20 can be configured to take into account a bus voltage, which is supplied to the LLC resonance converter 11 by the power factor correction circuit 13, in the voltage regulation and / or the current regulation. The bus voltage can be taken into account in the control loop at least in the second operating mode in which the voltage regulation takes place. The bus voltage can optionally also be taken into account in the control loop in the first operating mode in which the current control takes place.
    The control device 20 can comprise at least one semiconductor integrated circuit. The at least one integrated semiconductor circuit can be designed as a microcontroller, controller, microprocessor, processor, application-specific special circuit (ASIC, “application specific integrated circuit”) or a combination thereof.
    [00113] FIG. 9 illustrates an implementation of a controller 20 that may be used in an operating circuit according to an embodiment. The control device 20 comprises an integrated semiconductor circuit 28. The integrated semiconductor circuit 28 can be set up to generate control signals ctrll, ctrl2 for controlling the switches 41, 42 of the LLC resonance converter. The integrated semiconductor circuit 28 can be set up to carry out a control circuit for a current control and to switch the LLC resonant converter in a clocked manner as a function of a measured variable l_sns, which depends on the output current. The semiconductor integrated circuit 28 can be a controller.
    [00114] The control device 20 can comprise a further integrated semiconductor circuit 27. The further semiconductor integrated circuit 27 can be set up to selectively provide a signal Vreg to an input of the semiconductor integrated circuit 28, which is used to determine that voltage regulation should take place.
    The further integrated semiconductor circuit 27 can generate the signal Vreg depending on a programming of the operating circuit or depending on a state in which a selection element 23 is set. The further integrated semiconductor circuit 27 can be a processor.
    The detection of the measured variable l_sns, which represents the output current, and the measured variable Vsns, which represents the output voltage, can be carried out in different ways in operating circuits and methods according to exemplary embodiments. The measured variable V sns representing the output voltage can be detected using a winding which is arranged on a primary side of the operating circuit and which is inductively coupled to a secondary coil 32 of the transformer of the operating circuit. In this way, feedback of the output voltage using an optocoupler can be avoided.
    [00117] FIG. 10 shows an implementation of the detection of the measured variable l_sns, which represents the output current, and the measured variable V sns, which represents the output voltage, in operating circuits and methods according to exemplary embodiments.
    To detect the output voltage, the operating circuit can be designed so that a voltage V sns can be detected, which is induced on a winding or other inductor 81. The inductor 81 is inductively coupled to the secondary coil 32. The inductance 81 can be different from the primary coil 31, so that the voltage detection is not carried out directly on the primary coil 31.
    [00119] The output voltage at the output 55 of the operating circuit can be determined based on the voltage induced on the winding 81. When the switches 41, 42 of the half-bridge circuit are switched, energy is transferred until the capacitor 53 is charged. The load 5 clamps the voltage across the capacitor 53 to a value that corresponds to the forward voltage of the LEDs of the lamp. The voltage on the secondary coil corresponds to the output voltage of the circuit minus that across the rectifier diodes 51, 52
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    Correspondingly, information about the output voltage at the output 55 can be derived from the maximum value of the voltage that occurs at the switching of the switches 41, 42 on the secondary coil 32. For this purpose, the maximum value of the voltage at the inductor 81 is detected, for example, via a voltage divider 82.
    [00121] The voltage divider 82 can be a high-resistance voltage divider. The voltage divider 82 can be an ohmic voltage divider with at least two resistors 83, 84. A diode 25 can optionally be provided in parallel with a resistor 84 of the voltage divider. The diode 85 can serve to protect a subsequent A / D converter and / or a subsequent integrated semiconductor circuit, for example the control device 20, in order to limit negative voltages in the second switching phase to a minimum voltage. In the case of negative voltages, the voltage is limited to the forward voltage of the diode.
    The voltage Vsns across the resistor 84 can, optionally after A / D conversion, be supplied to the control device 20.
    In order to determine the output voltage of the operating circuit, the forward voltage of the rectifier diodes 51, 52 can be taken into account. In further exemplary embodiments, the voltage at the rectifier diodes 51, 52 can be neglected.
    The operating circuit may be set up to detect the output current I out . For this purpose, a transformer for current measurement can be provided, which comprises at least one inductance 96, 97. The at least one inductor 96, 97 can be connected between the secondary coil 32 and the rectifier diode 51, 52. There may be a first inductor 96 in the path between the secondary coil 32 and the rectifier diode 51. There may be a second inductor 97 in the path between the secondary coil 32 and the rectifier diode 52.
    The first inductor 96 and the second inductor 97 can be inductively coupled via the potential barrier to an inductor 91 of the transformer for the current measurement. The inductance 91 can be provided on the primary side of the operating circuit. The inductance 91 can be connected to a capacitor 95 via a rectifier 92 and a resistor 94. Another resistor 93 may be connected in parallel with capacitor 95. The voltage across the capacitor 95 is proportional to the output current and represents a measured value l_sns, which can be detected on the primary side of the operating circuit and represents the output current l out .
    The measured value l_sns, which represents the output current of the operating circuit, can be used in combination with the voltage V sns detected at the inductor 81 in order to determine the output voltage of the operating circuit.
    [00127] The operating circuit can optionally comprise a capacitance 58 and / or at least one inductor 56, 57 on the secondary side. These components can also be omitted.
    [00128] Other configurations can be used in further exemplary embodiments. For example, the output voltage can also be detected on the secondary side and passed over the potential barrier 12 via an optocoupler or another electrical isolation.
    [00129] While exemplary embodiments have been described with reference to the figures, modifications can be implemented in further exemplary embodiments. While the operating circuit can be designed in such a way that the first operating mode and the second operating mode can be reversibly selected and the selection can then be changed again, the operating circuit can also be designed in accordance with further exemplary embodiments in such a way that a change in the operating mode selection once prevented or is complicated by security measures.
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    Patent Office [00130] Inductors or capacitors can each be formed by corresponding inductive or capacitive elements, for example as coils or capacitors. However, it is also possible that smaller inductors, for example the smaller inductor of the LLC resonant circuit, are designed as leakage inductors. Similarly, smaller capacities can be designed as stray capacities.
    [00131] Converters and methods according to exemplary embodiments can be used, in particular, to supply a lamp which comprises LEDs.
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    权利要求:
    Claims (17)
    [1]
    Expectations
    Operating circuit for supplying a lamp (5) which comprises at least one light-emitting diode (6), the operating circuit comprising an LLC resonance converter (11) with a half-bridge circuit which has a first switch (41) and a second switch (42) , and a switch control device (20) for mutually clocked switching of the first switch (41) and the second switch (42), characterized in that the operating circuit has a first operating mode for current regulation and a second operating mode for voltage regulation.
    [2]
    2. Operating circuit according to claim 1, characterized in that the operating circuit is set up to enable a selection between the first operating mode and the second operating mode, and / or that the operating circuit comprises an interface (24; 26) which is connected to the switch control device ( 20) is coupled to enable the selection between the first operating mode and the second operating mode.
    [3]
    3. Operating circuit according to claim 2, characterized in that the interface comprises a supply input for connection to a supply line or a communication interface (24), and / or that the interface (26) is set up for coupling to the lighting means (5).
    [4]
    4. Operating circuit according to claim 2 or 3, characterized in that the interface comprises a user interface with a selection element (23) which is coupled to the switch control device (20) to enable the selection.
    [5]
    5. Operating circuit according to one of the preceding claims, characterized in that the switch control device (20) is set up in the first operating mode to generate signals for driving the first switch (41) and the second switch (42) according to a first control loop, and to generate the signals for driving the first switch (41) and the second switch (42) in the second operating mode according to a second control loop which is different from the first control loop.
    [6]
    6. Operating circuit according to claim 5, characterized in that the clocked LLC resonance converter (11) is set up to receive a bus voltage, and that the switch control device (20) is set up in the second operating mode to control the signals for driving the first switch (41) and the second switch (42) depending on the bus voltage.
    [7]
    7. Operating circuit according to one of the preceding claims, characterized in that the switch control device (20) comprises an integrated semiconductor circuit (28) which is set up for current regulation, and wherein the switch control device (20) comprises a further integrated semiconductor circuit (27) which is coupled to the integrated semiconductor circuit (28) in order to selectively change a potential at at least one connection of the integrated semiconductor circuit (27) when the voltage regulation is to take place.
    [8]
    8. LED converter, characterized in that the LED converter comprises the operating circuit according to one of the preceding claims.
    [9]
    9. System, characterized in that the system comprises the LED converter (3) according to claim 8 and an illuminant (5) which comprises at least one light-emitting diode (6), and wherein the LED converter (3)
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    Patent office is set up to determine depending on information about the illuminant (5) whether the current control or the voltage control takes place.
    [10]
    10. Method for operating an operating circuit for supplying a light source (5), which comprises at least one light-emitting diode (6), the operating circuit comprising an LLC resonance converter (11) with a half-bridge circuit, which has a first switch (41) and a second switch (42) comprises, characterized in that the method comprises the following steps:
    Determine whether the operating circuit should be operated as a constant current source or as a constant voltage source, and
    Driving the first switch (41) and the second switch (42) depending on whether the operating circuit is to be operated as a constant current source or as a constant voltage source.
    6 sheets of drawings
    [11]
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    1.6
    FIG. 1
    [12]
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    2.6
    [13]
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    3/6 jL
    Programming device
    [14]
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    4.6
    FIG. 6
    FIG. 7
    [15]
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    5.6
    27 28
    FIG. 9
    [16]
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    6.6
    FIG. 10
    [17]
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    引用文献:
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    法律状态:
    2021-01-15| MM01| Lapse because of not paying annual fees|Effective date: 20200531 |
    优先权:
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    DE102014223377.1A|DE102014223377A1|2014-11-17|2014-11-17|Operating circuit for supplying a light source, LED converter, system and method for operating an operating circuit|EP15813235.7A| EP3222119B1|2014-11-17|2015-11-13|Operating circuit for energizing a light-emitting element, led converter, system and method for operating an operating circuit|
    PCT/AT2015/050292| WO2016077855A2|2014-11-17|2015-11-13|Operating circuit for energizing a light-emitting element, led converter, system and method for operating an operating circuit|
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