• 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 a control circuit which is designed to control a first switch and a second switch of a half-bridge circuit of an LLC circuit for operating one or more lighting means, the first switch and the second switch being connected in series, the control circuit being designed To control the first switch and the second switch in such a way that there is a dead time between switching off the first switch and switching on the second switch and between switching on the first switch and switching off the second switch, the control circuit is also designed in such a way, the dead time adapt in at least two stages and / or continuously depending on a signal fed to the control circuit, the signal fed to the control circuit directly or indirectly reproducing the voltage across the one or more illuminants, or assigning a predetermined value to the dead time sen and in the further course of the activation of the first and the second switch to reduce or increase the dead time or to adapt the dead time depending on one or more pieces of information on lamp voltages and depending on the signal supplied to the control circuit, each of the one or more pieces of information having a first Specification and a second specification, the first specification comprising a lamp voltage value or a lamp voltage range and the second specification comprising a dead time to be set for the lamp voltage value or for the lamp voltage range of the first specification.
    公开号:AT16991U1
    申请号:TGM18/2017U
    申请日:2017-01-24
    公开日:2021-02-15
    发明作者:
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    ADAPTING THE DEAD TIME OF AN LLC CIRCUIT
    The present invention relates to a control circuit for controlling two switches of an LLC ("inductor-inductor-capacitor") circuit for one or more illuminants and to an operating device for the one or more illuminants which has the control circuit .
    LLC circuits are well known. They are often used to provide current / voltage to one or more light sources and thus serve as a current or voltage source. The LLC circuit typically includes a primary-side half-bridge circuit which drives the LLC circuit. The half-bridge circuit has a first and a second switch, which are switched alternately in order to transmit electrical energy (current / voltage). Between the switching off of one switch and the switching on of the other switch, there is a dead time for a short period in which both switches are switched off. In the dead time, the midpoint of the half-bridge circuit of the LLC circuit has time to charge from the chassis ground (GND for short) to the supply voltage (e.g. a bus voltage) and vice versa from the supply voltage to GND.
    In the known LLC circuits, a fixed dead time is often used with regard to the entire load / energy range. In particular, the defined dead time is used with regard to the different dimming levels of dimmable lamps. This means that the system is limited by the voltage of the lamps. In fact, a longer dead time is required for low illuminant (e.g. light-emitting diode (LED)) voltages and a shorter dead time (usually a very short time compared to an average dead time) for high illuminant (e.g. LED) voltages . What is required is a dead time that can adapt to the lamp voltage (e.g. LED voltage).
    However, the adaptation of the dead time can not be flown in a soft switching operation ("SoftSwitching"), since this would take place at the expense of efficiency and safe operation.
    In addition, it should be noted that if the dead time is too long, a swing can occur, whereby the subsequent switching on of one of the switches is no longer soft (ie at zero midpoint voltage), but hard (ie when a midpoint voltage is applied) . This can lead to a fixed dead time not being able to simultaneously cover all operating states of the illuminants to be operated (e.g. LEDs) and in particular the different voltages of the illuminants. Different voltages arise in the case of LEDs, for example, in that LED modules with different LEDs and in particular with different numbers of LEDs are operated by the same converter or operating device.
    It is therefore the object of the present invention to enable an improved energy supply to one or more illuminants (e.g. LEDs).
    [0007] According to the invention, this object is achieved by the features of the independent claims. The dependent claims specify further developments of the invention.
    The present invention is based in particular on the idea of improving the energy supply of the one or more illuminants (e.g. LEDs) by means of an adjustable dead time.
    In this way, it can be achieved in a simple and efficient manner that the dead time becomes shorter, for example, with a growing lamp voltage and becomes longer with a decreasing lamp voltage.
    Thus, the dead time can be optimally adjusted, e.g. with regard to different dimming levels of dimmable lamps (e.g. LEDs). The system is no longer limited by the voltage of the lamps. The dead time can be adjusted with regard to the given, i.e. currently present lamp voltage (e.g. LED voltage), without the efficiency and the safe
    Impair the operation of the entire system (i.e. the supply of the lamps and the lamps themselves).
    According to one aspect of the present invention, a control circuit is provided, wherein the control circuit is configured: to control a first switch and a second switch of a half-bridge circuit of an LLC circuit for operating one or more illuminants, the first switch and the second switch in Are connected in series, wherein the control circuit is configured to control the first switch and the second switch such that there is a dead time between the switching off of the first switch and the switching on of the second switch and between the switching on of the first switch and the switching off of the second switch; and adapt the dead time, wherein the control circuit is configured to perform at least one of the following actions: adapt the dead time in at least two stages and / or continuously depending on a signal supplied to the control circuit, the signal supplied to the control circuit indicating the voltage across the one or the other reproduces multiple lamps directly or indirectly; to assign a predetermined value to the dead time and to reduce or increase the dead time in the further course of the activation of the first and the second switch; adapt the dead time depending on one or more pieces of information on lamp voltages and depending on the signal fed to the control circuit, each of the one or more pieces of information having a first indication and a second indication, the first indication comprising a lamp voltage value or a lamp voltage range and the second indication includes a dead time to be set for the lamp voltage value or for the lamp voltage range of the first specification.
    According to one embodiment, reducing the dead time or increasing the dead time is event-dependent and / or time-dependent.
    According to one embodiment, the control circuit is designed: to compare the voltage that is reproduced by the supplied signal with the lamp voltage value or with the lamp voltage range of the first item of information of the one or more items of information on lamp voltages; and to set the dead time to the dead time to be set for the second item of information if the voltage which is reproduced by the supplied signal is equal to or approximately the same as the lamp voltage value of the first item of information or is in the lighting device voltage range of the first item of information.
    According to one embodiment, the one or more pieces of information are stored in a table and the control circuit is designed to take the one or more pieces of information from the table.
    According to one embodiment, the table is a look-up table or a hash table.
    According to one embodiment, the supplied signal reflects the voltage across the one or more lighting means directly when the voltage across the one or more lighting means was measured directly on the one or more lighting means, and the supplied signal the voltage indirectly reproduces via the one or more illuminants when the voltage was detected over at least one component of the LLC circuit and was not measured on the one or more illuminants.
    According to one embodiment, the control circuit is designed to receive the supplied signal from a detection coil on a secondary side of the LLC circuit.
    According to one aspect of the present invention, an operating device is provided, in particular a converter, for operating one or more lighting means, wherein the operating device is designed to operate one or more lighting means, and wherein the operating device has a control circuit, the control circuit of the corresponds to control circuitry discussed herein.
    According to one embodiment, the operating device has the LLC circuit, which has the half-bridge circuit with the first switch and with the second switch, wherein the first switch and the second switch are connected in series and the control circuit is designed, the first switch and to control the second switch, the dead time being adapted by the control circuit when the first switch and the second switch are activated.
    According to one embodiment, the LLC circuit has at least one component which is designed to detect the voltage across the one or more illuminants, to generate the signal to be supplied to the control circuit by integrating the detected voltage into the signal and to generate the to supply the generated signal to the control circuit.
    According to one embodiment, a detection coil is arranged on a secondary side of the LLC circuit, which is coupled to a secondary-side winding of the LLC circuit, wherein the detection coil is designed to detect the voltage across the one or more illuminants that the To generate the signal to be supplied to the control circuit by integrating the detected voltage into the signal and to supply the generated signal to the control circuit.
    Further features, advantages and properties of the present invention will now be explained with reference to the figures of the accompanying drawings and the detailed description of exemplary embodiments. Here shows:
    [0023] FIG. 1 shows an embodiment of an operating device for operating lighting means according to an embodiment of the present invention;
    FIG. 2 shows an exemplary alternate switching on and off of the two switches of the half-bridge circuit of the LLC circuit according to an embodiment of the present invention;
    Fig. 3 shows steps for adjusting dead time according to an embodiment of the present invention;
    Fig. 4 shows steps for adjusting dead time according to an embodiment of the present invention;
    [0027] FIG. 5a shows an exemplary configuration of information relating to a lamp voltage according to an embodiment of the present invention;
    5b shows an exemplary embodiment of a table (e.g. a look-up table or a hash table) with one or more pieces of information on various lamp voltages according to an embodiment of the present invention;
    Figure 6 shows steps for adjusting dead time according to an embodiment of the present invention.
    In the following, components with the same or similar functions are denoted by the same reference symbols in the figures. In addition, it should be pointed out that the embodiments explained herein can be combined with one another, unless a combination is explicitly excluded.
    Fig. 1 shows an exemplary embodiment of an operating device 1 for operating one or more lighting means 128 (e.g. LEDs) according to an embodiment of the present invention.
    The operating device 1 has an LLC circuit. The LLC circuit has a primary-side circuit 111 to 116 and a secondary-side circuit 118 to 127.
    From its primary side 111 to 116 the LLC circuit has a half-bridge circuit 111 to 113, i.e. the half-bridge circuit 111 to 113 is arranged in the primary-side circuit 111 to 116 of the LLC circuit. The half-bridge circuit 111 to 113 has a first switch 111 and a second switch 112. By switching the switch 111,
    112 controls the flow of current through the LLC circuit. In addition, the half-bridge circuit 111 to 113 includes a midpoint 113.
    The operating device 1 is supplied by a supply voltage 110. In the embodiment of FIG. 1, the supply voltage 110 is a bus voltage Veus. The energy provided by the supply voltage 110 (i.e. current, voltage) is first fed to the primary side 111 to 116 of the LLC circuit and in particular to the half-bridge circuit 111 to 113. The energy supplied by the supply voltage 110 is then conducted to the outputs 127 of the LLC circuit by the switching of the switches 111, 112 of the half-bridge circuit 111 to 113 through the LLC circuit. The energy (i.e. current, voltage) is then fed through the outputs 127 to one or more lighting means 128 (e.g. LEDs) for operating the one or more lighting means 128.
    The switches 111, 112 of the half-bridge circuit 111 to 113 are designed according to the present embodiment as power switches. According to a further embodiment, the first switch 111 is designed as a switch with a higher potential and the second switch 112 as a switch with a lower potential. According to the further embodiment, the lower-potential switch 112 is connected to a primary-side ground, and the input voltage 110, such as the bus voltage Veus, is applied to the higher-potential switch 111.
    According to another embodiment, the switches 111, 112 are identical, and the half-bridge circuit 111 to 113 is then designed as a symmetrical half-bridge circuit.
    In general, at least one of the switches 111, 112 according to further embodiments which can be combined with the embodiments described herein, is designed as a transistor, e.g. field effect transistor (FET) or metal-oxide-semiconductor field-effect transistor (MOSFET).
    According to the present embodiment, the switches 111, 112 are controlled by a control circuit 129. This takes place, for example, by means of corresponding control signals that are generated by the control circuit 129 and transmitted from the control circuit 129 to the switches 111, 112, which is indicated in FIG. 1 by arrows that lead from the control circuit 129 to the switches 111, 112 . The control circuit 129 is designed to clock the switches 111, 112, for example. When driven by the control circuit 129, each of the switches 111, 112 is switched on for a switch-on period of time (i.e. is conducting, is ON) and then switched off (i.e. is non-conducting, is OFF). The switches 111, 112 are switched alternately, i.e. if one of the switches 111, 112 is switched on, the other switch 111, 112 is switched off.
    The activation of the switches 111, 112 by the control circuit 129 takes place in such a way that between the switching off of one switch 111, 112 and the switching on of the other switch 111, 112 in the half-bridge circuit 111 to 113 there is a dead time during which none of the Switch 111, 112 is switched on / activated (ie switched on) or during which both switches 111, 112 are switched off. When activating the switches 111, 112, the situation in which both switches are switched on (i.e. switched on) is avoided.
    The alternating switching on and off of the switches 111, 112 is shown by way of example in FIG. In FIG. 2, in particular, the switched-on states of the switches 111, 112 are correspondingly indicated by "111 on" and "112 on". As can be seen from FIG. 2, the switches 111, 112 are switched on and off alternately. That is, when one switch 111, 112 of the two switches 111, 112 is switched on, the other switch 111, 112 is switched off, and when one switch 111, 112 is subsequently switched off (for example after a predetermined switch-on time has elapsed) the other switch becomes 111 , 112 switched on. Between each switching on and off of the two switches 111, 112, the dead time tot is given or provided, in which both switches 111, 112 are switched off.
    According to an embodiment of the present invention, the midpoint voltage Vmp is detected at the midpoint 113 of the half-bridge circuit 111 to 113. If the switch 112 is designed as a lower potential switch and the switch 111 as a higher potential switch
    In addition, the midpoint voltage Vmp is detected, for example, in a time phase of the timing of the switches 101, 102, in which the lower-potential switch 112 is open / switched on (i.e. conductive). In particular, during the detection of the midpoint voltage Vmp at the midpoint 113 of the half-bridge circuit 111 to 113, only the switch 111 with a higher potential is closed or switched off.
    According to the embodiment of FIG. 1, the primary-side circuit 111 to 116 of the LLC circuit further comprises an inductance 114 and a capacitor or a capacitance 115. Furthermore, the primary-side circuit 111 to 116 comprises a converter winding 116 (for example inductance, coil) . The converter winding 116 is supplied from the half-bridge circuit 111 to 113. According to the embodiment of FIG. 1, the converter winding 116 is fed from the center point 113 of the half-bridge circuit 111 to 113. Starting from the converter winding 116 of the primary-side circuit 111 to 116 of the LLC circuit, the secondary-side circuit 118 to 127 is fed. For this purpose, the secondary-side circuit 118 to 127 has a converter winding 118, 119 (e.g. inductance, coil). According to the embodiment of FIG. 1, the secondary-side converter winding 118, 119 has two separate windings 118, 119. These are, for example, magnetically coupled 120. The secondary-side circuit 118 to 127 is fed according to the present embodiment by an electromagnetic coupling of the primary-side converter winding 116 and the secondary-side converter winding 118, 119 via a barrier 117, which is also referred to as a galvanic barrier. The center 120 of the secondary-side converter winding 118, 119 is coupled in FIG. 1 to an output 127 of the secondary-side circuit 118 to 127. The converter windings 116, 118, 119 and the barrier 117 form a transformer of the LLC circuit.
    Thus, energy (current / voltage) is from the supply voltage 110 via the half-bridge circuit 111 to 113 and converter winding 116 of the primary-side circuit 111 to 116 of the LLC circuit to the converter winding 118, 119 of the secondary-side circuit 118 to 127 of the LLC circuit transmitted and passed on to the outputs 127 of the secondary-side circuit 118 to 127, to which one or more lighting means 128 (eg LEDs) are connected. The one or more illuminants 128 (e.g. LEDs) are fed or supplied with the energy supplied to the outputs 127 of the secondary-side circuit 118 to 127. The control circuit 129 takes over the control of the energy transfer. For example, the control circuit 129 detects the voltage provided at the outputs 127 and / or conducted via the one or more lamps 128 and controls the switches 111, 112 of the half-bridge circuit 111 to 113 according to the detected voltage. The activation of the switches 111, 112 according to the detected voltage, which is conducted via the one or more lighting means 128, is generally known. Therefore it is not discussed further here.
    As far as the configuration of the secondary-side circuit 118 to 127 is concerned, the secondary-side circuit 118 to 127 according to the present embodiment also has diodes 121 and 122 and a capacitor 123 in addition to the converter winding 118, 119. According to the present embodiment, the diodes 121 and 122 form a rectifier and supply one or more lighting means 128 with direct voltage, with which the one or more lighting means 128 are operated. According to the present embodiment, the direct voltage provided by the rectifier diodes 121, 122 is smoothed by a capacitor 123 of the secondary-side circuit 118 to 127. The use of the capacitor 123 is optional.
    According to the embodiment of FIG. 1, the secondary-side circuit 118 to 127 has a first inductive element 124 (for example a coil) through which the output 127 of the secondary-side circuit 118 to 127 current is supplied and that between the diode 121 and the output 127 is arranged. Furthermore, the secondary-side circuit 118 to 127 has a second inductive element 125 (e.g. a coil) through which current is supplied to the output 127 of the secondary-side circuit 118 to 127 and which is arranged between one of the diode 122 and the output 127. Using either or both of the inductive elements 124, 125 is optional. In FIG. 1 there is a capacitor 126 between the outputs 127
    arranged. The use of the capacitor 126 is optional. The outputs 127 of the secondary-side circuit 118 to 127 are connected to the one or more lighting means 128. The energy flowing through the outputs 127 (i.e. current, voltage, in particular direct voltage) is fed to the one or more lighting means 128. The one or more light means 128 are then operated with the supplied energy.
    According to an embodiment of the present invention, the one or more lighting means 128 comprise one or more light-emitting diodes (LEDs). The LEDs 128 can be configured in various ways, and the present invention is not limited to any particular configuration of the LEDs 128. According to one embodiment, the LEDs 128 comprise inorganic and / or organic LEDs. The arrangement of the LEDs can also be designed in various ways. Thus, according to one embodiment, the LEDs 128 are connected in series, while according to a further embodiment, the LEDs 128 are connected in parallel. According to a further embodiment, the LEDs 128 are connected in more complex arrangements, for example in a plurality of series connections connected in parallel to one another. In Fig. 1, three light means 128, for example LEDs 128, are shown by way of example. The present invention, however, is not limited to this example and allows any number of lighting means 128, such as LEDs 128, to be used, i.e. using at least one lighting means 128 (e.g. at least one LED 128).
    It should be noted that the embodiment of the LLC circuit discussed above is an example and that other embodiments of the LLC circuit are also possible. The operation of the LLC circuit, in which current is fed from the primary-side circuit 111 to 116 to the secondary-side circuit 118 to 127 in order to supply the one or more illuminants 128, is also generally known to the person skilled in the art.
    As already explained above, the control circuit 129 is designed to adjust the dead time to: aNZU. The adaptation of the dead time to takes place, for example, as a function of a signal fed to the control circuit 129, which reflects the voltage via the one or more illuminants 128 (e.g. LEDs), and / or as a function of predetermined information on different illuminant voltages.
    The voltage across the one or more lighting means 128 (e.g. LEDs), which is fed to the control circuit 129 by means of the signal, can be detected directly or indirectly. Correspondingly, the signal fed to the control circuit 129 also reflects the voltage across the one or more lighting means 128 directly or indirectly.
    The voltage is recorded directly if it was measured on the one or more illuminants 128 and thus corresponds to a voltage measured directly on the one or more illuminants 128. The measurement of the voltage at one or more lighting means 128 is generally known, which is why this will not be discussed further here. For example, the voltage can be measured via a voltage divider, integrated into a signal, and fed to the control circuit 129 in the signal.
    A voltage is recorded indirectly if it was not measured directly on the one or more illuminants 128, but was derived, recorded and / or determined in some other way. The indirect detection of the voltage is well known and can be done in different ways. An exemplary implementation of an indirect detection of the voltage via one or more illuminants 128 includes, according to an embodiment, for example: coupling a coil that is designed to detect the voltage, ie a detection coil that detects the current supplied to the illuminants 128, to the converter winding 118 , 119 of the secondary-side circuit 118 to 127 of the LLC circuit; integrating the voltage sensed by the sensing coil into a signal; and feeding the signal of the control circuit 129 through the converter winding 118, 119 of the secondary-side circuit 118 to 127 and through the converter winding 117 of the primary-side circuit 111 to 116.
    To adapt the dead time to, the control circuit 129 carries out at least one of the following actions: Adapting the dead time tot In at least two stages and / or continuously depending on
    gig of the signal fed to the control circuit 129, which directly or indirectly reproduces the voltage across the one or more illuminants 128; Assigning the dead time two a predetermined value and reducing or increasing the dead time tor IM further course of the activation of the first and second switches 111, 112; Adaptation of the dead time as a function of at least two pieces of information on different lamp voltages and as a function of the signal fed to the control circuit 129, each of the at least two pieces of information having a first piece of information and a second piece of information, the first piece of information comprising a lamp voltage value or a lamp voltage range and the second piece of information includes a dead time to to be set for the lamp voltage value or for the lamp voltage range of the first specification.
    These three alternatives, which can be combined with one another in different ways, are presented in detail below.
    Fig. 3 shows steps for adjusting the dead time to in accordance with an embodiment of the present invention. The steps shown in FIG. 3 are carried out by the control circuit 129 according to the present embodiment. In FIG. 3, the dead time tw: is carried out in at least two stages and / or continuously as a function of the signal fed to the control circuit 129, which signal directly or indirectly reproduces the voltage across the one or more lighting means 128.
    In the first stage, the control circuit 129 sets the dead time to 31. The setting 31 of the dead time to takes place, for example, by assigning a suitable (e.g. predetermined or a calculated) value. The value with which the dead time to is set 31 can take place, for example, using one or more known methods for determining a dead time to to be used. In a second stage, the control circuit 129 adjusts the dead time tiot to 32. To this end, the control circuit 129 uses the signal supplied to it, which reproduces the voltage across the one or more illuminants 128.
    An exemplary adaptation 32 of the dead time twot looks according to one embodiment as follows. If, for example, the signal fed to the control circuit 129 reproduces a voltage which is lower than the voltage with respect to which the dead time tor set in stage 1 was set 31, the control circuit 129 increases the dead time tor during the adaptation 32. For example, outputs that to the control circuit 129, a voltage that is higher than the voltage with respect to which the dead time tw: set in stage 1 was set, the control circuit 129 reduces the dead time to when it is adapted 32.
    In step 33 (which can also be optionally present), the control circuit 129 checks 33 whether a further adaptation 32 of the dead time tot is necessary. The checking 33 is also carried out, for example, with regard to a signal currently or most recently supplied to the control circuit 129, which signals the voltage across the one or more illuminants 128. A further adjustment 32 is considered necessary, for example, if the voltage reproduced by the supplied signal does not correspond to the last voltage observed, with regard to which the adjustment 32 of the dead time to was last carried out (e.g. not equal to or approximately the value of the last voltage observed is the same or is not in a predetermined range around the last observed voltage). If further adaptation is necessary, step 32 is carried out again. If further adaptation is not necessary, it can later be checked again 33 whether further adaptation of the dead time tot is necessary.
    The checking 33 whether further adjustment is necessary and thus also the execution of the adjustment 32 of the dead time dead, If necessary, a predetermined number of times, at certain time intervals (eg periodically), continuously, at certain times, in response to certain events which, for example, indicate the need to adapt the dead time tiot and / or indicate or display changes in the voltage across the one or more illuminants 128, etc. take place.
    4 shows steps for adapting the dead time to according to a further embodiment
    of the present invention. The steps shown in FIG. 4 are carried out by the control circuit 129 according to the present embodiment.
    In Fig. 4, the control circuit 129 of the dead time to be used initially has a predetermined value to 41. In a further course of the control of the first and second switches 111, 112 by the control circuit 129, the control circuit 129 then checks 42 whether a further adjustment of the dead time tw: is necessary. This step of checking 42 is carried out, for example, in the same way as step 33 discussed above. If the control circuit 129 determines during the check 42 that a further adaptation is necessary, the control circuit 129 carries out an adaptation 43 of the dead time tor. The adaptation 43 is carried out, for example, as outlined above for the adaptation step 32.
    To check 33, 42 whether an adaptation 43 of the dead time to is necessary, the control circuit 129 according to a further embodiment, which can be combined with the embodiments described herein, uses one or more pieces of information on lamp voltages. If there is more than one piece of information on lamp voltages, it is a matter of different pieces of information that relate to different lamp voltages. This means that each of the information relates to a lamp voltage that is different from the lamp voltage of the other information. The control circuit 129 uses the one or more pieces of information on lamp voltages to adjust the dead time two :.
    The one or more pieces of information are specified according to the embodiment. The information is stored, for example, in a storage device or storage arrangement, and the control circuit 129 is configured to obtain the one or more pieces of information from the storage device or from the storage arrangement.
    [0063] FIG. 5a shows an exemplary embodiment of information 50 relating to a lamp voltage according to an embodiment of the present invention.
    According to the embodiment of FIG. 5a, the information on a lamp voltage comprises at least two items of information. In FIG. 5 a, the information on a lamp voltage has, for example, a first item 501 and a second item 502. The first indication 501 comprises a lamp voltage value or a lamp voltage range. The second specification includes a dead time that is to be set with regard to the lamp voltage value or the lamp voltage range of the first specification 501.
    If, for example, a signal currently / last supplied to the control circuit 129 reproduces a voltage across the one or more lamps 128 which is equal to the lamp voltage value of the first item 501 of the information 50 or which is in a lamp voltage range of the first item 501 of the information 50 is, the control circuit 129 sets the dead time tot to the dead time tor (for example in at least one of the steps 31, 32, 41, 43 discussed above), which is specified in the second item 502 of the information 50.
    In this way, the above-described adaptations 32, 43 can also be made by the control circuit 129.
    If several items of information 50 are available, the control circuit 129 searches for information 50, the first item of which 501 has a lamp voltage value which is the same as the voltage across the one or more lamps 128, or whose first item 501 has a lamp voltage range, which includes the voltage across the one or more illuminants 128 if the voltage value specification 501 of the respective information 50 is a range.
    If the control circuit 129 has found the information 50 sought, the control circuit 129 sets 31, 32, 41, 43 the dead time tw: to the dead time tw (for example in at least one of the steps 31, 32, 41, 43 discussed above) , which is indicated in the second indication 502 of the information 50 found.
    If the voltage across the one or more illuminants 128 is not one of the illuminant voltage values of the voltage value specifications 501 of the one or more information
    nen 50 and if the voltage across the one or more illuminants 128 is not included in any of the illuminant voltage ranges of the voltage value information 501 of the one or more information 50, the control circuit 129 searches for the information 50 whose voltage value information 501 the voltage across the one or more which is closest to the plurality of illuminants 128. That is, the control circuit 129 searches for information 50 whose lamp voltage value in the first indication (or in its voltage value indication) 501 is approximately the same as the voltage across the one or more lamps 128 or under all other information about the voltage across the one or more Illuminants 128 is closest or whose illuminant voltage range in the first specification (or in its voltage value specification) 501 is closest to the voltage across the one or more illuminants 128.
    If the control circuit 129 has found the information 50 sought, the control circuit 129 sets the dead time tw: 31, 32, 41, 43 to the dead time tw (for example in at least one of the steps 31, 32, 41, 43 discussed above) , which is indicated in the second indication 502 of the information 50 found.
    The two searches set out above, i.e. the exact search and the approximate search, are implemented according to a further embodiment within a single search process.
    As already mentioned, each of the items of information 50 in the first information 501 preferably indicates voltage values / ranges which are different from those of the other items of information 50. That is to say, the first details 501 of the various items of information 50 indicate voltage values and / or voltage ranges which are not the same as one another or which do not overlap.
    In one example, a first item 501 of information 50 indicates, for example, a voltage value of 40 V and a second item 502 of information 50 indicates a dead time of 1.70E-06 seconds. If a signal fed to the control circuit 129 indicates a voltage across the one or more illuminants 128 which is equal to or approximately equal to 40 V, the dead time tot is adjusted 31, 32 by the control circuit 129 to 1.70E-06 seconds , 41, 43, if the information 50 on different lamp voltages is used in order to make the respective setting / adaptation 31, 32, 41, 43.
    The one or more pieces of information 50 can be combined, stored and / or made available to the control circuit 129 in various ways. According to some embodiments, the one or more pieces of information 50 on lamp voltages are stored in a table, in an array or in another structure that enables the information 50 to be quickly searched for their lamp voltage values and / or lamp voltage ranges in their first information 501. According to at least some of these embodiments, the first indication 501 is used as a search value or a search field.
    5b shows an exemplary embodiment of a table 5, for example a look-up table or a hash table, according to an embodiment of the present invention, the table 5 having one or more pieces of information 50 on different lamp voltages. In FIG. 5b, the table includes, for example, n items of information 50_1, 50_2,..., 50_n relating to lamp voltages, where n is a positive integer. Each of the information items 50_1, 50_2, ..., 50_n is configured like the information item 50 discussed above.
    The first details 501 of the lamp voltage information 50_1, 50_2,..., 50_n, which each specify a lamp voltage value or a lamp voltage range, are used as search fields or search indices 51. When searching for the information 50_1,50_2,..., 50_n, only the respective first information 501 is searched and compared with the voltage across the one or more illuminants 128. The implementation of the first information 501 as search fields or search indexes 51 enables the lamp voltage information 50_1, 50_2,..., 50_n to be found quickly and efficiently, the second information 502 of which indicates the dead time to
    Voltage across the one or more illuminants 128 is to be set.
    The following table (e.g. look-up table or hash table) shows exemplary values of possible information 50, 50_1, 50_2, ..., 50_n on lamp voltages:
    501 502 (voltage (in volts)) (dead time to be set dead (in seconds))
    40 1.70E-06
    50 1.40E-06
    60 1.20E-06
    70 1.00E-06
    80 8.60E-07
    90 7.85E-07
    100 7.15E-07
    110 6.65E-07
    120 6.35E-07
    130 6.15E-07
    140 6.10E-07
    When searching for information 50_1, 502,..., 50_n, the lamp voltage value or lamp voltage range of which corresponds to the voltage across the one or more lamps 128, only the first details 501 of the stored information 50_1, 50_2,. .., 50_n searched. If the first details 501 are designed as indices or look-up fields, a quick and efficient search is made possible.
    Figure 6 illustrates steps for adjusting the dead time gate in accordance with an embodiment of the present invention. The steps are carried out by the control circuit 129.
    First, the control circuit 129 evaluates the signal supplied to it from 61, which reproduces the voltage of one or more illuminants 128, and the information 50, 50_1, 50_2,..., 50_n on various illuminant voltages. In this step of the evaluation 61, a search is carried out for the information 50, 50_1, 50_2,..., 50_n whose lamp voltage value or lamp voltage range corresponds to the voltage reproduced by the supplied signal. For example, the search is carried out as discussed above.
    Was the information 50, 50_1, 50_2, ..., 50_n and the supplied signal, which reproduces the voltage of the one or more illuminants 128, evaluated, that is, a corresponding information 50, 50_1, 50_2, ... , 50_n is found, the dead time to is correspondingly adapted 62 by the control circuit 129. That is to say, the control circuit 129 sets the dead time tot, which will be used to switch the switches 111, 112, to the dead time that is found in the second item 502 of the Information 50, 50_1, 50_2, ..., 50_n is specified.
    The information 50, 50_1, 50_2, ..., 50_n are given, for example, in a table 5, and the search 62 for a corresponding information 50, 50_1, 50_2, ..., 50_n is, for example, via the respective first information 501 made as search fields or search indices 51.
    The steps of FIG. 6 can be implemented as part of each of the above-mentioned steps 31, 32, 41, 43.
    Thus, according to the present invention, the dead time to is set flexibly and depending on the situation. The set dead time tw is then used to switch switches 111, 112 accordingly. The control circuit 128 is designed to flexibly adapt the dead time. When switched by the control circuit 129, the two switches 111, 112 are then left off by the control circuit 129 only until the last set / adapted dead time tor has expired.
    The invention thus relates to a control circuit 129 which is designed to control a first switch 111 and a second switch 112 of a half-bridge circuit 111 to 113 of an LLC circuit for operating one or more illuminants 128, the control circuit 129 having a dead time between switching off the first Switch 111 and turning on the second switch 112 and between turning on the first switch 111 and turning off the second switch 112 adjusts. The invention also relates to an operating device 1 which has the control circuit 129.
    LIST OF REFERENCE CHARACTERS
    1 control gear
    110 input voltage / supply voltage 111 first switch
    112 second switch
    113 midpoint
    114 inductance
    115 capacity
    116 primary-side transformer winding
    117 barrier
    118 secondary-side transformer winding
    119 secondary-side transformer winding
    120 Middle of the secondary converter winding 121 Diode
    122 diode
    123 capacity
    124 inductive element
    125 inductive element
    126 capacitor
    128 one or more lamps
    129 control circuit
    31 Setting the dead time
    32 Adjusting the dead time
    33 Check the need for further adjustment of the dead time. 41 Set the dead time
    42 Check the need for further adjustment of the dead time. 43 Adjust the dead time
    50 Information on a lamp voltage 501 first information
    502 second statement
    50_1 Information on a lamp voltage 50_2 Information on a lamp voltage 50_n Information on a lamp voltage 51 Search field or search index
    61 Evaluation
    62 Adjusting the dead time
    权利要求:
    Claims (10)
    [1]
    1. Control circuit, the control circuit being designed:
    - To control a first switch and a second switch of a half-bridge circuit of an LLC circuit for operating one or more lighting means, the first switch and the second switch being connected in series, the control circuit being designed to control the first switch and the second switch in such a way that there is a dead time between switching off the first switch and switching on the second switch and between switching on the first switch and switching off the second switch,
    characterized in that
    the control circuit is designed to carry out at least one of the following actions:
    - to adapt the dead time in at least two stages and / or continuously depending on a signal fed to the control circuit, the signal fed to the control circuit directly or indirectly reproducing the voltage across the one or more illuminants;
    to assign a predetermined value to the dead time and to reduce or increase the dead time in the further course of the activation of the first and the second switch;
    - to adapt the dead time as a function of one or more pieces of information on lamp voltages and as a function of the signal fed to the control circuit, each of the one or more pieces of information having a first indication and a second indication, the first indication comprising a lamp voltage value or a lamp voltage range and the second Specification includes a dead time to be set for the illuminant voltage value or for the illuminant voltage range of the first specification.
    [2]
    2. Control circuit according to claim 1, characterized in that reducing the dead time or increasing the dead time is event-dependent and / or time-dependent.
    [3]
    3. Control circuit according to claim 1 or 2,
    characterized in that
    the control circuit is designed:
    - to compare the voltage, which is reproduced by the supplied signal, with the lamp voltage value or with the lamp voltage range of the first item of information of the one or more items of information on lamp voltages; and
    - to set the dead time to the dead time to be set for the second item of information when the voltage that is reproduced by the supplied signal is equal to or approximately the same as the lamp voltage value of the first item of information or is in the lamp voltage range of the first item of information.
    [4]
    4. Control circuit according to one of the preceding claims, characterized in that the one or more pieces of information are stored in a table and the control circuit is designed to take the one or more pieces of information from the table.
    [5]
    5. Control circuit according to claim 5, characterized in that the table is a look-up table or a hash table.
    [6]
    6. Control circuit according to one of the preceding claims, characterized in that the supplied signal directly reproduces the voltage across the one or more illuminants when the voltage across the one or more illuminants is applied directly to the
    one or more illuminants was measured, and wherein the supplied signal indirectly reproduces the voltage across the one or more illuminants if the voltage was detected across at least one component of the LLC circuit and not measured on the one or more illuminants has been.
    [7]
    7. Control circuit according to one of the preceding claims, characterized in that the control circuit is designed to receive the supplied signal from a detection coil on a secondary side of the LLC circuit.
    [8]
    8. Operating device, in particular a converter, for operating one or more illuminants, wherein the operating device is designed to operate one or more illuminants, and wherein the operating device has a control circuit, characterized in that the control circuit is designed according to one of the preceding claims.
    [9]
    9. Operating device according to claim 8, wherein the operating device has the LLC circuit, which has the half-bridge circuit with the first switch and with the second switch, wherein the first switch and the second switch are connected in series and the control circuit is configured, the first To control the switch and the second switch, characterized in that when the first switch and the second switch are controlled, the dead time is adapted by the control circuit.
    [10]
    10. Operating device according to claim 9, characterized in that the LLC circuit has at least one component which is designed to detect the voltage via the one or more lighting means, the signal to be supplied to the control circuit by integrating the detected voltage into the signal to generate and to supply the generated signal to the control circuit.
    In addition 6 sheets of drawings
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    同族专利:
    公开号 | 公开日
    DE202016106926U1|2018-03-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US20130200707A1|2010-04-09|2013-08-08|Tridonic Ag|Modular LED Lighting Having an Emergency Light Function|
    DE102011078579A1|2011-07-04|2013-01-10|Robert Bosch Gmbh|Drive circuit and method for driving the input switching stage of a transformer circuit|
    US20150357915A1|2014-06-09|2015-12-10|Samsung Electronics Co., Ltd.|Driving circuit, voltage converter having adaptive dead time control function and method of controlling dead time|
    US20160198532A1|2015-01-06|2016-07-07|Panasonic Intellectual Property Management Co., Ltd.|Lighting device and lighting fixture using same|
    GB201204787D0|2012-03-19|2012-05-02|Tridonic Uk Ltd|Lamp unit power supply system|
    US9307623B1|2013-07-18|2016-04-05|Universal Lighting Technologies, Inc.|Method to control striations in a lamp powered by an electronic ballast|
    WO2016026090A1|2014-08-19|2016-02-25|Abbeydorney Holdings Ltd.|Driving circuit, lighting device and method of reducing power dissipation|EP3907871A1|2020-05-05|2021-11-10|Tridonic GmbH & Co. KG|Resonant half-bridge converter with adaptive dead-time|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE202016106926.2U|DE202016106926U1|2016-12-13|2016-12-13|Adjust the dead time of an LLC circuit|
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