• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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  • 优先权
    • 专利摘要:
    It is proposed a method for operating an LED route from a controlled by a control unit (80) switching regulator (81) for generating a current for the LED track, wherein the switching regulator (81) for a constant operation of the LED track with preferably constant current is configured, wherein for dimming the LED path of the switching regulator (81) is supplied on the input side with such a current that the functionality of the switching regulator (81) is turned off.
    公开号:AT15534U1
    申请号:TGM9010/2014U
    申请日:2014-04-28
    公开日:2017-12-15
    发明作者:Jermyn Phillip
    申请人:Tridonic Gmbh & Co Kg；
    IPC主号:
    专利说明:

    description
    OPERATING CIRCUIT FOR LEDS
    The present invention relates to a circuit and to a method for operating lamps, in particular light-emitting diodes (LEDs) by means of, for example, switching regulators for providing an operating current or an operating voltage for the LEDs. More particularly, the invention relates to circuits or converter modules that enable dimmable operation of LEDs that are dimmable by a phase dimmer (triac). Triacs are still widely used as an incandescent dimming infrastructure.
    In principle, it is already known to use switching regulators such as buck converter for driving a LED having the LED track. In this case, a control unit controls a clocked semiconductor power switch, by means of which a coil is magnetized in its on state. The energy built up in the coil is discharged via the LED path when the switch is switched off.
    Typically, such buck converters are operated so that the current supplied to the LED track is regulated to a constant value.
    Dimming the LED track is therefore not achievable.
    Therefore, an object of the invention is to provide a circuit which enables dimming of an LED track, especially in the case of an LED track formed by e.g. a down-converter is operated, e.g. in the case of a LED retrofit lamp.
    This problem is solved according to the independent claims. Further aspects of the invention are dealt with in the dependent claims.
    [0007] In a first aspect, the invention proposes a method for operating an LED route from a switching controller controlled by a control unit to generate a current for the LED route. The switching regulator is designed for a constant operation of the LED path with preferably constant current.
    For dimming the LED track, the switching regulator is supplied on the input side with such a current that the functionality of the switching regulator is turned off.
    Preferably, the dimming of the LED path of the supply current for the switching regulator is reduced until this supply current is no longer sufficient to operate the switching regulator such that the current for the LED route remains constant.
    Preferably, the switching regulator is designed for a constant operation of the LED track such that the current through the LED track is kept constant as long as the switching regulator receives sufficient power at its input.
    In a further aspect, the invention proposes a circuit for operating an LED track, comprising a controlled by a control unit switching regulator for a constant operation of the LED track with preferably constant current. The circuit includes a converter for providing a supply current to the switching regulator. To dim the LED path, the converter supplies the switching regulator (81) with such a supply current that the functionality of the switching regulator is switched off.
    Preferably, the dimming of the LED path of the converter made available supply current is reduced until this supply current is no longer sufficient to operate the switching regulator such that the current for the LED route remains constant.
    Preferably, the switching regulator is designed for a constant operation of the LED track such that the current through the LED track is kept constant, as long as the switching regulator at its input enough power, in particular above a threshold receives.
    If the functionality of the switching regulator is switched off, the LED path is preferably dimmed by the converter changing or reducing the supply current accordingly.
    Preferably, the control unit is adapted to ensure a constant operation with preferably a constant current of the LED track.
    Preferably, the switching regulator has a serving as an energy storage coil and a switch for demagnetization and demagnetization of the coil. The functionality of the switching regulator is switched off in such a way that the switch no longer upsets and demagnetizes the coil.
    Preferably, the switching regulator is designed as a step-down converter.
    Preferably, the circuit has a voltage limiting circuit for limiting the supply voltage provided for the switching regulator.
    If the supply voltage is too high, the voltage limiting circuit preferably ensures that an electrical parameter of the converter is reduced or that a measurement of an electrical parameter of the converter is falsified.
    Preferably, the converter is configured in the form of a flyback converter. Preferably, the electrical characteristic of the converter is the current through the primary winding of the converter.
    Preferably, the voltage limiting circuit comprises a Zener diode, which is arranged at the output of the converter.
    Preferably, the voltage limiting circuit in series with the Zener diode comprises an optical transmitter of an opto-coupler. With a conductive Zener diode, the optical receiver of the optocoupler ensures that a measurement of an electrical parameter of the converter is falsified.
    Preferably, the switching regulator and the LED track are arranged in a LED retrofit lamp.
    The invention may be particularly applicable in the field of so-called retrofit LED lamps, which may be substituted for e.g. used by incandescent or halogen lamps.
    Retrofit lamps accordingly have connection pedestals with which they are incorporated in known lamp sockets, e.g. screwed or plugged, can be.
    These aspects relate both to a method according to the invention and to a circuit according to the invention.
    The invention provides that is switched by means of a converter or a drive circuit for dimming in a constant current mode, and more specifically the power supply for the buck converter is reduced until the product of the 12 volt supply and the power provided is more sufficient to operate the buck converter so that the LED track is constantly supplied. Thus, when operating below a predetermined current threshold, the buck converter operation is interrupted and the buck converter switch is turned on continuously. As soon as this measure, i. E. In particular, by greatly reducing the power supply, the functionality of the buck converter is off, the LED link behaves as if it were essentially directly, i. without down converter, connected to the 12 volt terminals of the converter. By correspondingly changing the power supply, the LED track can then be dimmed.
    The invention is therefore that LED retrofit lamps, which have a down converter for a constant operation of the LED track, the input side are supplied with such a current, which turns off the functionality of the buck converter, that the connected MR16 lamp behaves as if the LED track would be operated directly on the terminals.
    Further aspects of the invention will be explained below with reference to the drawings. In particular, FIG. 1 illustrates an example dimmer driver based on fixed output PFC control; FIG. FIG. 2 shows an exemplary input current waveform; FIG. FIG. 3 shows an exemplary power factor corrected buck converter; FIG. FIG. 4 shows an existing PFC model; FIG. FIG. 5 shows an exemplary fixed output driver with PFC; FIG. Fig. 6 shows by way of example a modification of the circuit according to the invention; Fig. 7 shows a detailed representation of a portion of the circuit shown in Fig. 6; Fig. 8 shows an operating circuit for LEDs e.g. for a LED retrofit lamp.
    Single-stage fixed output power blocking driver (IC) units with built-in power factor correction are known, but it will be appreciated that this type of controller can be used for a simple and elegant dimming solution with very good performance, as described below.
    The invention is particularly aimed at providing smooth and flicker-free dimming which can be achieved in conjunction with most dimmers, whereby the amount of parts and material lists can be reduced and which can function simultaneously with different ICs. In addition, no high-voltage electrolytic capacitor must be present.
    For this purpose, the circuit present in the converter module for controlling the at least one LED can provide a power factor correction (PFC) function, e.g. In particular, the invention uses the high power factor of a PFC circuit When a flyback converter is used, the current / voltage on the secondary side of the flyback converter driving the at least one LED mirrors, reflected by phase angle or phase section at the input of the primary side of the converter dimming reflected.
    In this case, there is the problem that the PFC circuit sometimes does not receive enough power that the used for Phasenanschnitts- or phase portion dimming (triac) dimmer required as holding current. Bleed circuits are known to remedy this symptom and to ensure the required holding current through their power loss. Usually, these bleed circuits are formed as tracks, which can be selectively operated or interrupted.
    The problem can be solved by using only passive components for producing the bleed circuits, and in particular an ohmic resistor R10 and a capacitor C10 as shown in the exemplary LED actuator circuit shown in FIG.
    Furthermore, two additional ohmic resistors R1, R9 are connected to the input lines of the circuit, which are referred to as current / phase wire and zero line in Fig. 1, which is advantageous for the damping of the sound at the input of the circuit by an interaction of the phase control / triac dimmer with inductive identifier and a PFC circuit with capacitive switch is generated.
    Fig. 1 shows an arrangement with additional passive components for attenuating a ringer R1, R9 of the radio interference suppression (RFI) of the dimmer with switching capacity. This in turn ensures even, flicker-free dimming. Thus, Fig. 1 shows a circuit for a converter module with a fixed output power PFC controller. The PFC function circuit is replaced by the use of a circuit integrated in the control unit, e.g. the flyback converter driver, realized with an integrated switch.
    The components circled in Figure 1 represent the additional components for attenuating the blade R1, R9 and for making the passive bleeding R10, C10. However, the circuit shows very little complexity of the converter even using the latest fixed output power controllers ,
    Furthermore, an auxiliary winding is provided, which is inductively coupled to the converter and in which current / voltage is generated in dependence on the mains voltage of the LED actuator. This generated voltage is supplied to the control unit as a negative current / voltage. The generated voltage also indicates the current / voltage through a shunt resistor connected in series with a switch built into the control unit. The turn-off threshold is adaptively changed by the control unit, i. depending on the current state of the mains voltage, resulting in the PFC function.
    To simplify dimmer operations in response to a leading phase angle of the mains voltage, a feedback signal is fed back from a detection device, for example an auxiliary winding AUX of the converter, to the control unit. In particular, the current through the detection means is measured to determine the current in the converter, preferably the current through the primary side of a flyback converter. As a result, the control unit directly or indirectly determines the current / voltage, for example through the primary side of the flyback converter. This determined current / voltage represents the signal fed back to the control unit. The control unit may be an IC, AS IC or a microcontroller.
    If the converter is designed for example as a flyback converter, the circuit of the converter module can provide an energy store (capacitor) on the secondary side of the converter, wherein the flyback converter provides an inductive separation between arranged on the primary side of the components and arranged on the secondary side components , The auxiliary winding as shown for example in Fig. 5 can also be located on the secondary side.
    A flyback converter with a constant turn-on time (tone) could realize the PFC function even without a feedback supplied to the driver IC from the auxiliary winding.
    However, the power factor would not be so good. An example of a control unit used is the HVLED805 from ST Microelectronics.
    A single stage, power factor corrected controller may also include a small DC bus capacitor in the range of about 100nF. Therefore, a flyback converter receives as its input non-smoothed, rectified mains half-cycles that may drop to OV.
    The use of such an integrated driver circuit (IC) allows excellent dimming performance with most so-called leading or trailing edge (rising or falling) dimmers. The circuit usually fits on a single-sided board and, as the process works with virtually any fixed PFC controller, the designs can be easily adapted to applications that use the latest low-cost IC.
    While in Fig. 1, a possible output ripple is controlled only by an output capacitor, the simple structure of the circuits also leaves room for a large capacitor, with which the ripple under 40% to 60%, in particular 50%, can be maintained.
    As a control factor, the controller generates current / voltage which is used to change the current of the flyback converter on its primary input side. In particular, a dimming operation depends on the phase gating when the peak current, namely, the current at the flyback switch is changed, and the peak current is controlled so that it is in principle proportional to the amplitude of the present input voltage.
    Consequently, depending on the phase angle, a current characteristic could be generated, as shown by way of example in FIG. 2.
    It should be noted that the converter module circuit can also be used with other converters, e.g. Down converter structures. In addition, the control unit may have a power factor correction (PFC), but this is not mandatory. However, an improvement in the power factor of the converter module circuit is desirable, and therefore, a method for applying a power factor correction in any control unit will be described below, particularly for control units having an external peak current measuring resistor.
    In particular, if a control unit is used only with source input (e.g., NXP SSL21083 having only one source input to HVLED815, for example) to determine a current / voltage on the shunt resistor, another approach may be used. In Fig. 3, such a control unit is shown in a configuration with a buck converter.
    At the source input of the control unit shown in Fig. 3, a relatively low impedance of e.g. about 1 to 5 Ω, preferably 2.7 Ω, connected. If a relatively high negative current / negative voltage were detected by the detector at this input, the power loss would be unduly high.
    Thus, the power loss is limited by the voltage at the detection device is significantly reduced. This is achieved by reducing the turns of, for example, the auxiliary winding to only a few turns, for example 1 to 5 turns, in particular approximately two turns. As a result, the current / voltage at the detector can be reduced, and even at a lower impedance, the power loss can be reduced.
    Specifically, the control unit includes a control system having a current sense resistor for measuring a peak inductor current in the time when the main switch is turned on.
    In a device without PFC, the switch is generally turned off when the voltage drop across the voltage measuring resistor reaches a predetermined value. The peak current flowing through the inductor represents a known amount of energy, and this, in conjunction with a known switching frequency, forms the basis for power output control or current control.
    The power factor associated with such a model tends to be poor, even if a mass storage capacitor is small. This is because the on-time can be relatively long when the mains voltage is low (during mains current values). The reason for this is that the inductor current takes longer to reach the required peak value. Consequently, the average input current is high during these times and low during the mains voltage spikes. This is exactly the opposite of the current waveform required for a high power factor.
    To correct this, the detector may be added to the throttle. This is to provide a negative current / voltage while the main switch is turned on. This current / voltage is then applied to the CS input of the current sensor of the control unit via a second resistor. In Fig. 3, an example is shown in which the method has been applied to a cost-effective buck converter. Thus, Figure 3 shows a power factor corrected buck converter.
    The negative current / voltage provided by the auxiliary winding varies depending on the instantaneous line voltage. When the main switch is turned on, a current flows through the resistor R3, and due to the changing negative current / voltage, the current / voltage is increased when the input current / voltage has reached its peak, and is greatly reduced in mains voltage valleys. The currents through resistor R3 conduct current away from sensing resistor R4 and thus increase the final peak current by an amount that depends on the input voltage at that time. The result is an input current that is largely constant over most of each half cycle of the line voltage, thus providing a greatly improved power factor.
    Again, the resulting typical current waveform is shown in Fig. 2, in this case a typical input power waveform with power factor correction.
    However, existing applications require that the current sense input of the controller be disconnected from the actual current carrying terminal, as illustrated in FIG. 4, which is a typical example of an existing PFC model.
    In Fig. 1, the measuring resistor R5 is not directly connected to the CS input of the current measurement of the control unit. Instead, the wire resistor R7 is connected. Thus, the impedance is sufficiently increased that the method can operate using the normal auxiliary winding present in a typical flyback converter.
    By providing a separate winding, as shown in Figure 3, with a small number of turns, the method can be generalized to work with any driver IC having an external current sense resistor.
    This solution is particularly suitable for down converter applications because the turns of the auxiliary winding can be easily wound around a normal drum inductor. In summary, the structure illustrated in FIG. 3 shows a very inexpensive and widely applicable power factor correction method that provides power factors of 80% to 90%, more specifically, about 85%, and a total harmonic distortion (THD) of about 25-45%, especially 30% to 40%. This structure can also be easily adapted to control units and can also be combined with the structure of Fig. 1.
    Another example of an inventive circuit is shown in Fig. 5, which shows a circuit diagram for a modified PFC model. While power factor correction can be achieved in a number of ways, one common method is to supply the control unit's peak current detection circuit with a contribution from detection means via an external resistor, as indicated above.
    While the switching transistor of the converter is turned on, the output from the detector is negative and proportional to the mains input voltage at that time. The supply from the detector causes the peak current reached by the primary winding to be increased by an amount proportional to the instantaneous line voltage. The contribution to the peak current actually dominates with the result that the power consumed by the converter becomes approximately sinusoidal and provides a high power factor.
    In summary, the wiring to the control unit is changed to compensate for variations or variations in the mains voltage which lead to changes in the light output emitted by the at least one LED.
    For this reason, a Zener diode shown in Fig. 5 is provided in the feedback path from the detection means to the converter to the control unit to clamp the negative current / negative voltage fed back to the control unit to a maximum and / or predetermined value , Above this value, the voltage remains disconnected and thus constant and changes or fluctuations outside the clamping range are disregarded. Instead of a Zener diode, the clamping can also be simplified by built-in devices of the control unit and / or the software of the control unit.
    This improves the control characteristics with respect to stability of the output current / voltage of the converter, taking into account a slight decrease of the power factor as described below.
    A disadvantage of the method described can be seen in the fact that the converter output is dependent on the mains voltage. The output control is poor in terms of the variations in the input voltage. However, this can be improved by a control with only a minimal degradation of the power factor as set forth below.
    As shown in Fig. 5, the original PFC was achieved by the resistor R8, which was connected directly between the auxiliary winding and the current measuring input of the control unit and the high-voltage side of the resistor R7. Fig. 5 now shows some additional components in the illustrated box. In particular, a shunt reference U2 of the control unit (e.g., 2.5V) clamps the voltage on the low voltage side of resistor R8 to a maximum magnitude of negative voltage, e.g. 1 to 5 V, in particular 2.5 V negative. This voltage is then applied to the current sense input of the driver IC via resistor R27.
    The power factor correction is still present, but the maximum amount is limited by the claimed voltage. Thus, increases in the mains voltage can not further increase the maximum peak current.
    In conjunction with FIGS. 6 to 8, a further circuit construction is shown, which is particularly suitable for the operation of LED retrofit lamps.
    Fig. 6 shows a modified circuit construction of a converter 60 for LEDs. This circuit construction is based on the variants described above. Shown is a converter in the form of a flyback converter or flyback converter. FIG. 7 shows a detailed illustration of a portion of the converter shown in FIG. 6.
    FIG. 8 shows a typical structure of an operating circuit 82 for LEDs and in particular a MR16 LED retrofit lamp. Such LED retrofit lamps are typically powered by a 12 volt supply and have a connection socket (not shown) that can be incorporated into a corresponding socket for halogen MR16 lamps.
    Such an LED retrofit lamp typically comprises an input side bridge circuit NT consisting of four diodes for rectifying an AC voltage, e.g. a mains voltage. A capacitor CT is connected downstream of the bridge circuit NT. The circuit of FIG. 8 further comprises a switching regulator, in which the power supply of the LED track is ensured by means of at least one periodically operating electronic switch QT and at least one energy storage device.
    In the embodiment of Fig. 8, the switching regulator is designed as a buck converter 81 or Buck converter, alternatively the switching regulator is also designed e.g. could be configured as a boost converter or boost converter. The rectified voltage is applied to a series circuit consisting of the LED track, the energy store in the form of a coil LT and the switch QT preferably in the form of a semiconductor circuit breaker such. of a MOS-FET.
    The LED track comprises three LEDs connected in series. Alternatively, the LEDs may also be connected in parallel or according to a serial and parallel arrangement. The LEDs can be OLEDs. Furthermore, it may be, for example, monochromatic LEDs, color-converted white LEDs and / or RGB LED modules. A freewheeling diode DT is arranged parallel to the LED track and coil LT. In parallel to the LED path, a capacitor C2 'is connected.
    In the on state of the switch QT, a current flows through the LED path and the coil LT. During this switch-on phase, the current thus increases through the coil LT. During a subsequent freewheeling phase, i. In the switched-off state of the switch QT, the energy stored in the coil LT discharges in the form of a current through the LED.
    Route.
    It is a control circuit 80 is provided which controls the switch Q1 'high-frequency or as the manipulated variable of the regulation of the LED power and the LED current, the timing of the switch Q1' pretends. The control circuit 80 may be configured as a control and / or regulating circuit, in particular in order to keep the current constant through the LED path.
    For performing the current control, e.g. be provided between the switch Q1 'and ground a measuring resistor for detecting the current through the coil LT. Alternatively or additionally, e.g. in the freewheeling path consisting of the diode DT, the LED track and the coil LT another measuring device, such. a measuring resistor, be provided for measuring the current through the coil LT.
    As long as the buck converter 81 receives sufficient power at its input, it keeps the current through the LED path constant. Accordingly, no dimming can take place.
    Therefore, the invention provides that the LED track can be dimmed by means of the converter 60. For this purpose, the operating circuit 82 is connected to the output A of the converter 60. At output A, a 12 volt supply for circuit 82 is provided.
    The in Figs. 6, 7 illustrated flyback converter is based on an inductance in the form of a primary winding L3, which is connected in series with a switch 71. The switch 71 is preferably controlled by the control unit 70 according to the above embodiments. In the embodiment of Figs. 6, 7, the switch 71 is part of the control unit 70. Alternatively, the switch 71 may also be arranged outside the control unit 70.
    The primary winding L3 is connected to the terminal D of the control unit 70. In series with the primary winding L3 and the switch 71, a measuring resistor R11 is provided. Preferably, the sense resistor R11 is disposed between the switch 71 and ground. The current sense terminal CS of the control unit 70 is used to return a signal that supplies the current through the converter 60, i.e., the signal S0. the current through the primary winding L3 and through the switch 71 reproduces. A resistor is provided between the terminal CS and the center between the switch 71 and the sense resistor R11, respectively.
    The flyback converter or the switch 71 can then be operated in such a way that it is regulated to a desired primary-side current. The flyback converter can be operated by the control unit 71 in accordance with the above embodiments.
    The control unit 70 is, for example, an LED driver HV LED 815 from ST Microelectronics as a control IC, which is designed as a dimmable driver for LED retrofit lamps.
    As already explained, the control unit 80 together with the down converter 81 tries to keep the current constant through the LED path, so that no dimming can take place.
    Therefore, the invention provides that the converter 60 is switched to a constant current mode for dimming. More specifically, the power supply to the buck converter 81 is reduced until the product of the 12 volt supply and the power provided is no longer sufficient to drive the buck converter 81 to continue providing the LED path.
    Thus, when the buck converter 81 is operated below a predetermined current threshold value, the operation of the buck converter 81 is interrupted and the switch QT of the buck converter 81 is turned on continuously, it is continuously turned on.
    [0096] As soon as the functionality of the buck converter 81 is turned off by this measure (strong reduction of the power supply), the LED path behaves as if it were substantially directly, i. without down converter 81, would be connected to the 12 volt terminals A. By changing the power supply, the LED track can be dimmed.
    In the converter 60 and in the supply circuit of Fig. 6, a voltage limiting circuit 61 is shown. The voltage limiting circuit 61 is preferably provided for the secondary side of the converter 60, on the other hand, as the supply of current to the load is reduced, the secondary side voltage, in particular the secondary side voltage at the output A, would increase.
    The voltage limiting circuit 61 comprises a series circuit connected between the terminals of the output A of a Zener diode Z3, a resistor R29 and an optical transmitter 62 of an optocoupler. The optical receiver 63 of the optocoupler is connected between a supply terminal VCC of the control unit 70 and the current detection terminal CS.
    When not dimming, i. E. when the dimmer is set to maximum brightness, the output current of the converter 60 is more than sufficient to drive the LED path. Thus, the output voltage at the output A will begin to increase until the zener diode Z3 becomes conductive. As soon as the Zener diode Z3 becomes conductive, the optical transmitter 62 of the optocoupler is activated. As a result, the optical receiver 63 of the optocoupler connects the supply terminal VCC to the current detection terminal CS.
    As a result, the voltage at the current detection terminal CS increases. This is interpreted by the controller 70 as if the current through the switch 71 and through the primary winding were too high. The control unit 70 responds accordingly and reduces the current through the primary winding by appropriate control of the switch 71. Ultimately, this feedback through the voltage limiting circuit 61 causes the output voltage at the output λ to be limited to approximately 12V. For this, e.g. the zener diode has a zener voltage of 11V.
    This feedback is advantageous in that the converter or IC is still operated normally, in which a high power factor correction can be maintained. The behavior of the triac dimmer remains stable. The solution according to the invention is also an inexpensive way of dimming e.g. a LED retrofit lamp. As a converter, a flyback converter can be provided, but also alternative topologies can be used.
    权利要求:
    Claims (10)
    [1]
    claims
    A method of operating an LED path from a switching controller (81) controlled by a control unit (80) to generate a current for the LED path, the switching regulator (81) for a constant operation of the LED path with preferably constant Power is configured, wherein for dimming the LED path of the switching regulator (81) is supplied on the input side with such a current that the functionality of the switching regulator (81) is turned off.
    [2]
    2. The method of claim 1, wherein for dimming the LED path of the supply current for the switching regulator (81) is reduced until this supply current is no longer sufficient to operate the switching regulator (81) such that the current for the LED track remains constant.
    [3]
    3. The method of claim 1 or 2, wherein the switching regulator (81) is designed for a constant operation of the LED track such that the current through the LED track is kept constant, as long as the switching regulator (81) at its input enough power receives.
    [4]
    4. A circuit for operating an LED track, comprising: - a controlled by a control unit (80) switching regulator (81) for a constant operation of the LED route with preferably constant current, - a converter (60) for providing a supply current for the Switching regulator (81), wherein for dimming the LED path of the converter (60) the switching regulator (81) supplied with such a supply current that the functionality of the switching regulator (81) is turned off.
    [5]
    5. The circuit of claim 4, wherein for dimming the LED path of the converter (60) made available supply current is reduced until this supply current is no longer sufficient to operate the switching regulator (81) such that the current for the LED Distance remains constant.
    [6]
    6. A circuit according to any one of claims 4 to 5, wherein the switching regulator (81) is designed for a constant operation of the LED track such that the current through the LED track is kept constant, as long as the switching regulator (81) at its input enough power, especially above a threshold, receives.
    [7]
    7. The circuit of claim 4, wherein when the functionality of the switching regulator is turned off, the LED path is dimmed by the converter changing the supply current accordingly.
    [8]
    8. A circuit according to any one of claims 4 to 7, wherein the control unit (80) is adapted to ensure a constant operation with preferably a constant current of the LED track.
    [9]
    9. The circuit according to one of claims 4 to 8, wherein the switching regulator (81) serving as an energy storage coil (L1 ') and a switch (Q1') for demagnetization and demagnetization of the coil (L1 '), wherein the functionality of Switching controller (81) is turned off such that the switch (Q1 '), the coil (L1') no longer up and demagnetized.
    [10]
    10. A circuit according to any one of claims 4 to 9, wherein the switching regulator (81) is designed as a down converter.
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    EP2315497A1|2009-10-09|2011-04-27|Nxp B.V.|An LED driver circuit having headroom/dropout voltage control and power factor correction|
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    US20120043899A1|2010-08-18|2012-02-23|Lutron Electronics Co., Inc.|Electronic Dimming Ballast Having Advanced Boost Converter Control|
    WO2013003673A1|2011-06-30|2013-01-03|Cirrus Logic, Inc.|Transformer-isolated led lighting circuit with secondary-side dimming control|
    US20130063035A1|2011-09-12|2013-03-14|Juno Manufacturing, LLC|Dimmable led light fixture having adjustable color temperature|
    DE102010028230A1|2010-04-27|2011-10-27|Tridonic Jennersdorf Gmbh|Circuit arrangement for operating LEDs|CN105142317A|2015-10-15|2015-12-09|苏州汉克山姆照明科技有限公司|High-power LED lamp driving circuit|
    DE102016208183A1|2016-05-12|2017-11-16|Tridonic Gmbh & Co Kg|Converter circuit for lamps with a measuring point for the detection of combined electrical parameters|
    法律状态:
    2019-12-15| MM01| Lapse because of not paying annual fees|Effective date: 20190430 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102013207718.1A|DE102013207718A1|2013-04-26|2013-04-26|Operating circuit for LEDs|
    PCT/AT2014/000092|WO2014172734A1|2013-04-26|2014-04-28|Operating circuit for leds|
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