WO2012132048A1 - Dispositif d'excitation de del et dispositif d'éclairage à del - Google Patents

Dispositif d'excitation de del et dispositif d'éclairage à del Download PDF

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Publication number
WO2012132048A1
WO2012132048A1 PCT/JP2011/069535 JP2011069535W WO2012132048A1 WO 2012132048 A1 WO2012132048 A1 WO 2012132048A1 JP 2011069535 W JP2011069535 W JP 2011069535W WO 2012132048 A1 WO2012132048 A1 WO 2012132048A1
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Prior art keywords
control
led
winding
voltage
unit
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PCT/JP2011/069535
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English (en)
Japanese (ja)
Inventor
充達 吉永
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サンケン電気株式会社
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to an LED driving device using an LED (light emitting diode) as a light source and an LED lighting device using the same.
  • white LEDs Light-Emitting-Diodes
  • LED lighting devices using LEDs as light sources have been put into practical use as LED brightness and efficiency have increased.
  • the configuration of the white LED is, for example, a configuration in which white light is obtained by mixing the light of LEDs of three colors of R (red), G (green), and B (blue), or a phosphor in a short wavelength LED such as blue.
  • a configuration is known in which white light is obtained by combining the above.
  • a DC-DC converter composed of a well-known switching regulator is used for an LED driving device that constitutes an LED lighting device and outputs an LED driving current.
  • the LED has a non-linear IV (current-voltage) characteristic.
  • VF forward voltage
  • the forward current hardly flows and does not emit light.
  • the forward bias exceeds a predetermined VF value, the current rapidly increases as the voltage rises, and light is emitted according to the amount of current.
  • the VF characteristics of LEDs generally have individual differences of about ⁇ 10%, and are known to fluctuate due to heat generation during light emission (energization). It causes flickering.
  • the LED driving device is required to stably emit light at a predetermined luminance regardless of individual differences and fluctuations in VF characteristics as described above.
  • the LED driving device must control the fluctuation of the LED current within ⁇ 10% of a predetermined value. Therefore, the LED driving device needs to include a constant current control feedback loop for controlling the current flowing through the LED to be constant.
  • FIG. 1 exemplifies the configuration of the LED driving device related to Japanese Patent Publication No. 2010-092997, which is generally called a flyback converter and is known as an isolated switching power supply.
  • the related LED lighting device 300 includes an LED driving device 201 and an LED load 202.
  • the LED driving device 201 includes an input capacitor 211, a transformer 212, a MOSFET 213, and a control unit 219. Further, the LED driving device 201 includes an error amplifier 215, a diode 216, and a photocoupler 217.
  • the error amplifier 215 of the related LED lighting device performs calculation based on the voltage generated in the current detection resistor 218 and the voltage value of the reference voltage source, and feeds back the calculation result to the control unit 219 via the photocoupler 217.
  • the LED driving device 201 controls the current flowing through the LED load 202 to be constant.
  • the related LED driving device 300 is a control provided on the primary side of the transformer 212 with a signal based on the LED current detected on the secondary side of the transformer 212 in order to control the MOSFET 213 according to the current flowing in the LED load 202. It is necessary to use a photocoupler 217 that transmits to the unit 219. Further, peripheral components such as the error amplifier 215 and its power supply circuit are required as a driving circuit for the photocoupler 217, which hinders downsizing and cost reduction of the LED driving device and the LED lighting device.
  • an LED driving device and an LED lighting device that are small in size and low in cost and perform constant current control of an LED load.
  • a transformer having a primary winding, a secondary winding, and a tertiary winding, and a switching element connected to the primary winding, the LED load via the secondary winding.
  • a feedback having an insulation type power converter for supplying power to the power source, a control information detector connected to the tertiary winding for detecting control information, and a voltage detector for detecting winding voltage information of the tertiary winding
  • a control unit that performs on / off control of the switching element, the feedback unit outputs a feedback signal in which the control information based on the on / off control and the winding voltage information are superimposed, and the control unit Provides an LED driving device that performs the on / off control based on the feedback signal.
  • an LED load including at least one LED, a transformer having a primary winding, a secondary winding, and a tertiary winding, and a switching element connected to the primary winding. And an insulated power converter that supplies power to the LED load via the secondary winding, a control information detector that is connected to the tertiary winding and detects control information, and a winding of the tertiary winding.
  • a feedback unit including a voltage detection unit that detects line voltage information; and a control unit that performs on / off control of the switching element, wherein the feedback unit includes the control information based on the on / off control, and the winding voltage information. Is output, and the control unit performs the on / off control based on the feedback signal.
  • FIG. 4 is a VF-ILED characteristic diagram for explaining the characteristics of the LED driving device according to the first embodiment of the present invention. It is a circuit diagram which shows the structure of the LED drive device and LED lighting apparatus which concern on the 1st comparative example of this invention. It is a circuit diagram which shows the structure of the LED drive device and LED lighting apparatus which concern on the 2nd comparative example of this invention. It is a circuit diagram which shows the structure of the LED drive device and LED lighting apparatus which concern on the 2nd Example of this invention.
  • FIG. 10 is a Vin-ILED characteristic diagram for explaining the characteristics of the LED driving device according to the fourth embodiment of the present invention.
  • FIG. 2 is a circuit diagram showing the configuration of the LED driving device and the LED lighting device according to the first embodiment of the present invention.
  • the LED lighting device 100 according to the present embodiment includes an LED driving device 1 and an LED load 2 connected to the LED driving device 1.
  • the LED drive device 1 has a DC-DC converter configuration including an insulating switching regulator, and uses input power supplied from an AC power source such as a commercial power source or a DC power source such as a battery as desired DC power. And output to the LED load 2 via the output terminal.
  • the LED driving device 1 includes an insulating power conversion unit 3 connected to the LED load 2, a control unit 4 connected to the power conversion unit 3, and a feedback unit 5 connected to the power conversion unit 3 and the control unit 4. With.
  • the LED driving device 1 includes a control power supply unit 6 that constitutes a part of the power conversion unit 3 and is connected to the control unit 4 and the feedback unit 5.
  • the LED load 2 is a direct-current light-emitting load that emits light according to the direct-current power supplied from the LED driving device 1, and is an R (red), G (green), B (blue), or short wavelength LED (Light (Emitting Diode). Is composed of at least one white LED.
  • the LED load 2 according to the present embodiment includes n white LEDs 2-1, 2-2,..., 2-n connected in series.
  • the power conversion unit 3 includes a well-known flyback converter having a transformer, converts input power to desired DC power, and supplies power to the LED load 2 via the transformer.
  • a transformer 33 having a primary winding P, a secondary winding S1, and a tertiary winding S2 and a switching element 34 connected to the primary winding P are provided.
  • the power conversion unit 3 includes an AC power supply 31, a diode bridge 32, an output diode 35, and a rectifying / smoothing unit including an output capacitor 36. Note that the black circles illustrated in the primary winding P, the secondary winding S1, and the tertiary winding S2 in FIG. 2 mean the polarity of each winding.
  • Both ends of the AC power supply 31 are connected to the first and second terminals of the diode bridge 32.
  • the third terminal of the diode bridge 32 is connected to one end of the primary winding P of the transformer 33, and the fourth terminal is connected to the primary side ground.
  • the other end of the primary winding P is connected to one end (drain terminal) of a switching element 34 using, for example, a MOSFET.
  • the other end (source terminal) of the switching element 34 is connected to the primary side ground, and the control terminal (gate terminal) is connected to the control unit 4.
  • the secondary winding S1 of the transformer 33 is wound in a reverse polarity with respect to the primary winding P through the core, one end of which is connected to the anode terminal of the output diode 35 and the other end is connected to the secondary side ground.
  • the cathode terminal of the output diode 35 is connected to one end of the output capacitor 36, and is connected to one end (anode terminal) of the LED load 2 through the first terminal of the power conversion unit 3.
  • the other end of the output capacitor 36 is connected to the other end of the secondary winding S1 and the secondary side ground, and is connected to the other end (cathode terminal) of the LED load 2 via the second terminal of the power conversion unit 3. Is done.
  • the AC power supply 31 is a commercial power supply that outputs AC voltage such as AC100V from both ends, and the diode bridge 32 rectifies positive and negative AC voltage to generate DC voltage (pulsating voltage) in either positive or negative direction. , And output via the third terminal and the fourth terminal. Since the AC power supply 31 and the diode bridge 32 output a DC voltage, they can be replaced with a DC power supply such as a battery. Further, a capacitor may be connected between the third terminal and the fourth terminal (primary side ground) of the diode bridge 32. A DC current flows from the diode bridge 32 through the primary winding P and the switching element 34 while the switching element 34 is on (conductive).
  • the control unit 4 performs on / off control of the switching element 34 constituting the power conversion unit 3 in order to cause the LED load 2 to emit light stably at a predetermined luminance.
  • the control unit 4 outputs an error amplifier 41, a reference voltage source 42, a capacitor 43, and a comparator 44 in order to output a control signal to the control terminal of the switching element 34 based on a feedback signal (hereinafter referred to as FB signal) output from the feedback unit 5.
  • FB signal feedback signal
  • the control unit 4 is constituted by, for example, a single semiconductor integrated circuit (IC) including the above-described constituent elements, and includes at least an FB terminal, an OUT terminal, and a Vcc terminal.
  • the control unit 4 includes known protection functions such as an overcurrent protection function and an overvoltage protection function, but illustration and description thereof are omitted.
  • the inverting input terminal ( ⁇ terminal) of the error amplifier 41 is connected to the feedback unit 5 via the FB terminal of the control unit 4, and the non-inverting input terminal (+ terminal) is connected to the positive electrode of the reference voltage source 42 for output.
  • the terminal is connected to the non-inverting input terminal of the comparator 44.
  • the negative electrode of the reference voltage source is connected to the primary side ground.
  • the capacitor 43 is connected between the inverting input terminal and the output terminal of the error amplifier 41.
  • the inverting input terminal of the comparator 44 is connected to the triangular wave generator 45, and the output terminal is connected to the control terminal of the switching element 34 via the OUT terminal of the control unit 4.
  • the error amplifier 41 amplifies an error between the voltage value of the FB signal output from the feedback unit 5 and the voltage value of the reference voltage source 42, and outputs the error signal from its output terminal.
  • the comparator 44 compares the voltage value of the error signal output from the error amplifier 41 with the voltage value of the triangular wave signal (sawtooth wave signal) output from the triangular wave generator 45, and the voltage value of the error signal is a triangular wave signal.
  • a pulse signal (control signal) of H (High) level is output to the switching element 34 for a period larger than the voltage value of.
  • the comparator 44 outputs an L (Low) level control signal to the switching element 34 during a period in which the voltage value of the error signal is smaller than the voltage value of the triangular wave signal.
  • the switching element 34 is turned on while the control signal is at the H level and turned off while the control signal is at the L level.
  • the control unit 4 according to the present embodiment is a PWM control circuit, and when the FB signal output from the feedback unit 5 becomes small, the duty ratio (on width) of the control signal becomes large and the on time of the switching element 34 becomes long. The voltage across the output capacitor 36 increases. Further, when the FB signal output from the feedback unit 5 increases, the duty ratio of the control signal decreases, the ON time of the switching element 34 decreases, and the voltage across the output capacitor 36 decreases. That is, the control unit 4 according to the present embodiment performs PWM control on the switching element 34.
  • the feedback unit 5 detects the voltage information of the tertiary winding S2 and the information of the on / off control in order to output the FB signal necessary for the on / off control of the switching element 34 to the control unit 4.
  • the feedback unit 5 includes a diode 51, a capacitor 52, a Zener diode 53, a capacitor 54, a smoothing capacitor 55, and resistors 56, 57 and 58.
  • the Zener diode 53 and the smoothing capacitor 55 constitute a control information detector that outputs a control information signal
  • the resistor 58 constitutes a voltage detector that outputs a voltage signal.
  • the anode terminal of the diode 51 is connected to one end of the tertiary winding S ⁇ b> 2 of the transformer 33 constituting the control power supply unit 6, and the cathode terminal is connected to the cathode terminal of the Zener diode 53 via the resistor 57.
  • the capacitor 52 is a parasitic capacitance of the diode 51 that appears between the anode terminal and the cathode terminal of the diode 51.
  • the anode terminal of the Zener diode 53 is connected to the primary side ground, and the cathode terminal is connected to one end of the smoothing capacitor 55 via the resistor 56.
  • the Zener diode 53 corresponds to the voltage clamp unit of the present invention, and in order to obtain the effect described later, the Zener breakdown occurs due to a voltage value lower than the peak value of the winding voltage generated in the tertiary winding S2.
  • the capacitor 54 is a parasitic capacitance of the Zener diode 53 that appears between the anode terminal and the cathode terminal of the Zener diode 53.
  • the smoothing capacitor corresponds to the voltage smoothing unit of the present invention.
  • One end of the smoothing capacitor 55 is connected to the resistor 58 constituting the voltage detecting unit, and is connected to the inverting input terminal of the error amplifier 41 via the FB terminal of the control unit 4. Connected.
  • the other end of the smoothing capacitor 55 is connected to the primary side ground.
  • One end of the resistor 58 is connected to one end of the smoothing capacitor 62 constituting the control power supply unit 6 and the Vcc terminal of the control unit 4, and the other end is connected to one end of the smoothing
  • a winding voltage (flyback voltage) is generated in the tertiary winding S2 of the transformer 33 and applied to both ends of the Zener diode 53.
  • the Zener voltage of the Zener diode 53 is set such that the Zener diode 53 breaks down due to a voltage value lower than the peak value of the winding voltage, and the voltage across the Zener diode 53 is clamped. Therefore, a pulsed voltage waveform is generated at both ends of the Zener diode 53 according to the Zener voltage and the on / off operation of the switching element 34 or according to the Zener voltage and the power supply period to the LED load 2.
  • the smoothing capacitor 55 smoothes the voltage waveform described above, the voltage across the smoothing capacitor 55 is the power supply to the LED load 2 via the duty ratio of the control signal output by the control unit 4 or the secondary winding S1.
  • the control information signal changes in voltage level according to the period.
  • a voltage corresponding to the Vcc terminal voltage of the control unit 4 is generated as voltage information at both ends of the resistor 58 and is superimposed on the voltage across the smoothing capacitor 55.
  • the both-ends voltage of the smoothing capacitor 55 and the both-ends voltage of the resistor 58 are output to the error amplifier 41 through the FB terminal of the control unit 4 as an FB signal in which the control information signal and the voltage signal are superimposed.
  • the control power supply unit 6 includes a rectifying / smoothing unit including a tertiary winding S2, a diode 61, and a smoothing capacitor 62 in order to supply the control unit 4 with driving power necessary for on / off control of the switching element 34.
  • the tertiary winding S2 of the transformer 33 is wound in reverse polarity with respect to the primary winding P through the core, one end of which is connected to the anode terminals of the diode 51 and the diode 61, and the other end is connected to the primary side ground.
  • the cathode terminal of the diode 61 is connected to one end of the smoothing capacitor 62 and the Vcc terminal of the control unit 4, and is connected to one end of the resistor 58 of the feedback unit 5.
  • the other end of the smoothing capacitor 62 is connected to the other end of the tertiary winding S2 of the transformer 33 and the primary side ground.
  • the winding voltage is generated in the tertiary winding S ⁇ b> 2 and the smoothing capacitor 62 is charged via the diode 61 during the period when the switching element 34 is turned off (cut off).
  • the voltage across the smoothing capacitor 62 is supplied to each part of the control unit 4 via the Vcc terminal as a control power source for the control unit 4.
  • FIG. 3 is a VF-ILED characteristic diagram for explaining the characteristics of the LED driving apparatus according to the first embodiment of the present invention.
  • the X axis (VF) indicates the forward voltage of the LED load
  • the Y axis (ILED) indicates the LED current.
  • the inventor of the present invention prepares an LED driving device related to the LED driving device 1 according to the present embodiment and LED driving devices according to first and second comparative examples described later, and exchanges the AC with each LED driving device.
  • AC100V was supplied as a power supply, and each LED drive device was driven.
  • the VF of each LED load supplied with a current from each LED driving device was varied by about ⁇ 20% from the median, and the steady value of ILED at the time of variation was measured.
  • the VF of the LED load 2 in the LED driving device 1 means a total value of the VFs of the respective LEDs 2-a, 2-b,..., 2-n.
  • the ILED is shown as a percentage based on the current value measured when the VF of each LED load is the median value.
  • the solid line A in the figure indicates the characteristics measured by the LED driving device 1 according to the present embodiment shown in FIG.
  • a broken line B in the figure indicates a characteristic measured by the related LED driving device shown in FIG.
  • a broken line C in the figure indicates characteristics measured by the LED driving device according to the first comparative example shown in FIG.
  • the LED driving device according to the first comparative example detects control information including the Zener diode 53 and the smoothing capacitor 55 from the LED driving device 1 according to this embodiment in order to detect only the winding voltage information of the tertiary winding S2. Consists of all parts.
  • the broken line D in a figure shows the characteristic measured by the LED drive device which concerns on the 2nd comparative example shown in FIG.
  • the LED drive device according to the second comparative example is configured by removing the voltage detection unit including the resistor 58 from the LED drive device 1 according to the present embodiment in order to detect only control information obtained from the tertiary winding S2.
  • the related LED driving device (broken line B) directly detects the LED current and performs constant current control. Therefore, the fluctuation of ILED is the smallest with respect to the fluctuation of VF, and ILED has 80% or 120% of VF as the median value. Even when it became, it became substantially equal to the reference value.
  • the LED driving device according to the first comparative example (broken line C) has a large fluctuation of ILED with respect to slight VF fluctuation, and when VF fluctuates several percent from the median, ILED is reduced from 10% to 250% of the reference value. changed.
  • the LED driving device according to the second comparative example (broken line D) is configured so that the LED variation with respect to the VF variation is less than that of the first comparative example, and the VF is 90% or 110% of the median value. Was controlled from 90% to 110% of the reference value. Since the LED driving device 1 (solid line A) according to the present embodiment performs constant current control based on the alternative characteristics of the LED current, the variation of the ILED with respect to the variation of VF is larger than the related LED driving device. Specifically, when the VF is 80% of the median value, the ILED is about 97% of the reference value, and when the VF is 120% of the median value, the ILED is about 92% of the reference value.
  • the LED driving device 1 and the LED lighting device 100 according to the first embodiment of the present invention have the following effects.
  • the LED drive is controlled by controlling the DC power supplied to the LED load 2 based on the winding voltage generated in the tertiary winding S2 of the transformer 33 and the control information obtained from this winding voltage.
  • the device 1 can perform constant current control of the LED load 2.
  • the LED lighting device 100 can prevent the light of the LED load 2 from flickering.
  • the feedback unit 5 as a constant current control feedback loop is connected to the primary side of the transformer 33, it is not necessary to provide an insulating signal transmission element such as a photocoupler, and the LED driving device 1 and the LED lighting device 100 can be made small and low cost.
  • the power supplied to the LED load 2 can be controlled at a constant power by reducing the resistance value of the resistor 58 and increasing the influence of the voltage signal on the FB signal.
  • FIG. 6 is a circuit diagram showing the configuration of the LED driving device and the LED lighting device according to the second embodiment of the present invention.
  • the LED lighting device 200 according to the present embodiment includes an LED driving device 101 and an LED load 2 connected to the LED driving device 101.
  • the LED drive device 101 is connected to the insulated power conversion unit 103 connected to the LED load 2, the control unit 104 connected to the power conversion unit 103, and the power conversion unit 103 and the control unit 104.
  • the LED driving device 101 includes a control unit 104, a control power supply unit 6 connected to the feedback unit 5, and a resonance signal detection unit 7 connected to the control power supply unit 6.
  • the power conversion unit 103 is configured by a well-known pseudo-resonance flyback converter, and the control unit 104 receives the voltage resonance signal from the resonance signal detection unit 7 and receives power.
  • the LED driving device 1 and the LED lighting device 100 according to the first embodiment are different in that they are configured to control the conversion unit 103. Since other configurations are configured substantially the same, detailed description thereof is omitted.
  • the power conversion unit 103 includes a resonance capacitor 37 connected in parallel to the switching element 34 in order to freely oscillate the voltage across the switching element 34 during the period when the switching element 34 is turned off.
  • the resonance capacitor 37 and the resonance reactor Lr resonate.
  • the resonant reactor Lr is a leakage inductance between the primary winding P and the secondary winding S2 of the transformer 33.
  • the resonance signal detection unit 7 detects winding voltage information generated in the tertiary winding S2 of the transformer 33 during a period in which the switching element 34 is turned off, and as a voltage resonance signal when the resonance capacitor 37 and the resonance reactor Lr resonate. Output to the control unit 104.
  • the resonance signal detection unit 7 is connected to the control power supply unit 6 and the control unit 104, and is configured to rectify and smooth the winding voltage of the tertiary winding S2.
  • the control unit 104 includes a control determination unit 46 and an AND circuit 47 for performing on / off control of the switching element 34 based on the control information signal of the control information detection unit 5 and the voltage resonance signal of the resonance signal detection unit 7.
  • the control determination unit 46 is connected to the resonance signal detection unit 7, the triangular wave generator 45, and the AND circuit 47.
  • the control determination unit 46 controls the oscillation of the triangular wave generator 45 and the switching element 34 via the AND circuit 47 based on the result of determining the voltage level of the voltage resonance signal. Specifically, when the winding voltage of the tertiary winding S2 decreases and the voltage level of the voltage resonance signal is lower than a predetermined value, an H level determination signal is output, and the voltage level of the voltage resonance signal is lower than the predetermined value. Is also high, an L level determination signal is output.
  • the first input terminal of the AND circuit 47 is connected to the output terminal of the comparator 44, the second input terminal is connected to the control determination unit 46, and the output terminal is connected to the control terminal of the switching element 34.
  • the AND circuit 47 turns on the switching element 34 when both the control signal of the comparator 44 and the determination signal of the control determination unit 46 are at the H level.
  • the triangular wave generator 45 oscillates and outputs a triangular wave signal when the determination signal of the control determination unit 46 is at the H level.
  • the control information signal in the LED drive device 101 varies in voltage level according to the duty ratio and frequency of the control signal or the period of power supply to the LED load 2 due to the characteristics of the quasi-resonant flyback converter.
  • FIG. 7 is a characteristic diagram showing a change in ILED with respect to a VF variation of the LED load between the LED driving device 101 and the LED lighting device 200 according to the present embodiment and the LED driving device 1 and the LED lighting device 100 according to the first embodiment. .
  • the solid line E in the figure indicates the characteristics measured by the LED driving device 101 according to the present embodiment shown in FIG.
  • a broken line A in the figure indicates a characteristic measured by the LED driving device 1 according to the first embodiment indicated by a solid line A in FIG. 3.
  • the LED drive device 101 (solid line E) according to the present embodiment exhibits good current control characteristics similarly to the LED drive device 1 according to the first embodiment, and sufficiently satisfies the practical accuracy requirement in general lighting applications. The result which shows that is satisfied is obtained.
  • the LED driving device 101 and the LED lighting device 200 according to the second embodiment of the present invention have the same effects as the LED driving device 1 and the LED lighting device 100 according to the first embodiment.
  • FIG. 8 is a circuit diagram showing the configuration of the LED driving device and the LED lighting device according to the third embodiment of the present invention.
  • the LED lighting device 100a according to the present embodiment includes an LED driving device 1a and an LED load 2 connected to the LED driving device 1a.
  • the LED drive device 1a has the same configuration as that of the LED drive device 1 according to the first embodiment shown in FIG. 2, and one end of the primary winding P of the transformer 33 and the output terminal of the diode bridge 32. And an AC input correcting resistor 71 having the other end connected to one end of resistors 56 and 58 and one end of a capacitor 55.
  • the AC input voltage at the output terminal of the diode bridge 32 and one end of the primary winding P of the transformer 33 is output to the error amplifier 41 as an AC input correction voltage signal by the AC input correction resistor 71.
  • the LED driving device 1a even if there is a VF variation or a wide range of AC input fluctuation, it is difficult to actually use by applying the VF fluctuation correction by the resistor 58 and the AC input correction by the resistor 71.
  • the constant current characteristic without any can be obtained.
  • a constant current circuit composed of a current detection resistor and an operational amplifier, a photocoupler for sending a feedback signal, and the like are not required. For this reason, an inexpensive LED drive device and LED lighting device can be provided.
  • the power conversion unit 3 is not limited to the flyback method, and may be a forward method or the like.
  • FIG. 9 is a circuit diagram showing the configuration of the LED driving device and the LED lighting device according to the fourth embodiment of the present invention.
  • the LED lighting device 200a according to the present embodiment includes an LED driving device 101a and an LED load 2 connected to the LED driving device 101a.
  • the LED drive device 101a has the same configuration as that of the LED drive device 101 according to the second embodiment shown in FIG. 6, but also has one end at one end of the primary winding P of the transformer 33 and the output terminal of the diode bridge 32. And an AC input correcting resistor 71 having the other end connected to one end of resistors 56 and 58 and one end of a capacitor 55.
  • the effect of the LED driving device 101 according to the second embodiment can be obtained, and the AC input correction resistor 71 is further provided. Even if the input fluctuates, by applying AC input correction by the resistor 71, a constant current characteristic that does not hinder actual use can be obtained. Further, a constant current circuit composed of a current detection resistor and an operational amplifier, a photocoupler for sending a feedback signal, and the like are not required. For this reason, an inexpensive LED drive device and LED lighting device can be provided.
  • FIG. 10 is a Vin-ILED characteristic diagram for explaining the characteristics of the LED driving apparatus according to the fourth embodiment of the present invention.
  • Vin is an AC input voltage
  • ILED is a current flowing through the LED.
  • the VF of the LED load 2 is set to the median value (VF 100%) and the configuration in which the VF is set in a range of ⁇ 20%
  • an experiment was performed to measure the load current ILED when switching Vin.
  • a single IC including the control unit 4 (control unit 104) and the switching element 34 can be configured.
  • the control unit 4 (control unit 104) and the feedback unit 5 can be configured as a single IC.
  • the transformer 33 has primary to tertiary windings.
  • the LED driving device and the LED lighting device are configured using a transformer having an n-order winding (n is a natural number of 3 or more). Can be configured.
  • the feedback unit connected to the tertiary winding of the transformer outputs a feedback signal in which the control information based on the on / off control of the switching element and the winding voltage information of the tertiary winding are superimposed, and the control unit Since the on / off control of the switching element is performed by the feedback signal, it is possible to provide an LED driving device and an LED lighting device which are configured in a small size and at low cost and perform constant current control of the LED load.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un dispositif d'excitation de DEL qui comprend : une unité de conversion d'énergie isolante comprenant un transformateur qui comporte une bobine primaire, une bobine secondaire et une bobine tertiaire, et un élément de commutation relié à la première bobine, ladite unité de conversion d'énergie isolante fournissant de l'énergie pour la charge d'une DEL par le biais de la bobine secondaire ; une unité de rétroaction reliée à la bobine tertiaire, ladite unité de rétroaction comprenant en outre une unité de détection d'informations de commande qui détecte des informations de commande et une unité de détection de tension qui détecte des informations de tension de bobine de la bobine tertiaire ; et une unité de commande qui commande la marche et l'arrêt de l'élément de commutation. L'unité de rétroaction émet un signal de rétroaction dans lequel sont superposées les informations de commande basées sur la commande de marche/arrêt et les informations de tension de bobine, et l'unité de commande effectue la commande de marche/arrêt en fonction du signal de rétroaction.
PCT/JP2011/069535 2011-03-30 2011-08-30 Dispositif d'excitation de del et dispositif d'éclairage à del WO2012132048A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2011-076139 2011-03-30
JP2011076139 2011-03-30
JP2011-123255 2011-06-01
JP2011123255A JP4968399B2 (ja) 2011-03-30 2011-06-01 Ｌｅｄ駆動装置及びｌｅｄ照明装置

Publications (1)

Publication Number Publication Date
WO2012132048A1 true WO2012132048A1 (fr) 2012-10-04

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JP (1) JP4968399B2 (fr)
WO (1) WO2012132048A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015113090A1 (fr) * 2014-01-29 2015-08-06 Tridonic Gmbh & Co Kg Détection d'un module led
WO2015113095A1 (fr) * 2014-01-30 2015-08-06 Tridonic Gmbh & Co Kg Détection d'un module led
WO2016078590A1 (fr) 2014-11-19 2016-05-26 Huawei Technologies Co., Ltd. Appareil et procédé de détection de commutation à tension nulle
US9924570B2 (en) 2014-07-28 2018-03-20 Tridonic Gmbh & Co Kg Isolated active circuit for measuring the current of an illuminant on the secondary side
CN116647956A (zh) * 2023-06-12 2023-08-25 钰泰半导体股份有限公司 基于串联开关的并联分时复用亮度控制系统

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101360642B1 (ko) 2012-04-20 2014-02-10 엘지이노텍 주식회사 조명 구동 장치 및 이의 조명 구동 방법
US20140246992A1 (en) * 2013-03-04 2014-09-04 Osram Sylvania Inc. Primary side control for switch mode power supplies

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Publication number Priority date Publication date Assignee Title
JPS6039263U (ja) * 1983-08-24 1985-03-19 和泉電気株式会社 発光ダイオ−ドランプ点灯回路
JP2005011739A (ja) * 2003-06-20 2005-01-13 Matsushita Electric Ind Co Ltd 調光時誤動作防止回路および照明装置
JP2011062043A (ja) * 2009-09-14 2011-03-24 Sanken Electric Co Ltd 力率改善回路及びこれを用いたｌｅｄ照明器具

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPS6039263U (ja) * 1983-08-24 1985-03-19 和泉電気株式会社 発光ダイオ−ドランプ点灯回路
JP2005011739A (ja) * 2003-06-20 2005-01-13 Matsushita Electric Ind Co Ltd 調光時誤動作防止回路および照明装置
JP2011062043A (ja) * 2009-09-14 2011-03-24 Sanken Electric Co Ltd 力率改善回路及びこれを用いたｌｅｄ照明器具

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015113090A1 (fr) * 2014-01-29 2015-08-06 Tridonic Gmbh & Co Kg Détection d'un module led
WO2015113095A1 (fr) * 2014-01-30 2015-08-06 Tridonic Gmbh & Co Kg Détection d'un module led
US9924570B2 (en) 2014-07-28 2018-03-20 Tridonic Gmbh & Co Kg Isolated active circuit for measuring the current of an illuminant on the secondary side
WO2016078590A1 (fr) 2014-11-19 2016-05-26 Huawei Technologies Co., Ltd. Appareil et procédé de détection de commutation à tension nulle
EP3108575B1 (fr) * 2014-11-19 2021-01-06 Huawei Technologies Co. Ltd. Appareil et procédé de détection de commutation à tension nulle
CN116647956A (zh) * 2023-06-12 2023-08-25 钰泰半导体股份有限公司 基于串联开关的并联分时复用亮度控制系统
CN116647956B (zh) * 2023-06-12 2024-05-03 钰泰半导体股份有限公司 基于串联开关的并联分时复用亮度控制系统

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