WO2010098174A1 - Circuit d'énergie - Google Patents

Circuit d'énergie Download PDF

Info

Publication number
WO2010098174A1
WO2010098174A1 PCT/JP2010/051352 JP2010051352W WO2010098174A1 WO 2010098174 A1 WO2010098174 A1 WO 2010098174A1 JP 2010051352 W JP2010051352 W JP 2010051352W WO 2010098174 A1 WO2010098174 A1 WO 2010098174A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
voltage
capacitor
power supply
current
Prior art date
Application number
PCT/JP2010/051352
Other languages
English (en)
Japanese (ja)
Inventor
正史 加瀬
太朗 中臺
謙治 加藤
Original Assignee
株式会社光波
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社光波 filed Critical 株式会社光波
Publication of WO2010098174A1 publication Critical patent/WO2010098174A1/fr

Links

Images

Classifications

    • 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
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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]

Definitions

  • the present invention relates to a power supply circuit, and more particularly to a power supply circuit capable of obtaining a stable desired output voltage.
  • an LED lighting device provided with a boost type power factor correction circuit (for example, see Patent Document 1).
  • a power supply voltage from an AC power supply is converted into a DC voltage, and then the DC voltage is boosted and supplied to an LED load.
  • the power factor correction circuit in the conventional LED lighting device described in Patent Document 1 is a step-up type, a DC voltage lower than the power supply voltage cannot be obtained. Therefore, when driving the LED load with a DC voltage lower than the power supply voltage, a circuit for stepping down the voltage to the drive voltage of the LED load is required after the boost type power factor correction circuit. As a result, the circuit configuration becomes complicated, and the number of components increases, resulting in an increase in manufacturing cost.
  • the present invention has been made to solve the above-described conventional problems, and its specific purpose is to supply an output voltage lower or higher than the input voltage to the DC load without providing a special circuit.
  • An object of the present invention is to provide a power circuit that can be realized.
  • a switch circuit that is turned on and off based on the first and second switch signals, and electric power that supplies a direct current to a DC load by turning the switch circuit on and off A power supply circuit; and a control circuit that outputs the first and second switch signals to the switch circuit, wherein the power supply circuit is electrically connected based on a direct current from a rectifier circuit when the switch circuit is on.
  • a storage circuit that stores energy and outputs a direct current based on the stored electrical energy; a first capacitor connected in series with the direct current load and charged by the direct current from the storage circuit; A second capacitor disposed in parallel with the DC load and charged by the DC current from the storage circuit, the DC load being connected to the switch.
  • the power supply is driven by a direct current from the storage circuit and the first capacitor when the circuit is on, and is driven by a direct current from the second capacitor when the switch circuit is off.
  • the storage circuit charges the first capacitor when the switch circuit is off.
  • the first capacitor is connected between a connection point between the negative electrode terminal of the second capacitor and the negative electrode terminal of the DC load and the first capacitor.
  • a reverse current prevention diode is connected to prevent a direct current from flowing from the first capacitor to the second capacitor.
  • the present invention can supply an output voltage lower or higher than the input voltage to the DC load with a simple circuit configuration without providing a special circuit.
  • FIG. 1 is a circuit diagram schematically showing a configuration example of a power supply circuit according to a first embodiment of the present invention.
  • FIG. 2 is a block diagram schematically showing a configuration example of a control IC applied to the power supply circuit shown in FIG. 1. It is a block diagram which shows the other structural example of control IC roughly. It is a circuit diagram which shows roughly the example of 1 structure of the power supply circuit which is 2nd Embodiment based on this invention.
  • reference numeral 10 denotes a constant current power supply circuit (hereinafter referred to as a power supply circuit).
  • the basic configuration of the power supply circuit 10 includes a rectifier circuit 20 and a power factor control circuit (PFC circuit) 30 that improves the power factor of the DC voltage converted by the rectifier circuit 20.
  • the constant current load connected to the output terminal of the PFC circuit 30 is not particularly limited, but is a lighting device such as an organic EL or LED. For example, a plurality of light emitting diodes (LEDs) 41,. An LED series circuit 40 connected in series is illustrated.
  • the rectifier circuit 20 includes a diode bridge 21 formed of four diodes.
  • the rectifier circuit 20 performs full-wave rectification on the AC voltage input from the commercial AC power supply 11 through the input terminal and converts the AC voltage into a DC voltage. This DC voltage is supplied to the PFC circuit 30 through the output terminal of the rectifier circuit 20.
  • a PFC circuit 30 shown in FIG. 1 is a circuit that generates a constant output voltage by stepping up or down an input voltage to a desired voltage.
  • MOSFET MOSFET
  • Q primary capacitor C1
  • backflow prevention diode D2 secondary capacitor C2
  • control IC 31 control IC 31.
  • a power supply circuit is configured by the ripple current removing capacitor 22, the transformer Tr, the rectifier diode D1, the primary capacitor C1, the backflow prevention diode D2, and the secondary capacitor C2.
  • the transformer Tr, the primary capacitor C1, and the secondary capacitor C2 constitute an accumulation circuit.
  • the DC voltage whose power factor has been improved by the PFC circuit 30 is output to the LED series circuit 40 through the output terminal.
  • the control IC 31 is composed of an integrated circuit that improves the power factor by aligning the input voltage from the rectifier circuit 20 and the waveform of the input current flowing through the switching element Q.
  • This type of control IC 31 is not particularly limited.
  • the control IC 31 includes a power supply voltage input VCC terminal, a ground connection GND terminal, a feedback signal input FB terminal, a switching drive OUT terminal, and a switching current detection IS terminal.
  • a ZCD terminal for zero current detection and a MUL terminal for voltage input proportional to the full-wave rectified voltage are shown.
  • the control IC 31 generates a control pulse based on input signals to the VCC terminal, FB terminal, MUL terminal, IS terminal, and ZCD terminal.
  • the power factor is improved by changing the magnitude of the output current in accordance with the time during which the switching element Q that is on / off controlled by the control pulse is turned on.
  • a capacitor C3 is connected between the VCC terminal and the GND terminal of the control IC 31.
  • One end of the capacitor C3 is connected to the auxiliary power supply voltage VCC, and the other end of the capacitor C3 is connected to the ground.
  • a positive terminal (+) of the rectifier circuit 20 is connected between one end of the capacitor C3 and the auxiliary power supply voltage VCC via a resistor R1.
  • a connection point between the resistor R1 and the capacitor C3 is connected to the second winding Tr2 of the transformer Tr via a backflow preventing diode D4.
  • a voltage dividing resistor composed of resistors R2 and R3 is connected.
  • the output of the voltage dividing resistor is connected to the MUL terminal of the control IC 31.
  • a sine wave full-wave rectified voltage (voltage waveform proportional to the absolute value voltage of the commercial AC power supply 11) obtained by dividing the full-wave rectified voltage of the rectifier circuit 20 with resistors R2 and R3 is input to the MUL terminal. This prevents the generation of lowering and harmonic current.
  • a single transformer Tr is interposed as shown in FIG.
  • the transformer Tr is provided with a first winding Tr1 and a second winding Tr2.
  • One end of the first winding Tr1 is connected to the positive terminal of the rectifier circuit 20.
  • the other end of the first winding Tr1 is connected to one end (negative terminal) of the LED series circuit 40 through a series circuit including a rectifier diode D1, a primary capacitor C1, and a backflow prevention diode D2.
  • a charging diode D3 is connected to one end of the first winding Tr1 and a connection point between the primary capacitor C1 and the cathode of the backflow prevention diode D2.
  • the reverse current prevention diode D2 prevents the charging current to the primary capacitor C1 from flowing backward.
  • a secondary capacitor C2 is connected in parallel with the LED series circuit 40 between the anode of the backflow prevention diode D2 and the negative terminal of the rectifier circuit 20.
  • the drain of the switching element Q is connected to the connection point of the rectifier diode D1 and the primary capacitor C1.
  • the source of the switching element Q is connected to the ground via a current detection resistor R4.
  • the connection point of the source of the switching element Q and the resistor R4 is connected to the IS terminal of the control IC 31 via the resistor R5, and detects the switching current of the switching element Q.
  • the gate of the switching element Q is connected to the OUT terminal of the control IC 31 via the resistor R6.
  • the second winding Tr2 of the transformer Tr is electrically insulated from the primary winding Tr1.
  • One end of the second winding Tr2 is connected to the ground.
  • the other end of the second winding Tr2 is connected to the ZCD terminal of the control IC 31 via a resistor R7, and the value of the current flowing through the transformer Tr is detected.
  • the switching element Q changes from the on state to the off state, a current flows through the secondary winding Tr2 by a voltage proportional to the induced voltage of the first winding Tr1 induced in the secondary winding Tr2.
  • the switching element Q is turned on.
  • a series circuit composed of resistors R8, R9, and R10 is connected to one end (positive terminal) of the secondary capacitor C2.
  • An inverting input terminal of the inverting amplifier 32 is connected to a connection point between the resistor R9 and the resistor R10.
  • the resistors R9 and R10 constitute a current detection circuit that detects a current flowing through the LED series circuit 40.
  • the divided voltage value at the connection point between the resistor R9 and the resistor R10 is amplified with a predetermined amplification factor by the inverting amplifier 32, and is input to the FB terminal of the control IC 31 as a current detection value. Feedback control is performed in order to make the current of the LED series circuit 40 constant by the detected current value.
  • one end of the resistor R10 opposite to the resistor R9 side is connected to an offset voltage for operating the inverting amplifier 32.
  • the control IC 31 shown in FIG. 2 mainly includes an error amplifier 33, a multiplier (MUL) 34, a comparator 35, a flip-flop 36, a driver 37, and a zero current detector 38.
  • MUL multiplier
  • the power supply voltage from the commercial AC power supply 11 is supplied to the rectifier circuit 20.
  • the full-wave rectified direct current is supplied to the PFC circuit 30.
  • a direct current is supplied to the control IC 31 to start the operation, and a gate voltage is applied to the switching element Q.
  • FIG. 1 when the switching element Q is in the ON state, a switching current flows to the ground through the switching element Q. The current energy at that time is accumulated in the first winding Tr1 of the transformer Tr. Thereafter, when the switching element Q is turned off, the inflow of current to the first winding Tr1 is stopped, and the current energy accumulated in the first winding Tr1 is released through the rectifier diode D1, and is supplied to the primary capacitor C1. Accumulated.
  • the primary capacitor C1 functions as a first output power supply when the switching element Q is in an on state.
  • the current energy stored in the primary capacitor C1 is released, and a current flows in the closed circuit of the switching element Q, the secondary capacitor C2, and the primary capacitor C1 to supply a charging current to the secondary capacitor C2, and the switching element Q, LED A current flows in the closed circuit of the series circuit 40, the backflow prevention diode D2, and the primary capacitor C1.
  • the output of the voltage dividing resistor composed of the resistors R9 and R10 which are current detection circuits of the LED series circuit 40 is input to the inverting input terminal of the inverting amplifier 32 as shown in FIGS.
  • the inverting amplifier 32 amplifies the phase-inverted voltage to a predetermined amplification factor.
  • the amplified voltage is supplied to the inverting input terminal of the error amplifier 33 in the control IC 31 through the FB terminal of the control IC 31.
  • the voltage input to the FB terminal of the control IC 31 is compared with the reference voltage Vref, and a voltage having a level corresponding to the error voltage with respect to the reference voltage Vref is amplified by a predetermined amount. Amplify to rate. The amplified error voltage is output to the multiplier 34 in the control IC 31.
  • the multiplier 34 is supplied with the divided output voltage from the rectifier circuit 20 through the MUL terminal of the control IC 31, and multiplies the output voltage by the output voltage from the error amplifier 34. Voltage is generated.
  • the voltage of the multiplier 34 is output to the inverting input terminal of the comparator 35 in the control IC 31 as a current target value of the switching current.
  • the output voltage of the multiplier 34 has a waveform similar to the full-wave rectification waveform, and the amplitude is a voltage proportional to the current flowing through the LED series circuit 40 (the discharge amount of the primary capacitor C1).
  • the voltage converted by the current detection resistor R4 of the switching element Q is compared with the voltage from the multiplier 34, and the pulse width-modulated pulse is obtained. appear.
  • the output of the comparator 35 is supplied to the reset terminal R of the flip-flop 36 in the control IC 31.
  • the output of the comparator 35 is power amplified by a driver 37 in the control IC 31 and drives the gate of the switching element Q.
  • the switching element Q controls the on-time of the switching element Q by the pulse signal modulated by the pulse width generated by the comparator 35 and also controls the current flowing through the first winding Tr1 of the transformer Tr.
  • constant current control can be performed so that the reference voltage Vref of the error amplifier 33 and the divided voltage from the secondary capacitor C2 are equal.
  • the output of the comparator 35 is inverted and the flip-flop 36 is reset.
  • the switching element Q is turned off, the charging diode D3 becomes conductive, and the current flowing through the transformer Tr flows into the primary capacitor C1 through the rectifier diode D1.
  • This current flows in the closed circuit of the primary capacitor C1, the charging diode D3, and the primary winding Tr1 of the transformer Tr, and the primary capacitor C1 is charged. Since the current flowing through the primary winding Tr1 is directly supplied to the primary capacitor C1, a voltage obtained by adding the coil voltage of the primary winding Tr1 to the full-wave rectified voltage of the rectifier circuit 20 is supplied to the primary capacitor C1.
  • an output voltage lower than the input voltage can be supplied to the LED series circuit 40.
  • the electrical energy is charged from the primary capacitor C1 to the secondary capacitor C2, and a current flows through the closed circuit of the LED series circuit 40 and the secondary capacitor C2.
  • the secondary capacitor C2 functions as a second output power source when the switching element Q is in an off state.
  • the fact that the current flowing through the primary winding Tr1 of the transformer Tr has become zero is detected by the secondary winding Tr2 of the transformer Tr and the zero current detector 38.
  • the zero current detector 38 detects that the current flowing through the primary winding Tr1 has become zero, the flip-flop 36 is set and the switching element Q is turned on.
  • the average value of the current flowing through the primary winding Tr1 of the transformer Tr becomes equal to the voltage waveform of the commercial AC power supply 11, and improvement of the power factor and suppression of harmonic current can be realized.
  • the LED series having a higher voltage specification than the voltage of the commercial AC power supply 11 is set.
  • the power supply circuit 10 suitable for driving the circuit 40 or driving the LED series circuit 40 having a lower voltage specification than the voltage of the commercial AC power supply 11 is obtained.
  • the output voltage of the multiplier 34 increases, and the pulse width of the pulse signal generated from the comparator 35 increases.
  • the on-time during which the switching element Q is on-controlled increases, and the amount of charge charged to the primary capacitor C1 increases.
  • the power supply circuit 10 that drives the LED series circuit 40 having a higher voltage specification than the voltage of the commercial AC power supply 11 can be effectively used.
  • the power supply circuit 10 that drives the LED series circuit 40 having a lower voltage specification than the voltage of the commercial AC power supply 11 can be effectively used.
  • FIG. 3 schematically shows another configuration example of the control IC.
  • the difference from the first embodiment is that the output voltage from the error amplifier 33 is supplied to the comparator 35 via the multiplier (MUL) 34 in the first embodiment.
  • MUL multiplier
  • the output voltage from the error amplifier 33 is directly supplied to the comparator 35.
  • symbol are attached
  • the control IC 31 in this modified example inputs the voltage converted by the resistors R9 and R10 to the inverting input terminal of the inverting amplifier 32, and applies the reference voltage Vref to the non-inverting input terminal of the error amplifier 33. input.
  • the output of the error amplifier 33 is compared with the voltage converted by the current detection resistor 4 of the switching element Q by the comparator 35.
  • the output of the comparator 35 is output via the flip-flop 36 and the driver 37, and drives the gate of the switching element Q.
  • the output of the comparator 35 is inverted to reset the flip-flop 36, and the switching element Q is turned off.
  • the flip-flop 36 is set and the switching element Q is turned on.
  • the voltage converted by the resistors R9 and R10 is supplied to the inverting input terminal of the inverting amplifier 32 and the inverting input terminal of the error amplifier 33 through the FB terminal of the control IC 31.
  • the present invention is not limited to this.
  • the voltage converted by the resistors R9 and R10 is input to the error amplifier 33 through the FB terminal of the control IC 31 without using the inverting amplifier 32 according to the polarity of the FB terminal of the control IC 31.
  • the structure which does may be sufficient.
  • FIG. 4 schematically shows a configuration example of the power supply circuit according to the second embodiment.
  • the substantially same members as those in the first embodiment are given the same member names and symbols. Therefore, a detailed description of substantially the same members as those in the first embodiment is omitted.
  • the power supply circuit 10 according to the second embodiment is different from the first embodiment in that a constant voltage power supply circuit is used as a power supply for the LED 41.
  • a series circuit composed of resistors R11 and R12 is connected in parallel to a constant voltage load composed of an LED series circuit 42 connected to a resistor R15 between output terminals of the power supply circuit 10.
  • a series circuit including resistors R13 and R14 is connected to a connection point between the resistors R11 and R12.
  • the inverting input terminal of the inverting amplifier 32 is connected to the connection point of the resistors R13 and R14.
  • the resistors R11 to R14 constitute a voltage detection circuit that detects a voltage applied to a constant voltage load.
  • the divided voltage value at the connection point of the resistors R13 and R14 is input to the FB terminal of the control IC 31 through the inverting amplifier 32.
  • the control IC 31 shown in FIG. 2 or 3 can be used effectively.
  • the voltage input to the FB terminal By setting the voltage input to the FB terminal to a predetermined value suitable for driving the LED series circuit 40 with respect to the reference voltage Vref of the error amplifier 33, an output lower than the input voltage is provided without providing an expensive circuit.
  • a voltage or a high output voltage can be supplied to the LED series circuit 40.
  • the voltage converted by the resistors R13 and R14 is input to the inverting input terminal of the inverting amplifier 32 and the inverting terminal of the error amplifier 33 through the FB terminal of the control IC 31.
  • the present invention is not limited to this.
  • the voltage converted by the resistors R13 and R14 is not converted to the voltage of the control IC 31 without using the inverting amplifier 32 according to the polarity of the FB terminal of the control IC 31.
  • the configuration may be such that the error amplifier 33 is input through the FB terminal.
  • the switching element Q when the switching element Q is on, electrical energy is accumulated based on the direct current from the rectifier circuit 20, and the direct current is output based on the accumulated electrical energy.
  • the configuration in which the single transformer Tr is provided in the power supply circuit as the storage circuit to be performed is illustrated, for example, a configuration in which a single coil is provided in the power supply circuit may be used.
  • the critical mode control method is illustrated in which the switching element Q is controlled to be turned on when the current flowing through the transformer Tr becomes zero. However, the current flowing through the transformer Tr is prevented from becoming zero.
  • the present invention can also be applied to a continuous current mode control system to be controlled, and the initial object of the present invention can be sufficiently achieved.
  • the power supply circuit of the illuminating device was illustrated, this invention is not limited to this.
  • the present invention can be effectively used as a power circuit for driving a DC motor such as an air conditioner, a refrigerator, a ventilation fan or a pump, for example.
  • a constant voltage load For example, it can be used as a general-purpose DC voltage power source. Therefore, the present invention is not limited to the above embodiments and modifications, and various design changes can be made within the scope described in each claim.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention a trait à un circuit d'énergie capable de fournir à une charge de courant continu une tension de sortie supérieure ou inférieure à une tension d'entrée grâce à une configuration de circuit simple et sans aucun montage de circuits spécial. Ce circuit d'énergie (10) est muni d'un circuit d'alimentation électrique possédant un transducteur (Tr), une diode de redressement (D1), un condensateur principal (C1) et un condensateur auxiliaire (C2), et d'un élément de commutation (Q). Un circuit série à LED (40) est entraîné par un courant continu provenant du condensateur principal (C1) lorsque l'élément de commutation (Q) est activé, et entraîné par un courant continu provenant du condensateur auxiliaire (C2) lorsque ledit élément de commutation (Q) est désactivé. Le condensateur principal (C1) est chargé par le transducteur (Tr) lorsque l'élément de commutation (Q) est désactivé.
PCT/JP2010/051352 2009-02-24 2010-02-01 Circuit d'énergie WO2010098174A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-040348 2009-02-24
JP2009040348A JP5616028B2 (ja) 2009-02-24 2009-02-24 電源回路

Publications (1)

Publication Number Publication Date
WO2010098174A1 true WO2010098174A1 (fr) 2010-09-02

Family

ID=42665384

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/051352 WO2010098174A1 (fr) 2009-02-24 2010-02-01 Circuit d'énergie

Country Status (2)

Country Link
JP (1) JP5616028B2 (fr)
WO (1) WO2010098174A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013094700A1 (fr) * 2011-12-20 2013-06-27 シチズンホールディングス株式会社 Module à del
US8723425B2 (en) 2011-06-17 2014-05-13 Stevan Pokrajac Light emitting diode driver circuit

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5645257B2 (ja) * 2010-11-18 2014-12-24 パナソニックＩｐマネジメント株式会社 半導体発光素子の点灯装置およびそれを用いた照明器具
JP6365162B2 (ja) * 2014-09-17 2018-08-01 東芝ライテック株式会社 電源装置および照明装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62221867A (ja) * 1986-03-13 1987-09-29 Fujitsu Ltd Ｄｃ−ｄｃコンバ−タ
JPH03226266A (ja) * 1990-01-31 1991-10-07 Mitsubishi Electric Corp パルス電源装置
JPH08168257A (ja) * 1994-12-15 1996-06-25 Cosel Usa Inc スイッチングレギュレータ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62221867A (ja) * 1986-03-13 1987-09-29 Fujitsu Ltd Ｄｃ−ｄｃコンバ−タ
JPH03226266A (ja) * 1990-01-31 1991-10-07 Mitsubishi Electric Corp パルス電源装置
JPH08168257A (ja) * 1994-12-15 1996-06-25 Cosel Usa Inc スイッチングレギュレータ

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8723425B2 (en) 2011-06-17 2014-05-13 Stevan Pokrajac Light emitting diode driver circuit
WO2013094700A1 (fr) * 2011-12-20 2013-06-27 シチズンホールディングス株式会社 Module à del
JP5312711B1 (ja) * 2011-12-20 2013-10-09 シチズンホールディングス株式会社 Ｌｅｄモジュール
JP2014078687A (ja) * 2011-12-20 2014-05-01 Citizen Holdings Co Ltd Ｌｅｄモジュール
US9508910B2 (en) 2011-12-20 2016-11-29 Citizen Holdings Co., Ltd. LED module
US9887185B2 (en) 2011-12-20 2018-02-06 Citizen Watch Co., Ltd. Packaging of LED chips and driver circuit on the same substrate

Also Published As

Publication number Publication date
JP5616028B2 (ja) 2014-10-29
JP2010200428A (ja) 2010-09-09

Similar Documents

Publication Publication Date Title
JP5796175B2 (ja) Ｌｅｄ点灯回路
US8890440B2 (en) Circuits and methods for driving light sources
US8680783B2 (en) Bias voltage generation using a load in series with a switch
TWI566506B (zh) 具有改良的功率因數和降低的能量儲存之升壓轉換器的前饋系統和方法
US8604707B2 (en) Power supply
JP4726609B2 (ja) 発光ダイオード駆動装置および発光ダイオード駆動用半導体装置
US9485819B2 (en) Single stage LED driver system, control circuit and associated control method
US9258858B2 (en) Active capacitor circuit
JP5603975B2 (ja) 定電流駆動ｌｅｄモジュール装置
US8742676B2 (en) Drive circuit for light emitting diode array based on sepic or cuk topology
US8760071B2 (en) Drive circuit for light emitting diode array based on a buck-boost topology
JP5077572B2 (ja) 発光ダイオード点灯装置
JP2012084489A (ja) Ｌｅｄ点灯装置およびｌｅｄ照明装置
JP2009302017A (ja) 発光ダイオード点灯装置および照明装置
GB2497213A (en) Circuits and methods for driving light sources
KR20110136537A (ko) 과전압 보호와 정전류 구동을 위한 ｌｅｄ 구동 회로 및 방법
JP5616028B2 (ja) 電源回路
JP5686218B1 (ja) 点灯装置および照明器具
JP6187024B2 (ja) Ｌｅｄ電源装置及びｌｅｄ照明装置
JP2013116003A (ja) 点灯装置
KR20090056025A (ko) 엘이디등 전원장치
JP5645303B2 (ja) リモート制御ワンコンバータ電源回路
US20100039842A1 (en) Power conversion system and power conversion method thereof
TWI384903B (zh) 光源驅動裝置
JP5182485B2 (ja) 電源回路及びその制御方法、プロジェクタ用電源回路並びにプロジェクタ

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10746055

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10746055

Country of ref document: EP

Kind code of ref document: A1