WO2014176721A1 - Régulateur, convertisseur abaisseur de tension et procédé de commande - Google Patents

Régulateur, convertisseur abaisseur de tension et procédé de commande Download PDF

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Publication number
WO2014176721A1
WO2014176721A1 PCT/CN2013/074939 CN2013074939W WO2014176721A1 WO 2014176721 A1 WO2014176721 A1 WO 2014176721A1 CN 2013074939 W CN2013074939 W CN 2013074939W WO 2014176721 A1 WO2014176721 A1 WO 2014176721A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
input voltage
output voltage
bus
regulator
Prior art date
Application number
PCT/CN2013/074939
Other languages
English (en)
Inventor
Egbert MAO
David Wang
Quentin LIN
Original Assignee
Tridonic Gmbh & Co Kg
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 Tridonic Gmbh & Co Kg filed Critical Tridonic Gmbh & Co Kg
Priority to PCT/CN2013/074939 priority Critical patent/WO2014176721A1/fr
Priority to GB1403157.9A priority patent/GB2514642A/en
Publication of WO2014176721A1 publication Critical patent/WO2014176721A1/fr

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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
    • H02M3/156—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 with automatic control of output voltage or current, e.g. switching regulators
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/462—Regulating voltage or current wherein the variable actually regulated by the final control device is dc as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • 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]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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]
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • This application relates to electrical converter, and in particular to a regulator, a buck converter and a controlling method.
  • FIG. 1 is a block diagram of a buck converter according to the prior art.
  • the buck converter is used to generate an output voltage (Vi ed ) from an input voltage (V bUS )-
  • a switch for example, an n-channel field- effect transistor
  • an inductor for example, an inductor
  • diode for example, a diode
  • capacitor for example, a capacitor
  • V bus and V ⁇ d may be too high when load (external device, such as LED) is changed in some scenario.
  • load external device, such as LED
  • the on-time of the switch will be reduced, and the reduced on-time will lose efficiency.
  • Embodiments of the present invention pertain to a regulator, a buck converter and a controlling method.
  • the objection of the invention is to keep the on-time of switch constant or approximately constant even though the load is variable.
  • a regulator for generating an output voltage (V ⁇ d ) from an input voltage (Vb US ), includes:
  • a buck converter configured to generate the output voltage (Vi ed ) by using the input voltage (V bus );
  • a controlling unit configured to adjust the input voltage (V bus ) according to the output voltage (Vi ed ), so as to keep the difference of the input voltage ( bus ) and the output voltage (Vi ed ) constant or approximately constant.
  • the buck converter includes:
  • a switch which comprises a first terminal and a second terminal; wherein the switch is turned ON or OFF depending on the voltage level of the input voltage (Vb US ) and the output voltage (Vi e d);
  • an inductor which comprises a third terminal and a fourth terminal; wherein the third terminal is electrically connected with the second terminal ;
  • a rectifier which comprises a fifth terminal and a sixth terminal; wherein the fifth terminal is electrically connected with the second terminal;
  • a capacitor which comprises a seventh terminal and a eighth terminal; wherein the seventh terminal is electrically connected with the fourth terminal, and the eighth terminal is electrically connected with the sixth terminal.
  • the first terminal is electrically coupled with the negative of the input voltage (V bus ); and, the eighth terminal and the sixth terminal is electrically coupled with the positive of the input voltage (V bUS )-
  • the rectifier is a diode; and the fifth terminal comprises an anode of the diode, and the sixth terminal comprises a cathode of the diode.
  • the first terminal is electrically coupled with the positive of the input voltage (V bus ); and, the eighth terminal and the sixth terminal is electrically coupled with the negative of the input voltage (V bus )-
  • the rectifier is a diode; and the fifth terminal comprises a cathode of the diode, and the sixth terminal comprises an anode of the diode.
  • the switch is an n-channel field- effect transistor, or a p-channel field-effect transistor.
  • a buck converter for generating an output voltage (ied) from an input voltage (Vb US ), includes:
  • a switch which comprises a first terminal and a second terminal; wherein the switch is turned ON or OFF depending on the voltage level of the input voltage (Vb US ) and the output voltage (Vi e d);
  • an inductor which comprises a third terminal and a fourth terminal; wherein the third terminal is electrically connected with the second terminal;
  • a rectifier which comprises a fifth terminal and a sixth terminal; wherein the fifth terminal is electrically connected with the second terminal;
  • a capacitor which comprises a seventh terminal and a eighth terminal; wherein the seventh terminal is electrically connected with the fourth terminal, and the eighth terminal is electrically connected with the sixth terminal;
  • a controller which is used to adjust the input voltage (V bUS ) according to the output voltage (Vi ed ), so as to keep the difference of the input voltage (V bus ) and the output voltage (Vi ed ) constant or approximately constant.
  • the first terminal is electrically coupled with the negative of the input voltage (V bus ); and the eighth terminal and the sixth terminal is electrically coupled with the positive of the input voltage (V bUS ).
  • the rectifier is a diode; and the fifth terminal comprises an anode of the diode, and the sixth terminal comprises a cathode of the diode.
  • the switch is an n-channel field- effect transistor, or a p-channel field-effect transistor.
  • a controlling method applied in a regulator or a buck converter for generating an output voltage (V ⁇ d ) from an input voltage (V bus ) 5 the method includes:
  • a computer-readable program wherein when the program is executed in a regulator or a buck converter, the program enables the computer to carry out the controlling method.
  • a storage medium in which a computer-readable program is stored, wherein the computer-readable program enables the computer to carry out the controlling method.
  • the advantages of the present invention exist in that: the difference of the input voltage (V bUS ) and the output voltage (Vi ed ) is constant or approximately constant by using the controlling unit.
  • the on-time of the switch will be constant or approximately constant even though the load is variable, and the efficiency can be improved.
  • Figure 1 is a block diagram of a buck converter according to the prior art
  • FIG. 2 is a schematic diagram of the regulator in accordance with an embodiment of the present invention.
  • FIG. 3 is another schematic diagram of the regulator in accordance with an embodiment of the present invention.
  • FIG. 4 is another schematic diagram of the regulator in accordance with an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of the buck converter in accordance with an embodiment of the present invention.
  • FIG. 6 is a flowchart of the controlling method in accordance with an embodiment of the present invention.
  • the on- time (t on ) of the switch can be calculated by the following formula:
  • the on-time of the switch is related to the difference of the V bus and V ⁇ .
  • Vi ed may be changed if the load is changed, that is to say, for variable led load, Vi ed is variable.
  • Vi ed is detected to control bus voltage and the on-time of the switch.
  • This embodiment of the present invention provides a regulator for generating an output voltage (Vi ed ) from an input voltage (V bus )-
  • Figure 2 is a schematic diagram of the regulator in accordance with an embodiment of the present invention.
  • the regulator 100 includes: a buck converter 101 and a controlling unit 102. Other parts of the regulator 100 can refer to the existing technology and not be described in the present application.
  • the buck converter 101 is configured to generate the output voltage (Vi ed ) by using the input voltage (V bus ); the controlling unit 102 is configured to adjust the input voltage (V bUS ) according to the output voltage ( ied), so as to keep the difference of the input voltage (Vb US ) and the output voltage (Vi ed ) constant or approximately constant.
  • the load may be LED.
  • One LED can be seen as a constant voltage cell, and Vi ed may be different for different load.
  • the difference of the input voltage (V bUS ) and the output voltage (Vi ed ) is constant or approximately constant by using the controlling unit 102.
  • the on- time of the switch will be constant or approximately constant even though the load is variable.
  • FIG. 3 is another schematic diagram of the regulator in accordance with an embodiment of the present invention.
  • the buck converter 101 may include: a switch 201, an inductor 202, a rectifier 203 and a capacitor 204.
  • the switch 201 has a first terminal 2011 and a second terminal 2012; the switch 201 is turned ON or OFF depending on the voltage level of the input voltage (Vb US ) and the output voltage (Vi e d);
  • the inductor 202 has a third terminal 2021 and a fourth terminal 2022; wherein the third terminal 2021 is electrically connected with the second terminal 2012;
  • the rectifier 203 has a fifth terminal 2031 and a sixth terminal 2032; wherein the fifth terminal 2031 is electrically connected with the second terminal 2012;
  • the capacitor 204 has a seventh terminal 2041 and a eighth terminal 2042; wherein the seventh terminal 2041 is electrically connected with the fourth terminal 2022, and the eighth terminal 2042 is electrically connected with the sixth terminal 2032.
  • the first terminal 2011 is electrically coupled with the negative of the input voltage (V bus ); and, the eighth terminal 2042 and the sixth terminal 2032 is electrically coupled with the positive of the input voltage (V bus ).
  • the rectifier (203) may be a diode; and the fifth terminal 2031 includes an anode of the diode, and the sixth terminal 2032 includes a cathode of the diode.
  • the switch 201 may be an n-channel field- effect transistor, a p-channel field-effect transistor, a NPN bipolar transistor or may be PNP bipolar transistor. However it is not limited thereto, and particular implement entity may be determined as actually required.
  • the on-time of the switch is defined by the voltage of (Vb US - Vied).
  • the voltage of (Vb US - Vi e d) is equal to the voltage of Vi e d- So the voltage of V ⁇ - can be used to control Vb US -
  • buck efficiency may be improved by detecting Vi ed - and setting V bus , so as to keep the on-time of the switch constant in LED driver application.
  • the setting of V bUS may also depend on the Ii ed , as may be selected by the user, e.g. by a DIP-switch, and such as from 350mA to 1050mA.
  • FIG. 4 is another schematic diagram of the regulator in accordance with an embodiment of the present invention.
  • the buck converter 101 may include: a switch 201, an inductor 202, a rectifier 203 and a capacitor 204.
  • the switch 201 has a first terminal 2011 and a second terminal 2012; the switch 201 is turned ON or OFF depending on the voltage level of the input voltage (Vb US ) and the output voltage (Vi e d);
  • the inductor 202 has a third terminal 2021 and a fourth terminal 2022; wherein the third terminal 2021 is electrically connected with the second terminal 2012;
  • the rectifier 203 has a fifth terminal 2031 and a sixth terminal 2032; wherein the fifth terminal 2031 is electrically connected with the second terminal 2012;
  • the capacitor 204 has a seventh terminal 2041 and a eighth terminal 2042; wherein the seventh terminal 2041 is electrically connected with the fourth terminal 2022, and the eighth terminal 2042 is electrically connected with the sixth terminal 2032.
  • the first terminal 2011 is electrically coupled with the positive of the input voltage (V bUS ); and, the eighth terminal 2042 and the sixth terminal 2032 is electrically coupled with the negative of the input voltage (Vbus).
  • the rectifier 203 is a diode; and the fifth terminal 2031 includes a cathode of the diode, and the sixth terminal 2032 includes an anode of the diode.
  • the switch 201 may be an n-channel field- effect transistor, or may be a p-channel field-effect transistor. However it is not limited thereto, and particular implement entity may be determined as actually required.
  • the switch 201 may be alternatively arranged on high potential at the input of the converter as well, meaning that the switch 201 can be coupled to the first terminal 2011 which is electrically coupled with the positive of the input voltage (V bUS )-
  • the difference of the input voltage (V bUS ) and the output voltage (Vi ed ) is constant or approximately constant by using the controlling unit.
  • the on-time of the switch will be constant or approximately constant even though the load is variable, and the efficiency may be improved.
  • This embodiment of the present invention provides a buck converter for generating an output voltage (Vi ed ) from an input voltage (V bus )- This embodiment is based on the embodiment 1 and the same content will not be described.
  • FIG. 5 is a schematic diagram of the buck converter in accordance with an embodiment of the present invention.
  • the buck converter 300 includes: a switch 301, an inductor 302, a rectifier 303, a capacitor 304 and a controller 305.
  • the switch 301 has a first terminal 3011 and a second terminal 3012; the switch 301 is turned ON or OFF depending on the voltage level of the input voltage (Vb US ) and the output voltage (Vied);
  • the inductor 302 has a third terminal 3021 and a fourth terminal 3022; wherein the third terminal 3021 is electrically connected with the second terminal 3012;
  • the rectifier 303 has a fifth terminal 3031 and a sixth terminal 3032; wherein the fifth terminal 3031 is electrically connected with the second terminal 3012;
  • the capacitor 304 has a seventh terminal 3041 and a eighth terminal 3042; wherein the seventh terminal 3041 is electrically connected with the fourth terminal 3022, and the eighth terminal 3042 is electrically connected with the sixth terminal 3032;
  • the controller 305 is used to adjust the input voltage (V bUS ) according to the output voltage (V ⁇ d ), so as to keep the difference of the input voltage (V bus ) and the output voltage (Vi ed ) constant or approximately constant.
  • the first terminal 3011 is electrically coupled with the negative of the input voltage (V bus ); and, the eighth terminal 3042 and the sixth terminal 3032 is electrically coupled with the positive of the input voltage (Vbus).
  • the rectifier 303 is a diode; and the fifth terminal 3031 includes an anode of the diode, and the sixth terminal 3032 includes a cathode of the diode.
  • the switch 301 is an n-channel field- effect transistor, or a p-channel field-effect transistor. However it is not limited thereto, and particular implement entity may be determined as actually required.
  • the difference of the input voltage (V bus ) and the output voltage (V kd ) is constant or approximately constant by using the controller.
  • the on-time of the switch will be constant or approximately constant even though the load is variable, and the efficiency may be improved.
  • This embodiment of the present invention provides a controlling method, applied in a regulator 100 or a buck converter 300 for generating an output voltage (Vi ed ) from an input voltage (V bUS ).
  • This embodiment is based on the embodiment 1 or 2, and the same content will not be described.
  • Figure 6 is a flowchart of the controlling method in accordance with an embodiment of the present invention. As shown in Figure 6, the method includes:
  • Step 601 detecting the output voltage (Vi ed ), wherein the output voltage ( i ed ) is variable for different external devices;
  • Step 602 adjusting the input voltage (V bUS ) according to the output voltage (Vi ed ), so as to keep the difference of the input voltage (V bUS ) and the output voltage (Vi ed ) constant or approximately constant.
  • the difference of the input voltage (V bUS ) and the output voltage (Vi ed ) is constant or approximately constant, by detecting the output voltage and adjusting the input voltage.
  • the on- time of the switch will be constant or approximately constant even though the load is variable, and the efficiency may be improved.
  • the invention is not limited to a buck converter.
  • the regulator may be formed by another type of switch mode converter, e.g. by a boost converter or a buck-boost converter.
  • the buck converter is only one example which has been explained as one variant of a regulator in detail.
  • This embodiment of the present invention also provides a computer-readable program, wherein when the program is executed in a regulator or a buck converter, the program enables the computer to carry out the controlling method.
  • This embodiment of the present invention also provides a storage medium in which a computer-readable program is stored, wherein the computer-readable program enables the computer to carry out the controlling method in a regulator or a buck converter.
  • logic and/or steps shown in the flowcharts or described in other manners here may be, for example, understood as a sequencing list of executable instructions for realizing logic functions, which may be implemented in any computer readable medium, for use by an instruction executing system, device or apparatus (such as a system including a computer, a system including a processor, or other systems capable of extracting instructions from an instruction executing system, device or apparatus and executing the instructions), or for use in combination with the instruction executing system, device or apparatus.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un régulateur, un convertisseur abaisseur de tension et un procédé de commande. Le régulateur comprend : un convertisseur (101) abaisseur de tension, conçu pour générer une tension (Vled) de sortie à l'aide d'une tension (Vbus) d'entrée; une unité (102) de commande, conçue pour ajuster la tension d'entrée en fonction de la tension de sortie, afin de maintenir constante ou approximativement constante la différence entre la tension d'entrée et la tension de sortie. Dans le régulateur, le temps d'activité du commutateur sera constant ou approximativement constant, même si la charge est variable, et l'efficacité peut être améliorée.
PCT/CN2013/074939 2013-04-28 2013-04-28 Régulateur, convertisseur abaisseur de tension et procédé de commande WO2014176721A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2013/074939 WO2014176721A1 (fr) 2013-04-28 2013-04-28 Régulateur, convertisseur abaisseur de tension et procédé de commande
GB1403157.9A GB2514642A (en) 2013-04-28 2014-02-21 Regulator, converter and controlling method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/074939 WO2014176721A1 (fr) 2013-04-28 2013-04-28 Régulateur, convertisseur abaisseur de tension et procédé de commande

Publications (1)

Publication Number Publication Date
WO2014176721A1 true WO2014176721A1 (fr) 2014-11-06

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PCT/CN2013/074939 WO2014176721A1 (fr) 2013-04-28 2013-04-28 Régulateur, convertisseur abaisseur de tension et procédé de commande

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GB (1) GB2514642A (fr)
WO (1) WO2014176721A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020131224A1 (en) * 2001-01-31 2002-09-19 Matsushita Electric Industrial Co., Ltd. Switching power supply apparatus
US20100067270A1 (en) * 2008-09-15 2010-03-18 Power Integrations, Inc. Method and apparatus to reduce line current harmonics from a power supply
CN102237792A (zh) * 2010-04-30 2011-11-09 美芯晟科技（北京）有限公司 一种恒流系统的电压补偿电路
US20110304309A1 (en) * 2010-06-11 2011-12-15 Sanken Electric Co., Ltd. Switching power source apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102299626A (zh) * 2010-06-24 2011-12-28 飞思卡尔半导体公司 用于直流至直流变换的方法和装置
EP2538753A1 (fr) * 2011-06-21 2012-12-26 Helvar Oy Ab Dispositif de commande pour DEL et procédé pour la fourniture de courant électrique à des DEL

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020131224A1 (en) * 2001-01-31 2002-09-19 Matsushita Electric Industrial Co., Ltd. Switching power supply apparatus
US20100067270A1 (en) * 2008-09-15 2010-03-18 Power Integrations, Inc. Method and apparatus to reduce line current harmonics from a power supply
CN102237792A (zh) * 2010-04-30 2011-11-09 美芯晟科技（北京）有限公司 一种恒流系统的电压补偿电路
US20110304309A1 (en) * 2010-06-11 2011-12-15 Sanken Electric Co., Ltd. Switching power source apparatus

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GB201403157D0 (en) 2014-04-09
GB2514642A (en) 2014-12-03

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