WO2016171325A1 - Convertisseur indirect auquel est appliqué un élément de verrouillage actif auto-excité - Google Patents

Convertisseur indirect auquel est appliqué un élément de verrouillage actif auto-excité Download PDF

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Publication number
WO2016171325A1
WO2016171325A1 PCT/KR2015/007073 KR2015007073W WO2016171325A1 WO 2016171325 A1 WO2016171325 A1 WO 2016171325A1 KR 2015007073 W KR2015007073 W KR 2015007073W WO 2016171325 A1 WO2016171325 A1 WO 2016171325A1
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WO
WIPO (PCT)
Prior art keywords
node
flyback converter
switching element
capacitor
primary coil
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Application number
PCT/KR2015/007073
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English (en)
Korean (ko)
Inventor
김기남
사공왕규
박귀철
원재연
Original Assignee
주식회사 동아일렉콤
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Application filed by 주식회사 동아일렉콤 filed Critical 주식회사 동아일렉콤
Publication of WO2016171325A1 publication Critical patent/WO2016171325A1/fr

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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

Definitions

  • the present invention relates to a high efficiency flyback converter, and more particularly, to a flyback converter designed to autonomously drive an active clamp snubber circuit that has been driven conventionally.
  • the flyback converter is the circuit method of the most popular isolated switching mode power supply (SMPS). Flyback converters are typically used for low power below 150 [W] because they require only the smallest parts needed.
  • SMPS isolated switching mode power supply
  • the flyback converter uses the magnetizing inductor of the transformer as the energy storage element, and the stored energy is transferred to the secondary side of the transformer when the switch is turned off.
  • the energy stored in the leakage inductor cannot be delivered to the secondary side of the transformer and can cause voltage spikes that can damage the switch.
  • the use of MOSFETs in the high Vds range raises the price, and Rdson becomes larger, resulting in greater switching losses during the MOSFET turn-on period.
  • the snubber circuit can generally be divided into an RCD snubber as shown in FIG. 1 and an active clamp snubber as shown in FIG. 2.
  • the RCD snubber has a problem in that when the energy of the leakage inductance is charged by the snubber capacitor and discharged by the resistor, power loss due to heat is generated and efficiency is not improved.
  • Patent Document 1 Japanese Patent Laid-Open No. 2000-928259 discloses a switching power supply circuit that obtains an output current from a secondary coil of a transformer by periodically switching on / off the primary winding current of the transformer with a switching element.
  • An active clamp circuit which operates in the off period of the switching element to perform the voltage clamp of the primary coil, timing detection means for detecting a timing at which the applied voltage of the switching element is minimized, and timing detection for each operation termination of the active clamp circuit.
  • a switching power supply circuit having control means for determining an on timing of a switching element based on detection of the means.
  • Patent Document 1 should separately include a timing detecting means for detecting a timing at which the applied voltage of the switching element is minimum and a control means for determining on timing of the switching element, and a transformer for transmitting the control signal of the clamp element to the clamp element.
  • a circuit is installed, and this transformer circuit is composed of a number of components such as a buffer circuit, a transformer, and a plurality of resistors or capacitors, so that a constant insulation distance between the input and output circuits electrically separated through the transformer must be ensured.
  • miniaturization is impossible because it requires a constant insulating structure.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2000-92829
  • the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a flyback converter using a self-supporting active clamp that can perform an active clamp operation through a compact and inexpensive control circuit.
  • a flyback converter for achieving the above object has a first switching element connected to one end of the primary coil of the transformer and the ground side of the input power and one end and the other end of the primary coil of the transformer. With clamp circuit connected,
  • the first switching element is a MOSFET element, the drain of the first switching element is connected to one end of the primary coil, the source of the first switching element is connected to the ground side of the input power source,
  • the clamp circuit is composed of a second switching element, a first resistor, third to fifth diodes and third to fourth capacitors,
  • the second switching element is a MOSFET element, a source of the second switching element is connected to the first node, a drain is connected to the other end of the primary coil, and a gate is connected to the second node,
  • One end of a first resistor is connected to the first node and the other end is connected to a second node
  • the anode of the third diode is connected to the third node and the cathode is connected to the second node
  • the anode of the fourth diode is connected to the first node and the cathode is connected to the third node,
  • the anode of the fifth diode is connected to the second node and the cathode is connected to one end of the primary coil
  • One end of the third capacitor is connected to one end of the primary coil and the other end is connected to the third node,
  • One end of the fourth capacitor is connected to the third node and the other end is connected to the first node
  • the clamp circuit may be driven such that the second switching element is turned on when the voltage of the third node becomes higher than the voltage of the second node after the first switching element is turned off.
  • the clamp circuit may be driven such that the second switching device is turned on when the voltage of the third node is increased by the turn-on voltage of the third diode after the first switching device is turned off.
  • the capacity of the fourth capacitor may be greater than that of the third capacitor.
  • the first switching device may further include a first diode and a first capacitor parasitic.
  • the display device may further include a second diode and a second capacitor that are parasitic on the second switching device.
  • the clamp circuit can be composed of only a switching element and a passive element such as a diode, a capacitor, and a resistor.
  • the output ripple is reduced to enable stable power supply. According to the present invention, it is possible to provide a flyback converter capable of performing an active clamp operation in a compact and inexpensive manner as the surge is reduced and the reliability of the switching device can be secured, and the breakdown voltage margin can be secured.
  • FIG. 1 is a circuit diagram of a flyback converter using a conventional RCD snubber.
  • FIG. 2 is a circuit diagram of a flyback converter using a conventional active clamp.
  • FIG. 3 is a flyback converter applying a self-supporting active clamp according to an embodiment of the present invention.
  • FIG. 4A is a circuit diagram when the first switch of the flyback converter according to an embodiment of the present invention is turned on and the second switch is turned off.
  • 4B is a circuit diagram when the first switch of the flyback converter according to an embodiment of the present invention is turned off and the second switch is turned off.
  • 4C is a circuit diagram when the first switch of the flyback converter according to an embodiment of the present invention is turned off and the second switch is turned on.
  • FIG. 4 (d) is a circuit diagram when the first switch of the flyback converter according to an embodiment of the present invention is turned off and the second switch is turned off.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms may be used for the purpose of distinguishing one component from another component.
  • first component may be referred to as the second component, and similarly, the second component may be referred to as the first component.
  • each step may occur differently from the stated order unless the context clearly dictates the specific order. That is, each step may occur in the same order as specified, may be performed substantially simultaneously, or may be performed in the reverse order.
  • FIG. 3 is a flyback converter 100 applying a self-supporting active clamp according to an embodiment of the present invention.
  • the flyback converter 100 of FIG. 3 includes first switching elements S1 and 110 connected to one end 130a of the primary coil of the transformer and the ground side of the input power Vin, and one end of the primary coil of the transformer. And a clamp circuit 120 connected to the 130a and the other end 130b.
  • the first switching devices S1 and 110 are MOSFET devices, and may further include a first diode D1 and a first capacitor C1 connected in parallel between the drain and the source.
  • the first diode D1 and the first capacitor C1 may be parasitic in the MOSFET of the first switching device.
  • the clamp circuit 120 includes the second switching elements S2 and 121, the first resistor R1, the third to fifth diodes D3 to D5, and the third to fourth capacitors C3 to C4.
  • the second switching devices S2 and 121 are MOSFET devices and may further include a second diode D2 and a second capacitor C2 connected in parallel between the drain and the source.
  • the second diode D2 and the second capacitor C2 may be parasitic in the MOSFET of the second switching element.
  • a source of the second switching elements S2 and 121 is connected to the first node 122a, a drain is connected to the other end 130b of the primary coil of the transformer, and a gate is connected to the second node 122b.
  • One end of the first resistor R1 is connected to the first node 122a and the other end is connected to the second node 122b.
  • the anode of the third diode D3 is connected to the third node 122c and the cathode is connected to the second node 122b.
  • An anode of the fourth diode D4 is connected to the first node 122a and a cathode is connected to the third node 122c.
  • the anode of the fifth diode D5 is connected to the second node 122b and the cathode is connected to one end 130a of the primary coil of the transformer.
  • One end of the third capacitor C3 is connected to one end 130a of the primary coil of the transformer and the other end is connected to the third node 122c.
  • One end of the fourth capacitor C4 is connected to the third node 122c and the other end is connected to the first node 122a.
  • the first and second switching elements are not limited to the MOSFETs, and various switching elements such as an insulated gate bipolar transistor (IGBT), a bipolar junction transistor (BJT), and a TRIAC may be used.
  • IGBT insulated gate bipolar transistor
  • BJT bipolar junction transistor
  • TRIAC TRIAC
  • FIG. 4A is a circuit diagram when the first switch of the flyback converter according to an embodiment of the present invention is turned on and the second switch is turned off.
  • the input power Vin is applied to the first switch so that the first switch is turned on and current flows in the primary coil of the transformer. (The second switch is off.)
  • the second switching circuit is turned off (i.e., no input power is applied), and energy stored in the primary coil of the transformer is transferred to the secondary side of the transformer. do. At this time, the remaining current flows to the second switching element through the primary coil of the transformer and the third and fourth capacitors. (The second switch is off.)
  • the second switching element S2 may be turned on when the voltage of the third node 122c is increased by the turn-on voltage of the third diode D3 (about 0.7V). have.
  • the capacity of the fourth capacitor may be greater than that of the third capacitor.
  • the first switching circuit and the second switching circuit are controlled only by passive elements (i.e., resistors, capacitors, and diodes) without having a separate timing detection circuit or an on / off control circuit as in Patent Document 1. Therefore, a flyback converter capable of self-commuting and active clamping can be provided. In addition, a flyback converter can be provided that can perform active clamp operation in a compact and inexpensive manner.
  • the flyback converter according to the present invention can be used as a flyback converter to which a self-acting active clamp that can perform an active clamp operation can be used through a compact and inexpensive control circuit.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

La présente invention concerne un convertisseur indirect hautement efficace et, plus spécifiquement, un convertisseur indirect conçu de façon qu'un circuit d'amortissement et de verrouillage actif, qui a été excité de manière classique par excitation externe, est excité par auto-excitation.
PCT/KR2015/007073 2015-04-22 2015-07-08 Convertisseur indirect auquel est appliqué un élément de verrouillage actif auto-excité WO2016171325A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020150056405A KR20160125676A (ko) 2015-04-22 2015-04-22 자려식 액티브 클램프를 적용한 플라이백 컨버터
KR10-2015-0056405 2015-04-22

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WO2016171325A1 true WO2016171325A1 (fr) 2016-10-27

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10811986B2 (en) 2017-12-21 2020-10-20 Appulse Power Inc. Power converter with active clamp
WO2020222077A1 (fr) * 2019-05-02 2020-11-05 Silanna Asia Pte Ltd Verrouillage actif avec circuit d'amorçage
US11038412B2 (en) 2019-01-14 2021-06-15 Appulse Power Inc. Active clamp circuit
US11095228B2 (en) 2018-02-02 2021-08-17 Appulse Power Inc. Integrated self-driven active clamp

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004096981A (ja) * 2002-09-02 2004-03-25 Ohira Denshi Kk 部分共振型自励式スイッチング電源の低損失化回路
JP2005117852A (ja) * 2003-10-10 2005-04-28 Matsushita Electric Ind Co Ltd スイッチング電源装置
US20100067259A1 (en) * 2008-09-17 2010-03-18 Delta Electronics, Inc. Forward-flyback converter with active-clamp circuit
KR20120130501A (ko) * 2011-05-23 2012-12-03 박찬웅 플라이백 컨버터에서 트랜스포머의 리키지인덕턴스에 의해 발생되는 스파이크 전압을 억제하는 방법 및 장치
EP2736157A1 (fr) * 2011-07-21 2014-05-28 Santak Electronic (Shenzhen) Co., Ltd. Topologie de convertisseur cc-cc aller-retour ayant une grande efficacité et un faible coût

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000092829A (ja) 1998-09-07 2000-03-31 Hitachi Ltd スイッチング電源回路

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004096981A (ja) * 2002-09-02 2004-03-25 Ohira Denshi Kk 部分共振型自励式スイッチング電源の低損失化回路
JP2005117852A (ja) * 2003-10-10 2005-04-28 Matsushita Electric Ind Co Ltd スイッチング電源装置
US20100067259A1 (en) * 2008-09-17 2010-03-18 Delta Electronics, Inc. Forward-flyback converter with active-clamp circuit
KR20120130501A (ko) * 2011-05-23 2012-12-03 박찬웅 플라이백 컨버터에서 트랜스포머의 리키지인덕턴스에 의해 발생되는 스파이크 전압을 억제하는 방법 및 장치
EP2736157A1 (fr) * 2011-07-21 2014-05-28 Santak Electronic (Shenzhen) Co., Ltd. Topologie de convertisseur cc-cc aller-retour ayant une grande efficacité et un faible coût

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10811986B2 (en) 2017-12-21 2020-10-20 Appulse Power Inc. Power converter with active clamp
US11316436B2 (en) 2017-12-21 2022-04-26 Appulse Power Inc. Active clamp controller circuit
US11095228B2 (en) 2018-02-02 2021-08-17 Appulse Power Inc. Integrated self-driven active clamp
US11671026B2 (en) 2018-02-02 2023-06-06 Appulse Power Inc. Integrated self-driven active clamp
US11038412B2 (en) 2019-01-14 2021-06-15 Appulse Power Inc. Active clamp circuit
US11456657B2 (en) 2019-01-14 2022-09-27 Appulse Power Inc. Active clamp circuit
WO2020222077A1 (fr) * 2019-05-02 2020-11-05 Silanna Asia Pte Ltd Verrouillage actif avec circuit d'amorçage
US11152864B2 (en) 2019-05-02 2021-10-19 Silanna Asia Pte Ltd Active clamping with bootstrap circuit

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