WO1996008067A1 - Alimentation electrique a commutateur, du type a oscillateur auto-excite a protection contre les courants de surcharge - Google Patents

Alimentation electrique a commutateur, du type a oscillateur auto-excite a protection contre les courants de surcharge Download PDF

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Publication number
WO1996008067A1
WO1996008067A1 PCT/CN1995/000071 CN9500071W WO9608067A1 WO 1996008067 A1 WO1996008067 A1 WO 1996008067A1 CN 9500071 W CN9500071 W CN 9500071W WO 9608067 A1 WO9608067 A1 WO 9608067A1
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WO
WIPO (PCT)
Prior art keywords
power supply
circuit
self
positive feedback
coil
Prior art date
Application number
PCT/CN1995/000071
Other languages
English (en)
French (fr)
Inventor
Taktai Wong
Original Assignee
Taktai Wong
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 Taktai Wong filed Critical Taktai Wong
Priority to EP95929714A priority Critical patent/EP0802603B1/en
Priority to DE69529091T priority patent/DE69529091T2/de
Priority to JP50907896A priority patent/JP3485930B2/ja
Priority to US08/793,697 priority patent/US5903417A/en
Priority to RU97105031A priority patent/RU2146073C1/ru
Priority to CA002198096A priority patent/CA2198096C/en
Priority to AU33395/95A priority patent/AU693928B2/en
Publication of WO1996008067A1 publication Critical patent/WO1996008067A1/zh

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • 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
    • H02M3/338—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 in a self-oscillating arrangement
    • H02M3/3382—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 in a self-oscillating arrangement in a push-pull circuit arrangement
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • TECHNICAL FIELD The present invention relates to a self-excited switching power supply device with an over-current protection function.
  • TECHNICAL BACKGROUND A self-excited switching power supply is essentially a self-excited oscillator, when Output directly from the self-excited oscillation coil can be used as a high-frequency heating device, when rectified by the rectifier output can be used as a DC power supply device.
  • Self-excited switching power supply has the advantages of simple circuit, small size, low cost, etc., but due to the lack of a Simple and effective over-current protection method has poor stability and reliability, which makes self-excited switching power supply has not been a reliable and practical power supply device. Disclosure of the invention The object of the present invention is to provide an over-current protection A self-excited switching power supply device, which can simply and effectively overcome the shortcomings of poor stability and reliability of existing self-excited switching power supplies.
  • FIG. 1 is a schematic diagram of a general self-excited switching power supply device, which includes: a power supply 1, an amplifier 2, a self-excited oscillation coil 3, and a positive feedback coupling circuit 5.
  • the self-excited oscillation coil 3 further includes The main vibration coil La, the positive feedback coil Lb, and the output coil Lc.
  • FIG. 2 is a schematic diagram of the self-excited switching power supply device according to the present invention. In addition to the basic structure of FIG. 1, it is characterized in that the input of the amplifier 2 is The output common terminal A is connected with a current negative feedback impedance 4 that provides a DC path and contains a series resistance component.
  • the positive feedback voltage on the positive feedback coil Lb in 3 is similar.
  • the negative feedback voltage on the current negative feedback impedance 4 also increases to positive feedback.
  • the positive feedback voltage on the coil Lb is similar. Because the amount of positive feedback is insufficient, the oscillation circuit is forced to stop and achieve the purpose of overcurrent protection.
  • Figure 1 is a schematic diagram of a general self-excited switching power supply device
  • FIG. 2 is a schematic diagram of a self-excited switching power supply device according to the present invention.
  • FIG. 3 is a schematic circuit diagram of an embodiment of a self-excited switching power supply device according to the present invention.
  • FIG. 4 is a schematic circuit diagram of another embodiment of the self-excited switching power supply device according to the present invention.
  • a switching power supply device constructed according to the present invention, and the device includes: a power supply 1, amplifier 2, self-excited oscillation coil. 3, current negative feedback impedance 4, positive feedback coupling circuit 5, start-up circuit 6, secondary rectifier circuit 7.
  • Amplifier 2 uses a complementary amplifier pair consisting of two complementary amplifiers with a negative current feedback impedance 4 connected to the input and output terminals.
  • Oscillation coil 3 is composed of main oscillation coil La, positive feedback coil Lb, and output coil Lc.
  • Positive feedback coupling circuit 5 uses capacitor coupling, and positive feedback coil Lb is connected to the bridge excitation via the capacitor of positive feedback coupling circuit 5.
  • the terminal B constitutes a positive feedback circuit.
  • the starting circuit 6 is composed of an AC power supply connected to the bridge excitation terminal B via a current limiting resistor, and the output coil Lc is rectified by the secondary rectifier circuit 7 as a DC power supply output.
  • this full-bridge amplifier has no DC bias, the bridge circuit itself cannot start without an oscillator circuit.
  • an AC power supply is connected to the bridge circuit through the current limiting resistor of the oscillator circuit 6.
  • the excitation terminal B Under the action of the AC voltage, the voltage at point B changes, and the amplification of the bridge amplifier causes the voltage at both ends of the main vibration coil La to change.
  • the positive feedback of the positive feedback coil Lb causes the entire bridge to change. Road starts to vibrate. When the bridge starts to vibrate It is no longer affected by AC power, but oscillates at the natural frequency of the bridge.
  • the capacitor of the positive feedback coupling circuit 5 plays a differential role, thereby improving the excitation current waveform, which is beneficial to reduce the switching loss of the amplifier and improve the efficiency of the entire switching power supply.
  • the current of the amplifier 2 increases for more than a predetermined value for some reason Due to the negative feedback effect of the current negative feedback impedance 4, the positive feedback voltage of the positive feedback coil Lb is canceled, so that the amount of positive feedback is insufficient, so the oscillation stops and the purpose of overcurrent protection is achieved.
  • the bridge circuit starts. The vibrating circuit starts to vibrate again and resumes normal work.
  • the output of the output coil Lc of the self-excited oscillation coil 3 is rectified by the secondary rectifier circuit 7 and can be used as a DC power output.
  • FIG. 4 is another embodiment of the present invention, in which a complementary amplifier pair consisting of a P-channel and an N-channel FET amplifier is used as a half bridge, and the other half of the bridge is replaced by two capacitors 8 connected in series.
  • the principle is the same as in Figure 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Inverter Devices (AREA)

Description

带过流保护的自激式开关电源装置 所述技术领域 本发明涉及一种带过流保护功能的自激式开关电源装置. 技术背景 自激式开关电源实质上就是一个自激振荡器， 当直接由自激振荡 线圈输出吋可作为高频加热装置， 当经整流器整流输出时可作为一直 流电源装置. 自激式开关电源具有电路简单， 体积小， 成本低等优点， 但由于缺乏一种简单有效的过流保护方法 其稳定性和可靠性都较 差， 这使得自激式开关电源一直没有成为一种可靠实用的电源装置. 发明的公开 本发明的目的在于提供一种带过流保护的自激式开关电源装 置， 它能简单有效地克服现有自激式开关电源稳定性和可靠性差的缺 点.
本发明的目的是这样实现的. 图 1 是一般自激式开关电源装置的 原理图， 它包括： 电源 1 , 放大器 2 , 自激振荡线圈 3和正反馈耦合 电路 5 . 自激振荡线圈 3又包括主振线圈 La , 正反馈线圈 Lb和输出 线圈 Lc . 图 2是本发明所属自激式开关电源装置的原理图， 它除了具 有图 1的基本结构外， 其特征是， 在放大器 2的输人与输出公共端 A 加接有可提供直流通路、 含有串联电阻成分的电流负反馈阻抗 4 , 该 电流负反馈阻抗 4的阻抗值和预定的过电流保护点的电流值的乘积与 自激振荡线圈 3中的正反馈线圈 Lb上的正反馈电压相近. 当某种原因 使放大器 2的电流增大超过预定的电流值时， 电流负反馈阻抗 4上的 负反馈电压也跟着增大至与正反馈线圈 Lb上的正反馈电压相近， 由于 正反馈量不足， 迫使振荡电路停振， 达到过流保护的目的.
确认本 本发明只在原有装置中的放大器的输人与输出公共端加接电流 负反馈阻抗， 在几乎不增加装置成本和复杂性的基础上完全解决了过 流保护的问题. 图说明 以下对附图进行说明， 并结合实施例对本发明的具体结构及工作 情况作进一步说明.
图 1 是一般自激式开关电源装置的原理图；
图 2 是本发明自激式开关电源装置的原理图；
图 3 是本发明自激式开关电源装置的一个实施例的线路示意 图；
图 4 是本发明自激式开关电源装置的另一个实施例的线路示意 图. 实现本发明的最佳方式 参见图 3 ,图中示出按照本发明构成的一个开关电源装置， 该装置 包括： 电源 1 , 放大器 2 , 自激振荡线圈 . 3 , 电流负反馈阻抗 4， 正 反馈耦合电路 5 , 起振电路 6， 次级整流电路 7 .
1 10V交流电源经整流滤波后作为电源 1 . 放大器 2采用由两个输 人与输出公共端都加接有电流负反馈阻抗 4 的互补放大器组成互补放 大器对， 再由两个互补放大器对组成全桥式电路. 振荡线圈 3 由主振 线圈 La , 正反馈线圈 Lb , 输出线圈 Lc组成. 正反馈耦合电路 5 采用 电容器耦合， 由正反馈线圈 Lb经正反馈耦合电路 5 的电容器接至桥 路激励端 B组成正反馈电路. 起振电路 6由交流电源经限流电阻接至 桥路激励端 B组成， 输出线圈 Lc经次级整流电路 7整流后作为直流电 源输出.
本全桥式放大器由于没有直流偏置， 在没有起振电路的情况下， 桥路本身无法起振. 为了使桥路起振， 由交流电源经起振电路 6 的限 流电阻接至桥路的激励端 B .在交流电压作用下， B点电压产生变化， 经桥路放大器的放大作用使主振线圈 La两端的电压也 K着产生变 化， 由正反馈线圈 Lb的正反馈作用使整个桥路起振. 当桥路起振以后 就不再受交流电源影响， 而是按着桥路的固有频率振荡.
正反馈耦合电路 5的电容器起微分作用， 从而改善了激励电流波 形， 有利于降低放大器的开关损耗， 使整个开关电源的效率得以提高. 当某种原因使放大器 2 的电流增大超过预定值时， 由于电流负反 馈阻抗 4 的负反馈作用， 抵消了正反馈线圈 Lb的正反馈电压， 使正 反馈量不足， 于是振荡停止， 达到过流保护的目的. 当故障原因消失 后， 桥路在起振电路作用下再次起振， 恢复正常工作.
自激振荡线圈 3的输出线圈 Lc的输出经次级整流电路 7整流后， 可作为直流电源输出.
图 4 是本发明的另一个实施例， 其中由一个 P沟道和一个 N沟道 的场效应管放大器组成互补放大器对作为半个桥路， 另外半个桥路由 两个串联的电容器 8 代替， 其原理与图 3—样.

Claims

权 利 要 求 书
1 .一种带过流保护的自激式开关电源装置， 包括： 电源 （1 ), 放 大器 （2), 自激振荡线圈（3)， 正反馈耦合电路（5), 其特征是， 在放大 器（2) 的输入与输出公共端接有可提供直流通路、 含有串联电阻成分 的电流负反馈阻抗 (4)，该电流负反馈阻抗 （4)的阻抗值和预定的过流 保护点的电流值的乘积与所述自激振荡线圈（3 ) 中的正反馈线圈 Lb的 正反馈电压相近.
2.根据权利要求 1所述的电源装置， 其特征在于：
( 1 )所述电源（1 )为交流整流电源；
(2)所述放大器 (2)是由两个输入与输出公共端都接有所述电流负 反馈阻抗 （4)的互补放大器组成互补放大器对， 再由两个所述互补放 大器对组成全桥电路而构成， 或是由两个串联的电容器 （8)与一个所 述互补放大器对组成半桥电路而构成；
(3)所述正反馈耦合电路 (5)用电容器耦合，即由所述自激振荡线圈 (3)中的正反馈线圈 Lb经正反馈耦合电路（5)的电容器接到桥路激励端 (B)组成正反馈电路； 以及
(4)所述电源装置还包括一起振电路 (6),该电路由交流电源经限流 电阻接到所述桥路激励端 (B)组成.
PCT/CN1995/000071 1994-09-03 1995-08-30 Alimentation electrique a commutateur, du type a oscillateur auto-excite a protection contre les courants de surcharge WO1996008067A1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP95929714A EP0802603B1 (en) 1994-09-03 1995-08-30 Self-excitation type switch power supply unit with overcurrent protection
DE69529091T DE69529091T2 (de) 1994-09-03 1995-08-30 Schaltnetzteil mit selbsterregtem oszillator mit überstromschutz
JP50907896A JP3485930B2 (ja) 1994-09-03 1995-08-30 過電流保護付き自励型スイッチ電源ユニット
US08/793,697 US5903417A (en) 1994-09-03 1995-08-30 Self-excitation type switch power supply unit with overcurrent protection
RU97105031A RU2146073C1 (ru) 1994-09-03 1995-08-30 Импульсный блок питания самовозбуждающегося типа с защитой от перегрузки по току
CA002198096A CA2198096C (en) 1994-09-03 1995-08-30 A self-excited oscillator type switch power supply with overcurrent protection
AU33395/95A AU693928B2 (en) 1994-09-03 1995-08-30 A self-excited oscillator type switch power supply with overcurrent protection

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN94115838.1 1994-09-03
CN94115838 1994-09-03
CN94118055A CN1067187C (zh) 1994-09-03 1994-11-10 带过流保护的自激式开关电源装置
CN94118055.7 1994-11-10

Publications (1)

Publication Number Publication Date
WO1996008067A1 true WO1996008067A1 (fr) 1996-03-14

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PCT/CN1995/000071 WO1996008067A1 (fr) 1994-09-03 1995-08-30 Alimentation electrique a commutateur, du type a oscillateur auto-excite a protection contre les courants de surcharge

Country Status (9)

Country Link
US (1) US5903417A (zh)
EP (1) EP0802603B1 (zh)
JP (1) JP3485930B2 (zh)
KR (1) KR100386957B1 (zh)
CN (1) CN1067187C (zh)
AU (1) AU693928B2 (zh)
CA (1) CA2198096C (zh)
DE (1) DE69529091T2 (zh)
WO (1) WO1996008067A1 (zh)

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CN100454739C (zh) * 2004-05-18 2009-01-21 上海美芝欧加电器有限公司 一种自激式开关电源
JP4669306B2 (ja) * 2005-03-10 2011-04-13 三洋電機株式会社 擬似共振方式スイッチング電源装置及びそれを用いた擬似共振方式スイッチング電源回路

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Also Published As

Publication number Publication date
JP3485930B2 (ja) 2004-01-13
EP0802603A4 (en) 1999-12-15
EP0802603A1 (en) 1997-10-22
JPH10506519A (ja) 1998-06-23
DE69529091D1 (de) 2003-01-16
US5903417A (en) 1999-05-11
CA2198096A1 (en) 1996-03-14
KR970705862A (ko) 1997-10-09
CA2198096C (en) 2002-01-01
AU693928B2 (en) 1998-07-09
DE69529091T2 (de) 2003-04-30
KR100386957B1 (ko) 2003-08-19
EP0802603B1 (en) 2002-12-04
CN1067187C (zh) 2001-06-13
CN1118119A (zh) 1996-03-06
AU3339595A (en) 1996-03-27

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