CN2650393Y - 隔离式自振荡反激变换器 - Google Patents

隔离式自振荡反激变换器 Download PDF

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CN2650393Y
CN2650393Y CNU032745729U CN03274572U CN2650393Y CN 2650393 Y CN2650393 Y CN 2650393Y CN U032745729 U CNU032745729 U CN U032745729U CN 03274572 U CN03274572 U CN 03274572U CN 2650393 Y CN2650393 Y CN 2650393Y
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resistance
field effect
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尹向阳
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Mornsun Guangzhou Science and Technology Ltd
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Priority to CNU032745729U priority Critical patent/CN2650393Y/zh
Priority to PCT/CN2004/001000 priority patent/WO2005027331A1/zh
Priority to US10/567,668 priority patent/US7333353B2/en
Priority to DE112004001589T priority patent/DE112004001589T5/de
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/338—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
    • H02M3/3381—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 using a single commutation path

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

Abstract

本实用新型公开了一种隔离式自振荡反激变换器，包括耦合变压器、场效应管、晶极管和光电耦合隔离反馈器，电路输入端经耦合变压器的初级线圈连接场效应管的源极，电路输入端经电阻R1和电阻R2连接晶极管的集电极，场效应管的源极与晶极管的集电极连接，场效应管的漏极一路经电阻接地，另一路经电阻和电容的并联体连接晶极管的基极，晶极管的基极经光电耦合隔离反馈器连接耦合变压器的次级输出绕组的输出端；所述电阻R1和电阻R2之间的串接点经加速电容、耦合变压器的次级绕组接地；所述电路输入端和串接点之间连接有用于实现电路软启动的回路。本实用新型启动电流小，在输入电压较高时也能保持正常工作。

Description

隔离式自振荡反激变换器
技术领域
本实用新型涉及一种用于自振荡反激式电源模块中的隔离式自振荡反激变换器。
背景技术
现有的隔离式自振荡反激变换器包括耦合变压器、场效应管、振荡晶极管和光电耦合隔离器，如图1所示，当输入加上电压后，电流直接流过电阻R1、R2使场效应管TR1趋于导通，耦合变压器的初级线圈P1有电流流过，耦合作用使次级绕组P2的极性使得场效应管TR1进一步导通，次级绕组P2的正电压开始是通过加速电容C1、电阻R2传到场效应管TR1上，所以场效应管TR1的驱动电流波形前沿很陡，有利于其快速导通。场效应管TR1导通后，流经初级绕组P1、晶体管TR1的电流在电阻R4上引起压降，其上正下负的极性经电阻R3、电容C2使晶体管TR2导通。晶体管TR2导通后，使得场效应管TR1的栅极分流，场效应管TR1将关断。场效应管TR1关断后，流过其漏极的电流为零，从而电阻R4上的压降为零，晶体管TR2将关闭，场效应管TR1又重新导通。如此循环，电路将产生自激振荡。自激振荡工作后，此电路将进行反激。输出端通过光电耦合隔离器光敏三极管反馈来控制晶体管TR2基极上的电流，从而调节场效应管TR1、晶体管TR2的通断时间。这就是电路的反激过程。
由于上述电路中电压通过电阻R1、R2直接启动晶体管TR1，使得启动电流大；另外当输入电压较高时，在电压刚输入的瞬间，在电阻R1，R2上产生一个很大的瞬时电流尖峰，使晶体管瞬时导通，这一瞬时电流尖峰就有可能使晶体管被击穿，同时加在管子上的过高电压也会使晶体管损坏，也就会造成产品启动不良的问题。
实用新型内容
本实用新型的目的在于提供一种启动电流小，在输入电压较高时也能保持正常工作的隔离式自振荡反激变换器。
本实用新型的目的可通过以下的技术措施来实现：包括耦合变压器T、场效应管TR1、振荡晶极管TR2和光电耦合隔离反馈器OP，电路输入端经耦合变压器T的初级线圈P1连接场效应管TR1的源极，电路输入端经电阻R1和电阻R2连接晶极管TR2的集电极，场效应管TR1的源极与晶极管TR2的集电极连接，场效应管TR1的漏极一路经电阻R4接地，另一路经电阻R3和电容C2的并联体连接晶极管TR2的基极，晶极管TR2的基极经光电耦合隔离反馈器0P连接耦合变压器T的次级输出绕组P3的输出端；所述电阻R1和电阻R2之间的串接点A经加速电容C1、耦合变压器T的次级绕组P2接地；其特征在于所述电路输入端和串接点A之间连接有用于实现电路软启动的回路。
本实用新型所述的软启动回路由电阻R1、电阻R5和电容C3组成，电阻R5串接于所述电阻R1和串接点A之间，电容C3的一端连接于电阻R5和电阻R1之间，其另一端接地。
本实用新型所述的软启动回路由电阻R1和电感L组成，电阻R1和电感L串接于电路输入端和串接点A之间。
本实用新型与现有技术相比主要有以下优点：1、由于增设了软启动电路，使其启动电流小，不论是大负载还是容性负载都只产生很小的启动电流，可以大大改善该电路的启动特性；2、对输入电压无要求，在输入电压较高时此电路也能正常工作。
附图说明
图1为现有隔离式自振荡反激变换器的电路原理图；
图2为本实用新型实施例一的电路原理图；
图3本实用新型实施例二电路原理图。
具体实施方式
如图2所示，本实施1包括耦合变压器T、场效应管TR1、振荡晶极管TR2和光电耦合隔离反馈器OP，电路输入端经耦合变压器T的初级线圈P1连接场效应管TR1的源极，电路输入端经电阻R1和电阻R2连接晶极管TR2的集电极，场效应管TR1的源极与晶极管TR2的集电极连接，场效应管TR1的漏极一路经电阻R4接地，另一路经电阻R3和电容C2的并联体连接晶极管TR2的基极，晶极管TR2的基极经光电耦合隔离反馈器OP连接耦合变压器T的次级输出绕组P3的输出端；电阻R1和电阻R2之间的串接点A经加速电容C1、耦合变压器T的次级绕组P2接地；电阻R1和串接点A之间串接电阻R5，电容C3的一端连接于电阻R5和电阻R1之间，其另一端接地。
当电路输入端加上电压，经过电容C滤波后，电流流经电阻R1对电容C3充电；在电压刚输入的一小段时间内，由于电容C3处于充电状态，故这时场效应管TR1不会立即导通，从而也不会产生尖峰电流；只有当电容C3充电到一定电压，场效应管TR1才有可能导通，这个时间的长短可以通过对电容C3参数大小的选取来控制。当电容C3充电到一定时间后，晶极管TR2集电极的电压升高，即使得场效应管TR1的栅极电压变高，从而导通，其它方面的原理与图1相同。因此可以通过对电阻R1、R5以及电容C3参数大小的选择来控制晶体管在输入电流和电压稳定时再导通，从而可以大大改进该电路的启动特性。同时，此电路结构也可以确保加在场效应管TR1栅极、三极管TR2基极上的电压不会超过其极限值。
如图3所示，本实施例二与实施例一的组成及工作原理基本相同，不同之处在于软启动回路，该软启动回路由电阻R1和电感L组成，电阻R1和电感L串接于电路输入端和串接点A之间。输入电压先对电感L充电，当充电到一定时间后，电阻R2上的电流达到一定值时，三极管再导通，这样也可以达到软启动的效果，从而保护晶体管TR1、TR2，达到相同的效果。

Claims (3)

1、一种隔离式自振荡反激变换器，包括耦合变压器(T)、场效应管(TR1)、振荡晶极管(TR2)和光电耦合隔离反馈器(OP)，电路输入端经耦合变压器(T)的初级线圈(P1)连接场效应管(TR1)的源极，电路输入端经电阻(R1)和电阻(R2)连接晶极管(TR2)的集电极，场效应管(TR1)的源极与晶极管(TR2)的集电极连接，场效应管(TR1)的漏极一路经电阻(R4)接地，另一路经电阻(R3)和电容(C2)的并联体连接晶极管(TR2)的基极，晶极管(TR2)的基极经光电耦合隔离反馈器(OP)连接耦合变压器(T)的次级输出绕组(P3)的输出端；所述电阻(R1)和电阻(R2)之间的串接点(A)经加速电容(C1)、耦合变压器(T)的次级绕组(P2)接地；其特征在于：所述电路输入端和串接点(A)之间连接有用于实现电路软启动的回路。
2、根据权利要求1所述的隔离式自振荡反激变换器，其特征在于：所述的软启动回路由电阻(R1)、电阻(R5)和电容(C3)组成，电阻(R5)串接于所述电阻(R1)和串接点(A)之间，电容(C3)的一端连接于电阻(R5)和电阻(R1)之间，其另一端接地。
3、根据权利要求1所述的隔离式自振荡反激变换器，其特征在于：所述的软启动回路由电阻(R1)和电感(L)组成，电阻(R1)和电感(L)串接于电路输入端和串接点(A)之间。
CNU032745729U 2003-09-16 2003-09-16 隔离式自振荡反激变换器 Expired - Lifetime CN2650393Y (zh)

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CNU032745729U CN2650393Y (zh) 2003-09-16 2003-09-16 隔离式自振荡反激变换器
PCT/CN2004/001000 WO2005027331A1 (fr) 2003-09-16 2004-08-30 Convertisseur indirect auto-oscillant de type isolant
US10/567,668 US7333353B2 (en) 2003-09-16 2004-08-30 Isolating type self-oscillating flyback converter with a soft start loop
DE112004001589T DE112004001589T5 (de) 2003-09-16 2004-08-30 Getrennter selbstschwingender Sperrwandler

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CN101908819A (zh) * 2010-07-06 2010-12-08 北京新雷能科技股份有限公司 一种浪涌抑制电路
CN113364303A (zh) * 2021-08-10 2021-09-07 深圳英集芯科技股份有限公司 隔离反馈装置及电源设备

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CN100461603C (zh) * 2006-09-05 2009-02-11 广州金升阳科技有限公司 一种隔离式自振荡反激变换器
CN101908819A (zh) * 2010-07-06 2010-12-08 北京新雷能科技股份有限公司 一种浪涌抑制电路
CN101908819B (zh) * 2010-07-06 2012-09-19 北京新雷能科技股份有限公司 一种浪涌抑制电路
CN113364303A (zh) * 2021-08-10 2021-09-07 深圳英集芯科技股份有限公司 隔离反馈装置及电源设备

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US7333353B2 (en) 2008-02-19
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US20060209573A1 (en) 2006-09-21

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Granted publication date: 20041020