CN101409509B - 一种正反激式开关电源电路 - Google Patents

一种正反激式开关电源电路 Download PDF

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CN101409509B
CN101409509B CN2008102029865A CN200810202986A CN101409509B CN 101409509 B CN101409509 B CN 101409509B CN 2008102029865 A CN2008102029865 A CN 2008102029865A CN 200810202986 A CN200810202986 A CN 200810202986A CN 101409509 B CN101409509 B CN 101409509B
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secondary coil
terminal
anode
switch transformer
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CN101409509A (zh
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葛铮
李亮
杨元佳
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Shanghai Huajian Switch Co., Ltd.
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Shanghai Youchang Electric Power Technology Co ltd
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Abstract

本发明涉及一种正反激式开关电源电路，该电路包括开关变压器、二极管I、二极管II、二极管III、二极管IV、电容，所述的开关变压器的次级线圈的3端及4端分别与初级线圈的1端为同名端，所述的二极管I的阴极与开关变压器的次级线圈的3端连接，阳极与电容的负端连接；所述的二极管II阳极与开关变压器的次级线圈的3端连接，阴极与电容的正端连接；所述的二极管III的阴极与开关变压器的次级线圈的4端连接，阳极与电容的负端连接；所述的二极管IV的阳极与开关变压器的次级线圈的5端连接，阴极与电容的正端连接；所述的电容并联在电路输出端的两端。本发明的优点为开关电源上采用了正激反激方式，提高了充电效率，减少了充电器耗电量。

Description

一种正反激式开关电源电路
技术领域
本发明涉及充电技术领域，尤其涉及一种正反激式开关电源电路。
背景技术
当前的铅酸蓄电池充电机都以三段充电式或者小电流恒流充电，这种充电器结构虽然结构简单，但其充电时间过长，最起码8个小时以上，其原因为其充电电流值设定的都比较小，导致充电时间太长。
发明内容
本发明的目的就是为了克服上述现有技术存在的缺陷，提供一种充电时间短的正反激式开关电源电路。
本发明的目的可以通过以下技术方案来实现：一种正反激式开关电源电路，其特征在于，该电路包括开关变压器、二极管I、二极管II、二极管III、二极管IV、电容，所述的二极管I的阴极与开关变压器的次级线圈正极连接，阳极与电路的负输出端连接；所述的二极管II阳极与开关变压器的次级线圈正极连接，阴极与电路的正输出端连接；所述的二极管III的阴极接在开关变压器的次级线圈中部，阳极与电路的负输出端连接；所述的二极管IV的阳极与开关变压器的次级线圈负极连接，阴极与电路的正输出端连接；所述的电容并联在电路输出端的两端。
电路分正向激励和反向激励：
正向激励时，开关变压器1端为正，次级同名端3端也为正，对应的4端为负。此时二极管II、二极管III导通，次级线圈的3端和4端的能量储存在电容中
反向激励时，开关变压器1端为负，次级同名端3端也为负，对应的5端为正。此时二极管II、二极管III关断，二极管I、二极管IV导通，次级线圈的3端和5端的能量储存在电容中，有效的利用了开关变压器磁芯中泄放的能量。
与现有技术相比，本发明的优点在于在开关电源上采用了正激反激方式，这样可以使电能充分利用，提高充电效率，正激时，电网的能量直接储存在电容里，反激时使电感内储存的能量有效的加以利用，减少了充电器耗电量，这种电路对电容充电的全过程无稳压要求，只对上限电压加以控制。
附图说明
图1是本发明一种正反激式开关电源电路的结构图。
具体实施方式
如图1所示，一种正反激式开关电源电路，该电路包括开关变压器T、二极管I D1、二极管II D2、二极管IIID3、二极管IVD4、电容C，所述的二极管I D1的阴极与开关变压器T的次级线圈正极连接，阳极与电路的负输出端B连接；所述的二极管II D2阳极与开关变压器T的次级线圈正极连接，阴极与电路的正输出端A连接；所述的二极管IIID3的阴极接在开关变压器T的次级线圈中部，阳极与电路的负输出端B连接；所述的二极管IVD4的阳极与开关变压器T的次级线圈负极连接，阴极与电路的正输出端A连接；所述的电容C并联在电路的输出端两边。
本发明包含电感线圈T、正激回路(D2-D3)、反激回路(D4-D1)，由开关管将能量以高频打入电感线圈T中，正激时用次级线圈的3端和4端；对电容充电；反激时用次级线圈的3端和5端，3端到5端的匝数是3端到4端匝数的两倍，对同样的输出负载来说，能充分的释放磁芯中储存的能量，并把能量转化到电容里，这样可以避免磁饱和，减少功率管故障率。

Claims (1)

1.一种正反激式开关电源电路，其特征在于，该电路包括开关变压器(T)、二极管Ⅰ(D1)、二极管Ⅱ(D2)、二极管Ⅲ(D3)、二极管Ⅳ(D4)、电容(C)，所述的开关变压器(T)的次级线圈的3端及4端分别与初级线圈的1端为同名端，所述的二极管Ⅰ(D1)的阴极与开关变压器(T)的次级线圈的3端连接，阳极与电容(C)的负端连接；所述的二极管Ⅱ(D2)阳极与开关变压器(T)的次级线圈的3端连接，阴极与电容(C)的正端连接；所述的二极管Ⅲ(D3)的阴极与开关变压器(T)的次级线圈的4端连接，阳极与电容(C)的负端连接；所述的二极管Ⅳ(D4)的阳极与开关变压器(T)的次级线圈的5端连接，阴极与电容(C)的正端连接；所述的电容(C)并联在电路输出端的两端；次级线圈的两端点分别为3端和5端，次级线圈的中部抽头端为4端。
CN2008102029865A 2008-11-19 2008-11-19 一种正反激式开关电源电路 Active CN101409509B (zh)

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Citations (3)

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Publication number Priority date Publication date Assignee Title
CN1545195A (zh) * 2003-11-19 2004-11-10 南京航空航天大学 正反激双向dc-dc变换器
EP0622891B1 (en) * 1993-04-29 2006-07-26 AT&T Corp. Low loss synchronous rectifier for application to clamped-mode power converters
CN201312263Y (zh) * 2008-11-19 2009-09-16 上海优昌电源科技有限公司 一种正反激式开关电源电路

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0622891B1 (en) * 1993-04-29 2006-07-26 AT&T Corp. Low loss synchronous rectifier for application to clamped-mode power converters
CN1545195A (zh) * 2003-11-19 2004-11-10 南京航空航天大学 正反激双向dc-dc变换器
CN201312263Y (zh) * 2008-11-19 2009-09-16 上海优昌电源科技有限公司 一种正反激式开关电源电路

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