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1. 发明授权

US08649190B2 Power converter having high efficiency at low load 有权
标题翻译：功率转换器在低负载下具有高效率
公开(公告)号：US08649190B2
公开(公告)日：2014-02-11
申请号：US13104803
申请日：2011-05-10
申请人： Lien-Hsing Chen , Li-Hao Liu
发明人： Lien-Hsing Chen , Li-Hao Liu
IPC分类号： H02M3/335
CPC分类号： H02M3/33592 , H02M2001/0032 , Y02B70/1475 , Y02B70/16
摘要： A power converter includes a DC power source, a transformer having a first winding, a first MOSFET and a PWM controller at the primary side and a second winding, a drive control unit, a current detection control unit, a comparator and a second MOSFET at the secondary side. The comparator has its input end electrically connected to the current detection control unit and its output end electrically connected to the drive control unit, which is electrically connected to the second MOSFET for synchronous rectification. The second MOSFET is electrically connected to one end of the second winding, having a body diode built therein. The second winding and the second MOSFET constitute a combination circuit electrically connected to a load that has a capacitor electrically connected thereto in a parallel manner. By means of the aforesaid arrangement, conduction loss at a low load is minimized, thereby improving the efficiency at a low load.
摘要翻译：电力转换器包括直流电源，具有第一绕组的变压器，初级侧的第一MOSFET和PWM控制器以及第二绕组，驱动控制单元，电流检测控制单元，比较器和第二MOSFET，二次侧。比较器的输入端电连接到电流检测控制单元，其输出端电连接到驱动控制单元，驱动控制单元电连接到用于同步整流的第二MOSFET。第二MOSFET电连接到第二绕组的一端，其中内置有体二极管。第二绕组和第二MOSFET构成电连接到具有与之并联的电容器的负载的组合电路。通过上述布置，低负载下的导通损耗最小化，从而提高了低负载时的效率。

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