公开(公告)号：US20080055942A1

公开(公告)日：2008-03-06

申请号：US11780873

申请日：2007-07-20

申请人： Hong-Shan TAO ,  Hong-Jian Gan ,  Jian-Ping YING

发明人： Hong-Shan TAO ,  Hong-Jian Gan ,  Jian-Ping YING

IPC分类号： H02M3/315

CPC分类号： H02M3/3376 ,  H02M3/33592 ,  Y02B70/1475 ,  Y02P80/112

摘要： A resonance converter and a synchronous rectification driving method thereof are provided. The resonance converter includes a switch circuit having at least two first switches, a resonance circuit having a resonance frequency, a transformer, and a full-wave rectification circuit having two second switches each of which has a drain and a source and generates a channel resistance voltage when a current flows through the drain and the source. The synchronous rectification driving method includes steps as follow. When an operating frequency of the resonance converter is less than the resonance frequency and the resonance converter is coupled to a heavy load, the channel resistance voltage is compared with a reference voltage for driving the second switches of the full-wave rectification circuit; and when the operating frequency of the resonance converter is not smaller than the resonance frequency, duplicated signals of signals used to drive the first switches are respectively used to drive the second switches of the full-wave rectification circuit.

摘要翻译： 提供一种谐振变换器及其同步整流驱动方法。 谐振转换器包括具有至少两个第一开关的开关电路，具有谐振频率的谐振电路，变压器和具有两个第二开关的全波整流电路，每个开关具有漏极和源极，并产生沟道电阻 电流流过漏极和源极时的电压。 同步整流驱动方法包括以下步骤。 当谐振转换器的工作频率小于谐振频率并且谐振转换器耦合到重负载时，将沟道电阻电压与用于驱动全波整流电路的第二开关的参考电压进行比较; 并且当谐振转换器的工作频率不小于谐振频率时，用于驱动第一开关的信号的复制信号分别用于驱动全波整流电路的第二开关。