公开(公告)号：US5075836A

公开(公告)日：1991-12-24

申请号：US641808

申请日：1991-01-16

申请人： Yoshio Suzuki ,  Mikio Ito ,  Yasuo Kii ,  Ryoji Saito

发明人： Yoshio Suzuki ,  Mikio Ito ,  Yasuo Kii ,  Ryoji Saito

IPC分类号： H02M3/337

CPC分类号： H02M3/3376 ,  Y02B70/1433

摘要： A series resonant power converter in which a resonant copacitor is commonly used in a series resonant circuit and a parallel resonant circuit, whereby a capacitance of the resonant capacitor can be considerably decreased as compared with that of a tank circuit according to a prior art, so that an energy handled by the resonant capacitor can be decreased, which results in decreasing a size of the resonant circuit and also decreasing a power loss. The converter includes means for detecting and computing a voltage applied across a main switch means in its OFF-state and a control circuit for driving the main switch means to its ON-state when the detected and computed value of the voltage drops to a minimum voltage required to sustain oscillation of the series resonant circuit. The minimum voltage is computed by a detecting circuit for detecting an input voltage, a detecting circuit for detecting a voltage of a second resonant circuit and a detecting circuit for detecting a DC output voltage converted to a primary side of a main transformer.