公开(公告)号：EP1071199A2

公开(公告)日：2001-01-24

申请号：EP00115770.0

申请日：2000-07-21

申请人： SHINDENGEN ELECTRIC MANUFACTURING COMPANY, LIMITED

发明人： Matsuda, Yoshiaki, Shindengen Electric Man Co Ltd. ,  Endo, Taisuke, Shindengen Electric Man Co Ltd.

IPC分类号： H02M3/337

CPC分类号： H02M3/337 ,  H02M3/33592 ,  H02M7/5236 ,  H02M2001/0048 ,  Y02B70/1475 ,  Y02B70/1491

摘要： There is provided a switching power supply having low loss.
In a power supply of the present invention, two sub switching elements (101a, 101b; 301a, 301b) connected in series are then connected in parallel with a bridge cicruit (110; 310), and a resonance coil (108; 308) and a sub primary winding (106) or an auxiliary primary winding are connected between a connection point (C; F) of the series connection circuits and an output terminal (B; E) of the bridge ciruit (110. 310). Resonance capacitors (113a, 113b, 114a, 114b; 313a, 313b, 314a, 314b) are respectively connected in parallel with each main switching element (111a, 111b, 112a, 112b; 311a, 311b, 312a, 312b) constituting the bridge circuit (310), so as to resonate with the resonance coil (108; 308). Voltage across the two ends of A phase and B phase sub secondary windings (107a, 107b) magnetically coupled to the sub primary winding (106) are clamped to the supply voltage, a fixed voltage in proportion to the turns ratio is generated in the sub primary winding (106), a voltage applied to the resonance coil (109) becomes small and current fluctuation becomes small. In the other embodiment the auxiliary primary winding (306) is magnetically coupled to a main primary winding (331) H-bridge connected to the main bridge circuit (310), wherein the main bridge circuit (310) is controlled during resonance of the resonance coil (308), and the resonance is terminated using a voltage induced in the auxiliary primary winding (306).

摘要翻译： 提供了具有低损耗的开关电源。 在本发明的电源中，串联连接的两个副开关元件（101a，101b，301a，301b）与桥式电容器（110; 310）和谐振线圈（108; 308）和 副串联（106）或辅助初级绕组连接在串联连接电路的连接点（C; F）和桥形电路（110310）的输出端子（B; E）之间。 谐振电容器（113a，113b，114a，114b; 313a，313b，314a，314b）分别与构成桥接电路的各主开关元件（111a，111b，112a，112b; 311a，311b，312a，312b） （310），以便与谐振线圈（108; 308）共振。 磁耦合到次级初级绕组（106）的A相和B相次级绕组（107a，107b）的两端的电压被钳位到电源电压，在子级中产生与匝数比成比例的固定电压 初级绕组（106），施加到谐振线圈（109）的电压变小，电流波动变小。 在另一个实施例中，辅助初级绕组（306）磁耦合到连接到主桥电路（310）的主初级绕组（331）H桥，其中主谐振电路（310）在共振共振期间被控制 线圈（308），并且使用在辅助初级绕组（306）中感应的电压终止谐振。