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    • 5. 发明授权
    • Switching power supply having low loss characteristics
    • 具有低损耗特性的开关电源
    • US06246594B1
    • 2001-06-12
    • US09618729
    • 2000-07-18
    • Yoshiaki MatsudaTaisuke Endo
    • Yoshiaki MatsudaTaisuke Endo
    • H02M3335
    • H02M3/337H02M3/33592H02M7/5236H02M2001/0048Y02B70/1475Y02B70/1491
    • A switching power supply having low loss includes two sub switching elements connected in series, which are then connected in parallel with a bridge circuit. A resonance coil and a sub primary winding are connected between a connection point of the series connection circuits and an output terminal of the bridge circuit. Resonance capacitors are respectively connected in parallel with each main switching element constituting the bridge circuit so as to resonate with the resonance coil. Voltages across the two ends of A phase and B phase sub secondary windings magnetically coupled to the sub primary winding are clamped to the supply voltage. A fixed voltage in proportion to the turns ratio is generated in the sub primary winding. A voltage applied to the resonance coil becomes small, and current fluctuation becomes small. Also, two sub switching elements connected in series are then connected in parallel with a main bridge circuit; and a resonance coil and auxiliary primary winding are connected between a connection point C of the series connection circuits and an output terminal B of the main bridge circuit. Resonance capacitors are respectively connected in parallel with each main switching element constituting the main bridge circuit. The auxiliary primary winding is magnetically coupled to a main primary winding H-bridge connected to the main bridge circuit, the main bridge circuit being controlled during resonance of the resonance coil, and the resonance being terminated using a voltage induced in the auxiliary primary winding.
    • 具有低损耗的开关电源包括串联连接的两个子开关元件,然后与桥接电路并联连接。 在串联连接电路的连接点和桥接电路的输出端子之间连接有共振线圈和次级初级绕组。 谐振电容器分别与构成桥接电路的每个主开关元件并联连接,以便与谐振线圈谐振。 磁耦合到次级初级绕组的A相和B相次级绕组两端的电压被钳位到电源电压。 在次级绕组中产生与匝数比成比例的固定电压。 施加到谐振线圈的电压变小,电流波动变小。 此外,串联连接的两个子开关元件然后与主桥电路并联连接; 并且在串联电路的连接点C和主桥电路的输出端子B之间连接有谐振线圈和辅助初级绕组。 谐振电容器分别与构成主桥电路的每个主开关元件并联连接。 辅助初级绕组磁耦合到连接到主桥电路的主初级绕组H桥,主桥电路在谐振线圈的谐振期间被控制,并且使用在辅助初级绕组中感应的电压来终止谐振。