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    • 10. 发明授权
    • Resonant switching power supply device which suppresses a switching frequency raised at the time of light load
    • 谐振开关电源装置,其抑制轻负载时升高的开关频率
    • US08395912B2
    • 2013-03-12
    • US12861887
    • 2010-08-24
    • Hiroshi Usui
    • Hiroshi Usui
    • H02M3/335
    • H02M3/337H02M2001/0058Y02B70/1433Y02B70/1491
    • The resonant switching power supply device is equipped with switching elements QH and QL connected in series to an input direct-current power source Vin, a transformer T1 having secondary windings S1 and S2 and a primary winding P1, a resonant circuit where the primary winding P1 and a current resonant capacitor Cri are connected in series and which is connected in parallel to any one of the switching elements, and a rectifying circuit (D1+D2+Co) connected to the secondary winding to obtain an output voltage Vo; the transformer T1 is equipped with a primary winding P2 closely coupled to the primary winding P1, one terminal of the primary winding P2 is connected to one or the other terminal of the primary winding P1. By the other terminal is an open circuit at any time, it suppresses the switching frequency raised at the time of light load.
    • 谐振开关电源装置具有串联连接到输入直流电源Vin,具有次级绕组S1和S2的变压器T1和初级绕组P1的开关元件QH和QL,其中初级绕组P1 和电流谐振电容器Cri串联连接并联连接到任何一个开关元件,以及整流电路(D1 + D2 + Co),连接到次级绕组以获得输出电压Vo; 变压器T1配备有紧密耦合到初级绕组P1的初级绕组P2,初级绕组P2的一个端子连接到初级绕组P1的一个或另一个端子。 另一端在任何时候都是开路,抑制了轻负载时提高的开关频率。