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    • 2. 发明授权
    • Circuit and method for driving capacitive load
    • 用于驱动电容性负载的电路和方法
    • US06366063B1
    • 2002-04-02
    • US09814090
    • 2001-03-21
    • Yoshizumi Sekii
    • Yoshizumi Sekii
    • G05F1613
    • G09G3/2965G05F1/613G09G3/293G09G3/296G09G3/30G09G2320/0228
    • When a first switch is closed, a power-supply voltage V is applied to a serial resonance circuit that is made up of a coil and a capacitive load. When the voltage Vc of the capacitive load exceeds the power-supply voltage V, a diode conducts a current, and thereby the voltage Vc of the capacitive load is clamped at the power-supply voltage V, and resonance stops. As a result, a flywheel current flows through a closed loop that is made up of a coil, a first diode, and a first switch in a closed state, in this order. When the first switch is opened, the flywheel current has the loop shut off, and, therefore, the voltage of the serial resonance circuit falls rapidly in order to sustain or maintain the current, and falls below the earth potential so as to allow a second diode to conduct the current. Thereby, the flywheel current flows through the path that is made up of the second diode, the coil, and the first diode, and is regenerated to the power source, and the current energy saved in the coil is returned to the power source.
    • 当第一开关闭合时,将电源电压V施加到由线圈和电容负载构成的串联谐振电路。 当电容性负载的电压Vc超过电源电压V时,二极管导通电流,从而将电容性负载的电压Vc钳位在电源电压V,并且谐振停止。 结果,飞轮电流依次流过由闭合状态的线圈,第一二极管和第一开关构成的闭环。 当第一开关断开时,飞轮电流具有环路关断,因此串联谐振电路的电压迅速下降以维持或保持电流,并且降低到地电位以下,以允许第二开关 二极管导通电流。 因此,飞轮电流流过由第二二极管,线圈和第一二极管构成的路径,并再生到电源,并且保存在线圈中的电流能量返回到电源。