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    • 85. 发明申请
    • High-Frequency Power MESFET Buck Switching Power Supply
    • 高频功率MESFET降压开关电源
    • US20070170897A1
    • 2007-07-26
    • US11307202
    • 2006-01-26
    • Richard Williams
    • Richard Williams
    • G05F1/00
    • H02M3/155H01L29/8128
    • A MESFET based buck converter includes an N-channel MESFET between a battery or other power source and a node Vx. The node Vx is connected to an output node via an inductor and to ground via a Schottky diode or a second MESFET or both. A control circuit drives the MESFET (and the second MESFET) so that the inductor is alternately connected to the battery and to ground. The maximum voltage impressed across the high side MESFET is optionally clamped by a Zener diode. In some implementations, the MESFET is connected in series with a MOSFET. The MOSFET is switched off during sleep or standby modes to minimize leakage current through the MESFET. The MOSFET is therefore switched at a low frequency compared to the MESFET and does not contribute significantly to switching losses in the converter. In other implementations, more than one MESFET is connected in series with a MOSFET the MOSFETs being switched off during periods of inactivity to suppress leakage currents.
    • 基于MESFET的降压转换器包括电池或其他电源与节点Vx之间的N沟道MESFET。 节点Vx通过电感器连接到输出节点,并通过肖特基二极管或第二MESFET或两者接地。 控制电路驱动MESFET(和第二MESFET),使得电感器交替地连接到电池和接地。 通过高边MESFET施加的最大电压可选择地由齐纳二极管钳位。 在一些实现中,MESFET与MOSFET串联连接。 在睡眠或待机模式期间,MOSFET关闭,以最大限度地减少通过MESFET的漏电流。 因此,与MESFET相比,MOSFET以低频率切换,并且对转换器中的开关损耗没有显着影响。 在其他实现中,多个MESFET与MOSFET串联连接,MOSFET在不活动期间被关断以抑制漏电流。