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1. 发明授权

US06473284B1 Low-power dc-to-dc converter having high overvoltage protection 失效
标题翻译：具有高过压保护功能的低功率DC-DC转换器
公开(公告)号：US06473284B1
公开(公告)日：2002-10-29
申请号：US09657633
申请日：2000-09-06
申请人： Milan Zarko Ilic , Warren Ralph Germer , Richard Alan Balch
发明人： Milan Zarko Ilic , Warren Ralph Germer , Richard Alan Balch
IPC分类号： H02H320
CPC分类号： H02M1/32 , H02H7/1213 , H02M3/155
摘要： A dc-to-dc converter is provided with overvoltage protection circuitry while still providing normal output voltage. Such overvoltage protection circuitry does not require resetting. The overvoltage protection circuitry includes a first switching device connected between the input bridge and a dc output voltage bus and further includes an overvoltage current path. The overvoltage current path includes a complementary switching device in series with Zener diode circuitry having a predetermined breakdown voltage, and further has a transition current path. The first switching device is closed for nominal input voltage and is open for overvoltages. When the input voltage exceeds the Zener diode breakdown voltage, the transition current path conducts current. When the threshold voltage of the complementary switching device is exceeded, the complementary switching device turns on and conducts current through the overvoltage current path. After the overvoltage transient condition subsides and the input voltage decreases back to the nominal range, the complementary switching device turns off, and normal converter operation resumes.
摘要翻译： DC-DC转换器提供过压保护电路，同时仍然提供正常的输出电压。这种过电压保护电路不需要复位。过电压保护电路包括连接在输入桥和直流输出电压母线之间的第一开关装置，并且还包括过压电流路径。过电压电流路径包括与具有预定击穿电压的齐纳二极管电路串联的互补开关器件，并且还具有转换电流通路。第一个开关器件为标称输入电压闭合，并且过电压开路。当输入电压超过齐纳二极管击穿电压时，转换电流路径导通电流。当超过互补开关器件的阈值电压时，互补开关器件导通，并通过过压电流通路导通电流。过电压瞬变状态消失，输入电压降低到标称范围后，互补开关器件关闭，恢复正常的转换器工作。

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