摘要：【中文】本发明公开了一种应用于多电源供电的电源切换电路，包括第一过压保护电路、第一开关电路、第一稳压器、第二过压保护电路、第二开关电路、第二稳压器、电压监测电路、非门、逻辑电路和延迟电路；其特征在于：第一过压保护电路用于对主电源进行过压保护；第二过压保护电路用于对副电源进行过压保护；电压监测电路将第一过压保护电路的输出电压进行电压监测，输出使能信号到第一开关电路、非门、逻辑电路和延迟电路；当电压监测电路监测到第一过压保护电路输出的电压在设定的监测电压值范围内时,电压监测电路输出使能信号使第一开关电路开启，并且所述电压监测电路输出使能信号通过非门进行处理后，使第二开关电路断开；可广泛用于电源管理等领域。 【EN】The invention discloses a power supply switching circuit applied to multi-power supply, which comprises a first overvoltage protection circuit, a first switch circuit, a first voltage stabilizer, a second overvoltage protection circuit, a second switch circuit, a second voltage stabilizer, a voltage monitoring circuit, a NOT gate, a logic circuit and a delay circuit, wherein the first overvoltage protection circuit is connected with the first switch circuit; the method is characterized in that: the first overvoltage protection circuit is used for performing overvoltage protection on a main power supply; the second overvoltage protection circuit is used for performing overvoltage protection on the auxiliary power supply; the voltage monitoring circuit carries out voltage monitoring on the output voltage of the first overvoltage protection circuit and outputs an enabling signal to the first switch circuit, the NOT gate, the logic circuit and the delay circuit; when the voltage monitoring circuit monitors that the voltage output by the first overvoltage protection circuit is within a set monitoring voltage value range, the voltage monitoring circuit outputs an enabling signal to enable the first switch circuit to be started, and the voltage monitoring circuit outputs the enabling signal to enable the second switch circuit to be disconnected after the enabling signal is processed through a NOT gate; the method can be widely applied to the fields of power management and the like.