Power device dual-function detection circuit and protection circuit

The invention discloses a power device dual-function detection circuit and protection circuit, when a power device is in an on state, a first switch circuit of a short circuit detection circuit is controlled to be locked, a second switch circuit of an overvoltage detection circuit is controlled to be unlocked, and a detection module judges whether the power device is short-circuited by detecting the voltage of the short circuit detection circuit; when the power device is in a turn-off state, the first switching circuit of the short-circuit detection circuit is controlled to be unlocked, the second switching circuit of the overvoltage detection circuit is controlled to be locked, and the detection module judges whether the power device is in an overvoltage state by detecting the voltage of the overvoltage detection circuit. According to the invention, the short circuit detection circuit and the overvoltage detection circuit are set in corresponding states in different states of the power device, so that double