Circuit for indicating state of alternating current or direct current (AC/ DC) charging guns

The invention relates to a circuit for indicating the state of AC/ DC charging guns. The circuit comprises a 12 V DC switching power supply for supplying power for the circuit, a first forward direction rectifying circuit, a first voltage regulator circuit for outputting +5 V voltage signals, a first comparator, a first filter circuit connected to the output end of the first comparator, a first high level conduction switch element and a first alarm device, wherein the output end of the first voltage regulator circuit is connected to the positive input end of the first comparator; CP signals of the AC charging gun or CC1 signals of the DC charging gun are connected to the negative input end of the first comparator through the first forward direction rectifying circuit; the output signals of the first comparator receive the treatment of the first filter circuit and then control the first high level conduction switch element to be on or off; the first alarm device issues alarm signals when the first high level c