Wireless remote control circuit and key power supply circuit thereof

The utility model discloses a wireless remote control circuit and a key power supply circuit thereof. The key power supply circuit comprises a first input terminal, a second input terminal, a first output terminal and a second output terminal, the second input terminal is used for externally connecting the negative electrode of the battery; the first output terminal is used for being externally connected with a power supply access terminal of a main control chip; the second output terminal is used for being externally connected with a grounding terminal of the main control chip; a first switching device; a second switching device; a third switching device; a reset switch; the signal output terminal is used for being externally connected with the first interface of the main control chip; and the signal input terminal is used for being externally connected with the second interface of the main control chip. The key power supply circuit is energy-saving, and the service life of the battery can be prolonged. 本实用新