Charging circuit, control method, system and device, and air conditioner

Abstract

The present invention provides a charging circuit, a control method, a system and a device, and an air conditioner. The charging circuit includes a normally open relay and a normally closed relay connected in series; and also includes: a comparator; a voltage divider circuit connected to one of the positive input terminal or the negative input terminal of the comparator; and a protection circuit connected between the normally closed relay and the comparator and connected to the output terminal of the comparator; wherein the other of the positive input terminal or the negative input terminal of the comparator is connected to a reference voltage. By setting a comparator, the voltage divider circuit input voltage is compared with the reference voltage. When the wrong wiring causes overvoltage, the voltage comparison result is transmitted to the protection circuit through the comparator, and the protection circuit is controlled to start circuit protection to prevent the air conditioner circuit system from malfunctioning under overvoltage conditions.

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