Alternating current load detection circuit, detection method thereof and household appliance

Abstract

The invention relates to an alternating current load detection circuit, a detection method thereof and a household appliance. When an alternating current load does not have a fault and the alternating current load detection circuit operates normally, in a positive half cycle of an external alternating current power supply, the alternating current power supply flows into the alternating current load through a live wire and then flows into a first end of a switching device through the alternating current load; and the current flows back to the zero line through the second end of the switching device, so that the switching device outputs a first level signal to the controller. When the external alternating current power supply works in a negative half cycle, the alternating current power supply flows into the fly-wheel diode through the zero line, then flows into the alternating current load through the fly-wheel diode and flows back to the live wire, and at the moment, the switching device has no power supply input and outputs another level signal to the controller. Finally, the controller judges according to the level signal received in real time, so that information about whether the alternating-current load has a fault or not can be directly obtained, and fault detection of the alternating-current load is realized.

Description

technical field [0001] The present application relates to the technical field of fault diagnosis, in particular to an AC load detection circuit, a detection method thereof, and household appliances. Background technique [0002] An AC load is a device that converts AC power into other forms of energy in an AC circuit. With the rapid development of science and technology, AC loads are more and more widely used in people's daily life, such as the heat pipes in electric water heaters commonly used in daily life, and the shaded pole motors commonly used in some household appliances, etc. Great convenience came. [0003] However, during the use of these AC loads, short circuit or open circuit faults often occur due to improper use or device aging, so that the home appliances cannot operate normally. During use, the user cannot know the working status of the AC load, and it is difficult to realize the fault judgment of the AC load. Contents of the invention [0004] Based on ...

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Problems solved by technology

[0004] Based on this, it is necessary to provide an AC load detection circuit, a detection method thereof, and a home appliance for the problem that it is difficult to judge the fault of the AC load during use.

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