Alternating voltage zero-crossing detection method based on alternating voltage detection circuit

Abstract

The application discloses an alternating voltage zero-crossing detection method based on an alternating voltage detection circuit, wherein the alternating voltage detection circuit is used for rectifying, dividing and filtering an alternating voltage signal and acquiring a voltage acquisition signal with a half-wave waveform. The method comprises the following steps: detecting specific sub-waveforms in a single half-wave in a half-wave waveform by periodically collecting voltage acquisition signals; obtaining the compensation delay of a specific sub-waveforms; and judging the zero-crossing point of the alternating voltage signal according to the specific sub-waveforms and the compensation delay. According to the invention, the zero-crossing detection circuit is not specially designed, thealternating voltage detection circuit is directly utilized, and the alternating voltage zero-crossing detection is carried out by combining a software algorithm, so that the cost can be reduced, and the zero-crossing point can be accurately judged, for example, the alternating voltage zero-crossing detection method can be applied to a cooking appliance. According to the zero-crossing detection result, the heating power of the cooking appliance can be further controlled to improve the cooking efficiency and reliability of the cooking appliance.

Description

technical field [0001] The present application relates to the technical field of AC electric control, in particular to an AC voltage zero-crossing detection method based on an AC voltage detection circuit, as well as a corresponding cooking appliance and a computer-readable storage medium. Background technique [0002] In the field of home appliances, relays and thyristors are mostly used to control electric heating and electric high-power loads. The life of relays and thyristors greatly affects the life of the whole machine. Taking an AC relay as an example, when the relay contacts are closed or disconnected at the peak of the AC current, arc sparks are prone to occur, resulting in a greatly reduced contact life. If the relay operates near the zero-crossing point of the AC voltage, the life of the relay can be effectively extended. [0003] In the prior art, a zero-crossing detection circuit needs to be specially designed to detect the zero-crossing point of the AC voltage....

AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, the zero-crossing detection circuit needs to be specially designed, so the cost is relatively high, especially the hardware cost will be increased

Images