Zero crossing detection device and method and electrical appliance

A zero-crossing detection circuit and zero-crossing detection technology, applied in the electronic field, can solve the problems of harsh use conditions and large errors of zero-crossing detection technology

Active Publication Date: 2018-04-24
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a zero-crossing detection device, method and electrical appliance, w

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  • Zero crossing detection device and method and electrical appliance
  • Zero crossing detection device and method and electrical appliance
  • Zero crossing detection device and method and electrical appliance

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[0028] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0029] Such as figure 1 As shown, this embodiment discloses a zero-crossing detection device, the zero-crossing detection device includes: a zero-crossing detection circuit 1, which is used to compare the full-wave signal and the DC signal generated by rectifying and filtering the alternating current respectively to obtain Obtain the pulse of the corresponding comparison signal; and the controller 2 is used to receive the pulse of the comparison signal to trigger the controller interruption, and calculate the interruption duration between two interruptions near the zero crossing point of the full-wave signal, and When the occurrence of the next interrupt is det...

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Abstract

The invention relates to the technical field of electronics, and discloses a zero crossing detection device and method and an electrical appliance. The zero crossing detection device includes a zero crossing detection circuit which is used for comparing a full wave signal and a direct current signal generated by rectifying an alternating current and rectifying and filtering the alternating currentrespectively to obtain the pulse of a corresponding comparison signal, and a controller which is used for receiving the pulse of the comparison signal to be triggered to interrupt, calculating the interruption duration between two interruptions near the zero crossing point of the full wave signal, and delaying the interruption duration by half to get a zero crossing point when detecting that nextinterruption happens. The zero crossing point is judged accurately according to the comparison signal. The method and device are applicable to multiple application scenarios with different voltages and frequencies.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to a zero-crossing detection device, method and electrical appliance. Background technique [0002] At present, household electrical appliances generally need to use switching devices such as thyristors and relays. During the working process of household appliances, the load current controlled by such switching devices is relatively large, which causes the contacts to ignite and burn during the switching process. Arcing, causing voltage oscillations. In this way, it will not only affect the life of the device, but also affect the power grid, causing fluctuations in the power grid. [0003] It has been found through research that if the switching device is controlled to switch at the zero-crossing point of the mains, since the voltage at the zero-crossing point is zero, the above-mentioned problems will not occur. Therefore, the zero-crossing detection technology emerge...

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Application Information

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IPC IPC(8): G01R19/175
CPCG01R19/175
Inventor 王彪汪钊肖小龙陈伟李睿宣龙健
Owner FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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