Household appliance and surge protection circuit and method for household appliance

A technology for surge protection and home appliance equipment, which is applied to emergency protection circuit devices, emergency protection circuit devices, circuit devices and other directions for limiting overcurrent/overvoltage to achieve bidirectional protection, avoid false surge protection, and improve protection. The effect of sensitivity

Active Publication Date: 2018-10-16
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some defects in the current surge protectio

Method used

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  • Household appliance and surge protection circuit and method for household appliance
  • Household appliance and surge protection circuit and method for household appliance
  • Household appliance and surge protection circuit and method for household appliance

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[0031] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0032] The following describes the surge protection circuit for household electrical appliances, household electrical appliances, and surge protection methods for household electrical appliances according to embodiments of the present invention with reference to the accompanying drawings.

[0033] figure 1 It is a schematic block diagram of a surge protection circuit for household appliances according to an embodiment of the present invention. Such as figure 1 As shown, the power supply circuit of the h...

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Abstract

The present invention discloses a household appliance and a surge protection circuit and method for the household appliance. The surge protection circuit includes: a zero-crossing detection unit for obtaining a zero-crossing interval of AC mains by performing a zero-crossing detection on a pulsating direct current; a bidirectional surge detecting unit, including first to third detecting branches,for detecting a forward surge trigger voltage, a current surge voltage, and a negative surge trigger voltage of the AC mains respectively; and a control unit for triggering a surge protection when thecurrent surge voltage is judged to be greater than a preset reference voltage by the zero-crossing interval of the AC mains, and judging whether to trigger the surge protection according to a relationship between a current surge voltage and the forward surge trigger voltage and the negative surge trigger voltage when the AC mains are not in the zero-crossing interval. According to the household appliance and the surge protection circuit and the method for the household appliance, the circuit adopts an unidirectional surge protection in the zero-crossing intervals and a bidirectional surge protection in a non-zero-crossing interval, so that a bidirectional protection can be realized, a protection sensitivity is improved, and a surge false protection during zero-crossing can be avoided.

Description

technical field [0001] The invention relates to the technical field of household electrical appliances, in particular to a surge protection circuit for household electrical appliances, a household electrical appliance and a surge protection method for household electrical appliances. Background technique [0002] With the improvement of people's living standards, there are more and more electronic products, and the probability of surges in the entire mains network is also increasing. In addition, lightning strikes are also very likely to cause surge signals in the entire mains network, thereby affecting power consumption. product interference or even damage. [0003] In order to effectively suppress the interference of surge signals, surge protection circuits are generally installed in power-consuming products. However, the current surge protection circuit still has certain defects, so it is necessary to improve the surge protection circuit. Contents of the invention [...

Claims

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Application Information

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IPC IPC(8): H02H9/00
CPCH02H9/005
Inventor 王彪汪钊李睿陈伟肖小龙
Owner FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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