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Method of zero passage switch of electromagnetic relay and circuit

A technology of electromagnetic relays and switching circuits, applied in relays, circuits, electrical components, etc., can solve the problems of reducing the life of relays, EMI interference, etc., and achieve the effect of improving service life and reducing manufacturing costs

Active Publication Date: 2009-11-11
PERICOM TECH (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the control circuits of electric irons, electric water heaters, electric ovens, air conditioners, refrigerators, etc. Sparking is the fatal killer of relay contacts, which greatly reduces the life of the relay and brings EMI interference problems at the same time

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  • Method of zero passage switch of electromagnetic relay and circuit
  • Method of zero passage switch of electromagnetic relay and circuit
  • Method of zero passage switch of electromagnetic relay and circuit

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Embodiment Construction

[0037] The specific embodiments of the present invention will be further described with reference to the accompanying drawings.

[0038] Such as figure 1 As shown, the zero-crossing pull-in method of an electromagnetic relay includes the following steps:

[0039] S101, setting the initial value of the electromagnetic relay closing advance;

[0040] S102, detecting load input AC voltage;

[0041] S103: According to the pull-in control signal and the predicted load input AC zero point, the electromagnetic relay is pulled in ahead of the load input AC zero point by the initial value of the electromagnetic relay pull-in advance;

[0042] S104, detecting the actual pull-in time point of the electromagnetic relay and the load input AC zero point;

[0043] S105: If the actual pull-in time of the electromagnetic relay coincides with the AC zero point of the load input, the end is ended; otherwise, step S106 is executed;

[0044] S106: Correct the pull-in advance of the electromagnetic re...

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Abstract

The invention discloses a method of a zero passage switch of an electromagnetic relay and a circuit, wherein an electromagnetic relay zero passage pull-in method comprises the following steps of: setting an initial value of the pull-in initial lead of the electromagnetic relay; detecting the input alternating voltage; pulling in the electromagnetic relay in advance before the input alternating zero point by the initial value of the pull-in initial lead of the electromagnetic relay according to pull-in control signals and the predicted input alternating zero point; detecting the actual pull-in time point of the electromagnetic relay and the input alternating zero point; if the actual pull-in time point of the electromagnetic relay and the input alternating zero point are identical, ending the detection; if not, modifying the pull-in initial lead of the electromagnetic according to the error between the actual pull-in time point of the electromagnetic relay and the input alternating zero point; and then repeatedly executing the steps. The invention solves the problems of striking fire of the electromagnetic relay and EMI by a circuit self-learning way, improves the service life of the relay, and reduces the manufacture cost of circuit design.

Description

Technical field [0001] The invention belongs to the technical field of electronic circuits, and particularly relates to a zero-crossing switching method and circuit of an electromagnetic relay. Background technique [0002] Electromagnetic relays are mostly used in the control circuits of high-power home appliances such as electric irons, electric water heaters, electric ovens, air conditioners, refrigerators, etc., and the ignition during the switching of the relay contacts is the deadly killer of the relay contacts, which greatly reduces the number of relays. Longevity, and at the same time brought EMI interference problems. [0003] The applicant has already submitted a patent application for a zero-crossing trigger circuit to solve the problem of relay ignition. For details, please refer to patent ZL 2006 2 0039011.1. This application is an improvement on the basis of the previous patent. Thyristor reduces the cost, not only can achieve the same purpose, but also can adapt to...

Claims

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Application Information

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IPC IPC(8): H01H47/02
Inventor 姚利黄德松卫勇
Owner PERICOM TECH (SHANGHAI) CO LTD
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