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Method of zero passage switch of electromagnetic relay and circuit

An electromagnetic relay, zero-crossing technology, applied in relays, circuits, electrical components, etc., to reduce manufacturing costs and improve service life

Active Publication Date: 2011-05-04
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

Method used

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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

Examples

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Embodiment Construction

[0039] The specific embodiments of the present invention will be further described with reference to the accompanying drawings.

[0040] like figure 1 As shown, the electromagnetic relay zero-crossing pull-in method includes the following steps:

[0041] S101, set the initial value of the pull-in advance amount of the electromagnetic relay;

[0042] S102, detect the load input AC voltage;

[0043] S103, according to the pull-in control signal and the predicted load input AC zero point, pull in the electromagnetic relay in advance with the initial value of the pull-in advance amount of the electromagnetic relay before the load input AC zero point;

[0044] S104, detecting the actual pull-in time point of the electromagnetic relay and the load input AC zero point;

[0045] S105, if the actual pull-in time point of the electromagnetic relay matches the load input AC zero point, the process ends, otherwise, step S106 is performed;

[0046] S106 , correct the pull-in advance o...

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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-intime 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 zeropoint; 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 in particular relates to a zero-crossing switch method and circuit of an electromagnetic relay. Background technique [0002] Electromagnetic relays are mostly used in the control circuits of electric irons, electric water heaters, electric ovens, air conditioners, refrigerators and other high-power household appliances, and the ignition during the relay contact switching process is the fatal killer of the relay contacts, which greatly reduces the relay contact. Life, and at the same time brought the problem of EMI interference. [0003] However, the applicant has already submitted a patent application for a zero-crossing trigger circuit to solve the problem of the ignition of the relay. For details, please refer to the patent ZL 2006 2 0039011.1. This application is improved on the basis of the previous patent, and the possible The silicon controlled circuit reduces the cost, n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H47/02
Inventor 姚利黄德松卫勇
Owner PERICOM TECH (SHANGHAI) CO LTD
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