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A method and circuit for protecting a relay

A technology for protecting relays and relays, applied in relays, circuits, electrical components, etc., can solve problems such as loss of zero-crossing pull-in, inconsistency, large current, etc., and achieve the effects of easy implementation, simple design, and long service life

Active Publication Date: 2020-09-04
HUIZHOU CITY YUAN SHENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it takes a certain amount of time for the relay to pick up and the relay is produced in batches, there will be inconsistencies. Even if the calculated time is to pick up at 0V, it will actually deviate a lot, and the current will also be very large, and the zero crossing will be lost. The meaning of suction

Method used

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  • A method and circuit for protecting a relay

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for protecting a relay, comprising the steps of:

[0026] S1: closed circuit, the controller obtains the standard phase information and cycle time T0 of the used voltage for the first time; in this embodiment, the used voltage is 220V, and the cycle time T0=20ms;

[0027] S2: At the same time as step S1, the controller also controls the relay to close, and the controller also obtains the relay closing time T1 for the first time, and after completion, the controller controls the relay to open; in this embodiment, the relay closing time T1=35ms;

[0028] S3: According to the standard phase information and cycle time T0 obtained in step S1, the controller calculates the time T3 needed to be advanced or delayed when the relay is just closed at the lowest peak value, T3 = T1-(n+1)T0, n is a positive integer or n=0;

[0029] S4: When the relay closes again, the controller directly calculates T3 according to step S3, and makes the relay open earlier or later than T3....

Embodiment 2

[0032] In the method for protecting the relay in the second embodiment, every time the relay is closed 500 times, the controller reacquires the closing time T1 of the relay, and other components and connection methods are the same as those in the first embodiment.

Embodiment 3

[0034] A circuit for protecting a relay, including a load circuit module 1, a voltage acquisition module 2, a relay protection module 3 and a control module 4, the control module includes a micro central processing unit 41, the voltage acquisition module includes a drop resistor R1, and one end of the drop resistor R1 Connect the fire wire L1, the other end of the drop-down resistor R1 is connected to the micro central processing unit; the relay protection module includes a relay 5, a triode 6, a protection resistance R2 and a protection resistance R3, one end of the protection resistance R3 is connected to the micro central processing unit, and the other end of the protection resistance R3 It is connected with the triode, one end of the protection resistor R2 is connected with the live line L2, and the other end of the protection resistor R2 is connected with the micro central processing unit. The micro central processing unit that present embodiment adopts is.

[0035] Speci...

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PUM

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Abstract

The invention discloses a method and a circuit for protecting a relay. The method for protecting the relay comprises the steps of detecting actuation time T1 and a practical voltage cycle T0 when the relay is turned on first time, and then calculating the advance or delay time T3=T1-(n+1)T0 when the relay is actuated next time, wherein n is a positive integer or n is equal to 0. A mechanism of re-detecting the closing time of the relay is further set in the method for protecting the relay, for the actuation time deviates due to mechanical fatigue after the relay works a period of time, and the method for protecting the relay can avoid this situation by setting the mechanism of re-detecting the closing time of the relay.

Description

technical field [0001] The invention relates to the field of relay protection, in particular to a method and circuit for protecting a relay. Background technique [0002] When the relay controls the switching action of electrical products, the load generally generates a large inrush current, which has a great impact on the relay and directly reduces the service life of the relay. At present, the method commonly used in the market is zero-crossing pull-in, zero-crossing pull-in principle: because the mains is alternating current, there will be peaks and valleys, if the control relay closes the contact when the peak value is the lowest, then the impact current is the smallest , can effectively prolong the service life of the relay. However, because it takes a certain amount of time for the relay to pick up, and the mass production of the relay, there will be inconsistencies. Even if the calculated time is to pick up at 0V, it will actually shift a lot, and the current will al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H47/04H01H47/22
CPCH01H47/04H01H47/223
Inventor 蔡艳清曾祥春王文周小捷
Owner HUIZHOU CITY YUAN SHENG TECH CO LTD