CN107248478B - Method and circuit for protecting relay - Google Patents

Method and circuit for protecting relay Download PDF

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Publication number
CN107248478B
CN107248478B CN201710544388.5A CN201710544388A CN107248478B CN 107248478 B CN107248478 B CN 107248478B CN 201710544388 A CN201710544388 A CN 201710544388A CN 107248478 B CN107248478 B CN 107248478B
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CN
China
Prior art keywords
relay
time
protection
resistor
circuit
Prior art date
Application number
CN201710544388.5A
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Chinese (zh)
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CN107248478A (en
Inventor
蔡艳清
曾祥春
王文
周小捷
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惠州市元盛科技有限公司
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Priority to CN201710544388.5A priority Critical patent/CN107248478B/en
Publication of CN107248478A publication Critical patent/CN107248478A/en
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Publication of CN107248478B publication Critical patent/CN107248478B/en

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/223Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil adapted to be supplied by AC
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/02Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
    • H01H47/04Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current

Abstract

The invention relates to a method and a circuit for protecting a relay, which detect the pull-in time T1 and the practical voltage period T0 when the relay is opened for the first time, then calculate the advance or push-back time T3= T1- (n + 1) T0 when the relay is pulled in the next time, wherein n is a positive integer or n = 0; the method for protecting the relay also sets a mechanism for re-detecting the closing time of the relay, because the suction time deviation can also be caused due to mechanical fatigue after the relay works for a period of time, and the method for protecting the relay sets a mechanism for re-detecting the closing time of the relay, so that the condition can be avoided.

Description

Method and circuit for protecting relay

Technical Field

The invention relates to the field of relay protection, in particular to a method and a circuit for protecting a relay.

Background

When the relay controls the on-off action of an electric appliance product, a load generally generates a large impact current, so that the relay is greatly influenced, and the service life of the relay is directly shortened. At present, the method generally adopted in the market is the zero-crossing suction and the zero-crossing suction principle: because the commercial power is the alternating current, will have crest and trough, if control relay closes the contact when the peak value is minimum, and like this impulse current is minimum, can effectively prolong the life of relay. However, since the relay needs a certain time for actuation, and the relays are produced in batches, there is inconsistency, even if the calculated time is 0V actuation, the offset is large in practice, the current is also large, and the significance of zero-crossing actuation is lost.

Disclosure of Invention

In order to solve the above problems, the present invention provides a method and a circuit for protecting a relay, which can ensure that the peak value of the voltage is the lowest when the relay is pulled in, so that the service life of the relay is longer.

The technical scheme of the invention is as follows:

a method of protecting a relay comprising the steps of:

s1: closing the circuit, and acquiring standard phase information of the use voltage and cycle time T0 for the first time by the controller;

s2: in 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 the completion, the controller controls the relay to open;

s3: the controller calculates the required advance or retard time T3 when the relay is closed just at the lowest peak value, T3= T1- (n + 1) T0, n is a positive integer or n =0, according to the standard phase information and the cycle time T0 acquired in the step S1;

s4: when the relay is closed again, the controller directly makes the relay advance or retard the opening of the T3 according to the T3 calculated in step S3, acquires the standard phase information with respect to step S1 if the T3 is a positive number, the relay is closed just at the lowest peak value, the advance opening time with respect to the lowest peak value is required to be T3, and acquires the standard phase information with respect to step S1 if the T3 is a negative number, the relay is closed just at the lowest peak value, and the retard opening time with respect to the lowest peak value is required to be | T3 |.

Preferably, the controller newly obtains the closing time T1 of the relay every 1000 times when the relay is closed. Of course, the newly acquired relay closing time T1 can be set according to actual requirements, and the relay is only commonly used every 1000 times.

The invention also comprises another technical scheme as follows:

a circuit for protecting a relay comprises a load circuit module, a voltage acquisition module, a relay protection module and a control module, wherein the control module comprises a micro central processing unit, the voltage acquisition module comprises a voltage reduction resistor R1, one end of the voltage reduction resistor R1 is connected with a live wire L1, and the other end of the voltage reduction resistor R1 is connected with the micro central processing unit; the relay protection module includes relay, triode, protection resistance R2 and protection resistance R3, protection resistance R3 one end with little central processing unit connects, the protection resistance R3 other end with the triode is connected, protection resistance R2's one end and live wire L2 are connected, protection resistance R2's the other end is connected little central processing unit.

Preferably, the micro cpu has A, B, C three ports, the voltage dropping resistor R1 is connected to the a port of the micro cpu, the protection resistor R2 is connected to the B port of the micro cpu, and the protection resistor R3 is connected to the C port of the micro cpu.

Preferably, the resistances of the voltage-reducing resistor R1, the protection resistor R2 and the protection resistor R3 are all adjustable. The resistance values of the voltage reduction resistor and the protection resistor are adjusted according to actual requirements, so that the application range of the voltage reduction resistor and the protection resistor is wider.

The beneficial effects of adopting the above technical scheme are as follows:

1. the method for protecting the relay can ensure that the peak value just at the voltage is the lowest when the relay is attracted, so that the service life of the relay is longer.

2. The method for protecting the relay is simple, only needs to test twice, is very simple, and is very easy to realize.

3. The method for protecting the relay is provided with a mechanism for re-detecting the closing time of the relay, and the situation can be avoided because the suction time deviation can also be caused due to mechanical fatigue after the relay works for a period of time.

4. The method for protecting the relay firstly tests the actuation time of the relay when the relay is started every time, and then sends an instruction in advance according to the actuation time, thereby effectively avoiding the circuit failure caused by the inconsistency of the relay and greatly prolonging the service life of the relay.

5. The design of this protective relay's circuit is very simple, only needs a little central processing unit can accomplish, moreover, can also adjust the resistance of step-down resistance and protective resistance according to the demand of reality, makes its application scope wider.

Drawings

Fig. 1 is a circuit diagram of a method and circuit for protecting a relay according to the present invention.

Names of the corresponding components or flow names represented by numerals or letters in the drawings: 1. the device comprises a load circuit module, 2, a voltage acquisition module, 3, a relay protection module, 4, a control module, 41, a micro central processing unit, 5, a relay and 6, a triode.

Detailed Description

In order to facilitate understanding for those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and examples.

Example one

A method of protecting a relay comprising the steps of:

s1: closing the circuit, and acquiring standard phase information of the use voltage and cycle time T0 for the first time by the controller; the obtained using voltage of the embodiment is 220V, and the cycle time T0=20 ms;

s2: in 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 the completion, the controller controls the relay to open; the relay closing time T1=35ms in the present embodiment;

s3: the controller calculates the required advance or retard time T3 when the relay is closed just at the lowest peak value, T3= T1- (n + 1) T0, n is a positive integer or n =0, according to the standard phase information and the cycle time T0 acquired in the step S1;

s4: when the relay is closed again, the controller directly makes the relay advance or retard the opening of the T3 according to the T3 calculated in step S3, acquires the standard phase information with respect to step S1 if the T3 is a positive number, the relay is closed just at the lowest peak value, the advance opening time with respect to the lowest peak value is required to be T3, and acquires the standard phase information with respect to step S1 if the T3 is a negative number, the relay is closed just at the lowest peak value, and the retard opening time with respect to the lowest peak value is required to be | T3 |. In this embodiment, if n =0 is calculated, T3=15ms, then the standard phase information is acquired in step S1, the relay is closed just at the lowest peak, and the opening time needs to be advanced by 15ms from the lowest peak time, of course, n may also be other positive integers, for example, n =1, T3= -5ms, then the standard phase information is acquired in step S1, the relay is closed just at the lowest peak, and the opening time needs to be delayed by 5ms from the lowest peak time;

specifically, the controller newly obtains the relay closing time T1 every 1000 times the relay is closed.

Example two

In the method for protecting the relay in the second embodiment, every time the relay is closed 500 times, the controller newly obtains the relay closing time T1, and other components and connection modes are the same as those in the first embodiment.

EXAMPLE III

A circuit for protecting a relay comprises a load circuit module 1, a voltage acquisition module 2, a relay protection module 3 and a control module 4, wherein the control module comprises a micro central processing unit 41, the voltage acquisition module comprises a voltage reduction resistor R1, one end of the voltage reduction resistor R1 is connected with a live wire L1, and the other end of the voltage reduction resistor R1 is connected with the micro central processing unit; the relay protection module comprises a relay 5, a triode 6, a protection resistor R2 and a protection resistor R3, one end of the protection resistor R3 is connected with the micro central processing unit, the other end of the protection resistor R3 is connected with the triode, one end of the protection resistor R2 is connected with a live wire L2, and the other end of the protection resistor R2 is connected with the micro central processing unit. The micro central processing unit adopted in the embodiment is.

Specifically, the micro central processing unit has A, B, C three ports, the voltage reduction resistor R1 is connected with the A port of the micro central processing unit, the protection resistor R2 is connected with the B port of the micro central processing unit, and the protection resistor R3 is connected with the C port of the micro central processing unit. The micro central processing unit adopted in the embodiment is an SPM8 series.

Specifically, the resistances of the voltage dropping resistor R1, the protection resistor R2 and the protection resistor R3 are all adjustable.

The working flow of the circuit of the protective relay is as follows: the circuit is powered on, a live wire L1 enters an A port of the miniature central processing unit through voltage reduction of R1, the miniature central processing unit obtains standard phase information and a period T0, after the relay is attracted, the phase information of the live wire enters a B port of the miniature central processing unit through R2 again, meanwhile, the attraction time T1 of the relay is obtained, the inside of the miniature central processing unit compares the time difference obtained by the B port and the A port, and the time difference T3 that the relay is advanced or delayed through a C point instruction is calculated.

Example four

The micro central processing unit of the circuit of the protection relay in the fourth embodiment is a PICF16F series, and other components and connection modes are the same as those in the third embodiment.

The technical solutions in the embodiments of the present invention are clearly and completely described above with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (4)

1. A method of protecting a relay, comprising the steps of:
s1: closing the circuit, and acquiring standard phase information of the use voltage and cycle time T0 for the first time by the controller;
s2: in 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 the completion, the controller controls the relay to open;
s3: the controller calculates the required advance or retard time T3 when the relay is closed just at the lowest peak value, T3= T1- (n + 1) T0, n is a positive integer or n =0, according to the standard phase information and the cycle time T0 acquired in the step S1;
s4: when the relay is closed again, the controller directly calculates T3 according to the step S3, the relay is enabled to advance or delay the opening of the T3, if the T3 is a positive number, standard phase information is obtained relative to the step S1, the relay is just closed at the lowest peak value, the opening time needs to be advanced relative to the lowest peak value time to be T3, if the T3 is a negative number, the standard phase information is obtained relative to the step S1, the relay is just closed at the lowest peak value, and the opening time needs to be delayed relative to the lowest peak value time to be | T3 |;
and when the relay closing times exceed the preset closing times, the controller reacquires the relay closing time T1.
2. A circuit for protecting a relay, characterized in that it is applied to the method for protecting a relay according to claim 1, the circuit comprising a load circuit module (1), a voltage acquisition module (2), a relay protection module (3) and a control module (4), the control module comprising a micro-cpu (41), the voltage acquisition module comprising a voltage reduction resistor R1, the voltage reduction resistor R1 being connected at one end to a live line L1, the voltage reduction resistor R1 being connected at the other end to the micro-cpu; the relay protection module includes relay (5), triode (6), protection resistance R2 and protection resistance R3, protection resistance R3 one end with little central processing unit connects, the protection resistance R3 other end with the triode is connected, protection resistance R2's one end and live wire L2 are connected, protection resistance R2's the other end is connected little central processing unit.
3. The circuit of the protection relay according to claim 2, wherein the micro cpu has A, B, C three ports, the voltage dropping resistor R1 is connected to the a port of the micro cpu, the protection resistor R2 is connected to the B port of the micro cpu, and the protection resistor R3 is connected to the C port of the micro cpu.
4. The circuit of the protection relay according to claim 3, wherein the resistances of the voltage-reducing resistor R1, the protection resistor R2 and the protection resistor R3 are all adjustable.
CN201710544388.5A 2017-07-06 2017-07-06 Method and circuit for protecting relay CN107248478B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710544388.5A CN107248478B (en) 2017-07-06 2017-07-06 Method and circuit for protecting relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710544388.5A CN107248478B (en) 2017-07-06 2017-07-06 Method and circuit for protecting relay

Publications (2)

Publication Number Publication Date
CN107248478A CN107248478A (en) 2017-10-13
CN107248478B true CN107248478B (en) 2020-09-04

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2859778Y (en) * 2005-12-23 2007-01-17 郭赐福 Zero cross-over control system
CN101577192A (en) * 2009-06-12 2009-11-11 百利通电子(上海)有限公司 Method of zero passage switch of electromagnetic relay and circuit
CN102419562A (en) * 2011-12-14 2012-04-18 海信(山东)空调有限公司 Control method of relay with inductive load, and household appliance
CN202917398U (en) * 2012-10-22 2013-05-01 厦门市芯阳科技有限公司 Self-adjusting zero-crossing control circuit for electromagnetic?relay
CN204242953U (en) * 2014-11-27 2015-04-01 广东美的厨房电器制造有限公司 Relay controller
CN104934264A (en) * 2015-07-09 2015-09-23 深圳市兰丁科技有限公司 Method of protecting relay and system thereof
CN106098473A (en) * 2016-08-05 2016-11-09 江苏特力威信息系统有限公司 Self adaptation zero passage on-off control device and method
CN106783395A (en) * 2017-01-04 2017-05-31 江苏金坛绿能新能源科技有限公司 A kind of arc extinguishing relay and its arc-suppressing method
CN206947259U (en) * 2017-07-06 2018-01-30 惠州市元盛科技有限公司 A kind of circuit of protective relay

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2859778Y (en) * 2005-12-23 2007-01-17 郭赐福 Zero cross-over control system
CN101577192A (en) * 2009-06-12 2009-11-11 百利通电子(上海)有限公司 Method of zero passage switch of electromagnetic relay and circuit
CN102419562A (en) * 2011-12-14 2012-04-18 海信(山东)空调有限公司 Control method of relay with inductive load, and household appliance
CN202917398U (en) * 2012-10-22 2013-05-01 厦门市芯阳科技有限公司 Self-adjusting zero-crossing control circuit for electromagnetic?relay
CN204242953U (en) * 2014-11-27 2015-04-01 广东美的厨房电器制造有限公司 Relay controller
CN104934264A (en) * 2015-07-09 2015-09-23 深圳市兰丁科技有限公司 Method of protecting relay and system thereof
CN106098473A (en) * 2016-08-05 2016-11-09 江苏特力威信息系统有限公司 Self adaptation zero passage on-off control device and method
CN106783395A (en) * 2017-01-04 2017-05-31 江苏金坛绿能新能源科技有限公司 A kind of arc extinguishing relay and its arc-suppressing method
CN206947259U (en) * 2017-07-06 2018-01-30 惠州市元盛科技有限公司 A kind of circuit of protective relay

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