CN104409281A - Relay-controlled high-current load contact protection circuit - Google Patents
Relay-controlled high-current load contact protection circuit Download PDFInfo
- Publication number
- CN104409281A CN104409281A CN201410760984.3A CN201410760984A CN104409281A CN 104409281 A CN104409281 A CN 104409281A CN 201410760984 A CN201410760984 A CN 201410760984A CN 104409281 A CN104409281 A CN 104409281A
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- CN
- China
- Prior art keywords
- relay
- contact jaw
- contact
- protection circuit
- triode thyristor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit 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
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- Electronic Switches (AREA)
Abstract
The invention discloses a relay-controlled high-current load contact protection circuit which comprises a resistive or inductive load RL and a relay RL1, wherein one end of the resistive or inductive load RL is connected with a first contact end J1 of the relay RL1, and the other end of the resistive or inductive load RL and a second contact end J2 of the relay RL1 are connected with a power supply respectively, so that a loop is formed; bidirectional controllable silicon TR1 is connected between the first contact end J1 and the second contact end J2 of the relay RL1 in parallel. The protection circuit is reasonable and skillful in design, simple in structure and relatively small in volume; by arrangement of the bidirectional controllable silicon connected with the contact ends of the relay in parallel, the bidirectional controllable silicon can be switched on at first before the circuit needs to be switched on or off by the relay, then the relay is switched on or off, and at last the bidirectional controllable silicon is switched off; as the bidirectional controllable silicon is a contact-free switch, the spark phenomenon caused by switch-on or switch-off of the contact ends of the relay can be avoided.
Description
Technical field
The present invention relates to relay protection circuit, particularly a kind of Control large current load contact protection circuit.
Background technology
In electronic technology, we are through the break-make of conventional Control load.By the mechanical contact with relay, namely carry out break-make load by the contact jaw of relay, but connect or disconnect in the process of circuit at this, usually along with the appearance of spark phenomenon, time one is long or load capacity is overweight, is easy to the contact jaw that can burn out relay.
Summary of the invention
The object of the invention is to, for the problems referred to above, provide a kind of Control large current load contact protection circuit.
The technical scheme that the present invention is adopted for achieving the above object is:
A kind of Control large current load contact protection circuit; it comprises resistive or inductive load RL, a relay R L1; this resistive or one end of inductive load RL is connected with the first contact jaw J1 of relay R L1; this resistive or other end of inductive load RL, the second contact jaw J2 of this relay R L1 are connected with power supply respectively; thus formation loop, this relay R L1 is parallel with a bidirectional triode thyristor TR1 between the first contact jaw J1, the second contact jaw J2.
The first contact jaw J3 of this bidirectional triode thyristor TR1 is connected with the first contact jaw J1 of relay R L1, and the second contact jaw J4 of this bidirectional triode thyristor TR1 is connected with the second contact jaw J2 of relay R L1.
The 3rd contact jaw J5 of this bidirectional triode thyristor TR1 is connected successively with the link CTL1 of a current-limiting resistance R2, a MCU.
The 3rd contact jaw J5 of this bidirectional triode thyristor TR1 is also connected with a current-limiting resistance R3, this current-limiting resistance R3 ground connection.
The output of this relay R L1 is connected with the first contact jaw J6 of a triode Q1, the second contact jaw J7 ground connection of this triode Q1.
A sustained diode 1 is parallel with between the input of this relay R L1 and output.
The 3rd contact jaw J8 of this triode Q1 is connected successively with the link CTL2 of a current-limiting resistance R4, described MCU.
The 3rd contact jaw J8 of this triode Q1 is also connected with a pull down resistor R5, this pull down resistor R5 ground connection.
It also comprises an an electric capacity C1 and resistance R1, one end of this electric capacity C1 is connected with the first contact jaw J3 of bidirectional triode thyristor TR1, the other end of this electric capacity C1 is connected with resistance R1, and the other end of this resistance R1 is connected with the second contact jaw J4 of this bidirectional triode thyristor TR1.
Beneficial effect of the present invention is: the present invention is reasonable in design ingenious, structure is simple, small volume, by arranging a bidirectional triode thyristor in parallel with relay contacts end, thus can before needs relay connects or disconnects circuit, first allow bidirectional triode thyristor conducting, and then be switched on or switched off relay, finally just disconnect bidirectional triode thyristor, because bidirectional triode thyristor is noncontacting switch, thus the phenomenon of sparking can be produced when the contact jaw that can be avoided relay is turned on or off.
Below in conjunction with accompanying drawing and embodiment, the present invention is further described.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Embodiment: see Fig. 1; a kind of Control large current load of the present invention contact protection circuit; it comprises resistive or inductive load RL, a relay R L1; this resistive or one end of inductive load RL is connected with the first contact jaw J1 of relay R L1; this resistive or other end of inductive load RL, the second contact jaw J2 of this relay R L1 are connected with power supply respectively; thus formation loop, this relay R L1 is parallel with a bidirectional triode thyristor TR1 between the first contact jaw J1, the second contact jaw J2.
The first contact jaw J3 of this bidirectional triode thyristor TR1 is connected with the first contact jaw J1 of relay R L1, and the second contact jaw J4 of this bidirectional triode thyristor TR1 is connected with the second contact jaw J2 of relay R L1.
The 3rd contact jaw J5 of this bidirectional triode thyristor TR1 is connected successively with the link CTL1 of a current-limiting resistance R2, a MCU.
The 3rd contact jaw J5 of this bidirectional triode thyristor TR1 is also connected with a current-limiting resistance R3, this current-limiting resistance R3 ground connection.
The output of this relay R L1 is connected with the first contact jaw J6 of a triode Q1, the second contact jaw J7 ground connection of this triode Q1.
A sustained diode 1 is parallel with between the input of this relay R L1 and output.
The 3rd contact jaw J8 of this triode Q1 is connected successively with the link CTL2 of a current-limiting resistance R4, described MCU.
The 3rd contact jaw J8 of this triode Q1 is also connected with a pull down resistor R5, this pull down resistor R5 ground connection.
It also comprises an an electric capacity C1 and resistance R1, one end of this electric capacity C1 is connected with the first contact jaw J3 of bidirectional triode thyristor TR1, the other end of this electric capacity C1 is connected with resistance R1, and the other end of this resistance R1 is connected with the second contact jaw J4 of this bidirectional triode thyristor TR1.
The present invention is reasonable in design ingenious, and structure is simple, small volume, by arranging a bidirectional triode thyristor in parallel with relay contacts end.Before needs relay connects or disconnects circuit, first allow bidirectional triode thyristor conducting 20ms and then engage relay, finally disconnected bidirectional triode thyristor.Like this, because bidirectional triode thyristor is noncontacting switch, load connected by relay would not have sparking to occur, and such relay life will extend, and extends the relay failure time greatly, and apparatus failure rate also can reduce.When we want disconnecting consumers, we can first connect bidirectional triode thyristor 20ms, then disconnect relay, finally disconnect bidirectional triode thyristor again.Because bidirectional triode thyristor is short for turn-on time, do not need fin, therefore this circuit can be used on that some are higher to space requirement, can not produce again the place of very high ambient temperature.
And then be switched on or switched off relay, finally just disconnect bidirectional triode thyristor, because bidirectional triode thyristor is noncontacting switch, thus the phenomenon of sparking can be produced when the contact jaw that can be avoided relay is turned on or off.
As described in the present embodiment of the invention, with other Control large current load contact protection circuit of the same or similar structure of the present invention, all in scope.
Claims (9)
1. a Control large current load contact protection circuit; it comprises resistive or inductive load (RL), a relay (RL1); this resistive or one end of inductive load (RL) is connected with first contact jaw (J1) of relay (RL1); this resistive or other end of inductive load (RL), second contact jaw (J2) of this relay (RL1) are connected with power supply respectively; thus formation loop, this is characterized in that: be parallel with a bidirectional triode thyristor (TR1) between first contact jaw (J1) of this relay (RL1), the second contact jaw (J2).
2. Control large current load contact protection circuit according to claim 1; it is characterized in that; first contact jaw (J3) of this bidirectional triode thyristor (TR1) is connected with first contact jaw (J1) of relay (RL1), and second contact jaw (J4) of this bidirectional triode thyristor (TR1) is connected with second contact jaw (J2) of relay (RL1).
3. Control large current load contact protection circuit according to claim 2, it is characterized in that, the 3rd contact jaw (J5) of this bidirectional triode thyristor (TR1) is connected successively with the link (CTL1) of a current-limiting resistance (R2), a MCU.
4. Control large current load contact protection circuit according to claim 3, it is characterized in that, the 3rd contact jaw (J5) of this bidirectional triode thyristor (TR1) is also connected with a current-limiting resistance (R3), this current-limiting resistance (R3) ground connection.
5. Control large current load contact protection circuit according to claim 4; it is characterized in that; the output of this relay (RL1) is connected with first contact jaw (J6) of a triode (Q1), the second contact jaw (J7) ground connection of this triode (Q1).
6. Control large current load contact protection circuit according to claim 5, is characterized in that, be parallel with a fly-wheel diode (D1) between the input of this relay (RL1) and output.
7. Control large current load contact protection circuit according to claim 5, it is characterized in that, the 3rd contact jaw (J8) of this triode (Q1) is connected successively with the link (CTL2) of a current-limiting resistance (R4), described MCU.
8. Control large current load contact protection circuit according to claim 7, it is characterized in that, the 3rd contact jaw (J8) of this triode (Q1) is also connected with a pull down resistor (R5), this pull down resistor (R5) ground connection.
9. Control large current load contact protection circuit according to claim 2; it is characterized in that; it also comprises an electric capacity (C1) and a resistance (R1); one end of this electric capacity (C1) is connected with first contact jaw (J3) of bidirectional triode thyristor (TR1); the other end of this electric capacity (C1) is connected with resistance (R1), and the other end of this resistance (R1) is connected with second contact jaw (J4) of this bidirectional triode thyristor (TR1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410760984.3A CN104409281A (en) | 2014-12-12 | 2014-12-12 | Relay-controlled high-current load contact protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410760984.3A CN104409281A (en) | 2014-12-12 | 2014-12-12 | Relay-controlled high-current load contact protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104409281A true CN104409281A (en) | 2015-03-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410760984.3A Pending CN104409281A (en) | 2014-12-12 | 2014-12-12 | Relay-controlled high-current load contact protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104409281A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107959488A (en) * | 2017-11-28 | 2018-04-24 | 宁波盈科工业自动化有限公司 | A kind of solid-state relay circuit with short-circuit protection |
| CN108242794A (en) * | 2018-03-08 | 2018-07-03 | 厦门芯阳科技股份有限公司 | A kind of relay contact protection circuit of control inductive load |
| CN108742102A (en) * | 2018-05-25 | 2018-11-06 | 九阳股份有限公司 | A kind of control method of food processor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1840922A1 (en) * | 2006-03-30 | 2007-10-03 | Alcatel Lucent | Electrical circuit for a self-retaining relay |
| CN101577191A (en) * | 2009-06-02 | 2009-11-11 | 深圳市英唐智能控制股份有限公司 | Method for protecting contact point of relay in high-power circuit and protection circuit |
| CN203225213U (en) * | 2013-03-22 | 2013-10-02 | 深圳市慧锐通智能电器股份有限公司 | A protecting circuit used for protecting contacts of a relay |
| CN103715022A (en) * | 2013-12-18 | 2014-04-09 | 北海市深蓝科技发展有限责任公司 | Self-adaptive micro-jitter magnetic latching relay zero-cross on-off control device |
| CN204315471U (en) * | 2014-12-12 | 2015-05-06 | 东莞市精诚电能设备有限公司 | A kind of Control large current load contact protection circuit |
-
2014
- 2014-12-12 CN CN201410760984.3A patent/CN104409281A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1840922A1 (en) * | 2006-03-30 | 2007-10-03 | Alcatel Lucent | Electrical circuit for a self-retaining relay |
| CN101577191A (en) * | 2009-06-02 | 2009-11-11 | 深圳市英唐智能控制股份有限公司 | Method for protecting contact point of relay in high-power circuit and protection circuit |
| CN203225213U (en) * | 2013-03-22 | 2013-10-02 | 深圳市慧锐通智能电器股份有限公司 | A protecting circuit used for protecting contacts of a relay |
| CN103715022A (en) * | 2013-12-18 | 2014-04-09 | 北海市深蓝科技发展有限责任公司 | Self-adaptive micro-jitter magnetic latching relay zero-cross on-off control device |
| CN204315471U (en) * | 2014-12-12 | 2015-05-06 | 东莞市精诚电能设备有限公司 | A kind of Control large current load contact protection circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107959488A (en) * | 2017-11-28 | 2018-04-24 | 宁波盈科工业自动化有限公司 | A kind of solid-state relay circuit with short-circuit protection |
| CN107959488B (en) * | 2017-11-28 | 2023-08-15 | 宁波盈科工业自动化有限公司 | Solid-state relay circuit with short-circuit protection |
| CN108242794A (en) * | 2018-03-08 | 2018-07-03 | 厦门芯阳科技股份有限公司 | A kind of relay contact protection circuit of control inductive load |
| CN108242794B (en) * | 2018-03-08 | 2023-05-23 | 厦门芯阳科技股份有限公司 | Relay contact protection circuit for controlling inductive load |
| CN108742102A (en) * | 2018-05-25 | 2018-11-06 | 九阳股份有限公司 | A kind of control method of food processor |
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Application publication date: 20150311 |
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| RJ01 | Rejection of invention patent application after publication |