CN207116332U - Safety type relay control circuit - Google Patents
Safety type relay control circuit Download PDFInfo
- Publication number
- CN207116332U CN207116332U CN201721144455.6U CN201721144455U CN207116332U CN 207116332 U CN207116332 U CN 207116332U CN 201721144455 U CN201721144455 U CN 201721144455U CN 207116332 U CN207116332 U CN 207116332U
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- CN
- China
- Prior art keywords
- electric capacity
- diode
- resistor
- triode
- operational amplifier
- 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.)
- Expired - Fee Related
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Abstract
A kind of safety type relay control circuit,Microprocessor or microcontroller are electrically connected by 3rd resistor and the 4th electric capacity with the negative input end of operational amplifier,The positive input terminal ground connection of operational amplifier,Output end passes through the first electric capacity,First diode electrically connects with the base stage of triode,The output end of operational amplifier is electrically connected by second resistance with the negative input end of operational amplifier,Also it is electrically connected to by the 3rd electric capacity between 3rd resistor and the 4th electric capacity,One end of 4th resistance is electrically connected between 3rd resistor and the 4th electric capacity,The other end is grounded,The base stage of triode is grounded by the second electric capacity and first resistor respectively,The negative electrode of second diode electrically connects with the anode of the first diode,The plus earth of second diode,The colelctor electrode of triode electrically connects with relay,Grounded emitter,Avoid due to program exception,The drawbacks of level caused by abnormal electrical power supply is exported so as to trigger the maloperation of relay extremely,Enhance the safety and reliability of control circuit.
Description
Technical field
The actuation techniques field of relay is the utility model is related to, electricity is controlled more particularly to a kind of safety type relay
Road, can be widely applied to some has the occasion of specific safety and reliability requirement, such as fire-fighting, elevator to relay operation
Deng application.
Background technology
Relay is a kind of conventional electromagnetic relay, is a kind of electronic control device, and it has control system (also known as defeated
Entry loop) and by control system (also known as output loop), be commonly used in automatic control circuit, it is actually with less
Electric current, relatively low voltage go to control larger current, one kind " automatic switch " of higher voltage.Automatic tune is played in circuit
Section, safeguard protection, change-over circuit etc. act on.The control terminal of electromagnetic relay produces magnetic field by low current and goes adhesive or release big
Voltage, high current end.
The control terminal circuit of usual relay is as shown in Figure 1：I.e. using a triode or metal-oxide-semiconductor come drive control side,
Its principle is：When the control signal being carried on resistance R1 is high, triode Q1 colelctor electrode and drain electrode turn on, relay
It is electric in control terminal, adhesive action then is produced in controlled end, controls big voltage, the high current signal of controlled end.Existing scheme
Advantage is that circuit is simple, (switch that relay is can be carried out using high low dc voltage is controlled) easy to control, but the party
Case also has distinct disadvantage：Usual high-low voltage signal is controlled by microprocessor or microcontroller, once microprocessor or
Micro-controller program exception or abnormal electrical power supply, it may cause to export uncontrolled, such as high level output always.Can so cause after
Electrical equipment is normally opened, causes potential hidden danger, especially ensures in the application scenario that some have safety requirements, generally use Redundant Control
The safety of system and reliable, but it is high to implement complicated cost.
Utility model content
The utility model is directed to problem and shortage existing for prior art, there is provided a kind of new safety type relay control
Circuit.
The utility model is that solve above-mentioned technical problem by following technical proposals：
The utility model provides a kind of safety type relay control circuit, and its feature is that it includes microprocessor or micro-
Controller, first resistor, second resistance, 3rd resistor, the 4th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electricity
Appearance, operational amplifier, the first diode, the second diode and triode；
First output end of the microprocessor or microcontroller is put by the 3rd resistor and the 4th electric capacity with the computing
The negative input end electrical connection of big device, the second output head grounding, the positive input terminal ground connection of the operational amplifier, output end by this
One electric capacity, first diode electrically connect with the base stage of the triode, and the output end of the operational amplifier passes through the second resistance
Electrically connected with the negative input end of the operational amplifier, the 3rd resistor and the 4th electric capacity are also electrically connected to by the 3rd electric capacity
Between, one end of the 4th resistance is electrically connected between the 3rd resistor and the 4th electric capacity, other end ground connection, the triode
Base stage is grounded by second electric capacity and the first resistor respectively, the anode of the negative electrode of second diode and first diode
Electrical connection, the plus earth of second diode, the colelctor electrode of the triode electrically connects with relay, grounded emitter.
It is preferred that the triode is NPN transistor.
It is preferred that the triode is metal-oxide-semiconductor (metal-oxide semiconductor fieldeffect transistor).
It is preferred that the metal-oxide-semiconductor is N-channel MOS pipe.
On the basis of common sense in the field is met, above-mentioned each optimum condition, can be combined, produce the utility model respectively compared with
Good example.
Positive effect of the present utility model is：
The control signal that the utility model only exports in microprocessor or microcontroller is shaking in certain setting range
When swinging frequency control signal, control relay circuit can just produce a level signal that can be used for opening relay, so
Avoid due to the drawbacks of level caused by program exception, abnormal electrical power supply is exported so as to trigger the maloperation of relay extremely, from
And it greatly strengthen the safety and reliability of control relay circuit.
Brief description of the drawings
Fig. 1 is the control terminal circuit diagram of general-purpose relay in the prior art.
Fig. 2 is the circuit diagram of the safety type relay control circuit of the utility model preferred embodiment.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, rather than whole embodiments.Based on the implementation in the utility model
Example, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made, all belongs to
In the scope of the utility model protection.
As shown in Fig. 2 the present embodiment provides a kind of safety type relay control circuit, it includes microprocessor or microcontroller
Device (microcontroller is shown in Fig. 2), second resistance R2,3rd resistor R3, the 4th resistance R4, the 3rd electric capacity C3, the 4th electric capacity
C4, operational amplifier A 1, the first electric capacity C1, the second electric capacity C2, first resistor R1, the first diode D1, the second diode D2 with
And triode Q1, wherein, triode Q1 is NPN transistor, and certainly, triode Q1 can also be N-channel MOS pipe.
Specifically electrical connection is：
First output end (corresponding ports A) of the microprocessor or microcontroller passes through the electricity of 3rd resistor R3 and the 4th
Appearance C4 electrically connects with the negative input end of the operational amplifier A 1, the second output end (corresponding ports C) ground connection, the operational amplifier A 1
Positive input terminal ground connection, output end pass through first electric capacity C1, the first diode D1 and triode Q1 base stage (corresponding end
Mouth B) electrical connection, the output end of the operational amplifier A 1 passes through second resistance R2 and the negative input end of the operational amplifier A 1 is electric
Connection, also it is electrically connected to by the 3rd electric capacity C3 between 3rd resistor R3 and the 4th electric capacity C4, the 4th resistance R4's
One end is electrically connected between 3rd resistor R3 and the 4th electric capacity C4, other end ground connection, and triode Q1 base stage is led to respectively
Cross the second electric capacity C2 and first resistor R1 ground connection, second diode D2 negative electrode and first diode D1 anode electricity
Connection, second diode D2 plus earth, triode Q1 colelctor electrode electrically connects with relay, grounded emitter.
As shown in Fig. 2 frequency of oscillation control signal is inputted by port A, first pass through between the first electric capacity C1 and microcontroller
Circuit be filtered, the first electric capacity C1 carries out DC-isolation, then passes through the first diode D1 and the second diode D2 and carries out
Conversion of the AC signal to direct current signal, first resistor R1 and the second electric capacity C2 be used for adjust alternating current-direct current signal conversion ratio because
Son.Frequency of oscillation control signal only in setting range is inputted by port A, just can produce one effectively in port B
Level controling signal is so as to driving relay to close.High level caused by being typically due to program or abnormal electrical power supply or the equal nothing of low level
Method produces effective control level in port B, so as to greatly improve the safety of relay control system in abnormal cases
Property.
Compared to existing general control relay circuit, the present embodiment has advantages below：
1st, it is safe and reliable
This programme compares simple Automatic level control, can avoid well because program exception and abnormal electrical power supply cause level
Extremely caused by the drawbacks of relay maloperation, so as to greatly improve the reliability of Control and security.
2nd, it is cost-effective
Use the safety approach of Redundant Control compared to other, this programme implement it is simple, to original system almost without hardware into
This increase, and microprocessor or microcontroller are also easy to produce a fixed frequency of oscillation control signal；Compared to when have
The program exception and abnormal electrical power supply of generation, the control circuit can avoid the relay maloperation under abnormality well,
The especially control of the powerful device of some associated safeties, greatly reduce controlling risk for the kind equipment.
Although the foregoing describing specific embodiment of the present utility model, it will be appreciated by those of skill in the art that
These are merely illustrative of, and the scope of protection of the utility model is defined by the appended claims.Those skilled in the art
Member can make numerous variations or repair to these embodiments on the premise of without departing substantially from principle of the present utility model and essence
Change, but these changes and modification each fall within the scope of protection of the utility model.
Claims (4)
- A kind of 1. safety type relay control circuit, it is characterised in that it include microprocessor or microcontroller, first resistor, Second resistance, 3rd resistor, the 4th resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, operational amplifier, One diode, the second diode and triode；First output end of the microprocessor or microcontroller passes through the 3rd resistor and the 4th electric capacity and the operational amplifier Negative input end electrical connection, the second output head grounding, the operational amplifier positive input terminal ground connection, output end pass through this first electricity Appearance, first diode are electrically connected with the base stage of the triode, and the output end of the operational amplifier by the second resistance and is somebody's turn to do The negative input end electrical connection of operational amplifier, also by the 3rd electric capacity be electrically connected to the 3rd resistor and the 4th electric capacity it Between, one end of the 4th resistance is electrically connected between the 3rd resistor and the 4th electric capacity, other end ground connection, the base of the triode Pole is grounded by second electric capacity and the first resistor respectively, the anode electricity of the negative electrode of second diode and first diode Connection, the plus earth of second diode, the colelctor electrode of the triode electrically connects with relay, grounded emitter.
- 2. safety type relay control circuit as claimed in claim 1, it is characterised in that the triode is NPN transistor.
- 3. safety type relay control circuit as claimed in claim 1, it is characterised in that the triode is metal-oxide-semiconductor.
- 4. safety type relay control circuit as claimed in claim 3, it is characterised in that the metal-oxide-semiconductor is N-channel MOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721144455.6U CN207116332U (en) | 2017-09-07 | 2017-09-07 | Safety type relay control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721144455.6U CN207116332U (en) | 2017-09-07 | 2017-09-07 | Safety type relay control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207116332U true CN207116332U (en) | 2018-03-16 |
Family
ID=61574784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721144455.6U Expired - Fee Related CN207116332U (en) | 2017-09-07 | 2017-09-07 | Safety type relay control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207116332U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358294A (en) * | 2018-12-03 | 2019-02-19 | 国网新疆电力有限公司乌鲁木齐供电公司 | Cell batteries open circuit online monitoring system |
| CN109585220A (en) * | 2018-10-31 | 2019-04-05 | 艾特仪表科技（深圳）有限公司 | The control circuit and its control method opened for dynamic driving relay |
-
2017
- 2017-09-07 CN CN201721144455.6U patent/CN207116332U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109585220A (en) * | 2018-10-31 | 2019-04-05 | 艾特仪表科技（深圳）有限公司 | The control circuit and its control method opened for dynamic driving relay |
| CN109358294A (en) * | 2018-12-03 | 2019-02-19 | 国网新疆电力有限公司乌鲁木齐供电公司 | Cell batteries open circuit online monitoring system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180316 Termination date: 20180907 |