CN208797568U - A kind of relay output short circuit protection circuit - Google Patents
A kind of relay output short circuit protection circuit Download PDFInfo
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- CN208797568U CN208797568U CN201821636979.1U CN201821636979U CN208797568U CN 208797568 U CN208797568 U CN 208797568U CN 201821636979 U CN201821636979 U CN 201821636979U CN 208797568 U CN208797568 U CN 208797568U
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Abstract
A kind of relay output short circuit protection circuit; it is provided with relay module; the power end of the relay module is connected with power circuit; control terminal is connected with ON-OFF control circuit; signal acquisition circuit is connected on output end; it is additionally provided with main control chip, the input terminal of the main control chip is connect with the output end of the signal acquisition circuit, and the control terminal of the main control chip is connect with the input terminal of the ON-OFF control circuit.Relay output short circuit protection is realized in the cooperation of the utility model main control chip and circuit, and hardware circuit is simple, and the occupancy of hardware circuit is small in size, the use of main control chip, and modification is convenient, controls high sensitivity；Integrated circuit high reliablity realizes the entry-into-force time for being accurately controlled short-circuit protection and the reboot time after protection.
Description
Technical field
The utility model relates to technical field of electric control, and in particular to a kind of relay output short circuit protection circuit.
Background technique
For relay as one of common control element of electrical control control field, existing control relay circuit is spontaneous
Without short-circuit protection function, if there is short circuit, by the other component in system, such as power supply, fuse, it is passive to provide
Protection.Also there is the application for the protection for realizing short circuit by the way of control circuit in the prior art, is made of pure hardware circuit, it is former
Reason is complicated, higher cost, while more to the space hold of PCB when fabric swatch, is not suitable for minimizing, integrated applied field
Scape, while the control circuit of pure hardware, short-circuit entry-into-force time, recovery time can not all accomplish accurately to control.
Utility model content
One, the technical issues of solving
The utility model in view of the deficiencies of the prior art, proposes that a kind of structure is simple, easy to operate, and intelligence degree is high,
The relay output short circuit protection circuit for being accurately controlled short-circuit entry-into-force time with recovery time after short circuit may be implemented.
Two, specific technical solution
A kind of relay output short circuit protection circuit, is provided with relay module, the power end connection of the relay module
There is power circuit, control terminal is connected with ON-OFF control circuit, is connected with signal acquisition circuit on output end, is additionally provided with master control core
Piece, the input terminal of the main control chip are connect with the output end of the signal acquisition circuit, the control terminal of the main control chip and institute
State the input terminal connection of ON-OFF control circuit.
The utility model is realized in this way main control chip passes through signal acquisition circuit control relay module output end
The information such as voltage, electric current, when short-circuit conditions occurs in relay module output end, main control chip issues control signal, closes and surveys
Relay module plays defencive function.
Preferably to realize the utility model, further are as follows:
The ON-OFF control circuit is provided with triode Q1, and the collector of triode Q1 and the relay module control
The connection of coil negative terminal, emitter ground connection, base stage are connect after resistance R1 with the control terminal of the main control chip；In the triode
It is gone back between the base stage and emitter of Q1 and is connected to capacitor C1.
The signal acquisition circuit is provided with triode Q2, and the base stage of triode Q2 is grounded through resistance R5, the triode
The base stage of Q2 is connect also after resistance R4 with the anode of zener diode Z1, the cathode and the relay of zener diode Z1
The output end of module connects, and goes back between the anode and cathode of the zener diode Z1 and is connected to capacitor C2；The triode
The collector of Q2 is connect through resistance R2 with positive power source terminal, and the collector of triode Q2 is also defeated through resistance R3 and the main control chip
Enter end connection；The emitter of the triode Q2 is grounded, and between triode Q2 emitter and base stage and is connected to capacitor C3.
The utility model has the following beneficial effects: the cooperation of main control chip and circuit, realizes relay output short circuit protection, firmly
Part circuit is simple, and the occupancy of hardware circuit is small in size, the use of main control chip, and modification is convenient, controls high sensitivity；Integrated circuit
High reliablity realizes the entry-into-force time for being accurately controlled short-circuit protection and the reboot time after protection.
Detailed description of the invention
Fig. 1 is the structural block diagram of the utility model.
Fig. 2 is the circuit diagram of the utility model.
Specific embodiment
The preferred embodiment of the utility model is described in detail with reference to the accompanying drawing, so that the advantages of the utility model
It can be easier to be readily appreciated by one skilled in the art with feature, to make the protection scope of the utility model apparent clear
Define.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
A kind of relay output short circuit protection circuit as shown in Figure 1:, is provided with relay module, the relay module
Power end is connected with power circuit, which is that relay module and main control chip are powered, and wherein main control chip is using single
Piece machine completes control, and the electromagnetic coil negative terminal of relay module is connected with ON-OFF control circuit, is connected with signal on output end and adopts
Collector, main control chip are single-chip microcontroller, and the input terminal of the main control chip is connect with the output end of the signal acquisition circuit, described
The control terminal of main control chip is connect with the input terminal of the ON-OFF control circuit.
As shown in Figure 2: the power circuit is provided with diode D1, and the anode of diode D1 is connect with 5V power supply, should
The anode of electromagnetic coil in the cathode and relay module of diode D1 connects；
The ON-OFF control circuit is provided with triode Q1, and the collector of triode Q1 and the relay module control
The connection of coil negative terminal, the collector of triode Q1 are also connect with the anode of diode D2, the cathode of diode D2 and two poles
The cathode of pipe D1 connects, and emitter ground connection, base stage is connect after resistance R1 with the control terminal of the main control chip；In the three-level
It is gone back between the base stage and emitter of pipe Q1 and is connected to capacitor C1.
The signal acquisition circuit is provided with triode Q2, and the base stage of triode Q2 is grounded through resistance R5, the triode
The base stage of Q2 is connect also after resistance R4 with the anode of zener diode Z1, the cathode and the relay of zener diode Z1
The output end of module connects, and goes back between the anode and cathode of the zener diode Z1 and is connected to capacitor C2；The triode
The collector of Q2 is connect through resistance R2 with positive power source terminal, and the collector of triode Q2 is also defeated through resistance R3 and the main control chip
Enter end connection；The emitter of the triode Q2 is grounded, and between triode Q2 emitter and base stage and is connected to capacitor C3.
Working principle:
Power input is the power supply of entire circuit system, and+5V is by the other component supply in circuit system, for list
The work of piece machine is used.Single-chip microcontroller passes through resistance R1, controls cut-offfing for triode Q1, thus to control the actuation of relay module and release
It puts.The signal of relay module input terminal will be with power input altogether (non-isolated).By resistance R4 and R5 to relay module
Output voltage is sampled, and voltage collected is supplied to single-chip microcontroller after triode Q2 amplification, by adjusting two poles are rectified
The parameter of pipe Z1, resistance R4 and resistance R5 can be adapted for different input voltages, meet the needs of different application scene.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, subject to the scope of the utility model is defined by the following claims.
Claims (3)
1. a kind of relay output short circuit protection circuit, it is characterised in that: be provided with relay module, the electricity of the relay module
Source is connected with power circuit, and control terminal is connected with ON-OFF control circuit, is connected with signal acquisition circuit on output end, also sets up
There is main control chip, the input terminal of the main control chip is connect with the output end of the signal acquisition circuit, the control of the main control chip
End processed is connect with the input terminal of the ON-OFF control circuit.
2. relay output short circuit protection circuit according to claim 1, it is characterised in that: the ON-OFF control circuit setting
There is triode Q1, the collector of triode Q1 is connect with the relay module control coil negative terminal, emitter ground connection, base stage
It is connect after resistance R1 with the control terminal of the main control chip；It goes back and is connected between the base stage and emitter of the triode Q1
Capacitor C1.
3. relay output short circuit protection circuit according to claim 1, it is characterised in that: the signal acquisition circuit setting
Have triode Q2, the base stage of triode Q2 is grounded through resistance R5, the base stage of triode Q2 also after resistance R4 with pressure stabilizing two
The anode connection of pole pipe Z1, the cathode of zener diode Z1 is connect with the output end of the relay module, in the pressure stabilizing
It is gone back between the anode and cathode of diode Z1 and is connected to capacitor C2；
The collector of the triode Q2 is connect through resistance R2 with positive power source terminal, the collector of triode Q2 also through resistance R3 with
The main control chip input terminal connection；
The emitter of the triode Q2 is grounded, and between triode Q2 emitter and base stage and is connected to capacitor C3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821636979.1U CN208797568U (en) | 2018-10-09 | 2018-10-09 | A kind of relay output short circuit protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821636979.1U CN208797568U (en) | 2018-10-09 | 2018-10-09 | A kind of relay output short circuit protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208797568U true CN208797568U (en) | 2019-04-26 |
Family
ID=66211670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821636979.1U Active CN208797568U (en) | 2018-10-09 | 2018-10-09 | A kind of relay output short circuit protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208797568U (en) |
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2018
- 2018-10-09 CN CN201821636979.1U patent/CN208797568U/en active Active
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