CN209200655U - A kind of protection circuit avoiding relay short circuit frequent starting - Google Patents
A kind of protection circuit avoiding relay short circuit frequent starting Download PDFInfo
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- CN209200655U CN209200655U CN201821635750.6U CN201821635750U CN209200655U CN 209200655 U CN209200655 U CN 209200655U CN 201821635750 U CN201821635750 U CN 201821635750U CN 209200655 U CN209200655 U CN 209200655U
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Abstract
A kind of protection circuit avoiding relay short circuit frequent starting; including relay module; the switch input terminal of the relay module and the input terminal of ON-OFF control circuit connect; the output end of the ON-OFF control circuit is connect with the control terminal of the relay module; the control terminal of the ON-OFF control circuit and the output end of short-circuit protection circuit connect; the input terminal of the short-circuit protection circuit is control signal input; test side and one end of short-circuit detecting circuit connect, and the other end of the short-circuit detecting circuit is connect with the switch input terminal of the relay module.The utility model low cost, protection control circuit element is few, can easily be accommodated guard time, the relay output short circuit protection circuit of high reliablity improves reliability of relay in the case where output short-circuit.
Description
Technical field
The utility model relates to electronic technology fields, and in particular to a kind of protection electricity for avoiding relay short circuit frequent starting
Road.
Background technique
There are mainly two types of situations for existing relay control: 1. sampling accessory power supplys individually give relay enabled power supply；This side
Formula advantage: after relay output short-circuit, not needing short-circuit protection, lean on DC converter or Switching Power Supply, per se with short circuit protect
Protective function realizes protection, and disadvantage: needing to increase independent accessory power supply, at high cost.2. it is enabled to relay to sample itself output
Power supply；This mode advantage: not needing to increase accessory power supply, at low cost；Disadvantage: when output short-circuit, relay controls supply voltage
Output is followed to be short-circuited together, this moment cut-off, then relay input voltage restores, enabled also to restore simultaneously, relay
Device is again turned on, and due to relay output short-circuit, relay is again switched off, and is so recycled, since frequency reaches 500HZ/
S, relay will be damaged in short time due to frequently switching on.
Utility model content
One, the technical issues of solving
It is proposed a kind of simple circuit, it is low in cost, the time can be controlled by regulating relay as needed, avoid occurring in short circuit
When, relay takes place frequently the protection circuit for avoiding relay short circuit frequent starting of starting.
Two, specific technical solution
A kind of protection circuit avoiding relay short circuit frequent starting, including relay module, the relay module
The connection of the input terminal of switch input terminal and ON-OFF control circuit, the output end of the ON-OFF control circuit and the relay module
Control terminal connection, the control terminal of the ON-OFF control circuit and the output end of short-circuit protection circuit connect, the short-circuit protection circuit
Input terminal be control signal input, one end of test side and short-circuit detecting circuit connects, the short-circuit detecting circuit it is another
End is connect with the switch input terminal of the relay module.
When relay work, control signal is issued to short-circuit protection circuit and is instructed, and is issued and is controlled by short-circuit protection circuit
Its ON-OFF control circuit is connected in signal processed, and the electromagnetic coil in relay module obtains electric, closes the switch；
When relay is in the presence of short-circuit, short-circuit detecting circuit output control information, cutting control signal input is broken
The power supply of open relay electromagnetic coil, while short-circuit protection circuit start-up study startup function, prevent relay frequent starting.
Preferably to realize the utility model, further are as follows:
The short-circuit protection circuit is provided with triode Q6, and the collector of triode Q6 is through resistance R42 and control signal
Connection, emitter are connect with the control terminal of the ON-OFF control circuit, and base stage is grounded after capacitor C25, in the triode Q6
Base stage and collector between also bridging have a resistance R45, and the base stage of triode Q6 is the test side of circuit.
The ON-OFF control circuit is provided with triode Q2, the emitter of triode Q2 and opening for the relay module
Input terminal connection is closed, collector is connect with the control terminal of the relay module, and base stage is all the way through resistance R10 and the relay
The switch input terminal of module connects, and another way is connect through resistance R13 with the collector of triode Q8, the emitter of triode Q8
Ground connection, base stage is connect after resistance R35 with the output end of the short-circuit protection circuit, in the base stage and transmitting of the triode Q8
Also bridging has resistance R36 between pole.
The short-circuit detecting circuit is provided with diode D13, the cathode of diode D13 and opening for the relay module
Input terminal connection is closed, the positive test side with the short-circuit protection circuit is connect.
The utility model has the following beneficial effects: inexpensive, protection control circuit element is few, can easily be accommodated guard time, can
The relay output short circuit protection circuit high by property, improves reliability of relay in the case where output short-circuit；Pass through tune
Economize on electricity resistance value, which can be realized, controls length of time different demands to relay, avoids relay when there is short circuit, frequently opens
Dynamic, damage switch reaches the function of protective relay.
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 protection circuit avoiding relay short circuit frequent starting as shown in Figure 1:, including relay module, it is described after
The input terminal of the switch input terminal of electrical appliance module and ON-OFF control circuit connects, the output end of the ON-OFF control circuit and it is described after
The control terminal of electrical appliance module connects, and the control terminal of the ON-OFF control circuit and the output end of short-circuit protection circuit connect, this is short
It is control signal input, one end connection of test side and short-circuit detecting circuit, the short-circuit detecting that the input terminal of circuit is protected on road
The other end of circuit is connect with the switch input terminal of the relay module.
As shown in Figure 2: wherein short-circuit protection circuit is provided with triode Q6, and the collector of triode Q6 is through resistance R42
It is connect with control signal, emitter is connect with the control terminal of the ON-OFF control circuit, and base stage is grounded after capacitor C25, in institute
It states also to bridge between the base stage and control signal end of triode Q6 and has resistance R45, and the base stage of triode Q6 is the detection of circuit
End.
The ON-OFF control circuit is provided with triode Q2, the emitter of triode Q2 and opening for the relay module
Input terminal connection is closed, collector is connect with the control terminal of the relay module, and base stage is all the way through resistance R10 and relay module
Switch input terminal connection, another way connect through resistance R13 with the collector of triode Q8, and the emitter of triode Q8 connects
Ground, base stage are connect after resistance R35 with the anode of diode D14, and the cathode of diode D14 and the emitter of triode Q6 connect
Connect, and the cathode of diode D14 is also grounded after capacitor C16, between the base stage and emitter of the triode Q8 also across
It is connected to resistance R36.
The short-circuit detecting circuit is provided with diode D13, the cathode of diode D13 and opening for the relay module
Input terminal connection is closed, anode is connect with the base stage of triode Q6.
Working principle: relay is detected there are when short-circuit conditions by diode D13, diode D13 is by triode Q6
Driving voltage discharges into 0.7V, this moment cut-off, when relay, which inputs, to be restored, is filled by resistance R45 to capacitor C25
Electricity, as charging voltage > 6.5V, relay realizes delayed start-up, hereafter since relay exports sustained short-circuit, relay input
It is short-circuited as 0 current potential, diode D13 discharges into 0.7V, cut-off, this mode iterative cycles to triode Q6 driving.By
Opening in relay has delay, therefore switch can only recycle at a slow speed, so that protective relay will not be opened frequently in a short time
It opens and damages；The relay open time delay time can be realized by adjusting resistance R45 resistance value and capacitor C25 capacitance.
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 (4)
1. a kind of protection circuit for avoiding relay short circuit frequent starting, including relay module, it is characterised in that: the relay
The switch input terminal of device module and the input terminal of ON-OFF control circuit connect, the output end of the ON-OFF control circuit and the relay
The control terminal of device module connects, and the control terminal of the ON-OFF control circuit and the output end of short-circuit protection circuit connect, the short circuit
The input terminal for protecting circuit is control signal input, one end connection of test side and short-circuit detecting circuit, short-circuit detecting electricity
The other end on road is connect with the switch input terminal of the relay module.
2. avoiding the protection circuit of relay short circuit frequent starting according to claim 1, it is characterised in that: the short circuit is protected
Protection circuit is provided with triode Q6, and the collector of triode Q6 is connect through resistance R42 with control signal, and emitter is opened with described
The control terminal connection of control circuit is closed, base stage is grounded after capacitor C25, between the base stage and collector of the triode Q6 also
Bridging has resistance R45, and the base stage of triode Q6 is the test side of circuit.
3. avoiding the protection circuit of relay short circuit frequent starting according to claim 1, it is characterised in that: the switch control
Circuit processed is provided with triode Q2, and the emitter of triode Q2 is connect with the switch input terminal of the relay module, current collection
Pole is connect with the control terminal of the relay module, the base stage switch input terminal through resistance R10 Yu the relay module all the way
Connection, another way are connect through resistance R13 with the collector of triode Q8, and the emitter ground connection of triode Q8, base stage is through resistance
It is connect after R35 with the output end of the short-circuit protection circuit, also bridging has between the base stage and emitter of the triode Q8
Resistance R36.
4. avoiding the protection circuit of relay short circuit frequent starting according to claim 1, it is characterised in that: the short circuit inspection
Slowdown monitoring circuit is provided with diode D13, and the cathode of diode D13 is connect with the switch input terminal of the relay module, anode
It is connect with the test side of the short-circuit protection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821635750.6U CN209200655U (en) | 2018-10-09 | 2018-10-09 | A kind of protection circuit avoiding relay short circuit frequent starting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821635750.6U CN209200655U (en) | 2018-10-09 | 2018-10-09 | A kind of protection circuit avoiding relay short circuit frequent starting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209200655U true CN209200655U (en) | 2019-08-02 |
Family
ID=67407543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821635750.6U Active CN209200655U (en) | 2018-10-09 | 2018-10-09 | A kind of protection circuit avoiding relay short circuit frequent starting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209200655U (en) |
-
2018
- 2018-10-09 CN CN201821635750.6U patent/CN209200655U/en active Active
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