CN206962419U - A kind of power supply short-circuit protective circuit with adaptive ability - Google Patents
A kind of power supply short-circuit protective circuit with adaptive ability Download PDFInfo
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- CN206962419U CN206962419U CN201720928160.1U CN201720928160U CN206962419U CN 206962419 U CN206962419 U CN 206962419U CN 201720928160 U CN201720928160 U CN 201720928160U CN 206962419 U CN206962419 U CN 206962419U
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Abstract
The utility model discloses a kind of power supply short-circuit protective circuit with adaptive ability, including is connected in parallel the capacitance-resistance voltage reduction circuit formed, full bridge rectifier T, three terminal regulator chip IC 1 and photo-coupler IC2 by resistance R4 and electric capacity C2；One end of the capacitance-resistance voltage reduction circuit is connected with line voltage, and the other end of capacitance-resistance voltage reduction circuit is connected with full bridge rectifier T voltage input end.Principle of the utility model based on light-coupled isolation realizes the short-circuit protection warning function to DC load; circuit is used as short-circuit protection detecting element by the use of relay and triode; when running into short-circuit conditions; can not only disconnecting consumers supply line; and it can also send alarm; the timely queueing problem of user is reminded, while circuit have also been devised delay cell, prevent false triggering and the frequent shake of circuit.
Description
Technical field
A kind of short-circuit protection circuit is the utility model is related to, specifically a kind of power source short-circuit protection with adaptive ability
Circuit.
Background technology
With the continuous improvement of people's living standards, electronic equipment has become a part essential in life, especially
It is that various household electrical appliance bring great convenience to life, the work of people, supply tool of this kind of electronic installation to electric energy
There is higher requirement.The protection of especially to short circuit situations such as, once short circuit or overvoltage occur for load, then it may burn electricity consumption
Equipment, larger economic loss is caused, can also be caused casualties when serious, existing protection circuit is mostly complicated, system
It is higher to make cost, function is more single.
The content of the invention
The purpose of this utility model is to provide a kind of power supply with adaptive ability simple in construction, easy to use short
Road protection circuit, to solve the problems mentioned in the above background technology.
To achieve the above object, the utility model provides following technical scheme：
A kind of power supply short-circuit protective circuit with adaptive ability, including be connected in parallel and formed by resistance R4 and electric capacity C2
Capacitance-resistance voltage reduction circuit, full bridge rectifier T, three terminal regulator chip IC 1 and photo-coupler IC2；The resistance-capacitance depressurization electricity
The one end on road is connected with line voltage, and the other end of capacitance-resistance voltage reduction circuit is connected with full bridge rectifier T voltage input end
Connect, full bridge rectifier T the voltage output end voltage input end with three terminal regulator chip IC 1, voltage-regulator diode D1 respectively
Negative electrode, resistance R2, unidirectional thyristor Q1 anode, relay K contact K-2 be connected, the electricity of three terminal regulator chip IC 1
Defeated place end is pressed to connect resistance R1 and relay K contact K-1 respectively, the relay K contact K-1 other end is connected with load P
Connect, the anode of resistance R1 other end connection photo-coupler IC2 interior light emitting diodes, the pole of photo-coupler IC2 internal illuminations two
The minus earth of pipe, resistance the R2 other end connection resistance R3, resistance the R3 other end connection unidirectional thyristor Q1 control pole,
Unidirectional thyristor Q1 negative electrode connection relay K.
As preferred scheme of the present utility model：Also it is connected in parallel on including electric capacity C1, the electric capacity C1 inside photo-coupler IC2
The both ends of light emitting diode.
As preferred scheme of the present utility model：Also connected including loudspeaker B, the loudspeaker B with relay K contact K-2
It is connected to afterwards between full bridge rectifier T voltage output end and earth terminal.
As preferred scheme of the present utility model：The model LM7812 of the three terminal regulator chip IC 1.
As preferred scheme of the present utility model：The model 4N25 of the photo-coupler IC2.
As preferred scheme of the present utility model：The relay K is many-contact relay.
Compared with prior art, the beneficial effects of the utility model are：Principle of the utility model based on light-coupled isolation is real
Showed the short-circuit protection warning function to DC load, circuit by the use of relay and triode as short-circuit protection detecting element,
When running into short-circuit conditions, can not only disconnecting consumers supply line, and can also send alarm, remind user to arrange in time
Except problem, while circuit have also been devised delay cell, prevent false triggering and the frequent shake of circuit.
Brief description of the drawings
Fig. 1 is the circuit diagram of the power supply short-circuit protective circuit with adaptive ability.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Referring to Fig. 1, a kind of power supply short-circuit protective circuit with adaptive ability, including by resistance R4 and electric capacity C2 simultaneously
Capacitance-resistance voltage reduction circuit, full bridge rectifier T, three terminal regulator chip IC 1 and the photo-coupler IC2 of connection connection composition；It is described
One end of capacitance-resistance voltage reduction circuit is connected with line voltage, the other end of capacitance-resistance voltage reduction circuit and full bridge rectifier T voltage
Input is connected, the full bridge rectifier T voltage output end voltage input end with three terminal regulator chip IC 1, steady respectively
Pressure diode D1 negative electrode, resistance R2, unidirectional thyristor Q1 anode, relay K contact K-2 is connected, three terminal regulator
The defeated place end of voltage of chip IC 1 connects resistance R1 and relay K contact K-1, the relay K contact K-1 other end respectively
It is connected with load P, the anode of resistance R1 other end connection photo-coupler IC2 interior light emitting diodes, in photo-coupler IC2
The minus earth of portion's light emitting diode, resistance the R2 other end connection resistance R3, resistance R3 other end connection unidirectional thyristor
Q1 control pole, unidirectional thyristor Q1 negative electrode connection relay K.
Also the both ends of photo-coupler IC2 interior light emitting diodes are connected in parallel on including electric capacity C1, the electric capacity C1.Also include loudspeaker
B, loudspeaker B and relay K contact K-2 are connected between full bridge rectifier T voltage output end and earth terminal after connecting.
The model LM7812 of three terminal regulator chip IC 1.Photo-coupler IC2 model 4N25.Relay K is multiconductor relay
Device.
Operation principle of the present utility model is：Electric main is first passed around after capacitance-resistance voltage reduction circuit is depressured by whole
Flow bridge T and carry out rectification, DC voltage is exported to after after three terminal regulator IC1 voltage stabilizings from the DC voltage that rectifier bridge T is exported
The circuit power supply in face, its repeat circuit K contact K-1 is normally-closed contact, and the electric loop for loading P is connected, normal work, now
Voltage is also added in optical coupling IC2 light emitting diode part by resistance R1, the LEDs ON inside chip IC 2, its
Therefore internal phototriode turn on, thus by resistance R2 voltage by 4 pin of chip IC 1 and 3 pin to, unidirectionally
IGCT Q1 control pole undertension is to turn it on, when running into P and occurring short-circuit, now 3 pin output voltages of chip IC 1
Fallen down to the ground by K-1 and P, be similar to short circuit, therefore resistance R1 and optical coupling IC2 are short-circuited, the interior light emitting diodes of chip IC 2 and
Phototriode is disconnected, and now unidirectional thyristor Q1 control pole tension rise, Q1 conductings, relay K electric loops are connected,
Its contact K-1 disconnects, and reaches protection P purpose, while the K-2 adhesives of its contact, loudspeaker B sends alarm, as short-circuit protection
Sound, electric capacity C1 are delay cell, because its both end voltage can not be mutated and the characteristic of discharge and recharge, have just been occurred in short circuit short
In time, circuit is simultaneously failure to actuate, and prevents the generation of false triggering and shake.
Claims (6)
1. a kind of power supply short-circuit protective circuit with adaptive ability, including it is connected in parallel what is formed by resistance R4 and electric capacity C2
Capacitance-resistance voltage reduction circuit, full bridge rectifier T, three terminal regulator chip IC 1 and photo-coupler IC2；Characterized in that, the resistance
The one end for holding reduction voltage circuit is connected with line voltage, and the voltage of the other end and full bridge rectifier T of capacitance-resistance voltage reduction circuit is defeated
Enter end to be connected, the full bridge rectifier T voltage output end voltage input end with three terminal regulator chip IC 1, voltage stabilizing respectively
Diode D1 negative electrode, resistance R2, unidirectional thyristor Q1 anode, relay K contact K-2 is connected, three terminal regulator core
The piece IC1 defeated place end of voltage connects resistance R1 and relay K contact K-1 respectively, the relay K contact K-1 other end with
Load P is connected, the anode of resistance R1 other end connection photo-coupler IC2 interior light emitting diodes, inside photo-coupler IC2
The minus earth of light emitting diode, resistance the R2 other end connection resistance R3, resistance R3 other end connection unidirectional thyristor Q1
Control pole, unidirectional thyristor Q1 negative electrode connection relay K.
2. a kind of power supply short-circuit protective circuit with adaptive ability according to claim 1, it is characterised in that also wrap
Include electric capacity C1, the electric capacity C1 and be connected in parallel on the both ends of photo-coupler IC2 interior light emitting diodes.
3. a kind of power supply short-circuit protective circuit with adaptive ability according to claim 1, it is characterised in that also wrap
Include loudspeaker B, the loudspeaker B and full bridge rectifier T voltage output end is connected to after being connected with relay K contact K-2 with connecing
Between ground terminal.
4. a kind of power supply short-circuit protective circuit with adaptive ability according to claim 1, it is characterised in that described
The model LM7812 of three terminal regulator chip IC 1.
5. a kind of power supply short-circuit protective circuit with adaptive ability according to claim 1, it is characterised in that described
Photo-coupler IC2 model 4N25.
6. a kind of power supply short-circuit protective circuit with adaptive ability according to claim 1, it is characterised in that described
Relay K is many-contact relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720928160.1U CN206962419U (en) | 2017-07-28 | 2017-07-28 | A kind of power supply short-circuit protective circuit with adaptive ability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720928160.1U CN206962419U (en) | 2017-07-28 | 2017-07-28 | A kind of power supply short-circuit protective circuit with adaptive ability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206962419U true CN206962419U (en) | 2018-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720928160.1U Active CN206962419U (en) | 2017-07-28 | 2017-07-28 | A kind of power supply short-circuit protective circuit with adaptive ability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206962419U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212493A (en) * | 2019-06-05 | 2019-09-06 | 珠海格力电器股份有限公司 | Protect circuit, mainboard and electrical equipment |
-
2017
- 2017-07-28 CN CN201720928160.1U patent/CN206962419U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212493A (en) * | 2019-06-05 | 2019-09-06 | 珠海格力电器股份有限公司 | Protect circuit, mainboard and electrical equipment |
| CN110212493B (en) * | 2019-06-05 | 2020-04-24 | 珠海格力电器股份有限公司 | Protection circuit, mainboard and consumer |
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