CN208241298U - A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube - Google Patents
A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube Download PDFInfo
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- CN208241298U CN208241298U CN201820515232.4U CN201820515232U CN208241298U CN 208241298 U CN208241298 U CN 208241298U CN 201820515232 U CN201820515232 U CN 201820515232U CN 208241298 U CN208241298 U CN 208241298U
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Abstract
A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube; including power input; power output end; a load resistance R1 is connected between power input anode and power output end anode; power input cathode and power output end cathode are commonly connected to circuit cathode, and there are also the N-channel FET switch circuits of detection power output end short-circuit conditions and the P-channel field-effect transistor (PEFT) pipe switching circuit controlled by N-channel FET switch circuit between power input and power output end.The utility model is by N-channel FET switch circuit and P-channel field-effect transistor (PEFT) pipe switching circuit disconnecting circuit circuit, protection power source, and has self-recovering function, and device used is less, structurally simple, economical reliable and have a wide range of application.
Description
Technical field
The utility model relates to short-circuit protection circuit fields, and in particular to a kind of power supply or battery based on field-effect tube from
Restore short-circuit protection circuit.
Background technique
Currently on the market, power supply output self- recoverage short-circuit protection circuit has several: one, being sampled using power resistor, then
It is transmitted to pwm chip with the relatively rear high level signal of voltage reference or low level signal with comparator, then has control chip to stop
Only power；Device used in such circuit is more, and also only exists and just use in the circuit for controlling chip；Two, using after
Electric appliance mode, if short circuit disconnects relay, this mode key is not required in power volume and output power
In the case of use, because if output power is larger, just will increase using relay volume, versatility is bad, electricity in the market
Pond powers based on both of these case.
Both above to have the defects that following aspect: one, component is more, complex, and also has a fixed limit
Degree can only use in the power supply for having control chip, also less economical；Two, power volume and power wants in power supply design
In the circuit asked, relay has apparent defect.
Utility model content
The purpose of this utility model is that: it solves current existing power supply output self- recoverage short-circuit protection circuit and uses component
More, circuit is complicated, the larger problem of occupied space, provides one kind that is structurally simple, economical reliable and having a wide range of application and is based on
The power supply or battery of field-effect tube export self- recoverage short-circuit protection circuit.
The technical solution adopted in the utility model is as follows:
A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube, including power input, power supply are defeated
Outlet is connected to a load resistance R1, power input cathode and electricity between power input anode and power output end anode
Source output terminal cathode is commonly connected to circuit cathode, and there are also detection power output end is short between power input and power output end
The N-channel FET switch circuit of road situation and the P-channel field-effect transistor (PEFT) pipe controlled by N-channel FET switch circuit switch
Circuit.
Further, the P-channel field-effect transistor (PEFT) pipe switching circuit controlled by N-channel FET switch circuit includes resistance
R2 and P-channel field-effect transistor (PEFT) pipe, the one end resistance R2 are connect with power input anode, the resistance R2 other end and P-channel field-effect transistor (PEFT) pipe
The connection of the pole G, the P-channel field-effect transistor (PEFT) pole pipe S are connect with power input anode, the P-channel field-effect transistor (PEFT) pole pipe D and power output end anode
Connection.
Further, the N-channel FET switch circuit of the detection power output end short-circuit conditions includes resistance R3 and N
Channel field-effect pipe, the one end resistance R3 are connect with power output end anode, and the resistance R3 other end and the pole N-channel field-effect tube G connect
It connects, the N-channel pole field-effect tube S is connect with the pole P-channel field-effect transistor (PEFT) pipe G, and the pole N-channel field-effect tube D is connect with power cathode.
In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are:
1, the utility model in power output end short circuit, imitate by the N-channel field by detecting power output end short-circuit conditions
Should pipe switching circuit and the P-channel field-effect transistor (PEFT) pipe switching circuit disconnecting circuit circuit that is controlled by N-channel FET switch circuit,
Protection power source, circuit provides electric current, N-channel FET switch circuit and P-channel field effect by load resistance R1 after short circuit releases
Should pipe switching circuit conducting, be restored to normal power supply state, realize the protection circuit of power supply short circuit and have self-recovering function, institute
It is less with device, it is structurally simple, economical reliable and have a wide range of application；
2, the utility model is used as circuit switch device, power consumption using N-channel field-effect tube and P-channel field-effect transistor (PEFT) pipe switch
Small, performance is stablized, and is not easy to be secondary breakdown.
Detailed description of the invention
Fig. 1 is the utility model circuit diagram.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube, including power input, power supply are defeated
Outlet is connected to a load resistance R1, power input cathode and electricity between power input anode and power output end anode
Source output terminal cathode is commonly connected to circuit cathode, and there are also detection power output end is short between power input and power output end
The N-channel FET switch circuit of road situation and the P-channel field-effect transistor (PEFT) pipe controlled by N-channel FET switch circuit switch
Circuit.
Further, the P-channel field-effect transistor (PEFT) pipe switching circuit controlled by N-channel FET switch circuit includes resistance
R2 and P-channel field-effect transistor (PEFT) pipe, the one end resistance R2 are connect with power input anode, the resistance R2 other end and P-channel field-effect transistor (PEFT) pipe
The connection of the pole G, the P-channel field-effect transistor (PEFT) pole pipe S are connect with power input anode, the P-channel field-effect transistor (PEFT) pole pipe D and power output end anode
Connection.
Further, the N-channel FET switch circuit of the detection power output end short-circuit conditions includes resistance R3 and N
Channel field-effect pipe, the one end resistance R3 are connect with power output end anode, and the resistance R3 other end and the pole N-channel field-effect tube G connect
It connects, the N-channel pole field-effect tube S is connect with the pole P-channel field-effect transistor (PEFT) pipe G, and the pole N-channel field-effect tube D is connect with power cathode.
In normal use: the anode of output end is that have certain voltage in output circuit, makes N-channel by resistance R3
The voltage of the pole G of field-effect tube is also high level, and N-channel field-effect tube is connected, while N-channel field-effect tube is connected, P ditch
The pole G of road field-effect tube is directly conducting to circuit cathode by N-channel field-effect tube, so that the pole G of P-channel field-effect transistor (PEFT) pipe keeps low
Current potential, the conducting of P-channel field-effect transistor (PEFT) pipe, supply current all can be directly output to output end from s, D of P-channel field-effect transistor (PEFT) pipe, only
There is small power consumption in field-effect tube, holding circuit is unimpeded.
In output short-circuit: the anode of accessory power outlet is short-circuited to the cathode of circuit, voltage zero, N ditch in output circuit
The voltage of the pole G of road field-effect tube is also zero, the cut-off of N-channel field-effect tube, and the pole G of P-channel field-effect transistor (PEFT) pipe is straight by resistance R2
It is connected to the anode of input circuit, so that the pole G of P-channel field-effect transistor (PEFT) pipe keeps high potential, the cut-off of P-channel field-effect transistor (PEFT) pipe is exported back
Road disconnects, circuit to guard mode, plays the purpose of protection input power.
After short circuit releases, electric routing resistance R1, R2 provide high level, and N-channel field-effect tube is opened, and are restored to normal power supply
State.
Embodiment one
A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube, as shown, including power input
Socket J1, power output socket J2 are connected to a load between power input socket J1 anode and power output socket J2 anode
Resistance R1, power input socket J1 cathode and power output socket J2 cathode are commonly connected to circuit cathode, power input socket
There are also the N-channel FET switch circuit of detection power output end short-circuit conditions and by N between J1 and power output socket J2
The P-channel field-effect transistor (PEFT) pipe switching circuit of channel field-effect pipe switching circuit control.It is controlled by N-channel FET switch circuit
P-channel field-effect transistor (PEFT) pipe switching circuit includes resistance R2 and P-channel field-effect transistor (PEFT) pipe Q1, and the one end resistance R2 and power input anode connect
It connects, the resistance R2 other end is connect with the pole G of P-channel field-effect transistor (PEFT) pipe Q1, and the pole S of P-channel field-effect transistor (PEFT) pipe Q1 and power input are rectified
Pole connection, the pole D of P-channel field-effect transistor (PEFT) pipe Q1 is connect with power output socket J2 anode.Detect the N of power output end short-circuit conditions
Channel field-effect pipe switching circuit includes resistance R3 and N-channel field-effect tube Q2, and the one end resistance R3 and power output socket J2 are just
Pole connection, the resistance R3 other end are connect with the pole G of N-channel field-effect tube Q2, the pole S and P-channel field of N channel field-effect pipe Q2
The pole G of effect pipe Q1 connects, and the pole D of N-channel field-effect tube Q2 is connect with power cathode.
Claims (3)
1. a kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube, including power input, power supply output
End, it is characterised in that: be connected to a load resistance R1, power input between power input anode and power output end anode
Cathode and power output end cathode are commonly connected to circuit cathode, and there are also detection power supplys between power input and power output end
The N-channel FET switch circuit of output end short-circuit conditions and the P-channel field controlled by N-channel FET switch circuit effect
It should pipe switching circuit.
2. a kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube according to claim 1, special
Sign is: the P-channel field-effect transistor (PEFT) pipe switching circuit controlled by N-channel FET switch circuit includes resistance R2 and P ditch
Road field-effect tube, the one end resistance R2 are connect with power input anode, and the resistance R2 other end is connect with the pole P-channel field-effect transistor (PEFT) pipe G,
The P-channel field-effect transistor (PEFT) pole pipe S is connect with power input anode, and the P-channel field-effect transistor (PEFT) pole pipe D is connect with power output end anode.
3. a kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube according to claim 1, special
Sign is: the N-channel FET switch circuit of the detection power output end short-circuit conditions includes resistance R3 and N-channel field effect
Ying Guan, the one end resistance R3 are connect with power output end anode, and the resistance R3 other end is connect with the pole N-channel field-effect tube G, N-channel
The pole field-effect tube s is connect with the pole P-channel field-effect transistor (PEFT) pipe G, and the pole N-channel field-effect tube D is connect with power cathode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820515232.4U CN208241298U (en) | 2018-04-11 | 2018-04-11 | A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820515232.4U CN208241298U (en) | 2018-04-11 | 2018-04-11 | A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208241298U true CN208241298U (en) | 2018-12-14 |
Family
ID=64587425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820515232.4U Expired - Fee Related CN208241298U (en) | 2018-04-11 | 2018-04-11 | A kind of power supply or battery self- recoverage short-circuit protection circuit based on field-effect tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208241298U (en) |
-
2018
- 2018-04-11 CN CN201820515232.4U patent/CN208241298U/en not_active Expired - Fee Related
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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: 20181214 Termination date: 20190411 |