CN206272219U - A kind of overvoltage and reverse-connection protection circuit and its equipment - Google Patents
A kind of overvoltage and reverse-connection protection circuit and its equipment Download PDFInfo
- Publication number
- CN206272219U CN206272219U CN201621237743.1U CN201621237743U CN206272219U CN 206272219 U CN206272219 U CN 206272219U CN 201621237743 U CN201621237743 U CN 201621237743U CN 206272219 U CN206272219 U CN 206272219U
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- overvoltage
- connection
- electric capacity
- equipment
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
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- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses a kind of overvoltage and reverse-connection protection circuit and its equipment, on off test circuit includes reversal connection detection module, over-pressed detection module and output control module；Reversal connection detection module, over-pressed detection module, output control module are sequentially connected；When reversal connection detection module detection power supply adaptor is accessed, judge whether input voltage is low level：It is then to judge power supply adaptor reversal connection, the input of interrupting input voltage；Otherwise input voltage is exported to over-pressed detection module；Whether over-pressed detection module judges input voltage more than setting voltage：It is then overvoltage, controlled output control module disconnects supply access, and stopping is powered to equipment；Otherwise controlled output control module conducting supply access, exports supply voltage and equipment is powered.So reversal connection and overvoltage when all stop power supply, only input voltage be normal value just power so that can avoid overvoltage with reversal connection when peril generation, raising safety in utilization, solution potential safety hazard.
Description
Technical field
The utility model is related to electronic technology field, more particularly to a kind of over-pressed and reverse-connection protection circuit and its equipment.
Background technology
With the development of society, nowadays various terminal equipment popularity rate more and more higher, species is also more and more, such as machine top
Box, OTT（Over The Top）Box, router, interchanger and all kinds of children's charging toys etc..So cause what is used to set
Standby specification is also more and more, becomes increasingly complex.Also, because the plug of equipment is extremely close, it is easy to wrong plug, anti-inserted etc. occur
Situation.The low-voltage equipment can be damaged when high-tension adapter is inserted in low-voltage equipment；When both positive and negative polarity is anti-inserted, this can be also damaged
Equipment.And if be inserted in equipment for a long time, then it is easy to the dangerous situations such as fire, electric shock.And it is common hundred that consumer is most
Surname, it is impossible to distinguish adapter also without related professional knowledge, more without the measuring instrument of specialty, causes, using dangerous, to deposit
In potential safety hazard.
Therefore, it is necessary to be improved to prior art.
Utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of overvoltage and reverse connecting protection
Circuit and its equipment, when appearance overvoltage and reversal connection are connected with power supply adaptor to solve existing equipment, easily have an accident, and make
With dangerous, there is a problem of potential safety hazard.
In order to achieve the above object, the utility model takes following technical scheme：
A kind of overvoltage and reverse-connection protection circuit, are arranged on the circuit board of equipment, and it includes reversal connection detection module, overvoltage inspection
Survey module and output control module；
When the reversal connection detection module detection power supply adaptor is accessed, judge whether input voltage is low level：It is to sentence
Power-off source adapter reversal connection, the input of interrupting input voltage；Otherwise input voltage is exported to over-pressed detection module；
Whether the over-pressed detection module judges input voltage more than setting voltage：It is then overvoltage, controlled output control mould
Block disconnects supply access, and stopping is powered to equipment；Otherwise controlled output control module conducting supply access, exports supply voltage pair
Equipment is powered.
In described overvoltage and reverse-connection protection circuit, the reversal connection detection module includes input interface, diode and energy storage
Electric capacity；
The VIN pin of the input interface connect the positive pole of diode, the positive pole of the negative pole connection storage capacitor of diode and
Over-pressed detection module, the GND pin and ground of the negative pole connection input interface of storage capacitor.
In described overvoltage and reverse-connection protection circuit, the over-pressed detection module includes triode, first resistor, the second electricity
Resistance and 3rd resistor；
One end of the first resistor connects positive pole, the emitter stage and output control module of triode of storage capacitor；The
One end of the other end connection second resistance of one resistance and the base stage of triode, the one of the colelctor electrode connection 3rd resistor of triode
End and output control module, the other end and ground of the other end connection 3rd resistor of second resistance.
In described overvoltage and reverse-connection protection circuit, the output control module includes the first electric capacity, the second electric capacity, MOS
Pipe and the 4th resistance；
The source electrode of the metal-oxide-semiconductor connects the emitter stage of one end, one end of the first electric capacity and triode of the 4th resistance, MOS
The grid of pipe connects the colelctor electrode of the other end, the other end of the first electric capacity and triode of the 4th resistance, the drain electrode connection of metal-oxide-semiconductor
One end of second electric capacity and feeder ear, the other end ground connection of the second electric capacity.
In described overvoltage and reverse-connection protection circuit, the triode is PNP triode, and metal-oxide-semiconductor is PMOS.
In described overvoltage and reverse-connection protection circuit, the output control module also includes the 3rd electric capacity and the 4th electric capacity；
One end of 3rd electric capacity connects one end, one end of the 4th electric capacity and the feeder ear of the second electric capacity, the 3rd electric capacity
The other end connect the 4th electric capacity the other end and ground.
A kind of overvoltage and reverse connecting protection equipment, including a circuit board, wherein, described overvoltage is provided with the circuit board
And reverse-connection protection circuit, overvoltage and reverse-connection protection circuit are connected with power supply adaptor；
It is described overvoltage and reverse-connection protection circuit whether power supply adaptor is judged by reversal connection according to input voltage, be interrupt it is defeated
Enter the input of voltage；Whether overvoltage is otherwise judged whether more than setting voltage according to input voltage：More than then overvoltage, it is right to stop
Equipment is powered；Otherwise output supply voltage is powered to equipment.
Compared to prior art, overvoltage and reverse-connection protection circuit and its equipment that the utility model is provided, reversal connection detection mould
When block detection power supply adaptor is accessed, judge whether input voltage is low level：It is then to judge power supply adaptor reversal connection, interrupts defeated
Enter the input of voltage；Otherwise input voltage is exported to over-pressed detection module；Over-pressed detection module judges whether input voltage is big
In setting voltage：It is then overvoltage, controlled output control module disconnects supply access, and stopping is powered to equipment；Otherwise controlled output
Control module turns on supply access, and output supply voltage is powered to equipment.So all stopped power supply in reversal connection and overvoltage, only
Input voltage is just powered for normal value, so as to the generation of peril when overvoltage and reversal connection can be avoided, improves safety in utilization, solution
Certainly potential safety hazard.
Brief description of the drawings
The structured flowchart of the over-pressed and reverse connecting protection equipment that Fig. 1 is provided for the utility model embodiment；
The circuit diagram of the over-pressed and reverse-connection protection circuit that Fig. 2 is provided for the utility model embodiment.
Specific embodiment
The utility model provides a kind of overvoltage and reverse-connection protection circuit and its equipment, can realize in power supply adaptor and equipment
Both positive and negative polarity reversal connection when will not damage equipment, and the work(of the equipment will not be damaged when high-voltage adapter inserts low-voltage equipment
Energy；So as to avoid the generation of peril when overvoltage and reversal connection, safety in utilization is improved, solve potential safety hazard.To make this practicality
New purpose, technical scheme and effect are clearer, clear and definite, and the embodiment that develops simultaneously referring to the drawings enters one to the utility model
Step is described in detail.It should be appreciated that specific embodiment described herein is only used to explain the utility model, it is not used to limit this
Utility model.
Fig. 1 is referred to, one kind overvoltage and reverse connecting protection equipment that the utility model is provided are connected with power supply adaptor, wrap
The circuit board in the equipment of being arranged on is included, overvoltage and reverse-connection protection circuit 10 are provided with the circuit board.It is described over-pressed and anti-
Connect protection circuit 10 and judge that whether power supply adaptor, by reversal connection, is the defeated of then interrupting input voltage VIN according to input voltage VIN
Enter；Whether overvoltage is otherwise judged whether more than setting voltage according to input voltage VIN：More than then overvoltage, stop supplying equipment
Electricity；Otherwise output supply voltage VOUT powers to equipment.So all stopped power supply in overvoltage and reversal connection, only input voltage is
Normal value is just powered, so as to the generation of peril when overvoltage and reversal connection can be avoided, improves safety in utilization, solves safety hidden
Suffer from.
In the present embodiment, the overvoltage and reverse-connection protection circuit 10 include reversal connection detection module 110, over-pressed detection module
120 and output control module 130；The reversal connection detection module 110, over-pressed detection module 120, output control module 130 are successively
Connection, the output control module 130 connects the feeder ear VCC of equipment.The reversal connection detection module 110 detects power supply adaptor
During access, judge whether input voltage VIN is low level（Usually 0V）：It is then to judge power supply adaptor reversal connection, interrupting input
The input of voltage VIN；Otherwise input voltage VIN is exported to over-pressed detection module 120.The over-pressed detection module 120 judges
Whether input voltage VIN is more than setting voltage：It is then overvoltage, controlled output control module 130 disconnects supply access, and stopping pair setting
Available electricity；Otherwise voltage is normal, and the conducting supply access of controlled output control module 130, output supply voltage VOUT is supplied equipment
Electricity.
Also referring to Fig. 2, the reversal connection detection module 110 includes input interface J1, diode D1 and storage capacitor
CE1；The positive pole of the VIN pin connection diode D1 of the input interface J1, the negative pole connection storage capacitor CE1 of diode D1 is just
Pole and over-pressed detection module 120, the GND pin and ground of the negative pole connection input interface J1 of storage capacitor CE1.
It is to be appreciated that the ac plug of power supply adaptor generally connects civil power, DC plug（Output end）Connection phase
The input interface J1 of the equipment answered.When DC plug is accessed, some DC plugs are interior just outer negative, and some DC plugs are interior negative
Outward just.When interior just outer negative DC plug is inserted in input interface J1, the VIN pin of input interface J1 are positive pole input positive voltages,
GND pin just connect for 0V, i.e. power supply adaptor, and the corresponding input current of input voltage VIN smoothly flows into overvoltage by diode D1
Detection module 120.
When interior negative outer positive DC plug is inserted, the VIN pin of input interface J1 are negative poles（Ground equivalent to equipment is arrived
The positive pole of power supply adaptor）, GND pin input positive voltage, then power supply adaptor reversal connection.Due to the unilateral conduction of diode D1
Feature, can now allow the both positive and negative polarity of power supply adaptor to form loop, and input voltage VIN cannot be exported by diode D1,
Would not be connected with the feeder ear VCC of equipment, so equipment is unaffected and damages, so as to reach the mesh of reverse connecting protection
's.
The over-pressed detection module 120 includes triode Q1, first resistor R1, second resistance R2 and 3rd resistor R3；Institute
The one end for stating first resistor R1 connects positive pole, the emitter stage of triode Q1 and the output control module 130 of storage capacitor CE1；The
One end of the other end connection second resistance R2 of one resistance R1 and the base stage of triode Q1, the colelctor electrode connection the 3rd of triode Q1
One end of resistance R3 and output control module 130, the other end and ground of the other end connection 3rd resistor R3 of second resistance R2.
The output control module 130 includes the first electric capacity C1, the second electric capacity C2, metal-oxide-semiconductor Q2 and the 4th resistance R4；It is described
The source electrode of metal-oxide-semiconductor Q2 connects the emitter stage of one end, one end of the first electric capacity C1 and triode Q1 of the 4th resistance R4, metal-oxide-semiconductor Q2
Grid connect the 4th resistance R4 the other end, the other end of the first electric capacity C1 and triode Q1 colelctor electrode, the leakage of metal-oxide-semiconductor Q2
Pole connects one end of the second electric capacity C2 and the other end ground connection of feeder ear VCC, the second electric capacity C2.
Wherein, triode Q1 is PNP triode, and metal-oxide-semiconductor Q2 is PMOS.First resistor R1 and second resistance R2 constitutes partial pressure
Circuit, by the size for setting the resistance of the two resistance to set overvoltage protection value, i.e. setting voltage.3rd resistor R3 and
Four resistance R4 form the UGS partial pressures of metal-oxide-semiconductor Q2 to control the keying of metal-oxide-semiconductor Q2.First electric capacity C1 and the second electric capacity C2 are filter
Ripple electric capacity.
When input voltage VIN is higher than setting voltage, being acted on by the partial pressure of first resistor R1 and second resistance R2 can handle
Triode Q1 opens cut-off, and then the pole tension UGS of GS two of metal-oxide-semiconductor Q2 can be less than the cut-in voltage of metal-oxide-semiconductor Q2, and metal-oxide-semiconductor Q2 breaks
Open cut-off, the feeder ear VCC disconnections of input voltage VIN and equipment, so as to play the purpose of protection equipment during high pressure.Such as when electricity high
The power supply adaptor of pressure is not just powered when being inserted in low-voltage equipment, would not damage the low-voltage equipment.
When input voltage VIN is less than or equal to setting voltage value, triode Q1 conductings, unlatchings of the UGS more than metal-oxide-semiconductor Q2
Voltage, metal-oxide-semiconductor Q2 conductings, supply voltage VOUT is exported to feeder ear VCC, and equipment can obtain electric normal work.
In the specific implementation, the capacitance of storage capacitor CE1 is larger, except that can filter when input voltage VIN is input into, moreover it is possible to deposit
Storing up electricity energy.So in the booting moment of equipment, the source electrode of metal-oxide-semiconductor Q2（S poles）When having voltage overshoot, the presence of storage capacitor CE1
The slow effect for opening can be played, so as to play the purpose of anti-overshoot.
In order that power supply is more stablized, in further embodiment, the output control module 130 also includes that filtering is anti-interference
The 3rd electric capacity C3 and the 4th electric capacity C4；One end of the 3rd electric capacity C3 connects one end, the 4th electric capacity C4 of the second electric capacity C2
One end and feeder ear VCC, the 3rd electric capacity C3 the other end connect the 4th electric capacity C4 the other end and ground.
In sum, the overvoltage and reverse-connection protection circuit energy protection equipment that the utility model is provided are without damage：Each family
Front yard power supply is more, power supply unrest and supply voltage are inconsistent, even if at will inserting, even if high voltage power supply is persistently inserted on low-voltage equipment, or
Person's power supply continues anti-inserted, equipment heating and burning is will not result in, so that personal safety will not occur and property loss plays guarantor
Shield is acted on.
Compared with prior art, existing equipment designs corresponding protection circuit using integrated IC, but integrated IC is designed
Cost it is too high, it is impossible to popularization use.Some use controllable silicon designs, but its high cost, volume are big；And being used controllable silicon more
In the equipment of high pressure and high power consumption, what family commonly used is low-voltage direct low power consuming devices, is not suitable for using controllable silicon electricity
Road.And the application using the unilateral conduction of diode realize power supply can only one direction circulate, so as to realize that anti-reverse power connection is led
The device damage of cause；The anti-of high input voltage can be achieved with by the switching characteristic of the partial pressure of general resistance, triode and metal-oxide-semiconductor
Shield；Its circuit structure is very simple, very low without using IC, sheet, highly reliable；
It is understood that for those of ordinary skills, can according to the technical solution of the utility model and
The design of its utility model is subject to equivalent or change, and all these changes or replacement should all belong to appended by the utility model
Scope of the claims.
Claims (7)
1. a kind of overvoltage and reverse-connection protection circuit, are arranged on the circuit board of equipment, it is characterised in that detect mould including reversal connection
Block, over-pressed detection module and output control module；
When the reversal connection detection module detection power supply adaptor is accessed, judge whether input voltage is low level：It is then to judge electricity
Source adapter reversal connection, the input of interrupting input voltage；Otherwise input voltage is exported to over-pressed detection module；
Whether the over-pressed detection module judges input voltage more than setting voltage：It is then overvoltage, controlled output control module is broken
Supply access is opened, stopping is powered to equipment；Otherwise controlled output control module conducting supply access, exports supply voltage to equipment
Power supply.
2. it is according to claim 1 overvoltage and reverse-connection protection circuit, it is characterised in that the reversal connection detection module include it is defeated
Incoming interface, diode and storage capacitor；
The VIN pin of the input interface connect the positive pole of diode, the positive pole of the negative pole connection storage capacitor of diode and overvoltage
Detection module, the GND pin and ground of the negative pole connection input interface of storage capacitor.
3. it is according to claim 2 overvoltage and reverse-connection protection circuit, it is characterised in that the over-pressed detection module include three
Pole pipe, first resistor, second resistance and 3rd resistor；
One end of the first resistor connects positive pole, the emitter stage and output control module of triode of storage capacitor；First electricity
Resistance the other end connection second resistance one end and triode base stage, triode colelctor electrode connection 3rd resistor one end and
Output control module, the other end and ground of the other end connection 3rd resistor of second resistance.
4. overvoltage according to claim 3 and reverse-connection protection circuit, it is characterised in that the output control module includes the
One electric capacity, the second electric capacity, metal-oxide-semiconductor and the 4th resistance；
The source electrode of the metal-oxide-semiconductor connects the emitter stage of one end, one end of the first electric capacity and triode of the 4th resistance, metal-oxide-semiconductor
Grid connects the colelctor electrode of the other end, the other end of the first electric capacity and triode of the 4th resistance, the drain electrode connection second of metal-oxide-semiconductor
One end of electric capacity and feeder ear, the other end ground connection of the second electric capacity.
5. it is according to claim 4 overvoltage and reverse-connection protection circuit, it is characterised in that the triode be PNP triode,
Metal-oxide-semiconductor is PMOS.
6. it is according to claim 4 overvoltage and reverse-connection protection circuit, it is characterised in that the output control module also includes
3rd electric capacity and the 4th electric capacity；
One end of 3rd electric capacity connects one end, one end of the 4th electric capacity and the feeder ear of the second electric capacity, the 3rd electric capacity it is another
One end connects the other end and ground of the 4th electric capacity.
7. a kind of over-pressed and reverse connecting protection equipment, an including circuit board, it is characterised in that set just like right on the circuit board
It is required that any described overvoltages of 1-6 and reverse-connection protection circuit, overvoltage and reverse-connection protection circuit are connected with power supply adaptor；
Whether the overvoltage and reverse-connection protection circuit judge power supply adaptor by reversal connection according to input voltage, are that then interrupting input is electric
The input of pressure；Whether overvoltage is otherwise judged whether more than setting voltage according to input voltage：More than then overvoltage, stop to equipment
Power supply；Otherwise output supply voltage is powered to equipment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621237743.1U CN206272219U (en) | 2016-11-18 | 2016-11-18 | A kind of overvoltage and reverse-connection protection circuit and its equipment |
| PCT/CN2017/111053 WO2018090924A1 (en) | 2016-11-18 | 2017-11-15 | Over-voltage and reverse connection protection circuit and device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621237743.1U CN206272219U (en) | 2016-11-18 | 2016-11-18 | A kind of overvoltage and reverse-connection protection circuit and its equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206272219U true CN206272219U (en) | 2017-06-20 |
Family
ID=59039976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621237743.1U Active CN206272219U (en) | 2016-11-18 | 2016-11-18 | A kind of overvoltage and reverse-connection protection circuit and its equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN206272219U (en) |
| WO (1) | WO2018090924A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769186A (en) * | 2017-11-29 | 2018-03-06 | 深圳微步信息股份有限公司 | A kind of protection circuit of direct current supply |
| WO2018090924A1 (en) * | 2016-11-18 | 2018-05-24 | 深圳创维数字技术有限公司 | Over-voltage and reverse connection protection circuit and device thereof |
| CN110602541A (en) * | 2018-06-12 | 2019-12-20 | 瑞昱半导体股份有限公司 | Media streaming device and protection method thereof |
| US12046932B2 (en) | 2019-01-31 | 2024-07-23 | Vivo Mobile Communication Co., Ltd. | Charging circuit and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108615334A (en) * | 2018-05-31 | 2018-10-02 | 国网宁夏电力有限公司中卫供电公司 | A kind of nearly electric induction groupcall prior-warning device |
| CN109524944B (en) * | 2018-12-26 | 2024-05-03 | 上海洞彻智能科技有限公司 | Protection circuit of direct current fan driver |
| CN116799920B (en) * | 2023-07-03 | 2024-01-02 | 湖南炬神电子有限公司 | Direct current charging protection circuit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102035169B (en) * | 2009-09-28 | 2015-05-20 | 研祥智能科技股份有限公司 | Input overvoltage protection circuit and DC-DC power supply conversion device |
| CN202066965U (en) * | 2011-04-15 | 2011-12-07 | 江苏吉美思物联网产业股份有限公司 | GPS (global positioning system) device with over-voltage protection function |
| CN102882181B (en) * | 2012-09-29 | 2015-02-25 | 深圳市新国都技术股份有限公司 | Reverse protection and overvoltage protection circuit based on bidirectional silicon-controlled thyristor |
| CN204271621U (en) * | 2014-12-11 | 2015-04-15 | 李慧章 | A kind of reversal connection of battery recharger port and short-circuit protection |
| CN205039517U (en) * | 2015-08-27 | 2016-02-17 | 南京亚士德科技有限公司 | Overvoltage protection circuit |
| CN206272219U (en) * | 2016-11-18 | 2017-06-20 | 深圳创维数字技术有限公司 | A kind of overvoltage and reverse-connection protection circuit and its equipment |
-
2016
- 2016-11-18 CN CN201621237743.1U patent/CN206272219U/en active Active
-
2017
- 2017-11-15 WO PCT/CN2017/111053 patent/WO2018090924A1/en active Application Filing
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018090924A1 (en) * | 2016-11-18 | 2018-05-24 | 深圳创维数字技术有限公司 | Over-voltage and reverse connection protection circuit and device thereof |
| CN107769186A (en) * | 2017-11-29 | 2018-03-06 | 深圳微步信息股份有限公司 | A kind of protection circuit of direct current supply |
| CN110602541A (en) * | 2018-06-12 | 2019-12-20 | 瑞昱半导体股份有限公司 | Media streaming device and protection method thereof |
| CN110602541B (en) * | 2018-06-12 | 2021-08-20 | 瑞昱半导体股份有限公司 | Media streaming device and protection method thereof |
| US12046932B2 (en) | 2019-01-31 | 2024-07-23 | Vivo Mobile Communication Co., Ltd. | Charging circuit and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018090924A1 (en) | 2018-05-24 |
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