CN205986096U - Voltage protection circuit - Google Patents
Voltage protection circuit Download PDFInfo
- Publication number
- CN205986096U CN205986096U CN201620459117.0U CN201620459117U CN205986096U CN 205986096 U CN205986096 U CN 205986096U CN 201620459117 U CN201620459117 U CN 201620459117U CN 205986096 U CN205986096 U CN 205986096U
- Authority
- CN
- China
- Prior art keywords
- voltage
- output
- audion
- output unit
- vehicle power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 230000006378 damage Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model is suitable for a circuit protection provides a voltage protection circuit, including protected location and output unit, the protected location is connected with the vehicle mounted power and output unit respectively for the vehicle mounted power's voltage just often, output switches on signal to output unit, when voltage abnormity appears in detection the vehicle mounted power, output guard signal to output unit, output unit is connected with the vehicle mounted power and vehicle load respectively for receiving when switching on the signal, output operating voltage to vehicle load still is used for after receiving guard signal, closes operating voltage output. The utility model discloses the protected location has been added, including overvoltage protection unit and undervoltage protection unit, can detecting the vehicle mounted power's the excessive pressure and the under -voltage condition respectively, output guard signal is used for controlling output unit closes output, has avoided production and after -sales service in -process because of the power input abnormally leads to the damage to the product, reduces the destruction cost of product, improves reliability of an item.
Description
Technical field
This utility model belongs to circuit design field, more particularly, to a kind of voltage protection circuit.
Background technology
The power supply of BMS (BATTERY MANAGEMENT SYSTEM, power-supply management system) at present
Design is all to set working range according to the power supply size of power supply, and the size of vehicle power is fixing, institute
When being designed with BMS, simply the working range of design vehicle power is without carrying out voltage protection design, right mostly
Input voltage requires controllability not high, but test power input is unfixed in process of production, therefore
Product can be led to occur because of voltage instability damaging.Meanwhile, there is no electric voltage exception in available circuit design
Defencive function, easily causes damage of product during production and after-sales service because of maloperation.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of voltage protection circuit it is intended to solve existing
Have in circuit design and there is no electric voltage exception defencive function, easily because of maloperation during production and after-sales service
And cause the problem of damage of product.
This utility model is achieved in that a kind of voltage protection circuit, including protection location and output unit；
Described protection location, is connected with vehicle power and described output unit respectively, for described vehicle-mounted
When the voltage of power supply is normal, output Continuity signal is to described output unit；Detecting described vehicle power appearance
During electric voltage exception, output protection signal to described output unit；
Described output unit, is connected with vehicle power and vehicle load respectively, for leading described in receive
During messenger, output services voltage to described vehicle load, it is additionally operable to after receiving described protection signal,
Close running voltage output.
Further, described protection location includes：
Overvoltage protecting unit, is connected with vehicle power and described output unit respectively, for described vehicle-mounted
When the voltage of power supply is normal, output Continuity signal is to described output unit；Detecting described vehicle power appearance
When over-pressed, output over-voltage protection signal to described output unit；
Under-voltage protection unit, is connected with vehicle power and described Overvoltage protecting unit, respectively for described
When the voltage of vehicle power is normal, output Continuity signal is to described output unit；Detecting described vehicle power
When under-voltage, output UVP signal is to described output unit；
Described output unit, is connected with vehicle power and vehicle load respectively, for leading described in receive
During messenger, output services voltage to described vehicle load, it is additionally operable to receiving described overvoltage protection signal
Or after UVP signal, close running voltage output.
Further, described Overvoltage protecting unit includes the first Zener diode, first resistor, second resistance
With the first audion；
The negative pole of described first Zener diode connects the positive pole of described vehicle power, described first voltage stabilizing two pole
The positive pole of pipe connects the ground level of described first audion by described first resistor；The first of described second resistance
End connects the ground level of described first audion, and the second end of described second resistance connects the negative of described vehicle power
Pole；The emitting stage of described first audion connects described output unit, and the colelctor electrode of described first audion is even
Connect described under-voltage protection unit.
Further, the resistance of described first resistor is 100K Ω, and the resistance of described second resistance is 47K Ω.
Further, described first audion is PNP transistor.
Further, described under-voltage protection unit includes the second Zener diode, 3rd resistor, the 4th resistance
With the second audion；
The negative pole of described second Zener diode connects the positive pole of described vehicle power, described second voltage stabilizing two pole
The positive pole of pipe connects the ground level of described second audion by described 3rd resistor；The first of described 4th resistance
End connects the ground level of described second audion, and the second end of described 4th resistance connects the negative of described vehicle power
Pole；The colelctor electrode of described second audion connects the colelctor electrode of described first audion, described second audion
Emitter stage connect described vehicle power negative pole.
Further, the resistance of described 3rd resistor is 100K Ω, and the resistance of described 4th resistance is 47K Ω.
Further, described second audion is NPN transistor.
This utility model compared with prior art, has the beneficial effects that：This utility model adds protection location,
Can be when the vehicle carried power voltage of input be normal, output Continuity signal is in order to control output unit normally to export
Voltage, when the electric voltage exception of described vehicle power is detected, output protection signal is in order to control described output
Unit closes output.
Brief description
Fig. 1 is a kind of structural representation of voltage protection circuit that this utility model embodiment one provides.
Fig. 2 is a kind of structural representation of voltage protection circuit that this utility model embodiment two provides.
Fig. 3 is a kind of detailed construction schematic diagram of voltage protection circuit that this utility model embodiment two provides
Specific embodiment
In order that the purpose of this utility model, technical scheme and advantage become more apparent, below in conjunction with accompanying drawing
And embodiment, this utility model is further elaborated.It should be appreciated that it is described herein concrete
Embodiment only in order to explain this utility model, is not used to limit this utility model.
Fig. 1 shows a kind of first embodiment of voltage protection circuit that this utility model provides, a kind of voltage
Protection circuit, including protection location 1 and output unit 2；
Protection location 1, is connected with vehicle power and output unit 2 respectively, in described vehicle power
When voltage is normal, output Continuity signal is to output unit 2；When detecting that electric voltage exception in described vehicle power,
Output protection signal is to output unit 2；
Output unit 2, is connected with vehicle power and vehicle load 3 respectively, for receiving described conducting
During signal, output services voltage to described vehicle load 3, it is additionally operable to, after receiving described protection signal, close
Close running voltage output.
In the present embodiment, the voltage of the vehicle power to input for the protection location 1 detects, is detecting
Magnitude of voltage in normal range of operation, output Continuity signal to output unit 2, output unit 2 is receiving
After described Continuity signal, output services voltage to vehicle load 3 is so that vehicle load 3 normal work.And work as
When protection location 1 detects the magnitude of voltage exception of vehicle power, by output protection signal to output unit 2, defeated
Go out unit and receiving described protection signal and be shut off the output of running voltage, ensure that vehicle load will not with this
Damage because of electric voltage exception.
Further, in vehicle power, the protection of realizing circuit under under-voltage or overpressure situation can occur, this
Utility model additionally provides second embodiment as shown in Figure 2, and protection location 1 includes：
Overvoltage protecting unit 11, is connected with vehicle power and output unit 2 respectively, for described vehicle-mounted
When the voltage of power supply is normal, output Continuity signal is to output unit 2；Over-pressed detecting that described vehicle power occurs
When, output over-voltage protection signal is to output unit 2；
Under-voltage protection unit 12, is connected with vehicle power and Overvoltage protecting unit 11, respectively for described
When the voltage of vehicle power is normal, output Continuity signal is to output unit 2；Detecting described vehicle power appearance
When under-voltage, output UVP signal is to output unit 2；
Output unit 2, is connected with vehicle power and vehicle load 3 respectively, for receiving described conducting
During signal, output services voltage, to vehicle load 3, is additionally operable to receiving described overvoltage protection signal or under-voltage
After protection signal, close running voltage output.
In the present embodiment, Overvoltage protecting unit 11 and under-voltage protection unit 12 detect vehicle power respectively
Voltage condition, in the case that appearance is over-pressed or under-voltage, can control rapidly the work electricity of output unit 2
Pressure output is it is ensured that the safety of vehicle load.
Below, this utility model is further explained in conjunction with Fig. 3：
Overvoltage protecting unit 11 include the first Zener diode D1, first resistor R1, second resistance R2 and
First audion Q1；The negative pole of the first Zener diode D1 connects the positive pole of described vehicle power, and first is steady
The positive pole of pressure diode D1 connects the ground level of the first audion Q1 by first resistor R1；Second resistance R2
First end connect the first audion Q1 ground level, second resistance R2 second end connect described vehicle power
Negative pole；The emitting stage of the first audion Q1 connects output unit 2, and the colelctor electrode of the first audion Q1 is even
Connect under-voltage protection unit 12.The resistance of first resistor R1 is 100K Ω, and the resistance of second resistance R2 is 47K
Ω, the first audion Q1 are PNP transistor.In the present embodiment, the model of the first audion Q1
MMBT3906.
Under-voltage protection unit 12 include the second Zener diode D2,3rd resistor R3, the 4th resistance R4 and
Second audion Q2；The negative pole of the second Zener diode D2 connects the positive pole of described vehicle power, and second is steady
The positive pole of pressure diode D2 connects the ground level of the second audion Q2 by 3rd resistor R3；4th resistance R4
First end connect the second audion Q2 ground level, the 4th resistance R4 second end connect described vehicle power
Negative pole；The colelctor electrode of the second audion Q2 connects the colelctor electrode of the first audion Q1, the second audion Q2
Emitter stage connect described vehicle power negative pole.The resistance of 3rd resistor R3 is 100K Ω, the 4th resistance
The resistance of R4 is 47K Ω, and the second audion Q2 is NPN transistor.In the present embodiment, the two or three pole
Model MMBT5551 of pipe Q2.
In Fig. 3, VIN connects the positive pole of vehicle power, and GND connects the negative pole of vehicle power, and LOAD is vehicle
Load.VIN connects the positive pole of vehicle power, and 1 foot of the chip U1 being adopted by output unit 2 is powered, the
The voltage stabilizing value of one Zener diode D1 and the second Zener diode D2 is configured according to applied environment, at this
In embodiment, the first Zener diode D1 carries out overvoltage protection, and the second Zener diode D2 carries out under-voltage guarantor
Shield.Vehicle power, after D2 (D1), controls NPN pipe Q2 and PNP by R3/R4 (R1/R2) partial pressure
The conducting of pipe Q1, by the conducting state of Q1 and Q2 come 5 feet of control chip U1 thus controlling power supply
Output.During normal work, the ground level (Q2_b) of Q2 is high level, and the ground level (Q1_b) of Q1 is low level,
Q1, Q2 are both turned on, and 5 feet of U1 are low level, and U1 normally exports.When the voltage of vehicle power is less than
During the protection value that D2 sets, Q2_b is changed into low level, and Q2 ends, and now 5 feet of U1 are equal to VIN,
It is changed into high level, U1 no exports, carry out under-voltage protection.When voltage is higher than the value that D1 sets, Q1_b becomes
For high level, Q1 cut-off, 5 feet of U1 are changed into high level in the same manner, and U1 no exports, and now carry out overvoltage guarantor
Shield.
This utility model realizes the control to power supply chip for the audion by two Zener diodes, thus real
The now voltage protection to product, in this utility model, voltage protection value can freely arrange (electricity according to applied environment
Pressure protection value adjusts by changing stabilivolt D1, the value of stabilivolt D2 is realized, and just selects different stabilivolts
The voltage protection of different range can be realized).This utility model can carry out overvoltage according to control source size
With under-voltage protection it is ensured that the normal operation of product, it is to avoid maloperation and the loss that brings, improve product
Reliability.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model,
All any modification, equivalent and improvement made within spirit of the present utility model and principle etc., all should
It is included within protection domain of the present utility model.
Claims (8)
1. a kind of voltage protection circuit is it is characterised in that described voltage protection circuit includes protection location and defeated
Go out unit；
Described protection location, is connected with vehicle power and described output unit respectively, for described vehicle-mounted
When the voltage of power supply is normal, output Continuity signal is to described output unit；Detecting described vehicle power appearance
During electric voltage exception, output protection signal to described output unit；
Described output unit, is connected with vehicle power and vehicle load respectively, for leading described in receive
During messenger, output services voltage to described vehicle load, it is additionally operable to after receiving described protection signal,
Close running voltage output.
2. voltage protection circuit according to claim 1 is it is characterised in that described protection location includes：
Overvoltage protecting unit, is connected with vehicle power and described output unit respectively, for described vehicle-mounted
When the voltage of power supply is normal, output Continuity signal is to described output unit；Detecting described vehicle power appearance
When over-pressed, output over-voltage protection signal to described output unit；
Under-voltage protection unit, is connected with vehicle power and described Overvoltage protecting unit, respectively for described
When the voltage of vehicle power is normal, output Continuity signal is to described output unit；Detecting described vehicle power
When under-voltage, output UVP signal is to described output unit；
Described output unit, is connected with vehicle power and vehicle load respectively, for leading described in receive
During messenger, output services voltage to described vehicle load, it is additionally operable to receiving described overvoltage protection signal
Or after UVP signal, close running voltage output.
3. voltage protection circuit according to claim 2 is it is characterised in that described Overvoltage protecting unit
Including the first Zener diode, first resistor, second resistance and the first audion；
The negative pole of described first Zener diode connects the positive pole of described vehicle power, described first voltage stabilizing two pole
The positive pole of pipe connects the ground level of described first audion by described first resistor；The first of described second resistance
End connects the ground level of described first audion, and the second end of described second resistance connects the negative of described vehicle power
Pole；The emitting stage of described first audion connects described output unit, and the colelctor electrode of described first audion is even
Connect described under-voltage protection unit.
4. voltage protection circuit according to claim 3 is it is characterised in that the resistance of described first resistor
It is worth for 100K Ω, the resistance of described second resistance is 47K Ω.
5. voltage protection circuit according to claim 3 is it is characterised in that described first audion is
PNP transistor.
6. voltage protection circuit according to claim 3 is it is characterised in that described under-voltage protection unit
Including the second Zener diode, 3rd resistor, the 4th resistance and the second audion；
The negative pole of described second Zener diode connects the positive pole of described vehicle power, described second voltage stabilizing two pole
The positive pole of pipe connects the ground level of described second audion by described 3rd resistor；The first of described 4th resistance
End connects the ground level of described second audion, and the second end of described 4th resistance connects the negative of described vehicle power
Pole；The colelctor electrode of described second audion connects the colelctor electrode of described first audion, described second audion
Emitter stage connect described vehicle power negative pole.
7. voltage protection circuit according to claim 6 is it is characterised in that the resistance of described 3rd resistor
It is worth for 100K Ω, the resistance of described 4th resistance is 47K Ω.
8. voltage protection circuit according to claim 6 is it is characterised in that described second audion is
NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620459117.0U CN205986096U (en) | 2016-05-18 | 2016-05-18 | Voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620459117.0U CN205986096U (en) | 2016-05-18 | 2016-05-18 | Voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205986096U true CN205986096U (en) | 2017-02-22 |
Family
ID=58019576
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620459117.0U Active CN205986096U (en) | 2016-05-18 | 2016-05-18 | Voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205986096U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574274A (en) * | 2017-03-09 | 2018-09-25 | 惠州市新思为电子科技有限公司 | Applied to power protecting circuit in vehicle-carried tracking device |
| CN114284991A (en) * | 2021-12-29 | 2022-04-05 | 南京英锐创电子科技有限公司 | Overvoltage protection circuit and chip control circuit |
-
2016
- 2016-05-18 CN CN201620459117.0U patent/CN205986096U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108574274A (en) * | 2017-03-09 | 2018-09-25 | 惠州市新思为电子科技有限公司 | Applied to power protecting circuit in vehicle-carried tracking device |
| CN108574274B (en) * | 2017-03-09 | 2021-08-24 | 深圳市几米物联有限公司 | Power supply protection circuit applied to vehicle-mounted tracker |
| CN114284991A (en) * | 2021-12-29 | 2022-04-05 | 南京英锐创电子科技有限公司 | Overvoltage protection circuit and chip control circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102820638B (en) | Overcurrent protection device and electronic equipment | |
| CN109950881B (en) | Embedded equipment pre-detection protection circuit | |
| CN102938797B (en) | A kind of current detection controller of mobile terminal | |
| CN103779829A (en) | Load protection circuit | |
| CN104218558B (en) | Anti-surging high tension protection circuit | |
| CN105633905A (en) | Overvoltage and under-voltage protection circuit | |
| CN104682341A (en) | Over-voltage/low-voltage protective circuit | |
| CN205986096U (en) | Voltage protection circuit | |
| CN206211502U (en) | A kind of new locked protection circuit of positive feedback output overvoltage | |
| CN206211501U (en) | A kind of locked protection circuit of new output overvoltage | |
| CN205847076U (en) | AC D/C power | |
| CN207652028U (en) | A kind of switching power circuit and its protection circuit | |
| CN103326191B (en) | Socket safety protection device and safety protection socket | |
| CN202495738U (en) | Undervoltage protection circuit | |
| CN104577961B (en) | Over-pressed power-off protecting circuit | |
| CN106253375A (en) | A kind of electronic terminal charge protection circuit and electric terminal | |
| CN205355776U (en) | Short -circuit protection circuit based on power load is unusual | |
| CN105322499B (en) | A kind of short-circuit protection circuit abnormal based on power source loads | |
| CN205355790U (en) | Power protection circuit based on triode | |
| CN104701809B (en) | A kind of LED constant voltage source with self-locking protective circuit | |
| CN209200926U (en) | A kind of system of self-locking software controlling power circuit on-off | |
| CN103179458B (en) | A kind of Set Top Box and antenna supply module thereof | |
| CN206060710U (en) | And electromechanical source hot plug protection circuit and and electromechanical source | |
| CN107800111B (en) | A kind of automobile button circuit with short-circuit protection | |
| CN201860086U (en) | Medical power supply management circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20180428 Granted publication date: 20170222 |
|
| PP01 | Preservation of patent right | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20210428 Granted publication date: 20170222 |
|
| PD01 | Discharge of preservation of patent | ||
| PP01 | Preservation of patent right |
Effective date of registration: 20210428 Granted publication date: 20170222 |
|
| PP01 | Preservation of patent right | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20240428 Granted publication date: 20170222 |
|
| PD01 | Discharge of preservation of patent |