CN208782473U - A kind of surge protection circuit of vehicle power supply - Google Patents
A kind of surge protection circuit of vehicle power supply Download PDFInfo
- Publication number
- CN208782473U CN208782473U CN201821289645.1U CN201821289645U CN208782473U CN 208782473 U CN208782473 U CN 208782473U CN 201821289645 U CN201821289645 U CN 201821289645U CN 208782473 U CN208782473 U CN 208782473U
- Authority
- CN
- China
- Prior art keywords
- resistance
- diode
- triode
- power supply
- voltage
- 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
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model discloses a kind of surge protection circuits of vehicle power supply; the device includes switching circuit and rear class protection circuit; the switching circuit is set between the voltage input end and voltage output end; when the voltage of the voltage input end is more than preset threshold value; the switching circuit disconnects; when the voltage of the voltage input end is lower than preset threshold value, the switching circuit is connected；The rear class protection circuit includes triode Q1, resistance R1, resistance R2 and diode D1; the one end the resistance R1 is connected with the voltage input end; it is grounded after other end series resistance R2; the base stage of the triode Q1 is connected between the resistance R1 and resistance R2; the collector of the triode Q1 is connected by the diode D1 with the input terminal of the regulated power supply, and the output end of the regulated power supply connects a control of product chip.Surge protection circuit provided by the utility model, can effectively while protection circuit in precision electronic element and control circuit product chips.
Description
Technical field
The utility model relates to electronic technology fields, and in particular to a kind of surge protection circuit of vehicle power supply.
Background technique
At present in many Automobile Electronic Industries, in order to which high-effect protection power source system is not damaged, transient voltage inhibits two
Pole pipe abbreviation TVS pipe (Transient Voltage Suppressor) is best selection, when the two poles of the earth of TVS diode are by reversed transient state high-energy
When impact, the high impedance of its two interpolar can be become Low ESR, be absorbed and be up to thousands of watts by it with the speed of 10-12 second-time
Surge power makes the voltage clamping of two interpolars in a predetermined value, the precision components being effectively protected in electronic circuit, from
The damage of various surge pulses.
But TVS pipe cost is excessively high and technical limiting also has many shortcomings: TVS pipe institute receptible wink
State pulse is unduplicated, but pulse recurrence frequency as defined in device (the ratio between duration and intermittent time) is 0.01%, such as
In fruit circuit when the pulse of duplicating property, TVS pipe can be damaged, it can be seen that TVS pipe cannot receive long period pulsewidth surge, institute
It can't be stablized in vehicle electric field with TVS pipe, there is also very big hidden danger.
And existing vehicle power supply surge protection circuit often only protects the precision components in circuit in the prior art,
Not to the protection of control of product chip, control of product chip plays the role of the entire circuit of control and power supply, once product control
Wafer damage processed also will affect the work of circuit.
Utility model content
In view of the deficiencies in the prior art, the purpose of this utility model is to provide a kind of surge of vehicle power supply guarantors
Protection circuit, can effectively while protection circuit in precision electronic element and control circuit control of product chip, improve produce
The safety of product and the reliability used.
To achieve the above objectives, the technical scheme adopted by the utility model is that:
One voltage input end, voltage output end and regulated power supply；
One switching circuit, the switching circuit are set between the voltage input end and voltage output end, and in the electricity
When the voltage of input terminal being pressed to be more than preset threshold value, the switching circuit is disconnected, and is lower than in the voltage of the voltage input end pre-
If threshold value when, the switching circuit is connected；
One rear class protects circuit, and rear class protection circuit includes triode Q1, resistance R1, resistance R2 and diode D1,
The one end the resistance R1 is connected with the voltage input end, is grounded after other end series resistance R2, the base stage of the triode Q1
It is connected between the resistance R1 and resistance R2, the emitter ground connection of the triode Q1, the collector of the triode Q1 is logical
It crosses the diode D1 to be connected with the input terminal of the regulated power supply, the output end of the regulated power supply connects a control of product core
Piece.
Based on the above technical solution, the switching circuit include field-effect tube Q2, triode Q3, triode Q4,
Triode Q5 and resistance R3, resistance R4, resistance R6, the source electrode of the field-effect tube Q2 is connected with the voltage input end, described
It is connected after the gate series resistance R3 of field-effect tube Q2 with the collector of the triode Q3, and the grid of the field-effect tube Q2
It is connected after series resistance R6 with the voltage input end, the drain electrode of the field-effect tube Q2 is connected with the voltage output end, institute
The base stage for stating triode Q3 is connected with the collector of the collector of the triode Q4 and triode Q5, the triode Q4's
Base stage is connected by resistance R4 with the voltage input end, the emitter and three of the emitter of the triode Q3, triode Q4
The emitter of pole pipe Q5 is grounded.
Based on the above technical solution, an arc suppression is additionally provided between the voltage input end and switching circuit
Circuit, the arc suppressing circuit include power inductance L1, diode D2 and diode D7, the diode D2 and power inductance
It connects after L1 is in parallel with the diode D7, the anode of the diode D2 is connected with the switching circuit, the diode D2
Cathode be connected with the cathode of the diode D7, the diode D7 anode be connected with the voltage input end.
Based on the above technical solution, the switching circuit further includes diode D3, the anode of the diode D3
It is respectively connected with electricity yin R4 and electricity yin R5, the other end ground connection of the electricity yin R5, the cathode and the voltage of the diode D3
Output end is connected.
Based on the above technical solution, the switching circuit further includes diode D4, the diode D4 and resistance
R6 is in parallel.
Based on the above technical solution, the diode D1, diode D3 and diode D4 are zener diode.
Based on the above technical solution, the field-effect tube Q2 is PMOS tube.
Based on the above technical solution, the rear class protection circuit further includes diode D5, the diode D5's
It is positive to be connected with the voltage input end, the input terminal of the cathode of the diode D5 and the resistance R1 and the regulated power supply
It is connected.
Based on the above technical solution, the voltage input end is in series with resistance R7 and resistance R8, the resistance R7
One end is connected with the voltage input end, is grounded after the other end series connection resistance R8, the base stage of the triode Q5 is connected to
Between the resistance R7 and resistance R8.
Based on the above technical solution, the switching circuit further includes a Switching Power Supply and resistance R9, the switch
Power supply, which is connected, to be connected after the resistance R9 with the collector of the base stage of the triode Q3, the triode Q4.
Compared with the prior art, the advantages of the utility model are:
(1) surge protection circuit of vehicle power supply provided by the utility model includes that a rear class protects circuit, rear class protection
It include triode Q1 and zener diode D1 in circuit, when voltage input end B+ surge input voltage value occurs more than predetermined threshold
Value, triode Q1 conducting, releases to carry out electric current, and zener diode D1 is worked at the same time, it can be measured with 10 minus 12 power second
The high impedance of its two interpolar is become Low ESR, absorbs up to thousands of watts of surge power, make the voltage of two interpolars by the speed of grade
It clamps in a predetermined value, protects regulated power supply without damage, guarantee that regulated power supply can be mentioned persistently to rear class control of product chip
For stable voltage, the damage of surge pulse is protected it from, to play a very good protection to entire circuit.
(2) surge protection circuit of vehicle power supply provided by the utility model includes switching circuit, and switching circuit includes three
Pole pipe Q4 and zener diode D3, when voltage input end B+ surge input voltage value occurs more than predetermined threshold, triode Q5 is led
The logical electric current that carries out is released, and voltage value is reduced to 0, is lacked of proper care in idle situation when triode Q5 breaks down or is in, three poles
Pipe Q4 conducting carries out electric current and releases, and voltage value is reduced to 0, zener diode D3 keeps the voltage clamp of two interpolars predetermined in one
Value guarantees voltage output end output voltage in the normal range, and protection rear class precision electronic element is without damage.
(3) surge protection circuit of vehicle power supply provided by the utility model includes arc suppressing circuit, including power electricity
The coil of L1, diode D2 and diode D7, power inductance L1 are felt when switching circuit conducting switches with dissengaged positions, are produced
Raw high-voltage electromagnetic energy is discharged by diode D2, and the electric arc of switching circuit is just corresponding to be eliminated, and protective switch circuit is from electric arc
Harm；Diode D7 is reversely not turned on, and prevents high-current flow to voltage input end B+, the work of protection is played to the power supply of front end
With.
Detailed description of the invention
Fig. 1 is the circuit diagram of the surge protection circuit of vehicle power supply in the utility model embodiment.
Specific embodiment
The embodiments of the present invention are described in further detail below in conjunction with attached drawing.
Shown in Figure 1, the utility model embodiment provides a kind of surge protection circuit of vehicle power supply, surge protection electricity
Road includes a voltage input end B+, voltage output end OUT_VCC and regulated power supply U2, in voltage input end B+ and voltage output
It holds and is equipped with a switching circuit between OUT_VCC, when the voltage of voltage input end is more than preset threshold value 36V, switching circuit is disconnected
It opens, when the voltage of voltage input end is lower than preset threshold value 36V, switching circuit is connected, and protects the precise electronic member on circuit
Part is not damaged by surge voltage.
Switching circuit includes field-effect tube Q2, triode Q3, triode Q4, triode Q5 and resistance R3, resistance R4, electricity
R6 is hindered, field-effect tube Q2 is P-channel power MOS pipe.The source electrode of field-effect tube Q2 is connected with voltage input end, field-effect tube Q2's
Be connected after gate series resistance R3 with the collector of triode Q3, and after the gate series resistance R6 of field-effect tube Q2 with it is described
Voltage input end is connected, and diode D4 is parallel on resistance R6, and the anode of diode D4 is connected with the grid of field-effect tube Q2, bears
Pole is connected with the source electrode of field-effect tube Q2, and the grid of field-effect tube Q2 is connected by resistance R3 with the collector of triode Q3, field
The drain electrode of effect pipe Q2 is connected with voltage output end.The base stage of triode Q3 is connected with the collector of triode Q5, triode Q4
Base stage be connected with voltage output end by resistance R4, the emitter of triode Q3, Q4 and Q5 are all grounded.
The main operational principle of switching circuit in the surge protection circuit of the utility model vehicle power supply are as follows: due to voltage
The end input terminal B+, which will appear, instantaneously crosses surge voltage, the voltage value of general surge voltage far more than circuit normal working voltage, when
When voltage input end B+ voltage value is more than that scheduled threshold value 36V surge occurs, field-effect tube Q2 is disconnected, triode Q3 cut-off, and three
Pole pipe Q5 is connected and carries out electric current and releases, and voltage value is reduced to 0, and switching circuit moment disconnects, to protect other essences on circuit
Cipher telegram subcomponent；And in the case that triode Q5 breaks down or lacks of proper care, triode Q4 conducting, the same electric current that carries out is released,
The voltage that voltage value will be worked normally for triode Q4, zener diode D3 keep the voltage clamp of two interpolars predetermined in one
Value guarantees voltage output end output voltage in the normal range, and protection rear class precision electronic element is without damage.Work as voltage input
When holding B+ voltage value normal, lower than the conducting voltage of triode Q4 and Q5, triode Q4 cut-off, field-effect tube Q2 work, three poles
Pipe Q5 cut-off, triode Q3 conducting, switching circuit connection, circuit work normally.
As shown in Figure 1, surge protection circuit includes that a rear class protects circuit, rear class protection circuit is for protecting regulated power supply
U2 and control of product chip are not damaged by surge, it is ensured that and regulated power supply U2 provides burning voltage 5V for control of product chip stabilization,
Because of the entire circuit of control of product chip controls and each precision electronic element, once it is damaged, circuit be can not work normally.
Rear class protection circuit includes triode Q1, resistance R1, resistance R2 and diode D1, the one end resistance R1 and voltage input
End is connected, and is grounded after other end series resistance R2, the base stage of triode Q1 is connected between resistance R1 and resistance R2, triode Q1
Emitter ground connection, the collector of triode Q1 is connected by diode D1 with the input terminal of regulated power supply, voltage of voltage regulation it is defeated
Outlet connects control of product chip.
The main operational principle of rear class protection circuit in the surge protection circuit of the utility model vehicle power supply are as follows: work as electricity
When pressure input terminal B+ voltage value is more than that scheduled threshold value 36V surge occurs, triode Q1 conducting, while zener diode D1 work
Make, the high impedance of its two interpolar can be become Low ESR, be absorbed up to thousands of by it with the speed of 10 minus 12 power second-time
Watt surge power, make the voltage clamp of two interpolars in a predetermined value, protect regulated power supply without damage, persistently rear class is given to produce
Product control chip provides stable voltage, from the damage of surge pulse while making its normal work, thus to entire circuit
It plays a very good protection.When voltage input end B+ voltage value is electric lower than the triggering that scheduled threshold value does not reach triode Q1
When pressure, triode Q1 cut-off, regulated power supply is worked normally.
As shown in Figure 1, surge protection circuit further includes the arc suppression being equipped between voltage input end and switching circuit
Circuit, arc suppressing circuit include power inductance L1, diode D2 and diode D7, and diode D2 and power inductance L1 are in parallel
It connects afterwards with diode D7, the anode of diode D2 is connected with switching circuit, the cathode of diode D2 and the cathode of diode D7
It is connected, the anode of diode D7 is connected with voltage input end.
When switching circuit conducting switches with dissengaged positions, electric arc, high-voltage electricity produced by the coil of power inductance L1 are generated
Magnetic energy diode D2 switched on is discharged, and while protecting power inductance L1, the electric arc of switching circuit is just corresponding to be eliminated,
Protective switch circuit is from the harm of electric arc, while diode D7 is reversely not turned on, and prevents high-current flow to voltage input end B+,
Play the role of protection to the power supply of front end.
Preferably, rear class protection circuit further includes diode D5, and the anode of diode D5 is connected with voltage input end, cathode
It is connected with the input terminal of resistance R1 and voltage of voltage regulation.Diode D5 has one-way conduction, under forward voltage effect, conducting
Resistance very little, when backward voltage acts on, resistance is very big, has the function of optimizing circuit.
Preferably, voltage input end is in series with resistance R7 and resistance R8, and one end of resistance R7 is connected with voltage input end, electricity
The other end of resistance R7 is grounded after connecting with resistance R8, and the base stage of triode Q5 is connected between resistance R7 and resistance R8.Resistance R7
There is certain resistance value with resistance R8, play certain partial pressure protective effect in circuit.
Preferably, resistance R9 and diode D6 are in series on the Switching Power Supply ACC of switching circuit, on diode D6 also simultaneously
It is associated with resistance R10, one end of resistance R9 is connected with Switching Power Supply, and the other end is connected with diode D6 and resistance R10, diode D6
Plus earth, the base stage of triode Q3 is connected between resistance R9 and diode D6.Here diode D6 mainly plays protection
Effect optimizes circuit.
The utility model is not only limited to above-mentioned preferred forms, anyone can obtain under the enlightenment of the utility model
Other various forms of products out, however, make any variation in its shape or structure, it is all to have and the utility model phase
Same or similar technical solution, within its protection scope.
Claims (10)
1. a kind of surge protection circuit of vehicle power supply, characterized in that it comprises:
One voltage input end, voltage output end and regulated power supply；
One switching circuit, the switching circuit are set between the voltage input end and voltage output end, and defeated in the voltage
When entering the voltage at end more than preset threshold value, the switching circuit is disconnected, and is lower than in the voltage of the voltage input end preset
When threshold value, the switching circuit is connected；
One rear class protects circuit, and rear class protection circuit includes triode Q1, resistance R1, resistance R2 and diode D1, described
The one end resistance R1 is connected with the voltage input end, is grounded after other end series resistance R2, the base stage connection of the triode Q1
Between the resistance R1 and resistance R2, the emitter of the triode Q1 is grounded, and the collector of the triode Q1 passes through institute
It states diode D1 to be connected with the input terminal of the regulated power supply, the output end of the regulated power supply connects a control of product chip.
2. a kind of surge protection circuit of vehicle power supply as described in claim 1, it is characterised in that: the switching circuit includes
Field-effect tube Q2, triode Q3, triode Q4, triode Q5 and resistance R3, resistance R4, resistance R6, the field-effect tube Q2's
Source electrode is connected with the voltage input end, after the gate series resistance R3 of the field-effect tube Q2 with the current collection of the triode Q3
Extremely it is connected, and is connected after the gate series resistance R6 of the field-effect tube Q2 with the voltage input end, the field-effect tube Q2
Drain electrode be connected with the voltage output end, the collector and triode Q5 of the base stage of the triode Q3 and the triode Q4
Collector be connected, the base stage of the triode Q4 is connected by resistance R4 with the voltage output end, the triode Q3
Emitter, the emitter of triode Q4 and the emitter of triode Q5 be grounded.
3. a kind of surge protection circuit of vehicle power supply as described in claim 1, it is characterised in that: in the voltage input end
Be additionally provided with an arc suppressing circuit between switching circuit, the arc suppressing circuit include power inductance L1, diode D2 and
It connects after diode D7, the diode D2 and power inductance L1 are in parallel with the diode D7, the anode of the diode D2
It is connected with the switching circuit, the cathode of the diode D2 is connected with the cathode of the diode D7, the diode D7's
It is positive to be connected with the voltage input end.
4. a kind of surge protection circuit of vehicle power supply as claimed in claim 2, it is characterised in that: the switching circuit also wraps
Diode D3 is included, the anode of the diode D3 is respectively connected with electricity yin R4 and electricity yin R5, the other end ground connection of the electricity yin R5,
The cathode of the diode D3 is connected with the voltage output end.
5. a kind of surge protection circuit of vehicle power supply as claimed in claim 4, it is characterised in that: the switching circuit also wraps
Diode D4 is included, the diode D4 is in parallel with resistance R6.
6. a kind of surge protection circuit of vehicle power supply as claimed in claim 5, it is characterised in that: the diode D1, two
Pole pipe D3 and diode D4 is zener diode.
7. a kind of surge protection circuit of vehicle power supply as claimed in claim 2, it is characterised in that: the field-effect tube Q2 is
PMOS tube.
8. a kind of surge protection circuit of vehicle power supply as claimed in claim 7, it is characterised in that: the rear class protects circuit
It further include diode D5, the anode of the diode D5 is connected with the voltage input end, the cathode of the diode D5 and institute
Resistance R1 is stated to be connected with the input terminal of the regulated power supply.
9. a kind of surge protection circuit of vehicle power supply as claimed in claim 2, it is characterised in that: the voltage input end string
It is associated with resistance R7 and resistance R8, the one end the resistance R7 is connected with the voltage input end, and the other end is connected after the resistance R8
Ground connection, the base stage of the triode Q5 are connected between the resistance R7 and resistance R8.
10. a kind of surge protection circuit of vehicle power supply as claimed in claim 2, it is characterised in that: the switching circuit is also
Including a Switching Power Supply and resistance R9, the Switching Power Supply connect after the resistance R9 with the base stage of the triode Q3, described
The collector of triode Q4 is connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821289645.1U CN208782473U (en) | 2018-08-10 | 2018-08-10 | A kind of surge protection circuit of vehicle power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821289645.1U CN208782473U (en) | 2018-08-10 | 2018-08-10 | A kind of surge protection circuit of vehicle power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208782473U true CN208782473U (en) | 2019-04-23 |
Family
ID=66156556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821289645.1U Active CN208782473U (en) | 2018-08-10 | 2018-08-10 | A kind of surge protection circuit of vehicle power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208782473U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571776A (en) * | 2019-07-10 | 2019-12-13 | 上海艾为电子技术股份有限公司 | surge protection circuit |
-
2018
- 2018-08-10 CN CN201821289645.1U patent/CN208782473U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110571776A (en) * | 2019-07-10 | 2019-12-13 | 上海艾为电子技术股份有限公司 | surge protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103346763B (en) | A kind of igbt Drive Protecting Circuit | |
| CN106602501B (en) | Current-limiting protection circuit | |
| CN107394753B (en) | A kind of soft switching protection circuit and method for power device | |
| CN103474954A (en) | Overvoltage and undervoltage protective circuit based on three-end adjustable shunt reference source | |
| CN208782473U (en) | A kind of surge protection circuit of vehicle power supply | |
| CN207612045U (en) | A kind of protection chip | |
| CN203367965U (en) | High voltage arc extinction timing control circuit | |
| CN104917164A (en) | Driving protection circuit | |
| CN113437858A (en) | Intelligent power module driving circuit, intelligent power module and household appliance | |
| CN105351161A (en) | Hall electric propulsion engine cathode pulse voltage ignition power source and method | |
| CN205791448U (en) | A kind of rotation becomes excitation hiccup protections circuit and rotation becomes exciting circuit | |
| CN201341015Y (en) | Overvoltage protector for self excited generator | |
| CN201398073Y (en) | Novel power supply safety protection system | |
| CN203553906U (en) | Protection circuit for input voltage of switch power supply | |
| CN106849926B (en) | Wide-voltage NMOS switch control circuit | |
| CN202004428U (en) | Surge-blocking-type protection circuit | |
| CN209709680U (en) | Direct current supply switching circuit | |
| CN108288850B (en) | Voltage conversion input/output low-end conduction protection circuit | |
| CN205141981U (en) | Train normally open solenoid valve power driving circuit based on input is clamped down on | |
| CN207732419U (en) | A kind of protective device of chip I/O Interface | |
| CN209030165U (en) | A kind of High-power amplifier control protection electric circuit | |
| CN220342299U (en) | MOS tube controlled heavy current switch circuit | |
| CN209805668U (en) | circuit for inhibiting MOS tube turn-off peak | |
| CN203580845U (en) | Automobile circuit protection device capable of stabilizing voltage smoothly | |
| CN203580844U (en) | Automobile synthetic circuit protector capable of stabilizing voltage smoothly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |