CN206640308U - A kind of Vehicular power protective circuit - Google Patents
A kind of Vehicular power protective circuit Download PDFInfo
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- CN206640308U CN206640308U CN201720444344.0U CN201720444344U CN206640308U CN 206640308 U CN206640308 U CN 206640308U CN 201720444344 U CN201720444344 U CN 201720444344U CN 206640308 U CN206640308 U CN 206640308U
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Abstract
The utility model provides a kind of simple and good performance Vehicular power protective circuit, belongs to power protection field.Specifically include：The voltage output end VBAT of Vehicular accumulator cell is connected with voltage-stabiliser tube D1 anode, and voltage-stabiliser tube D1 negative electrode is connected simultaneously with the source electrode of PNP triode Q7 emitter stage, resistance R8 one end and metal-oxide-semiconductor Q8；PNP triode Q7 base stage and the resistance R8 other end, resistance R15 one end connect simultaneously；PNP triode Q7 colelctor electrode is connected simultaneously with metal-oxide-semiconductor Q8 grid and resistance R16 one end, resistance R16 other end ground connection；The resistance R15 other end is connected with voltage-stabiliser tube Z6 negative electrode, voltage-stabiliser tube Z6 plus earth；Metal-oxide-semiconductor Q8 drain electrode is connected with electrochemical capacitor C11 positive pole and electric capacity C12 one end simultaneously, and electrochemical capacitor C11 negative pole and the electric capacity C12 other end are grounded simultaneously.
Description
Technical field
A kind of power protecting circuit is the utility model is related to, more particularly to a kind of Vehicular power protective circuit.
Background technology
The drastically rise of voltage occurs in vehicle body battery in the case of throw load, and 24V bodywork systems may raise
To more than 150V.Mobile unit is attacked considering how to tackle this instantaneous high pressure at present.
General solution is directly to be protected using Transient Suppression Diode TVS, utilize Transient Suppression Diode
TVS performance absorbs strong jamming in short-term.Actual test result is the prominent transient state suppression when the extremely strong interference of energy occurs
Diode TVS processed is also only capable of resisting 3~5 times (number has obtained the accreditation of Transient Suppression Diode TVS producers).Once transient state presses down
Diode TVS damages processed lose protective effect, and electronic component below will be burned out.
High-end solution is, using the logic circuit of complexity, after judging voltage superelevation, using metal-oxide-semiconductor by power
Resistance is sealed in system, is played a protective role, but thus cost is high, and device is complicated, and power device area occupied causes greatly
Product size is excessive.
Utility model content
For above-mentioned deficiency, the utility model provides a kind of simple and good performance Vehicular power protective circuit.
A kind of Vehicular power protective circuit of the present utility model, including voltage-stabiliser tube D1, voltage-stabiliser tube Z6, PNP triode Q7,
Metal-oxide-semiconductor Q8, resistance R8, resistance R15, resistance R16, electrochemical capacitor C11 and electric capacity C12；
The voltage output end VBAT of Vehicular accumulator cell is connected with voltage-stabiliser tube D1 anode, voltage-stabiliser tube D1 negative electrode and PNP tri-
The source electrode of pole pipe Q7 emitter stage, resistance R8 one end and metal-oxide-semiconductor Q8 connects simultaneously；
PNP triode Q7 base stage and the resistance R8 other end, resistance R15 one end connect simultaneously；
PNP triode Q7 colelctor electrode is connected simultaneously with metal-oxide-semiconductor Q8 grid and resistance R16 one end, and resistance R16's is another
One end is grounded；
The resistance R15 other end is connected with voltage-stabiliser tube Z6 negative electrode, voltage-stabiliser tube Z6 plus earth；
Metal-oxide-semiconductor Q8 drain electrode is connected with electrochemical capacitor C11 positive pole and electric capacity C12 one end simultaneously, electrochemical capacitor C11's
Negative pole and electric capacity the C12 other end are grounded simultaneously.
Preferably, the model SS24 of the voltage-stabiliser tube D1, for preventing the both positive and negative polarity reversal connection of Vehicular accumulator cell.
Preferably, the resistance of the resistance R8 is 47k Ω, and resistance R15 resistance is 4.7k Ω, resistance R16 resistance
For 1M Ω.
Above-mentioned technical characteristic can in any suitable manner be combined or substituted by equivalent technical characteristic, as long as can reach
To the purpose of this utility model.
The beneficial effects of the utility model are that the protection of the utility model protection circuit is reliable, and device is less, cost compared with
It is low.
Brief description of the drawings
Fig. 1 is circuit theory schematic diagram of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the premise of creative work
Lower obtained every other embodiment, belong to the scope of the utility model protection.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the utility model can
To be mutually combined.
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings, but not as of the present utility model
Limit.Illustrate present embodiment with reference to Fig. 1, a kind of Vehicular power protective circuit described in present embodiment, including voltage-stabiliser tube D1,
Voltage-stabiliser tube Z6, PNP triode Q7, metal-oxide-semiconductor Q8, resistance R8, resistance R15, resistance R16, electrochemical capacitor C11 and electric capacity C12；
The voltage output end VBAT of Vehicular accumulator cell is connected with voltage-stabiliser tube D1 anode, voltage-stabiliser tube D1 negative electrode and PNP tri-
The source electrode of pole pipe Q7 emitter stage, resistance R8 one end and metal-oxide-semiconductor Q8 connects simultaneously；
PNP triode Q7 base stage and the resistance R8 other end, resistance R15 one end connect simultaneously；
PNP triode Q7 colelctor electrode is connected simultaneously with metal-oxide-semiconductor Q8 grid and resistance R16 one end, and resistance R16's is another
One end is grounded；
The resistance R15 other end is connected with voltage-stabiliser tube Z6 negative electrode, voltage-stabiliser tube Z6 plus earth；
Metal-oxide-semiconductor Q8 drain electrode is connected with electrochemical capacitor C11 positive pole and electric capacity C12 one end simultaneously, electrochemical capacitor C11's
Negative pole and electric capacity the C12 other end are grounded simultaneously.
Voltage-stabiliser tube D1 model SS24, for preventing the both positive and negative polarity reversal connection of Vehicular accumulator cell, cause the damage of equipment.
Resistance R8 resistance is 47k Ω, and resistance R15 resistance is 4.7k Ω, and resistance R16 resistance is 1M Ω.
Accumulator anode and cathode reversal connection resistance R8 connects partial pressure with resistance R15, as the voltage output end VBAT of Vehicular accumulator cell
When the voltage of output reaches 40V or more, PNP triode Q7 emitter stages reach 4V with base stage pressure difference, and PNP triode Q7 starts to lead
It is logical, make metal-oxide-semiconductor Q8 grid, source voltage identical, so metal-oxide-semiconductor Q8 is closed.So as to have the function that to protect rear class.
Normal operating condition is：The voltage of the voltage output end VBAT outputs of Vehicular accumulator cell is 24V, PNP triode Q7
Base stage and emitter voltage difference very little, be not enough to turn on, so metal-oxide-semiconductor Q8 grid is low-voltage, metal-oxide-semiconductor Q8 source electrode is
High voltage, pressure difference is enough to turn on metal-oxide-semiconductor Q8, so normal output voltage is to rear class.
Although the utility model is described herein with reference to specific embodiment, it should be understood that, this
A little embodiments are only principle of the present utility model and the example of application.It should therefore be understood that can be to exemplary reality
Apply example and carry out many modifications, and can be designed that other arrangements, this reality limited without departing from appended claims
With new spirit and scope.It should be understood that it can be combined by way of different from described by original claim
Different dependent claims and feature specifically described herein.It will also be appreciated that the spy with reference to described by separate embodiments
Sign can be used in other embodiments.
Claims (3)
1. a kind of Vehicular power protective circuit, it is characterised in that the protection circuit includes voltage-stabiliser tube D1, voltage-stabiliser tube Z6, PNP tri-
Pole pipe Q7, metal-oxide-semiconductor Q8, resistance R8, resistance R15, resistance R16, electrochemical capacitor C11 and electric capacity C12；
The voltage output end VBAT of Vehicular accumulator cell is connected with voltage-stabiliser tube D1 anode, voltage-stabiliser tube D1 negative electrode and PNP triode
The source electrode of Q7 emitter stage, resistance R8 one end and metal-oxide-semiconductor Q8 connects simultaneously；
PNP triode Q7 base stage and the resistance R8 other end, resistance R15 one end connect simultaneously；
PNP triode Q7 colelctor electrode is connected simultaneously with metal-oxide-semiconductor Q8 grid and resistance R16 one end, the resistance R16 other end
Ground connection；
The resistance R15 other end is connected with voltage-stabiliser tube Z6 negative electrode, voltage-stabiliser tube Z6 plus earth；
Metal-oxide-semiconductor Q8 drain electrode is connected with electrochemical capacitor C11 positive pole and electric capacity C12 one end simultaneously, electrochemical capacitor C11 negative pole
It is grounded simultaneously with the electric capacity C12 other end.
A kind of 2. Vehicular power protective circuit according to claim 1, it is characterised in that the model of the voltage-stabiliser tube D1
SS24, for preventing the both positive and negative polarity reversal connection of Vehicular accumulator cell.
3. a kind of Vehicular power protective circuit according to claim 1, it is characterised in that the resistance of the resistance R8 is
47k Ω, resistance R15 resistance are 4.7k Ω, and resistance R16 resistance is 1M Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720444344.0U CN206640308U (en) | 2017-04-25 | 2017-04-25 | A kind of Vehicular power protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720444344.0U CN206640308U (en) | 2017-04-25 | 2017-04-25 | A kind of Vehicular power protective circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206640308U true CN206640308U (en) | 2017-11-14 |
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|---|---|---|---|
| CN201720444344.0U Active CN206640308U (en) | 2017-04-25 | 2017-04-25 | A kind of Vehicular power protective circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877304A (en) * | 2017-04-25 | 2017-06-20 | 航天科技控股集团股份有限公司 | A kind of Vehicular power protective circuit |
-
2017
- 2017-04-25 CN CN201720444344.0U patent/CN206640308U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877304A (en) * | 2017-04-25 | 2017-06-20 | 航天科技控股集团股份有限公司 | A kind of Vehicular power protective circuit |
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