CN206668409U - The product protection circuit that a kind of high pressure when realizing engine loading bust suppresses - Google Patents
The product protection circuit that a kind of high pressure when realizing engine loading bust suppresses Download PDFInfo
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- CN206668409U CN206668409U CN201720008851.XU CN201720008851U CN206668409U CN 206668409 U CN206668409 U CN 206668409U CN 201720008851 U CN201720008851 U CN 201720008851U CN 206668409 U CN206668409 U CN 206668409U
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Abstract
The utility model discloses it is a kind of realize engine loading bust when high pressure suppress product protection circuit; including resistance R1~R5, voltage-stabiliser tube Z1~Z2, voltage-reference TL431; PMOS Q1 and transistor Q2; wherein PMOS Q1 source electrodes connection power input Vin; drain electrode is used as power output end Vout, and grid passes sequentially through resistance R4 and transistor Q2 ground connection；The resistance R1 and R5 is connected on Vin and pressure sampling circuit is formed between ground, and sampling voltage output connects TL431 REF ends, TL431 plus earth, and negative electrode passes through resistance R2 connections Vin, the base stage by voltage-stabiliser tube Z2 connection transistors Q2 respectively；The power input Vin also passes through the voltage-stabiliser tube Z1 of parallel connection, resistance R3 connection PMOSs Q1 grid respectively.The product protection circuit that high pressure provided by the utility model when realizing engine loading bust using discrete component suppresses, not only effectively reduces cost, Vout compares Vin pressure drop very littles, and also can normal work in the very low situation of cell voltage.
Description
Technical field
Engine protection is the utility model is related to, when more particularly to one kind realizes engine loading bust using discrete component
The product protection circuit that high pressure suppresses.
Background technology
Load dump occurs in startup moment in engine engine（Load dump）Phenomenon, this load dump can produce
Very high voltage of raw moment, as fruit product can not suppress this high voltage, product will be caused greatly to destroy, sometimes very
To leading to major accident.
Suppress this high-tension purpose to reach, traditional method is usually to use transient voltage suppressor diode
（TVS）To be protected, if only with TVS pipe mode, because this TVS pipe needs moment to absorb great energy, because
This just needs to select powerful TVS pipe to achieve the goal, and will so greatly increase the cost of product；Another way is
The series resistance between power input and TVS pipe, allow resistance to share and sponge portion of energy, so as to select low cost,
Low power TVS pipe, but such do can produce a drawback：I.e. due to the presence of series resistance, meeting when electric current flows through the resistance
Produce certain pressure drop, so when vehicle battery voltage is somewhat relatively low, product will because power input voltage is too low and nothing
Method works.
Utility model content
The purpose of the utility model is：The production that a kind of high pressure when realizing engine loading bust using discrete component suppresses is provided
Product protection circuit, the defects of overcoming existing load dump protection circuit.
The technical solution of the utility model is：
The product protection circuit that a kind of high pressure when realizing engine loading bust suppresses, including resistance R1~R5, voltage-stabiliser tube
Z1~Z2, voltage-reference TL431, PMOS Q1 and transistor Q2, wherein PMOS Q1 source electrodes connect power input Vin,
Drain electrode is used as power output end Vout, and grid passes sequentially through resistance R4 and transistor Q2 ground connection；
The resistance R1 and R5 is connected on Vin and pressure sampling circuit, sampling voltage output connection TL431 is formed between ground
REF ends, TL431 plus earth, negative electrode respectively by resistance R2 connections Vin, pass through voltage-stabiliser tube Z2 connection transistors Q2's
Base stage；
The power input Vin also passes through the voltage-stabiliser tube Z1 of parallel connection, resistance R3 connection PMOSs Q1 grid respectively.
Specifically, the anode connection PMOS Q1 of voltage-stabiliser tube Z1 grid, negative electrode connection power input Vin.
The anode connection transistor Q2 of voltage-stabiliser tube Z2 base stage, negative electrode connect TL431 negative electrode.
Preferably, the transistor Q2 is NPN triode, the grid that Q2 colelctor electrode passes through resistance R4 connection PMOSs Q1
Pole, grounded emitter.
The utility model has the advantages that：
The product protection that high pressure provided by the utility model when realizing engine loading bust using discrete component suppresses
Circuit, cost is not only effectively reduced, Vout compares Vin pressure drop very littles, and also can be normal in the very low situation of cell voltage
Work.
Brief description of the drawings
Below in conjunction with the accompanying drawings and embodiment is further described to the utility model：
Fig. 1 is the principle for the product protection circuit that high pressure described in the utility model when realizing engine loading bust suppresses
Figure；
Fig. 2 is the simulation high voltage transient signal for requiring application in embodiment according to SAE J1455 4.11.2.2.1 standards；
Fig. 3 is the simulation high voltage transient signal for requiring application in embodiment according to SAE J1810 4.3.2 standards.
Embodiment
As described in Figure 1, the product protection electricity that high pressure when realizing engine loading bust disclosed in the utility model suppresses
Road, including resistance R1~R5, voltage-stabiliser tube Z1~Z2, voltage-reference TL431, PMOS Q1 and transistor Q2, wherein TL431 by
Z3 is identified, and PMOS Q1 source electrodes connection power input Vin, drain electrode is used as power output end Vout, and grid passes sequentially through resistance
R4 and transistor Q2 ground connection；The resistance R1 and R5 is connected on Vin and pressure sampling circuit, sampling voltage output is formed between ground
Connect TL431 REF ends, TL431 plus earth, negative electrode respectively by resistance R2 connections Vin, pass through voltage-stabiliser tube Z2 connections crystalline substance
Body pipe Q2 base stage, the power input Vin also pass through the voltage-stabiliser tube Z1 of parallel connection, resistance R3 connection PMOSs Q1 grid respectively
Pole.The anode connection PMOS Q1 of voltage-stabiliser tube Z1 grid, negative electrode connection power input Vin.The voltage-stabiliser tube Z2's
Anode connection transistor Q2 base stage, negative electrode connect TL431 negative electrode.The transistor Q2 is NPN triode, Q2 colelctor electrode
Pass through resistance R4 connection PMOSs Q1 grid, grounded emitter.
In product normal work, transistor Q2 is in the conduction state, and PMOS Q1 grids are low level, and Q1 is on
State, due to metal-oxide-semiconductor internal resistance very little, so avoid the problem of traditional design produces larger pressure drop using series resistance.
When engine engine starts, because load dump can produce a high voltage in power input Vin, when
Voltage exceedes after R1, R5 partial pressure during the reference voltage of Z3 voltage-stabiliser tubes, and Z3 conductings, at this moment Q2 is closed, so that Q1 ends, this
Avoid high voltage and destruction is produced to the circuit behind Vout.
The utility model is carried out by the high voltage transient signal when power input port applies fictitious load bust
Test, product is still intact, meets the requirement of SAE J1455 4.11.2.2.1 and SAE J1810 4.3.2 standards.
Fig. 2 is the simulation high voltage transient signal that application is required according to SAE J1455 4.11.2.2.1 standards.
Fig. 3 is the simulation high voltage transient signal that application is required according to SAE J1810 4.3.2 standards.
For above-described embodiment only to illustrate technical concepts and features of the present utility model, its object is to allow be familiar with technique
People can understand content of the present utility model and implement according to this, the scope of protection of the utility model can not be limited with this.It is all
The modification done according to the Spirit Essence of the utility model main technical schemes, it should all cover in the scope of protection of the utility model
Within.
Claims (4)
- A kind of 1. product protection circuit that high pressure when realizing engine loading bust suppresses, it is characterised in that：Including resistance R1~ R5, voltage-stabiliser tube Z1~Z2, voltage-reference TL431, PMOS Q1 and transistor Q2, wherein PMOS Q1 source electrodes connection power supply are defeated Enter and hold Vin, drain electrode is used as power output end Vout, and grid passes sequentially through resistance R4 and transistor Q2 ground connection；The resistance R1 and R5 is connected on Vin and pressure sampling circuit is formed between ground, sampling voltage output connection TL431's REF ends, TL431 plus earth, negative electrode pass through resistance R2 connections Vin, the base by voltage-stabiliser tube Z2 connection transistors Q2 respectively Pole；The power input Vin also passes through the voltage-stabiliser tube Z1 of parallel connection, resistance R3 connection PMOSs Q1 grid respectively.
- 2. the product protection circuit that high pressure according to claim 1 when realizing engine loading bust suppresses, its feature exist In：The anode connection PMOS Q1 of voltage-stabiliser tube Z1 grid, negative electrode connection power input Vin.
- 3. the product protection circuit that high pressure according to claim 2 when realizing engine loading bust suppresses, its feature exist In：The anode connection transistor Q2 of voltage-stabiliser tube Z2 base stage, negative electrode connect TL431 negative electrode.
- 4. the product protection circuit that high pressure according to claim 3 when realizing engine loading bust suppresses, its feature exist In：The transistor Q2 is NPN triode, and Q2 colelctor electrode passes through resistance R4 connection PMOSs Q1 grid, grounded emitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720008851.XU CN206668409U (en) | 2017-01-05 | 2017-01-05 | The product protection circuit that a kind of high pressure when realizing engine loading bust suppresses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720008851.XU CN206668409U (en) | 2017-01-05 | 2017-01-05 | The product protection circuit that a kind of high pressure when realizing engine loading bust suppresses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206668409U true CN206668409U (en) | 2017-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720008851.XU Active CN206668409U (en) | 2017-01-05 | 2017-01-05 | The product protection circuit that a kind of high pressure when realizing engine loading bust suppresses |
Country Status (1)
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| CN (1) | CN206668409U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523152A (en) * | 2017-01-05 | 2017-03-22 | 科蒂斯技术（苏州）有限公司 | Product protection circuit for achieving high voltage restraining during engine load dump |
| RU2756362C2 (en) * | 2018-09-12 | 2021-09-29 | Публичное акционерное общество "МОТОР СИЧ" (АО "МОТОР СИЧ") | Locking device of vehicle engine starting with gear turned on |
-
2017
- 2017-01-05 CN CN201720008851.XU patent/CN206668409U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523152A (en) * | 2017-01-05 | 2017-03-22 | 科蒂斯技术（苏州）有限公司 | Product protection circuit for achieving high voltage restraining during engine load dump |
| RU2756362C2 (en) * | 2018-09-12 | 2021-09-29 | Публичное акционерное общество "МОТОР СИЧ" (АО "МОТОР СИЧ") | Locking device of vehicle engine starting with gear turned on |
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