CN207229284U - A kind of automobile starter starts overheating protection circuit - Google Patents
A kind of automobile starter starts overheating protection circuit Download PDFInfo
- Publication number
- CN207229284U CN207229284U CN201720949839.9U CN201720949839U CN207229284U CN 207229284 U CN207229284 U CN 207229284U CN 201720949839 U CN201720949839 U CN 201720949839U CN 207229284 U CN207229284 U CN 207229284U
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- resistance
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- metal
- capacitance
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Abstract
The utility model belongs to automobile starting starter protection field of circuit technology, and in particular to a kind of automobile starter starts overheating protection circuit.A kind of starter starts overheating protection circuit, reference voltage chip connects the negative-phase input and positive input of comparator A by resistance and resistance respectively, resistor coupled in parallel connects capacitance and resistance, capacitance and resistance are connected in series, the junction of capacitance and resistance is grounded at the same time, negative-feedback capacitance is connected in parallel between the negative-phase input and output terminal of comparator A, comparator A positive inputs are connected in parallel positive feedback resistor, the negative-phase input of comparator A connects temperature sensor by resistance, the other end ground connection of temperature sensor, temperature sensor is connected in parallel to capacitance, the output terminal of comparator A connects the grid of metal-oxide-semiconductor by resistance, the relay of the drain electrode connection starter of metal-oxide-semiconductor, the source electrode connection power supply of metal-oxide-semiconductor, resistance is connected between the source electrode and grid of the metal-oxide-semiconductor.The utility model is simple in structure.
Description
Technical field
The utility model belongs to automobile starter starting protection field of circuit technology, and in particular to a kind of automobile starter opens
Dynamic overheating protection circuit.
Background technology
The starting current of automobile is very big, and the power cord of starter is directly connected to storage battery, its break-make is generally opened by igniting
Close to realize the connection to power supply, if firing key is constantly in startup shelves and cannot reset in start-up course, igniting
Switch is constantly in closure, and lasting electric current produces heat, and temperature very high will be easy on fire for a long time, this will
Fire hazard is brought to vehicle.
The content of the invention
Started the purpose of this utility model is that providing a kind of automobile starter for problems of the prior art
Thermal protection circuit.
The technical solution of the utility model is：
A kind of automobile starter starts overheating protection circuit, including reference voltage chip and metal-oxide-semiconductor Q, benchmark electricity
Pressure chip connects the negative-phase input and positive input of comparator A by resistance R2 and resistance R3 respectively, and resistance R3 is in parallel even
Capacitance C1 and resistance R4 are met, capacitance C1 and resistance R4 are connected in series, and the junction of capacitance C1 and resistance R4 are grounded at the same time, comparator
Negative-feedback capacitance C2 is connected in parallel between the negative-phase input and output terminal of A, comparator A positive inputs are connected in parallel positive feedback
The negative-phase input of resistance R5, comparator A are grounded by resistance R6 connection temperature sensors, the other end of temperature sensor, temperature
Degree sensor parallel is connected with capacitance C3, and the output terminal of comparator A passes through the grid of resistance R7 connection metal-oxide-semiconductors Q, the leakage of metal-oxide-semiconductor Q
Pole connects the relay of starter, and the source electrode connection power supply of metal-oxide-semiconductor Q, connects electricity between the source electrode and grid of the metal-oxide-semiconductor Q
Hinder R8.
Specifically, the reference voltage chip uses TL431 chips.
Specifically, the temperature sensor is thermistor RT.
Specifically, the metal-oxide-semiconductor Q is P-channel field-effect transistor (PEFT) pipe.
Specifically, one end ground connection of the TL431 chips, the other end pass through resistance R1 connection power supplys.
The beneficial effects of the utility model are：It is simple in structure, by metal-oxide-semiconductor shut-off control start starter startup or
Person close, by the utility model can effectively protect storage battery and starter during automobile starting it is without damage.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the utility model.
Embodiment
Start the circuit diagram of overheating protection circuit, including reference voltage TL431 cores for a kind of automobile starter as shown in Figure 1
One end of piece and metal-oxide-semiconductor Q, TL431 chip is grounded, and the other end passes through resistance R1 connection power supplys.The reference voltage chip leads to
Negative-phase input and positive input that resistance R2 and resistance R3 connects comparator A respectively are crossed, resistance R3 is connected in parallel capacitance C1
It is connected in series with resistance R4, capacitance C1 and resistance R4, the junction of capacitance C1 and resistance R4 are grounded at the same time, the negative of comparator A
Negative-feedback capacitance C2 is connected in parallel between input terminal and output terminal, comparator A positive inputs are connected in parallel positive feedback resistor R5,
The negative-phase input of comparator A is grounded by the other end of resistance R6 connections thermistor RT, thermistor RT, thermistor RT
It is connected in parallel to capacitance C3, the output terminal of comparator A is connected by the grid of resistance R7 connection metal-oxide-semiconductors Q, the drain electrode of metal-oxide-semiconductor Q
The relay of motivation, the source electrode connection power supply of metal-oxide-semiconductor Q, connects resistance R8 between the source electrode and grid of the metal-oxide-semiconductor Q.
The metal-oxide-semiconductor Q is P-channel field-effect transistor (PEFT) pipe.
The operation principle of the utility model is：By the offer reference voltage of reference voltage TL431, pass through comparison resistance R3
Comparison with comparison resistance R4 provides a reference voltage value to the positive input of comparator A, and the negative of comparator A inputs
The fluctuation voltage value of end collection thermistor RT, when thermistor RT changes its negative for being supplied to comparator A with temperature
The magnitude of voltage of input terminal can also change, and thermistor RT temperature is higher, and the potential value of the negative-phase input of comparator A is lower, and
The current potential of the output terminal of comparator A can be higher, while the current potential at the grid of metal-oxide-semiconductor Q is also higher, when height arrives certain value, MOS
No current circulates between the source electrode of pipe Q and drain electrode, metal-oxide-semiconductor Q shut-offs, also results in the power-off of starter starting relay and closes, reaches
To the purpose of overheat protector.
Finally it should be noted that:Above example is only illustrating the technical solution of the utility model rather than it is limited
System；Although the utility model is described in detail with reference to preferred embodiment, those of ordinary skill in the art should
Understand：It can still modify to specific embodiment of the present utility model or some technical characteristics are equally replaced
Change；Without departing from the spirit of technical solutions of the utility model, it should all cover in the claimed technical solution of the utility model
Among scope.
Claims (5)
1. a kind of automobile starter starts overheating protection circuit, including reference voltage chip and metal-oxide-semiconductor Q, it is characterised in that described
Reference voltage chip connect the negative-phase input and positive input of comparator A, resistance respectively by resistance R2 and resistance R3
R3 is connected in parallel capacitance C1 and resistance R4, and capacitance C1 and resistance R4 are connected in series, and the junction of capacitance C1 and resistance R4 connect at the same time
Ground, is connected in parallel the parallel connection of negative-feedback capacitance C2, comparator A positive input between the negative-phase input and output terminal of comparator A
Connect positive feedback resistor R5, the negative-phase input of comparator A by resistance R6 connection temperature sensors, temperature sensor it is another
End ground connection, temperature sensor are connected in parallel to capacitance C3, the output terminal of comparator A by the grid of resistance R7 connection metal-oxide-semiconductors Q,
The relay of the drain electrode connection starter of metal-oxide-semiconductor Q, the source electrode connection power supply of metal-oxide-semiconductor Q, the source electrode and grid of the metal-oxide-semiconductor Q
Between connect resistance R8.
2. automobile starter starts overheating protection circuit according to claim 1, it is characterised in that the reference voltage core
Piece uses TL431 chips.
3. automobile starter starts overheating protection circuit according to claim 1, it is characterised in that the temperature sensor
For thermistor RT.
4. automobile starter starts overheating protection circuit according to claim 1, it is characterised in that the metal-oxide-semiconductor Q is P
Channel field-effect pipe.
5. automobile starter starts overheating protection circuit according to claim 2, it is characterised in that the TL431 chips
One end is grounded, and the other end passes through resistance R1 connection power supplys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720949839.9U CN207229284U (en) | 2017-08-01 | 2017-08-01 | A kind of automobile starter starts overheating protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720949839.9U CN207229284U (en) | 2017-08-01 | 2017-08-01 | A kind of automobile starter starts overheating protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207229284U true CN207229284U (en) | 2018-04-13 |
Family
ID=61855352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720949839.9U Expired - Fee Related CN207229284U (en) | 2017-08-01 | 2017-08-01 | A kind of automobile starter starts overheating protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207229284U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852712A (en) * | 2019-04-24 | 2020-10-30 | 本田技研工业株式会社 | Control device for internal combustion engine |
-
2017
- 2017-08-01 CN CN201720949839.9U patent/CN207229284U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111852712A (en) * | 2019-04-24 | 2020-10-30 | 本田技研工业株式会社 | Control device for internal combustion engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180413 Termination date: 20200801 |