CN206506320U - A kind of current foldback circuit for automobile starting power supply - Google Patents
A kind of current foldback circuit for automobile starting power supply Download PDFInfo
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- CN206506320U CN206506320U CN201720082867.5U CN201720082867U CN206506320U CN 206506320 U CN206506320 U CN 206506320U CN 201720082867 U CN201720082867 U CN 201720082867U CN 206506320 U CN206506320 U CN 206506320U
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- resistance
- power supply
- starting power
- automobile starting
- operational amplifier
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Abstract
A kind of the utility model more particularly to current foldback circuit for automobile starting power supply, including operational amplifier, measurement resistance R18 and boosting protection chip U9；R18 is serially connected in the front-end power loop of automobile starting power supply；R18 first end connects the in-phase input end of operational amplifier through resistance R39；The second end the inverting input of operational amplifier is connect through resistance R36；Bridging has resistance R40 between the output end and inverting input of operational amplifier；The output end of operational amplifier connects with U9 feedback end FB.The circuit for the operational amplifier that the utility model is used is see-saw circuit, and multiplication factor is about 20 times；Increase diode D20 plays a part of preventing electric current from pouring in down a chimney, that is, ensures one-way conduction；Boosting protection chip has short-circuit protection function, and step-up discharge function in itself in addition, and can adjust output current and the size of voltage, feature-rich, and amplifying circuit and protection IC are combined, and can realize the overcurrent protection of circuit, and reliability is high.
Description
Technical field
A kind of the utility model more particularly to current foldback circuit for automobile starting power supply.
Background technology
Automobile portable power source belongs to the portable power source of special purpose, when the energy storage that use external circuit is automobile starting power supply
When module charges, if electric current is excessive, the damage of battery and circuit board can be not only caused, is also easy to cause the blast of battery, therefore,
It is necessary to design a kind of current foldback circuit for automobile starting power supply.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of current foldback circuit for automobile starting power supply,
The current foldback circuit for being used for automobile starting power supply is combined using operational amplifier with boosting protection chip, is protected with excessively stream
Protective function, it is safe.
The technical solution of utility model is as follows：
A kind of current foldback circuit for automobile starting power supply, including operational amplifier (U1-B), measurement resistance R18 and
Boosting protection chip U9；
Measurement resistance R18 is serially connected in the front-end power loop of automobile starting power supply；
Measurement resistance R18 first end connects the in-phase input end of operational amplifier through resistance R39；Measure the of resistance R18
Two ends connect the inverting input of operational amplifier through resistance R36；
Bridging has resistance R40 between the output end and inverting input of operational amplifier；
The output end of operational amplifier connects with boosting protection chip U9 feedback end FB.
The output end of operational amplifier is connected by diode D20 with boosting protection chip U9 feedback end FB；And feedback
End FB connects diode D20 negative pole.
Described front-end power loop is USB current supply circuits (being charged by the energy-storage module that USB interface is startup power supply)；
Measure resistance R18 first end ground connection (SGND)；Measure resistance R18 the second termination USB charging inlets J4 negative terminal BAT1-.
The model LM258ADR of operational amplifier, boosting protection chip U9 model FP5139, resistance R18, R39,
R36 and R40 resistance is respectively 0.01 ohm, 1K ohm, 1K ohm and 20K ohm.
Diode D20 is BAT54HT1 type diodes.
Electric capacity C66 is parallel with resistance R41；C66 is 0.1uF.
Electric capacity C65 is parallel with resistance R40；C65 is 0.1uF.
Boosting protection chip U9 feedback end FB meets the anode BAT+ of energy-storage module by resistance R27；R27 is 47K ohm；
Boosting protection chip U9 feedback end FB is grounded through resistance R28；R28 is 2k ohm.
Beneficial effect：
Current foldback circuit of the present utility model for automobile starting power supply, the circuit of the operational amplifier used is anti-
Phase amplifying circuit, multiplication factor is about 20 times；Increase diode D20 plays a part of preventing electric current from pouring in down a chimney, that is, ensures and unidirectionally lead
It is logical；Boosting protection chip has short-circuit protection function, an and step-up discharge function in itself in addition, and can adjust output current and
The size of voltage, feature-rich, amplifying circuit and protection IC are combined, and can realize the overcurrent protection of circuit, and reliability is high.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the current foldback circuit for automobile starting power supply；
Fig. 2 is the circuit theory diagrams of USB part.
Embodiment
For the ease of understanding the utility model, below in conjunction with Figure of description and preferred embodiment to practical new herein
Type, which is done, more comprehensively, meticulously to be described, but protection domain of the present utility model is not limited to specific embodiment.
Unless otherwise defined, all technical terms used hereinafter are generally understood that implication phase with those skilled in the art
Together.Technical term used herein is intended merely to describe the purpose of specific embodiment, is not intended to and limits this practicality newly
The protection domain of type.
Embodiment 1：
Such as Fig. 1 and 2, a kind of current foldback circuit for automobile starting power supply, including operational amplifier U1-B, measurement electricity
Hinder R18 and boosting protection chip U9；
Measurement resistance R18 is serially connected in the front-end power loop of automobile starting power supply；
Measurement resistance R18 first end connects the in-phase input end of operational amplifier through resistance R39；Measure the of resistance R18
Two ends connect the inverting input of operational amplifier through resistance R36；
Bridging has resistance R40 between the output end and inverting input of operational amplifier；
The output end of operational amplifier connects with boosting protection chip U9 feedback end FB.
The output end of operational amplifier is connected by diode D20 with boosting protection chip U9 feedback end FB；And feedback
End FB connects diode D20 negative pole.
Described front-end power loop is USB current supply circuits (being charged by the energy-storage module that USB interface is startup power supply)；
Measure resistance R18 first end ground connection (SGND)；Measure resistance R18 the second termination USB charging inlets J4 negative terminal BAT1-.
The model LM258ADR of operational amplifier, boosting protection chip U9 model FP5139, resistance R18, R39,
R36 and R40 resistance is respectively 0.01 ohm, 1K ohm, 1K ohm and 20K ohm.
Claims (10)
1. a kind of current foldback circuit for automobile starting power supply, it is characterised in that including operational amplifier (U1-B), measurement
Resistance R18 and boosting protection chip U9；
Measurement resistance R18 is serially connected in the front-end power loop of automobile starting power supply；
Measurement resistance R18 first end connects the in-phase input end of operational amplifier through resistance R39；Measure resistance R18 the second end
The inverting input of operational amplifier is connect through resistance R36；
Bridging has resistance R40 between the output end and inverting input of operational amplifier；
The output end of operational amplifier connects with boosting protection chip U9 feedback end FB.
2. the current foldback circuit according to claim 1 for automobile starting power supply, it is characterised in that operational amplifier
Output end connected by diode D20 with boosting protection chip U9 feedback end FB；And feedback end FB connects the negative of diode D20
Pole.
3. the current foldback circuit according to claim 1 for automobile starting power supply, it is characterised in that described front end
Current supply circuit is USB current supply circuits；Measure resistance R18 first end ground connection；Measure resistance R18 the second termination USB chargings
Mouth J4 negative terminal BAT1-.
4. the current foldback circuit for automobile starting power supply according to claim any one of 1-3, it is characterised in that fortune
Calculate the model LM258ADR of amplifier.
5. the current foldback circuit according to claim 4 for automobile starting power supply, it is characterised in that boosting protection core
Piece U9 model FP5139.
6. the current foldback circuit according to claim 5 for automobile starting power supply, it is characterised in that resistance R18,
R39, R36 and R40 resistance are respectively 0.01 ohm, 1K ohm, 1K ohm and 20K ohm.
7. the current foldback circuit according to claim 2 for automobile starting power supply, it is characterised in that diode D20
For BAT54HT1 type diodes.
8. the current foldback circuit according to claim 7 for automobile starting power supply, it is characterised in that at resistance R41
It is parallel with electric capacity C66；C66 is 0.1uF.
9. the current foldback circuit according to claim 8 for automobile starting power supply, it is characterised in that at resistance R40
It is parallel with electric capacity C65；C65 is 0.1uF.
10. the current foldback circuit according to claim 8 for automobile starting power supply, it is characterised in that boosting protection
Chip U9 feedback end FB meets the anode BAT+ of energy-storage module by resistance R27；R27 is 47K ohm；
Boosting protection chip U9 feedback end FB is grounded through resistance R28；R28 is 2k ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720082867.5U CN206506320U (en) | 2017-01-22 | 2017-01-22 | A kind of current foldback circuit for automobile starting power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720082867.5U CN206506320U (en) | 2017-01-22 | 2017-01-22 | A kind of current foldback circuit for automobile starting power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206506320U true CN206506320U (en) | 2017-09-19 |
Family
ID=59833656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720082867.5U Active CN206506320U (en) | 2017-01-22 | 2017-01-22 | A kind of current foldback circuit for automobile starting power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206506320U (en) |
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2017
- 2017-01-22 CN CN201720082867.5U patent/CN206506320U/en active Active
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