CN209046315U - A kind of lithium electricity charging anti-back flow circuit - Google Patents
A kind of lithium electricity charging anti-back flow circuit Download PDFInfo
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- CN209046315U CN209046315U CN201821954979.6U CN201821954979U CN209046315U CN 209046315 U CN209046315 U CN 209046315U CN 201821954979 U CN201821954979 U CN 201821954979U CN 209046315 U CN209046315 U CN 209046315U
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Abstract
The utility model belongs to a kind of lithium electricity charging anti-back flow circuit, PA1 foot connection one end resistance R4 of MCU chip and the one end resistance R5, resistance R4 other end ground connection, the grid of resistance R5 other end connection metal-oxide-semiconductor Q3, the one end resistance R7 is connected with the one end resistance R11, resistance R7 and the connecting pin resistance R11 are also connected with the ADC foot of MCU chip, the resistance R7 other end connects the one end resistance R8, the one end resistance R10 and positive pole DC+, resistance R11 other end ground connection, resistance R8 other end connecting triode Q5 collector, resistance R10 other end connecting triode Q5 base stage and the one end resistance R13, triode Q5 emitter and the resistance R13 other end meet power cathode DC-, triode Q5 collector is also connected with the one end resistance R9, resistance R9 is another One end connects metal-oxide-semiconductor Q4 grid and the one end resistance R12.With input short, reversal connection, overvoltage protection, circuit pressure drop is low.
Description
Technical field
The utility model relates to lithium battery charging technique field more particularly to a kind of lithium electricity charging anti-back flow circuits.
Background technique
Lithium battery applications are in each class of electronic devices, such as mobile phone, radio, the electronic equipment to lithium battery power supply into
When row charging, if input-voltage short circuit is perhaps excessively high or charging cable access is reversed, the circuit board of charger will be burnt,
Insecurity factor is caused, currently without a kind of simple, practical, economic, safe lithium electricity charging anti-back flow circuit.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of lithium electricity charging anti-back flow circuits, to solve existing skill
The deficiency of art.
The technical solution that the utility model solves above-mentioned technical problem is as follows: a kind of lithium electricity charging anti-back flow circuit, special
Sign is: including MCU chip, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4, triode Q5 and resistance R4, R5, R7, R8, R9, R10, R11,
R12, R13, PA1 foot connection one end resistance R4 of the MCU chip and the one end resistance R5, the resistance R4 other end ground connection, institute
State the grid of resistance R5 other end connection metal-oxide-semiconductor Q3, the one end the resistance R7 connect with the one end resistance R11, the resistance R7 with
The connecting pin resistance R11 is also connected with the ADC foot of MCU chip, and the resistance R7 other end connects the one end resistance R8, the one end resistance R10
And positive pole DC+, the resistance R11 other end ground connection, the resistance R8 other end connecting triode Q5 collector are described
Resistance R10 other end connecting triode Q5 base stage and the one end resistance R13, the triode Q5 emitter and the resistance R13 other end
Power cathode DC- is met, the triode Q5 collector is also connected with the one end resistance R9, and the resistance R9 other end connects metal-oxide-semiconductor
Q4 grid and the one end resistance R12, the metal-oxide-semiconductor Q4 source electrode and another termination power cathode DC- of resistance R12, the metal-oxide-semiconductor Q4 leakage
Pole connects metal-oxide-semiconductor Q3 drain electrode, the metal-oxide-semiconductor Q3 source electrode ground connection.
Further, the metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4 are NMOS tube.
Further, the triode Q5 is NPN triode.
Further, the MCU chip is single-chip microcontroller.
The beneficial effects of the utility model are: circuit application lithium battery charging input protection, has input short protection,
Input reverse-connection protection, the functions such as input overvoltage protection, the circuit use MOS switch pipe, and circuit pressure drop is extremely low.There is electricity when work
The advantages such as road fever is small, circuit loss is low.
Detailed description of the invention
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar
Element or part are generally identified by similar appended drawing reference.In attached drawing, each element or part might not be according to actual ratios
It draws.
Fig. 1 is the utility model circuit diagram.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solutions of the utility model.Following embodiment is only
For clearly illustrating the technical solution of the utility model, therefore it is only used as example, and it is originally practical to cannot be used as a limitation limitation
Novel protection scope.
The anti-back flow circuit as shown in Figure 1, a kind of lithium electricity charges, including MCU chip, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4, triode Q5
And resistance R4, R5, R7, R8, R9, R10, R11, R12, R13, the PA1 foot of the MCU chip connect the one end resistance R4 and resistance
The one end R5, the resistance R4 other end ground connection, the grid of the resistance R5 other end connection metal-oxide-semiconductor Q3, the one end the resistance R7
It is connected with the one end resistance R11, the resistance R7 and the connecting pin resistance R11 are also connected with the ADC foot of MCU chip, and the resistance R7 is another
One end connects the one end resistance R8, the one end resistance R10 and positive pole DC+, the resistance R11 other end ground connection, the resistance
R8 other end connecting triode Q5 collector, the resistance R10 other end connecting triode Q5 base stage and the one end resistance R13, institute
It states triode Q5 emitter and the resistance R13 other end meets power cathode DC-, the triode Q5 collector is also connected with resistance R9
One end, the resistance R9 other end connection metal-oxide-semiconductor Q4 grid and the one end resistance R12, the metal-oxide-semiconductor Q4 source electrode and resistance R12 are another
One termination power cathode DC-, the metal-oxide-semiconductor Q4 drain electrode connection metal-oxide-semiconductor Q3 drain electrode, the metal-oxide-semiconductor Q3 source electrode ground connection.
Wherein, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4 are NMOS tube.Triode Q5 is NPN triode.MCU chip is single-chip microcontroller.
As shown in Figure 1, realization principle illustrates:
1, when not accessing power supply, the series connection bleeder circuit collection voltages value that ADC pin is formed from resistance R7, R11, ADC
Pin detects DC+ voltage lower than 4.5V, and PA1 foot exports low level, Q3 cut-off, and charging input end (DC+, DC-) pressure difference is 0V,
Input short does not damage circuit.
2, when accessing power supply, Q4 grid has positive voltage, and Q4 source electrode has negative voltage, Q4 conducting.When input voltage is excessively high,
Q5 conducting, Q4 cut-off, input disconnect；When input voltage is less than 7V, is greater than 4.5V, Q3, Q4 conducting, into charging normal shape
State.
It should be noted that the base voltage of Q5 is due to being divided by resistance R10, resistance R13, wherein resistance R10 resistance value
Greater than resistance R13, generally R10 resistance value is 5-10 times of resistance R13 resistance value, when the partial pressure value of the base stage of Q5 is greater than the base stage of Q5
When conducting voltage 0.7V, Q5 conducting.
3, when accessing reverse power connection, ADC pin detects DC+ voltage lower than 4.5V, and PA1 foot exports low level, and Q3 is cut
Only, charging input end (DC+, DC-) pressure difference is 0V, and input reverse-connection does not damage circuit.
Circuit application lithium battery charging input protection, has input short protection, input reverse-connection protection, and input over-voltage is protected
The functions such as shield, the circuit use MOS switch pipe, and circuit pressure drop is extremely low.It is excellent to have that circuit fever is small, circuit loss is low etc. when work
Point.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type, should all cover in the claim of the utility model and the range of specification.
Claims (4)
- The anti-back flow circuit 1. a kind of lithium electricity charges, it is characterised in that: including MCU chip, metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4, triode Q5 And resistance R4, R5, R7, R8, R9, R10, R11, R12, R13, the PA1 foot of the MCU chip connect the one end resistance R4 and resistance The one end R5, the resistance R4 other end ground connection, the grid of the resistance R5 other end connection metal-oxide-semiconductor Q3, the one end the resistance R7 It is connected with the one end resistance R11, the resistance R7 and the connecting pin resistance R11 are also connected with the ADC foot of MCU chip, and the resistance R7 is another One end connects the one end resistance R8, the one end resistance R10 and positive pole DC+, the resistance R11 other end ground connection, the resistance R8 other end connecting triode Q5 collector, the resistance R10 other end connecting triode Q5 base stage and the one end resistance R13, institute It states triode Q5 emitter and the resistance R13 other end meets power cathode DC-, the triode Q5 collector is also connected with resistance R9 One end, the resistance R9 other end connection metal-oxide-semiconductor Q4 grid and the one end resistance R12, the metal-oxide-semiconductor Q4 source electrode and resistance R12 are another One termination power cathode DC-, the metal-oxide-semiconductor Q4 drain electrode connection metal-oxide-semiconductor Q3 drain electrode, the metal-oxide-semiconductor Q3 source electrode ground connection.
- The anti-back flow circuit 2. a kind of lithium electricity according to claim 1 charges, it is characterised in that: the metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q4 is NMOS tube.
- The anti-back flow circuit 3. a kind of lithium electricity according to claim 1 charges, it is characterised in that: the triode Q5 is NPN Triode.
- The anti-back flow circuit 4. a kind of lithium electricity according to claim 1 charges, it is characterised in that: the MCU chip is monolithic Machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821954979.6U CN209046315U (en) | 2018-11-26 | 2018-11-26 | A kind of lithium electricity charging anti-back flow circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821954979.6U CN209046315U (en) | 2018-11-26 | 2018-11-26 | A kind of lithium electricity charging anti-back flow circuit |
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| Publication Number | Publication Date |
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| CN209046315U true CN209046315U (en) | 2019-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821954979.6U Active CN209046315U (en) | 2018-11-26 | 2018-11-26 | A kind of lithium electricity charging anti-back flow circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030047A (en) * | 2019-12-27 | 2020-04-17 | 广东高标电子科技有限公司 | Controller circuit of motor and high-voltage prevention method thereof |
-
2018
- 2018-11-26 CN CN201821954979.6U patent/CN209046315U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111030047A (en) * | 2019-12-27 | 2020-04-17 | 广东高标电子科技有限公司 | Controller circuit of motor and high-voltage prevention method thereof |
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