CN204118776U - A kind of power supply adaptor control circuit for 3G mobile terminal - Google Patents
A kind of power supply adaptor control circuit for 3G mobile terminal Download PDFInfo
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- CN204118776U CN204118776U CN201420456239.5U CN201420456239U CN204118776U CN 204118776 U CN204118776 U CN 204118776U CN 201420456239 U CN201420456239 U CN 201420456239U CN 204118776 U CN204118776 U CN 204118776U
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Abstract
The utility model provides a kind of power supply adaptor control circuit for 3G mobile terminal, comprise: protective circuit, current rectifying and wave filtering circuit, voltage comparator circuit, form with square wave circuit, the input of described protective circuit connects external AC power supply, the output of described protective circuit connects current rectifying and wave filtering circuit, the output of described current rectifying and wave filtering circuit connects described voltage comparator circuit, the output of described voltage comparator circuit connects described square wave circuit, the output of described square wave circuit is connected with constant-current source circuit, described constant-current source output is connected with the input of described voltage comparator circuit.The utility model is compared by the voltage of voltage comparator to the battery two ends of mobile terminal, when reaching set point, being ended by triode to output end current, charging process being stopped, protecting battery, extends the useful life of battery.
Description
Technical field
The utility model relates to a kind of power supply adaptor, particularly a kind of power supply adaptor control circuit for 3G mobile terminal.
Background technology
Along with the scientific and technological develop rapidly of society, one of 3G mobile terminal requisite electronic equipment of life having become people.Usually adopt power supply adaptor to the charging of 3G mobile terminal, along with the development of electronic equipment, power supply adaptor also improves constantly charging requirement, when charging is complete, power supply adaptor can not stop charging automatically, overcharges, the battery of mobile terminal is reduced to mobile phone.
Utility model content
The utility model, for the technical problem of above-mentioned existence, proposes a kind of power supply adaptor control circuit for 3G mobile terminal, controls, prevent from overcharging to charging process, extends the useful life of battery.
The technical solution of the utility model is: a kind of power supply adaptor control circuit for 3G mobile terminal, it is characterized in that, comprise protective circuit, current rectifying and wave filtering circuit, voltage comparator circuit, form with square wave circuit, the input of described protective circuit connects external AC power supply, the output of described protective circuit connects current rectifying and wave filtering circuit, the output of described current rectifying and wave filtering circuit connects described voltage comparator circuit, the output of described voltage comparator circuit connects described square wave circuit, the output of described square wave circuit is connected with constant-current source circuit, described constant-current source output is connected with the input of described voltage comparator circuit.
Further, described voltage comparator circuit comprises resistance R2, diode D1, comparator IC1, stops charging indication, the input cathode of described comparator IC1 is connected with the output head anode of current rectifying and wave filtering circuit by resistance R2, and the negative pole of described comparator is connected with the negative pole of output end of current rectifying and wave filtering circuit by diode D1.
Further, described constant-current source circuit is made up of resistance R7, diode D4, diode D5 and triode Q1, the base stage of described triode is connected in series to the output of current rectifying and wave filtering circuit by diode D4 and diode D5, the collector electrode of described triode is connected with rectification filter circuit output end by resistance R7.
Further, described circuit of output terminal arranges resistance R11 and resistance R12, and described resistance R12 is adjustable resistance, and described resistance R12 is connected with the electrode input end of described comparator.
Further, described square wave circuit comprises resistance R5, resistance R6, resistance R9, resistance R8, electric capacity C3 and square-wave generator IC2, the electrode input end of described square-wave generator IC2 is connected with the output of described comparator IC1, described electric capacity C3 is connected in parallel on the electrode input end of described square-wave generator IC2, the negative input of described square-wave generator IC2 is by resistance R6 ground connection, and the output of described square-wave generator IC2 is connected with negative input and electrode input end respectively by resistance R6, resistance R5.
The beneficial effects of the utility model: compared by the voltage of voltage comparator to the battery two ends of mobile terminal; when reaching set point, by triode, output end current is ended, charging process is stopped; battery is protected, extends the useful life of battery.
Accompanying drawing explanation
Fig. 1 is a kind of power supply adaptor control circuit figure for 3G mobile terminal that the utility model proposes.
Embodiment
See Fig. 1, be a kind of power supply adaptor control circuit figure for 3G mobile terminal that the utility model proposes.
As shown in Figure 1, a kind of power supply adaptor control circuit for 3G mobile terminal, it is characterized in that, comprise protective circuit, current rectifying and wave filtering circuit, voltage comparator circuit, form with square wave circuit, the input of described protective circuit connects external AC power supply, the output of described protective circuit connects current rectifying and wave filtering circuit, the output of described current rectifying and wave filtering circuit connects described voltage comparator circuit, the output of described voltage comparator circuit connects described square wave circuit, the output of described square wave circuit is connected with constant-current source circuit, described constant-current source output is connected with the input of described voltage comparator circuit.
Described voltage comparator circuit comprises resistance R2, diode D1, comparator IC1, stops charging indication, the input cathode of described comparator IC1 is connected with the output head anode of current rectifying and wave filtering circuit by resistance R2, and the negative pole of described comparator is connected with the negative pole of output end of current rectifying and wave filtering circuit by diode D1.
Described constant-current source circuit is made up of resistance R7, diode D4, diode D5 and triode Q1, the base stage of described triode is connected in series to the output of current rectifying and wave filtering circuit by diode D4 and diode D5, the collector electrode of described triode is connected with rectification filter circuit output end by resistance R7.
Described circuit of output terminal arranges resistance R11 and resistance R12, and described resistance R12 is adjustable resistance, and described resistance R12 is connected with the electrode input end of described comparator IC1.
Described square wave circuit comprises resistance R5, resistance R6, resistance R9, resistance R8, electric capacity C3 and square-wave generator IC2, the electrode input end of described square-wave generator IC2 is connected with the output of described comparator IC1, described electric capacity C3 is connected in parallel on the electrode input end of described square-wave generator IC2, the negative input of described square-wave generator IC2 is by resistance R6 ground connection, and the output of described square-wave generator IC2 is connected with negative input and electrode input end respectively by resistance R6, resistance R5.
Use power supply adaptor of the present utility model for 3G mobile terminal charge time, because the voltage at 3G mobile terminal two ends is very low, the output output low level of comparator, square-wave generator produces vibration, is exported by triode Q1, constant current charge is carried out to 3G mobile terminal, when charging voltage reaches predetermined value, comparator exports high level, and square-wave generator stops oscillation output high level, triode ends, and stops the charging to battery.
When the output of comparator is low level, light-emitting diode D2 conducting, prompts for charged state, when the output of comparator is high level, light-emitting diode D3 conducting, prompts for stopping charged state, can judge the operating state of power supply adaptor according to the state of light-emitting diode D2 and D3.
Claims (5)
1. the power supply adaptor control circuit for 3G mobile terminal, it is characterized in that, comprise: protective circuit, current rectifying and wave filtering circuit, voltage comparator circuit, form with square wave circuit, the input of described protective circuit connects external AC power supply, the output of described protective circuit connects current rectifying and wave filtering circuit, the output of described current rectifying and wave filtering circuit connects described voltage comparator circuit, the output of described voltage comparator circuit connects described square wave circuit, the output of described square wave circuit is connected with constant-current source circuit, described constant-current source output is connected with the input of described voltage comparator circuit.
2. a kind of power supply adaptor control circuit for 3G mobile terminal according to claim 1, it is characterized in that, described voltage comparator circuit comprises resistance R2, diode D1, comparator IC1, stops charging indication, the input cathode of described comparator IC1 is connected with the output head anode of current rectifying and wave filtering circuit by resistance R2, and the negative pole of described comparator is connected with the negative pole of output end of current rectifying and wave filtering circuit by diode D1.
3. a kind of power supply adaptor control circuit for 3G mobile terminal according to claim 1, it is characterized in that, described constant-current source circuit is made up of resistance R7, diode D4, diode D5 and triode Q1, the base stage of described triode is connected in series to the output of current rectifying and wave filtering circuit by diode D4 and diode D5, the collector electrode of described triode is connected with rectification filter circuit output end by resistance R7.
4. a kind of power supply adaptor control circuit for 3G mobile terminal according to claim 2, it is characterized in that, described circuit of output terminal arranges resistance R11 and resistance R12, and described resistance R12 is adjustable resistance, and described resistance R12 is connected with the electrode input end of described comparator IC1.
5. a kind of power supply adaptor control circuit for 3G mobile terminal according to claim 2, it is characterized in that, described square wave circuit comprises resistance R5, resistance R6, resistance R9, resistance R8, electric capacity C3 and square-wave generator IC2, the electrode input end of described square-wave generator IC2 is connected with the output of described comparator IC1, described electric capacity C3 is connected in parallel on the electrode input end of described square-wave generator IC2, the negative input of described square-wave generator IC2 is by resistance R6 ground connection, the output of described square-wave generator IC2 is by resistance R6, resistance R5 is connected with negative input and electrode input end respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420456239.5U CN204118776U (en) | 2014-08-14 | 2014-08-14 | A kind of power supply adaptor control circuit for 3G mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420456239.5U CN204118776U (en) | 2014-08-14 | 2014-08-14 | A kind of power supply adaptor control circuit for 3G mobile terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204118776U true CN204118776U (en) | 2015-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420456239.5U Expired - Fee Related CN204118776U (en) | 2014-08-14 | 2014-08-14 | A kind of power supply adaptor control circuit for 3G mobile terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204118776U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105867592A (en) * | 2016-04-18 | 2016-08-17 | 北京小米移动软件有限公司 | Method and device for managing electric quantity consumption |
-
2014
- 2014-08-14 CN CN201420456239.5U patent/CN204118776U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105867592A (en) * | 2016-04-18 | 2016-08-17 | 北京小米移动软件有限公司 | Method and device for managing electric quantity consumption |
| CN105867592B (en) * | 2016-04-18 | 2019-04-12 | 北京小米移动软件有限公司 | A kind of method and apparatus managing electric quantity consumption |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150121 Termination date: 20200814 |
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| CF01 | Termination of patent right due to non-payment of annual fee |