CN204794042U - Overvoltage crowbar of lithium cell constant current quick charge - Google Patents
Overvoltage crowbar of lithium cell constant current quick charge Download PDFInfo
- Publication number
- CN204794042U CN204794042U CN201520430761.0U CN201520430761U CN204794042U CN 204794042 U CN204794042 U CN 204794042U CN 201520430761 U CN201520430761 U CN 201520430761U CN 204794042 U CN204794042 U CN 204794042U
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- resistance
- triode
- overvoltage crowbar
- constant
- circuit
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Abstract
The utility model provides an overvoltage crowbar of lithium cell constant current quick charge, include: reverse voltage protection circuit, overvoltage crowbar, constant -current source circuit and filter circuit, the dc supply circuit is connected to the input of reverse voltage protection circuit, overvoltage crowbar is connected to the output of reverse voltage protection circuit, the constant -current source circuit is connected to overvoltage crowbar's output, filter circuit is connected to the output of constant -current source circuit, the interface that charges of lithium cell is connected to filter circuit's output. The utility model discloses a setting up overvoltage crowbar and protecting lithium batteries, prevent that charging voltage is too high to cause the damage to the lithium cell, it be lithium batteries to trun into the dc supply of input to constant current source through the constant -current source circuit, the life of extension lithium cell, and improvement charge efficiency prevents the too big electronic equipment's of causing of output current damage.
Description
Technical field
The utility model relates to a kind of charge protector, the overvoltage crowbar of particularly a kind of lithium battery constant current quick charge.
Background technology
At present, mobile electronic product many employings lithium battery power supply, as smart mobile phone, panel computer etc.Due to properties of product from strength to strength, function gets more and more, and must bring weakening of the increase of power consumption and battery durable ability.Such as, smart mobile phone not only can be made a phone call, be sent short messages, and can also surf the Net, plays games, see a film.The increase of mobile electronic product oneself power consumption and the increase of battery capacity, all have higher requirement to lithium cell charging.Such as, the lithium battery of 1000mAh, if adopt 500mA charging circuit to charge, just can be full of for about 2 hours.If select the battery of 3000mAh in order to the flying power improving product, but still adopt 500mA charging circuit to charge, then need the time of more than 6 hour battery could be full of.In order to shorten the charging interval, charging current must be improved.And the raising of charging current, the power consumption of charging chip can be increased, cause the system failure.
Utility model content
The utility model, for the technical problem of above-mentioned existence, proposes a kind of overvoltage crowbar of lithium battery constant current quick charge, improves the reliability of lithium cell charging.
The technical solution of the utility model is: a kind of overvoltage crowbar of lithium battery constant current quick charge; comprise: reverse voltage protective circuit, overvoltage crowbar, constant-current source circuit and filter circuit; the input of described reverse voltage protective circuit connects direct current supply line; the output of described reverse voltage protective circuit connects overvoltage crowbar; the output of described overvoltage crowbar connects constant-current source circuit; the output of described constant-current source circuit connects filter circuit, and the output of described filter circuit connects the charging inlet of lithium battery.
Further, described reverse voltage protective circuit is single-phase diode D1, and described single-phase diode D1 is connected on the positive terminal of direct current supply line.
Further, described overvoltage crowbar is by resistance R1, resistance R3, resistance R4, voltage-stabiliser tube D2, insulation bank tube Q1 and triode V1 forms, one end of described resistance R3 connects the negative pole of single-phase diode D1, the other end of described resistance R3 connects the negative pole of voltage-stabiliser tube D2, the positive terminal ground connection of described voltage-stabiliser tube D2, the base stage of described triode V1 is connected with the negative pole end of voltage-stabiliser tube D2, the collector electrode of described triode V1 is connected with the positive pole of direct current supply line by resistance R4, the emitter of described triode V1 is by resistance R1 ground connection, the base stage of described insulation bank tube Q1 is connected with the collector electrode of described triode V1, the collector electrode of described insulation bank tube Q1 is connected with the negative pole of single-phase diode D1, the emitter of described insulation bank tube Q1 is connected with constant-current source circuit.
Further, described constant-current source circuit is made up of resistance R2, resistance R5, resistance R6, resistance R7, triode V2 and triode V3, the collector electrode of described triode V2 is connected with the negative pole of single-phase diode D1, the base stage of described triode V2 is connected with the negative pole of single-phase diode D1 with resistance R6 by resistance R5, the emitter of described triode V2 is by resistance R2 ground connection, the collector electrode of described triode V3 is connected with the emitter of triode V2 by resistance R7, and the emitter of described triode V3 is connected with output filter circuit.
The beneficial effects of the utility model: lithium cell charging is protected by arranging overvoltage crowbar; prevent that charging voltage is too high causes damage to lithium battery; transferring the direct current supply of input to constant-current source by constant-current source circuit is lithium cell charging; extend the useful life of lithium battery; improve charge efficiency, prevent the excessive damage causing electronic equipment of output current.
Accompanying drawing explanation
Fig. 1 is the overvoltage crowbar figure of a kind of lithium battery constant current quick charge that the utility model proposes.
Embodiment
See Fig. 1, be the overvoltage crowbar figure of a kind of lithium battery constant current quick charge that the utility model proposes.
As shown in Figure 1; a kind of overvoltage crowbar of lithium battery constant current quick charge; comprise: reverse voltage protective circuit, overvoltage crowbar, constant-current source circuit and filter circuit; the input of described reverse voltage protective circuit connects direct current supply line; the output of described reverse voltage protective circuit connects overvoltage crowbar; the output of described overvoltage crowbar connects constant-current source circuit; the output of described constant-current source circuit connects filter circuit, and the output of described filter circuit connects the charging inlet of lithium battery.
Further, described reverse voltage protective circuit is single-phase diode D1, and described single-phase diode D1 is connected on the positive terminal of direct current supply line.
Further, described overvoltage crowbar is by resistance R1, resistance R3, resistance R4, voltage-stabiliser tube D2, insulation bank tube Q1 and triode V1 forms, one end of described resistance R3 connects the negative pole of single-phase diode D1, the other end of described resistance R3 connects the negative pole of voltage-stabiliser tube D2, the positive terminal ground connection of described voltage-stabiliser tube D2, the base stage of described triode V1 is connected with the negative pole end of voltage-stabiliser tube D2, the collector electrode of described triode V1 is connected with the positive pole of direct current supply line by resistance R4, the emitter of described triode V1 is by resistance R1 ground connection, the base stage of described insulation bank tube Q1 is connected with the collector electrode of described triode V1, the collector electrode of described insulation bank tube Q1 is connected with the negative pole of single-phase diode D1, the emitter of described insulation bank tube Q1 is connected with constant-current source circuit.
Further, described constant-current source circuit is made up of resistance R2, resistance R5, resistance R6, resistance R7, triode V2 and triode V3, the collector electrode of described triode V2 is connected with the negative pole of single-phase diode D1, the base stage of described triode V2 is connected with the negative pole of single-phase diode D1 with resistance R6 by resistance R5, the emitter of described triode V2 is by resistance R2 ground connection, the collector electrode of described triode V3 is connected with the emitter of triode V2 by resistance R7, and the emitter of described triode V3 is connected with output filter circuit.
In the utility model embodiment, carry out quick charge by overvoltage protection and constant current output to lithium battery, improve charging reliability and the rapidity of lithium battery, output filter circuit adopts electric capacity C1 to be connected with constant-current source circuit output with electric capacity C2 parallel connection.
In overvoltage crowbar, the voltage-stabiliser tube D2 just ON operation when input voltage exceedes voltage-stabiliser tube D2 voltage.When input voltage VCC is lower than voltage-stabiliser tube D2 operating voltage, voltage-stabiliser tube D2 does not work, and triode V1 base stage there is not electric current to flow through, triode V1 is operated in cut-off region, grid and the drain electrode of field effect transistor Q1 do not have voltage difference, and field effect transistor Q1 is operated in saturation region, and electric current normally flows through; When input voltage VCC is higher than pressure pipe operating voltage, D3 pressure pipe works, and triode V1 base current flows through, and triode V1 is operated in cut-off region, and grid and the drain electrode coating-forming voltage of field effect transistor Q1 are poor, and field effect transistor Q1 is operated in pinch off region, and electric current can not flow through.
Constant-current source circuit is by triode V3 and resistance R5, R7, R2 forms main circuit, the upper offset resistance of triode V3 base stage is formed after resistance R2 connects with resistance R7, owing to having current flowing in base stage, just have collector current in triode V3 to flow through, voltage drop can be produced at resistance R5 two ends after emitter current flows through resistance R5, when the voltage drop at R5 two ends reaches 0.6V, V2 can conducting thereupon, the collector current of V2 flows through R2. and forms shunting to the base current of triode V1, the base current of triode V1 can reduce thereupon, collector current also reduces thereupon, therefore restriction can be produced to the base current of triode V1 after triode V2 conducting, make the outputting current steadily of circuit in some current values, the size of continuous current is determined by the resistance value of R5 and the Vbe of V2.
The beneficial effects of the utility model: lithium cell charging is protected by arranging overvoltage crowbar; prevent that charging voltage is too high causes damage to lithium battery; transferring the direct current supply of input to constant-current source by constant-current source circuit is lithium cell charging; extend the useful life of lithium battery; improve charge efficiency, prevent the excessive damage causing electronic equipment of output current.
Above the utility model is described in detail, but the utility model is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from the utility model aim.Do not depart from design of the present utility model and scope can make many other and change and remodeling.Should be appreciated that the utility model is not limited to specific execution mode, scope of the present utility model is defined by the following claims.
Claims (4)
1. the overvoltage crowbar of a lithium battery constant current quick charge; it is characterized in that; comprise: reverse voltage protective circuit, overvoltage crowbar, constant-current source circuit and filter circuit; the input of described reverse voltage protective circuit connects direct current supply line; the output of described reverse voltage protective circuit connects overvoltage crowbar; the output of described overvoltage crowbar connects constant-current source circuit; the output of described constant-current source circuit connects filter circuit, and the output of described filter circuit connects the charging inlet of lithium battery.
2. the overvoltage crowbar of a kind of lithium battery constant current quick charge according to claim 1, it is characterized in that, described reverse voltage protective circuit is single-phase diode D1, and described single-phase diode D1 is connected on the positive terminal of direct current supply line.
3. the overvoltage crowbar of a kind of lithium battery constant current quick charge according to claim 1, it is characterized in that, described overvoltage crowbar is by resistance R1, resistance R3, resistance R4, voltage-stabiliser tube D2, insulation bank tube Q1 and triode V1 forms, one end of described resistance R3 connects the negative pole of single-phase diode D1, the other end of described resistance R3 connects the negative pole of voltage-stabiliser tube D2, the positive terminal ground connection of described voltage-stabiliser tube D2, the base stage of described triode V1 is connected with the negative pole end of voltage-stabiliser tube D2, the collector electrode of described triode V1 is connected with the positive pole of direct current supply line by resistance R4, the emitter of described triode V1 is by resistance R1 ground connection, the base stage of described insulation bank tube Q1 is connected with the collector electrode of described triode V1, the collector electrode of described insulation bank tube Q1 is connected with the negative pole of single-phase diode D1, the emitter of described insulation bank tube Q1 is connected with constant-current source circuit.
4. the overvoltage crowbar of a kind of lithium battery constant current quick charge according to claim 1, it is characterized in that, described constant-current source circuit is by resistance R2, resistance R5, resistance R6, resistance R7, triode V2 and triode V3 forms, the collector electrode of described triode V2 is connected with the negative pole of single-phase diode D1, the base stage of described triode V2 is connected with the negative pole of single-phase diode D1 with resistance R6 by resistance R5, the emitter of described triode V2 is by resistance R2 ground connection, the collector electrode of described triode V3 is connected with the emitter of triode V2 by resistance R7, the emitter of described triode V3 is connected with output filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520430761.0U CN204794042U (en) | 2015-06-19 | 2015-06-19 | Overvoltage crowbar of lithium cell constant current quick charge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520430761.0U CN204794042U (en) | 2015-06-19 | 2015-06-19 | Overvoltage crowbar of lithium cell constant current quick charge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204794042U true CN204794042U (en) | 2015-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520430761.0U Expired - Fee Related CN204794042U (en) | 2015-06-19 | 2015-06-19 | Overvoltage crowbar of lithium cell constant current quick charge |
Country Status (1)
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| CN (1) | CN204794042U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108851303A (en) * | 2018-06-07 | 2018-11-23 | 东莞市民兴电缆有限公司 | A kind of belt for portable electronic device charging |
-
2015
- 2015-06-19 CN CN201520430761.0U patent/CN204794042U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108851303A (en) * | 2018-06-07 | 2018-11-23 | 东莞市民兴电缆有限公司 | A kind of belt for portable electronic device charging |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20160619 |