CN203871878U - Computer USB port constant-current charger for cellphone lithium battery - Google Patents
Computer USB port constant-current charger for cellphone lithium battery Download PDFInfo
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- CN203871878U CN203871878U CN201420104756.6U CN201420104756U CN203871878U CN 203871878 U CN203871878 U CN 203871878U CN 201420104756 U CN201420104756 U CN 201420104756U CN 203871878 U CN203871878 U CN 203871878U
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Abstract
The utility model relates to a computer USB port constant-current charger for a cellphone lithium battery. The charger is characterized by comprising a computer USB port, a constant current source circuit, a field effect transistor power driver and charging interface circuit, a lithium battery full-charge indicator circuit. The constant current source circuit is formed by a three-terminal adjustable shunting reference voltage source IC1, a resistor R1, a resistor R2, and a resistor R3. The selected model of the IC1 is TL431. In the field effect transistor power driver and charging interface circuit, the gate electrode of an enhanced N-channel field effect transistor VT1 is connected to the cathode of the IC1; the source electrode of the VT1 is connected to a ground terminal GND of the circuit; the drain electrode of the VT1 is connected to the negative electrode of a charging terminal of a lithium battery; and the positive electrode of the charging terminal of the lithium battery is connected to the positive electrode of the circuit VCC. When the lithium battery is fully charged, the indicator circuit gives a prompt, and thus the circuit is very practical.
Description
Technical field
The utility model belongs to cellular li-ion battery charging technique field, is about a kind of computer USB mouth cellular li-ion battery constant current charger.
Background technology
The use of mobile phone is at present very extensive, and the problem that particularly smart mobile phone power consumption is large is perplexing everybody always.The lithium battery that smart mobile phone is joined is thousands of MAHs easily, are that it charges three, four hours at least with common charger, seven, eight hours at most.When running into cellular li-ion battery short of electricity and can not using, charging needs again for a long time, and this brings very burden to cellie.In order to solve cellular li-ion battery quick charge problem, the utility model has designed and produced a kind of computer USB mouth cellular li-ion battery constant current charger, this charger obtains 5V DC power supply as charger working power from computer USB mouth, after being full of, reminded by indicating circuit cellular li-ion battery electric weight, its circuit has good practicality, and has the advantages such as good reliability, cost of manufacture be low.
Below describe computer USB mouth cellular li-ion battery constant current charger described in the utility model related correlation technique content in implementation process in detail.
Utility model content
Goal of the invention and beneficial effect: the use of mobile phone is at present very extensive, and the problem that particularly smart mobile phone power consumption is large is perplexing everybody always.The lithium battery that smart mobile phone is joined is thousands of MAHs easily, are that it charges three, four hours at least with common charger, seven, eight hours at most.When running into cellular li-ion battery short of electricity and can not using, charging needs again for a long time, and this brings very burden to cellie.In order to solve cellular li-ion battery quick charge problem, the utility model has designed and produced a kind of computer USB mouth cellular li-ion battery constant current charger, this charger obtains 5V DC power supply as charger working power from computer USB mouth, after being full of, reminded by indicating circuit cellular li-ion battery electric weight, its circuit has good practicality, and has the advantages such as good reliability, cost of manufacture be low.
Circuit working principle: computer USB mouth cellular li-ion battery constant current charger is by three end adjustable shunt reference voltage source IC1(TL431) provide control voltage for the grid of enhancement mode N channel field-effect pipe VT1, under the 5V DC power supply providing at computer USB mouth is supported, the 1A constant current value that charges, by drain electrode and the cellular li-ion battery composition quick charge loop of enhancement mode N channel field-effect pipe VT1.
In quick charge loop, be connected to 4.15V voltage detecting circuit, in the time that on charge circuit, lithium battery terminal voltage reaches 4.15V, the 1st pin output high level of the micro-power consumption voltage detector of three ends IC, now high level is lighted red light emitting diodes LED by resistance R 6, and this electric weight that shows cellular li-ion battery is full of.
Technical scheme: computer USB mouth cellular li-ion battery constant current charger, it comprises that computer USB mouth, constant-current source circuit, field effect transistor power drive and charging inlet circuit, electric quantity of lithium battery are full of indicating circuit, is characterized in that:
Constant-current source circuit: it is made up of three end adjustable shunt reference voltage source IC1, resistance R 1, resistance R 2 and resistance R 3, the model that three end adjustable shunt reference voltage source IC1 select is TL431, one end of negative electrode connecting resistance R1 of three end adjustable shunt reference voltage source IC1 and one end of resistance R 2, the anodal VCC of other end connection circuit of resistance R 1, the reference utmost point of one termination three end adjustable shunt reference voltage source IC1 of the other end of resistance R 2 and resistance R 3, the anode connection circuit ground GND of the other end of resistance R 3 and three end adjustable shunt reference voltage source IC1;
Field effect transistor power drive and charging inlet circuit: the grid of enhancement mode N channel field-effect pipe VT1 connects the negative electrode of three end adjustable shunt reference voltage source IC1, the source electrode connection circuit ground GND of enhancement mode N channel field-effect pipe VT1, the anodal VCC of anodal connection circuit of lithium cell charging terminal, the negative pole of lithium cell charging terminal connects the drain electrode of enhancement mode N channel field-effect pipe VT1;
The anodal VCC of anodal connection circuit of computer USB mouth, the negative pole connection circuit ground GND of computer USB mouth.
Electric quantity of lithium battery is full of indicating circuit: it is by the micro-power consumption voltage detector of three ends IC2, resistance R 4, resistance R 5, resistance R 6 and red light emitting diodes LED composition, the magnitude of voltage that the micro-power consumption voltage detector of three ends IC2 selects is 4.15V, the 2nd pin of the micro-power consumption voltage detector of the one termination three end IC2 of one end of resistance R 4 and resistance R 5, the anodal VCC of other end connection circuit of resistance R 4, the 3rd pin of the other end of resistance R 5 and the micro-power consumption voltage detector of three ends IC2 connects the drain electrode of enhancement mode N channel field-effect pipe VT1, the 1st pin of the micro-power consumption voltage detector of three ends IC2 connects the positive pole of red light emitting diodes LED by resistance R 6, the negative pole of red light emitting diodes LED connects the drain electrode of enhancement mode N channel field-effect pipe VT1.
Brief description of the drawings
Accompanying drawing 1 is the embodiment circuit working schematic diagram that the utility model provides a computer USB mouth cellular li-ion battery constant current charger.
Embodiment
According to computer USB mouth cellular li-ion battery constant current charger circuit working schematic diagram and brief description of the drawings shown in accompanying drawing 1, and according to annexation between components and parts in the each several part circuit described in utility model content, and the components and parts technical parameter described in execution mode requires and circuit production main points are implemented to realize the utility model, below in conjunction with embodiment, correlation technique of the present utility model is further described.
The technical parameter of components and parts and selection requirement
IC1 is three end adjustable shunt reference voltage sources, and the model of selecting is TL431, packing forms T0-92, and 3 pins are respectively reference edge, positive terminal and negative pole end; The output voltage of positive terminal and negative pole end is adjustable continuously between 2.5～36V, and current margin is 0.1～100mA;
The available universal instrument R × 1K of the quality Ω shelves of TL431 performance are measured, that is: red test pencil connects anode, and black meter pen connects negative electrode, and it is infinitely great that resistance should be, and exchanging test pencil measurement should be at several kilohm; Red test pencil connects with reference to the utmost point, and black meter pen connects negative electrode, and resistance should be infinitely great ∞, exchange test pencil after measured value should be at several kilohms; Red test pencil connects with reference to the utmost point, and black meter pen connects anode, and resistance should be about 30K Ω, exchanges test pencil measurements and should be about 20K Ω, if it is very little or be zero to measure between certain bipod resistance, shows TL431 punch through damage;
IC2 is the micro-power consumption voltage detector of three ends, and the voltage detecting value of selecting is 4.15V, and packing forms is T0-92;
VT1 is enhancement mode N channel field-effect pipe, the model of selecting is IRFZ22 or IRFZ30, packing forms is TO-220, the field effect transistor of these two kinds of models is under conducting state, between the source electrode of field effect transistor and drain electrode, pressure drop is very little, substantially negligible, when use, need to install small heat-dissipating device additional;
LED is red light emitting diodes, selects diameter ￠ 5 red light emitting diodes;
Resistance is all selected metalfilmresistor, and power is 1/8W, and the resistance of resistance R 1 is 250 Ω, the resistance of resistance R 2 is 8.2K Ω, and the resistance of resistance R 3 is about 10K Ω, and the resistance of resistance R 4 is 220～390 Ω, the resistance of resistance R 5 is 3.3K Ω, and the resistance of resistance R 6 is 270 Ω.
Making main points and the circuit debugging of circuit
Because of the circuit structure of computer USB mouth cellular li-ion battery constant current charger fairly simple, comparison is easy, as long as the electronic devices and components performance of generally selecting is intact, and the components and parts annexation in accompanying drawing 1 is welded to specifications, physical connection line and welding quality are after careful inspection is correct, and circuit of the present utility model does not substantially need to carry out any debugging and can normally work;
Suggestion is installed a small heat-dissipating device additional for enhancement mode N channel field-effect pipe VT1;
The resistance of adjusting resistance R2, is 1000mA at charging constant current value, and the grid of enhancement mode N channel field-effect pipe VT1 is about circuit ground GND voltage reference value: 3.9V;
The utility model uses the lithium battery that rated value is 3.7V/1000mAH to test, and charging constant current value is 1000mA, and the time that lithium battery is full of electric weight is about 1.3～1.4 hours, and the terminal voltage that the lithium battery of 3.7V/1000mAH is full of electric weight is 4.2V.
Claims (2)
1. a computer USB mouth cellular li-ion battery constant current charger, it comprises that computer USB mouth, constant-current source circuit, field effect transistor power drive and charging inlet circuit, electric quantity of lithium battery are full of indicating circuit, is characterized in that:
Described constant-current source circuit is made up of three end adjustable shunt reference voltage source IC1, resistance R 1, resistance R 2 and resistance R 3, the model that three end adjustable shunt reference voltage source IC1 select is TL431, one end of negative electrode connecting resistance R1 of three end adjustable shunt reference voltage source IC1 and one end of resistance R 2, the anodal VCC of other end connection circuit of resistance R 1, the reference utmost point of one termination three end adjustable shunt reference voltage source IC1 of the other end of resistance R 2 and resistance R 3, the anode connection circuit ground GND of the other end of resistance R 3 and three end adjustable shunt reference voltage source IC1;
In described field effect transistor power drive and charging inlet circuit, the grid of enhancement mode N channel field-effect pipe VT1 connects the negative electrode of three end adjustable shunt reference voltage source IC1, the source electrode connection circuit ground GND of enhancement mode N channel field-effect pipe VT1, the anodal VCC of anodal connection circuit of lithium cell charging terminal, the negative pole of lithium cell charging terminal connects the drain electrode of enhancement mode N channel field-effect pipe VT1;
The anodal VCC of anodal connection circuit of described computer USB mouth, the negative pole connection circuit ground GND of computer USB mouth.
2. computer USB mouth cellular li-ion battery constant current charger according to claim 1, it is characterized in that: electric quantity of lithium battery is full of indicating circuit by the micro-power consumption voltage detector of three ends IC2, resistance R 4, resistance R 5, resistance R 6 and red light emitting diodes LED composition, the magnitude of voltage that the micro-power consumption voltage detector of three ends IC2 selects is 4.15V, the 2nd pin of the micro-power consumption voltage detector of the one termination three end IC2 of one end of resistance R 4 and resistance R 5, the anodal VCC of other end connection circuit of resistance R 4, the 3rd pin of the other end of resistance R 5 and the micro-power consumption voltage detector of three ends IC2 connects the drain electrode of enhancement mode N channel field-effect pipe VT1, the 1st pin of the micro-power consumption voltage detector of three ends IC2 connects the positive pole of red light emitting diodes LED by resistance R 6, the negative pole of red light emitting diodes LED connects the drain electrode of enhancement mode N channel field-effect pipe VT1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420104756.6U CN203871878U (en) | 2014-03-09 | 2014-03-09 | Computer USB port constant-current charger for cellphone lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420104756.6U CN203871878U (en) | 2014-03-09 | 2014-03-09 | Computer USB port constant-current charger for cellphone lithium battery |
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| Publication Number | Publication Date |
|---|---|
| CN203871878U true CN203871878U (en) | 2014-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420104756.6U Expired - Fee Related CN203871878U (en) | 2014-03-09 | 2014-03-09 | Computer USB port constant-current charger for cellphone lithium battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795129A (en) * | 2014-03-09 | 2014-05-14 | 吴建堂 | Computer universal serial bus (USB) port mobile phone lithium battery constant current charger |
-
2014
- 2014-03-09 CN CN201420104756.6U patent/CN203871878U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103795129A (en) * | 2014-03-09 | 2014-05-14 | 吴建堂 | Computer universal serial bus (USB) port mobile phone lithium battery constant current charger |
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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: 20141008 Termination date: 20150309 |
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| EXPY | Termination of patent right or utility model |