CN102882250A - Field charger for lithium battery of mobile phone - Google Patents
Field charger for lithium battery of mobile phone Download PDFInfo
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- CN102882250A CN102882250A CN201210341898XA CN201210341898A CN102882250A CN 102882250 A CN102882250 A CN 102882250A CN 201210341898X A CN201210341898X A CN 201210341898XA CN 201210341898 A CN201210341898 A CN 201210341898A CN 102882250 A CN102882250 A CN 102882250A
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Abstract
The invention provides a field charger for a lithium battery of a mobile phone. The field charger for the lithium battery of the mobile phone consists of a direct current power supply of 7.2 to 12V, a 4.2V voltage control circuit, a threshold reference voltage circuit, a triggering voltage circuit, a charging control and enhancement charging current circuit, a charging status indication circuit and the lithium battery, and is characterized in that a model number NE555 is adopted for a time base circuit IC1. The shapes and sizes of lithium batteries of mobile phones are diversified, and the lithium batteries can be difficultly interchanged for use. During a field activity or a travel, a user frequently encounters the condition that the lithium battery of the mobile phone is short of power, and cannot be used, and even so, a problem about call making can be well solved; and however, the problem of power shortage of the lithium battery in the field cannot be easily solved when the user answers to an incoming call or consults information stored in the mobile phone, an address book or the like. The field charger for the lithium battery of the mobile phone is designed according to the phenomenon, and the circuit of the field charger has the advantages of high practicability, high reliability, low manufacture cost and the like.
Description
Technical field
The invention belongs to electronics and battery boosting technology field, is about a kind of cellular li-ion battery outdoor charger.
Background technology
The at present use of mobile phone is very extensive, because profile, the size of cellular li-ion battery are varied, is difficult to each other Alternate.Movable or during travelling in the open air, often run into the cellular li-ion battery short of electricity and can not use, iff fortunately solving in order to call problem, if incoming call answering or when consulting in the mobile phone data such as canned data or address list, for the moment short of electricity problem is just very difficult to manage in the open air for lithium battery.The present invention has designed and produced a kind of cellular li-ion battery outdoor charger according to this phenomenon, the advantage such as that its circuit has is practical, good reliability, cost of manufacture are low.The DC power supply of this charger can be used the common rechargeable battery of 6～7 joint 1.2V, and DC power supply also can be by the cigar lighter power taking on the automobile.
Below describe cellular li-ion battery outdoor charger of the present invention related correlation technique content in implementation process in detail.
Summary of the invention
Goal of the invention and beneficial effect: because profile, the size of cellular li-ion battery are varied, be difficult to each other Alternate.Movable or during travelling in the open air, often run into the cellular li-ion battery short of electricity and can not use, iff fortunately solving in order to call problem, if incoming call answering or when consulting in the mobile phone data such as canned data or address list, for the moment short of electricity problem is just very difficult to manage in the open air for lithium battery.The present invention has designed and produced a kind of cellular li-ion battery outdoor charger according to this phenomenon, the advantage such as that its circuit has is practical, good reliability, cost of manufacture are low.The DC power supply of this charger can be used the common rechargeable battery of 6～7 joint 1.2V, and DC power supply also can be by the cigar lighter power taking on the automobile.
The operation principle of circuit: the charge power supply voltage of cellular li-ion battery is 4.2～6V, and charging current is 180～200mA.When the present invention surpasses rating number at lithium battery voltage, circuit can cut off charging process automatically, time-base circuit IC1(NE555) be used for charging and monitor the terminal voltage of lithium battery, the control voltage of time-base circuit IC1 the 5th pin provides the 4.2V reference voltage by voltage stabilizing didoe DW; The thresholding reference voltage of time-base circuit IC1 the 6th pin is set by potentiometer RP1, and time-base circuit IC1 the 2nd pin trigger voltage is then set by potentiometer RP2.After under-voltage cellular li-ion battery is connected to circuit charging output, the trigger voltage of time-base circuit IC1 the 2nd pin is lower than 1/3VCC, and the trigger in the time-base circuit IC1 is switched on, and its 3rd pin output level is uprised, the while LED is lighted luminous, and the expression lithium battery begins charging.After lithium battery was full of electricity, the terminal voltage of lithium battery increased, and makes the 2nd pin voltage of time-base circuit IC1 be higher than its trigger gate limit value, the output level step-down of time-base circuit IC1 the 3rd pin, and the lithium cell charging process stops.Time-base circuit IC1 the 6th pin thresholding reference voltage is set in 2/3VCC by potentiometer RP1.NPN transistor VT1 is used for the intensified charging electric current.
Technical scheme: cellular li-ion battery outdoor charger, it is by 7.2～12V DC power supply, 4.2V voltage control circuit, thresholding reference voltage circuit, trigger voltage circuit, charging control and intensified charging current circuit, charged state indicating circuit and lithium battery consist of, its feature comprises:
4.2V voltage control circuit: formed by voltage stabilizing didoe DW, resistance R 1 and time-base circuit IC1, the model that time-base circuit IC1 selects is NE555, the 5th pin of one termination time-base circuit IC1 of the negative pole of voltage stabilizing didoe DW and resistance R 1, the anodal VCC of the other end connection circuit of resistance R 1, the anodal connection circuit ground GND of voltage stabilizing didoe DW;
Thresholding reference voltage circuit: formed by resistance R 4, potentiometer RP1 and resistance R 5, the end of potentiometer RP1 connects the emitter of NPN transistor VT1 by resistance R 4, the other end of potentiometer RP1 is by resistance R 5 connection circuit ground GND, the 6th pin of the activity termination time-base circuit IC1 of potentiometer RP1;
The emitter of the termination NPN transistor VT1 of potentiometer RP2 in the trigger voltage circuit, an end of the activity termination capacitor C 2 of potentiometer RP2 and the 2nd pin of time-base circuit IC1, the other end connection circuit ground GND of the other end of capacitor C 2 and potentiometer RP2;
Charging control and intensified charging current circuit: formed by NPN transistor VT1 and resistance R 3, the base stage of NPN transistor VT1 connects the 3rd pin of time-base circuit IC1 by resistance R 3, the anodal VCC of the collector electrode connection circuit of NPN transistor VT1, the emitter of NPN transistor VT1 connects the positive pole of charging lead-out terminal, the negative pole connection circuit ground GND of charging lead-out terminal;
The positive pole of lithium battery links to each other with the positive pole of charging lead-out terminal, and the negative pole of lithium battery links to each other with negative pole and the circuit ground GND of charging lead-out terminal.
7.2 the positive pole of～12V DC power supply links to each other with circuit anode VCC, the negative pole of 7.2～12V DC power supply links to each other with circuit ground GND.
The charged state indicating circuit: be comprised of LED and resistance R 2, the positive pole of LED connects the 3rd pin of time-base circuit IC1 by resistance R 2, the negative pole connection circuit ground GND of LED.
Description of drawings
Accompanying drawing 1 is the embodiment circuit working schematic diagram that the invention provides a cellular li-ion battery outdoor charger.
Embodiment
According to being circuit working schematic diagram and the description of drawings of cellular li-ion battery outdoor charger shown in the accompanying drawing 1, and according to the annexation between the components and parts in the described each several part circuit of summary of the invention, and the components and parts technical parameter described in the execution mode requires to implement to realize the present invention.
The selection of components and parts and technical parameter thereof
VT1 is NPN transistor, and the model of selecting is 2SC9013;
DW is voltage stabilizing didoe, and its voltage stabilizing value parameter is 4.2V;
The resistance of resistance R 3 is 39 Ω, and power is 1W; Other resistor powers are 1/8W, and resistance R 1 resistance is 390 Ω; Resistance R 2 resistances are 680 Ω; Resistance R 4 resistances are 27k Ω; Resistance R 5 resistances are 47k Ω;
C1 is electrochemical capacitor, and its capacity is 100 μ F/25V; C2 is electric capacity, and capacity is 1000PF;
The resistance of potentiometer RP1 is 20k Ω; The resistance of potentiometer RP2 is 24k Ω;
LED is light-emitting diode, and selecting diameter is ￠ 5 red light emitting diodes;
7.2～12V DC power supply can be used 6～7 joint 1.2V rechargeable batteries, or uses the 12V batteries.
Making main points and the circuit debugging of circuit
Fairly simple because of the circuit structure of cellular li-ion battery outdoor charger, comparison is easy, as long as the components and parts performance of using is intact, the physical connection of components and parts is correct, circuit does not generally need to debug namely and can work;
In order to calibrate the final voltage of lithium cell charging, need to use 5～15V adjustable DC power supply, when the adjustable DC power supply is adjusted at 7V, and when it is received cellular li-ion battery outdoor charger dc supply input, potentiometer RP1 is transferred in the centre position, then regulator potentiometer RP2 slowly is until LED extinguishes; When the adjustable DC supply voltage transferred to 5V, LED began luminous;
Under the different battery condition of lithium battery, the operating state of LED sees the following form:
| Charging output loading condition | The frequency of IC1 the 3rd pin | The operating state of LED |
| The charging output does not connect lithium battery | About 700kHz | LED is luminous |
| When lithium battery is charging | About 4.1Hz | The LED flicker |
| When lithium battery has been full of electricity | 0?Hz | LED extinguishes |
The size of charging current is accurately controlled by resistance R 3, and the resistance of resistance R 3 is typically 39 Ω, and then charging current is about 180mA;
It is that the lithium battery of 3.7V/500mAH is tested that circuit of the present invention is selected rated value, records charging current and is about 180～200mA, and the charging interval can will be full of electric quantity of lithium battery about 2.5～3 hours;
Circuit of the present invention can use the 12V batteries as DC power supply.
Claims (2)
1. cellular li-ion battery outdoor charger, it is by 7.2～12V DC power supply, 4.2V voltage control circuit, thresholding reference voltage circuit, trigger voltage circuit, charging control and intensified charging current circuit, charged state indicating circuit and lithium battery consist of, its feature comprises:
Described 4.2V voltage control circuit is comprised of voltage stabilizing didoe DW, resistance R 1 and time-base circuit IC1, the model that time-base circuit IC1 selects is NE555, the 5th pin of one termination time-base circuit IC1 of the negative pole of voltage stabilizing didoe DW and resistance R 1, the anodal VCC of the other end connection circuit of resistance R 1, the anodal connection circuit ground GND of voltage stabilizing didoe DW;
Described thresholding reference voltage circuit is comprised of resistance R 4, potentiometer RP1 and resistance R 5, the end of potentiometer RP1 connects the emitter of NPN transistor VT1 by resistance R 4, the other end of potentiometer RP1 is by resistance R 5 connection circuit ground GND, the 6th pin of the activity termination time-base circuit IC1 of potentiometer RP1;
The emitter of the termination NPN transistor VT1 of potentiometer RP2 in the described trigger voltage circuit, an end of the activity termination capacitor C 2 of potentiometer RP2 and the 2nd pin of time-base circuit IC1, the other end connection circuit ground GND of the other end of capacitor C 2 and potentiometer RP2;
Described charging control and intensified charging current circuit are comprised of NPN transistor VT1 and resistance R 3, the base stage of NPN transistor VT1 connects the 3rd pin of time-base circuit IC1 by resistance R 3, the anodal VCC of the collector electrode connection circuit of NPN transistor VT1, the emitter of NPN transistor VT1 connects the positive pole of charging lead-out terminal, the negative pole connection circuit ground GND of charging lead-out terminal;
The positive pole of described 7.2～12V DC power supply links to each other with circuit anode VCC, and the negative pole of 7.2～12V DC power supply links to each other with circuit ground GND;
The positive pole of lithium battery links to each other with the positive pole of charging lead-out terminal, and the negative pole of lithium battery links to each other with negative pole and the circuit ground GND of charging lead-out terminal.
2. cellular li-ion battery outdoor charger according to claim 1, it is characterized in that: the charged state indicating circuit is comprised of LED and resistance R 2, the positive pole of LED connects the 3rd pin of time-base circuit IC1 by resistance R 2, the negative pole connection circuit ground GND of LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210341898XA CN102882250A (en) | 2012-09-16 | 2012-09-16 | Field charger for lithium battery of mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210341898XA CN102882250A (en) | 2012-09-16 | 2012-09-16 | Field charger for lithium battery of mobile phone |
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| Publication Number | Publication Date |
|---|---|
| CN102882250A true CN102882250A (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210341898XA Pending CN102882250A (en) | 2012-09-16 | 2012-09-16 | Field charger for lithium battery of mobile phone |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081168U (en) * | 1990-07-02 | 1991-07-17 | 高彦玲 | Emergency lantern supplied by photoelectric cell |
| CN2140582Y (en) * | 1992-10-30 | 1993-08-18 | 王宪明 | Automatic charging unit |
| US5701069A (en) * | 1993-05-24 | 1997-12-23 | Livingstones Patenter Ab | Method and device for charging lead accumulators |
-
2012
- 2012-09-16 CN CN201210341898XA patent/CN102882250A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081168U (en) * | 1990-07-02 | 1991-07-17 | 高彦玲 | Emergency lantern supplied by photoelectric cell |
| CN2140582Y (en) * | 1992-10-30 | 1993-08-18 | 王宪明 | Automatic charging unit |
| US5701069A (en) * | 1993-05-24 | 1997-12-23 | Livingstones Patenter Ab | Method and device for charging lead accumulators |
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Application publication date: 20130116 |