CN203722285U - Lithium battery charging circuit - Google Patents
Lithium battery charging circuit Download PDFInfo
- Publication number
- CN203722285U CN203722285U CN201320880935.4U CN201320880935U CN203722285U CN 203722285 U CN203722285 U CN 203722285U CN 201320880935 U CN201320880935 U CN 201320880935U CN 203722285 U CN203722285 U CN 203722285U
- Authority
- CN
- China
- Prior art keywords
- charging
- semiconductor
- oxide
- metal
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a lithium battery charging circuit including a voltage transformation circuit, a rectification filtering circuit and a charging control circuit connected with each other. The charging control circuit includes a single-chip microprocessor, a voltage comparator, a current comparator, a current matcher, a first MOS tube, a second MOS tube, a third MOS tube, a fourth MOS tube, a current limiting element, a first voltage sharing element and a second voltage sharing element. The single-chip microprocessor chooses a charging method based on voltage across two ends of a lithium battery and the method of constant-current pre-charging in the first step, constant-current charging in the second step and constant-voltage charging in the third step is adopted for charging the lithium battery. Therefore, lithium battery charging becomes safe and charging stability is improved.
Description
Technical field
The utility model relates to a kind of charging circuit of lithium battery, and this lithium battery can be used for video camera, portable sound equipment, wireless sound box, electronic equipment, intellective dust collector, GPS navigation instrument, industrial instrumentation etc.
Background technology
According to the architectural characteristic of lithium battery, high charge final voltage should be 4.2V, can not overcharge, otherwise can take away too much because of anodal lithium ion, and battery is scrapped.It discharges and recharges and has relatively high expectations, can adopt constant voltage charger to charge, so the charging of lithium battery generally adopts constant current or constant voltage charge at present, because lithium battery is put state, normal charging condition in under-voltage mistake, approached the both end voltage difference of full state, and current charging modes is not distinguished this three kinds of states, thereby make the charge stability of lithium battery not high, fail safe is not high.
Utility model content
Technical problem to be solved in the utility model is: a kind of lithium battery charging circuit is provided, this charging circuit is determined charging modes according to the real-time voltage at lithium battery two ends, adopt the mode of first constant current preliminary filling, the last constant voltage charge of rear constant current charge to charge to lithium battery, make the charging of lithium battery safer, the stability of charging improves.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of lithium battery charging circuit, comprise interconnective transforming circuit, current rectifying and wave filtering circuit and charging control circuit, this charging control circuit, comprise single-chip microcomputer, voltage comparator, current comparator, current matching device, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, current limiting element and the first sectional pressure element and the second sectional pressure element, the VCC pin of described single-chip microcomputer is connected power supply with current rectifying and wave filtering circuit positive pole, the AD1 pin of described single-chip microcomputer is connected with the charging positive terminal of lithium battery, the PA0 pin of single-chip microcomputer is connected with the electrode input end of voltage comparator, the PA1 pin of single-chip microcomputer is connected with the negative input of current comparator, the PA3 pin of single-chip microcomputer is connected charging signals indicator light with PA4 pin, the VSS pin ground connection of single-chip microcomputer, the first sectional pressure element and the second sectional pressure element are series between the charging positive terminal and charging negative pole end of lithium battery, the drain electrode of described the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 4th metal-oxide-semiconductor is all connected with the positive pole of current rectifying and wave filtering circuit, and the grid of described the first metal-oxide-semiconductor, the second metal-oxide-semiconductor interconnects and is connected with the output of current comparator, the source electrode of described the first metal-oxide-semiconductor is connected with the drain electrode of the negative input of current matching device, the 3rd metal-oxide-semiconductor, the source electrode of the second metal-oxide-semiconductor is connected with the charging positive terminal of lithium battery, the electrode input end of current matching device, described the 3rd grid of metal-oxide-semiconductor and the output of current matching device are connected, and the source electrode of the 3rd metal-oxide-semiconductor is connected with the charging negative pole end of lithium battery by current limiting element, described the 4th grid of metal-oxide-semiconductor and the output of voltage comparator are connected, the negative input of voltage comparator connects between the first sectional pressure element and the second sectional pressure element, the source electrode of the 4th metal-oxide-semiconductor connects the output of current comparator, the electrode input end of current comparator and the source electrode that is connected the 3rd metal-oxide-semiconductor.
As the preferred scheme of one, described charging control circuit also comprises voltage stabilizing circuit, and this voltage stabilizing circuit connects between VCC pin and current rectifying and wave filtering circuit.
As the preferred scheme of one, the output voltage of described single-chip microcomputer PA0 pin is 4.0 or 4.1V.
As the preferred scheme of one, the output voltage of described single-chip microcomputer PA1 pin is 0.1V or 1V, and in the time that the lithium battery both end voltage of AD1 pin detection is less than 2.9V, PA1 pin output voltage is 0.1V, in the time that AD1 pin detects lithium battery both end voltage and is greater than 2.9V and is less than 4.2V, PA1 pin output voltage is 1V.
As the preferred scheme of one, described charging signals indicator light comprises charging instruction red light and is full of instruction green light, the PA3 pin connection charging instruction red light of described single-chip microcomputer; The connection of PA4 pin is full of instruction green light.
Adopt after technique scheme, effect of the present utility model is: this charging circuit utilizes single-chip microcomputer to detect the voltage at lithium battery two ends, when lithium battery voltage is lower, for example: during lower than 2.9V, if this Single-chip Controlling lithium battery is with the constant current precharge of 0.1C, when lithium battery presses while being raised between 2.9-4.1V, Single-chip Controlling lithium battery charges under the constant current of 1C, when pressing, lithium battery is raised to 4.1 or while exceeding 4.1, this charging circuit can form LDO pressurizer, thereby give lithium battery constant voltage charge, like this, this charging circuit can improve stability and the fail safe of lithium cell charging.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the pin configuration schematic diagram of the single-chip microcomputer of the utility model embodiment;
Fig. 2 is the transforming circuit of the utility model embodiment, the circuit diagram of current rectifying and wave filtering circuit;
Fig. 3 is the circuit diagram of the charging control circuit of the utility model embodiment.
Embodiment
Below by specific embodiment, the utility model is described in further detail.
A kind of lithium battery charging circuit, comprise interconnective transforming circuit, current rectifying and wave filtering circuit and charging control circuit, as shown in Figure 2, the circuit of employing is identical with conventional at present transforming circuit and current rectifying and wave filtering circuit for this transforming circuit and current rectifying and wave filtering circuit, does not therefore just describe at this.
As shown in Figure 3, this charging control circuit, comprise single-chip microcomputer, voltage comparator, current comparator, current matching device, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, current limiting element and the first sectional pressure element and the second sectional pressure element, as shown in Figure 1, this single-chip microcomputer comprises 8 pins, the VCC pin VCC of wherein said single-chip microcomputer is connected power supply with current rectifying and wave filtering circuit positive pole, described charging control circuit also comprises voltage stabilizing circuit, and this voltage stabilizing circuit connects between VCC pin and current rectifying and wave filtering circuit.The AD1 pin AD1 of described single-chip microcomputer is connected with the charging positive terminal of lithium battery; The PA0 pin PA0 of single-chip microcomputer is connected with the electrode input end of voltage comparator; On 4 pin of single-chip microcomputer, draw, the PA1 pin PA1 of single-chip microcomputer is connected with the negative input of current comparator; The PA3 pin PA3 of single-chip microcomputer is connected charging signals indicator light with PA4 pin PA4, concrete, and described charging signals indicator light comprises charging instruction red light LED0 and is full of instruction green light, the PA3 pin PA3 connection charging instruction red light of described single-chip microcomputer; PA4 pin PA4 connection is full of instruction green light.Another utmost point ground connection of charging instruction red light LED0 and charging instruction green light; When PA3 pin PA3 controls the state of charging instruction red light LED0, export the PWM of cycle 1s during lower than 2.9V when the voltage at lithium battery two ends, duty ratio is 50%, when cell voltage exceedes 2.9V and while being less than 4.1V, output 100%PWM.PA4 pin PA4 controls the light on and off that are full of instruction green light LED1, and if only if voltage green light during higher than 4.1V.VSS pin VSS holds ground connection, normally works for single-chip microcomputer.Between VSS pin and VCC pin, can connect filter capacitor, thereby can ensure that the long-term normal power-up of single-chip microcomputer is used.
The first sectional pressure element and the second sectional pressure element are series between the charging positive terminal and charging negative pole end of lithium battery, as shown in Figure 3, the first sectional pressure element is resistance R 1, the second sectional pressure element is resistance R 2, the drain electrode of described the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, the 4th metal-oxide-semiconductor Q4 is all connected with the positive pole of current rectifying and wave filtering circuit, and the grid of described the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2 interconnects and is connected with the output of current comparator CA; The source electrode of described the first metal-oxide-semiconductor Q1 is connected with the negative input of current matching device MA, the drain electrode of the 3rd metal-oxide-semiconductor Q3; The source electrode of the second metal-oxide-semiconductor Q2 is connected with the charging positive terminal B+ of lithium battery, the electrode input end of current matching device MA; The grid of described the 3rd metal-oxide-semiconductor Q3 is connected with the output of current matching device MA, and the source electrode of the 3rd metal-oxide-semiconductor Q3 is connected with the charging negative pole end B-of lithium battery by current limiting element; This current limiting element is Rpreg, and the grid of described the 4th metal-oxide-semiconductor Q4 is connected with the output of voltage comparator VA; The negative input of voltage comparator VA connects between the first sectional pressure element R1 and the second sectional pressure element R2; The source electrode of the 4th metal-oxide-semiconductor Q4 connects the output of current comparator CA; The electrode input end of current comparator CA and the source electrode that is connected the 3rd metal-oxide-semiconductor Q3.The output voltage of described single-chip microcomputer PA0 pin is 4.0 or 4.1V.In the present embodiment, this output voltage is that the output voltage of single-chip microcomputer PA1 pin is 0.1V or 1V described in 4.1V, in the time that the lithium battery both end voltage of AD1 pin detection is less than 2.9V, PA1 pin output voltage is 0.1V, in the time that AD1 pin detects lithium battery both end voltage and is greater than 2.9V and is less than 4.2V, PA1 pin output voltage is 1V.
Operation principle of the present utility model is: when B-and B+ respectively with the negative pole of lithium battery and anodal connection while charging, the voltage detecting as AD1 pin AD1 is during lower than 2.9V, represent electric quantity of lithium battery wretched insufficiency, put under-voltage condition in crossing, now, the voltage of PA1 pin PA1 output is 0.1V, and PA0 pin PA0 constant output 4.1V, the output of voltage comparator VA output high level so, the 4th metal-oxide-semiconductor Q4 ends, now, the voltage of the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2 completely by current ratio/device CA determines; And v
cA+=V
pregflow through the electric current I of current limiting element Rpreg
preg=V
cA+/ Rpreg, so the second metal-oxide-semiconductor Q2 can utilize the multiplication factor of self to provide 1000I to lithium battery
pregconstant charging current, by selecting suitable Rpreg, making constant current charge current value is now 0.1C.When the voltage of battery is higher than 2.9V during lower than 4.1V, voltage comparator VA still exports high level, and now, the PA1 pin PA1 output voltage of single-chip microcomputer is 1V, and in like manner, the second metal-oxide-semiconductor Q2 can utilize the multiplication factor of self to provide 1000I to lithium battery
pregconstant charging current, current value is 1C; And the voltage of working as the negative pole end of voltage comparator VA approaches reference voltage (voltage of PA0 pin PA0), voltage comparator VA output end voltage declines, the 4th metal-oxide-semiconductor Q4 conducting; Now, voltage comparator VA, the 4th metal-oxide-semiconductor Q4, the second metal-oxide-semiconductor Q2, the first divider resistance R1, the second divider resistance R2 have formed a LDO pressurizer, the voltage V of output
bat=(1+R1/R2) V
ref, because the resistance of two divider resistances is certain, the voltage V of input
refnecessarily, therefore, output voltage V
batalso be certain value, like this, just can constant voltage 4.2V to lithium cell charging, the electric current of charging reduces gradually; When electric current is reduced to I
endtime, charging control circuit will be closed automatically.
This lithium battery charging circuit is by Weak current constant current preliminary filling, and then constant current charge, and the mode of last constant voltage charge is to lithium cell charging, and charge stability improves, and charges safer; Circuit cost is low, and volume is little.
Claims (5)
1. a lithium battery charging circuit, comprise interconnective transforming circuit, current rectifying and wave filtering circuit and charging control circuit, it is characterized in that: this charging control circuit comprises single-chip microcomputer, voltage comparator, current comparator, current matching device, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, current limiting element and the first sectional pressure element and the second sectional pressure element, the VCC pin of described single-chip microcomputer is connected power supply with current rectifying and wave filtering circuit is anodal, and the AD1 pin of described single-chip microcomputer is connected with the charging positive terminal of lithium battery; The PA0 pin of single-chip microcomputer is connected with the electrode input end of voltage comparator; The PA1 pin of single-chip microcomputer is connected with the negative input of current comparator; The PA3 pin of single-chip microcomputer is connected charging signals indicator light with PA4 pin, the VSS pin ground connection of single-chip microcomputer; The first sectional pressure element and the second sectional pressure element are series between the charging positive terminal and charging negative pole end of lithium battery, the drain electrode of described the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, the 4th metal-oxide-semiconductor is all connected with the positive pole of current rectifying and wave filtering circuit, and the grid of described the first metal-oxide-semiconductor, the second metal-oxide-semiconductor interconnects and is connected with the output of current comparator; The source electrode of described the first metal-oxide-semiconductor is connected with the drain electrode of the negative input of current matching device, the 3rd metal-oxide-semiconductor; The source electrode of the second metal-oxide-semiconductor is connected with the charging positive terminal of lithium battery, the electrode input end of current matching device; Described the 3rd grid of metal-oxide-semiconductor and the output of current matching device are connected, and the source electrode of the 3rd metal-oxide-semiconductor is connected with the charging negative pole end of lithium battery by current limiting element; Described the 4th grid of metal-oxide-semiconductor and the output of voltage comparator are connected; The negative input of voltage comparator connects between the first sectional pressure element and the second sectional pressure element; The source electrode of the 4th metal-oxide-semiconductor connects the output of current comparator; The electrode input end of current comparator and the source electrode that is connected the 3rd metal-oxide-semiconductor.
2. a kind of lithium battery charging circuit as claimed in claim 1, is characterized in that: described charging control circuit also comprises voltage stabilizing circuit, and this voltage stabilizing circuit connects between the VCC pin and current rectifying and wave filtering circuit of single-chip microcomputer.
3. a kind of lithium battery charging circuit as claimed in claim 2, is characterized in that: the output voltage of described single-chip microcomputer PA0 pin is 4.0 or 4.1V.
4. a kind of lithium battery charging circuit as claimed in claim 3, it is characterized in that: the output voltage of described single-chip microcomputer PA1 pin is 0.1V or 1V, in the time that the lithium battery both end voltage of AD1 pin detection is less than 2.9V, PA1 pin output voltage is 0.1V, in the time that AD1 pin detects lithium battery both end voltage and is greater than 2.9V and is less than 4.2V, PA1 pin output voltage is 1V.
5. a kind of lithium battery charging circuit as claimed in claim 4, is characterized in that: described charging signals indicator light comprises charging instruction red light and is full of instruction green light, the PA3 pin connection charging instruction red light of described single-chip microcomputer; The connection of PA4 pin is full of instruction green light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320880935.4U CN203722285U (en) | 2013-12-30 | 2013-12-30 | Lithium battery charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320880935.4U CN203722285U (en) | 2013-12-30 | 2013-12-30 | Lithium battery charging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203722285U true CN203722285U (en) | 2014-07-16 |
Family
ID=51161410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320880935.4U Expired - Fee Related CN203722285U (en) | 2013-12-30 | 2013-12-30 | Lithium battery charging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203722285U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106162483A (en) * | 2015-03-12 | 2016-11-23 | 中国人民解放军装甲兵工程学院 | A kind of tank radio set audio accessory detection device |
-
2013
- 2013-12-30 CN CN201320880935.4U patent/CN203722285U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106162483A (en) * | 2015-03-12 | 2016-11-23 | 中国人民解放军装甲兵工程学院 | A kind of tank radio set audio accessory detection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102832669B (en) | Intelligent charge-discharge control circuit of battery | |
| CN104348192B (en) | A kind of electronic cigarette USB charger | |
| CN102882260B (en) | Lithium battery charging control method with temperature detection function and charger for implementing lithium battery charging control method | |
| CN204216600U (en) | Synchronization lifting piezoelectric battery charging device | |
| CN205565836U (en) | Emergent start power device | |
| CN104267350B (en) | Automatic storage battery charging-discharging detection device | |
| CN203056644U (en) | Intelligent charge-discharge control circuit of battery | |
| CN106515473A (en) | Intelligent charging system based on microcontroller for batteries of electric vehicles and control method thereof | |
| CN203289168U (en) | Charger circuit for lead-acid battery | |
| CN105896687B (en) | Intelligent charger based on PWM double-closed-loop controls | |
| CN203481855U (en) | Portable power supply device | |
| CN203722285U (en) | Lithium battery charging circuit | |
| CN204669009U (en) | A kind of electric-vehicle-mounted lithium battery charging system | |
| CN204144993U (en) | A kind of electric automobile lithium battery charge balancing control circuit | |
| CN103956531B (en) | Lead acid accumulator super-large current spike charge control method | |
| CN206254814U (en) | SCM Based batteries of electric automobile intelligent charging system | |
| CN105375586A (en) | Battery charge and discharge management device and metering instrument manufactured by the same | |
| CN202149911U (en) | Power supply circuit of external battery for intelligent three-phase charge control electric meter | |
| CN205643632U (en) | Battery simulating circuit | |
| CN204142931U (en) | A kind of accumulator auto charge and discharge and capacity checking apparatus | |
| CN204835678U (en) | Charging system | |
| CN107579560A (en) | A kind of accumulator charging and discharging state detection and monitoring system | |
| CN202930977U (en) | Lithium battery charger with temperature detection | |
| CN107895992A (en) | A kind of solar storage battery charge-discharge monitoring system | |
| CN103280850A (en) | Drive circuit with charger baby and multipurpose LED (light-emitting diode) functions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 215611 Jiangsu Province, Zhangjiagang City Tangqiao Zhen Heng Jing Cun Guang Ming Lu Jiangsu new energy Polytron Technologies Inc Saul Patentee after: JIANGSU SOUL NEW ENERGY TECHNOLOGY CO., LTD. Address before: Suzhou City, Jiangsu province 215611 Zhangjiagang City Tangqiao town Henjing village Jiangsu Guangming Road Saul Amperex Technology Limited Patentee before: Jiangsu Suoer New Energy Technology Co., Ltd. |
|
| 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: 20140716 Termination date: 20201230 |