CN101741124A - Battery charging circuit and power supply device - Google Patents
Battery charging circuit and power supply device Download PDFInfo
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- CN101741124A CN101741124A CN201010102706A CN201010102706A CN101741124A CN 101741124 A CN101741124 A CN 101741124A CN 201010102706 A CN201010102706 A CN 201010102706A CN 201010102706 A CN201010102706 A CN 201010102706A CN 101741124 A CN101741124 A CN 101741124A
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- 238000007600 charging Methods 0.000 title claims abstract description 141
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 28
- 230000005669 field effect Effects 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000003044 adaptive effect Effects 0.000 abstract 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 8
- 229910001416 lithium ion Inorganic materials 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000005685 electric field effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention is suitable for the field of batteries, which provides a battery charging circuit and a power supply device. The circuit comprises a switch module and a charging control module, wherein the input end of the switch module is connected with the output end of a power supply, and the output end of the switch module is connected with the input end of a battery; the charging control end of the charging control module is connected to the control end of the switch module, and an output control signal controls the conduction of the switch module; the battery voltage detection end of the charging control module is connected to the input end of the battery, and the charging control module detects battery voltage; and the current regulation end of the charging control module is connected to the input end of the switch module, and charging current is regulated according to the magnitude of the battery voltage detected by the battery voltage detection end. The invention detects the voltage of the battery and carries out adaptive regulation on the charging current of the battery according to the magnitude of the detected battery voltage, so that the battery is effectively charged at different voltage stages, the service life of the battery is prolonged, the circuit is simple and reliable, and the cost is saved.
Description
Technical Field
The invention belongs to the field of batteries, and particularly relates to a battery charging circuit and a power supply device.
Background
The lithium ion battery is widely applied as a novel electric energy storage medium, and has the characteristics of high energy density, high output voltage, small self-discharge, no memory effect, long cycle life and the like. Lithium ion battery has been applied to each field, various lithium ion battery charging circuits have appeared thereupon, wherein it is more common as the circuit that intelligent control charges with switching power supply, because its design is simple, convenient nimble, the technology is mature and is widely adopted, but this circuit output voltage's precision is not high, and charging current can not carry out automatic adjustment according to lithium ion battery voltage's height, thereby can lead to lithium ion battery to fill not fully charged or overcharging, cause the injury to the battery, influence the life of battery, bring very big inconvenience for the user.
Disclosure of Invention
The embodiment of the invention aims to provide a battery charging circuit, and aims to solve the problem that the charging current in the existing battery charging circuit cannot be adjusted according to the voltage of a battery, so that the battery is not fully charged or is overcharged, and the battery is damaged.
The embodiment of the present invention is implemented as follows, a battery charging circuit for charging a battery by a power supply, the circuit comprising: the charging control system comprises a switch module and a charging control module;
the input end of the switch module is connected with the output end of the power supply, and the output end of the switch module is connected with the input end of the battery;
the charging control end of the charging control module is connected to the control end of the switch module, and outputs a control signal to control the switch module to be conducted;
the battery voltage detection end of the charging control module is connected to the input end of the battery to detect the voltage of the battery;
and the current regulating end of the charging control module is connected to the input end of the switch module, and the charging current is regulated according to the battery voltage detected by the battery voltage detecting end.
Another objective of the embodiments of the present invention is to provide a power supply device including the above battery charging circuit.
In the battery charging circuit provided by the embodiment of the invention, the voltage of the battery is detected through the battery voltage detection end of the charging control module, and the current regulation end of the charging control module adaptively regulates the charging current of the battery according to the detected voltage of the battery, so that the battery is effectively charged at different voltage stages, the service life of the battery is prolonged, the circuit is simple and reliable, and the cost is saved.
Drawings
Fig. 1 is a schematic structural diagram of a battery charging circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a battery charging circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention detects the voltage of the battery, and adaptively adjusts the charging current of the battery according to the detected voltage of the battery, so that the battery is effectively charged at different voltage stages.
Fig. 1 illustrates a structural principle of a battery charging circuit provided by an embodiment of the present invention, and for convenience of explanation, only a part related to the embodiment of the present invention is illustrated.
The battery charging circuit is widely applied to various power supply devices.
The battery charging circuit 2 is connected between the power source 1 and the battery 3. Wherein,
the input end of the switch module 21 is connected to the output end of the power supply 1, and the output end is connected with the input end of the battery 3;
the charging control terminal of the charging control module 22 is connected to the control terminal of the switch module 21, and outputs a control signal to control the switch module 21 to be turned on, so that the power supply 1 charges the battery 3.
The battery voltage detection terminal of the charging control module 22 is connected to the input terminal of the battery 3, and detects the battery voltage.
The current regulating terminal of the charging control module 22 is connected to the input terminal of the switch module 21, and regulates the charging current of the battery 3 according to the battery voltage detected by the battery voltage detecting terminal, so that the battery 3 is effectively charged at different voltage stages.
As a preferred embodiment of the present invention, the battery charging circuit 2 further includes an overcharge protection module 24 connected in the battery charging circuit, and when the battery 3 is fully charged and the switch module 21 is not turned off in time, the battery charging circuit is cut off to protect the battery from being overcharged.
As a preferred embodiment of the present invention, the battery charging circuit 2 further comprises a charging indication module 23 connected to the charging state output terminal of the charging control module 22 for indicating the charging state of the battery.
The battery charging circuit provided by the embodiment of the invention can be used for charging a lithium battery and can also be used for charging other chemical batteries.
The battery charging circuit provided by the embodiment of the invention can be used for completely charging the lithium ion battery without overcharging, the magnitude of the charging current is adaptively adjusted according to the magnitude of the voltage of the lithium ion battery, the lithium ion battery can be effectively charged in different voltage stages (a pre-charging stage, a constant current charging stage and a constant voltage charging stage), the precision of the output voltage of the battery charging circuit is improved, and the battery charging circuit has the advantages of simplicity, reliability, low price, portability, high efficiency and the like.
Fig. 2 shows a circuit configuration of a battery charging circuit provided in an embodiment of the present invention, and for convenience of explanation, only a part related to the embodiment of the present invention is shown.
In the embodiment of the present invention, the switch module 21 may be implemented by using an integrated chip U1. The ic U1 is a low on-resistance fet with a gate connected to the charging control terminal of the charging control module 22, a source connected to the output terminal of the power supply 1, and a drain connected to the input terminal of the battery 3.
As an embodiment of the present invention, the battery charging circuit 2 further includes a diode D1 and a resistor R1, wherein an anode of the diode D1 is connected to the output terminal of the power supply 1, and a cathode is connected to the input terminal of the switch module 21 through the resistor R1.
The charging control module 22 includes a charging chip U2, a resistor R2, a resistor R6, a resistor R10, and a resistor R7, wherein:
a power supply input terminal VCC of the charging chip U2 is connected to the cathode of the diode D1, a temperature detection terminal TS is grounded through a resistor R7, a charging control terminal CC is connected to the cathode of the diode D1 through a resistor R2, a charging enable terminal FB/CE is connected to the cathode of the diode D1, a current regulation terminal SNS is connected to the input terminal of the switch module 21, a battery voltage detection terminal BAT is connected to the input terminal of the battery 3, a ground terminal VSS is grounded, and a charging state output terminal STAT is connected with the charging indication module 23;
the resistor R6 and the resistor R10 are sequentially connected between the cathode of the diode D1 and the ground in series, and the series connection end of the resistor R6 and the resistor R10 is connected to the temperature detection end TS of the charging chip U2.
In the embodiment of the present invention, the resistor R10 may be a negative temperature coefficient resistor, and is configured to detect the surface temperature of the battery 3 and feed back the detection result to the charging chip U2, and when the surface temperature of the battery 3 exceeds a predetermined range, the charging control terminal of the charging chip U2 outputs a control signal to control the switch module 21 to be turned off, and the power supply 1 stops charging the battery 3. When the surface temperature of the battery 3 is normal, the charge enable terminal FB/CE of the charge chip U2 is powered on to start working, the charge control terminal CC of the charge chip U2 outputs a control signal and drives the fet U1 to conduct, and the power supply 1 starts charging the battery 3. The charging chip U2 can automatically adjust the charging current through the current regulation terminal SNS according to the condition of the battery voltage detected by the battery voltage detection terminal BAT, thereby ensuring that the battery 3 is effectively charged at different voltage stages.
As an embodiment of the present invention, the charging control module 22 further includes a ripple capacitor C1 and a filter capacitor C2 connected in parallel with the ripple capacitor C1. One end of the ripple capacitor C1 is connected to the connection end of the power input end VCC of the charging chip U2 and the cathode of the diode D1, and the other end of the ripple capacitor C1 is grounded. The ripple capacitor C1 is used for suppressing voltage fluctuation and ensuring voltage stability. The filter capacitor C2 is used for filtering interference, improves the quality of the power supply, and ensures the stable and reliable work of the charging chip U2.
The charging indication module 23 comprises a light emitting diode D2, a light emitting diode D3, a resistor R3, a resistor R4 and a resistor R5, wherein:
the resistor R5 is connected between the charging state output end STAT of the charging chip U2 and the ground;
the cathode of the light emitting diode D2 is connected to the charge state output end STAT of the charging chip U2, and the anode is connected to the output end of the power supply 1 through a resistor R3;
the anode of the light emitting diode D3 is connected to the charge state output terminal STAT of the charging chip U2, and the cathode is grounded through a resistor R4.
When the battery 3 is charged normally, the charging state output end STAT of the charging chip U2 is at a low level, the light-emitting diode D2 is lightened, and the light-emitting diode D3 is extinguished; when the battery 3 is fully charged, the charging state output end STAT of the charging chip U2 is at a high level, the light-emitting diode D3 is lightened, and the light-emitting diode D2 is extinguished; when the surface temperature of the battery 3 is abnormal, the light emitting diode D3 and the light emitting diode D2 are simultaneously lighted slightly.
The overcharge protection module 24 includes a protection chip U3, a dual MOS chip U4, a resistor R8, a resistor R9, and a capacitor C5, wherein:
the power supply terminal VCC of the protection chip U3 is connected to the positive electrode B & lt + & gt of the input end of the battery 3 through a resistor R9, the power supply terminal VCC is also connected to the ground terminal GND of the protection chip U3 through a capacitor C5, and the ground terminal GND of the protection chip U3 is connected to the negative electrode B & lt- & gt of the input end of the battery 3;
the grid electrode of a first MOS tube U4A in the double MOS chip U4 is connected to a battery overcharge control end OC of a protection chip U3, the source electrode is grounded, the source electrode is also connected to a current detection input end CS of the protection chip U3 through a resistor R8, and the drain electrode is connected to the drain electrode of a second MOS tube U4B in the double MOS chip U4;
the grid electrode of the second MOS tube U4B is connected to the battery over-discharge control end OD of the protection chip U3, and the source electrode is connected to the negative electrode B-of the input end of the battery 3.
When charging is completed, under normal conditions, the charging control end of the charging chip U2 outputs a control signal and controls the field-effect tube U1 to be disconnected, and charging is stopped. When the battery 3 is fully charged and the electric field effect tube U1 is not turned off in time, the overcharge protection module 24 cuts off the charging loop of the battery 3 to protect the battery from being overcharged, thereby ensuring stable and reliable charging.
As an embodiment of the present invention, the battery charging circuit 2 further includes a ripple capacitor C3 and a filter capacitor C4 connected in parallel with the ripple capacitor C3. One end of the ripple capacitor C3 is connected to the connection end of the switch module 21 and the battery 3, and the other end of the ripple capacitor C3 is grounded. The ripple capacitor C3 is used for suppressing voltage fluctuation and ensuring voltage stability. The filter capacitor C4 is used for filtering interference and improving the quality of the power supply.
In the battery charging circuit provided by the embodiment of the invention, the voltage of the battery is detected through the battery voltage detection end of the charging control module, and the current regulation end of the charging control module adaptively regulates the charging current of the battery according to the detected voltage of the battery, so that the battery is effectively charged at different voltage stages, the service life of the battery is prolonged, the circuit is simple and reliable, and the cost is saved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A battery charging circuit for charging a battery by a power source, the circuit comprising: the charging control system comprises a switch module and a charging control module;
the input end of the switch module is connected with the output end of the power supply, and the output end of the switch module is connected with the input end of the battery;
the charging control end of the charging control module is connected to the control end of the switch module, and outputs a control signal to control the switch module to be conducted;
the battery voltage detection end of the charging control module is connected to the input end of the battery to detect the voltage of the battery;
and the current regulating end of the charging control module is connected to the input end of the switch module, and the charging current is regulated according to the battery voltage detected by the battery voltage detecting end.
2. The battery charging circuit of claim 1, wherein the switching module comprises a field effect transistor;
the grid electrode of the field effect transistor is connected to the charging control end of the charging control module, the source electrode of the field effect transistor is connected to the output end of the power supply, and the drain electrode of the field effect transistor is connected to the input end of the battery.
3. The battery charging circuit of claim 1, wherein the charging control module comprises a charging chip U2, a resistor R2, a resistor R6, a resistor R10, and a resistor R7;
the power supply input end of the charging chip U2 is connected to the cathode of the diode D1, the temperature detection end is grounded through the resistor R7, the charging control end is connected to the cathode of the diode D1 through the resistor R2, the charging enable end is connected to the cathode of the diode D1, the current regulation end is connected to the input end of the switch module, and the battery voltage detection end is connected to the input end of the battery;
the resistor R6 and the resistor R10 are sequentially connected between the cathode of the diode D1 and the ground in series, and the series connection end of the resistor R6 and the resistor R10 is connected to the temperature detection end of the charging chip U2.
4. The battery charging circuit of claim 3, wherein the charging control module further comprises a ripple capacitor C1, and a filter capacitor C2 connected in parallel with the ripple capacitor C1;
one end of the ripple capacitor C1 is connected to the connection end of the power input end of the charging chip U2 and the cathode of the diode D1, and the other end of the ripple capacitor C1 is grounded.
5. The battery charging circuit of claim 1, further comprising:
and the overcharge protection module is connected in the battery charging loop, and the battery charging loop is cut off when the battery is fully charged and the switch module is switched on.
6. The battery charging circuit of claim 5, wherein the overcharge protection module comprises a protection chip U3, a dual MOS chip U4, a resistor R8, a resistor R9, and a capacitor C5;
the power supply end of the protection chip U3 is connected to the positive electrode of the input end of the battery through the resistor R9 and is also connected to the ground end of the protection chip U3 through the capacitor C5, and the ground end of the protection chip U3 is connected to the negative electrode of the input end of the battery;
the grid electrode of a first MOS tube in the double MOS chip U4 is connected to the battery overcharge control end of the protection chip U3, the source electrode of the first MOS tube is grounded, the source electrode of the first MOS tube is also connected to the current detection input end of the protection chip U3 through the resistor R8, and the drain electrode of the first MOS tube is connected to the drain electrode of a second MOS tube in the double MOS chip U4;
the grid electrode of the second MOS tube is connected to the battery over-discharge control end of the protection chip U3, and the source electrode of the second MOS tube is connected to the cathode of the input end of the battery.
7. The battery charging circuit of claim 1, further comprising:
and the charging indication module is connected to the charging state output end of the charging control module and is used for indicating the charging state of the battery.
8. The battery charging circuit of claim 4, wherein the charge indication module comprises a light emitting diode D2, a light emitting diode D3, a resistor R3, a resistor R4, and a resistor R5;
the resistor R5 is connected between the charging state output end of the charging control module and the ground;
the cathode of the light emitting diode D2 is connected to the charging state output end of the charging control module, and the anode is connected to the output end of the power supply through the resistor R3;
the anode of the light emitting diode D3 is connected to the charging state output terminal of the charging control module, and the cathode is grounded through the resistor R4.
9. The battery charging circuit of claim 2, further comprising a ripple capacitor C3, and a filter capacitor C4 connected in parallel with the ripple capacitor C3;
one end of the ripple capacitor C3 is connected to the connection end of the field effect transistor and the battery, and the other end of the ripple capacitor C3 is grounded.
10. A power supply device comprising the battery charging circuit of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010102706A CN101741124A (en) | 2010-01-25 | 2010-01-25 | Battery charging circuit and power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010102706A CN101741124A (en) | 2010-01-25 | 2010-01-25 | Battery charging circuit and power supply device |
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| Publication Number | Publication Date |
|---|---|
| CN101741124A true CN101741124A (en) | 2010-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010102706A Pending CN101741124A (en) | 2010-01-25 | 2010-01-25 | Battery charging circuit and power supply device |
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| CN (1) | CN101741124A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426138A (en) * | 2013-08-20 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Over-discharge protection circuit of chargeable battery |
| CN104779653A (en) * | 2014-01-10 | 2015-07-15 | 海洋王（东莞）照明科技有限公司 | Charging indicating circuit |
| CN105634062A (en) * | 2016-01-31 | 2016-06-01 | 苏黎 | Charging circuit and system for mobile terminal |
| CN105656117A (en) * | 2016-01-18 | 2016-06-08 | 深圳市中孚能电气设备有限公司 | Charging circuit and charging method thereof |
| CN105743180A (en) * | 2014-12-24 | 2016-07-06 | 广东欧珀移动通信有限公司 | Method for charging electronic equipment, and electronic equipment |
| CN107104492A (en) * | 2017-07-04 | 2017-08-29 | 红豆电信有限公司 | Power circuit |
| CN108832679A (en) * | 2018-06-25 | 2018-11-16 | 吉林工程技术师范学院 | Electric car DC charging machine control system |
| CN109031097A (en) * | 2018-07-25 | 2018-12-18 | 天地融电子（天津）有限公司 | A kind of chip-detecting apparatus |
| WO2019047434A1 (en) * | 2017-09-11 | 2019-03-14 | 深圳易马达科技有限公司 | Charging circuit and charging device |
| CN113489114A (en) * | 2021-08-03 | 2021-10-08 | 广东友电新能源科技有限公司 | Charging control circuit, charging control method and charging device |
| CN113629813A (en) * | 2021-08-13 | 2021-11-09 | 瀚昕微电子(无锡)有限公司 | Charging equipment |
-
2010
- 2010-01-25 CN CN201010102706A patent/CN101741124A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104426138A (en) * | 2013-08-20 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Over-discharge protection circuit of chargeable battery |
| CN104779653A (en) * | 2014-01-10 | 2015-07-15 | 海洋王（东莞）照明科技有限公司 | Charging indicating circuit |
| CN105743180A (en) * | 2014-12-24 | 2016-07-06 | 广东欧珀移动通信有限公司 | Method for charging electronic equipment, and electronic equipment |
| CN105743180B (en) * | 2014-12-24 | 2019-09-06 | Oppo广东移动通信有限公司 | Method and electronic equipment for charging for electronic equipment |
| CN105656117A (en) * | 2016-01-18 | 2016-06-08 | 深圳市中孚能电气设备有限公司 | Charging circuit and charging method thereof |
| CN105634062A (en) * | 2016-01-31 | 2016-06-01 | 苏黎 | Charging circuit and system for mobile terminal |
| CN107104492A (en) * | 2017-07-04 | 2017-08-29 | 红豆电信有限公司 | Power circuit |
| CN107104492B (en) * | 2017-07-04 | 2023-08-22 | 红豆电信有限公司 | Power supply circuit |
| WO2019047434A1 (en) * | 2017-09-11 | 2019-03-14 | 深圳易马达科技有限公司 | Charging circuit and charging device |
| CN108832679A (en) * | 2018-06-25 | 2018-11-16 | 吉林工程技术师范学院 | Electric car DC charging machine control system |
| CN109031097A (en) * | 2018-07-25 | 2018-12-18 | 天地融电子（天津）有限公司 | A kind of chip-detecting apparatus |
| CN113489114A (en) * | 2021-08-03 | 2021-10-08 | 广东友电新能源科技有限公司 | Charging control circuit, charging control method and charging device |
| CN113489114B (en) * | 2021-08-03 | 2022-07-19 | 广东友电新能源科技有限公司 | Charging control circuit, charging control method and charging device |
| CN113629813A (en) * | 2021-08-13 | 2021-11-09 | 瀚昕微电子(无锡)有限公司 | Charging equipment |
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Application publication date: 20100616 |