CN111211586A - Lithium battery charging clamping circuit and power supply - Google Patents
Lithium battery charging clamping circuit and power supply Download PDFInfo
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- CN111211586A CN111211586A CN201811389798.8A CN201811389798A CN111211586A CN 111211586 A CN111211586 A CN 111211586A CN 201811389798 A CN201811389798 A CN 201811389798A CN 111211586 A CN111211586 A CN 111211586A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 115
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 112
- 238000001514 detection method Methods 0.000 claims abstract description 53
- 230000006641 stabilisation Effects 0.000 claims abstract description 33
- 238000011105 stabilization Methods 0.000 claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims description 17
- 238000001914 filtration Methods 0.000 claims description 14
- 230000005669 field effect Effects 0.000 claims description 12
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims 1
- 230000002411 adverse Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 210000004027 cell Anatomy 0.000 description 14
- 238000010586 diagram Methods 0.000 description 4
- 230000009931 harmful effect Effects 0.000 description 3
- 150000002641 lithium Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 210000005056 cell body Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Abstract
A lithium battery charging clamp circuit, comprising: the charging device comprises a voltage detection module, a switch module, a voltage stabilization control module, a boosting module and a charging voltage adjustment module; the voltage detection module is used for detecting the charging voltage of the lithium battery to generate a first voltage detection signal and generating a switch control signal according to the first voltage detection signal; the switch module is used for switching on or switching off the charging voltage of the lithium battery according to the switch control signal; the boost module is used for generating a first voltage according to the charging voltage of the lithium battery; the voltage stabilization control module is used for detecting the charging voltage of the lithium battery to generate a second voltage detection signal and generating a pulse width modulation signal according to the second voltage detection signal; the charging voltage adjusting module is used for adjusting the charging voltage according to the pulse width modulation signal and the first voltage; the charging voltage of the lithium battery is accurately clamped, the lithium battery can be charged within a safe range, and adverse effects of over-charging on the lithium battery or charging equipment are effectively avoided.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium battery charging clamping circuit and a power supply.
Background
At present, the phenomenon of overcharge easily appears in the lithium cell in charging process for unnecessary electric energy converts into heat energy, not only can lead to the lithium cell body temperature to rise and influence the life-span of lithium cell, still can damage the charger or the electronic product that do not have the overcharge protection, has very big potential safety hazard. In order to avoid the phenomenon of overcharge of the lithium battery to affect the service life, two ends of a lithium battery equalizing chip are directly connected with a resistor in parallel, and because the voltage of the lithium battery equalizing chip is constant, the resistor is constant, so that the equalizing current is also constant.
Therefore, the lithium battery charging clamping circuit in the traditional technical scheme has the problem that the lithium battery cannot be charged in an equalizing way and cannot be clamped accurately in the charging voltage.
Disclosure of Invention
The invention provides a lithium battery charging clamping circuit and a power supply, and aims to solve the problem that a lithium battery charging clamping circuit in the traditional technical scheme cannot enable a lithium battery to be charged in an equalizing way and cannot clamp charging voltage accurately.
The invention is realized in this way, a lithium battery charging clamping circuit, comprising:
the voltage detection module is connected with the lithium battery and used for detecting the charging voltage of the lithium battery to generate a first voltage detection signal and generating a switch control signal according to the first voltage detection signal;
the switch module is connected with the voltage detection module and the lithium battery and used for switching on or switching off the charging voltage of the lithium battery according to the switch control signal;
the boosting module is connected with the switch module and used for generating a first voltage according to the charging voltage of the lithium battery;
the voltage stabilization control module is connected with the lithium battery and the boosting module and is used for detecting the charging voltage of the lithium battery to generate a second voltage detection signal and generating a pulse width modulation signal according to the second voltage detection signal; and
and the charging voltage adjusting module is connected with the voltage stabilizing control module and used for adjusting the charging voltage according to the pulse width modulation signal and the first voltage.
In addition, a power supply is also provided, and the power supply comprises the lithium battery charging clamping circuit.
The lithium battery charging clamping circuit comprises a voltage detection module, a switch module, a boosting module, a voltage stabilization control module and a charging voltage adjusting module, wherein the voltage detection module is used for detecting the charging voltage of a lithium battery to generate a first voltage detection signal, and generating a switch control signal according to the first voltage detection signal to control the switch module to switch on or switch off the charging voltage of the lithium battery; this lithium battery charging clamping circuit can dynamic adjustment lithium cell's charging current through the duty cycle of adjusting pulse width modulation signal to make the charging voltage of lithium cell obtain accurate clamper, can ensure that the lithium cell charges in the safety range, effectively avoided overcharging to lithium cell or battery charging outfit's harmful effects.
Drawings
Fig. 1 is a block diagram of a lithium battery charging clamping circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a lithium battery charging clamping 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.
Fig. 1 is a block diagram of a lithium battery charging clamp circuit according to a preferred embodiment of the present invention, and for convenience of illustration, only the parts related to this embodiment are shown, and the details are as follows:
referring to fig. 1, the lithium battery charging clamp circuit includes: the charging voltage control circuit comprises a voltage detection module 10, a switch module 20, a voltage stabilization control module 40, a boosting module 30 and a charging voltage adjusting module 50.
The voltage detection module 10 is connected to the lithium battery, and is configured to detect a charging voltage of the lithium battery to generate a first voltage detection signal, and generate a switch control signal according to the first voltage detection signal; the switch module 20 is connected with the voltage detection module 10 and the lithium battery, and is used for conducting or switching off the charging voltage of the lithium battery according to the switch control signal; the boost module 30 is connected to the switch module 20, and is configured to generate a first voltage according to a charging voltage of the lithium battery; the voltage stabilization control module 40 is connected to the lithium battery and boosting module 30, and is configured to detect a charging voltage of the lithium battery to generate a second voltage detection signal, and generate a pulse width modulation signal according to the second voltage detection signal; the charging voltage adjusting module 50 is connected to the regulated voltage control module 40 for adjusting the charging voltage according to the pulse width modulation and the first voltage. In a particular embodiment, the voltage detection module 10 includes a micropower voltage detector.
In this embodiment, the voltage detection module 10 detects the charging voltage of the lithium battery to generate a first voltage detection signal, and generates a switch control signal according to the first voltage detection signal to control the switch module 20 to turn on or off the charging voltage of the lithium battery, the voltage boost module 30 generates the first voltage according to the charging voltage of the lithium battery, and the voltage stabilization control module 40 detects the charging voltage of the lithium battery to generate a second voltage detection signal, and generates a pulse width modulation signal according to the second voltage detection signal, so that the charging voltage adjustment module 50 adjusts the charging voltage of the lithium battery according to the pulse width modulation signal and the first voltage, thereby clamping the charging voltage of the lithium battery; this lithium battery charging clamping circuit can dynamic adjustment lithium cell's charging current through the duty cycle of adjusting pulse width modulation signal to make the charging voltage of lithium cell obtain accurate clamper, can ensure that the lithium cell charges in the safety range, effectively avoided overcharging to lithium cell or battery charging outfit's harmful effects.
In one embodiment, referring to fig. 2, the switch module 20 includes a first fet Q1, the control terminal of the first fet Q1 being the switch control terminal of the switch module 20, the high potential terminal of the first fet Q1 being the input terminal of the switch module 20, and the low potential terminal of the first fet Q1 being the output terminal of the switch module 20. In a specific embodiment, referring to fig. 2, the first fet Q1 comprises a PMOS transistor having a gate, a drain, and a source respectively being a control terminal, a high potential terminal, and a low potential terminal of the first fet Q1. The switch module 20 of the present embodiment can switch on or off the charging voltage of the lithium battery according to the switch control signal.
In one embodiment, the boost module 30 includes: referring to fig. 2, a boost chip U1, a first inductor L1, a first diode D1, a first resistor R1, a second resistor R2, and a first capacitor C1; the working power supply end of the boost chip U1 is connected in common with the first end of the first inductor L1 as the input end of the boost module 30, the ground end of the boost chip U1 is grounded, the voltage output end of the boost chip U1, the second end of the first inductor L1 and the anode of the first diode D1 are connected in common, the voltage feedback end of the boost chip U1, the first end of the first resistor R1 and the first end of the second resistor R2 are connected in common, the second end of the second resistor R2 is connected in ground, and the cathode of the first diode D1 and the second end of the first resistor R1 are connected in common as the output end of the boost module 30. The boosting module 30 of the present embodiment can boost the charging voltage of the lithium battery to generate the first voltage.
In one embodiment, referring to fig. 2, the voltage stabilization control module 40 includes: the voltage stabilizing control circuit comprises a voltage stabilizing control chip U2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a second capacitor C2; a first end of a fourth resistor R4 is a reference voltage input end of the voltage stabilization control module 40, a second end of the fourth resistor R4, a first end of a fifth resistor R5 and a reference voltage input end of a voltage stabilization control chip U2 are connected in common, a second end of the fifth resistor R5 is grounded, a detection voltage input end of a voltage stabilization control chip U2 is a detection voltage input end of the voltage stabilization control module 40, an operating power supply end of the voltage stabilization control chip U2 is a power supply end of the voltage stabilization control module 40, a clock oscillation resistor input end of the voltage stabilization control chip U2 is connected with a first end of a third resistor R3, a clock oscillation capacitor input end of the voltage stabilization control chip U2 is connected with a first end of a second capacitor C2, a ground end of the voltage stabilization control chip U2, a second end of the third resistor R3, a first end of an eighth resistor R8 and a second end of a second capacitor C2 are connected with ground, a first pulse width modulation signal output end of the voltage stabilization control chip U2 is connected with a first end of a sixth resistor R, the second pwm signal output terminal of the regulator control chip U2 is connected to the first terminal of the seventh resistor R7, and the second terminal of the sixth resistor R6, the second terminal of the seventh resistor R7, and the second terminal of the eighth resistor R8 are commonly connected to serve as the pwm signal output terminal of the regulator control module 40. The voltage stabilizing control module 40 of this embodiment can generate a high-level pulse width modulation signal or a low-level pulse width modulation signal according to the charging voltage of the lithium battery, the set reference voltage, and the on-off condition of the switch module 20, and further control the charging voltage adjusting module 50 to turn on or off the charging voltage of the lithium battery so as to accurately clamp the charging voltage.
In one embodiment, referring to fig. 2, the charging voltage adjusting module 50 includes: a second field effect transistor Q2, a ninth resistor R9, a first triode TV1 and a second triode TV 2; the base electrode of the first triode TV1 and the base electrode of the second triode TV2 are connected in common to be used as the control end of the charging voltage adjusting module 50, the input end of the first triode TV1 is connected with the working power supply, the output end of the first triode TV1, the output end of the second triode TV2 and the control end of the second field-effect tube Q2 are connected in common, the input end of the second triode TV2 and the low-potential end of the second field-effect tube Q2 are connected in common to be used as the output end of the charging voltage adjusting module 50, the high-potential end of the second field-effect tube Q2 is connected with the first end of the ninth resistor R9, and the second end of the ninth resistor R9 is used as the input end of the charging voltage adjusting module. In a specific embodiment, the second fet Q2 is an NMOS transistor, and the gate, the drain and the source of the NMOS transistor are the control terminal, the low potential terminal and the high potential terminal of the second fet Q2, respectively. The first transistor TV1 is an NPN transistor, and a base, an emitter, and a collector of the NPN transistor are a control terminal, an output terminal, and an input terminal of the first transistor TV1, respectively. The second transistor TV2 is a PNP transistor, and the base, emitter, and collector of the PNP transistor are the control terminal, input terminal, and output terminal of the second transistor TV2, respectively. The ninth resistor R9 is a bleeder resistor, which can bleed off the charge stored in the equivalent capacitor of the gate of the second fet Q2, thereby preventing the second fet Q2 from burning out. The charging voltage adjusting module 50 of this embodiment can realize dynamically adjusting the charging current of the lithium battery according to the pulse width modulation signal and the first voltage, thereby performing closed-loop accurate clamping on the charging voltage of the lithium battery.
In one embodiment, referring to fig. 2, the lithium battery charging clamp circuit further comprises: a first filtering module 60, where the first filtering module 60 is configured to filter the charging voltage of the lithium battery. In a specific embodiment, the first filter module 60 includes a tenth resistor R10 and a third capacitor C3, a first terminal of the tenth resistor R10 serves as an input terminal of the first filter module 60, a second terminal of the tenth resistor R10 and a second terminal of the third capacitor C3 are connected in common to serve as an output terminal of the first filter module 60, and a second terminal of the third capacitor C3 is connected to ground. The first filtering module of the embodiment performs filtering processing on the charging voltage of the lithium battery, so that the ripple coefficient of the charging voltage can be reduced, and the detection result of the charging voltage is more accurate.
In one embodiment, referring to fig. 2, the lithium battery charging clamp circuit further comprises: and a second filtering module 70, where the second filtering module 70 is configured to filter the charging voltage of the lithium battery. In a specific embodiment, the second filtering module 70 includes an eleventh resistor R11 and a fourth capacitor C4, a first end of the eleventh resistor R11 and a first end of the fourth capacitor C4 are commonly connected as an input/output end of the second filtering module 70, and a second end of the eleventh resistor R11 and a second end of the fourth capacitor C4 are both grounded. The first filtering module of the embodiment performs filtering processing on the charging voltage of the lithium battery, so that the ripple coefficient of the charging voltage can be reduced, and the detection result of the charging voltage is more accurate.
In addition, a power supply is also provided, which comprises the battery charging clamping circuit.
The operation of the clamp circuit for charging lithium batteries according to the present invention will be described below by taking the schematic circuit diagram shown in fig. 2 as an example, and the following details are provided:
in the charging process of the lithium battery, the micro-power-consumption voltage detector detects the charging voltage of the lithium battery in real time, a first voltage detection signal detected by the micro-power-consumption voltage detector is compared with the threshold voltage of the lithium battery, when the first voltage detection signal is lower than the threshold voltage, the micro-power-consumption voltage detector outputs a high-level switch control signal, the first field-effect tube Q1 is cut off, and the charging voltage of the lithium battery is in a set safety range at the moment.
When the first voltage detection signal is higher than the threshold voltage, the micropower voltage detector outputs a low-level switch control signal, at the moment, the first field-effect tube Q1 is conducted, the boosting chip U1, the first inductor L1 and the first diode D1 form a boosting module 30 for boosting the charging voltage of the lithium battery to generate a first voltage, so that the voltage-stabilizing control chip U2 works and detects the charging voltage of the lithium battery to generate a second voltage detection signal, the second voltage detection signal is compared with the reference voltage to output a pulse width modulation signal corresponding to the duty ratio, and the pulse width modulation signal enables the first triode TV1, the second triode TV2 and the second field-effect tube Q2 to be switched on and off according to the duty ratio; therefore, the on-off of the second field effect transistor Q2 can be dynamically controlled by adjusting the duty ratio of the pulse width modulation signal output by the voltage stabilization control chip U2 so as to adjust the charging current of the lithium battery, and further the charging voltage of the lithium battery is accurately clamped.
The invention has the beneficial effects that:
(1) the charging voltage of the lithium battery is detected through the voltage detection module to generate a first voltage detection signal, a switch control signal is generated according to the first voltage detection signal to control the switching module to switch on or switch off the charging voltage of the lithium battery, the boosting module generates a first voltage according to the charging voltage of the lithium battery, meanwhile, the voltage stabilization control module detects the charging voltage of the lithium battery to generate a second voltage detection signal, and a pulse width modulation signal is generated according to the second voltage detection signal, so that the charging voltage of the lithium battery is adjusted by the charging voltage adjustment module according to the pulse width modulation signal and the first voltage, and the charging voltage of the lithium battery is clamped.
(2) This lithium battery charging clamping circuit can dynamic adjustment lithium cell's charging current through the duty cycle of adjusting pulse width modulation signal to make the charging voltage of lithium cell obtain accurate clamper, can ensure that the lithium cell charges in the safety range, effectively avoided overcharging to lithium cell or battery charging outfit's harmful effects.
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 (9)
1. A lithium battery charging clamp, comprising:
the voltage detection module is connected with the lithium battery and used for detecting the charging voltage of the lithium battery to generate a first voltage detection signal and generating a switch control signal according to the first voltage detection signal;
the switch module is connected with the voltage detection module and the lithium battery and used for switching on or switching off the charging voltage of the lithium battery according to the switch control signal;
the boosting module is connected with the switch module and used for generating a first voltage according to the charging voltage of the lithium battery;
the voltage stabilization control module is connected with the lithium battery and the boosting module and is used for detecting the charging voltage of the lithium battery to generate a second voltage detection signal and generating a pulse width modulation signal according to the second voltage detection signal; and
and the charging voltage adjusting module is connected with the voltage stabilizing control module and used for adjusting the charging voltage according to the pulse width modulation signal and the first voltage.
2. The lithium battery charging clamp of claim 1, wherein the lithium battery charging clamp further comprises:
and the first filtering module is connected with the lithium battery and the voltage detection module and used for filtering the charging voltage of the lithium battery.
3. The lithium battery charging clamp of claim 2, wherein the lithium battery charging clamp further comprises:
and the second filtering module is connected with the switch module and the boosting module and used for filtering the charging voltage of the lithium battery.
4. The lithium battery charging clamp circuit as claimed in claim 3, wherein said switching module comprises a first fet, a control terminal of said first fet being a switching control terminal of said switching module, a high potential terminal of said first fet being an input terminal of said switching module, and a low potential terminal of said first fet being an output terminal of said switching module.
5. The lithium battery charging clamp circuit of claim 3, wherein the boost module comprises: the boost circuit comprises a boost chip, a first inductor, a first diode, a first resistor, a second resistor and a first capacitor;
the working power supply end of the boosting chip and the first end of the first inductor are connected in common to serve as the input end of the boosting module, the ground end of the boosting chip is grounded, the voltage output end of the boosting chip, the second end of the first inductor and the anode of the first diode are connected in common, the voltage feedback end of the boosting chip, the first end of the first resistor and the first end of the second resistor are connected in common, the second end of the second resistor is connected in ground, and the cathode of the first diode and the second end of the first resistor are connected in common to serve as the output end of the boosting module.
6. The lithium battery charging clamp circuit of claim 3, wherein the voltage regulation control module comprises: the voltage stabilizing control chip comprises a voltage stabilizing control chip, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a second capacitor;
the first end of the fourth resistor is a reference voltage input end of the voltage stabilization control module, the second end of the fourth resistor, the first end of the fifth resistor and the reference voltage input end of the voltage stabilization control chip are connected in common, the second end of the fifth resistor is grounded, the detection voltage input end of the voltage stabilization control chip is a detection voltage input end of the voltage stabilization control module, the working power supply end of the voltage stabilization control chip is a power supply end of the voltage stabilization control module, the clock oscillation resistor input end of the voltage stabilization control chip is connected with the first end of the third resistor, the clock oscillation capacitor input end of the voltage stabilization control chip is connected with the first end of the second capacitor, and the ground end of the voltage stabilization control chip, the second end of the third resistor, the first end of the eighth resistor and the second end of the second capacitor are all connected to ground, the first pulse width modulation signal output end of the voltage stabilization control chip is connected with the first end of the sixth resistor, the second pulse width modulation signal output end of the voltage stabilization control chip is connected with the first end of the seventh resistor, and the second end of the sixth resistor, the second end of the seventh resistor and the second end of the eighth resistor are connected together to serve as the pulse width modulation signal output end of the voltage stabilization control module.
7. The lithium battery charging clamp of claim 3, wherein the charging voltage adjustment module comprises: the second field effect transistor, the ninth resistor, the first triode and the second triode;
the base electrode of the first triode and the base electrode of the second triode are connected in common to be used as the control end of the charging voltage adjusting module, the input end of the first triode is connected with a working power supply, the output end of the first triode, the output end of the second triode and the control end of the second field-effect tube are connected in common, the input end of the second triode and the low-potential end of the second field-effect tube are connected in common to be used as the output end of the charging voltage adjusting module, the high-potential end of the second field-effect tube is connected with the first end of the ninth resistor, and the second end of the ninth resistor is used as the input end of the charging voltage adjusting module.
8. The lithium battery charging clamp circuit of any of claims 1 to 7, wherein the voltage detection module comprises a micropower voltage detector.
9. A power supply comprising the lithium battery charging clamp of any of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811389798.8A CN111211586A (en) | 2018-11-21 | 2018-11-21 | Lithium battery charging clamping circuit and power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811389798.8A CN111211586A (en) | 2018-11-21 | 2018-11-21 | Lithium battery charging clamping circuit and power supply |
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| CN111211586A true CN111211586A (en) | 2020-05-29 |
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| CN201811389798.8A Pending CN111211586A (en) | 2018-11-21 | 2018-11-21 | Lithium battery charging clamping circuit and power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117261689A (en) * | 2023-08-04 | 2023-12-22 | 南京项尚车联网技术有限公司 | Battery voltage detection method and system for battery vehicle |
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|---|---|---|---|---|
| CN1199265A (en) * | 1997-02-03 | 1998-11-18 | 索尼公司 | Battery charger and battery charging method |
| CN101394094A (en) * | 2007-09-20 | 2009-03-25 | 李仕清 | Full automatic high efficient voltage step-up step-down circuit |
| CN101572425A (en) * | 2009-06-15 | 2009-11-04 | 江苏工业学院 | Buck-boost adjustable quick charger |
| CN209358257U (en) * | 2018-11-21 | 2019-09-06 | 深圳市多氟多新能源科技有限公司 | A kind of lithium battery charging clamp circuit and power supply |
-
2018
- 2018-11-21 CN CN201811389798.8A patent/CN111211586A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1199265A (en) * | 1997-02-03 | 1998-11-18 | 索尼公司 | Battery charger and battery charging method |
| CN101394094A (en) * | 2007-09-20 | 2009-03-25 | 李仕清 | Full automatic high efficient voltage step-up step-down circuit |
| CN101572425A (en) * | 2009-06-15 | 2009-11-04 | 江苏工业学院 | Buck-boost adjustable quick charger |
| CN209358257U (en) * | 2018-11-21 | 2019-09-06 | 深圳市多氟多新能源科技有限公司 | A kind of lithium battery charging clamp circuit and power supply |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117261689A (en) * | 2023-08-04 | 2023-12-22 | 南京项尚车联网技术有限公司 | Battery voltage detection method and system for battery vehicle |
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