CN218276168U - Battery charging protection circuit - Google Patents
Battery charging protection circuit Download PDFInfo
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- CN218276168U CN218276168U CN202222549910.8U CN202222549910U CN218276168U CN 218276168 U CN218276168 U CN 218276168U CN 202222549910 U CN202222549910 U CN 202222549910U CN 218276168 U CN218276168 U CN 218276168U
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Abstract
The utility model discloses a battery charging protection circuit, detect the temperature on battery surface through setting up temperature detection module, and be connected temperature detection module's output and the first input of little the control unit, and little the control output of the control unit is connected with the module of charging, when making temperature detection module monitor battery surface temperature too high, can transmit temperature signal to little the control unit, output control signal makes the module of charging shutdown after acquireing temperature signal through little the control unit, thereby avoided equipment still to continue to charge to the battery when battery temperature is too high, and lead to the battery to keep high temperature to influence the user and use, and make the problem that battery life subtracts the weak point.
Description
Technical Field
The utility model relates to a charging circuit technical field especially relates to a battery charging protection circuit.
Background
With the development of electronic technology, more and more electronic devices, i.e., products, adopt an integrated battery to supply power to the devices. Such as equipment such as cell-phone, flat board and intelligent bracelet, the battery designs as an organic whole with the product itself. The battery is charged by setting interfaces such as USB and TYPE-C and connecting the interfaces with the charger, so that the endurance of the equipment is realized.
However, during the charging of a product by a charger, the device tends to be hot. Especially when a quick-charging charger is used, the charging power is higher, so that the equipment is easier to scald. The heating of the battery not only affects the user's use, but also shortens the life of the battery.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that: the battery charging protection circuit is used for protecting a battery in a charging state.
In order to solve the technical problem, the utility model discloses a technical scheme be:
a battery charging protection circuit comprises a charging interface, a charging module, a temperature detection module and a micro control unit;
the output end of the charging interface is connected with the power input end of the charging module; the input end of the charging interface is used for being connected with a charger;
the power output end of the charging module is used for being connected with the positive electrode of the battery;
the output end of the temperature detection module is connected with the first input end of the micro control unit;
the output end of the micro control unit is connected with the control input end of the charging module;
the temperature detection module is used for detecting the surface temperature of the battery.
Further, the charging module comprises a charging chip and a protection control circuit;
the protection control circuit comprises a first resistor, a second resistor, a third resistor and a triode;
one end of the first resistor is connected with the output end of the micro control unit, and the other end of the first resistor is connected with the base electrode of the triode;
a collector of the triode is respectively connected with one end of the second resistor, one end of the third resistor and the control input end of the charging chip, and an emitter of the triode is grounded;
the other end of the second resistor is connected with the output end of the charging interface;
the other end of the third resistor is grounded;
and the power input end of the charging chip is connected with the output end of the charging interface.
Further, the charging module further comprises a fourth resistor and a fifth resistor;
one end of the fourth resistor is connected with the power supply input end of the charging chip, and the other end of the fourth resistor is respectively connected with one end of the fifth resistor and the second input end of the micro control unit;
the other end of the fifth resistor is grounded.
Further, the charging state indicating lamp is further included;
the positive electrode of the charging state indicator lamp is connected with the second output end of the micro control unit; the negative pole of the charging state indicator lamp is grounded;
and a third input end of the micro control unit is connected with a state display end of the charging chip.
Further, the temperature detection module comprises a thermistor, a sixth resistor and a first capacitor;
the thermistor is arranged on the surface of the battery;
one end of the thermistor is respectively connected with one end of the sixth resistor, one end of the first capacitor and the first input end of the micro control unit; the other end of the thermistor is grounded;
the other end of the sixth resistor is used for connecting a reference voltage;
the other end of the first capacitor is grounded.
Further, two groups of temperature detection modules are included;
the battery comprises two groups of sub batteries which are connected in series;
the thermistors of the two groups of temperature detection modules are respectively arranged on the surfaces of the sub-batteries.
Furthermore, the circuit also comprises a voltage stabilizing chip, a second capacitor and a third capacitor;
the input end of the voltage stabilizing chip is respectively connected with the anode of the battery and one end of the second capacitor;
the output end of the voltage stabilizing chip is respectively connected with the other end of the sixth resistor and one end of the third capacitor;
the other end of the second capacitor is grounded, and the other end of the third capacitor is grounded.
The beneficial effects of the utility model reside in that: the temperature of the surface of the battery is detected by the temperature detection module, the output end of the temperature detection module is connected with the first input end of the micro control unit, the control output end of the micro control unit is connected with the charging module, the temperature detection module transmits a temperature signal to the micro control unit when monitoring that the temperature of the surface of the battery is too high, the micro control unit acquires the temperature signal and outputs the control signal to stop the operation of the charging module, the problem that the battery is still charged by equipment when the temperature of the battery is too high, the battery is kept at a high temperature to influence the use of a user, and the service life of the battery is shortened is solved.
Drawings
Fig. 1 is a schematic diagram of a circuit module connection of a battery charging protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a charging module and a temperature detecting module of a battery charging protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a micro control unit circuit of a battery charging protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a voltage stabilizing chip of a battery charging protection circuit according to an embodiment of the present invention;
description of reference numerals:
1. a charging interface; 2. a charging module; 3. a temperature detection module; 4. a micro control unit; u4, a charging chip; r47 and a first resistor; r31 and a second resistor; r25 and a third resistor; q9, a triode; r16 and a fourth resistor; r17 and a fifth resistor; TH1/TH2, thermistor; R48/R46 and a sixth resistor; C28/C27, a first capacitor; u6, a micro control unit; u1, a voltage stabilizing chip; c1, a second capacitor; c2, a third capacitor; BT1/BT2 and a battery; d1, a charging state indicator lamp.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, a battery charging protection circuit includes a charging interface, a charging module, a temperature detection module, and a micro control unit;
the output end of the charging interface is connected with the power input end of the charging module; the input end of the charging interface is used for being connected with a charger;
the power output end of the charging module is used for being connected with the positive electrode of the battery;
the output end of the temperature detection module is connected with the first input end of the micro control unit;
the output end of the micro control unit is connected with the control input end of the charging module;
the temperature detection module is used for detecting the surface temperature of the battery.
As can be seen from the above description, the utility model has the advantages that: the temperature of the surface of the battery is detected by the temperature detection module, the output end of the temperature detection module is connected with the first input end of the micro control unit, the control output end of the micro control unit is connected with the charging module, when the temperature detection module monitors that the temperature of the surface of the battery is too high, the temperature signal can be transmitted to the micro control unit, the micro control unit outputs the control signal to stop the operation of the charging module after acquiring the temperature signal, so that the situation that the battery is still charged by equipment when the temperature of the battery is too high is avoided, the battery is kept at a high temperature to influence the use of a user, and the service life of the battery is shortened.
Further, the charging module comprises a charging chip and a protection control circuit;
the protection control circuit comprises a first resistor, a second resistor, a third resistor and a triode;
one end of the first resistor is connected with the output end of the micro control unit, and the other end of the first resistor is connected with the base electrode of the triode;
a collector of the triode is respectively connected with one end of the second resistor, one end of the third resistor and the control input end of the charging chip, and an emitter of the triode is grounded;
the other end of the second resistor is connected with the output end of the charging interface;
the other end of the third resistor is grounded;
and the power input end of the charging chip is connected with the output end of the charging interface.
According to the above description, the protection control circuit is composed of the first resistor, the second resistor, the third resistor and the triode, so that when the normal charging temperature of the circuit does not exceed the detection threshold, the triode is turned off, and when the temperature exceeds the detection threshold, the micro control unit outputs a high level to turn on the triode, so that the charging chip stops charging the battery forcibly, and the battery protection function is achieved.
Further, the charging module further comprises a fourth resistor and a fifth resistor;
one end of the fourth resistor is connected with the power supply input end of the charging chip, and the other end of the fourth resistor is respectively connected with one end of the fifth resistor and the second input end of the micro control unit;
the other end of the fifth resistor is grounded.
As can be seen from the above description, the charging detection circuit formed by the fourth resistor and the fifth resistor detects the operating state of the charging chip, so that the micro control unit can know the current state of the charging module.
Further, a charge status indicator light;
the positive electrode of the charging state indicator lamp is connected with the second output end of the micro control unit; the negative pole of the charging state indicator lamp is grounded;
and a third input end of the micro control unit is connected with a state display end of the charging chip.
As can be seen from the above description, the charging state indicator lamp is set, and the state of the charging chip is detected through the third input terminal of the micro control unit, so that the charging state indicator lamp is controlled to indicate in different ways by detecting different states of the charging chip.
Further, the temperature detection module comprises a thermistor, a sixth resistor and a first capacitor;
the thermistor is arranged on the surface of the battery;
one end of the thermistor is respectively connected with one end of the sixth resistor, one end of the first capacitor and the first input end of the micro control unit; the other end of the thermistor is grounded;
the other end of the sixth resistor is used for connecting a reference voltage;
the other end of the first capacitor is grounded.
As can be seen from the above description, the thermistor, the sixth resistor and the first capacitor are arranged to form the temperature detection module, and the thermistor is arranged on the surface of the battery, so that the temperature change of the battery can be detected to the greatest extent, and the accuracy of temperature detection is improved.
Further, two groups of temperature detection modules are included;
the battery comprises two groups of sub batteries which are connected in series;
the thermistors of the two groups of temperature detection modules are respectively arranged on the surfaces of the sub-batteries.
As can be seen from the above description, the thermistors of the two sets of temperature detection modules are respectively disposed on the surfaces of the set of sub-batteries, so as to respectively detect the temperature of each set of sub-batteries, and when the temperature of one set of sub-batteries reaches a threshold, the battery charging is forcibly stopped, thereby improving the protection of the two sets of sub-batteries.
Further, the circuit also comprises a voltage stabilizing chip, a second capacitor and a third capacitor;
the input end of the voltage stabilizing chip is respectively connected with the anode of the battery and one end of the second capacitor;
the output end of the voltage stabilizing chip is respectively connected with the other end of the sixth resistor and one end of the third capacitor;
the other end of the second capacitor is grounded, and the other end of the third capacitor is grounded.
According to the description, the voltage stabilizing module is formed by the voltage stabilizing chip, the second capacitor and the third capacitor, so that stable reference voltage can be output to the temperature detection module, and the accuracy of the temperature detection module for detecting the temperature of the battery is improved.
The above-mentioned battery charging protection circuit of this embodiment can be applicable to battery integration equipment application scenario, for example, the charging protection of equipment batteries such as cell-phone, flat board and intelligent bracelet explains through the detailed implementation mode below:
example one
Referring to fig. 1, a battery charging protection circuit includes a charging interface 1, a charging module 2, a temperature detection module 3, and a micro control unit U6 (MCU); the output end of the charging interface 1 is connected with the power input end of the charging module 2; the input end of the charging interface 1 is used for being connected with a charger; the power output end of the charging module 2 is used for being connected with the anode of the battery; the output end of the temperature detection module 3 is connected with the first input end of the micro control unit U6; the output end of the micro control unit U6 is connected with the control input end of the charging module 2; the temperature detection module 3 is used for detecting the surface temperature of the battery, and specifically:
referring to fig. 2, in an alternative embodiment, the charging interface 1 is a TYPE-C interface; if the charging interface 1 is applied to a USB or other interface scenes, the charging interface is a corresponding interface such as a USB interface; the charging module 2 comprises a charging chip U4 and a protection control circuit; the protection control circuit comprises a first resistor R47, a second resistor R31, a third resistor R25, a fourth resistor R16, a fifth resistor R17 and a triode Q3; one end of the first resistor R47 is connected with the output end (CHG _ EN) of the micro control unit U6, and the other end of the first resistor R47 is connected with the base electrode of the triode Q3; a collector of the triode Q3 is respectively connected with one end of the second resistor R31, one end of the third resistor R25 and a control input end (NTC) of the charging chip U4, and an emitter of the triode Q3 is grounded; the other end of the second resistor R31 is connected to the output end (VBUS) of the charging interface 1; the other end of the third resistor R25 is grounded; a power supply input end (VIN) of the charging chip U4 is connected with an output end of the charging interface 1 through a resistor R18; one end of the fourth resistor R16 is connected to the power input end of the charging chip U4, that is, to the output end (VBUS) of the charging interface 1, through a resistor R18, and the other end of the fourth resistor R16 is connected to one end of the fifth resistor R17 and the second input end (CHG) of the micro control unit U6, respectively; the other end of the fifth resistor R17 is grounded; the fourth resistor R16 and the fifth resistor R17 form a charging detection circuit, and when a 18 th pin (CHG) of the MCU detects the divided voltage of the fourth resistor R16 and the fifth resistor R17, the MCU indicates that the MCU is currently in a charging state;
the temperature detection module 3 comprises a thermistor, a sixth resistor and a first capacitor; the thermistor is arranged on the surface of the battery; one end of the thermistor is respectively connected with one end of the sixth resistor, one end of the first resistor and a first input end (NTC _ BAT1& NTC _ BAT 2) of the micro-control unit U6; the other end of the thermistor is grounded; the other end of the sixth resistor R48/R46 is used for connecting a reference voltage; the other end of the first capacitor is grounded; in an optional embodiment, the battery comprises two groups of sub-batteries, and the two groups of sub-batteries are connected in series; the temperature detection module comprises two groups of temperature detection modules 3, namely the thermistors TH1/TH2, a sixth resistor R48/R46 and a first capacitor C28/C27, which respectively form one group of temperature detection modules 3, and the thermistors TH1 and TH2 are respectively arranged on the surfaces of one group of sub-batteries;
referring to fig. 3, a charging status indicator lamp D1 is further included; the anode of the charging state indicator lamp D1 is connected with the second output end of the micro control unit U6; the negative electrode of the charging state indicator lamp D1 is grounded; a third input end (STAT) of the micro control unit U6 is connected with a state display end (STAT) of the charging chip U4; the other pins of the micro control unit U6 are connected according to specific design requirements;
referring to fig. 4, the device further includes a voltage stabilizing chip U1, a second capacitor C1, and a third capacitor C2; an input end (IN) of the voltage stabilizing chip U1 is respectively connected with the anode of the battery and one end of the second capacitor C1; an output end (OUT) of the voltage stabilizing chip U1 is respectively connected with the other end of the sixth resistor R48/R46 and one end of the third capacitor C2, and 5V reference voltage is output; the other end of the second capacitor C1 is grounded, and the other end of the third capacitor C2 is grounded; the circuit also comprises other diodes, resistors and capacitor devices so that the circuit can work normally;
the working principle of the battery charging protection circuit is as follows:
when an external power supply supplies power to a charging module 2 consisting of the charging chip U4 through a TYPE-C interface, after the charging chip U4 starts to work, the charging module 2 charges a battery BT1 and a battery BT 2; after the micro control unit U6 detects the divided voltage of the fourth resistor R16 and the fifth resistor R17, the charging state indicator lamp D1 is turned on, and the state display end of the charging chip U4 starts to be detected, if the state display end is at a low level, the micro control unit U6 outputs a frequency of 1Hz to enable the charging state indicator lamp D1 to flicker; when the charging is started, the charging chip U4 is charged in a constant current mode, and when the voltages of the battery BT1 and the battery BT2 reach an overcharge voltage, the charging is carried out in a constant voltage mode; when the battery BT1 and the battery BT2 are fully charged, the state display end of the charging chip U4 is switched to a high level, and the micro control unit U6 controls the charging chip U4 to stop charging after detecting a high level signal and outputs the high level to enable the charging state indicator lamp D1 to be normally on;
meanwhile, the two groups of temperature detection modules 3 respectively sample the temperatures of the battery BT1 and the battery BT2 in the charging process; if the temperature detection module 3 detects that the temperature of a group of batteries BT1/BT2 exceeds a threshold value or the temperatures of the batteries BT1 and BT2 both exceed a threshold value in the charging state, the output end (CHG _ EN) of the micro control unit U6 outputs a high level, so that the triode Q3 is turned on, the voltage of the control input end of the charging chip U4 is pulled down, and the battery charging is forcibly stopped, thereby achieving the purpose of protecting the batteries.
The above mentioned is only the embodiment of the present invention, and the patent scope of the present invention is not limited thereby, and all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (7)
1. A battery charging protection circuit is characterized by comprising a charging interface, a charging module, a temperature detection module and a micro control unit;
the output end of the charging interface is connected with the power input end of the charging module; the input end of the charging interface is used for being connected with a charger;
the power output end of the charging module is used for being connected with the positive electrode of the battery;
the output end of the temperature detection module is connected with the first input end of the micro control unit;
the output end of the micro control unit is connected with the control input end of the charging module;
the temperature detection module is used for detecting the surface temperature of the battery.
2. The battery charging protection circuit of claim 1, wherein the charging module comprises a charging chip and a protection control circuit;
the protection control circuit comprises a first resistor, a second resistor, a third resistor and a triode;
one end of the first resistor is connected with the output end of the micro control unit, and the other end of the first resistor is connected with the base electrode of the triode;
a collector of the triode is respectively connected with one end of the second resistor, one end of the third resistor and the control input end of the charging chip, and an emitter of the triode is grounded;
the other end of the second resistor is connected with the output end of the charging interface;
the other end of the third resistor is grounded;
and the power input end of the charging chip is connected with the output end of the charging interface.
3. The battery charging protection circuit of claim 2, wherein the charging module further comprises a fourth resistor and a fifth resistor;
one end of the fourth resistor is connected with the power supply input end of the charging chip, and the other end of the fourth resistor is respectively connected with one end of the fifth resistor and the second input end of the micro control unit;
the other end of the fifth resistor is grounded.
4. The battery charge protection circuit of claim 2, further comprising a charge status indicator light;
the positive electrode of the charging state indicator lamp is connected with the second output end of the micro control unit; the negative pole of the charging state indicator lamp is grounded;
and a third input end of the micro control unit is connected with a state display end of the charging chip.
5. The battery charging protection circuit of claim 1, wherein the temperature detection module comprises a thermistor, a sixth resistor and a first capacitor;
the thermistor is arranged on the surface of the battery;
one end of the thermistor is respectively connected with one end of the sixth resistor, one end of the first capacitor and the first input end of the micro control unit; the other end of the thermistor is grounded;
the other end of the sixth resistor is used for connecting a reference voltage;
the other end of the first capacitor is grounded.
6. The battery charging protection circuit of claim 5, comprising two sets of said temperature detection modules;
the battery comprises two groups of sub batteries which are connected in series;
the thermistors of the two groups of temperature detection modules are respectively arranged on the surfaces of the sub-batteries.
7. The battery charging protection circuit of claim 6, further comprising a voltage regulator chip, a second capacitor and a third capacitor;
the input end of the voltage stabilizing chip is respectively connected with the anode of the battery and one end of the second capacitor;
the output end of the voltage stabilizing chip is connected with the other end of the sixth resistor and one end of the third capacitor respectively;
the other end of the second capacitor is grounded, and the other end of the third capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222549910.8U CN218276168U (en) | 2022-09-26 | 2022-09-26 | Battery charging protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222549910.8U CN218276168U (en) | 2022-09-26 | 2022-09-26 | Battery charging protection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN218276168U true CN218276168U (en) | 2023-01-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222549910.8U Active CN218276168U (en) | 2022-09-26 | 2022-09-26 | Battery charging protection circuit |
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| CN (1) | CN218276168U (en) |
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- 2022-09-26 CN CN202222549910.8U patent/CN218276168U/en active Active
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Effective date of registration: 20230508 Address after: Room 401, No. 73 Huli Industrial Park, Meixi Road, Tong'an District, Xiamen City, Fujian Province, 361100 Patentee after: Xiamen Wanxiexing Electronic Technology Co.,Ltd. Address before: Unit 305, No. 1702, Gangzhong Road, Xiamen area, China (Fujian) pilot Free Trade Zone, Xiamen, Fujian 361000 Patentee before: Xiamen youbaishi Electronic Technology Co.,Ltd. |
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Effective date of registration: 20231027 Address after: Unit 401, No. 1708 Gangzhong Road, Xiamen Area, China (Fujian) Pilot Free Trade Zone, Xiamen City, Fujian Province, 361000 Patentee after: Xiamen youbaishi Electronic Technology Co.,Ltd. Address before: Room 401, No. 73 Huli Industrial Park, Meixi Road, Tong'an District, Xiamen City, Fujian Province, 361100 Patentee before: Xiamen Wanxiexing Electronic Technology Co.,Ltd. |
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