CN216981562U - Charging protection circuit for reducing battery pack full-charge standby loss - Google Patents
Charging protection circuit for reducing battery pack full-charge standby loss Download PDFInfo
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- CN216981562U CN216981562U CN202220104860.XU CN202220104860U CN216981562U CN 216981562 U CN216981562 U CN 216981562U CN 202220104860 U CN202220104860 U CN 202220104860U CN 216981562 U CN216981562 U CN 216981562U
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Abstract
The utility model discloses a charging protection circuit for reducing the standby loss of full charge of a battery pack, which comprises: the input module, first protection switch module, supplementary protection control module, second protection switch module and the output module that connects gradually, wherein, first protection switch module is connected the main control protection module with second protection switch module, be provided with MOS pipe Q2 and LED diode in the first protection switch module, be provided with MOS pipe Q1 in the second protection switch module, low potential pin 1 is connected with MOS pipe Q1, Q2 through diode D4, D5 respectively in the main control protection module. The first protection switch module and the second protection switch module are respectively arranged behind the input module and in front of the output module, and the MOS tubes Q1 and Q2 are controlled to work by a low potential pin 1 in the main control protection module according to the voltage of the battery, so that the first protection switch module and the second protection switch module are simultaneously disconnected after the battery is fully charged, the whole charger has no input voltage, and further has no standby loss.
Description
The technical field is as follows:
the utility model relates to the field of chargers, in particular to a charging protection circuit for reducing standby loss caused by full charging of a battery pack.
Background art:
in the existing chargers in the market, a boost charging circuit is usually added to charge the battery, but the general boost circuit is obtained by dividing the voltage by using a resistor on an FB pin of an IC. The accuracy of the resistor plus the accuracy of the pin FB of the IC may result in a too low or too high voltage, which may affect the life of the battery. Secondly, the conventional charger enters a standby state after the battery is fully charged, and although the battery has no voltage input at this time, the IC still has an input voltage, so that a certain static current exists in the charger, and unnecessary standby loss is generated.
In view of the above, the present inventors propose the following.
The utility model has the following contents:
the utility model aims to overcome the defects of the prior art and provides a charging protection circuit for reducing the standby loss of full charge of a battery pack.
In order to solve the technical problems, the utility model adopts the following technical scheme: a charge protection circuit for reducing standby loss of full charge of a battery pack comprises: input module, first protection switch module, supplementary protection control module, second protection switch module and the output module that connects gradually, wherein, first protection switch module with the master control protection module is connected to second protection switch module, be provided with MOS pipe Q2 and LED diode in the first protection switch module, be provided with MOS pipe Q1 in the second protection switch module, low potential pin 1 in the master control protection module respectively through diode D4 and diode D5 with MOS pipe Q1 with MOS pipe Q2 connects.
Further, in the above technical solution, the auxiliary protection control module includes a control chip U1, and the main control protection module includes a control chip U31.
Further, in the above technical solution, the model of the control chip U1 is SC8922A, and the model of the control chip U31 is S8223 CAF.
Further, in the above technical solution, the gate G of the MOS transistor Q2 is connected to the diode D5 through a resistor R15, the drain D of the MOS transistor Q2 is connected to the auxiliary protection control module, the drain D of the MOS transistor Q2 is further connected to the LED diode through a resistor R16, and the source S of the MOS transistor Q2 is connected to the input module; the first protection switch module further includes a resistor R14 and a diode D3 connected in parallel to the gate G and the source S of the MOS transistor Q2.
Further, in the above technical solution, the gate G of the MOS transistor Q1 is connected to the diode D4 through a resistor R12, the drain D of the MOS transistor Q1 is connected to the output module, and the source S of the MOS transistor Q2 is connected to the auxiliary protection control module; the first protection switch module further includes a resistor R11 and a diode D2 connected in parallel to the gate G and the source S of the MOS transistor Q2.
Further, in the above technical solution, the input module is a USB TYPE-C interface, and the output module is connected to 3 18650 lithium batteries to form a three-section series battery pack.
After adopting the technical scheme, compared with the prior art, the utility model has the following beneficial effects: according to the utility model, the first protection switch module and the second protection switch module are respectively arranged behind the input module and in front of the output module, and the low potential pin 1 in the main control protection module controls the MOS transistor Q1 and the MOS transistor Q2 to work according to the voltage of the battery, so that the first protection switch module and the second protection switch module are simultaneously disconnected after the battery is fully charged, and the auxiliary protection control module and the main control protection module have no input voltage and further have no static current, therefore, the charger cannot enter a standby mode, no standby power is generated, and no standby loss exists.
Description of the drawings:
FIG. 1 is a circuit diagram of the present invention;
FIG. 2 is a circuit diagram of a first protection switch module of the present invention;
FIG. 3 is a circuit diagram of a second protection switch module of the present invention;
fig. 4 is a circuit diagram of the master protection module of the present invention.
The specific implementation mode is as follows:
the utility model is further illustrated below with reference to specific embodiments and the accompanying drawings.
Referring to fig. 1 to 4, a charging protection circuit for reducing standby loss of a fully charged battery pack includes: input module 1, first protection switch module 2, supplementary protection control module 3, second protection switch module 4 and output module 5 that connect gradually, wherein, first protection switch module 2 with second protection switch module 4 connects master control protection module 6, be provided with MOS pipe Q2 and LED diode in the first protection switch module 2, be provided with MOS pipe Q1 in the second protection switch module 4, low potential pin 1 passes through diode D4 and diode D5 respectively in the master control protection module 6 with MOS pipe Q1 with MOS pipe Q2 connects. Through set up first protection switch module 2 and second protection switch module 4 respectively behind input module 1 and before output module 5 to control MOS pipe Q1 and MOS pipe Q2 work according to battery voltage by the low potential pin 1 in the main control protection module 6, make first protection switch module 2 and second protection switch module 4 break off the circuit simultaneously after the battery is full of, supplementary protection control module 3 and main control protection module 6 all do not have input voltage, and then do not have quiescent current, therefore, the charger can not get into standby mode, do not produce standby power, no standby loss.
The auxiliary protection control module 3 comprises a control chip U1, and the main control protection module 6 comprises a control chip U31. The model of the control chip U1 is SC8922A, and the model of the control chip U31 is S8223 CAF. The protection voltage of the control chip U31 is 4.15V. When the battery voltage is less than 4.15V, the control chip U31 enters the working state, and when the battery voltage reaches 4.15V, the control chip U31 further stops working in the protection state.
The control chip U1 of the auxiliary protection control module 3 adopts SC8922A, so that the auxiliary protection control module is suitable for a boost switch type charger for 2-3 lithium battery applications. The SC8922A integrates 3 power transistors therein, which can greatly reduce the application design of customers, save cost, reduce PCB Space, and have ultra-high efficiency, and can boost the input voltage of 4.5V-5.5V to 16V, and provide perfect charge cycle management, and a user can detect the voltage of each battery by including 3 parallel battery packs for different application scenarios, but the power level SC8922A has no reliability and safety of a dedicated lithium battery protection chip, so in order to improve the safety and reliability of the lithium battery pack, the master protection module 6 is added, wherein the control chip U31 is S8223CAF, the output is Open-drain mode, and the MOS transistor Q1 is P-MOS transistor.
The gate G of the MOS transistor Q2 is connected to the diode D5 through a resistor R15, the drain D of the MOS transistor Q2 is connected to the auxiliary protection control module 3, the drain D of the MOS transistor Q2 is further connected to the LED diode through a resistor R16, and the source S of the MOS transistor Q2 is connected to the input module 1; the first protection switch module 2 further includes a resistor R14 and a diode D3 connected in parallel to the gate G and the source S of the MOS transistor Q2.
The gate G of the MOS transistor Q1 is connected to the diode D4 through the resistor R12, the drain D of the MOS transistor Q1 is connected to the output module 5, and the source S of the MOS transistor Q2 is connected to the auxiliary protection control module 3; the first protection switch module 2 further includes a resistor R11 and a diode D2 connected in parallel to the gate G and the source S of the MOS transistor Q2.
The input module 1 is a USB TYPE-C interface, and the output module 5 is connected with 3 18650 lithium batteries to form a three-section series battery pack.
In summary, when the battery voltage is less than 4.15V, the pin 1 of the U31 is at low potential, the MOS transistor Q2 Vg-s goes through the diode D5 to the pin 1 of the low potential of the U31, the MOS transistor Q2 is turned on, and an input voltage is provided to the U1, so that the U1 IC operates, and the MOS transistor Q1 Vg-s goes through the diode D4 to the pin 1 of the low potential of the U31, so as to charge the battery. When each battery is charged to 4.15V, the 1 st pin of the U31 is at a high potential, the MOS transistor Q1 and the MOS transistor Q2 stop acting, the battery pack is stopped being charged, and the function of battery pack charging protection is further achieved, and after the MOS transistor Q2 is disconnected, the LED diode is not bright, and the lithium battery is fully charged. After that, the battery voltage is less than 4.15V and enters a charging cycle again after the battery pack is used. During charging, firstly, the U1 IC detects the charging voltage of each battery, the U1 detects that each voltage of the battery enters into the charging cycle control until the charging stops, but if the U1 detects a fault, the second protection U31 continues the charging monitoring, when detecting that the battery voltage reaches 4.25V, the 1 st pin of the U31 becomes high to turn off the Q1, which is the dual battery overcharge protection mechanism. After the scheme is adopted, when the battery is fully charged, the MOS transistor Q2 stops acting, the U1 represents no input voltage, the static current is completely absent, the standby mode cannot be entered, and the main advantage is that the input work rate of the whole charging equipment is reduced when the battery is fully charged, namely the standby power is reduced.
It should be understood that the above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention, which is defined by the appended claims.
Claims (6)
1. A charging protection circuit for reducing standby loss of full charge of a battery pack, comprising: input module (1), first protection switch module (2), supplementary protection control module (3), second protection switch module (4) and output module (5) that connect gradually, wherein, first protection switch module (2) with master control protection module (6) is connected in second protection switch module (4), be provided with MOS pipe Q2 and LED diode in first protection switch module (2), be provided with MOS pipe Q1 in second protection switch module (4), low potential pin 1 in master control protection module (6) respectively through diode D4 and diode D5 with MOS pipe Q1 with MOS pipe Q2 connects.
2. The charging protection circuit for reducing standby loss during full charge of a battery pack according to claim 1, wherein: the auxiliary protection control module (3) comprises a control chip U1, and the main control protection module (6) comprises a control chip U31.
3. The charging protection circuit for reducing standby loss during full charge of a battery pack according to claim 2, wherein: the model of the control chip U1 is SC8922A, and the model of the control chip U31 is S8223 CAF.
4. A charge protection circuit for reducing standby loss during full charge of a battery pack according to any one of claims 1 to 3, wherein: the grid G of the MOS tube Q2 is connected with the diode D5 through a resistor R15, the drain D of the MOS tube Q2 is connected with the auxiliary protection control module (3), the drain D of the MOS tube Q2 is also connected with the LED diode through a resistor R16, and the source S of the MOS tube Q2 is connected with the input module (1); the first protection switch module (2) further comprises a resistor R14 and a diode D3 which are connected in parallel with the gate G and the source S of the MOS transistor Q2.
5. A charge protection circuit for reducing standby loss due to full charge of a battery pack according to any one of claims 1 to 3, wherein: the grid G of the MOS tube Q1 is connected with the diode D4 through a resistor R12, the drain D of the MOS tube Q1 is connected with the output module (5), and the source S of the MOS tube Q2 is connected with the auxiliary protection control module (3); the first protection switch module (2) further comprises a resistor R11 and a diode D2 which are connected in parallel with the gate G and the source S of the MOS transistor Q2.
6. The charging protection circuit for reducing standby loss due to full charge of a battery pack according to claim 1, wherein: the input module (1) is a USB TYPE-C interface, and the output module (5) is connected with 3 18650 lithium batteries to form a three-section series battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220104860.XU CN216981562U (en) | 2022-01-14 | 2022-01-14 | Charging protection circuit for reducing battery pack full-charge standby loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220104860.XU CN216981562U (en) | 2022-01-14 | 2022-01-14 | Charging protection circuit for reducing battery pack full-charge standby loss |
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| CN216981562U true CN216981562U (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220104860.XU Active CN216981562U (en) | 2022-01-14 | 2022-01-14 | Charging protection circuit for reducing battery pack full-charge standby loss |
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| CN (1) | CN216981562U (en) |
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- 2022-01-14 CN CN202220104860.XU patent/CN216981562U/en active Active
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