Balanced charging circuit for controlling battery switching based on MOS

Abstract

The utility model relates to a balanced charging circuit based on MOS control battery switching, which comprises a main control chip, a charging chip, a plurality of batteries, a double PMOS chip and a double NMOS chip, the batteries are connected with the positive electrode of the charging chip through the double PMOS chip, the batteries are connected with the negative electrode of the charging chip through the double NMOS chip, the plurality of batteries are connected in parallel, and the main control chip is connected with the charging chip through the double NMOS chip. The main control chip is connected with the charging chip and the battery, and when the level of a serial port, connected with the battery, on the main control chip is high, the battery is charged. As only a common single battery is needed to charge the IC in the circuit, the technical requirement is very low, the corresponding cost is also low, and meanwhile, the serial number can be expanded only by adding the PMOS and the NMOS according to the balance principle, so that the circuit is very suitable for popularization and application.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery charging technical field especially relates to a balanced charging circuit based on MOS control battery switching. BACKGROUND

[0002] The current multi-string battery balance charging principle is mainly through boosting the input voltage to the voltage of the multi-string battery, and then simultaneously charging the whole string battery. When detecting that the whole string battery is about to be fully charged, the voltage of each independent battery is detected by software, and the charging current of the corresponding battery is adjusted according to the voltage, so as to achieve the purpose of simultaneous charging of each independent battery, that is, balanced charging. The professional balance charging equipment currently needs to adjust the voltage for different string numbers of batteries, and the software algorithm needs to be involved when the battery is about to be fully charged, and the charging current needs to be dynamically adjusted. The technical difficulty is very high, and it is not friendly to ordinary design. SUMMARY

[0003] The utility model provides a balanced charging circuit based on MOS control battery switching, which aims at solving the problem of difficulty in adjusting the charging current and the charging battery of the existing balanced charging circuit.

[0004] The utility model provides a balanced charging circuit based on MOS control battery switching, which includes main control chip, charging chip, a plurality of batteries, double PMOS chip and double NMOS chip, the positive pole of battery is connected with the charging chip through double PMOS chip, the negative pole of battery is connected with the charging chip through double NMOS chip, a plurality of batteries are parallelly connected, and the main control chip is connected with the charging chip and battery, when the serial port level of the main control chip connected with battery is high, battery charges.

[0005] As a further improvement of the utility model, the positive pole of the battery is connected with the double PMOS chip, the 1 pin of the double PMOS chip is connected with the positive pole of the charging chip, the 2 and 4 pins of the double PMOS chip are connected with the collector of the triode Qn, the emitter of the triode Qn is grounded, and the base of the triode Qn is connected with the main control chip.

[0006] As a further improvement of the utility model, the negative pole of the battery is connected with the double NMOS chip, the 1 pin of the double NMOS chip is connected with the interface J2 of the negative pole of the charging chip, and the 2 and 4 pins of the double NMOS chip are connected with the main control chip.

[0007] As a further improvement of the utility model, the 6 and 8 pins of the charging chip are connected with the 12 pin of the main control chip, the 6 and 8 pins of the charging chip are connected with the 1 pin of the double PMOS chip, and the 12 pin of the main control chip detects the charging voltage of the battery.

[0008] As a further improvement of the utility model, the 11th pin of the main control chip is connected with the 3rd pin of the charging chip, and the 11th pin of the main control chip detects whether the battery is fully charged.

[0009] As a further improvement of the utility model, the 9th pin of the main control chip is connected with the base of the triode Q1, the collector of the triode Q1 is connected with the 5th pin of the charging chip, and the emitter of the triode Q1 is grounded.

[0010] As a further improvement of the utility model, the 10th pin of the main control chip is connected with the 4th pin of the charging chip, and the 10th pin of the main control chip detects whether the battery is connected.

[0011] As a further improvement of the utility model, the utility model further includes a light emitting diode, the positive electrode of the light emitting diode is connected with the 15th pin of the main control chip, the negative electrode of the light emitting diode is connected with one end of the resistor R25, and the other end of the resistor R25 is grounded.

[0012] As a further improvement of the utility model, the utility model further includes a TypeC female seat and a voltage conversion chip, the TypeC female seat is connected with an external power supply, outputs 5V voltage to the 3rd pin of the voltage conversion chip, and the 2nd pin of the voltage conversion chip outputs 3.3V voltage to the 6th pin of the main control chip.

[0013] As a further improvement of the utility model, the 1st pin of the charging chip is connected with 5V voltage.

[0014] The utility model discloses a circuit connection drawing. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The utility model discloses a circuit connection drawing. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is in combination with the drawings and example, and the utility model is further explained in detail.

[0017] The utility model discloses a kind of balanced charging circuit based on MOS control battery switching, including main control chip, charging chip, several batteries, double PMOS chip and double NMOS chip, battery is connected with the anode of charging chip by double PMOS chip, battery is connected with the cathode of charging chip by double NMOS chip, several batteries are parallelly connected, main control chip is connected with charging chip and battery, when the serial port level of main control chip and battery connection is placed high, battery is charged.

[0018] As an embodiment of the utility model, the positive pole of the battery is connected with the double PMOS chip, the 1 pin of the double PMOS chip is connected with the positive pole of the charging chip, the 2, 4 pins of the double PMOS chip are connected with the collector of the triode Qn, the emitter of the triode Qn is grounded, and the base of the triode Qn is connected with the main control chip.

[0019] As another embodiment of the utility model, the negative pole of the battery is connected with the double NMOS chip, the 1 pin of the double NMOS chip is connected with the interface J2 of the negative pole of the charging chip, and the 2, 4 pins of the double NMOS chip are connected with the main control chip.

[0020] As another embodiment of the utility model, the 6, 8 pins of the charging chip are connected with the 12 pin of the main control chip, the 6, 8 pins of the charging chip are connected with the 1 pin of the double PMOS chip, and the 12 pin of the main control chip detects the charging voltage of the battery.

[0021] As another embodiment of the utility model, the 11 pin of the main control chip is connected with the 3 pin of the charging chip, and the 11 pin of the main control chip detects whether the battery is charged.

[0022] As another embodiment of the utility model, the 9 pin of the main control chip is connected with the base of the triode Q1, the collector of the triode Q1 is connected with the 5 pin of the charging chip, and the emitter of the triode Q1 is grounded.

[0023] As another embodiment of the utility model, the 10 pin of the main control chip is connected with the 4 pin of the charging chip, and the 10 pin of the main control chip detects whether the battery is connected.

[0024] As another embodiment of the utility model, the utility model further includes a light emitting diode, the positive pole of the light emitting diode is connected with the 15 pin of the main control chip, the negative pole of the light emitting diode is connected with one end of the resistance R25, and the other end of the resistance R25 is grounded.

[0025] As another embodiment of the utility model, the utility model further includes a TypeC female seat (J1 in Figure 1 ) and a voltage conversion chip (U6 in Figure 1 ), the TypeC female seat is connected with an external power supply, outputs 5V voltage to the 3 pin of the voltage conversion chip, and the 2 pin of the voltage conversion chip outputs 3.3V voltage to the 6 pin of the main control chip. Figure 1 The voltage conversion chip is the chip U5 in , 5V voltage is connected through the TypeC female seat, is converted to 3.3V through the voltage conversion chip, and provides 5V and 3.3V two working voltages for the circuit.

[0026] As another embodiment of the utility model, the 1 pin of the charging chip is connected with 5V voltage.

[0027] The utility model provides a kind of balanced charging circuit based on MOS control battery switching, using main control chip control MOS tube's opening and closing, to carry out segmentation to multiple battery pairs, ensure that only one battery is connected to charging circuit at any time.Reusing single battery charging management chip, the battery of access is charged.When charging is full, the next battery is switched into charging loop for charging by MOS, until all batteries are fully charged, i.e.

[0028] The following three batteries are described as an embodiment, and the principle is the same for more than three batteries, just need to increase the corresponding MOS tube and control signal.

[0029] As Figure 1 As shown in each battery positive pole is adopted double PMOS chip series connection to the positive pole of charging chip, negative pole is adopted double NMOS chip series connection to the negative pole of charging chip. Thus ensure that the pin of main control chip and battery connection, i.e. CTR_1, CTR_2, CTR_3 is low, each battery will be in completely independent state, and opening any signal in CTR_1, CTR_2, CTR_3 can connect corresponding battery to charging circuit. When main control chip (chip U2 in Figure 1 After power-on, first set high CHARG_EN signal (9 pin of main control chip), close charging chip, set high CTR_3 pin first, connect the highest bit battery into charging loop, then set low CHARG_EN signal, let charging loop work, at this time, main control chip detects CHARG signal (10 pin of main control chip) whether low, low indicates that there is battery, i.e. the number of battery string is three. If high, it indicates that there is no battery access, at this time, set high CHARG_EN signal again, set low CTR_3, set high CTR_2, set low CHARG_EN signal again, detect CHARG signal whether low, to confirm whether battery is two strings, if high, use the same operation to detect whether battery is one string, until the number of battery string is finally confirmed. Through the control of part of pin of main control chip, the number of battery connected to charging circuit can be confirmed, which is convenient for subsequent charging operation.

[0030] In the above step operation, it is assumed that the number of battery string is three. Set CHARG_EN low and CTR_3 high to charge battery, at the same time, main control chip detects voltage of battery through BAT_ADC (12 pin of main control chip) in real time, to ensure that charging works normally. When battery is fully charged, the next battery is switched into charging loop for charging by MOS, until all batteries are fully charged, i.e. Figure 1The chip U1 in the circuit will set the STDBY (pin 3 of the charging chip) from high to low to inform the master control chip that the charging is completed. The master control chip charges the second battery by setting CHARG_EN high, CTR_3 low, CTR_2 high, and CHARG_EN low, and then confirms whether the second battery is fully charged in the same way. The first battery is also charged in the same way. When the first battery is also fully charged, it indicates that each battery in the whole string of batteries is fully charged, and the master control chip can make the light-emitting diode light up by setting the LED signal pin high to indicate that the charging is completed. After the string of batteries is fully charged, the circuit can automatically switch to the next string of batteries for charging, and the charging voltage can be monitored in real time. It is not difficult to adjust the charging current and the charging battery, and the charging effect is better and safer.

[0031] The above is a further detailed description of the utility model in combination with specific preferred embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, without departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them should be regarded as belonging to the protection scope of the utility model.

Claims

1. A MOS-based control cell switching balancing charging circuit, characterized in that, It includes master control chip, charging chip, several batteries, double PMOS chip and double NMOS chip, the battery is connected with the positive pole of the charging chip through the double PMOS chip, the battery is connected with the negative pole of the charging chip through the double NMOS chip, the several batteries are connected in parallel, the master control chip is connected with the charging chip and the battery, when the serial port level on the master control chip connected with the battery is high, the battery is charged.

2. A MOS control cell switching based balancing charging circuit according to claim 1, characterized in that, The positive pole of the battery is connected with the double PMOS chip, the 1 pin of the double PMOS chip is connected with the positive pole of the charging chip, the 2 and 4 pins of the double PMOS chip are connected with the collector of the transistor Qn, the emitter of the transistor Qn is grounded, and the base of the transistor Qn is connected with the master control chip.

3. The MOS control cell switching based balancing charging circuit according to claim 1, characterized in that, The negative pole of the battery is connected with the double NMOS chip, the 1 pin of the double NMOS chip is connected with the interface J2 of the negative pole of the charging chip, and the 2 and 4 pins of the double NMOS chip are connected with the master control chip.

4. The MOS control cell switching based balancing charging circuit according to claim 1, characterized in that, The 6 and 8 pins of the charging chip are connected with the 12 pin of the master control chip, and the 6 and 8 pins of the charging chip are connected with the 1 pin of the double PMOS chip, and the 12 pin of the master control chip detects the charging voltage of the battery.

5. The MOS control cell switching based balancing charging circuit according to claim 1, characterized in that, The 11 pin of the master control chip is connected with the 3 pin of the charging chip, and the 11 pin of the master control chip detects whether the battery is fully charged.

6. The MOS control cell switching based balancing charging circuit according to claim 1, characterized in that, The 9 pin of the master control chip is connected with the base of the transistor Q1, the collector of the transistor Q1 is connected with the 5 pin of the charging chip, and the emitter of the transistor Q1 is grounded.

7. The MOS control cell switching based balancing charging circuit according to claim 1, characterized in that, The 10 pin of the master control chip is connected with the 4 pin of the charging chip, and the 10 pin of the master control chip detects whether the battery is connected.

8. The MOS control cell switching based balancing charging circuit according to claim 1, characterized in that, It also includes a light emitting diode, the positive pole of the light emitting diode is connected with the 15 pin of the master control chip, the negative pole of the light emitting diode is connected with one end of the resistor R25, and the other end of the resistor R25 is grounded.

9. The MOS control cell switching based balancing charging circuit according to claim 1, characterized in that, It also includes a TypeC female socket and a voltage conversion chip, the TypeC female socket is connected with an external power supply, outputs 5V voltage to the 3 pin of the voltage conversion chip, and the 2 pin of the voltage conversion chip outputs 3.3V voltage to the 6 pin of the master control chip.

10. The MOS control cell switching based balancing charging circuit according to claim 1, characterized in that, The 1 pin of the charging chip is connected with 5V voltage.

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