Balanced battery charging system for correcting reference voltage based on control circuit

Abstract

The utility model discloses an equalized battery charging system based on reference voltage correction of a control circuit. The equalized battery charging system comprises a charger and a battery pack connected with the charger, the battery pack is formed by connecting a plurality of batteries in series, and each battery is connected with a control circuit in parallel; the control circuit comprises a single-chip microcomputer U1, a resistor R1, a resistor R2, a resistor R3 and a resistor R4. A pin 1 of the single-chip microcomputer U1 is connected with a 3V power supply, a pin 3 is connected with one ends of the resistor R1, the resistor R2 and the resistor R3, a pin 4 is connected with the other ends of the resistor R1, the resistor R2 and the resistor R3, a pin 5 is connected with a positive electrode of a battery, and a pin 8 and a negative electrode of the battery are grounded. The other ends of the resistor R1, the resistor R2 and the resistor R3 are connected with one end of a resistor R4, and the other end of the resistor R4 is grounded.

Description

Technical Field

[0001] The utility model relates to the field of lead-acid battery charging, and specifically to an equalizing battery charging system based on a control circuit for correcting a reference voltage. Background Art

[0002] A storage battery is a device that converts chemical energy into electrical energy and is a rechargeable battery designed according to the principle of rechargeability.

[0003] The charging of the battery is achieved through a reversible chemical reaction, usually referring to a lead-acid battery, which is a common rechargeable battery.

[0004] It is usually composed of multiple single cells, and each single cell includes positive and negative plates, separators, electrolytes, and containers.

[0005] However, with the increase in the number of cycles, due to sulfation and the shedding of active substances, the performance of the battery will gradually decline.

[0006] During the charging process of a multi-section lead-acid battery, when charging the battery pack with the same voltage, it is necessary to consider equalizing the charging of batteries with different capacities. Therefore, it is necessary to propose a charging system for the battery pack to complete the on-off of the charging branch during charging and achieve the effect of equalizing the battery charging, which is a problem that needs to be solved currently. Summary of the Utility Model

[0007] Purpose of the utility model: To provide an equalizing battery charging system based on a control circuit for correcting a reference voltage to solve the above problems existing in the prior art.

[0008] Technical solution: An equalizing battery charging system based on a control circuit for correcting a reference voltage, comprising:

[0009] A charger and a battery pack connected to the charger;

[0010] The battery pack is formed by connecting multiple batteries in series, and a control circuit is connected in parallel to each battery;

[0011] The control circuit includes:

[0012] A single-chip microcomputer U1, a resistor R1, a resistor R2, a resistor R3, and a resistor R4;

[0013] The pin 1 of the single-chip microcomputer U1 is connected to a 3V power supply, the pin 3 is connected to one ends of the resistor R1, the resistor R2, and the resistor R3, the pin 4 is connected to the other ends of the resistor R1, the resistor R2, and the resistor R3, the pin 5 is connected to the positive electrode of the battery, and the pins 8 and the negative electrode of the battery are grounded;

[0014] The other ends of the resistor R1, the resistor R2, and the resistor R3 are connected to one end of the resistor R4, and the other end of the resistor R4 is grounded.

[0015] This utility model determines the reference voltage by means of a circuit. A reference voltage has been written inside the single-chip microcomputer U1, but there will be deviations in the actual voltage. Therefore, it is necessary to correct the reference voltage. The reference voltage is corrected by different voltage divisions of different resistors. The single-chip microcomputer U1 determines whether to remove resistor R1, R2 or R3 based on the error between the actual standard voltage and the internal reference voltage of the single-chip microcomputer, so as to correct the reference voltage, and compares the corrected reference voltage with the voltage collected after the battery starts charging to determine whether the battery is fully charged;

[0016] When it is fully charged, switch a disconnects the first charging branch, and switch b turns on the second charging branch to continue charging the subsequent batteries, which can stop charging in time after the battery is fully charged to prevent overcharging, and thus achieve the effect of balanced charging of the battery pack.

[0017] In a further embodiment, the control circuit further includes:

[0018] The first charging branch is connected to the negative electrode of the battery, and a switch a is provided on the first charging branch;

[0019] The second charging branch is connected to one end of the first charging branch, and the other end is connected to the positive electrode of the battery, and a switch b is provided on the second charging branch.

[0020] In a further embodiment, the connection position of the second charging branch and the first charging branch is at the front end of switch a.

[0021] In a further embodiment, when multiple batteries are connected in series, the first charging branch of the first battery and the second charging branch of the last battery are connected to the charger.

[0022] In a further embodiment, switch b is the inverse of switch a.

[0023] In a further embodiment, pin 7 of the single-chip microcomputer U1 is connected to switch a, and the inverted output of pin 7 is connected to switch b.

[0024] The model of the single-chip microcomputer U1 is HC15P121B1.

[0025] Beneficial effects: The utility model discloses a balanced battery charging system for correcting a reference voltage based on a control circuit. The circuit method is used to determine the reference voltage. A reference voltage has been written into the single-chip microcomputer U1, but there will be deviations in the actual voltage. Therefore, it is necessary to correct the reference voltage. The reference voltage is corrected by different voltage divisions of different resistors. The single-chip microcomputer U1 determines whether to remove the resistor R1, R2 or R3 based on the error between the actual standard voltage and the internal reference voltage of the single-chip microcomputer, so as to correct the reference voltage, and compare the corrected reference voltage with the voltage collected after the battery starts charging to determine whether the battery is fully charged;

[0026] When it is fully charged, the switch a disconnects the first charging branch, and the switch b turns on the second charging branch to continue charging the subsequent batteries, which can stop charging in time after the battery is fully charged to prevent overcharging, thereby achieving the effect of balanced charging of the battery pack. Brief description of the drawings

[0027] Figure 1 is a schematic structural diagram of the utility model.

[0028] Figure 2 is a schematic structural diagram of the control circuit of the utility model. Detailed implementation manners

[0029] This application relates to a balanced battery charging system for correcting a reference voltage based on a control circuit, which will be explained in detail below through specific implementation manners.

[0030] A balanced battery charging system for correcting a reference voltage based on a control circuit includes:

[0031] A charger and a battery pack connected to the charger;

[0032] The battery pack is formed by connecting multiple batteries in series, and a control circuit is connected in parallel to each battery;

[0033] The control circuit includes:

[0034] A single-chip microcomputer U1, a resistor R1, a resistor R2, a resistor R3, and a resistor R4;

[0035] The pin 1 of the single-chip microcomputer U1 is connected to a 3V power supply, the pin 3 is connected to one ends of the resistor R1, the resistor R2, and the resistor R3, the pin 4 is connected to the other ends of the resistor R1, the resistor R2, and the resistor R3, the pin 5 is connected to the positive electrode of the battery, and the pins 8 and the negative electrode of the battery are grounded;

[0036] The other ends of the resistor R1, the resistor R2, and the resistor R3 are connected to one end of the resistor R4, and the other end of the resistor R4 is grounded.

[0037] This utility model determines the reference voltage by means of a circuit. A reference voltage has been written into the single-chip microcomputer U1, but there will be deviations in the actual voltage. Therefore, it is necessary to correct the reference voltage. The reference voltage is corrected by the different voltage divisions of different resistors. The single-chip microcomputer U1 determines whether to remove resistor R1, R2 or R3 based on the error between the actual standard voltage and the internal reference voltage of the single-chip microcomputer, so as to correct the reference voltage, and compares the corrected reference voltage with the voltage collected after the battery starts charging to determine whether the battery is fully charged;

[0038] When it is fully charged, switch a disconnects the first charging branch, and switch b turns on the second charging branch to continue charging the subsequent batteries, which can stop charging in time after the battery is fully charged to prevent overcharging, thereby achieving the effect of balanced charging of the battery pack.

[0039] The function of the control circuit is to detect the voltage across a single battery to determine whether the battery has reached the saturation state. If it is detected that the battery has reached saturation, the charging of the battery is disconnected, and at the same time, another path will also be opened to continue charging other batteries.

[0040] Only one of switch a and switch b will be opened at the same time, and switch b is the inverse phase of switch a.

[0041] The control circuit further includes:

[0042] The first charging branch is connected to the negative electrode of the battery, and switch a is provided on the first charging branch;

[0043] The second charging branch is connected to one end of the first charging branch and the other end is connected to the positive electrode of the battery, and switch b is provided on the second charging branch.

[0044] The connection position of the second charging branch and the first charging branch is at the front end of switch a.

[0045] When multiple batteries are connected in series, the first charging branch of the first battery and the second charging branch of the last battery are connected to the charger.

[0046] Switch b is the inverse phase of switch a.

[0047] Pin 7 of the single-chip microcomputer U1 is connected to switch a, and the inverted output of pin 7 is connected to switch b.

[0048] The model of the single-chip microcomputer U1 is HC15P121B1.

[0049] Description of the working principle: When working, a reference voltage has been written inside the single-chip microcomputer U1. However, there will be some deviations in the actual voltage, so it is necessary to correct the reference voltage. The reference voltage is corrected by the different voltage divisions of different resistors. The single-chip microcomputer U1 determines whether to remove the resistor R1, R2, or R3 by judging the error between the actual standard voltage and the internal reference voltage of the single-chip microcomputer, so as to correct the reference voltage, and compares the corrected reference voltage with the voltage collected after the battery starts charging to determine whether the battery is fully charged;

[0050] When it is fully charged, the switch a disconnects the first charging branch, and the switch b turns on the second charging branch to continue charging the subsequent battery to complete the charging work.

[0051] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A balanced battery charging system based on a control circuit to correct a reference voltage, comprising: A charger, and a battery pack connected to the charger; The invention is characterized in that the battery pack is formed by connecting a plurality of batteries in series, and a control circuit is connected in parallel to each battery; The control circuit comprises: Single chip computer U1, resistor R1, resistor R2, resistor R3, resistor R4; Pin 1 of the single-chip computer U1 is connected to a 3V power supply, pin 3 is connected to one end of resistors R1, R2 and R3, pin 4 is connected to the other end of resistors R1, R2 and R3, pin 5 is connected to the positive electrode of the battery, and pin 8 and the negative electrode of the battery are grounded; The other ends of the resistors R1 , R2 and R3 are connected to one end of the resistor R4 , and the other end of the resistor R4 is grounded.

2. The balanced battery charging system based on the control circuit correcting the reference voltage according to claim 1, characterized in that: The control circuit further comprises: A first charging branch is connected to the negative electrode of the battery and is provided with a switch a; The second charging branch has one end connected to the first charging branch and the other end connected to the positive electrode of the battery, and a switch b is provided on the second charging branch.

3. A balanced battery charging system based on a control circuit to correct a reference voltage according to claim 2, characterized in that: The connection position between the second charging branch and the first charging branch is located at the front end of the switch a.

4. The balanced battery charging system based on the control circuit correcting the reference voltage according to claim 3, characterized in that: When multiple batteries are connected in series, the first charging branch of the first battery and the second charging branch of the last battery are connected to the charger.

5. The balanced battery charging system based on the control circuit correcting the reference voltage according to claim 2, characterized in that: The switch b is the inverse of the switch a.

6. The balanced battery charging system based on the control circuit correcting the reference voltage according to claim 1, characterized in that: Pin 7 of the single chip microcomputer U1 is connected to switch a, and the output of pin 7 is inverted and connected to switch b.

Images