High-precision formation power supply circuit

Abstract

The present invention provides a high-precision formation power supply circuit, the formation power supply circuit comprises: a charging chip, a discharging chip, the switch ends of the charging chip and the discharging chip are connected to a battery, the input end of the charging chip and the output end of the discharging chip are connected to a high-voltage power supply, the enabling end of the charging chip and the discharging chip are connected to a driving end, the comparison end of the discharging chip is connected to a current setting end through a first operational amplifier, the comparison end of the charging chip is connected to the current setting end through a second operational amplifier, and is also connected to a voltage setting end through a third operational amplifier, the current setting end can adjust the current size of charging and discharging the battery, and the voltage setting end can set an upper limit of the battery voltage. The high-precision formation power supply circuit of the present invention has a small power circuit volume, accurately controls the charging current and charging voltage, and through the large and small range switching control, the accuracy after calibration can be within 0.05%, which is higher than the current industry standard of 0.1%, pure hardware circuit design, and more flexible debugging.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit design, and in particular to a high-precision formation power supply circuit. Background Art

[0002] In the field of battery production, the formation process is a very important process, and the quality of the formation process mainly depends on the accuracy of the formation power supply. At present, there are many formation power supplies on the market with a maximum charging current of more than 10A and average accuracy. For products that only require a 3A charging current environment, this is undoubtedly a bit of excess resources and adds a lot of extra costs. Summary of the invention

[0003] In view of the shortcomings of the current prior art, an object of the present invention is to provide a high-precision formation power supply circuit.

[0004] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0005] A high-precision formation power supply circuit comprises: a charging chip and a discharging chip, wherein the switch ends of the charging chip and the discharging chip are connected to a battery, the input end of the charging chip and the output end of the discharging chip are connected to a high-voltage power supply, the enabling ends of the charging chip and the discharging chip are connected to a driving end, the comparison end of the discharging chip is connected to a current setting end through a first operational amplifier, the comparison end of the charging chip is connected to the current setting end through a second operational amplifier, and is also connected to a voltage setting end through a third operational amplifier, the current setting end can adjust the current size of charging and discharging the battery, and the voltage setting end can set the upper limit of the battery voltage.

[0006] Furthermore, a sampling resistor is connected between the switch end of the charging chip and the discharging chip and the battery, and the two ends of the sampling resistor are also connected to the two input ends of the voltage amplifier respectively, and the output end of the voltage amplifier is also connected to the input end of the first operational amplifier and the second operational amplifier respectively.

[0007] Further, the sampling resistor is connected to a multiplexing switch, and the multiplexing switch is then connected to the voltage amplifier.

[0008] Furthermore, the charging chip and the discharging chip are connected to the battery through a battery compartment; the battery compartment is also connected to a fourth operational amplifier, and the fourth operational amplifier obtains the battery positive terminal voltage and the battery negative terminal voltage at both ends of the current battery, outputs the battery sensing voltage to the third operational amplifier, and then adjusts the voltage setting terminal size to limit the voltage size at both ends of the battery.

[0009] Furthermore, the formation power supply circuit also includes a comparator and an OR gate. By setting an upper limit of the voltage and current value to the comparator as a reference, it is compared with the current voltage value and current value. If the upper limit is exceeded, a high level is output; the comparison result of the voltage and current is given to the OR gate, and then the overvoltage and overcurrent comparison result is given to the charging chip and the discharging chip. At the same time, the overvoltage and overcurrent comparison result flag is also given to the control board to determine whether there is an overcurrent and overvoltage phenomenon. Once the control board detects a high level, it will automatically cut off the circuit to protect the entire circuit.

[0010] Furthermore, the control board is provided with a voltage overcurrent comparison result flag terminal, a voltage setting terminal / current setting terminal, a working power supply terminal, a reference voltage terminal, a GPIO terminal, a USB / 485 / I2C terminal, and a drive terminal (DIR).

[0011] Furthermore, the high voltage power supply also includes a linear voltage regulator and a DC voltage converter to provide the operating power supply voltage required by various other components.

[0012] Furthermore, the charging chip adopts TPS54821, the discharging chip adopts TPS611781, the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier all adopt OP07CD, the multiplexing switch adopts SN74LV4053, and the voltage amplifier adopts INA188.

[0013] Furthermore, the comparator adopts MIC7221, and the OR gate adopts HEF4071.

[0014] Furthermore, the sampling resistor includes a first resistor and a second resistor, and is switched by a relay, the first resistor is used for a first range control, and the second resistor is used for a second range control.

[0015] The high-precision formation power supply circuit of the present invention has a small power circuit volume, accurately controls the charging current and charging voltage, and through large and small range switching control, the accuracy after calibration can be within 0.05%, which is higher than the current industry standard of 0.1%. It is a pure hardware circuit design and has more flexible debugging. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 The figure is a general framework diagram of the high-precision formation power supply circuit of the present invention;

[0018] Figure 2It is a framework diagram of a specific embodiment of the high-precision formation power supply circuit of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1 As shown, the high-precision formation power supply circuit of the present invention includes a charging chip (TPS54821) and a discharging chip (TPS611781), the switch terminals (SW) of the charging chip (TPS54821) and the discharging chip (TPS611781) are connected to a battery (LV), the input terminal (VIN) of the charging chip (TPS54821) and the output terminal (VOUT) of the discharging chip (TPS611781) are connected to a high-voltage power supply (HV), the enable terminals (EN) of the charging chip (TPS54821) and the discharging chip (TPS611781) are connected to a driving terminal (DIR), the comparison terminal (COMP) of the discharging chip (TPS611781) is connected to a current setting terminal (ISET) through a first operational amplifier, the comparison terminal (COMP) of the charging chip (TPS54821) is connected to the current setting terminal (ISET) through a second operational amplifier, and is also connected to a voltage setting terminal (VSET) through a third operational amplifier. The voltage range of the battery (LV) is 0-5V, the high voltage power supply (HV) is a power supply with Source and Sink capabilities, with a voltage range of 14-15V, and the drive end (DIR) is connected by the control board (J3 / J4, such as Figure 2 When in charging mode, the driver terminal (DIR) is set low, the charging chip (TPS54821) starts working, and the high-voltage power supply (HV) charges the battery through the charging chip (TPS54821), and the high-voltage power supply (HV) is 14V; when in discharging mode, the driver terminal (DIR) is set high, the discharge chip (TPS611781) starts working, and the battery is discharged to the high-voltage power supply (HV) through the discharge chip (TPS611781), and the high-voltage power supply (HV) is 15V. The current setting terminal (ISET) can adjust the current size of the battery charging and discharging, and the voltage setting terminal (VSET) can set the upper limit of the battery voltage.

[0021] Furthermore, a sampling resistor is connected between the switch end (SW) of the charging chip (TPS54821) and the discharging chip (TPS611781) and the battery (LV), and the two ends of the sampling resistor are also connected to the two input ends of the voltage amplifier respectively, and the output end of the voltage amplifier is also connected to the input ends of the first operational amplifier and the second operational amplifier respectively.

[0022] Please also refer to Figure 2 As shown, a specific embodiment of the high-precision formation power supply circuit of the present invention is connected to a sampling resistor through a charging chip (TPS54821) and a discharging chip (TPS611781); then connected to a multiplexing switch (SN74LV4053), the multiplexing switch (SN74LV4053) can select a path of charging or discharging; then connected to a voltage amplifier (INA188), the voltage amplifier (INA188) amplifies the differential voltage across the sampling resistor; the amplified differential voltage (VOL) is given to the first operational amplifier and the second operational amplifier. In this embodiment, the first operational amplifier and the second operational amplifier both use OP07CD; then the voltage of the current setting terminal (ISET) is set to adjust the magnitude of the amplified voltage, thereby adjusting the differential voltage across the sampling resistor, and finally achieving the magnitude of the charge and discharge current control, wherein the first operational amplifier controls the discharge current, and the second operational amplifier controls the charging current.

[0023] The charging chip (TPS54821) and the discharging chip (TPS611781) are connected to the battery (LV) through the battery compartment (J_B5 / J_B6). In fact, the other end of the sampling resistor is also connected to the battery (LV) through the battery compartment (J_B5 / J_B6). Figure 2 For the sake of simplicity, it is not shown. The battery compartment (J_B5 / J_B6) is also connected to the fourth op amp, which obtains the battery positive terminal voltage (V+) and the battery negative terminal voltage (V-) at both ends of the current battery, outputs the battery sensing voltage (VOL_SEN) to the third op amp, and then adjusts the voltage setting terminal (VSET) to limit the voltage at both ends of the battery. The third op amp and the fourth op amp both use OP07CD.

[0024] The formation power supply circuit also includes a comparator (MIC7221) and an OR gate (HEF4071). By setting an upper limit of the voltage and current value to the comparator (MIC7221) as a reference, it is compared with the current voltage value (V_bat) and current value (I_bat). If it exceeds the upper limit, a high level is output; the comparison result of the voltage and current is given to the OR gate (HEF4071), and then the overvoltage and overcurrent comparison result (OVP_OCP) is given to the charging chip (TPS54821) and the discharge chip (TPS611781). At the same time, the overvoltage and overcurrent comparison result flag (OVP_OCP_FLG) is also given to the control board (J3 / J4) to determine whether there is an overcurrent and overvoltage phenomenon. Once the control board (J3 / J4) detects a high level, it will automatically cut off the circuit to protect the entire circuit.

[0025] The control board (J3 / J4) is provided with a voltage overcurrent comparison result flag terminal (OVP_OCP_FLG), a voltage setting terminal (VSET) / current setting terminal (ISET), a working power terminal (POWER), a reference voltage terminal (REF_2V5), a GPIO terminal, a USB / 485 / I2C terminal, and a drive terminal (DIR) (not shown).

[0026] The high voltage power supply (HV) is connected to the charging chip (TPS54821) to provide power to the charging chip (TPS54821), which is 14V; the high voltage power supply (HV) is also connected to the discharge chip (TPS611781) to receive the power output of (TPS611781), which is 15V. Figure 2 For the sake of simplicity, the wiring relationship is not shown. In addition, the high voltage power supply (HV) also provides a conventional normal working power supply voltage of 12V. The high voltage power supply (HV) also includes a linear regulator (LDO) and a direct current voltage converter (DCDC) to provide the working power supply voltage required by various other components, such as 9V, 3V3, 5V, -5V.

[0027] Furthermore, the sampling resistor includes a first resistor and a second resistor, and is switched by a relay, the first resistor is used for a first range control, such as 0-300mA, and the second resistor is used for a second range control, such as 300mA-3A.

[0028] The high-precision formation power supply circuit of the present invention has a small power circuit volume, accurately controls the charging current and charging voltage, and through large and small range switching control, the accuracy after calibration can be within 0.05%, which is higher than the current industry standard of 0.1%. It is a pure hardware circuit design and has more flexible debugging.

[0029] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A high-precision formation power supply circuit, characterized in that: The formation power supply circuit comprises: a charging chip and a discharging chip, wherein the switch ends of the charging chip and the discharging chip are connected to a battery, the input end of the charging chip and the output end of the discharging chip are connected to a high voltage power supply, the enabling ends of the charging chip and the discharging chip are connected to a driving end, the comparison end of the discharging chip is connected to a current setting end through a first operational amplifier, the comparison end of the charging chip is connected to the current setting end through a second operational amplifier, and is also connected to a voltage setting end through a third operational amplifier, the current setting end can adjust the current size of charging and discharging the battery, and the voltage setting end sets the upper limit of the battery voltage; a sampling resistor is also connected between the switch ends of the charging chip and the discharging chip and the battery, the two ends of the sampling resistor are also respectively connected to the two input ends of the voltage amplifier, and the output end of the voltage amplifier is simultaneously respectively connected to the input ends of the first operational amplifier and the second operational amplifier; The charging chip and the discharging chip are connected to the battery through the battery compartment; the battery compartment is also connected to the fourth operational amplifier, the fourth operational amplifier obtains the battery positive terminal voltage and the battery negative terminal voltage at both ends of the current battery, outputs the battery sensing voltage to the third operational amplifier, and then adjusts the voltage setting terminal size to limit the voltage size at both ends of the battery; The sampling resistor includes a first resistor and a second resistor, which are switched by a relay, the first resistor is used for a first range control, and the second resistor is used for a second range control; The formation power supply circuit also includes a comparator and an OR gate. By setting an upper limit of the voltage and current value to the comparator as a reference, it is compared with the current voltage value and current value. If the upper limit is exceeded, a high level is output; the comparison result of the voltage and current is given to the OR gate, and then the overvoltage and overcurrent comparison result is given to the charging chip and the discharging chip. At the same time, the overvoltage and overcurrent comparison result flag is also given to the control board to determine whether there is an overcurrent and overvoltage phenomenon. Once the control board detects a high level, it will automatically cut off the circuit to protect the entire circuit.

2. The formation power supply circuit according to claim 1, characterized in that: The sampling resistor is connected to a multiplexing switch, which is then connected to the voltage amplifier.

3. The formation power supply circuit according to claim 1, characterized in that: The control board is provided with a voltage overcurrent comparison result flag terminal, a voltage setting terminal / current setting terminal, a working power supply terminal, a reference voltage terminal, a GPIO terminal, a USB / 485 / I2C terminal, and a drive terminal (DIR).

4. The formation power supply circuit according to claim 1, characterized in that: The high voltage power supply also includes a linear voltage regulator and a DC voltage converter to provide the operating power supply voltage required by various other components.

5. The formation power supply circuit according to claim 2, characterized in that: The charging chip adopts TPS54821, the discharging chip adopts TPS611781, the first operational amplifier, the second operational amplifier, the third operational amplifier and the fourth operational amplifier all adopt OP07CD, the multiplexing switch adopts SN74LV4053, and the voltage amplifier adopts INA188.

6. The formation power supply circuit according to claim 1, characterized in that: The comparator is MIC7221, and the OR gate is HEF4071.

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