Constant current source control device

Abstract

The utility model belongs to the technical field of constant current source control, and particularly discloses a constant current source control device which comprises an RS485 communication module, an AD sampling module used for receiving signals of a temperature sensor, a DA module used for voltage stabilization output, a master control module and a power supply module. The AD sampling module is used for converting collected temperature analog signals into digital signals, the main control module sends out control signals for voltage regulation according to the real-time state of the battery pack, then the DA module is used for receiving the control signals sent by the main control module, the Iset regulation circuit and the Vset regulation circuit are used for regulating the magnitude of output voltage, stability and precision of the output voltage are ensured, and the stability and accuracy of the battery pack are improved. Through combination of the AD sampling module and the DA module, mutual conversion between a digital signal and an analog signal is realized, the precision and stability of the system are obviously improved, and the flexibility and adaptability of the system are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of constant current source control, in particular to a constant current source control device. Background Art

[0002] A constant current source is a wide-spectrum, high-precision AC regulated current power supply whose output current does not change with changes in the load. In electronic systems, constant current sources are widely used in various situations requiring stable current. In the field of battery management, constant current sources control the size of the charging current to keep it constant, thereby ensuring that the battery can be charged at a predetermined rate. This charging method can effectively avoid problems such as overheating and damage caused by excessive charging current. It can also prevent problems such as long charging time and low efficiency caused by insufficient charging current.

[0003] The constant current source battery management system mainly consists of an input stage, an output stage, and a sampling feedback control part. The control device is a key component to ensure the stable, safe, and efficient operation of the battery system. The sampling feedback module monitors the current status of the battery pack in real time and feeds this information back to the main control part, enabling it to adjust the battery pack's charge and discharge strategy based on real-time data.

[0004] However, during actual operation, the sampling feedback module is affected by the external ambient temperature, and the feedback loop gain may be insufficient, resulting in unstable output current, affecting the system sampling accuracy and system stability of the constant current source battery management system. Therefore, we need to propose a constant current source control device to solve the above problems, so that it can improve the system sampling accuracy and system stability and reliability of the constant current source battery management system. Utility Model Content

[0005] The purpose of the utility model is to provide a constant current source control device, which can improve the system sampling accuracy and system stability and reliability of a constant current source battery management system, so as to solve the problems raised in the background technology.

[0006] To achieve the above object, the utility model provides the following technical solution: a constant current source control device, comprising an RS485 communication module, an AD sampling module for receiving a temperature sensor signal, a DA module for performing a voltage-regulated output, a main control module, and a power supply module, wherein the RS485 communication module is electrically connected to the main control module, and the main control module is electrically connected to the AD sampling module, the DA module, and the power supply module respectively;

[0007] The main control module includes an MCU chip, and the DA module includes an Iset regulating circuit and a Vset regulating circuit for regulating the output voltage. The Iset regulating circuit and the Vset regulating circuit are both electrically connected to the MCU chip.

[0008] Preferably, the Iset adjustment circuit includes an operational amplifier OPA2, a resistor R35 is connected between the output terminal and the negative terminal of the operational amplifier OPA2, a ground resistor R38 is connected to the connection terminal between the negative terminal of the operational amplifier OPA2 and the resistor R35, a positive terminal of the operational amplifier OPA2 is connected to a resistor R27 for connecting to a 3.3V voltage, a ground resistor R37 is connected to the connection terminal of the resistor R27 and the positive terminal of the operational amplifier OPA2, and a resistor R34, a resistor R33, a resistor R32 and a resistor R37 are connected to the connection terminal of the ground resistor R37 and the resistor R27 in sequence. R31, the connecting end of the resistor R34 and the resistor R33 is connected to a capacitor C12 to ground, the connecting end of the resistor R33 and the resistor R32 is connected to a capacitor C13 to ground, the connecting ends of the resistor R32 and the resistor R31 are respectively connected to a field effect transistor Q4 and a resistor R30 for connecting a 3.3V voltage, one end of the field effect transistor Q4 is connected to the other end of the resistor R31, and a resistor R39 and a diode D5 are connected in parallel to the connecting end of the resistor R31 and one end of the field effect transistor Q4, and a resistor R36 for receiving an Iset signal is connected to the connecting end of the resistor R39 and the diode D5.

[0009] Preferably, the Vset adjustment circuit includes an operational amplifier OPA1, a resistor R50 is connected between the output terminal and the negative terminal of the operational amplifier OPA1, a ground resistor R51 is connected to the connection terminal between the negative terminal of the operational amplifier OPA1 and the resistor R50, a resistor R45, a resistor R44, a resistor R43 and a resistor R42 are connected to the positive terminal of the operational amplifier OPA1 in sequence, a ground resistor R48 and a resistor R40 for connecting a 3.3V voltage are respectively connected to the connection terminal of the resistor R45 and the positive terminal of the operational amplifier OPA1, and the resistor R40 is connected to the ground resistor R48 and the resistor R40 for connecting a 3.3V voltage. 5 and the resistor R44 are connected to a ground capacitor C14, the connecting end of the resistor R44 and the resistor R43 is connected to a ground capacitor C15, the connecting ends of the resistor R43 and the resistor R42 are respectively connected to a field effect transistor Q5 and a resistor R41 for connecting to a 3.3V voltage, one end of the field effect transistor Q5 is connected to the other end of the resistor R42, and a resistor R49 and a diode D6 are connected in parallel to the connecting end of the resistor R42 and one end of the field effect transistor Q5, and a resistor R47 for receiving a Vset signal is connected to the connecting end of the resistor R49 and the diode D6.

[0010] Preferably, the AD sampling module includes an ADC chip U8, pin 5 of the ADC chip U8 is connected to a ground capacitor C88, pin 7 of the ADC chip U8 is connected to an adjustable resistor AD1, one end of the adjustable resistor AD1 is connected to a connector NTC1 and a connector GR1, pin 2 of the connector NTC1 is connected to a resistor R66, pin 2 of the connector GR1 is connected to a resistor R77, and the other end of the resistor R66, the other end of the resistor R77 and the other end of the adjustable resistor AD1 are all grounded.

[0011] Preferably, the power supply module includes a voltage conversion circuit for converting a 5V voltage into a stable 3.3V voltage, the voltage conversion circuit includes a voltage regulating chip U14, capacitors C43 and C41 are connected in parallel between pins 1 and 2 of the voltage regulating chip U14, and capacitors C44 and C42 are connected in parallel between pins 2 and 3 of the voltage regulating chip U14.

[0012] Preferably, the RS485 communication module includes a RES485 interface CN1, a communication chip U9 and a communication chip U7, and a resistor R56 for connecting to a 3.3V voltage is connected to pin 6 of the communication chip U7, and a resistor R55 for connecting to a 3.3V voltage is connected to pin 7 of the communication chip U7. Pins 2 and 3 of the communication chip U7 are respectively connected to pins 4 and 1 of the communication chip U9, and pins 2 and 3 of the communication chip U9 are connected to an isolation circuit. Pin 6 of the communication chip U9 is connected to pin 7 of the RS485 interface CN1 through a fuse F1, and pin 7 of the communication chip U9 is connected to pin 8 of the RD485 interface CN1 through a fuse F2, and a resistor R231 for connecting to a 5V voltage is connected to the connection end of the fuse F1 and the communication chip U9, and a ground resistor R241 is connected to the connection end of the fuse F2 and the communication chip U9.

[0013] Preferably, the isolation circuit includes an optocoupler U10, pin 1 of the optocoupler U10 is connected to a resistor R271 for connecting to a 3.3V voltage, pin 4 of the optocoupler U10 is connected to a resistor R281 for connecting to a 5V voltage, and pin 3 of the optocoupler U10 is connected to pins 3 and 3 of the communication chip U9, and pin 2 of the optocoupler U10 is connected to the MCU chip.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] 1. The utility model cooperates with the AD sampling module, the DA module and the main control module, and uses the AD sampling module to convert the collected temperature analog signal into a digital signal. The main control module sends a voltage regulation control signal according to the real-time status of the battery pack, and then uses the DA module to receive the control signal sent by the main control module, and adjusts the output voltage through the Iset regulation circuit and the Vset regulation circuit to ensure the stability and accuracy of the output voltage. Through the combination of the AD sampling module and the DA module, the mutual conversion between digital signals and analog signals is realized, which significantly improves the system accuracy and stability, enhances the system flexibility and adaptability, and at the same time reduces the system complexity, facilitates subsequent function expansion and upgrade, and improves the energy utilization efficiency of the entire battery management system.

[0016] 2. The utility model can query the working status of the device in real time through the cooperation of the RS485 communication module and the main control module. It can also communicate serially with external devices, receive control instructions from external devices, and adjust and optimize the working status of the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a system block diagram of the utility model;

[0018] Figure 2 This is a circuit diagram of the Iset adjustment circuit of the utility model;

[0019] Figure 3 This is a circuit diagram of the Vset adjustment circuit of the utility model;

[0020] Figure 4 This is the circuit diagram of the AD sampling module of the utility model;

[0021] Figure 5 This is a circuit diagram of the voltage conversion circuit of the utility model;

[0022] Figure 6 This is the circuit diagram of the RS485 communication module of the present utility model. DETAILED DESCRIPTION

[0023] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0024] See also Figure 1-6The utility model provides a technical solution: a constant current source control device, including an RS485 communication module, an AD sampling module for receiving temperature sensor signals, a DA module for performing voltage stabilization output, a main control module and a power supply module, wherein the RS485 communication module is electrically connected to the main control module, and the main control module is electrically connected to the AD sampling module, the DA module and the power supply module respectively;

[0025] The RS485 communication module includes a RES485 interface CN1, a communication chip U9, and a communication chip U7. Pin 6 of the communication chip U7 is connected to a resistor R56 for connecting to a 3.3V voltage. Pin 7 of the communication chip U7 is connected to a resistor R55 for connecting to a 3.3V voltage. Pins 2 and 3 of the communication chip U7 are connected to pins 4 and 1 of the communication chip U9, respectively. Pins 2 and 3 of the communication chip U9 are connected to an isolation circuit. Pin 6 of the communication chip U9 is connected to pin 7 of the RS485 interface CN1 through a fuse F1, and pin 7 of the communication chip U9 is connected to the RD485 through a fuse F2. The 8-pin connection of the interface CN1, and the connection end between the fuse F1 and the communication chip U9 is connected to a resistor R231 for connecting to a 5V voltage, and the connection end between the fuse F2 and the communication chip U9 is connected to a resistor R241 to ground. The communication chip U7 and the communication chip U9 are used in conjunction to convert the TTL level signal into an RS485 level signal to enable long-distance, high-speed data transmission on the bus, which is convenient for real-time query of the device working status. At the same time, it can also communicate serially with external devices, receive control instructions from external devices, and adjust and optimize the working status of the module.

[0026] The isolation circuit includes an optocoupler U10. Pin 1 of the optocoupler U10 is connected to a resistor R271 for connecting to a 3.3V voltage. Pin 4 of the optocoupler U10 is connected to a resistor R281 for connecting to a 5V voltage. Pin 3 of the optocoupler U10 is connected to pins 3 and 3 of the communication chip U9. Pin 2 of the optocoupler U10 is connected to the MCU chip. The optocoupler U10 is used to block the interference of the external environment on the communication chip U9 and the communication chip U7, so that they can transmit signals stably.

[0027] The RS485 communication module is used to send and receive signals. It receives external signals and, after resistive voltage division, transmits them to the differential signal receiving part for further signal processing. The processed signals are finally transmitted to the main control module and other processing units through the RES485 interface CN1 for corresponding operations. The internal signals are sent from the main control module, driven and amplified through the signal transmission path, and finally output to the external device through the differential signal transmission part.

[0028] The main control module includes an MCU chip, which receives digital signals from the AD sampling module for analysis, sends different control signals to the DA module according to logical requirements, and adjusts the voltage output through the DA module. According to the real-time status of the battery pack (such as voltage, current, temperature, etc.), the main control module will implement corresponding control strategies to ensure the safe, stable and efficient operation of the battery pack. It can also communicate with other devices through the UART interface to realize data transmission and exchange.

[0029] The DA module includes an Iset adjustment circuit and a Vset adjustment circuit for adjusting the output voltage. Both the Iset adjustment circuit and the Vset adjustment circuit are electrically connected to the MCU chip.

[0030] The Iset adjustment circuit includes an operational amplifier OPA2, wherein a resistor R35 is connected between the output terminal and the negative terminal of the operational amplifier OPA2, a ground resistor R38 is connected to the connection terminal between the negative terminal of the operational amplifier OPA2 and the resistor R35, a positive terminal of the operational amplifier OPA2 is connected to a resistor R27 for connecting to a 3.3V voltage, a ground resistor R37 is connected to the connection terminal between the resistor R27 and the positive terminal of the operational amplifier OPA2, a resistor R34, a resistor R33, a resistor R32 and a resistor R31 are connected to the connection terminal between the ground resistor R37 and the resistor R27 in sequence, a ground capacitor C12 is connected to the connection terminal between the resistor R34 and the resistor R33, a ground capacitor C13 is connected to the connection terminal between the resistor R33 and the resistor R32, a field effect transistor Q4 and a resistor R30 for connecting to a 3.3V voltage are respectively connected to the connection terminal between the resistor R32 and the resistor R31, and a terminal 1 of the field effect transistor Q4 is connected to the ground capacitor C12. The other end of the resistor R31 is connected, and a resistor R39 and a diode D5 are connected in parallel to the connection end of the resistor R31 and the end of the field-effect transistor Q4. The connection end of the resistor R39 and the diode D5 is connected to a resistor R36 for receiving the Iset signal. The control signal sent by the main control module is received through the resistor R36, and the output voltage is adjusted using the operational amplifier OPA2 and a series of resistors, capacitors and other components. The Iset control signal is sent from the MCU chip, filtered and divided by capacitors and resistors, and reaches the operational amplifier OPA2. The operational amplifier OPA2 outputs the corresponding voltage according to the input PWM signal and the preset resistance network value. At the same time, by adjusting the duty cycle of the PWM signal, the average voltage output by the operational amplifier OPA2 can be changed. Among them, the field-effect transistor Q4 plays the role of controlling the on and off of the circuit. The diode D5 in the circuit is mainly used to prevent reverse current shock and protect the circuit.

[0031] The Vset adjustment circuit includes an operational amplifier OPA1, a resistor R50 is connected between the output terminal and the negative terminal of the operational amplifier OPA1, a ground resistor R51 is connected to the connection terminal between the negative terminal of the operational amplifier OPA1 and the resistor R50, a resistor R45, a resistor R44, a resistor R43 and a resistor R42 are connected to the positive terminal of the operational amplifier OPA1 in sequence, a ground resistor R48 and a resistor R40 for connecting to a 3.3V voltage are connected to the connection terminal between the resistor R45 and the resistor R44, a ground capacitor C14 is connected to the connection terminal between the resistor R44 and the resistor R43. The end is connected to a ground capacitor C15, and the connection ends of the resistors R43 and R42 are respectively connected to a field effect transistor Q5 and a resistor R41 for connecting to a 3.3V voltage. One end of the field effect transistor Q5 is connected to the other end of the resistor R42, and the connection end between the resistor R42 and one end of the field effect transistor Q5 is connected in parallel with a resistor R49 and a diode D6. The connection end of the resistor R49 and the diode D6 is connected to a resistor R47 for receiving a Vset signal. The control signal from the main control module is received through the resistor R47, and the output voltage is adjusted using the operational amplifier OPA1 and a series of resistors, capacitors and other components. The Vset control signal is sent from the MCU chip, filtered and divided by capacitors and resistors, and reaches the operational amplifier OPA1. The operational amplifier OPA1 outputs the corresponding voltage according to the input PWM signal and the preset resistance network value. At the same time, by adjusting the duty cycle of the PWM signal, the average voltage output by the operational amplifier OPA1 can be changed.

[0032] The AD sampling module includes an ADC chip U8, pin 5 of the ADC chip U8 is connected to a ground capacitor C88, pin 7 of the ADC chip U8 is connected to an adjustable resistor AD1, one end of the adjustable resistor AD1 is connected to connectors NTC1 and GR1, pin 2 of the connector NTC1 is connected to a resistor R66, pin 2 of the connector GR1 is connected to a resistor R77, the other end of resistor R66, the other end of resistor R77 and the other end of the adjustable resistor AD1 are all grounded, and the temperature signal and voltage and current signal collected by the sensor are converted into digital signals by the ADC chip U8 and transmitted to the main control module to realize system status monitoring and control. When the temperature collected by the sensor reaches or exceeds the set battery start charging temperature, the collected temperature signal is converted into a digital signal through the ADC output and fed back to the main control module, and the main control module sends a signal to start battery charging. When the temperature rises to exceed the set battery stop charging temperature, the temperature signal is fed back to the main control module, and the main control module sends a signal to stop battery charging.

[0033] The power module includes a voltage conversion circuit for converting a 5V voltage into a stable 3.3V voltage. The voltage conversion circuit includes a voltage regulating chip U14. Capacitors C43 and C41 are connected in parallel between pins 1 and 2 of the voltage regulating chip U14. Capacitors C44 and C42 are connected in parallel between pins 2 and 3 of the voltage regulating chip U14. The input 5V voltage is converted into a stable 3.3V output voltage through the voltage regulating chip U14 for use by other modules. The stability and accuracy of the output voltage can be ensured through the precise control of the voltage regulating chip U14.

[0034] The AD sampling module is used to convert the collected temperature analog signal into a digital signal. The main control module sends a voltage regulation control signal according to the real-time status of the battery pack. The DA module is then used to receive the control signal sent by the main control module, and the output voltage is adjusted through the Iset adjustment circuit and the Vset adjustment circuit to ensure the stability and accuracy of the output voltage. Through the combination of the AD sampling module and the DA module, the mutual conversion between digital signals and analog signals is realized, which significantly improves the system accuracy and stability, enhances the system flexibility and adaptability, and reduces the system complexity. It also facilitates subsequent function expansion and upgrades, and improves the energy utilization efficiency of the entire battery management system.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A constant current source control device, characterized in that: It includes an RS485 communication module, an AD sampling module for receiving temperature sensor signals, a DA module for performing voltage stabilization output, a main control module and a power supply module, wherein the RS485 communication module is electrically connected to the main control module, and the main control module is electrically connected to the AD sampling module, the DA module and the power supply module respectively; The main control module includes an MCU chip, and the DA module includes an Iset regulating circuit and a Vset regulating circuit for regulating the output voltage. The Iset regulating circuit and the Vset regulating circuit are both electrically connected to the MCU chip.

2. A constant current source control device according to claim 1, characterized in that: The Iset adjustment circuit includes an operational amplifier OPA2, a resistor R35 is connected between the output terminal and the negative terminal of the operational amplifier OPA2, a ground resistor R38 is connected to the connection terminal between the negative terminal of the operational amplifier OPA2 and the resistor R35, a positive terminal of the operational amplifier OPA2 is connected to a resistor R27 for connecting to a 3.3V voltage, a ground resistor R37 is connected to the connection terminal between the resistor R27 and the positive terminal of the operational amplifier OPA2, and a resistor R34, a resistor R33, a resistor R32 and a resistor R37 are connected to the connection terminal between the ground resistor R37 and the resistor R27 in sequence.

1. The connecting end of the resistor R34 and the resistor R33 is connected to a ground capacitor C12, the connecting end of the resistor R33 and the resistor R32 is connected to a ground capacitor C13, the connecting ends of the resistor R32 and the resistor R31 are respectively connected to a field effect transistor Q4 and a resistor R30 for connecting to a 3.3V voltage, one end of the field effect transistor Q4 is connected to the other end of the resistor R31, and a resistor R39 and a diode D5 are connected in parallel to the connecting end of the resistor R31 and the field effect transistor Q4, and a resistor R36 for receiving an Iset signal is connected to the connecting end of the resistor R39 and the diode D5.

3. A constant current source control device according to claim 2, characterized in that: The Vset adjustment circuit includes an operational amplifier OPA1, a resistor R50 is connected between the output terminal and the negative terminal of the operational amplifier OPA1, a ground resistor R51 is connected to the connection terminal between the negative terminal of the operational amplifier OPA1 and the resistor R50, a resistor R45, a resistor R44, a resistor R43 and a resistor R42 are connected to the positive terminal of the operational amplifier OPA1 in sequence, a ground resistor R48 and a resistor R40 for connecting to a 3.3V voltage are connected to the connection terminal of the resistor R45 and the positive terminal of the operational amplifier OPA1 respectively, the resistor R45 and The connecting end of the resistor R44 is connected to a capacitor C14 to ground, the connecting end of the resistor R44 and the resistor R43 is connected to a capacitor C15 to ground, the connecting ends of the resistor R43 and the resistor R42 are respectively connected to a field effect transistor Q5 and a resistor R41 for connecting a 3.3V voltage, one end of the field effect transistor Q5 is connected to the other end of the resistor R42, and the connecting end of the resistor R42 and one end of the field effect transistor Q5 is connected in parallel with a resistor R49 and a diode D6, and the connecting end of the resistor R49 and the diode D6 is connected to a resistor R47 for receiving a Vset signal.

4. A constant current source control device according to claim 3, characterized in that: The AD sampling module includes an ADC chip U8, pin 5 of the ADC chip U8 is connected to a ground capacitor C88, pin 7 of the ADC chip U8 is connected to an adjustable resistor AD1, one end of the adjustable resistor AD1 is connected to connector NTC1 and connector GR1, pin 2 of the connector NTC1 is connected to resistor R66, pin 2 of the connector GR1 is connected to resistor R77, and the other end of the resistor R66, the other end of the resistor R77 and the other end of the adjustable resistor AD1 are all grounded.

5. A constant current source control device according to claim 4, characterized in that: The power module includes a voltage conversion circuit for converting a 5V voltage into a stable 3.3V voltage. The voltage conversion circuit includes a voltage regulating chip U14. Capacitors C43 and C41 are connected in parallel between pins 1 and 2 of the voltage regulating chip U14. Capacitors C44 and C42 are connected in parallel between pins 2 and 3 of the voltage regulating chip U14.

6. A constant current source control device according to claim 1, characterized in that: The RS485 communication module includes a RES485 interface CN1, a communication chip U9 and a communication chip U7. Pin 6 of the communication chip U7 is connected to a resistor R56 for connecting to a 3.3V voltage. Pin 7 of the communication chip U7 is connected to a resistor R55 for connecting to a 3.3V voltage. Pins 2 and 3 of the communication chip U7 are respectively connected to pins 4 and 1 of the communication chip U9. Pins 2 and 3 of the communication chip U9 are connected to an isolation circuit. Pin 6 of the communication chip U9 is connected to pin 7 of the RS485 interface CN1 through a fuse F1. Pin 7 of the communication chip U9 is connected to pin 8 of the RD485 interface CN1 through a fuse F2. A resistor R231 for connecting to a 5V voltage is connected to the connection end between the fuse F1 and the communication chip U9. A ground resistor R241 is connected to the connection end between the fuse F2 and the communication chip U9.

7. A constant current source control device according to claim 6, characterized in that: The isolation circuit includes an optocoupler U10, pin 1 of the optocoupler U10 is connected to a resistor R271 for connecting to a 3.3V voltage, pin 4 of the optocoupler U10 is connected to a resistor R281 for connecting to a 5V voltage, and pin 3 of the optocoupler U10 is connected to pins 3 and 3 of the communication chip U9, and pin 2 of the optocoupler U10 is connected to the MCU chip.

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