Anti-interference multi-channel load data parallel acquisition system suitable for new energy battery replacement

Abstract

The utility model discloses a kind of anti-interference multichannel load data parallel acquisition systems suitable for new energy battery swap, including multiple output low-noise isolation power supply circuit, multichannel ADC circuit, double MCU processing module and RS485 interface circuit, double MCU processing module includes auxiliary MCU and main control MCU, multichannel load data is connected with the input end of multichannel ADC circuit, the output end of multichannel ADC circuit is connected with auxiliary MCU communication by digital isolator, auxiliary MCU is connected with main control MCU communication, main control MCU is connected with RS485 interface circuit communication by digital isolator.The utility model realizes the electrical isolation of data acquisition system, and the mutual electrical isolation between modules is carried out using digital isolator, effectively improve the anti-interference performance of data acquisition system, double MCU processing module guarantees the real-time performance of multichannel data acquisition, provides sufficient performance hardware platform for subsequent battery swap system iteration upgrade.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery swapping technology, specifically an anti-interference multi-channel parallel acquisition system for load data suitable for new energy battery swapping. Background Technology

[0002] In battery swapping technology for new energy vehicles, rapid positioning of the battery to be replaced is crucial, determining the efficiency and success rate of the swapping process. Early battery swapping systems used limit switches for battery positioning, resulting in low success rates and efficiency, and easily causing battery damage. Later technologies required positioning by detecting the force on the battery positioning pins, significantly improving success rates and efficiency. The latest battery swapping technology, in addition to detecting the force on the positioning pins to determine positioning success, also requires determining the type of battery to be replaced by detecting its weight. The latest battery swapping systems require the entire swapping process to take no more than 3 seconds, leaving less than 1 second for the positioning system. This places higher demands on the data acquisition system. Under the premise of an embedded technology-based data acquisition system, it requires both high multi-channel sampling speed and a certain level of acquisition accuracy, as well as high anti-interference performance and long-term stability.

[0003] Strain gauge sensors are currently widely used in force measurement and force-related applications. They are mainly used for on-site data acquisition. In the field of load data acquisition, the electrical signal output by the strain gauge sensor has a definite relationship with the force applied to the strain gauge sensor. The output signal is conditioned and then processed by the data acquisition system.

[0004] Currently, there are many sources of interference in new energy battery swapping systems, such as servo motors and drivers, relays, contactors, etc. Conventional data acquisition systems are easily affected by these interference sources, which may lead to unstable operation of the data acquisition system. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide an anti-interference multi-channel load data parallel acquisition system suitable for new energy battery swapping. It realizes the electrical isolation of the data acquisition system and uses digital isolators to achieve mutual electrical isolation between modules, which effectively improves the anti-interference performance of the data acquisition system. The dual MCU processing modules ensure the real-time performance of multi-channel data acquisition, and at the same time provide a hardware platform with sufficient performance for subsequent battery swapping system iteration and upgrade.

[0006] The technical solution of this utility model is as follows:

[0007] An anti-interference multi-channel parallel acquisition system for load data of new energy battery swapping includes a multi-output low-noise isolated power supply circuit, a multi-channel ADC circuit, a dual MCU processing module, and an RS485 interface circuit. The multi-output isolated power supply circuit outputs three isolated power supplies. The multi-channel ADC circuit, the dual MCU processing module, and the RS485 interface circuit are connected to the three isolated power supplies one by one to realize power transmission. The multi-channel load data acquired by multiple strain gauge sensors are connected to the multi-channel signal input terminals of the multi-channel ADC circuit one by one. The dual MCU processing module includes an auxiliary MCU and a main control MCU. The multi-channel signal output terminals of the multi-channel ADC circuit are all connected to the auxiliary MCU through a first digital isolator. The auxiliary MCU is connected to the main control MCU. The main control MCU is connected to the RS485 interface circuit through a second digital isolator. The RS485 interface circuit is connected to the main controller of the new energy battery swapping system.

[0008] The multi-output low-noise isolated power supply circuit includes a current-mode PWM controller and a high-frequency transformer. The primary winding of the high-frequency transformer is connected to a DC power supply and is driven to conduct by the current-mode PWM controller. The three secondary windings of the high-frequency transformer output three isolated power supplies respectively. The auxiliary winding of the high-frequency transformer is connected to the power supply terminal of the current-mode PWM controller to provide operating voltage to the internal circuit of the current-mode PWM controller.

[0009] The DC power supply is a 24V DC power supply. After passing through a fuse, the 24V DC power supply is connected to the input terminal of the common-mode filter. The output terminal of the common-mode filter outputs a 24V operating voltage. One end of the primary winding of the high-frequency transformer is connected to the 24V operating voltage, and the other end of the primary winding of the high-frequency transformer is connected to the drive output terminal of the current-mode PWM controller. The three secondary windings of the high-frequency transformer output two 8V isolated power supplies and one 5V isolated power supply VCC, respectively. One end of the auxiliary winding of the high-frequency transformer is connected to the feedback input terminal of the current-mode PWM controller, and the auxiliary voltage output from one end of the auxiliary winding of the high-frequency transformer is rectified and filtered before being connected to the power supply terminal of the current-mode PWM controller. The other end of the auxiliary winding of the high-frequency transformer is grounded. The 5V isolated power supply is connected to the optocoupler feedback interface terminal of the current-mode PWM controller through a linear optocoupler to realize the feedback of the secondary winding output voltage.

[0010] Of the two 8V isolated power supplies, one 8V isolated power supply outputs a 5V analog power supply AVCC after passing through a linear voltage regulator circuit to power multiple strain gauge sensors and multi-channel ADC circuits. The other 8V isolated power supply outputs a 5V digital power supply 5VC1 through an LDO chip to power the RS485 interface circuit. The 5V isolated power supply VCC powers the auxiliary MCU and the main control MCU.

[0011] The linear voltage regulator circuit includes a filter capacitor C19, NPN transistors Q1 and Q2, a Zener diode U6, resistors R15, R16, and R17. One end of the filter capacitor C19 is connected to one of the 8V isolation power supplies, and the other end of the filter capacitor C19 is connected to the anode of the Zener diode U6. The cathode of the Zener diode U6 is connected to the base of the NPN transistor Q1. The collector of the NPN transistor Q1 is connected to the collector of the NPN transistor Q2 through resistor R16. The emitter of the NPN transistor Q1 is connected to the base of the NPN transistor Q2. The emitter of the NPN transistor Q2 outputs a 5V analog power supply AVCC. One end of resistor R15 is connected to the 5V analog power supply AVCC, and one end of resistor R17 is grounded. The other ends of resistors R15 and R17 are both connected to the reference terminal of the Zener diode U6.

[0012] The analog power supply of the multi-channel ADC circuit is a 5V analog power supply AVCC, and the digital power supply is VDD2 obtained by connecting the 5V analog power supply AVCC to the power supply equipotential connection decoupling filter circuit; the analog power supply of the first digital isolator is a 5V isolation power supply VCC, and the digital power supply is VDD2; the analog power supply of the second digital isolator is a 5V isolation power supply VCC, and the digital power supply is a 5V digital power supply 5VC1.

[0013] The power supply equipotential connection decoupling filter circuit includes two zero-ohm resistors and two decoupling filter capacitors. One zero-ohm resistor is connected between the 5V analog power supply AVCC and the digital power supply VDD2, and the other zero-ohm resistor is connected between the analog ground AGND and the digital ground DGND. One decoupling filter capacitor is connected in parallel between the 5V analog power supply AVCC and the analog ground AGND, and the other decoupling filter capacitor is connected in parallel between the digital power supply VDD2 and the digital ground DGND.

[0014] The multi-channel ADC circuit includes multiple ADC conversion chips and multiple strain gauge sensors. The load data collected by each strain gauge sensor is connected to the signal input terminal of a corresponding ADC conversion chip through a differential signal processing circuit. The auxiliary MCU receives the multi-channel ADC conversion values ​​output by the signal output terminals of multiple ADC conversion chips through multiple first digital isolators. That is, the input terminal of each first digital isolator is connected to the signal output terminal of a corresponding ADC conversion chip, and the output terminals of multiple first digital isolators are all connected to the auxiliary MCU.

[0015] Both the auxiliary MCU and the main control MCU are automotive-grade 32-bit 8051 microcontrollers.

[0016] The auxiliary MCU is connected to the first digital isolator and the main control MCU via the SPI bus.

[0017] The RS485 interface circuit includes an RS485 logic level conversion chip. The main control MCU communicates with the RS485 logic level conversion chip through a second digital isolator. The RS485 logic level conversion chip also communicates with the main controller of the new energy battery swapping system.

[0018] Advantages of this utility model:

[0019] (1) This utility model uses a multi-output low-noise isolated power supply circuit to supply power to each module in the data acquisition system separately, and uses a current-mode PWM controller to control the isolated power supply, detect the current in real time, and can quickly respond to output changes, reduce output current fluctuations, and has the characteristics of reducing ripple and noise.

[0020] (2) The multi-channel ADC circuit of this utility model is connected to the auxiliary MCU through the first digital isolator, and the main control MCU is connected to the RS485 interface circuit through the second digital isolator, which realizes mutual electrical isolation between modules and ensures that each module does not interfere with each other, thereby effectively improving the anti-interference performance of the data acquisition system.

[0021] (3) This utility model is equipped with a dual MCU processing module, which adopts the method of main control MCU plus auxiliary MCU. The auxiliary MCU is dedicated to the acquisition of each high-resolution ADC output signal in the multi-channel and the corresponding data processing. The multi-channel data acquired by the auxiliary MCU is packaged and transmitted to the main control MCU via DMA through the SPI bus, thereby reducing the CPU burden of the main control MCU and the auxiliary MCU and ensuring the real-time performance of multi-channel load data acquisition. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the principle of this utility model. "——" represents the communication link, and "---" represents the power supply link.

[0023] Figure 2 This is a circuit diagram of the multi-output low-noise isolated power supply circuit of this utility model, which outputs three isolated power supplies.

[0024] Figure 3 This is a circuit diagram of the linear voltage regulator circuit in the multi-output low-noise isolated power supply circuit of this utility model, which converts the output of the 5V analog power supply AVCC.

[0025] Figure 4 This is the circuit diagram of the 8V isolated power supply to 5V digital power supply 5VC1 in the multi-output low-noise isolated power supply circuit of this utility model.

[0026] Figure 5 This is a circuit diagram of the optocoupler feedback section in the multi-output low-noise isolated power supply circuit of this utility model.

[0027] Figure 6 This is a circuit diagram of the power supply equipotential connection decoupling filter circuit of this utility model.

[0028] Figure reference numerals: 1-Multi-output low-noise isolated power supply circuit, 2-Multi-channel ADC circuit, 3-Dual MCU processing module, 31-Auxiliary MCU, 32-Main control MCU, 4-RS485 interface circuit, 5-First digital isolator, 6-Second digital isolator, 7-Power supply equipotential bonding decoupling filter circuit. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] See Figure 1 This is an anti-interference multi-channel parallel acquisition system for load data, suitable for new energy battery swapping. It includes a multi-output low-noise isolation power supply circuit 1, a multi-channel ADC circuit 2, a dual MCU processing module 3, and an RS485 interface circuit 4. The dual MCU processing module 3 includes an auxiliary MCU 31 and a main control MCU 32. Both the auxiliary MCU 31 and the main control MCU 32 are automotive-grade 32-bit 8051 microcontrollers. The automotive-grade 32-bit 8051 microcontroller integrates a large capacity FLASH ROM and SRAM, up to 5 SPIs, four UARTs, CAN bus interfaces, etc. It integrates a highly reliable power-on reset circuit and a low-temperature drift internal high-speed oscillator to ensure reliable serial communication without external crystal oscillators across the entire temperature range.

[0031] Multiple strain gauge sensors are used to collect load data after battery swapping and positioning. The multi-channel ADC circuit 2 includes multiple ADC conversion chips (with integrated PGA, maximum amplification of 128x, and conversion rate of 10sps~2400sps). The load data collected by each strain gauge sensor is connected to the signal input of a corresponding ADC conversion chip via a differential signal processing circuit. The auxiliary MCU 31 receives the multi-channel ADC conversion values ​​output from the signal outputs of multiple ADC conversion chips through multiple first digital isolators 5 (model NSi824W1). That is, the input of each first digital isolator 5 is connected to the signal output of a corresponding ADC conversion chip. The outputs of the multiple first digital isolators 5 are all connected to the auxiliary MCU 31 via an SPI bus. The auxiliary MCU 31 is connected to the main control MCU 32 via an SPI bus. The auxiliary MCU 31 uses DMA to connect to the first digital isolators 5 and the main control MCU respectively. 32 performs data communication, improving the real-time performance of high-speed parallel data acquisition through multiple channels. The RS485 interface circuit 4 includes an RS485 logic level conversion chip. The main control MCU 32 communicates with the RS485 logic level conversion chip through the second digital isolator 6 (model NSi824W1). The RS485 logic level conversion chip uses the MODBUS RTU communication protocol to communicate with the main controller of the new energy battery swapping system.

[0032] The multi-output low-noise isolated power supply circuit 1 includes a current-mode PWM controller U3 (model VPS2103) and a high-frequency transformer T1 (model EPC17). A 24V DC power supply (24Vin) is connected to the input of a common-mode filter L1 via fuse F1. The output of the common-mode filter L1 is a 24V operating voltage. D7 is a transient suppression diode, and D1 is a reverse protection diode. One end of the primary winding of the high-frequency transformer T1 is connected to the 24V operating voltage, and the other end is connected to the drive output (DRN pin) of the current-mode PWM controller U3. The three secondary windings of the high-frequency transformer T1 output two 8V isolated power supplies respectively (i.e.,...). Figure 2 The high-frequency transformer T1 has 8V1 and 8V) and a 5V isolated power supply VCC. One end of the auxiliary winding of the high-frequency transformer T1 is connected to the feedback input terminal (FB pin) of the current mode PWM controller U3, and the auxiliary voltage output from one end of the auxiliary winding of the high-frequency transformer T1 is rectified and filtered and then connected to the power supply terminal (VDD pin) of the current mode PWM controller U3. The other end of the auxiliary winding of the high-frequency transformer T1 is grounded to JGND.

[0033] See Figure 3In the two 8V isolated power supplies, one of the 8V isolated power supplies (i.e., 8V) outputs a 5V analog power supply AVCC after passing through a linear voltage regulator circuit to power multiple strain gauge sensors and the multi-channel ADC circuit 2. The linear voltage regulator circuit includes a filter capacitor C19, NPN transistors Q1 and Q2, a Zener diode U6, resistors R15, R16, and R17. One end of the filter capacitor C19 is connected to one of the 8V isolated power supplies, and the other end of the filter capacitor C19 is connected to the anode of the Zener diode U6. The cathode of the Zener diode U6 is connected to the base of the NPN transistor Q1. The collector of the NPN transistor Q1 is connected to the collector of the NPN transistor Q2 through resistor R16. The emitter of the NPN transistor Q1 is connected to the base of the NPN transistor Q2. The emitter outputs a 5V analog power supply AVCC. One end of resistor R15 is connected to the 5V analog power supply AVCC, one end of resistor R17 is grounded, and the other ends of resistors R15 and R17 are connected to the reference terminal of Zener diode U6. Filter capacitor C19 is used to filter out high-frequency interference. A Darlington transistor composed of NPN transistors Q1 and Q2 provides current gain. Resistors R15 and R17 form a voltage divider sampling circuit that samples the output AVCC. The sampled voltage is sent to the reference terminal of Zener diode U6. Zener diode U6 compares the sampled voltage with its internal reference voltage and outputs an error control signal. Resistor R16 receives the error control signal output by Zener diode U6 and drives the Darlington transistor. Resistor R13 is a pull-up resistor. Capacitors C20 and C21 filter the output voltage AVCC.

[0034] See Figure 4 Another 8V isolated power supply (i.e. 8V1) outputs 5V digital power 5VC1 through LDO chip U7 to power the RS485 logic level conversion chip of RS485 interface circuit 4.

[0035] The 5V isolated power supply VCC powers both the auxiliary MCU 31 and the main control MCU 32. Furthermore, the 5V isolated power supply VCC is connected to the optocoupler feedback interface (COM pin) of the current-mode PWM controller U3 via a linear optocoupler U4 (see [link]). Figure 5 The secondary winding output voltage is fed back. U5 is a reference voltage source chip that receives the sampled voltage output by the filter network composed of resistor R11 and capacitor C16, compares it with the internal reference voltage, and outputs an error signal to control the linear optocoupler U4.

[0036] In the multi-channel ADC circuit 2, the analog power supply of each ADC conversion chip is a 5V analog power supply AVCC, and the digital power supply is VDD2 obtained after the 5V analog power supply AVCC is connected to the power supply equipotential connection decoupling filter circuit 7; the analog power supply of the first digital isolator 5 is a 5V isolation power supply VCC, and the digital power supply is VDD2; the analog power supply of the second digital isolator 6 is a 5V isolation power supply VCC, and the digital power supply is a 5V digital power supply 5VC1.

[0037] See Figure 6 The power supply equipotential connection decoupling filter circuit 7 includes two zero-ohm resistors R34 and R35 and two decoupling filter capacitors C47 and C48. The zero-ohm resistor R35 is connected between the 5V analog power supply AVCC and the digital power supply VDD2, and the zero-ohm resistor R34 is connected between the analog ground AGND and the digital ground DGND. The decoupling filter capacitor C48 is connected in parallel between the 5V analog power supply AVCC and the analog ground AGND, and the decoupling filter capacitor C47 is connected in parallel between the digital power supply VDD2 and the digital ground DGND. The two zero-ohm resistors keep the potentials of the 5V analog power supply AVCC and the digital power supply VDD2 consistent, and the two decoupling filter capacitors decouple and filter the analog power supply AVCC and the digital power supply VDD2, so that the digital and analog circuits can share the same power supply and reduce mutual interference.

[0038] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An anti-interference multi-channel parallel load data acquisition system suitable for new energy battery swapping, characterized in that: It includes a multi-output low-noise isolated power supply circuit, a multi-channel ADC circuit, a dual MCU processing module, and an RS485 interface circuit. The multi-output isolated power supply circuit outputs three isolated power supplies. The multi-channel ADC circuit, the dual MCU processing module, and the RS485 interface circuit are each connected to one of the three isolated power supplies to realize power transmission. The multi-channel load data collected by multiple strain gauge sensors are each connected to the multi-channel signal input terminal of the multi-channel ADC circuit. The dual MCU processing module includes an auxiliary MCU and a main control MCU. The multi-channel signal output terminal of the multi-channel ADC circuit is connected to the auxiliary MCU through a first digital isolator. The auxiliary MCU is connected to the main control MCU. The main control MCU is connected to the RS485 interface circuit through a second digital isolator. The RS485 interface circuit is connected to the main controller of the new energy battery swapping system. The multi-output low-noise isolated power supply circuit includes a current-mode PWM controller and a high-frequency transformer. The primary winding of the high-frequency transformer is connected to a DC power supply and is driven to conduct by the current-mode PWM controller. The three secondary windings of the high-frequency transformer output three isolated power supplies respectively. The auxiliary winding of the high-frequency transformer is connected to the power supply terminal of the current-mode PWM controller to provide operating voltage to the internal circuit of the current-mode PWM controller.

2. The anti-interference multi-channel parallel load data acquisition system suitable for new energy battery swapping as described in claim 1, characterized in that: The DC power supply is a 24V DC power supply. After passing through a fuse, the 24V DC power supply is connected to the input terminal of the common-mode filter. The output terminal of the common-mode filter outputs a 24V operating voltage. One end of the primary winding of the high-frequency transformer is connected to the 24V operating voltage, and the other end of the primary winding of the high-frequency transformer is connected to the drive output terminal of the current-mode PWM controller. The three secondary windings of the high-frequency transformer output two 8V isolated power supplies and one 5V isolated power supply VCC, respectively. One end of the auxiliary winding of the high-frequency transformer is connected to the feedback input terminal of the current-mode PWM controller, and the auxiliary voltage output from one end of the auxiliary winding of the high-frequency transformer is rectified and filtered before being connected to the power supply terminal of the current-mode PWM controller. The other end of the auxiliary winding of the high-frequency transformer is grounded. The 5V isolated power supply is connected to the optocoupler feedback interface terminal of the current-mode PWM controller through a linear optocoupler to realize the feedback of the secondary winding output voltage. Of the two 8V isolated power supplies, one 8V isolated power supply outputs a 5V analog power supply AVCC after passing through a linear voltage regulator circuit to power multiple strain gauge sensors and multi-channel ADC circuits. The other 8V isolated power supply outputs a 5V digital power supply 5VC1 through an LDO chip to power the RS485 interface circuit. The 5V isolated power supply VCC powers the auxiliary MCU and the main control MCU.

3. The anti-interference multi-channel parallel load data acquisition system suitable for new energy battery swapping as described in claim 2, characterized in that: The linear voltage regulator circuit includes a filter capacitor C19, NPN transistors Q1 and Q2, a Zener diode U6, resistors R15, R16, and R17. One end of the filter capacitor C19 is connected to one of the 8V isolation power supplies, and the other end of the filter capacitor C19 is connected to the anode of the Zener diode U6. The cathode of the Zener diode U6 is connected to the base of the NPN transistor Q1. The collector of the NPN transistor Q1 is connected to the collector of the NPN transistor Q2 through resistor R16. The emitter of the NPN transistor Q1 is connected to the base of the NPN transistor Q2. The emitter of the NPN transistor Q2 outputs a 5V analog power supply AVCC. One end of resistor R15 is connected to the 5V analog power supply AVCC, and one end of resistor R17 is grounded. The other ends of resistors R15 and R17 are both connected to the reference terminal of the Zener diode U6.

4. The anti-interference multi-channel parallel load data acquisition system suitable for new energy battery swapping according to claim 2, characterized in that: The analog power supply of the multi-channel ADC circuit is a 5V analog power supply AVCC, and the digital power supply is VDD2 obtained by connecting the 5V analog power supply AVCC to a decoupling filter circuit through the power supply equipotential connection; the analog power supply of the first digital isolator is a 5V isolation power supply VCC, and the digital power supply is VDD2; the analog power supply of the second digital isolator is a 5V isolation power supply VCC, and the digital power supply is a 5V digital power supply 5VC1.

5. The anti-interference multi-channel parallel load data acquisition system suitable for new energy battery swapping according to claim 4, characterized in that: The power supply equipotential connection decoupling filter circuit includes two zero-ohm resistors and two decoupling filter capacitors. One zero-ohm resistor is connected between the 5V analog power supply AVCC and the digital power supply VDD2, and the other zero-ohm resistor is connected between the analog ground AGND and the digital ground DGND. One decoupling filter capacitor is connected in parallel between the 5V analog power supply AVCC and the analog ground AGND, and the other decoupling filter capacitor is connected in parallel between the digital power supply VDD2 and the digital ground DGND.

6. The anti-interference multi-channel parallel acquisition system for load data applicable to new energy battery swapping as described in claim 1, characterized in that: The multi-channel ADC circuit includes multiple ADC conversion chips and multiple strain gauge sensors. The load data collected by each strain gauge sensor is connected to the signal input terminal of a corresponding ADC conversion chip through a differential signal processing circuit. The auxiliary MCU receives the multi-channel ADC conversion values ​​output by the signal output terminals of multiple ADC conversion chips through multiple first digital isolators. That is, the input terminal of each first digital isolator is connected to the signal output terminal of a corresponding ADC conversion chip, and the output terminals of multiple first digital isolators are all connected to the auxiliary MCU.

7. The anti-interference multi-channel parallel load data acquisition system suitable for new energy battery swapping according to claim 1, characterized in that: Both the auxiliary MCU and the main control MCU are automotive-grade 32-bit 8051 microcontrollers.

8. The anti-interference multi-channel parallel acquisition system for load data applicable to new energy battery swapping as described in claim 1, characterized in that: The auxiliary MCU is connected to the first digital isolator and the main control MCU via the SPI bus.

9. The anti-interference multi-channel parallel acquisition system for load data applicable to new energy battery swapping as described in claim 1, characterized in that: The RS485 interface circuit includes an RS485 logic level conversion chip. The main control MCU communicates with the RS485 logic level conversion chip through a second digital isolator. The RS485 logic level conversion chip also communicates with the main controller of the new energy battery swapping system.

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