Interface circuit, PCB and vehicle-mounted bidirectional power supply

Abstract

The utility model discloses an interface circuit, a PCB and a vehicle-mounted bidirectional power supply, the interface circuit comprises an isolation power supply unit, a CAN communication unit and an isolation communication unit, the input end and the output end of the isolation power supply unit are respectively connected with an external power supply device and the power supply end of the CAN communication unit; therefore, CAN communication between the digital signal processor of the vehicle-mounted bidirectional power supply and the communication equipment is realized. The isolation communication unit is used for realizing serial port communication; according to the interface circuit disclosed by the invention, the compatibility problem of communication and power supply between the vehicle-mounted bidirectional power supply and the external communication equipment is effectively solved; the isolation power supply unit ensures stable power supply of the CAN communication unit, avoids interference of an external power supply device, and improves the stability and reliability of the CAN communication unit during working; and the isolation communication unit provides another communication way through a serial port communication mode, so that the communication flexibility and redundancy of the vehicle-mounted bidirectional power supply are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of circuit design technology, and in particular to an interface circuit, a PCB board, and a vehicle-mounted bidirectional power supply. Background Technology

[0002] In modern mining transportation systems, mining trucks are key transportation tools, and optimizing their energy efficiency is crucial for cost control and environmental protection in the entire mining operation. To improve the energy efficiency of mining trucks, they can be used as energy converters when attached to the wire mesh to charge the batteries. Specifically, when a mining truck needs to decelerate or stop during operation, its braking system is activated. Traditional braking methods mainly rely on mechanical friction to convert kinetic energy into heat energy. This process is not only inefficient but also causes significant wear and tear on the braking system components. Mining trucks using energy recovery braking systems are different. They convert the kinetic energy of the wheels into electrical energy through the inverter function of the motor. In this process, the motor operates as a generator, converting kinetic energy into electrical energy, and then using the onboard power management system to recharge the batteries.

[0003] Adding a display screen to a mining trolley can significantly improve the intuitiveness and safety of operation. Specifically, the display screen can show key information such as the trolley's operating status, fault diagnosis information, and work data in real time, enabling operators to quickly understand the equipment status and make timely adjustment or maintenance decisions. In addition, the display screen can also serve as a human-machine interface, providing operation guidance and safety prompts to reduce the risk of misoperation.

[0004] However, the harsh mining environment makes the power supply system susceptible to voltage fluctuations and noise interference. If the display screen and its interface circuits do not use isolated power conversion technology, the instability of the power supply may cause display abnormalities, such as image flickering, color distortion, or black screen. In extreme cases, power instability may also damage the internal circuitry of the display screen, causing the equipment to become completely unusable.

[0005] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an interface circuit that effectively solves the compatibility problem of communication and power supply between vehicle bidirectional power supply and external communication equipment.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An interface circuit includes an isolated power supply unit, a CAN communication unit, and an isolated communication unit. The input terminal of the isolated power supply unit and the power supply terminal of the isolated communication unit are respectively used to connect to an external power supply device. The output terminal of the isolated power supply unit is connected to the power supply terminal of the CAN communication unit. The CAN communication unit is used to realize CAN communication between the digital signal processor of the vehicle bidirectional power supply and the communication device. The isolated communication unit is used to realize serial communication between the digital signal processor of the vehicle bidirectional power supply and the communication device.

[0009] In the interface circuit described above, the isolated power supply unit includes an isolated power supply chip U231, an overcurrent protection unit, a voltage divider unit, and an indicator unit. The input terminal of the overcurrent protection unit is used to connect to an external power supply device, and the output terminal of the overcurrent protection unit is connected to the VIN pin of the isolated power supply chip U231. The VO pin of the isolated power supply chip U231 is connected to the power supply terminal of the CAN communication unit and the voltage divider unit, respectively. The voltage divider unit is also connected to the indicator unit.

[0010] In the interface circuit described above, the CAN communication unit includes a CAN communication chip U234. The 5VISIO pin of the CAN communication chip U234 is connected to the VO pin of the isolated power supply chip U231. The CANL and CANH pins of the CAN communication chip U234 are respectively used to connect to the digital signal processor of the vehicle bidirectional power supply.

[0011] In the interface circuit described above, the CAN communication unit further includes a reverse section. The input terminal of the reverse section is connected to the OUT pin of the CAN communication chip U234, and the output terminal of the reverse section is used to connect to the digital signal processor of the vehicle bidirectional power supply.

[0012] In the interface circuit described above, the isolation communication unit includes a digital isolation section, a serial communication section, and an interface protection section. The first communication terminal of the digital isolation section is used to connect to the digital signal processor of the vehicle bidirectional power supply. The second communication terminal of the digital isolation section is connected to the first communication terminal of the serial communication section, and the second communication terminal of the serial communication section is connected to the communication terminal of the interface protection section.

[0013] In the interface circuit described above, the digital isolation section includes a digital isolation chip U23. Pins OA and IB of the digital isolation chip U23 are respectively used to connect to the digital signal processor of the vehicle bidirectional power supply. Pins OB and IA of the digital isolation chip U23 are respectively connected to the first communication terminal of the serial communication section.

[0014] In the interface circuit, the serial communication unit includes a serial communication chip U232. The ROUT2 and DIN2 pins of the serial communication chip U232 are respectively connected to the IA and OB pins of the digital isolation chip U23. The RIN2 and DOUT2 pins of the serial communication chip U232 are respectively connected to the communication terminal of the interface protection unit.

[0015] In the interface circuit, the interface protection unit includes an interface protection chip U233. Pins 8, 10 and 12 of the interface protection chip U233 are respectively connected to pin RIN2 of the serial communication chip U232. Pins 2, 4 and 6 of the interface protection chip U233 are respectively connected to pin DOUT2 of the serial communication chip U2323.

[0016] This utility model also provides a PCB board, on which the interface circuits described above are printed.

[0017] This utility model also provides a vehicle-mounted bidirectional power supply, which uses any of the interface circuits described above to connect to the display screen or operation panel.

[0018] Beneficial effects:

[0019] This utility model provides an interface circuit that effectively solves the compatibility problem of communication and power supply between the vehicle bidirectional power supply and external communication equipment by setting an isolated power supply unit. The isolated power supply unit ensures a stable power supply for the CAN communication unit and avoids interference from external power supply devices, thereby improving the stability and reliability of the CAN communication unit during operation. The isolated communication unit provides another communication path through serial communication, enhancing the communication flexibility and redundancy of the vehicle bidirectional power supply. Attached Figure Description

[0020] Figure 1 A circuit block diagram of the interface circuit provided by this utility model;

[0021] Figure 2 Circuit schematic diagram of the isolated power supply unit and CAN communication unit provided by this utility model;

[0022] Figure 3 The circuit diagram of the isolation communication unit provided by this utility model.

[0023] Explanation of key component symbols: 1-Isolation power supply unit, 2-CAN communication unit, 3-Isolation communication unit, 31-Digital isolation section, 32-Serial communication section, 33-Interface protection section, 4-Digital signal processor. Detailed Implementation

[0024] This utility model provides an interface circuit, a PCB board, and a vehicle-mounted bidirectional power supply. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and examples.

[0025] In the description of this utility model, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0026] Please see Figures 1 to 3 This utility model provides an interface circuit, including an isolated power supply unit 1, a CAN communication unit 2, and an isolated communication unit 3. The input terminal of the isolated power supply unit 1 and the power supply terminal of the isolated communication unit 3 are respectively used to connect to an external power supply device. The output terminal of the isolated power supply unit 1 is connected to the power supply terminal of the CAN communication unit 2. The CAN communication unit 2 is used to realize CAN communication between the digital signal processor 4 of the vehicle bidirectional power supply and the communication device. The isolated communication unit 3 is used to realize serial communication between the digital signal processor 4 of the vehicle bidirectional power supply and the communication device.

[0027] This application discloses an interface circuit that effectively solves the compatibility problem of communication and power supply between the vehicle-mounted bidirectional power supply and external communication equipment by setting an isolated power supply unit 1. The isolated power supply unit 1 ensures stable power supply for the CAN communication unit 2 and the isolated communication unit 3, while avoiding interference from external power supply devices, thus improving the stability and reliability of the CAN communication unit 2 during operation. The CAN communication unit 2 utilizes CAN bus technology to realize high-speed and high-reliability data communication between the digital signal processor 4 and the communication equipment, which is suitable for scenarios such as vehicle-mounted bidirectional power supplies with extremely high requirements for communication real-time performance and stability. The isolated communication unit 3 provides another communication path through serial communication, enhancing the communication flexibility and redundancy of the vehicle-mounted bidirectional power supply.

[0028] In this embodiment, the external power supply device is used to provide 12V DC voltage to the isolated power supply unit 1, and the communication device can be a display screen or operation panel, etc.; the digital signal processor 4 of the vehicle bidirectional power supply is existing technology and can be composed of a DSP AVP32F335 chip and its peripheral circuits.

[0029] Further, please refer to Figure 2The isolated power supply unit 1 includes an isolated power supply chip U231, an overcurrent protection unit, a voltage divider unit, and an indicator unit. The input terminal of the overcurrent protection unit is used to connect to an external power supply device, and the output terminal of the overcurrent protection unit is connected to the VIN pin of the isolated power supply chip U231. The VO pin of the isolated power supply chip U231 is connected to the power supply terminal of the CAN communication unit 2 and the voltage divider unit, respectively. The voltage divider unit is also connected to the indicator unit.

[0030] In this embodiment, please refer to Figure 2 The isolated power supply chip U231 is model B1205LS-1WR3. The overcurrent protection section includes a fuse F4, a filter capacitor C127, and a capacitor C150. The voltage divider section includes capacitors C158 and C157, resistors R199, R210, R209, R198, and R211. The indicator section includes a light-emitting diode BY. The positive terminal of the filter capacitor C127 and one end of the fuse F4 are respectively used to connect to an external power supply device. The other end of the fuse F4 is connected to one end of the capacitor C150 and the VIN pin of the isolated power supply chip U231. The pins of the isolated power supply chip U231... VO is connected to the power supply terminal of the CAN communication unit 2, one end of capacitor C158, one end of capacitor C157, one end of resistor R199, one end of resistor R210, one end of resistor R209, one end of resistor R198, and the positive terminal of LED BY. The negative terminal of LED BY is connected to one end of resistor R211. The other ends of capacitor C158, capacitor C157, resistor R199, resistor R210, resistor R209, resistor R198, and resistor R211 are respectively grounded.

[0031] In this embodiment, firstly, the design of the isolation power supply chip U231 enables independent power supply to the CAN communication unit 2, effectively isolating electrical interference that may be caused by external power supply devices and improving the stability and reliability of the CAN communication unit 2 during operation. Secondly, the overcurrent protection section, including fuse F4, filter capacitor C127, and capacitor C150, can promptly cut off the circuit when the current is too high, protecting the isolation power supply chip U231 and other circuit components from damage and enhancing circuit safety. Thirdly, the voltage divider section, through the combination of capacitors C158 and C157, resistors R199, R210, R209, R198, and R211, achieves stable voltage division of the power supply voltage, providing a suitable voltage input for the indicator and ensuring its normal operation. Finally, the LED BY of the indicator can intuitively display the operating status of the isolation power supply unit 1, facilitating troubleshooting and system maintenance for users and improving the user experience.

[0032] Further, please refer to Figure 2 The CAN communication unit 2 includes a CAN communication chip U234. The 5VISIO pin of the CAN communication chip U234 is connected to the VO pin of the isolated power supply chip U231. The CANL and CANH pins of the CAN communication chip U234 are respectively used to connect to the digital signal processor 4 of the vehicle bidirectional power supply.

[0033] Further, please refer to Figure 2 The CAN communication unit 2 also includes a reverse part, the input end of which is connected to the pin OUT of the CAN communication chip U234, and the output end of which is used to connect to the digital signal processor 4 of the vehicle bidirectional power supply.

[0034] In this embodiment, please refer to Figure 2 The CAN communication chip U234 is model 1653. The inverter section includes a first inverter U156 and a second inverter U154. The input terminals of the first inverter U156 and the second inverter U154 are respectively connected to the pin OUT of the CAN communication chip U234. The output terminals of the first inverter U156 and the second inverter U154 are respectively used to connect to the digital signal processor 4 of the vehicle bidirectional power supply.

[0035] In this embodiment, firstly, by connecting pin 5VISIO of the CAN communication chip U234 to pin VO of the isolation power supply chip U231, a stable power supply to the CAN communication unit 2 is ensured, effectively avoiding the impact of voltage fluctuations on communication quality and improving the stability and reliability of communication. Secondly, the CAN communication unit 2 is equipped with an inverter, including a first inverter U156 and a second inverter U154. The input terminals of these two inverters are connected to pin OUT of the CAN communication chip U234, and the output terminals are used to connect to the digital signal processor 4 of the vehicle bidirectional power supply. This allows for the inversion of the signal output by the CAN communication chip, enhancing the signal's anti-interference capability and further improving the stability and reliability of communication. In addition, the CAN communication chip U234 of model 1653 is used. This chip has advantages such as high performance and low power consumption, which can meet the requirements of the vehicle bidirectional power supply for communication speed and data transmission volume, while also reducing the energy consumption of the entire system.

[0036] Further, please refer to Figure 1 and Figure 3 The isolation communication unit 3 includes a digital isolation unit 31, a serial communication unit 32, and an interface protection unit 33. The first communication terminal of the digital isolation unit 31 is used to connect to the digital signal processor 4 of the vehicle bidirectional power supply. The second communication terminal of the digital isolation unit 31 is connected to the first communication terminal of the serial communication unit 32. The second communication terminal of the serial communication unit 32 is connected to the communication terminal of the interface protection unit 33.

[0037] Further, please refer to Figure 3 The digital isolation unit 31 includes a digital isolation chip U23. Pins OA and IB of the digital isolation chip U23 are used to connect to the digital signal processor 4 of the vehicle bidirectional power supply. Pins OB and IA of the digital isolation chip U23 are connected to the first communication terminal of the serial communication unit 32.

[0038] In this embodiment, please refer to Figure 3 The digital isolation chip U23 is model 122U31. The digital isolation chip U23 is responsible for converting the 3.3V signal to the external serial port signal. The diodes D56 and D57, which are connected to the VDD2 and GND2 pins of the digital isolation chip U23, are used to provide ESD protection and suppress electrostatic shock.

[0039] Further, please refer to Figure 3The serial communication unit 32 includes a serial communication chip U232. The ROUT2 and DIN2 pins of the serial communication chip U232 are respectively connected to the IA and OB pins of the digital isolation chip U23. The RIN2 and DOUT2 pins of the serial communication chip U232 are respectively connected to the communication terminals of the interface protection unit 33.

[0040] In this embodiment, please refer to Figure 3 The serial communication chip U232 is a reserved RS232 level conversion chip, used to connect to a display board or display screen with an RS232 interface; the resistor R228 connected to the VCC pin of the serial communication chip U232, the resistor R230 connected to the RIN2 pin of the serial communication chip U232, and the resistor R229 connected to the DOUT2 pin of the serial communication chip U232 are used to achieve impedance matching and reduce signal reflection; the capacitors C169 and C171 connected to the V+ and V- pins of the serial communication chip U232 are used to filter out high-frequency power supply interference; the diodes D96 and D97 connected to the GND and DOUT2 pins of the serial communication chip U232 are used to suppress transient overvoltage.

[0041] Further, please refer to Figure 3 The interface protection unit 33 includes an interface protection chip U233. Pins 8, 10 and 12 of the interface protection chip U233 are respectively connected to pin RIN2 of the serial communication chip U232. Pins 2, 4 and 6 of the interface protection chip U233 are respectively connected to pin DOUT2 of the serial communication chip U2323.

[0042] In this embodiment, please refer to Figure 3 The interface protection chip U233 is model Z-231011816106. The interface protection chip U233 is used to protect the serial communication interface and enhance anti-interference capability. The capacitors C175 and CY2 connected to the interface protection chip U233 are used for filtering. Combined with EARTH2 grounding, electrostatic interference is released. Resistors R258, R259 and R260 form a voltage divider circuit to ensure the stability of the signal input to the interface protection chip U233 and prevent overvoltage damage to the chip.

[0043] In this embodiment, firstly, through the organic combination of the digital isolation unit 31, the serial communication unit 32, and the interface protection unit 33, safe and reliable communication between the digital signal processor 4 of the vehicle-mounted bidirectional power supply and external devices is achieved; the digital isolation chip U23 is responsible for converting the 3.3V signal to the external serial port signal, effectively isolating interference between different levels and improving the stability of communication; the serial communication unit 32 uses a reserved RS232 level conversion chip U232, which not only supports connection to a display board or display screen with an RS232 interface, but also achieves impedance matching through resistors R228, R230, and R229, reducing signal reflection. The signal transmission quality is improved. Meanwhile, the filtering effect of capacitors C169 and C171, and the transient overvoltage suppression effect of diodes D96 and D97, jointly protect the serial communication chip U232 from high-frequency power supply interference and transient overvoltage damage. Finally, the interface protection chip U233 used in the interface protection unit 33 not only enhances the anti-interference capability of the serial communication interface, but also ensures the stability of the signal input to the interface protection chip U233 through the filtering effect of capacitors C175 and CY2, and the voltage divider circuit composed of resistors R258, R259, and R260, preventing overvoltage damage to the chip.

[0044] This utility model also provides a PCB board, on which the interface circuits described above are printed.

[0045] This utility model also provides a vehicle-mounted bidirectional power supply, which uses any of the interface circuits described above to connect to the display screen or operation panel.

[0046] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. An interface circuit, characterized by It includes an isolated power supply unit, a CAN communication unit, and an isolated communication unit. The input terminal of the isolated power supply unit and the power supply terminal of the isolated communication unit are respectively used to connect to an external power supply device. The output terminal of the isolated power supply unit is connected to the power supply terminal of the CAN communication unit. The CAN communication unit is used to realize CAN communication between the digital signal processor of the vehicle bidirectional power supply and the communication device. The isolated communication unit is used to realize serial communication between the digital signal processor of the vehicle bidirectional power supply and the communication device.

2. An interface circuit according to claim 1, characterized in that The isolated power supply unit includes an isolated power supply chip U231, an overcurrent protection unit, a voltage divider unit, and an indicator unit. The input terminal of the overcurrent protection unit is used to connect to an external power supply device, and the output terminal of the overcurrent protection unit is connected to the VIN pin of the isolated power supply chip U231. The VO pin of the isolated power supply chip U231 is connected to the power supply terminal of the CAN communication unit and the voltage divider unit respectively. The voltage divider unit is also connected to the indicator unit.

3. An interface circuit as claimed in claim 2, characterized in that The CAN communication unit includes a CAN communication chip U234. The 5VISIO pin of the CAN communication chip U234 is connected to the VO pin of the isolated power supply chip U231. The CANL and CANH pins of the CAN communication chip U234 are respectively used to connect to the digital signal processor of the vehicle bidirectional power supply.

4. An interface circuit as claimed in claim 3, characterized in that The CAN communication unit also includes a reverse section. The input terminal of the reverse section is connected to the OUT pin of the CAN communication chip U234, and the output terminal of the reverse section is used to connect to the digital signal processor of the vehicle bidirectional power supply.

5. An interface circuit according to claim 1, wherein, The isolation communication unit includes a digital isolation section, a serial communication section, and an interface protection section. The first communication terminal of the digital isolation section is used to connect to the digital signal processor of the vehicle bidirectional power supply. The second communication terminal of the digital isolation section is connected to the first communication terminal of the serial communication section, and the second communication terminal of the serial communication section is connected to the communication terminal of the interface protection section.

6. An interface circuit as claimed in claim 5, characterized in that The digital isolation unit includes a digital isolation chip U23. Pins OA and IB of the digital isolation chip U23 are respectively used to connect to the digital signal processor of the vehicle bidirectional power supply. Pins OB and IA of the digital isolation chip U23 are respectively connected to the first communication terminal of the serial communication unit.

7. An interface circuit as claimed in claim 6, characterized in that The serial communication unit includes a serial communication chip U232. The ROUT2 and DIN2 pins of the serial communication chip U232 are respectively connected to the IA and OB pins of the digital isolation chip U23. The RIN2 and DOUT2 pins of the serial communication chip U232 are respectively connected to the communication terminals of the interface protection unit.

8. An interface circuit according to claim 7, wherein, The interface protection unit includes an interface protection chip U233. Pins 8, 10 and 12 of the interface protection chip U233 are connected to pin RIN2 of the serial communication chip U232, and pins 2, 4 and 6 of the interface protection chip U233 are connected to pin DOUT2 of the serial communication chip U232.

9. A PCB board characterized by, The PCB is printed with the interface circuit as claimed in any one of claims 1-8.

10. A vehicle-mounted bidirectional power supply, characterized by comprising: The vehicle-mounted bidirectional power supply adopts the interface circuit as claimed in any one of claims 1-8 to realize connection with the display screen or the operation panel.

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