CAN isolation communication circuit and corresponding DC charging pile
Through the main control IC module and auxiliary circuit with its own power supply, the problem of large space and high cost of isolated power supply in charging pile communication is solved, and the smaller and lower cost CAN isolated communication is achieved, and the communication speed and stability are improved.
Patent Information
- Application Number
- CN202422357948.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-09-26
AI Technical Summary
In the existing charging pile communication methods, the isolation power supply occupies a large space, has a large chip demand and is expensive, resulting in high production costs and unstable supply.
The main control IC module with its own power supply is adopted, including the CAN sending pin, receiving pin, ground pin and isolated power output pin, forming an isolation barrier, eliminating independent isolated power supply, and combining auxiliary circuits such as capacitors, resistors, inductor coils to realize CAN isolation communication.
It reduces the equipment space, reduces device costs, improves communication stability, reaches 1MPBS, and has an isolation voltage of 2500V.
Smart Images
Figure CN223168336U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of DC charging piles, in particular to a CAN isolation communication circuit and a corresponding DC charging pile. Background Art
[0002] At present, with the rapid development of the new energy electric vehicle industry, various charging devices and charging piles for vehicles have emerged as the times require. As the most important charging system for electric vehicles, most charging piles use high voltage and large current. In the existing industry, the communication method between charging piles and electric vehicles basically uses an isolated power supply and TI's ISO1050DUBR isolated CAN transceiver to achieve communication. This technical solution not only has a large occupied space for the isolated power supply, but also requires a large number of core chips, and the price is expensive, and the supply is very unstable, resulting in high comprehensive production costs of the product. Content of the Utility Model
[0003] In order to overcome the deficiencies of the prior art, a CAN isolation communication circuit and a corresponding DC charging pile are proposed.
[0004] A CAN isolation communication circuit is applied in a DC charging pile and includes a main control IC module with its own power supply. The main control IC module includes a power supply pin, a CAN transmit pin, a CAN receive pin, and a ground pin connected to a preset single-chip microcomputer. The main control IC module further includes a communication CANH pin, a communication CANL pin, and a vehicle communication isolation ground pin connected to an electric vehicle. The main control IC module further includes an isolated power output pin and a communication level adjustment pin. Among them, an isolation grid is formed between the CAN transmit pin, the CAN receive pin, the communication level adjustment pin and the communication CANH pin, the communication CANL pin.
[0005] Preferably, the power supply of the power supply pin is 5V, and a first capacitor and a second capacitor are connected in parallel between the power supply pin and the ground pin.
[0006] Preferably, a first resistor is provided between the CAN transmit pin and the preset single-chip microcomputer; a second resistor is provided between the CAN receive pin and the preset single-chip microcomputer; a third capacitor and a fourth capacitor connected in series are provided between the preset single-chip microcomputer and the communication level adjustment pin, and the third capacitor and the fourth capacitor are connected in parallel with the second resistor;
[0007] It further includes a fixed voltage connected in parallel with the communication level adjustment pin, and the fixed voltage passes through the fourth capacitor to the ground.
[0008] Preferably, the first path of the isolated power output pin is connected to the vehicle communication isolation ground through a first ESD static diode; the second path of the isolated power output pin is connected to the vehicle communication isolation ground through a fifth capacitor and a sixth capacitor connected in parallel; the third path of the isolated power output pin is connected to the vehicle communication isolation ground through a filter and a seventh capacitor connected in series, and the seventh capacitor is in parallel with the fifth capacitor, the sixth capacitor, and the first ESD static diode, and the filter is in parallel with the first ESD static diode; the vehicle communication isolation ground pin is connected to the vehicle communication isolation ground.
[0009] Preferably, it further includes an inductance coil, and the second end and the third end of the inductance coil are respectively connected to the communication CANH pin and the communication CANL pin; the first end and the fourth end of the inductance coil are respectively connected to the vehicle communication CAN signal through a self - resetting fuse, and a second ESD static diode and a third ESD static diode connected in parallel are arranged between the self - resetting fuse and the vehicle communication isolation ground.
[0010] Preferably, a seventh capacitor connected to the vehicle communication isolation ground is arranged between the communication CANH pin and the second end of the inductance coil; an eighth capacitor connected to the vehicle communication isolation ground is arranged between the communication CANL pin and the third end of the inductance coil; the seventh capacitor and the eighth capacitor are in parallel.
[0011] Preferably, a ninth capacitor is further arranged between the communication CANH pin and the communication CANL pin.
[0012] Preferably, a third resistor and a jumper switch connected in series are arranged in parallel with the seventh capacitor.
[0013] A DC charging pile includes the CAN isolation communication circuit as described above.
[0014] The CAN isolation communication circuit and the corresponding DC charging pile provided by the present utility model are based on a main control IC module with a self - contained power supply and a corresponding auxiliary circuit. Among them, the self - contained power supply of the main control IC module can eliminate the independent isolation power supply in the existing solution, making the occupied space of the product smaller; at the same time, the communication speed reaches 1MPBS, and the isolation voltage reaches 2500V, which can efficiently realize CAN isolation communication; compared with the prior art, the communication is stable, the device cost is lower, and the production cost is effectively reduced. Brief Description of the Drawings
[0015] Figure 1 It is a schematic structural diagram of the main control IC module in the embodiment of the present utility model;
[0016] Figure 2 It is a schematic diagram of the principle of realizing the CAN isolation communication circuit in the embodiment of the present utility model. Detailed implementation manners
[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0018] Provide a CAN isolation communication circuit, which is applied in a DC charging pile, and its structural schematic diagram is as Figure 1 shown, and includes a master control IC module with its own power supply; the master control IC module includes a power supply pin Vcc, a CAN transmit pin TXD, a CAN receive pin RXD, and a ground pin GND1 connected to a preset single-chip microcomputer. The master control IC module also includes a communication CANH pin, a communication CANL pin, and a vehicle communication isolation ground pin GND2 connected to the electric vehicle. The master control IC module also includes an isolated power output pin Viso and a communication level adjustment pin Vccl; wherein, an isolation gate, that is, an Isolation Barrier, is formed between the CAN transmit pin, the CAN receive pin, and the communication level adjustment pin and the communication CANH pin and the communication CANL pin. Preferably, the master control IC module adopts CA-IS2062VW.
[0019] Specifically, in one implementation manner, as Figure 2 shown, U5 represents the master control IC module, the power supply of its power supply pin is 5V, and the ground pin is GND1. A first capacitor C30 and a second capacitor C33 are connected in parallel between the power supply pin and the ground pin. It can be understood that the other ends of the first capacitor C30 and the second capacitor C33 are respectively connected to the ground GND.
[0020] The pins of the preset single-chip microcomputer correspond to C1T and C1R, and are respectively connected to the CAN transmit pin TXD and the CAN receive pin RXD. Among them, a first resistor R13 is provided between the CAN transmit pin and C1T; a second resistor R14 is provided between the CAN receive pin and C1R; a third capacitor C39 and a fourth capacitor C41 connected in series are provided between C1R and the communication level adjustment pin Vccl, and the third capacitor C39 and the fourth capacitor C41 are connected in parallel with the second resistor R14; at the same time, a fixed voltage of 3.3V is connected in parallel with the communication level adjustment pin Vccl, and the fixed voltage of 3.3V passes through the fourth capacitor C41 between the ground GND. In addition, a tenth capacitor C38 is also provided between C1T and the ground GND.
[0021] The first path of the isolated power output pin Viso is connected to the vehicle communication isolated ground GND_CAN1 through the first ESD electrostatic diode ESD20; the second path of the isolated power output pin Viso is connected to the vehicle communication isolated ground GND_CAN1 through the fifth capacitor C32 and the sixth capacitor C34 connected in parallel; the third path of the isolated power output pin Viso is connected to the vehicle communication isolated ground GND_CAN1 through the filter FB32 and the seventh capacitor C37 connected in series, and the seventh capacitor C37 forms a parallel relationship with the fifth capacitor C32, the sixth capacitor C34, and the first ESD electrostatic diode ESD20, and the filter FB32 forms a parallel relationship with the first ESD electrostatic diode ESD20; the vehicle communication isolated ground pin GND2 is connected to the vehicle communication isolated ground GND_CAN1.
[0022] Further, it further includes an inductance coil L2, and the inductance coil adopts B82793S0513N201. The second end 2 and the third end 3 of the inductance coil are respectively connected to the communication CANH pin and the communication CANL pin; the first end 1 and the fourth end 4 of the inductance coil are respectively connected to the vehicle communication CAN signals CAN1_H and CAN1_L through the self - reset fuses F1 and F2, and a second ESD electrostatic diode ESD1 and a third ESD electrostatic diode ESD2 connected in parallel are arranged between the self - reset fuses F1, F2 and the vehicle communication isolated ground GND_CAN1. Preferably, the self - reset fuse adopts SMD1210B010TF.
[0023] Further, a seventh capacitor C522 connected to the vehicle communication isolated ground GND_CAN1 is arranged between the communication CANH pin and the second end 2 of the inductance coil L2; an eighth capacitor C523 connected to the vehicle communication isolated ground GND_CAN1 is arranged between the communication CANL pin and the third end 3 of the inductance coil L2; the seventh capacitor C522 and the eighth capacitor C523 form a parallel relationship. On this basis, a ninth capacitor C35 is also arranged between the communication CANH pin and the communication CANL pin.
[0024] Further, a third resistor R15 and a jumper switch JP1 connected in series are arranged in parallel with the seventh capacitor C522. Among them, JP1 is a 2P single - row pin header. Preferably, an eleventh capacitor C524 is arranged between the first end 1 and the fourth end 4 of the inductance coil L2.
[0025] Taking CA - IS2062VW as an example, it comes with its own power supply. Therefore, there is no need to use an isolated power supply, which makes the occupied space smaller, and the communication speed reaches 1MPBS, and the isolation voltage reaches 2500V.
[0026] A DC charging pile includes the CAN isolation communication circuit as described above. Understandably, other auxiliary circuits related to the DC charging pile and the CAN isolation communication circuit are all prior arts and will not be elaborated here.
[0027] The above is an elaboration of the CAN isolation communication circuit and the corresponding DC charging pile of the present utility model to help understand the present utility model; however, the implementation manners of the present utility model are not limited by the above embodiments. Any changes, modifications, substitutions, combinations, and simplifications made without departing from the principle of the present utility model shall be equivalent replacement manners and are all included in the protection scope of the present utility model.
Claims
1. A CAN isolation communication circuit, characterized in that, The CAN isolation communication circuit is applied in a DC charging pile and includes a master control IC module with its own power supply. The master control IC module includes a power supply pin, a CAN transmit pin, a CAN receive pin, and a ground pin connected to a preset single-chip microcomputer. The master control IC module further includes a communication CANH pin, a communication CANL pin, and a vehicle communication isolation ground pin connected to an electric vehicle. The master control IC module further includes an isolated power supply output pin and a communication level adjustment pin. Among them, an isolation gate is formed between the CAN transmit pin, the CAN receive pin, and the communication level adjustment pin and the communication CANH pin and the communication CANL pin.
2. The CAN isolation communication circuit according to claim 1, characterized in that The power supply of the power supply pin is 5V, and a first capacitor and a second capacitor are connected in parallel between the power supply pin and the ground pin.
3. The CAN isolation communication circuit according to claim 1, characterized in that, A first resistor is provided between the CAN transmit pin and the preset single-chip microcomputer; a second resistor is provided between the CAN receive pin and the preset single-chip microcomputer; a third capacitor and a fourth capacitor connected in series are provided between the preset single-chip microcomputer and the communication level adjustment pin, and the third capacitor and the fourth capacitor are connected in parallel with the second resistor. It further includes a fixed voltage connected in parallel with the communication level adjustment pin, and the fixed voltage passes through the fourth capacitor to the ground.
4. The CAN isolation communication circuit according to claim 1, wherein The first path of the isolated power supply output pin is connected to the vehicle communication isolation ground through a first ESD static diode; the second path of the isolated power supply output pin is connected to the vehicle communication isolation ground through a fifth capacitor and a sixth capacitor connected in parallel; the third path of the isolated power supply output pin is connected to the vehicle communication isolation ground through a filter and a seventh capacitor connected in series, and the seventh capacitor forms a parallel relationship with the fifth capacitor, the sixth capacitor, and the first ESD static diode, and the filter forms a parallel relationship with the first ESD static diode; the vehicle communication isolation ground pin is connected to the vehicle communication isolation ground.
5. The CAN isolation communication circuit according to claim 1, characterized in that, It further includes an inductance coil. The second end and the third end of the inductance coil are respectively connected to the communication CANH pin and the communication CANL pin; the first end and the fourth end of the inductance coil are respectively connected to the vehicle communication CAN signal through self-resetting fuses, and a second ESD static diode and a third ESD static diode are provided in parallel between the self-resetting fuses and the vehicle communication isolation ground.
6. The CAN isolation communication circuit according to claim 5, characterized in that A seventh capacitor connected to the vehicle communication isolation ground is provided between the communication CANH pin and the second end of the inductance coil; an eighth capacitor connected to the vehicle communication isolation ground is provided between the communication CANL pin and the third end of the inductance coil; the seventh capacitor and the eighth capacitor form a parallel relationship.
7. The CAN isolation communication circuit according to claim 6, wherein A ninth capacitor is further provided between the communication CANH pin and the communication CANL pin.
8. The CAN isolation communication circuit according to claim 6, wherein A third resistor and a jumper switch connected in series are provided in parallel with the seventh capacitor.
9. The CAN isolation communication circuit according to claim 6, characterized in that, An eleventh capacitor is provided between the first end and the fourth end of the inductance coil.
10. A DC charging pile, characterized in that, It includes the CAN isolation communication circuit according to any one of claims 1 to 9.