CAN communication isolation module
By combining a DC-DC step-down circuit and an optocoupler isolation circuit, power supply and signal isolation of the CAN signal are achieved, solving the problem of CAN communication being susceptible to interference in complex environments and improving the communication stability between devices.
Patent Information
- Application Number
- CN202520005288.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2035-01-02
AI Technical Summary
CAN communication is susceptible to interference in complex network environments, leading to erroneous frames and frame loss, and even causing module crashes or burnouts, affecting the stable communication of the entire vehicle or ship system.
A combination of a DC-DC step-down circuit, a 5V isolation power supply circuit, and an optocoupler isolation circuit is used to achieve signal isolation, ensuring power isolation between CAN signal input and output. Signal isolation is further achieved through an optocoupler chip, forming a unidirectional CAN communication isolation module.
It improves the stability of CAN communication, reduces signal crosstalk, ensures stable communication between devices, and avoids the risk of module crashes or burnout.
Smart Images
Figure CN223681057U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to communication technology, concretely a kind of CAN communication isolation module. BACKGROUND
[0002] Due to the function gradually increasing of whole vehicle or whole ship, its network is more and more complex, and the communication amount needed also increases sharply. In the field environment, there are many factors causing CAN communication to be abnormally disturbed, leading to error frame and frame loss when CAN transceiver transmits and receives message, and more seriously, it can cause CAN communication module to crash or burn. For example, CAN bus is often mounted with different devices, and when they are powered on together, due to signal crosstalk from the devices, abnormal common-mode signal superposition can be easily generated on CAN_H and CAN_L, which leads to communication abnormality. In addition, in the actual CAN bus wiring, it is often necessary to mix with strong current due to too small space, and CAN line and driving line are mixed together, which results in great interference. As long as the driving line parallel to CAN has a current change of 2A / s, a strong magnetic field will be coupled out to cause interference pulses on CAN line. In addition, there are other factors causing CAN communication abnormality. Stable communication is very important for whole vehicle or whole ship system, and how to ensure the stability of communication is a difficult problem faced by current CAN communication. SUMMARY
[0003] The utility model aims at the shortage of prior art, and provides a kind of CAN communication isolation module. This module is simple to use, small in size, easy to install and can improve the stability of CAN communication.
[0004] The technical scheme for realizing the utility model is as follows:
[0005] A kind of CAN communication isolation module, including DC-DC step-down circuit and the first 5V isolation power supply circuit, second 5V isolation power supply circuit connected with DC-DC step-down circuit, DC-DC step-down circuit is externally connected 24V direct current voltage, the first 5V isolation power supply circuit is connected with CAN signal input circuit and photo-coupler isolation circuit, the second 5V isolation power supply circuit is connected with CAN signal output circuit and photo-coupler isolation circuit, CAN signal input circuit, photo-coupler isolation circuit and CAN signal output circuit are sequentially connected.
[0006] The DC-DC step-down circuit uses XL1509-5.0E1.
[0007] The first 5V isolation power supply circuit and the second 5V isolation power supply circuit are both B0505S-1WR3.
[0008] The CAN transceiver chip in the CAN signal input circuit and the CAN signal output circuit is TJA1050T.
[0009] The logic output optocoupler chip in the optocoupler isolation circuit is 6N137-500E.
[0010] The isolation module in the technical solution is a one-way communication CAN communication isolation module, which is used between two devices with CAN communication, and an external input 24V DC voltage is adopted to reduce the voltage through a DC-DC step-down circuit, convert 24V into 5V, then isolate 5V through a first 5V isolation power supply circuit and a second 5V isolation power supply circuit, so as to isolate the power supply of the CAN signal input circuit and the CAN signal output circuit, then isolate the input and output signals of the CAN through a logic output optocoupler chip in the optocoupler isolation circuit, so as to isolate the CAN communication between the two devices and greatly improve the stability of the CAN communication.
[0011] The module is simple to use, small in size, easy to install and capable of improving the stability of the CAN communication. DETAILED DESCRIPTION
[0012] Figure 1 It is a circuit principle schematic diagram in the embodiment;
[0013] Figure 2 It is a circuit structure schematic diagram in the embodiment. DETAILED DESCRIPTION
[0014] The content of the utility model will be further described below in combination with the drawings and embodiments, but is not limited to the utility model.
[0015] Embodiment:
[0016] Reference Figure 1 A CAN communication isolation module, comprising a DC-DC step-down circuit and a first 5V isolation power supply circuit 1 and a second 5V isolation power supply circuit 2 connected with the DC-DC step-down circuit respectively, the DC-DC step-down circuit is externally connected with a 24V DC voltage, the first 5V isolation power supply circuit 1 is connected with a CAN signal input circuit and an optocoupler isolation circuit, the second 5V isolation power supply circuit 2 is connected with a CAN signal output circuit and the optocoupler isolation circuit, and the CAN signal input circuit, the optocoupler isolation circuit and the CAN signal output circuit are sequentially connected.
[0017] The DC-DC step-down circuit in the example adopts XL1509-5.0E1.
[0018] The first 5V isolation power supply circuit 1 and the second 5V isolation power supply circuit 2 in the example are both B0505S-1WR3.
[0019] The CAN transceiver chip in the CAN signal input circuit and the CAN signal output circuit in the example is TJA1050T.
[0020] The logic output optocoupler chip in the optocoupler isolation circuit is 6N137-500E.
[0021] In this example, as shown in Figure 2 CAN_H and CAN_L of the CAN bus are connected to the CAN_H and CAN_L input ends of the CAN communication isolation module, and the CAN_H and CAN_L isolated by the CAN communication isolation module are connected to the CAN_H and CAN_L of the device end, so as to achieve the communication isolation between the devices, reduce the signal crosstalk of the device CAN to the CAN bus, and improve the stability of the communication.
Claims
1. A CAN communication isolation module, characterized in that, The DC-DC step-down circuit is externally connected with 24V direct current voltage, the first 5V isolation power supply circuit is connected with the CAN signal input circuit and the optical coupling isolation circuit, the second 5V isolation power supply circuit is connected with the CAN signal output circuit and the optical coupling isolation circuit, and the CAN signal input circuit, the optical coupling isolation circuit and the CAN signal output circuit are sequentially connected.
2. The CAN communication isolation module of claim 1, wherein, The DC-DC step-down circuit adopts XL1509-5.0E1.
3. The CAN communication isolation module of claim 1, wherein, The first 5V isolation power supply circuit and the second 5V isolation power supply circuit are both B0505S-1WR3.
4. The CAN communication isolation module of claim 1, wherein, The CAN transceiver chip in the CAN signal input circuit and the CAN signal output circuit is TJA1050T.
5. The CAN communication isolation module of claim 1, wherein, The logic output optical coupling chip in the optical coupling isolation circuit is 6N137-500E.