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CAN (Controller Area Network) analysis circuit and method for new energy vehicles

A technology of new energy vehicles and circuits, which is applied in the field of CAN analysis circuits of new energy vehicles, can solve the problems of signal safety and reliability, insufficient fault tolerance, interference signals and static interference, etc., and achieve the suppression of electromagnetic waves from radiating outward , Improve the anti-interference ability, improve the effect of transmission quality

Inactive Publication Date: 2018-11-06
BEIDOU AEROSPACE AUTOMOBILE BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of high-speed signal transmission, there are a lot of interference signals and static interference, which brings great trouble to the later signal processing
The existing CAN analysis circuit has poor anti-interference performance and serious shortage of fault tolerance, which has a great impact on the safety and reliability of signal transmission at high speed

Method used

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  • CAN (Controller Area Network) analysis circuit and method for new energy vehicles
  • CAN (Controller Area Network) analysis circuit and method for new energy vehicles
  • CAN (Controller Area Network) analysis circuit and method for new energy vehicles

Examples

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Embodiment 1

[0039] See figure 1 As shown, a CAN analysis circuit for a new energy vehicle includes a CAN transceiver and a common mode inductor; the CAN transceiver is provided with a transmitting terminal 1 for sending CAN parameter signals to a central controller and a receiving center The receiving terminal 4 of the control signal sent by the processor is also provided with a high voltage terminal 7 and a low voltage terminal 6; the common mode inductor includes a first inductor L1 and a second inductor L2 arranged in common mode induction; The first end a of the first inductor L1 is connected to the high voltage end 7, and the second end b of the first inductor L1 is used to connect to the high voltage signal line of the CAN bus; the second end of the second inductor L2 One end c is connected to the low voltage end 6, and the second end d of the second inductor L2 is used to connect to the low voltage signal line of the CAN bus.

[0040] The CAN analysis circuit for new energy vehicles i...

Embodiment 2

[0041] Embodiment 2. This embodiment is improved on the basis of Embodiment 1. The content described in Embodiment 1 is also included in this embodiment, and will not be detailed here.

[0042] See figure 2 As shown, the CAN analysis circuit for new energy vehicles further includes an anti-static protection diode unit, and the first end e of the anti-static protection diode unit is connected to the second end d of the second inductor L2, so The second terminal f of the anti-static protection diode unit is connected to the second terminal b of the first inductor L1, and the third terminal g of the anti-static protection diode unit is grounded. The anti-static protection diode unit includes a first anti-static protection diode D1 and a second anti-static protection diode D2. One end of the first anti-static protection diode D1 is connected to the second end d of the second inductor L2, so The other end of the first antistatic protection diode D1 is grounded; one end of the second ...

Embodiment 3

[0044] The third embodiment, this embodiment is improved on the basis of the first embodiment, and the content described in the first embodiment also has this embodiment, and will not be described in detail here.

[0045] See image 3 As shown, the CAN analysis circuit for new energy vehicles further includes a filter circuit, one end of the filter circuit is respectively connected to the second end b of the first inductor L1 and the second end of the second inductor L2 d connection, the other end of the filter circuit is connected to the reference signal terminal 5 of the CAN transceiver. The filter circuit includes a first resistor R1, a first capacitor C1, and a third capacitor C3; the first capacitor plate of the third capacitor C3 is connected to the reference signal terminal 5 of the CAN transceiver, and the third capacitor C3 The second capacitor plate of the first resistor R1 is connected to the ground; both ends of the first resistor R1 are respectively connected to the ...

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Abstract

The invention relates to the technical field of CAN (Controller Area Network) bus for new energy vehicles and in particular relates to a CAN analysis circuit and method for the new energy vehicles. The CAN analysis circuit comprises a CAN transceiver and a common mode inductor; a seventh end of the CAN transceiver is connected with a first input end of the common mode inductor; a sixth end of theCAN transceiver is connected with a second input end of the common mode inductor; a first output end and a second output end of the common mode inductor are connected with the CAN bus respectively. According to the CAN analysis circuit for the new energy vehicles, disclosed by the invention, the CAN transceiver and the common mode inductor are arranged; a common mode electromagnetic interference signal is filtered by utilizing the common mode inductor; meanwhile, an EMI (Electro Magnetic Interference) filtering effect is realized, and electromagnetic wave generated by a high-speed signal lineare prevented from being radiated and transmitted to the outer side; the anti-interference capability of the CAN analysis circuit is improved and the reliability of a signal in high-speed transmissionis ensured.

Description

Technical field [0001] The invention relates to the technical field of CAN analysis circuits for new energy vehicles, in particular to a CAN analysis circuit and analysis method for new energy vehicles. Background technique [0002] New energy vehicles are the main development direction of today's automotive field, and the quality of receiving and sending detection signals is the top priority of new energy vehicle electronic technology. The speed signal is a more important type of signal, but there are many signal sources: some come from the center of the engine. Some come from various speed sensors, so the signal quality varies greatly. [0003] The more conventional waveform of automobile speed signal is PWM square wave, and the voltage range is between 0V-24V. For conventional PWM signals, the analysis circuit is very simple, just use an integrated comparator chip, connect the threshold voltage (select the value between the peaks and valleys of the PWM) to the inverting input ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F13/40H02H9/04
CPCG06F13/4072H02H9/045
Inventor 刘贵生刘志钢苍海涛
Owner BEIDOU AEROSPACE AUTOMOBILE BEIJING CO LTD
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