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Abstract
In order to ensure the vehicle management system (VMS) satisfy the RE and CE standards which are required by national regulations, the EMC design method is necessary to be integrated into the controller PCB design flow. Through filtering for signal line and decoupling for power system on VMS based on MPC555, the properties of VMS’ EMC are improved. With spectrum analyzer and EMSCAN near-field scanner, the feasibility of Antiinterference measures is verified. The VMS passed the CE test level 5 and the RE test level 4 in CISPR25: 2002.
Highlights
Vehicle Management System, as a command Management Center of vehicle, it accepts the driver's pedal signals and other signals, and makes the appropriate judgments, controls the lower levels components to work, so that lets car drive normally and achieve higher energy efficiency as far as possible
The working circuit board is in near-field scanning using EMSCAN
In the EMC research process of a vehicle management system (VMS) sample, we found that the main noise sources in circuit board are the signal lines which from power supply pins of microcontroller and some signal pins
Summary
In the EMC research process of a VMS sample, we found that the main noise sources in circuit board are the signal lines which from power supply pins of microcontroller and some signal pins. With series connection of low pass filter on DC signal and low resistance on clock/data line, the high frequency components of noise current on signal line can be greatly reduced, thereby they have less possibility to become the noise sources. Figer. the noise voltage spectrum of MCU reset signal line 0Ω resistor is replaced with 1KΩ resistor and the circuit board is near-field scanning again using EMSCAN. Using the voltage probe to measure the noise voltage of reset signal which through low-pass filter, it is can be seen that the noise voltage amplitude of signal line in the whole spectrum have been significantly reduced(Fig.). Spectrum synthetic map Figer. the results of Near-field scanning circuit board for reset signal with low-pass filtering. Figer. the noise voltage spectrum of MCU reset signal line after low-pass filtering. The amplitude of background noise here is only as a reference
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