자동차 전장품 EMC규제에 따른 PCB설계 및 해석

As more vehicles equipped with advanced electronic control system recently, more consider for the electromagnetic wave effect and safety are needed in the car. The unnecessary electromagnetic waves which are from the antenna, electricity and other electronic devices can cause direct problems to the automotive component's safety and performance. In this paper, we used the real car audio products to simulate PCB regarding the general PCB design. and we compared the RE(Radiated Emission) Test result (CISPR 25 standard of EMC relating automotive components) with Simulation Result. According to the EMC RE Test result, car audio board failed to CISPR 25 standard while the resonance occurred at 15 point and noise of every point is over compared to the standard regulation level (24㏈). Hence we got rid of the resonance point by getting Return Path, Via, Decap tuning and decreased impedance under 10 ohms. After we confirmed that EMC Test result improved a lot due to the power stabilization.