With the rapid growth of the vehicle market, the applications of technologies such as ADAS, autonomous driving, V2X and vehicle information systems continue to expand. These advanced technologies require processing large amounts of information, so signals are processed internally at an ever-increasing rate. As the number of components increases and the installation density increases, miniaturization has become an inevitable requirement for development. In addition, in order to adapt to the widespread application of wireless communication technology that can realize high-speed information transmission, the demand for processing higher frequency noise has also increased accordingly.
Common mode choke coils have shown excellent results in reducing radiated noise from power lines. Traditionally, noise reduction in automotive equipment power lines has focused on the AM and FM frequency bands, using larger components to cope with low-frequency noise. However, with the rapid advancement of in-vehicle technology, there is an urgent need for effective noise reduction solutions for high-frequency noise beyond the AM and FM frequency bands.
In response to this market demand, Murata Manufacturing Co., Ltd. has launched the common mode choke coil DLW32PH122XK2, which is specially designed for miniaturization and high-frequency noise reduction. The article will next introduce the performance of DLW32PH122XK2 in reducing noise.
Radiated noise reduction effect of common mode choke coil
In order to test the noise reduction effect of the common mode choke coil, we set up the following measurement system: First, operate in compliance with the automotive international noise control standard CISPR25. The noise generated by the EUT was analyzed through experimental observations in the range of 200MHz to 800MHz. The results show that the noise in this frequency range is significantly reduced by using the DLW32PH122XK2.
The noise evaluation results show that under the conditions of vertical polarization wave and AVE detection, the common mode choke coil showed obvious noise reduction effect in the BCI test. The BCI test is designed to verify the device's tolerance to external noise. If the device's noise immunity is poor, even slight noise may cause the device to malfunction. We tested the insertion effect of DLW32PH122XK2, and the results proved that it significantly improved the device's tolerance to noise and effectively reduced the occurrence of malfunctions.
Summarize
With the continuous advancement of in-vehicle technology, the need to reduce noise of hundreds of MHz is becoming increasingly urgent. Compared with the traditional common mode choke coil for power lines, the DLW32PH122XK2 common mode choke coil shows better performance in high-frequency noise reduction performance, effectively dealing with the noise problem of hundreds of MHz. By introducing this advanced solution, we can better meet the noise control needs of modern in-vehicle equipment and promote the development of in-vehicle technology in a more efficient and safer direction.