Noise suppression technologies/case study introduction (Automotive)
For automotive LANs Suppression of noise in CANs using common mode choke coils (2) Radiated noise evaluation
■Evaluation system
| Measurement frequencies ： | 150 kHz to 1 GHz |
|---|---|
| Test standard ： | CISPR25 Ed.3 (150 kHz to 1 GHz) |
| DUT ： | CAN transceiver (made by company A) |
| Evaluation items ： | Common mode choke coils （DLW43SH510XK2） |
Radiated noise evaluation / Table of equipment used
■Evaluation results No filter used, 250 kHz pulses
■Evaluation results DLW43SH510XK2 used, 250 kHz pulses
A noise-suppression effect was achieved by adding the DLW43SH510XK2.
(Noise was reduced by 25.1 dB at a 20.5 MHz vertical polarized wave frequency.)
■Evaluation results No filter used, 500 kHz pulses
■Evaluation results DLW43SH510XK2 used, 500 kHz pulses
By adding the DLW43SH510XK2, a noise-suppression effect was achieved.
(Noise was reduced by 17.8 dB at a 21.0 MHz vertical polarized wave frequency.)
Summary of radiated noise evaluation effects
■250 kHz pulses
When no filter was used, a high level of noise was found from 150 kHz to 30 MHz.
By adding choke coil DLW43SH series, a noise-suppression effect was achieved.
The DLW43SH series achieved a noise-suppression effect of approx. 26 dB at a 20.5 MHz vertical polarized wave frequency.
■500 kHz pulses
When no filter was used, a high level of noise was found from 150 kHz to 30 MHz.
By adding choke coil DLW43SH series, a noise-suppression effect was achieved.
A noise-suppression effect of approx. 18 dB at a 21.0 MHz vertical polarized wave frequency was achieved.
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