EMI filtering with a single chip
Production line engineer Liu was recently overwhelmed by return orders—the inverter's conducted interference consistently exceeded standards, and the UU common mode inductor was practically useless at high frequencies. He reworked the system with a vertical plug-in common mode inductor, but the assembly density exceeded the standard, earning a customer rejection. He used a power line common mode choke for three months, but every EMC test was still a blind-box experience. It wasn't until he replaced the power module with a ring common mode inductor that this vicious cycle was finally broken.
Three Key Features
① 360° fully shielded structure, 70% higher interference absorption above 200MHz
② Ceramic core with temperature resistance of -40°C to 155°C, and inductance degradation of <5% over ten years
③ Compatible with both direct-plug and horizontal mounting, eliminating the need for traditional Power Line Common Mode Choke mounting brackets
Test results at an automotive electronics factory:
1. Motor controller conducted interference reduced by 18dB
2. 38% less board space saved compared to UU Common Mode Inductors
3. Three-year repair rate reduced from 7.2% to 0.3%
Operation and Maintenance Tips
1. Avoid 3mm of the core during soldering to prevent heat damage
2. Clean dust from the annular winding slots monthly with an air gun
3. Use potting compound to enhance sealing in humid environments
