FAQ
Technical FAQs for Power Magnetics
This FAQ hub answers the most common technical questions from power engineers, buyers, and sourcing teams—covering topics such as inductance behavior, saturation current, core materials, EMI, reliability, and production processes.
All answers are written to support application-based design decisions and guide users toward the most suitable Coilmaster solutions.
Higher switching frequencies reduce output ripple and allow smaller components but increase core and AC copper losses. Inductors must be designed with suitable core materials and winding structures to handle...
Read moreMolded inductors are preferred when low EMI, mechanical robustness, and thermal stability are required—such as in headlamp drivers, matrix lighting, and compact lighting control modules where space is limited...
Read moreAuxiliary DC-DC power rails supply door modules, HVAC controllers, body control modules, and comfort systems that operate continuously across the vehicle. Stable power delivery ensures consistent system...
Read moreBody electronics are connected through long wiring harnesses and shared grounds. Switching noise or magnetic leakage from inductors can propagate through the vehicle, interfering with sensors, control...
Read moreInductors with high DCR or unstable inductance increase thermal stress inside compact modules. Over time, this can accelerate aging of nearby components and solder joints. Automotive-grade inductors with...
Read moreAuxiliary rails support many distributed body modules rather than one centralized controller. They must handle variable loads, cable losses, and transient events from motors, relays, and actuators, making...
Read moreLong harnesses act as antennas. Noise from DC-DC converters can couple into these cables and radiate throughout the vehicle, affecting other systems. Inductors with poor shielding can significantly worsen...
Read moreHigh DCR increases copper loss, raising internal temperature in compact enclosures. This can lead to accelerated aging of capacitors, connectors, and ICs. Low-DCR inductors help maintain safe operating...
Read moreLoads in body modules change constantly as windows, locks, heaters, and lighting turn on and off. Inductors must maintain stable inductance under varying current to prevent voltage dips and control-loop...
Read moreThese modules are exposed to vibration, shock, and repeated motion. Weak terminations or unstable winding structures can lead to micro-cracks or intermittent connections over time.
Read moreAs DC current increases, inductance drops. If this behavior is not controlled, output ripple increases and voltage regulation worsens, especially when multiple subsystems draw power simultaneously.
Read moreWhen DC-DC converters are placed near wiring harnesses, communication lines, or sensitive electronics, shielded or molded inductors help reduce EMI and improve system-level EMC performance.
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