50A 250VAc Line Emi Filter design For Audio

250VAC 50A emi power line filter rf shielding

EMI Filter Mounting Tips

The cables and wiring inside a system including the input power cables can act as an antenna for high-frequency noise (10’s of MHz and up) radiating them through the air as well as picking them. This can pose a serious challenge for mitigating radiated as well as high frequency conducted emissions. The higher frequency (10’s pf MHz and up) noise filtered by the filter circuit can couple back on the other side (cables) via the radiated mode. This makes the installation of the filter quite critical. Keeping the following EMI filter installation recommendations in mind can ensure proper EMI filter performance:

• Mount the filter in a place that requires the shortest cable runs.
• When the aim is noise mitigation, mount the filter as close to the EMI source as possible, whether it's a drive, uninterruptible power source, inverter or another component. The farther it is, the more wiring is available for noise to propagate.
• For EMI compliance, install the filter as close to the point of power entry (POE) as possible.
• Bulkhead mount the filter to the chassis at the point of power entry with proper shielding, creating good input-output isolation.
• If bulkhead mounting is not possible, keep wires/cables at the filter input as short as possible and shield the input cables, if necessary.
• For MIL applications, use the MIL grade connector directly installed on the filter box and bulkhead mount it to the chassis.
• Shield filter output cabling if it’s picking noise from inside the system.

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