FCC Filtering Requirements

Hi, anderby,

For High-Frequency Induction Heating Machines ( 450 KHz ) they have provided RF filters at the mains . ( Both EMA and Philips Make ) . These are Induction heating equipment with RF generators of 450 KHz to provide HF supply to inductors used for Induction heating. These filters are LC ( with 2 parallel capacitors on either side of inductance. Now I do not remember the exact value of L and C ) These mains RF filters with VA ratings and frequency to the actual requirement are commercially available.

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you need a multi stage enclosed filter, like two corcoms in series fully enclosed in conducting boxes with a trap for 430 Khz within the device. Many signal generators do this.

This type of filter is called 'low pass', Ac up to 120 hertz gets through. The first filter brings the 430 Khz down 40-50 Db. You then have a bypass filter that allows highs of 430 Khz to go to ground. (this is usually a number of capacitors of the correct capacitance and voltage rating), then the second corcom, and you should be well down and meet FCC. Your box will have to be metal with internal copper plate or be an aluminum box. Steel is often not good enough. Additionally the internal oscillator and amplifiers can be placed in their own boxes. Meshed aluminum sheet full of small holes is used to allow cooling air to circulate.

And competent signal generator maker will be able to put this together quickly

thank you for your feed back and suggestions.