Induction cooktops and RFI?

[Terry Fox]

From: Andre Kesteloot 
Sent: Thursday, April 12, 2012 6:59 PM
To: tacos at amrad.org ; Terry & Judy Fox 
Subject: Re: Induction cooktops and RFI?

On 4/12/2012 18:31 PM, Terry Fox wrote: 
  Does anyone use an induction cooktop, and can tell me if there is any RFI from it to ham bands?
  Thanks
  Terry, WB4JFI




Terry, 

We don't have an induction cook-top, but
isn't the induction coil powered by the 60Hz mains ?
73
André

I was more worried about the control circuitry, and if there is a solid-state switching of the element.  Since induction is designed to radiate a magnetic field (albeit at 60Hz?), if that field is controlled by higher-speed devices, there might me more radiation?  Or not.. 

Do they do PWM for the control?  It also seems that there are a lot more “steps” in the control than a traditional electric cooktop.
Terry
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