Phase control switch with reduced heat dissipating rfi inductor

Details Phase control switch with reduced heat dissipating rfi inductor Phase control switch with reduced heat dissipating rfi inductor

H - Electricity

03

K

H03K 17/00 (2006.01) G05F 5/00 (2006.01)

Patent

CA 2334303

A phase control switch with an RFI suppression inductor includes a first winding on the inductor in series with a triac. A first capacitor is in parallel across the series combination of the first winding and triac. The switch further includes a second winding on the inductor with a second capacitor connected in parallel across the second winding. When the second capacitor and second winding resonate, a Q rise in flux occurs in the inductor core, intercepting the flux in the first winding to produce a greater voltage drop across the first winding and a corresponding decrease in the rate of current rise in the triac. Fewer turns are needed in the first winding for proper RFI suppression, resulting in a smaller device.

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