Importance

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Abstract

Electronic control circuit for use with electrical load powering apparatus having a load connection, a high voltage supply connection and a common, and with an electronic switch to switch the high voltage supply connection to the load connection. The electronic switch has an input and is responsive to a voltage difference between the input and the load connection. The load connection is subject to high voltage excursions relative to the common due to the switching. The electronic control circuit includes a transformer having a primary winding and a secondary winding for providing at least one pulse output from the secondary winding, the transformer having an inherent interwinding capacitance between the primary winding and the secondary winding. A circuit connected to the secondary winding couples the pulse output from the secondary winding between the input of the electronic means and the load connection when the pulse output is present. A high voltage excursion on the load connection charges the inherent interwinding capacitance to a high voltage level when the pulse output is present. The electronic control circuit further includes circuitry for bypassing the high voltage level on the inherent interwinding capacitance of the transformer to the load connection when the pulse output and each high voltage excursion cease. An electronically commutated motor system, a switching regulator power supply and methods of operation are also disclosed.

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First Claim