Koninklijke Philips Corporation N.v.

Johan Anton Hendrikx

Paul R Veldman

Bernhard Christiaan Van Dijk

Severin Luc Ramses Harvey

Franciscus Nicolaas Kockx

Henri Arnoud Ignatius Melai

In an up-converter supplied by the mains supply and operating in the critical mode, the on-time of the switching element () is modulated so that it is increased in the vicinity of the zero crossings of the mains supply voltage. As a result the THD is lowered.

Circuit arrangement

In an up-converter a switching element is controlled both by an integrated control circuit and by a secondary winding on an inductor. High power factor and low total harmonic distortion are achieved while the design of the integrated control circuit is comparatively simple.

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Eindhoven, Netherlands

Johan Anton Hendrikx