Koninklijke Philips Corporation N.v.

Gerlach Corne Pieter Maria Emmen

Lukas Leyten

Roy Hendrik Anna Maria Van Zundert

Oscar Jan Deurloo

Subramanian Muthu

Christofher Daniel Charles Hooijer

Wouter Edgard Koen Broeckx

A method of electronic ballast protection including providing an electronic ballast having an AC/DC converterwith an electronic ballast input and a mains voltage connectionconnectable to a mains voltage, an inverteroperably connected to the AC/DC converterand having an electronic ballast outputconnectable to a lamp, a control circuitcontrolling the inverter, and a low voltage power supplyproviding low voltage power to the control circuit; supplying power to the low voltage power supplyfrom the electronic ballast input when the mains voltage connectionis wired to mains voltage; and disconnecting the power to the low voltage power supplywhen the electronic ballast outputis wired to the mains voltage

Electronic ballast protection

A driver for HID lamps includes four switches and generates a constant DC-current that is commutated at a low frequency. The driver includes a filter capacitor. The occurrence of peak currents due to the charging or discharging of the filter capacitor is prevented by driving one of the switches at a high frequency immediately after commutation.

Circuit arrangement for preventing high peak currents

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Ravels-Eel, Belgium

Gerlach Corne Pieter Maria Emmen