Patent ID: 6137234
Filing Date: 2000-10-24
Classification: H05B

Abstract:
A circuit arrangement for igniting and supplying a discharge lamp, comprising:an inverter for generating a high-frequency output voltage at a frequency f from a DC power supply voltage, provided with inverter input terminals for connection of a DC power supply source supplying the DC power supply voltage, and inverter output terminals,a resonant circuit coupled to the inverter output terminals and comprising a series arrangement of a first inductive element and a first capacitive element,a load circuit shunting the first capacitive element and comprising a transformer having a primary winding and a secondary winding, and a lamp circuit which is provided with a series arrangement of lamp connection terminals and a second capacitive element and shunts the secondary winding,wherein the frequency f has a lower value during stationary lamp operation than the value fmin for which the phase shift between the current in the resonant circuit and the voltage across the resonant circuit is minimal.