Patent ID: 8143795
Filing Date: 2012-03-27
Classification: H05B

Abstract:
1. A circuit arrangement for starting a discharge lamp, comprising: a first and a second input terminal for connecting an input voltage; an inverter, which has an input and an output, the input being coupled to the first and the second input terminal and the output being coupled to a first and a second output terminal for connecting the discharge lamp; a resonant circuit including a resonant inductor, which is coupled between the output of the inverter and the first output terminal; a regulating apparatus for regulating the frequency of the signal provided at the inverter output; and a current measuring apparatus, which is arranged so as to measure a current which is correlated with the current in the resonant circuit, wherein the regulating apparatus is adapted to regulate the frequency at the output of the inverter as a function of the measured current, and wherein the regulating apparatus comprises: a first memory apparatus for storing a value which has been correlated with a maximum (I a comparison apparatus for comparing a value (I a writing apparatus for the case in which the value (I