Patent ID: 6181076
Filing Date: 2001-01-30
Classification: H05B,Y02B

Abstract:
A ballast circuit for use with a high intensity discharge lamp, comprising:a power source;an inverter circuit receiving DC power from the power source, the inverter circuit having at least one inverter control input;a transformer having a first winding electrically connected to an output of the inverter circuit, the transformer having a known leakage inductance;an output capacitor electrically connected to a second winding of the transformer, the output capacitor being structured and arranged to electrically connect to a lamp; anda control circuit electrically connected between the power source and the inverter circuit, the control circuit also being electrically connected to the at least one inverter control input to regulate power supplied to the lamp;wherein the leakage inductance is selected such that the leakage inductance of the transformer limits current to the lamp during a warm-up phase of operation.