Patent ID: 8242705
Filing Date: 2012-08-14
Classification: H05B,Y02B

Abstract:
1. An electronic control gear (ECG) for a high intensity discharge (HID) lamp, comprising: a function generator that receives an input signal, wherein the input signal operates the lamp, wherein the function generator frequency modulates the input signal to generate a frequency modulated output signal that drives an arc of the lamp, wherein the frequency modulation of the input signal by the function generator sweeps continuously between a low frequency modulation and a high frequency modulation, wherein the low frequency modulation has a modulation frequency f a power amplifier that receives the frequency modulated output signal from said function generator and changes an amplitude of the frequency modulated output signal during at least one of the high and low frequency modulations so that a current amplitude of the frequency modulated output signal is substantially constant; and a variable gain transformer that receives the frequency modulated output signal from said power amplifier and adjusts a voltage of this signal during starting of the lamp.