Kirton McConkie
Electronic ballast with real-time current crest factor improvement function
An electronic ballast includes a converter, an inverter circuit, a controlling unit, and a current crest factor improvement circuit. The controlling unit issues a first control signal to control the converter and issues a second control signal and a third control signal with opposite enabling/disabling states to control on/off states of corresponding switch elements of the inverter circuit. During a dead time between the enabling state of second control signal and the enabling state of the third control signal, these switch elements are simultaneously in the off state. During the dead time, the current crest factor improvement circuit is triggered to generate a restraining signal. According to the restraining signal, an output power of the converter is decreased to a predetermined value in real time or the converter is suspended.
Delta Electronics, Inc.
Y H
Y10S H05B
additional inventional
Chang-Ching Weng-Fatt Chin-Ho Chih
Wang Chan Chou Lo