Title :
An improved “charge pump” electronic ballast with low THD and low crest factor
Author :
Chen, Wei ; Lee, Fred C. ; Yamauchi, Tokushi
Author_Institution :
Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
fDate :
9/1/1997 12:00:00 AM
Abstract :
The “charge pump” electronic ballast circuit, which employs a charging capacitor and a high-frequency AC source to implement power factor correction (PFC), has become an attractive topology for ballasting fluorescent lamps. However, the basic “charge pump” electronic ballast circuit has the problems of high total harmonic distortion (THD) of the input current and high crest factor (CF) of the lamp current. This paper analyzes the origin of the problems and proposes a novel solution. With the addition of two small clamping diodes, good input current (PF>0.99, THD<5%) and lamp current (CF<1.6) can be obtained with open-loop control. Experimental results are provided for verification
Keywords :
PWM power convertors; field effect transistor switches; fluorescent lamps; harmonic distortion; lamp accessories; power MOSFET; power factor correction; power field effect transistors; power semiconductor diodes; power semiconductor switches; power system harmonics; switching circuits; boost PWM power convertor; charge pump electronic ballast; charging capacitor; clamping diodes; crest factor; fluorescent lamps; high-frequency AC source; input current; lamp current; open-loop control; power MOSFET switches; total harmonic distortion; Capacitors; Charge pumps; Circuit topology; Electronic ballasts; Fluorescent lamps; Power factor correction; RLC circuits; Switches; Switching circuits; Voltage;
Journal_Title :
Power Electronics, IEEE Transactions on
