Title :
An improved “charge pump” electronic ballast with low THD and low crest factor
Author :
Chen, Wei ; Lee, Fred C. ; Yamauchi, Tokushi
Author_Institution :
Bradley Dept. of Electr. Eng., Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA
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 because it eliminates the use of a bulky boost inductor. However, this 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, very 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; THD; charge pump electronic ballast; charging capacitor; clamping diodes; crest factor; fluorescent lamps; high frequency AC source; input current; power factor correction; total harmonic distortion; Capacitors; Circuit topology; Clamps; Diodes; Electronic ballasts; Fluorescent lamps; Frequency; Inductors; Power factor correction; Total harmonic distortion;
Conference_Titel :
Applied Power Electronics Conference and Exposition, 1996. APEC '96. Conference Proceedings 1996., Eleventh Annual
Conference_Location :
San Jose, CA
Print_ISBN :
0-7803-3044-7
DOI :
10.1109/APEC.1996.500505
