NDLI: High-power-factor electronic ballast zero voltage switching and low dv/dt with combination of charge pump and valley fill based on class DE

Content Provider	IET Digital Library
Author	Thongkullaphat, Sarayoot Liutanakul, Pisit Chunkag, Viboon
Abstract	In this study, for application of 36 W/220 Vrms/50 Hz fluorescent lamp, a high performance of high-power-factor and low line input current harmonics of electronic ballast is proposed. The proposed ballast has a structure based on a combination of charged pump and valley fill circuit. By adding paralleled capacitors to each power switch and setting the circuit parameters, operation modes of the inverter can be modified from single-stage conventional class D to a class DE. Consequently, duty ratio can be reduced by up to 25% so that the voltage stress at power switch is lower when compared with the conventional class D inverter. Furthermore, switching power loss and dv/dt can also be reduced because of zero voltage switching condition. Details of design and circuit operation are described. The experimental results of prototype circuit, operated around 50 kHz of switching frequency at full power output, show that the proposed ballast has 94.48% of efficiency, 4.30% of THDi, 0.996 of input power factor and 1.38 of lamp current crest factor.
Starting Page	3182
Ending Page	3190
Page Count	9
ISSN	17554535
Volume Number	7
e-ISSN	17554543
Issue Number	Issue 12, Dec (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/7/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2014.0073
Journal	IET Power Electronics
Publisher Date	2014-11-07
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Capacitor Charge Pump Charge Pump Circuit Class D Inverter Class DE Efficiency 94.48 Percent Fluorescent Lamp Fluorescent Lamps Frequency 50 Hz High-power-factor Electronic Ballast Zero Voltage Switching Inverter Lamp Accessories Lamp Current Crest Factor Light Source Low Line Input Current Harmonics Paralleled Capacitor Power 36 W Power Converter Power Electronics Power Factor Power Supplies to Apparatus Power Supply Power Switch Relay And Switches Supervisory Circuit Switched Mode Converter Switching Converter Valley Flll Circuit Voltage 220 V Voltage Stress Zero Voltage Switching
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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