文档介绍：A New HID Lamp Ballast
using Internal LC Resonance and Coupled Inductor Filter
Byoung-Chol Cho*, Sung-Jin Moon, In-Kyu Lee and . Cho
School of Electrical Engineering
Seoul National University, Seoul, Korea
Phone: + 82-2-880-7260, Fax: +82-2-878-1452
*e-mail: puntium@
Abstract - This paper proposes a new ballast that is ignitor by the LC resonance and shows the better electrical-
ignited by internal LC resonance of buck converter. In to-lumen efficacy than low-frequency square wave
order to cancel the steady state current ripple, the operation. However, it is not easy to avoid the acoustic
proposed ballast utilizes the coupled inductor filter which resonance due to the variable frequency control and the
minimizes the size and weight of the ballast. The widely located acoustic resonance frequency in tens and
operation mode of the proposed ballast is analyzed and hundreds kHz.
the performance of the new ballast is verified by the
experimental results from a 150W prototype ballast for
metal halide discharge (MHD) lamp. S S
HS 1 HS 3
Drive Drive
I. INTRODUCTION
PFC
L
Among the various kinds of high intensity discharge 1
(HID) lamps, MHD lamps are considered to be one of the
C1 C2
most effective light sources since MHD lamps have high
LS S LS S4
electrical-to-lumen efficacy, long life, good color rendition , Drive 2 Dr