Abstract
This paper presents design, fabrication, and performance evaluation of a high voltage power supply
for Carbon Nano Tube-based planar light sources. The proposed power supply employs an LLC
resonant half-bridge converter and a sixfold voltage-multiplying rectifier. Steady-state characteristics
of the voltage-multiplying rectifier are analyzed and used to derive the input-to-output voltage
conversion ratio of the power supply. The input-to-output frequency response characteristics of the
LLC tank circuit are analyzed and utilized in designing a proto-type power supply which produces a 15
KV output using a 400 V input source. The high-voltage transformer is fabricated using a sectional
bobbin structure with an epoxy impregnation, in order to provide sufficient insulation for high voltage
operations. The performance of the proposed power supply is confirmed with stable and reliable
operations at the 15 KV output from no load to nominal load conditions. The proposed power supply is
well suited as an electric ballast required stable operations of Carbon Nano Tube-based planar light
sources.
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