A Wide Load Range ZVS Dual Half-Bridge Converters for Large-Sized PDP Sustaining Power Modules

High-efficiency dual half-bridge converters are analyzed to achieve a zero voltage switching (ZVS) with a wide load range for a large sized plasma display panel (PDP) sustaining power module. The circuit consists of the dual half-bridge configuration in a primary side, two voltage doublers rectifiers in a secondary side, and the ZVS tank. The ZVS operation of the primary switches can be obtained with the ZVS tank irrespective of a load condition. In addition, although the proposed converter does not have the output inductive filter, a root mean square (RMS) current stress of the output capacitor can be reduced by the complementary operation. An experimental prototype of 900 W power converter is constructed and tested to verify the features of the proposed converter. As a result, the proposed sustaining power circuit can achieve more than 92% of high efficiency at 10% load condition and the ZVS operation is achieved at the light load condition.