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Nowadays, the white goods consumer market is very aggressive concerning energy saving, reliability and cost. In microwave ovens applications one of the most delicate part is the magnetron, in particular during start up. Usually, in Microwave oven using inverter, an expensive and complicated circuit is required, especially for proper start up. This paper proposes a novel start up control strategy for...
A high-efficiency photovoltaic (PV) micro-inverter consisting of two power stages i.e. a LLC resonant converter with a new hybrid control scheme and a dc-ac inverter is proposed, studied and designed in this paper. In the first power stage, the new hybrid control combining pulse-frequency modulation (PFM) and phase-shift pulse-width modulation (PS-PWM) is employed on a full-bridge LLC dc-dc converter,...
Performance of a current-fed bidirectional LLC resonant converter for energy storage system in DC grid applications is analyzed and tested. The well match of the voltages on two sides of the LLC circuit is ensured by varying the duty cycle of buck-boost circuit under wide battery voltage range. Hence LLC circuit is operated like a DC transformer to improve efficiency. In the battery discharging mode,...
Based on the respective merits of the LLC resonant converter and the VI (Variable Inductor), a new battery charger topology is proposed. This paper presents a design methodology for the LLC resonant converter controlled with a VI. The output of the converter is regulated through a variable resonant tank in order to control the charging process. A small-scale prototype fed by a 50V DC input, with an...
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