دانلود رایگان مقاله A Phase-Shift-Controlled Direct AC-to-AC Converter for Induction Heaters
IEEE Transactions on Power Electronics, 2017
A Phase-Shift-Controlled Direct AC-to-AC Converter for Induction Heaters
This paper proposes a new control method of a direct ac-to-ac converter consisting of two half-bridge converters and a series-resonant circuit. This circuit converts the ac input power from the utility grid to a high-frequency ac output without any dc stage. This circuit does not require a diode bridge rectifier, and thus, makes it possible to reduce forward voltage drops and power losses in the diodes. A new switching sequence for phase-shift control is proposed to regulate the capacitor voltage in each half-bridge converter and to achieve both zero-voltage switching and synchronous rectification. The proposed phaseshift control is theoretically discussed and is also verified by experimental setup using super-junction power MOSFETs. As a result, the proposed direct ac-to-ac converter exhibits a good power conversion efficiency as high as 97.7% at the rated power
of 1.3 kW.
Index Terms—Direct ac-to-ac conversion, High-frequency inverters, Phase-shift control, Synchronous rectification, Zerovoltage switching.
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