Direct Phase Digital Control Method in Power Inverters Based on Dumping Frequency Analysis

Karadzinov, Ljupco and Stefanov, Goce (2015) Direct Phase Digital Control Method in Power Inverters Based on Dumping Frequency Analysis. In: Eurocon 2015, 6-8 Sept 2015, Salamanca, Spain.

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Abstract

Direct phase or indirect frequency control methods are used in series-resonant bridge power inverters for induction heating to maintain maximum power transfer as the load equivalent electrical parameters change during the heating process. The paper present mathematical analysis of the output voltage and current phase angle dependence on the resonant circuit dumping frequency when it is excited with pulse voltage with a different frequency than the resonant one. Based on this analysis and using only measurements of the deviation of the phase angle from its reference value, an improved control method is derived that calculates the new bridge switching frequency. An algorithm for digital implementation is presented. The improved method is verified by simulations and experiments on a prototype.

Item Type: Conference or Workshop Item (Paper)
Subjects: Engineering and Technology > Electrical engineering, electronic engineering, information engineering
Divisions: Faculty of Electrical Engineering
Depositing User: Goce Stefanov
Date Deposited: 16 Sep 2015 14:19
Last Modified: 16 Sep 2015 14:19
URI: http://eprints.ugd.edu.mk/id/eprint/13804

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