Power Control in Series-Resonant Bridge Inverters

Karadzinov, Ljupco and Stefanov, Goce (2017) Power Control in Series-Resonant Bridge Inverters. In: IEEE EUROCON 2017, 6-7 July 2017, Ohrid, Macedonia.

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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. In these applications, to control the power level it is common to use the above resonance operating frequency, where only measurement of the deviation of the phase angle from its reference value is used to calculate the new bridge switching frequency. Below resonance is not used since its control is non-linear, has high level of harmonics and is considered unstable, so no detailed analysis have been carried out. The paper present mathematical analysis of the output power, voltage and current phase angle dependence on the resonant circuit damping frequency when it is excited with pulse voltage with a different frequency than the resonant one, in both above and below resonance regions. Based on this analysis, possibilities of below resonance power control are investigated and new insight in circuit behavior is presented based on variation in resonant tank parameter values.

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: 01 Nov 2017 13:43
Last Modified: 01 Nov 2017 13:43
URI: http://eprints.ugd.edu.mk/id/eprint/18387

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