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Session 2793

Dynamic analysis of a series resonant inverter with bidirectional switches in a half-wave operation

A. Shenkman, Senior Member IEEE, B. Axelrod Holon Academic Institute of Technology, Israel

Abstract. In this paper the simple circuit of a series resonant inverter is analyzed. This is usually presented in textbooks and is given as an example to explain the principle of the operation of such inverters. However the simplifications usually made by its analysis are far away from the real conditions of operation. More precise analysis of this circuit shows that from a practical point of view this circuit is not operable. Examples of improving this circuit to make it operable are given.

1. Introduction In section 11-2.2 of Rashids’ text-book1 a short analysis of a series resonant inverter (Fig.1) is given. This analysis examines an ideal case, i.e. the ideal switches, an ideal inductance and an ideal capacitance. In addition, which is even more important, the examined circuit does not include any load. In this ideal case it is quite correct that the output frequency fo is the same as the resonant frequency f r: ωr f0 = fr = 2π

It is then obvious, that the positive current half-wave (via thyristor T1) and the negative current half-wave (via diodeD1), (Fig. 1) are symmetrical. Furthermore, at the instant when the negative half-wave current is finished, the capacitor voltage reaches a zero level (Fig. 2). This fact is illustrated in the numerical example 1.

"Proceedings of the 2003 American Society for Engineering Education Annual Conference & Exposition Copyright ? 2003, American Society for Engineering Education"

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Axelrod, B. (2003, June), Dynamic Analysis Of A Series Resonant Inverter With Bidirectional Switches In A Half Wave Operation Paper presented at 2003 Annual Conference, Nashville, Tennessee. 10.18260/1-2--11425