Analysis of resonant inverter with parametric maintenance of load power
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 79, Issue 3
Abstract
High-frequency voltage resonant inverters traditionally realize the functions of load voltage or current control and stabilization. But there is a wide application area which needs to stabilize a load power rather then its voltage or current. The problems of power parametric maintenance in variable load by means of voltage resonant inverters are considered in this paper. In order to reduce a load power variation, the approach to forming of inverter load power response by the way of equal distributing of load power positive and negative deviations from nominal value is proposed. Such distribution of load power deviations is achieved by corresponding choice of the parameters of inverter oscillatory tank. In case of load resistance change from minimum to maximum value, the curve of inverter output power as a function of quality factor of oscillatory tank starts at a point of minimum power, then it reaches a point of nominal power, next, a point of maximum power and, at last, a point of finish power. In accordance with proposed approach, the finish power is equal to the start (minimum) power, and the maximum positive power deviation is equal to the maximum negative power deviation. Analysis consists in establishing of analytical expressions which describe the connections between minimum and maximum powers in variable load and corresponding values of oscillatory tank quality factor. On the basis of these expressions the equations which connect this power relative deviations and parameters of resonant inverter are obtained. To ensure a small switching loss in resonant inverter, the inverter parameters are calculated taking into account the zero-voltage switching condition. The design sequence for calculation of each oscillatory tank parameters is proposed. Proposed design sequence is based on a numerical solution of two equations set relative to oscillatory tank parameters and inverter power supply dc voltage. It is shown that resonant inverter designed as open loop circuit is able to achieve the power deviations about of 4% for a double change in load resistance. To verify obtained results the electrical circuit of resonant inverter with above calculated parameters was simulated using MicroCap 9.0. Simulations results demonstrate good agreements with theoretical ones.
Authors and Affiliations
Anatoliy Lupenko, Mykhailo Palamar
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