Analysis of oscillatory tanks of resonant inverner in power source mode
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 78, Issue 2
Abstract
The problems of power maintenance in variable load by means of voltage resonant inverters with various serial-parallel resonant tanks by the way of corresponding selection of its parameters is considered. A comparative analysis of three basic series-parallel oscillatory tanks of resonant inverter is accomplished. The inverter load is connected in parallel to the capacitance section of oscillatory tank and in series with inductance to half-bridge switching section. These resonant tanks are the next: 1) the tank with load connected in parallel to the first capacitor through the second capacitor;2) the tank with load connected in parallel to the first capacitor directly and through the second capacitor to the tank inductance; 3) the tank which topology corresponds to both above appointed tanks but differs from them by infinity capacitance of second capacitor. Analysis consists in establishing of analytical expressions which describe the connections between minimum and maximum power in variable load and corresponding values of oscillatory tank quality factor. On the basis of these expressions the equations for power relative deviations and parameters of resonant inverter are obtained. The dependency of power maintenance error vs. load resistance range is established. It is appointed that in case of equality of power for minimum and maximum loads, the maximum power deviation from given power in load range will reach its minimum value. It is showed that all considered tanks have practically equal possibilities in power maintenance but the first tank has highest efficiency and it is a best choice among these tanks. For all tanks the next assertion is established: the square of the quality factor which corresponds to the maximum load power level is equal to the multiplication of two quality factors which correspond to some less load power level. To ensure a small switching loss in resonant inverter, the parameters of oscillatory tanks are calculated taking into account the zero-voltage switching condition. Therefore the inverter resonant frequency which reaches its maximum value at maximum load resistance mustn’t exceeds the inverter switching frequency. The design sequence for calculation of each oscillatory tank parameters is proposed. This design sequence is based on a numerical solution of two equations set relative to tank parameters and parameter of inverter dc voltage. Calculated inductance, first and second capacitances, dc voltage of the inverter and its switching frequency ensure minimum value of maximum power deviation in given load resistance range. Calculated dependence of maximum deviation of relative power as a function of ratio of a maximum load resistance to its minimum value and the dependence of load power vs. load resistance verify the obtained results. It is shown that resonant inverter designed as open loop circuit is able to achieve the power deviations about of 6% of its nominal value for a double change in load resistance.
Authors and Affiliations
Anatoliy Lupenko
Keywords
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