The paper deals with design analysis and synthesis of the storage elements of LCTLC power resonant inverter with sinusoidal output voltage. The filter used for creating it has to remove higher harmonic components from the supplying voltage to reach the harmonic distortion roughly 5% in the whole range of the load (0-100%). Non-symmetrical control is used for voltage to be constant. Right choosing and design of LC storage components is important from the point of view voltage and current stresses, overvoltages and requested THD values. Design procedure of them is demonstrated and confirmed by computer simulation.
DESIGN APPROACH FOR LCLC ELEMENTS OF A RESONANT CONVERTER
The paper focuses on the analysis and synthesis of storage elements of an LCTLC power resonant converter with harmonic output voltage. Such a filter must not pass higher harmonic components of the supply voltage so that the harmonic distortion is less than
5% in the entire load range (0-100%). Asymmetrical control is used to achieve constant output voltage. The correct selection and design of LC storage elements is important in terms of voltage and current stress, overvoltages, and achieving the required harmonic distortion. The paper demonstrates the design procedure and confirms it with computer simulation.
1. INTRODUCTION
There are many applications where the load has to be supplied from an HF transformer with stiff harmonic voltage due to synchronization, constant frequency, and precise phase control. It can be provided by different types of converters.
One of the novel types of converters are LCLCL converters based on the LLC resonant scheme, and the LCTLC inverter [1], [2], [3] consists of a DC/DC buck converter, an LCLC resonant filter, and an HF transformer. The HF transformer can also be connected after the
LCLC filter, if necessary. (…)
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Source: Logistyka Magazine
Design procedure for lctlc converter – PDF file for download