Design and Validation of High Gain Z-Source Fed LCL- T Resonant Charger for Constant Current Application

High voltage/power supplies found their applications in generation of high-power laser, flash X-Rays and plasma generation. Capacitor charging power supplies are primarily using to charge high density capacitors, wherein all its energy discharges for very short duration of time across highly dynamic loads. In such power supplies the primary boosting element is high gain step up transformer. The breakdown, coupling capacitance and leakage inductances are the key parameters in design. These lead to unreliable operation and makes design complicated. To overcome this and to improve reliability an attempt has been made to analyze and integrating high gain DC-DC converters with resonant converters for constant current applications. In this paper proposes a charging scheme for constant current application, through interfacing of lossless high gain DC-DC converter with LCL- T resonant immittance converter. An analytical approach used to model Z source network for different PWM techniques cascaded with 3
^rd
order resonant converter circuit. The resonant converter and high frequency inverter are operated at same frequency to derive constant current and soft switching. Simulation has been carried out in MATLAB simulink software and results demonstrated to validate mathematical results. The results are close in agreement with mathematical results.