Faculty Publications

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    Analysis and Design of a High-Frequency Isolated Full-Bridge ZVT CLL Resonant DC-DC Converter
    (Institute of Electrical and Electronics Engineers Inc., 2019) Patil, U.; Nagendrappa, N.
    In this paper, a new pulsewidth modulated gating scheme and a zero-voltage transition (ZVT) auxiliary circuit is proposed for a fixed frequency full-bridge CLL dc-dc resonant converter with a capacitive output filter. An approximate complex ac circuit approach is used for the steady-state analysis of the converter. The optimum design of the converter is described with the help of design curves for a sample converter of 200-W power rating operating at a switching frequency of 100 kHz. The converter with applied gating scheme and ZVT auxiliary circuit provides zero-voltage switching to all the switches for the entire variations in loading and input voltage conditions ensuring higher conversion efficiency. PSIM simulations are carried out to verify theoretical predictions about the performance of the converter for various operating conditions. Finally, experimental results are provided to verify the feasibility of the proposed converter. The theoretical, simulation, and experimental results are given and discussed. © 1972-2012 IEEE.
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    Performance evaluation of high-frequency CLL resonant DC–DC converter operated with phase-shift and modified PWM gating scheme: Analysis, design and implementation
    (Institution of Engineering and Technology, 2020) Patil, U.; Nagendrappa, N.
    Normal phase-shift and modified pulse-width modulation gating schemes are proposed for a full bridge high-frequency capacitor–inductor–inductor (CLL) resonant DC–DC converter, and its performance is analysed in this study. Detailed modelling and the steady-state analysis of the converter are performed by using the fundamental harmonic approximation approach. Various modes of the converter operation with both the gating schemes are described and examined in detail. Zero-voltage switching of all the main switches is achieved by designing the resonant converter to operate in the above resonance mode. The optimum design of the converter is illustrated with the help of a flowchart and design curves. PSIM simulation is carried out and the experimental prototype is built to substantiate theoretical performance predictions. The simulation and experimental results are presented and compared. © The Institution of Engineering and Technology 2020
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    Comparison of Phase-Shift and Modified Gating Schemes on Working of DC-DC LCL-T Resonant Power Converter
    (Institute of Electrical and Electronics Engineers Inc., 2021) Reddy, V.B.; Nagendrappa, H.
    This brief discusses the operation and performance comparison of LCL-T DC-DC resonant power converter when controlled with fixed-frequency phase-shifted gating (PSG) and modified-gating signals (MGS) schemes. The converter is designed to operate in lagging power factor mode to accomplish zero-voltage switching (ZVS) of the inverter switches. The operating principle of the converter with the two proposed gating schemes is explained. A brief steady-state analysis of the converter using Fourier series approach is presented. The choice between PSG and MGS schemes is made by comparing the performance of the converter. It is found that both the gating schemes are effective in regulating the output voltage for variable input voltage and loading conditions. However, the efficiency of the converter is found to be higher with MGS due to the fact that only one switch loses ZVS as compared to two with the PSG when operated with maximum input voltage. Also, the variation in pulse-width angle (?) required to regulate the output voltage is small in MGS as compared to that with PSG. A 300 W experimental prototype of the converter has been built and tested to verify the theoretical results. It is experimentally confirmed that the MGS control gives the better performance than the PSG control for different input voltage and loading conditions. © 2004-2012 IEEE.
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    Design and Development of Modular Dual-Input DC-DC Step-Up Converter for Telecom Power Supply
    (Institute of Electrical and Electronics Engineers Inc., 2021) Kiran, R.; Kalpana, R.
    A modified modular dual-input dc-dc step-up converter along with a battery charging/discharging bidirectional converter that is suitable for telecom load applications is proposed in this article. The proposed converter has two individual input modules with the three-leg semiactive rectifier connected in parallel at secondary side for achieving constant voltage across the load with reduced circulating power. This results in an advantage of having compact structure with reduced number of components. The proposed converter works under a zero-voltage switching condition, it has favorable advantage such as low switching losses and high efficiency of the system. The complete design and steady-state analysis of the proposed converter utilizing field programmable gate array (FPGA)-based digital control strategy have been investigated in this article. A scaled down laboratory prototype of 1 kW has been developed and the robustness of the proposed converter is validated by extensive test results under variable input voltage and load conditions. © 1972-2012 IEEE.