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Author: search.filters.author.Kishan, D.Subject: search.filters.subject.Resonant converters

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    Dual Output Symmetrical Voltage Cancellation Controlled Full Bridge Resonant LED Driver
    (Institute of Electrical and Electronics Engineers Inc., 2023) Ponduru, R.R.; Kishan, D.; Ahmad, M.W.
    This paper proposes a simultaneous controlled dual output full-bridge converter for LED lighting systems. Two LED lamps are powered using a full-bridge. The devices in full-bridge converter are switched at zero voltage using LC resonant circuit. Therefore, switching transition power losses are minimized which increases the LED driver efficiency. An inductor is connected in series with each LED lamp to reduce ripple current. Thus, the use of electrolytic capacitor can be eliminated. This feature increases lifespan of proposed resonant LED driver. Symmetrical Voltage Cancellation control is designed for both regulation and dimming operation. Numerical simulations are carried out to validate the performance of the proposed LED converter circuit configuration. © 2023 IEEE.
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    An Integrated EV Battery Charger With Three-Level Boost PFC Converter and H5-Bridge Based Bidirectional DO-CLL Series Resonant Converter for Wide Battery Voltage Range
    (Institute of Electrical and Electronics Engineers Inc., 2025) Vinusha, B.; Kalpana, R.; Kishan, D.
    This article proposes an efficient two-stage ac–dc converter for off-board electric vehicle charging applications over a wide range of battery voltages. The proposed charger integrates a three-phase three-level boost power factor correction (TL-BPFC) converter with a bidirectional dual-output CLL (DO-CLL) series resonant converter. In the ac–dc conversion stage, three switches are controlled using a hysteresis technique to enhance input power quality. The second stage, responsible for dc–dc conversion, incorporates an H5-bridge on the primary side and a voltage doubler circuit on the secondary side, providing decoupled outputs through two high-frequency transformers (HFTs) connected to resonant tanks. This configuration allows flexible adjustment of the resonant tank inputs, which can operate in full-bridge (FB), half-bridge (HB), or inactive (IA) modes. This design provides a key advantage of a wide voltage range during forward and reverse operation using reconfigurable H5 bridge. Additionally, the switches in the DO-CLL achieve zero-voltage switching (ZVS) during turn-on, and the identical HFTs minimize the cross-coupling effect, to enhance the efficiency. A scaled-down laboratory prototype of the off-board EV charger is developed to provide two distinct outputs of 400 V and 200 V, achieving an overall efficiency of 97.6%. © 1982-2012 IEEE.