In this paper, we propose a high step-up resonant dc-dc converter with ripple-free input current for renewable energy systems. We use an input-current doubler and switching mechanism employed at output-voltage to achieve voltage gain without having transformer turns ratio. An active-clamp circuit installed on the primary side suppresses surge switch components recycles stored in leakage inductance. A resonance that occurs secondary of is used reduce turn-off loss significantly, power...

In this paper, a quasi-resonant forward-flyback converter is proposed for photovoltaic power system. Since the output of connected in series, circuit offers high-step up conversion. The forward that consists transformer leakage inductance and resonant capacitor generates almost sinusoidal currents during switch on-time so primary switching stress has been significantly reduced. flyback transfers energy stored magnetizing to load off-time. Design guidelines parameters are presented. To verify...

This article proposes a highly efficient current-fed half-bridge resonant converter over wide range of the output voltages. By adding bidirectional switch across center nodes voltage doubler and applying corresponding switching modulation, accomplishes almost zero-voltage at turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> instant under variations. Moreover, circuit experiences very little instantaneous reactive current even when...

This article presents a reactive power elimination method for high conversion-ratio bidirectional resonant converter with ripple-free current at the low voltage side. When transferring in backward mode operation, heavy loads suffers from significant reverse that generates power. By adjusting right amount of phase pulsewidth modulation signals, we can eliminate and corresponding We derive gain, calculate phase, identify load threshold, above which appears. use 600 W prototype to demonstrate...

This article proposes a bridgeless push–pull resonant ac–dc converter featuring naturally balanced switching loss at the primary side. The proposed employs current-fed structure and two rectifier diodes side series resonance circuit secondary By incorporating diodes, diode bridge can be removed from grid of converter, thereby that number components primary-side conduction are reduced. One major advantage is distribution over one cycle voltage, which guarantees high power transfer capability...

This paper introduces the bridgeless triple-mode resonant ac-dc converter and presents its dynamic model control technique. The proposed operates in triple mode: discontinuous-conduction mode (DCM), continuous-conduction (CCM), missing resonance (MRM). It has advantages of small number required components, medium power capacity, high efficiency, but it is difficult to because DCM, CCM, MRM have their own characteristics. To solve this problem, boundaries are first identified and,...

This article presents a dual-mode resonant flyback single power-conversion inverter with reduced number of power components. Unlike conventional converters, it transfers in manner during the first half switching period and linear way remaining period. It operates above resonance mode below computed instantaneous level, this level. The secondary diodes converter are merged into two secondary-side switches proposed configuration, which reduces active-power operation principle is presented...

This paper presents design and control of the coupled inductor based multi-phase buck converter for magnet power supply. Using structure inter-leaved operation, we were able to reduce output current ripples significantly. The inductors each two phases are adopted number cores ripples. circuit operates in continuous conduction mode, so it experiences less can achieve higher efficiency than discontinuous mode. effects parasitic components considered improve model accuracy dynamic performance....

A high step up converter having rippleless input current is proposed for a fuel-cell power conditioning system. The consists of double current-fed half-bridge circuit at the primary side and bridgeless rectifier with series-resonant secondary side. Interleaving scheme fixed 0.5 duty-cycle operation primary-side make ripple become zero. step-up capability can be achieved by switching operation. steady-state analyzed. 600-W prototype was built used to validate performance converter.

This paper presents an instantaneous reactive power reduction method for rippleless resonant bidirectional converter in backward operation. The is applied to improve existing topology that features high step-up/down capability, efficiency and zero input ripple. original suffers from significant reverse current when transferring backwards under synchronous rectification. By adding a single switch the circuit, we are able block operation, which dramatically reduces circulating stress on...

This article presents bidirectional operation of a resonant converter that features high step-up/down capability, efficiency, and balanced capacitor voltage. When transferring power in the backward direction, original may suffer from significant reverse current due to large fluctuation By applying right amount phase pulsewidth-modulation signal, we can remove instantaneous reactive generated during operation. We first derive nominal duty ratio secondary side terms voltage gain, then...

This paper presents a resonant flyback photovoltaic microinverter with reduced number of power components. Unlike conventional converter, it transfers energy in manner during the first half switching period and linear way remaining period. It operates dual-mode: below resonance mode (BRM) above computed instantaneous level (ARM) this level. Secondary diodes converter are integrated into two secondary-side switches proposed inverter configuration, which reduces active-power The operation...

This paper presents a single power-conversion AC-DC converter with noncomplementary active-clamp circuit that can achieve high power conversion efficiency. We adopted the modulation strategy to suppress voltage spike of main switch and minimize losses caused by turn-off switching current circulating current. To 1-kW capacity, we used series resonant which provides zero-current output diodes. Moreover, it has benefit bidirectional core excitation, thereby this transfers energy in linear way...

In this paper, we present an instantaneous reverse current elimination method for a capacitor voltage balanced bidirectional resonant converter operating in the backward operation. A conventional high step-up with may suffer from significant due to large fluctuation of By adding single switch circuit, are able block operation, which dramatically reduces and stress on switch. non-complementary modulation strategy is developed further reduce conduction loss, comes use As result, proposed has...

This article proposes a dual-path series-resonant single-stage dc–ac converter operating in hybrid mode. The proposed circuit provides dual power transfer paths regardless of the switching state; secondary diodes are integrated into one two complementary pairs secondary-side switches, thereby contributing to reduced complexity and cost. operates below resonance mode (BRM) above computed instantaneous level (ARM) this level. During BRM, it can achieve step-up function with high conversion...