This paper proposes interleaved buck converters with a single-capacitor snubber to smooth out switch turn-off transition. The single-capacitor snubber is used to limit rising rate of drain-source voltage of the metal-oxide-semiconductor field-effect transistor (MOSFET) switch in the converters to reduce turn-off loss. In addition, the converters are operated at the boundary of continuous and discontinuous conduction modes (CCM), (DCM) to reduce turn-on loss, and in an interleaving ...

This paper presents an active-clamp push–pull converter for battery sourcing applications. A pair of auxiliary switches, resonant inductors, and clamping capacitors is added to the primary side of the transformer to clamp voltage spike and recycle the energy trapped in the leakage inductors. In the proposed active-clamp push–pull converter, since both main and auxiliary switches can be turned on with zero-voltage switching, switching loss can be reduced and conversion efficiency ...

This paper presents an interleaved soft-switching buck converter with coupled inductors to extend duty ratio for high step-down voltage applications. In the proposed converter, a single-capacitor turn-off snubber is introduced to limit rising rate of active switches to reduce turn-off loss. To handle the energy trapped in the leakage inductance of the coupled inductors, simple passive-clamp circuits are added to the proposed converter, which can effectively recycle the energy and ...

In this paper a modified-forward multi-input converter (MFMIC) for renewable energy is proposed, which can not only process solar energy but deal with wind power. The proposed converter is derived from series forward structure to step down voltage for charger systems or dc distribution applications. The MFMIC mainly contains an upper forward, a lower forward, a common output inductor, and a DSP-based system controller. The upper and lower forwards can operate separately or simultaneously ...

This paper proposes a photovoltaic (PV) power system for battery charger applications. The charger uses an interleaving boost converter with a single-capacitor turn-off snubber to reduce voltage stresses of active switches at turn-off transition. Therefore, active switches of the charger can be operated with zero-voltage transition (ZVT) to decrease switching losses and increase conversion efficiency. In order to draw the maximum power from PV arrays and obtain the optimal power control ...

This paper presents an active-clamp push-pull converter for battery sourcing applications. A pair of auxiliary switches, resonant inductors and clamping capacitors are added to the primary-side of the transformer to clamp voltage spike and recycle the energy trapped in the leakage: inductors. In the proposed active-clamp push-pull converter, since both main and auxiliary switches can be turned on with zero-voltage switching, switching loss can be reduced and conversion efficiency ...

In this paper, a high step-up DC/DC converter is proposed, which can boost low PV panel voltage or battery voltage to a high level so as to power the dc side of grid-connected PV inverter. The proposed converter is composed of an inductor, a power switch, and a coupled inductor and is derived from the integration of buck-boost and flyback for high voltage-gain achievement. Even though it possesses buck-boost and flyback features, there is no the problem of reverse voltage polarity and ...

In this paper, a reflex charger with zero-voltage-switching (ZVS) and non-dissipative cells for photovoltaic (PV) energy conversion is presented. The proposed reflex charger has the following advantages: (1) A ZVS cell is incorporated to reduce the switching losses of the main and auxiliary switches. Therefore, the conversion efficiency of the proposed reflex charger can be improved significantly; (2) A non-dissipative charging/discharging reflex cell is used to increase charging ...

This paper presents a coupled-buck converter with active-clamp circuits. The active switches in the converter can sustain a long enough duty cycle while it operates with a high step-down voltage ratio, reducing current stress significantly. In the converter, the active-clamp circuits provided can have benefits of recycling the leakage energy, while minimum ringing voltage is across the active switches. Moreover, since both main and auxiliary switches can be turned on with zero-voltage ...

In this paper, a power supply system for hybrid renewable energy conversion is proposed, which can process PV (photovoltaic) power and wind-turbine energy simultaneously for step-down voltage and high current applications. It is a dual-input converter and mainly contains a PV energy source, a wind turbine energy source, a zero-voltage-switching (ZVS) forward converter, and a current-doubler rectifier. The proposed power supply system has the following advantages: (1) PV-arrays and ...

In this paper, an interleaved zero-voltage switching (ZVS) coupled-inductors buck converter with active-clamp circuits is study. Compared with passive-clamp circuits, the active-clamp circuits in the interleaved buck converter provided can have benefits of recycling the leakage energy, while minimum ringing voltage is across the active switches. Moreover, since both main and auxiliary switches can be turned on with ZVS, switching loss can be reduced and conversion efficiency therefore ...

A PV power-generation system with a phase-shift pulse-width modulation (PWM) technique for high step-up voltage applications is proposed. The proposed power-generation system consists of two stages. In the input stage, all power switches of the full-bridge converter with phase-shift technique can be operated with zero-current switching (ZCS) at turn-on or turn-off transition. Hence, the switching losses of the power switches can be reduced. Then, in the DC output stage, a voltage-doubler ...

In this paper, a coupled-inductor Sepic-type power factor corrector (PFC) with soft-switching is proposed to drive high brightness LED panel. The two inductors in the Sepic-type PFC are magnetically coupled to lower volume. A soft-switching cell composed of an active switch, a resonant inductor and a resonant capacitor is embedded into the PFC to obtain zero-voltage switching (ZVS) feature so as to promote converter efficiency. The proposed PFC is suitable for universal-line input 85Vac ...

In this paper, an active-clamp forward converter with a current-doubler circuit for photovoltaic (PV) energy conversion is proposed. The proposed converter consists of a PV arrays energy source, a active-clamp forward converter, and a current-doubler circuit. It has the following advantages: 1) maximum power point tracking (MPPT) can be accomplished for PV arrays energy, 2) zero-voltage-switching (ZVS) for active switches of forward converter is implemented to reduce switching and ...

This paper presents a current-doubler rectifier with low output current ripple and high step-down voltage ratio. In the proposed rectifier, two extra inductors are introduced to extend the duty ratio of the switches, which in turn reduces the peak current through the isolation transformer as well as the output current ripple; two extra diodes are used to provide discharge paths for the two extra inductors. To highlight the merits of the proposed rectifier, its performance indexes, such ...