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A high efficiency, low profile, and high step-up dc-dc converter is proposed for low dc voltage renewable energy systems. The proposed converter employs an active-clamp technique with the complementary pulse width modulation (PWM) controller. Multiple transformers can be employed for a low profile design as well as multiple resonant rectifiers for the soft-switching operation of the output rectifying...
This paper presents a hybrid switching scheme for LLC series-resonant half-bridge (SRHB) dc-dc converter. The concept of the proposed hybrid switching scheme is changing the switching mode to improve power efficiency in a wide load range. The SRHB converter operates in three different switching modes depending on the output load condition. Digital control of the system facilitates the implementation...
This paper proposes a new bridgeless single-stage half-bridge ac-dc converter. The proposed converter integrates the operation of the bridgeless power factor correction (PFC) boost rectifier and the asymmetrical pulse-width modulation (APWM) half-bridge dc-dc converter. The proposed converter provides high power factor and direct power conversion from the line voltage to an isolated dc output voltage...
This paper presents a high-efficiency grid-connected photovoltaic (PV) module integrated converter (MIC) system. The proposed PV MIC system consists of a high step-up dc-dc converter and a single-phase full-bridge dc-ac inverter. A flyback dc-dc converter with a high step-up ratio is proposed to convert the low PV module voltage into a high dc-link voltage. The full-bridge inverter performs the maximum...
The usual way to avoid a computer shutdown during a mains failure is to connect an ac uninterruptible power supply (UPS). Alternatively, in this paper, a simple and high efficiency dc UPS is presented by proposing an isolated bidirectional soft-switching dc-dc converter. The bidirectional dc-dc converter operates under zero-current switching (ZCS) condition by utilizing the leakage inductor of the...
A high efficiency photovoltaic (PV) module integrated converter (MIC) system is proposed. The proposed system consists of a high step-up DC-DC converter and a single-phase full-bridge inverter. The proposed step-up DC-DC converter has a high efficiency and low-profile. An input ripple current reduction control is suggested to reduce the low frequency ripple current generated by the full-bridge inverter...
A new high efficiency high step-up dc-dc converter is proposed for photovoltaic (PV) module integrated converter (MIC) systems. In the proposed converter, two transformers are utilized to double the voltage conversion ratio. Two resonant voltage doubler rectifiers are designed so that the output rectifying diodes are turned off at zero-current. A 260 W prototype was built and tested. Power efficiency...
A step-up dc-dc converter with a resonant voltage doubler is proposed. The proposed converter is composed of an active-clamp circuit and a resonant voltage doubler. The active-clamp circuit, which is controlled by dual asymmetrical pulsewidth modulation of the primary side, reduces the voltage spikes of main switches and limits the voltage stress of the switches as the maximum input voltage. In addition,...
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