This paper proposes a high efficiency dc-dc converter with high step-up gain for low PV voltage sources. The proposed converter converts the low dc voltage to a high dc voltage with a high-efficiency. The proposed converter uses the active-clamping circuit and voltage-doubler rectifier in order to achieve a high step-up ratio and soft-switching operation. The output diodes are turned off at zero-current, which can significantly reduce the switching power losses at high output voltage applications. The performance of the proposed converter is evaluated on a 260 W photovoltaic module integrated converter (PV-MIC) system. A high-efficiency of 97.5 % is achieved to generate 350V high output voltage from 36 V low PV module voltage.
This paper proposes a high efficiency power conversion system for battery-ultracapacitor hybrid energy storages. The proposed system has only one bidirectional dc-dc converter for hybrid power source with batteries and ultracapacitors. The hybrid power source has bidirectional switching circuits for selecting one energy storage device. Bidirectional power flow between the energy storage device and high voltage capacitor can be controlled by one bidirectional converter. An asymmetrical switching method is applied to the bidirectional converter for high power efficiency. Switching power losses are reduced by zero-voltage switching of power switches. System operation and design considerations are presented. The experimental results are provided to verify the performance of the proposed system.
This paper proposes a bridgeless half-bridge AC-DC converter with high-efficiency. The proposed converter integrates the bridgeless power factor correction (PFC) circuit with the asymmetrical pulse-width modulated (APWM) half-bridge DC-DC converter. It provides the isolated DC output voltage from the AC line voltage without using any full-bridge diode rectifier. Conduction losses are lowered with a simple circuit structure. Switching losses are also reduced by achieving zero-voltage switching (ZVS) of the power switches. By using series-connected two transformers, the proposed converter provides a low-profile and high power density for AC-DC converters. The performance of the proposed converter is verified from a 250 W (48 V / 5.2 A) experimental prototype circuit at 90 V rms line voltage.
This paper presents a high efficiency step-up DC-DC converter for low-DC renewable energy sources. The proposed DC-DC converter is controlled by asymmetrical pulse width modulation(APWM) technique and achieves Zero-current switching(ZCS) of all output diodes. Compared to the previous DC-DC converters, the voltage stresses of the semiconductor devices can be reduced in the proposed converter. Experimental results are obtained from a 200 W output power. The proposed DC-DC converter achieves a high efficiency of 97.5 % at the rated load. Index Terms-DC-DC converter, soft-switching, high voltage gain, zero-current switching(ZCS).
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