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This paper presents the study of a singlestage, single-phase, unity power factor converter, isolated by a high frequency transformer, based on a Zeta converter operating in discontinuous conduction mode (DCM). The main feature of the proposed converter is its ability to naturally emulate an apparent resistance to the ac input source, without current sensor or current controller. Circuit operation,...
A new high-power-factor rectifier with high-frequency isolation is presented in this paper. The proposed topology presents intrinsic ZVS commutation allowing the operation with high-switching frequency. It also presents the multiphase operation reducing the input inductance and input current ripple. The structure is a bridgeless rectifier, reducing the number of semiconductors in conduction, presenting...
This paper presents an AC-DC Cuk converter based on Three-State Switching Cell (3SSC). The main features of this converter are: reduced conduction losses on the controlled switches, magnetic components operating with the double of switching frequency, reducing weight and volume, reduced high-frequency output current ripple. A simple control strategy that can be implemented with well know integrated...
This paper presents a three-phase unidirectional rectifier power-factor correction (PFC) using two modified single-phase Buck rectifiers in continuous conduction mode (CCM). The phase reduction technique using an autotransformer based on Scott Connection renders a non-isolated rectifier to operate with unity power factor. The power autotransformer is only 14% of the total output power. Two single-phase...
This paper presents a fault tolerant converter designed for low power applications, as required in a micro-grid environment. The main advantages of this converter when compared with solutions presented in the technical literature are: 1) higher number of levels using the same amount of controlled switching devices (six IGBTs), b) no dead-time requirement for the converter's operation, which is an...
In this paper, a new non-insulated DC-DC converter called Double Quadratic Buck Converter is proposed. This new converter has the advantages of high gain ratio near half range of duty cycle compared to the conventional Buck Converter. The stress voltage over the switches is reduced to half of the value compared to the conventional Quadratic Buck Converter. The topological symmetry simplifies the theoretical...
This paper presents a Quadratic Boost converter associated to a passive lossless snubber to achieve soft-switching purpose without an extra switch and additional control circuit. The proposed converter has a high voltage gain, low switching losses and reduced electromagnetic interference (EMI). It will be presented operation stages, main waveforms, phase planes, static gain equation, graphics of duty...
This paper proposes demonstrate an alternative method of DC-DC converter integration to generate high step-up DC/DC converters. The methodology is based on integration of the common circuits of the standard DC/DC converters and association of the converters output sections. It is presented that for the integration of two non-isolated converters, the output sections can only be series connected, meanwhile...
This paper presents a dc-dc boost converter with high voltage gain based on three-state switching cell for split-capacitor neutral-point clamped inverters. The proposed converter is analyzed considering the operation in continuous conduction mode and duty cycle higher than 0.5, which corresponds to overlapping mode. The main characteristics of the topology are: operation at high switching frequency,...
The recent development of dual-stage photovoltaic micro-inverters motivates the study of DC-DC converter topologies with high-gain capabilities. Following this idea, a comparison of both static and dynamic performances of the known quadratic boost converter topologies is tackled in this paper. To achieve an accurate comparison, we use the same electronic components and the same control scheme. Considering...
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