Article
Circuit Properties of ZeroVoltageTransition PWM Converters
Journal of power electronics (Impact Factor: 0.75). 01/2008; 8(1).

Article: A ThreePhase ZeroVoltage and ZeroCurrent Switching DC–DC Converter for Fuel Cell Applications
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ABSTRACT: In spite of having many advantages, such as low switch voltage and easy implementation, the voltagefed dcdc converter has been suffering from problems associated with large transformer leakage inductance due to high transformer turn ratio when it is applied to lowvoltage, highcurrent stepup application such as fuel cells. This paper proposes a new threephase voltagefed dcdc converter, which is suitable for lowvoltage, highcurrent applications. The transformer turn ratio is reduced to half owing to ??Y connection. The zerovoltage and zerocurrent switching (ZVZCS) for all switches are achieved over wide load range without affecting effective duty cycle. A clamp circuit not only clamps the surge voltage but also reduces the circulation current flowing in the highcurrent side, resulting in significantly reduced conduction losses. The duty cycle loss can also be compensated by operation of the clamp switch. Experimental waveforms from a 1.5 kW prototype are provided.IEEE Transactions on Power Electronics 03/2010; · 5.73 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: This paper proposes an inputseriesoutputparallel connected ZVS full bridge converter with interleaved control for photovoltaic power conditioning systems (PV PCS). The inputseries connection enables a fully modular powersystem architecture, where low voltage and standard power modules can be connected in any combination at the input and/or at the output, to realize any given specifications. Further, the inputseries connection enables the use of lowvoltage MOSFETs that are optimized for a very low RDSON, thus, resulting in lower conduction losses. The system costs decrease due to the reduced current, and the volumes of the output filters due to the interleaving technique. A topology for a photovoltaic (PV) dc/dc converter that can dramatically reduce the power rating and increase the efficiency of a PV system by analyzing the PV module characteristics is proposed. The control scheme, consisting of an output voltage loop, a current loop and input voltage balancing loops, is proposed to achieve input voltage sharing and output current sharing. The total PV system is implemented for a 10kW PV power conditioning system (PCS). This system has a dc/dc converter with a 3.6kW power rating. It is only onethird of the total PV PCS power. A 3.6kW prototype PV dc/dc converter is introduced to experimentally verify the proposed topology. In addition, experimental results show that the proposed topology exhibits good performance.Journal of power electronics 01/2010; 10(1). · 0.75 Impact Factor  [Show abstract] [Hide abstract]
ABSTRACT: In this paper, design and control is proposed for a four inputseriesoutputseriesconnected ZVS full bridge converter for the photovoltaic power conditioning system (PCS). The novel topology for a photovoltaic (PV) DC/DC converter that can dramatically reduce the power rating and increase the efficiency of a PV system by analyzing PV module characteristics is proposed. The control scheme, including an input voltage controller is proposed to achieve equal sharing of the input voltage as well output voltages by a four series connected module. Design methods for ZVS power stage are also introduced. The total PV system is implemented for a 250kW PV power conditioning system (PCS). This system has only three DC/DC converters with a 25kW power rating and uses only onethird of the total PV PCS power. The 25kW prototype PV DC/DC converter is introduced to verify experimentally the proposed topology. In addition, an experimental result shows that the proposed topology exhibits good performance.
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