Article

Circuit Properties of Zero-Voltage-Transition PWM Converters

Journal of power electronics (Impact Factor: 0.75). 01/2008; 8(1).

ABSTRACT A zero-voltage-transition (ZVT) pulse width modulated (PWM) converter is a PWM converter with a single main power switch that has an auxiliary circuit to help it turn on with zero-voltage switching (ZVS). There have been many ZVT-PWM converters proposed in the literature as they are the most popular type of ZVS-PWM converters. In this paper, the properties and characteristics of several types of ZVT-PWM converters are reviewed. A new type of ZVT-PWM converter is then introduced, and the operation of a sample converter of this type is explained and analyzed in detail. A procedure for the design of the converter is presented and demonstrated experimentally. The feasibility of the new converter is confirmed with results obtained from an experimental prototype. Conclusions on the performance of ZVT-PWM converters in general are made based on the efficiency results obtained from the experimental prototypes of various ZVT-PWM converters of different types.

0 Followers
 · 
122 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, design and control is proposed for a four input-series-output-series-connected 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 250-kW PV power conditioning system (PCS). This system has only three DC/DC converters with a 25-kW power rating and uses only one-third of the total PV PCS power. The 25-kW 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.
  • [Show abstract] [Hide abstract]
    ABSTRACT: In spite of having many advantages such as low switch voltage and easy implementation, the voltage-fed DC-DC converter has been suffering from problems associated with large transformer leakage inductance due to high transformer turn ratio when it is applied to low voltage high current step-up application such as fuel cells. This paper proposes a new three-phase voltage-fed DC-DC converter which is suitable for low voltage high current applications. The required transformer turn ratio is as low as that of the current-fed converter owing to Delta-Y connection. 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 reduces the circulating current flowing through the high current 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.
    Power Electronics Specialists Conference, 2008. PESC 2008. IEEE; 07/2008
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, a 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. Based on the analysis, in the proposed topology, only 30.7% power of the total PV system is needed for a dc/dc converter. Furthermore, the dc/dc converter efficiency curve is flat under wide PV module voltage and all load ranges. In particular, the converter efficiency at the lower duty range is dramatically improved. The total PV system is implemented for a 250-kW PV power conditioning system (PCS). This system has only three dc/dc converters with a 25-kW power rating. It is only one-third of the total PV PCS power. The 25-kW prototype PV dc/dc converter is introduced to experimentally verify the proposed topology. In addition, an experimental result shows that the proposed topology exhibits a good performance.
    IEEE Transactions on Industrial Electronics 08/2008; 55(7-55):2655 - 2663. DOI:10.1109/TIE.2008.924165 · 6.50 Impact Factor
Show more

Preview

Download
4 Downloads
Available from