A Study of T-Type and ZVS-PWM Full-Bridge Converters for Switch-Mode Power Supplies

Khodabakhsh, Javad; Moschopoulos, Gerry

doi:10.1109/tpel.2019.2956431

Cited by 8 publications

(9 citation statements)

References 32 publications

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“…The converter switches are operating with ZVS if I 3 and I 4 have the same sign. More details about the operation of the ZVS T-Type converter operation can be found in [17].…”

Section: A Zvs T-type Convertermentioning

confidence: 99%

“…The converter delivers the nominal voltage with D = 0.6, where D is related to the time span from t 1 to t 2 . The transformer turns ratio (n) is selected in the same manner as in [17]. The voltage divider capacitors and output filter are designed in the same manner as in [17] and [27], respectively.…”

Section: Zvzcs T-type Converter Designmentioning

confidence: 99%

“…The transformer turns ratio (n) is selected in the same manner as in [17]. The voltage divider capacitors and output filter are designed in the same manner as in [17] and [27], respectively. The auxiliary circuit components are designed with the same method as in [24].…”

Section: Zvzcs T-type Converter Designmentioning

confidence: 99%

“…The performance of this converter was compared by the authors of this paper to that of the ZVS-PWM-FB converter in [17]. It was demonstrated in [17] that, unlike ZVS-PWM-FB converters, the voltage across the switches in ZVS T-type converters is half of the input voltage before they are switched on; thus, when the converter operates under light load conditions and switches lose their ZVS capability, a T-Type converter has lower switching losses than a ZVS-PWM-FB. In many applications, light-load efficiency is important as the converter operates under light-load conditions for most of the time and under heavy-load conditions occasionally.…”

mentioning

confidence: 99%

“…It should be noted that the novelty of this paper is not so much with the way ZVZCS is implemented in a T-type converter as many ZVZCS methods have been proposed for the standard full-bridge converter in the literature and a commonly-used method has been selected for this paper. The main contribution of this paper is the use of ZVZCS as a way to improve light-load efficiency and reduce current stresses in the middle-leg switches in a T-type converter, to improve upon the work that the authors presented in [25]. The addition of ZVZCS to a T-type converter results in characteristics that have not been reported in the literature.…”

mentioning

confidence: 99%

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A T-Type DC-DC Converter With Reduced Middle-Leg Switch Current Stress and Improved Light-Load Efficiency

Khodabakhsh¹,

Moschopoulos

2020

IEEE Open J. Power Electron.

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The ZVS T-type converter can be used as an alternative to the conventional ZVS-PWM full-bridge (FB) converter for applications where improved light-load operation is required. In this converter, two of the switches conduct only the current that flows during a freewheeling mode of operation and two of the switches conduct only the current that flows in the converter when it is in an energy-transfer mode. This is unlike the switches in the ZVS-PWM-FB converter that must conduct both currents. Although the ZVS T-type converter needs less inductive energy to achieve ZVS in its switches, it has a higher primary current during its freewheeling modes than the ZVS-PWM-FB converter because it is basically a half-bridge converter. In this paper, the use of ZVZCS methods to reduce the RMS value of the current in switches that are used in the freewheeling current path is investigated. The operation of the ZVS-PWM T-type converter and a T-type converter operating with ZVZCS are reviewed and compared analytically. Experimental results obtained from prototypes of the two converters along with results from prototypes of the standard ZVS-PWM-FB converter and a ZVZCS-PWM-FB converter are presented. It is demonstrated that a T-type converter with ZVZCS has a better light-load efficiency than the ZVS-PWM-FB and the ZVS T-type converters and that the current stress in its middle-leg switches is much smaller; thus, it can be implemented with much smaller and inexpensive middle-leg switches. INDEX TERMS DC-DC power conversion, Zero voltage switching (ZVS), Zero-voltage-zero-current switching (ZVZCS), ZVS T-Type converter.

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“…The converter switches are operating with ZVS if I 3 and I 4 have the same sign. More details about the operation of the ZVS T-Type converter operation can be found in [17].…”

Section: A Zvs T-type Convertermentioning

confidence: 99%