Reducing the high frequency transformer losses in an FB ZVT PWM converter

Yun, Chun-Gi; Kim, B.-C.; Kim, K.-H.; Lim, Young‐Cheol; Freere, Peter

doi:10.1049/ip-epa:20020134

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…However, ZVS full-bridge converters have two major disadvantages: 1) a relatively large circulating current during the freewheeling interval results in power losses in the device and the transformer [5], 2) the dead time of the chopping leg switches is much higher than that of the lagging leg switches resulting in duty ratio loss [6]. To overcome the problem of the ZVS converter, a zero-voltage transition(ZVT) full-bridge converter is developed [7,8], however the circuit is complexity since it requires two auxiliary switches and an additional resonant inductor [9,10].…”

Section: Introductionmentioning

confidence: 99%

Full-Bridge DC-DC Converter Using Asymmetric Phase-Shifted PWM Control

Tao¹,

Zhang²,

Xiguo³

2015

TOAUTOCJ

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A novel zero-voltage and zero-current switching (ZVZCS) Full-bridge converter is proposed using Asymmetric Phase-shifted PWM Control, Current in primary winding during the freewheeling period is reduced to zero by adding a blocking capacitor and a saturable inductor, realizing ZCS turn-on and ZVS turn-off for chopping-leg switches as well as ZCS turn-on and turn-off for lagging-leg switches. The control method is easy digital realization, overcomes control precision and flexibility of the traditional phase-shifting control special chip. The operation processes and characteristics of the converter are analyzed, and a prototype is built. Experimental results verify the proposed DC-DC converter with low freewheeling energy, low switching loss and high efficiency.

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Section: Introductionmentioning

confidence: 99%

Full-Bridge DC-DC Converter Using Asymmetric Phase-Shifted PWM Control

Tao¹,

Zhang²,

Xiguo³

2015

TOAUTOCJ

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“…Therefore, the magnetizing inductance should be maximized in order to reduce this circulating current. Alternatively, a method of reducing this current such as using a split primary winding [24] or additional switches and switching intervals [25] could be employed. However, both of these methods required additional switches or magnetic components which will increase the physical dimensions of the converter and component cost.…”

Section: Introductionmentioning

confidence: 99%

Analytical calculation of resonant inductance for zero voltage switching in phase‐shifted full‐bridge converters

Hallworth

Potter

Shirsavar

2013

IET Power Electronics

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The phase shift full bridge (PSFB) converter allows high efficiency power conversion at high frequencies through zero voltage switching (ZVS); the parasitic drain-to-source capacitance of the MOSFET is discharged by a resonant inductance before the switch is gated resulting in near zero turn-on switching losses. Typically, an extra inductance is added to the leakage inductance of a transformer to form the resonant inductance necessary to charge and discharge the parasitic capacitances of the PSFB converter. However, many PSFB models do not consider the effects of the magnetizing inductance or dead-time in selecting the resonant inductance required to achieve ZVS. The choice of resonant inductance is crucial to the ZVS operation of the PSFB converter. Incorrectly sized resonant inductance will not achieve ZVS or will limit the load regulation ability of the converter. This paper presents a unique and accurate equation for calculating the resonant inductance required to achieve ZVS over a wide load range incorporating the effects of the magnetizing inductance and dead-time. The derived equations are validated against PSPICE simulations of a PSFB converter and extensive hardware experimentations.

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