DC gain loss model and optimal choice of switching frequency and turns ratio for high gain, high power, phase modulated resonant transition converters
01 Dec 2016-pp 1-6
TL;DR: In this paper, the authors proposed a DC gain loss model for phase modulated full bridge resonant transition converters and analyzed the six intervals of operation of the converter with non-ideal parameters like winding resistance of the output filter inductor, on-state resistance of MOSFETs, resistance (R diode ) and forward voltage drop (V D ) of output rectifier diodes.
Abstract: The phase modulated full bridge resonant transition converters are widely used for high gain, high power applications. For such applications, the difference in the output voltage predicted from the lossless DC gain model and the actual output voltage is significant. Hence the DC gain loss model for this converters is proposed and analyzed in this paper. The six intervals of operation of the converter are analyzed with non-ideal parameters like winding resistance (R L ) of the output filter inductor, on-state resistance (R on ) of MOSFETs, resistance (R diode ) and forward voltage drop (V D ) of output rectifier diodes. The DC gain loss model is derived from the analysis of these intervals. The optimal choice of turns ratio and switching frequency based on the proposed DC gain loss mode is presented. The proposed DC gain loss model is validated in the simulations. The experimental prototype for 250 W is implemented, verifying the model and design presented in this paper.
Citations
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TL;DR: In this article, a phase modulated full bridge resonant transition converter (PMRTC) is used for high-gain, high-power applications, as PMRTC converters retain the qualitative nature of hard switched pulse-width modulation counterparts with additional damping, where $R_d$ is load, transformer turns ratio and frequency dependent.
Abstract: The phase modulated full bridge resonant transition converter (PMRTC) is commonly used for high-gain, high-power applications, as PMRTC converters retain the qualitative nature of hard switched pulse-width modulation counterparts with additional damping ( $R_d$ ), where $R_d$ is load, transformer turns ratio and frequency dependent. The PMRTC converter enables operation at a higher switching frequency due to the soft-switching nature, thereby achieving better power density. For battery fed high-power, high-gain applications, PMRTC exhibits a significant drop in the dc gain due to $R_d$ and other nonidealities, limiting the maximum frequency of operation. Thus, computing this drop and analyzing the effects of switching frequency becomes necessary in achieving the required steady-state dc gain. From the analysis, it is observed that, for a choice of switching frequency above $f_{s\;{\rm critical}}$ , the required steady-state dc gain is not achieved for any turns ratio. Hence, to increase the switching frequency of operation of a PMRTC converter, a two-transformer configuration is adapted and with this configuration, the dc gain loss model, power loss, and efficiency model and small-signal model are established. The design guidelines on the choice of switching frequency and transformer turns ratio based on the proposed models is described. The proposed models with the presented design guidelines are validated in simulations and hardware prototype for a 1 kW PMRTC converter.
14 citations
Cites methods from "DC gain loss model and optimal choi..."
...The dc gain loss model is proposed and analyzed for PMRTC [22] considering the nonideal parameters along with the virtual (damping) resistance Rd (representation of the duty loss)....
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References
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Proceedings Article•
01 Jan 2004TL;DR: In this paper, the authors present the general design guideline of the isolated DC-DC converter used in green power applications, which is based on the analysis of the circuit and stability characteristic of the controlled and uncontrolled rectifier.
Abstract: This paper presents the general design guideline of the isolated DC-DC converter used in green power applications. At the beginning of the paper, the circuit candidates are compared with each other, and one optimized circuit topology is proposed based on the circuit and stability characteristic analysis of the controlled and uncontrolled rectifier. The operating modes, peak current and power transfer ability of the selected circuits are fully analyzed. The design guideline of the DC-DC converter is presented based on the analysis. The experimental results of a 5 kW DC-DC converter in fuel cell inverter system are shown to support the analysis and illustrations. The simulation result of a proposed circuit is also shown to support all the analysis.
20 citations
15 Aug 2000
TL;DR: In this paper, the small-signal model of a current mode control full-bridge phase-shifted ZVS PWM converter is derived based on the small signal model of the converter.
Abstract: In this paper, the small-signal model of a current mode control full-bridge phase-shifted ZVS PWM converter is derived based on the small-signal model of the converter. Through the transformation of the current mode small-signal model into the respective transfer function model, a simplified close loop current mode small-signal transfer function of the converter is obtained. By using the derived small-signal model, it is possible to design the compensation network of the converter in the frequency domain.
18 citations
"DC gain loss model and optimal choi..." refers methods in this paper
...Small signal model for PMC is presented in [1, 6, 8, 11], which is used for the feedback control implementation....
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06 Jul 2011
TL;DR: The impact of transformer's leakage inductance and the value of output inductor on the transformer's input current and transfer power and MATLAB simulation results are shown to support the analysis.
Abstract: Isolated dc-dc converter is widely used in power system, especially in green power applications. Compared with the other circuits, full bridge converter is more suitable for power system, where high power and high voltage are involved. This paper proposes the full bridge converter with the uncontrolled rectifier. Three different operating modes and characteristics are analysed. Besides, this paper studies the impact of transformer's leakage inductance and the value of output inductor on the transformer's input current and transfer power. MATLAB simulation results are also shown to support the analysis.
16 citations
"DC gain loss model and optimal choi..." refers background in this paper
...Analysis of the PMC in continuous, border mode and discontinuous conduction modes are presented in [2, 4, 9]....
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Journal Article•
TL;DR: In this article, a phase-modulated full-bridge converter (PMC) is presented, with a power density of nearly 5 W/inch3 (0.3 W/cm3 ).
Abstract: Hlgh power densities can be achieved in switched-mode power supplies, by switching at very high frequencies. The resonant transition converters have many desirable features at such high frequencies. One such converter, namely, the phase-modulated full-bridge converter (PMC) is presented in this paper. The basic principles of operation are briefly discussed. The various trade-offs involved in the design are explained. Experimental and simulation results. obtained on a 560 W/250 kHz PMC, with a power density of nearly 5 W/inch3 (0.3 W/cm3 ) are presented.
12 citations
"DC gain loss model and optimal choi..." refers background or methods in this paper
...It has the advantages of both resonant converters and PWM converters [5]....
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...Pole-Pole voltage (vab) and transformer primary current (iac) waveforms of a PMC converter [5, 6] are shown in Fig....
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