Proceedings ArticleDOI

# 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

AbstractThe 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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Journal ArticleDOI
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.

10 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
More filters
Book
31 Jul 1997
TL;DR: Converters in Equilibrium, Steady-State Equivalent Circuit Modeling, Losses, and Efficiency, and Power and Harmonics in Nonsinusoidal Systems.
Abstract: Preface. 1. Introduction. I: Converters in Equilibrium. 2. Principles of Steady State Converter Analysis. 3. Steady-State Equivalent Circuit Modeling, Losses, and Efficiency. 4. Switch Realization. 5. The Discontinuous Conduction Mode. 6. Converter Circuits. II: Converter Dynamics and Control. 7. AC Equivalent Circuit Modeling. 8. Converter Transfer Functions. 9. Controller Design. 10. Input Filter Design. 11. AC and DC Equivalent Circuit Modeling of the Discontinuous Conduction Mode. 12. Current Programmed Control. III: Magnetics. 13. Basic Magnetics Theory. 14. Inductor Design. 15. Transformer Design. IV: Modern Rectifiers and Power System Harmonics. 16. Power and Harmonics in Nonsinusoidal Systems. 17. Line-Commutated Rectifiers. 18. Pulse-Width Modulated Rectifiers. V: Resonant Converters. 19. Resonant Conversion. 20. Soft Switching. Appendices: A. RMS Values of Commonly-Observed Converter Waveforms. B. Simulation of Converters. C. Middlebrook's Extra Element Theorem. D. Magnetics Design Tables. Index.

5,939 citations

Journal ArticleDOI
29 Jun 1992
Abstract: A class of zero voltage transition (ZVT) power converters is proposed in which both the transistor and the rectifier operate with zero voltage switching and are subjected to minimum voltage and current stresses. The boost ZVT-PWM converter is used as an example to illustrate the operation of these converters. A 300 kHz, 600 W ZVT-PWM boost, DC-DC converter, and a 100 kHz, 600 W power factor correction circuit using the ZVT-PWM technique and an insulated gate bipolar transistor (IGBT) device were breadboarded to show the operation of the proposed converters. It is shown that the circuit technology greatly improves the converter performance in terms of efficiency, switching noise, and circuit reliability. >

882 citations

Proceedings ArticleDOI
J.A. Sabate
11 Mar 1990
Abstract: A steady-state analysis is presented with complete characterization of the converter operation. A small-signal model of the converter is established. The design procedures based on the analysis are presented and the various losses in the circuit assessed. Critical design considerations for a high-power, high-voltage application are analyzed. The results of the analysis are verified using a high-voltage. 2 kW prototype. >

847 citations

### "DC gain loss model and optimal choi..." refers background or methods in this paper

• ...Loss analysis for this converter is presented in [6]....

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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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• ...For ZVS operation from 10 % of the load, required (Llk) is designed [6]....

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• ...Small signal model for PMC is presented in [1, 6, 8, 11], which is used for the feedback control implementation....

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• ...Design guidelines for ideal PMC is presented in [6]....

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Journal ArticleDOI
V. Vlatkovic
Abstract: The specific circuit effects in the phase-shifted PWM (PS-PWM) converter and their impact on the converter dynamics are analyzed. The small-signal model is derived incorporating the effects of phase-shift control and the utilization of transformer leakage inductance and power FET junction capacitances to achieve zero-voltage resonant switching. The differences in the dynamic characteristics of the PS-PWM converter and its PWM counterpart are explained. Model predictions are confirmed by experimental measurements. >

215 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....

[...]

Journal ArticleDOI