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Download as PDFHigh-efficiency Resonant dc/dc Converter Utilizing a Resistance Compression Network
This project presents a new topology for a high-efficiency dc/dc resonant power converter that utilizes a resistance compression network[1],[2]. Unfortunately, while many soft-switched resonant designs achieve excellent performance for nominal operating conditions, performance can degrade quickly with variation in input and output voltages and power levels. The proposed topology seeks to overcome this challenge.
Experimental results from a 200 W prototype operating at 500 kHz show that high efficiency is maintained over a wide input voltage, output voltage and power range. As shown in Fig. 2 over 95% efficiency is maintained across an input voltage range of 25 V to 40 V with an output voltage of 400 V. These experimental results demonstrate the effectiveness of the proposed design.
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- Figure 1: Topology of the proposed resistance compression network converter.
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- Figure 2: Measured efficiency and output power versus input voltage variation (with output voltage at 400V).
- Y. Han, O. Leitermann, D. A. Jackson, J. M. Rivas, and D. J. Perreault, “Resistance Compression Networks for Radio-Frequency Power Conversion,” IEEE Transactions on Power Electronics, Vol. 22, No.1, pp. 41-53, Jan. 2007. ) to provide simultaneous zero voltage switching and near-zero current switching across a wide range of input and output voltages and power levels. The resistance compression network maintains desired current waveforms over a wide range of voltage operating conditions. The use of on/off control in conjunction with narrowband frequency control enables high efficiency to be maintained across a wide range of power levels. The converter implementation provides galvanic isolation and enables large (greater than 1:10) voltage conversion ratios, making the system suitable for large step-up conversion in applications such as distributed photovoltaic converters.
Soft-switched resonant converter topologies providing zero-voltage switching (ZVS) or zero-current switching (ZCS) can greatly reduce loss at the switching transitions, enabling high efficiency at high frequencies ((R. L. Steigerwald, “High-Frequency Resonant Transistor DC-DC Converters,” IEEE Transactions on Industrial Electronics, vol. IE-31, no. 2, pp. 181-191, May 1984. [↩]
- R. L. Steigerwald, “A Comparison of Half-Bridge Resonant Converter Topologies,” IEEE Transactions on Power Electronics, vol. 3, no. 2, pp. 174-182, Apr. 1988. [↩]