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摘要
In this paper, a dual-capacitor-inductor-transformer (CLT) (D-CLT) soft-switching dc-dc converter has been proposed. Combining the multiresonant technology, the converter employs two high-frequency transformers in the resonant tank and exhibits desirable characteristics. The fundamental and the third-order harmonics can be utilized to transfer active power simultaneously. The share of third harmonic is larger than first component. Thus, the converter can use the 100-kHz controlling signals to mainly transfer the 300-kHz active power, which makes it easier to realize high power density. Moreover, the available range for the third power delivery is expanded as well. A resonant zero point is introduced into the voltage gain curves. It ensures broadened voltage gain range (from zero to the maximum) and good protection for overcurrent issue. Then, improved soft-switching performances have been achieved: All the switches achieve the zerovoltage- switching (ZVS) turn-ON, whereas all the diodes obtain the zero-current-switching (ZCS) turn-ON and quasi-ZCS turn-OFF. Switching losses are constrained to the minimum. To verify the feasibility of the proposed converter, a 330-W prototype is established and tested. The results demonstrate the experiments match well with the theoretical analyses. The peak efficiency has reached 95.2%, although a high-loss diode bridge is adopted.
- 出版日期2019-5
- 单位国网电力科学研究院; 天津大学
