Abstract
In future dc distributed power systems, high performance high voltage dc-dc converters with redundancy ability are welcome. However, most existing high voltage dc-dc converters do not have redundancy ability. To solve this problem, a wide load range zero-voltage switching (ZVS) three-level (TL) dc-dc converter is proposed, which has some definitely good features. The primary switches have reduced voltage stress, which is only Vin/2. Moreover, no extra clamping component is needed, which results simple primary structure. Redundancy ability can be obtained by both primary and secondary sides, which means high system reliability. With proper designing of magnetizing inductance, all primary switches can obtain ZVS down to 0 output current, and in addition, the added conduction loss can be neglected. TL voltage waveform before the output inductor is obtained, which leads small volume of the output filter. Four secondary MOSFETs can be switched in zero-current switching (ZCS) condition over wide load range. Finally, both the primary and secondary power stages are modular architecture, which permits realizing any given system specifications by low voltage, standardized power modules. The operation principle, soft switching characteristics are presented in this paper, and the experimental results from a 1 kW prototype are also provided to validate the proposed converter.
Highlights
The dc distribution, with several good features, e.g., high system stability, high conversion and transmission efficiency, high flexibility and easy system control [1,2,3], seems to be the most attractive solution for future power systems with the increasing percentage of renewable energy sources, such as photovoltaic, wind power, and fuel cells
High voltage dynamic transition would cause some electrical-magnetic compliable (EMC) problems, which is not preferred in the designing and producing procedure of the high input dc-dc power converters
The Lm should out that Im is irrelevant to the load current and increased with input voltage, there is still enough observestored following energy in theequation leakage inductance to ensure zero-voltage switching (ZVS) for all primary switches under no loads or high input condition
Summary
The dc distribution, with several good features, e.g., high system stability, high conversion and transmission efficiency, high flexibility and easy system control [1,2,3], seems to be the most attractive solution for future power systems with the increasing percentage of renewable energy sources, such as photovoltaic, wind power, and fuel cells. Dc-dc converters for high voltage dc distributions with good input and output characteristics, simple and compact circuit structure, good efficiency performance have already become hot issues in the power electronics society [4]. Many other good research results have been reported [8,9,10], wide range soft switching technologies and converters with reduced volume of the in following main aspects: new topologies for [6,10,11,12,13,14,15,16], special applications [8,9,10], wide range soft switching input and output filters [16,17,18,19].
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