A high-density 1 kW resonant power converter with a transient boost function

• Published in: IEEE transactions on power electronics Vol. 8; no. 4; pp. 431 - 438
• Main Authors: Steigerwald, R.L., Roshen, W., Saj, C.F.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.10.1993; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Boosting; DC-DC power converters; Electrical engineering. Electrical power engineering; Exact sciences and technology; Flexible electronics; Inductors; Power electronics, power supplies; Resonance; RLC circuits; Steady-state; Switches; Switching circuits; Voltage fluctuations; Waveform; Operation study; Reduction; Electric scheme; Direct current convertor; Static convertor; Compact design; Joule effect loss; Resonance; Electrical characteristic
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/63.261013

A series/parallel resonant DC-DC converter with secondary-side resonance and a novel input boosting feature is described. In order to greatly reduce the conduction loss (factor of four) due to circulating currents in the resonant components, the boost circuit, which requires no additional active switches, operates only when needed during transient input voltage dips. This reduces the effective input voltage range over which the converter must operate and allows optimization at the steady-state input voltage. The converter employs highly efficient resonant inductors and novel Z-folded thin flex circuit transformer windings to meet a density of greater than 50 W/in/sup 3/ with an efficiency approaching 95%. The DC-DC converter was developed for use as a 270 to 50 V line converter for distributed power applications.< >