High-power conditioning for space applications
Article Abstract:
Spacecraft power systems are responsible for the efficient conversion of available solar, chemical, or nuclear energy into electrical power for thermal, altitude control, payload, and housekeeping systems. Such systems require substantial power conditioning. The power systems are typically in one of three types: regulated, sunlight regulated, or unregulated bus voltage. Power distribution to demands are either decentralized DC-DC or centralized DC-AC distribution. The three types of active power-conditioning elements are at the interface of the source and the demand, although not in each type of power system: the unregulated bus only uses active power distribution, the sunlight regulated bus uses solar array conditioning and battery discharge, and the regulated bus uses all three. Modes of control and state-of-the-art power systems are also discussed.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1988
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High-frequency quasi-resonant converter technologies
Article Abstract:
Quasi-resonant converters (QRCs) are a new family of megahertz-range, high-density power processing systems derived from pulse-width-modulation (PWM) converters whose switches have been replaced by new resonant switching techniques. These techniques, zero-current switching (ZCS) and zero-voltage switching (ZVS) use LC resonant circuits to create zero-current or zero-voltage switching conditions to reduce switching losses, stresses, and noise. ZCS-QRCs can operate in the 1-2MHz switching range, and such convertors have been implemented with power densities to 25W-inE3. ZVS-QRCs have been built with switching frequencies exceeding 10MHz. The theory, technology, and comparative advantages and disadvantages of ZVS-QCRs and ZCS-QCRs are discussed. Examples of power states, gate drives, and single- and double-loop feedback controls are described.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1988
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