CLL resonant converters with output short-circuit protection

Gould, C and Bingham, Chris and Foster, M P and Stone , D A (2005) CLL resonant converters with output short-circuit protection. Institute of Electrical Engineers Electric Power Applications, 152 (5). pp. 1296-1306. ISSN 0885-8993

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CLL resonant converters with output short-circuit protection
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Official URL: http://dx.doi.org/10.1049/ip-epa:20045157

Abstract

Abstract: The use of harmonic excitation of resonant converters as a means of limiting excessive electrical stresses on power switches, and tank components, in the event of over-current or output short-circuit fault conditions is investigated. It is demonstrated that the excitation of the primary tank resonance, by odd harmonics of the square-wave input voltage, facilitates reduced power dissipation for systems that are subject to long periods of standby operation. Due to the inherent limitations of traditional fundamental mode approximation techniques to predict sub-harmonic
resonant peaks, an alternative, steady-state, cyclic-averaging methodology, is proposed, that is shown to provide accurate and rapid analysis of the resonances when the converter is operated under short-circuit conditions, thereby allowing the effects of high electrical components stresses to
be mitigated, and eliminates the necessity for time-consuming integration-based simulations. Measurements from a prototype converter, along with simulation results from a derived statevariable model and a component-based simulation package, are used to demonstrate the accuracy
of the proposed cyclic predictions, and the reduction in losses imparted by the use of harmonic excitation when compared to other previously published techniques for over-current/short-circuit protection.

Item Type:Article
Additional Information:Abstract: The use of harmonic excitation of resonant converters as a means of limiting excessive electrical stresses on power switches, and tank components, in the event of over-current or output short-circuit fault conditions is investigated. It is demonstrated that the excitation of the primary tank resonance, by odd harmonics of the square-wave input voltage, facilitates reduced power dissipation for systems that are subject to long periods of standby operation. Due to the inherent limitations of traditional fundamental mode approximation techniques to predict sub-harmonic resonant peaks, an alternative, steady-state, cyclic-averaging methodology, is proposed, that is shown to provide accurate and rapid analysis of the resonances when the converter is operated under short-circuit conditions, thereby allowing the effects of high electrical components stresses to be mitigated, and eliminates the necessity for time-consuming integration-based simulations. Measurements from a prototype converter, along with simulation results from a derived statevariable model and a component-based simulation package, are used to demonstrate the accuracy of the proposed cyclic predictions, and the reduction in losses imparted by the use of harmonic excitation when compared to other previously published techniques for over-current/short-circuit protection.
Keywords:Resonant power conversion
Subjects:H Engineering > H600 Electronic and Electrical Engineering
Divisions:College of Science > School of Engineering
ID Code:2329
Deposited By:INVALID USER
Deposited On:22 Apr 2010 17:30
Last Modified:13 Mar 2013 08:36

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