The authors describe the operation, characteristics and design of a two-loop control technique for a MHz-switching series–parallel resonant converter. A resonant current feedback loop is used to determine the transistor switching instants resulting in the fourth-order converter characteristics becoming third order and, furthermore, being insensitive to operating conditions. The technique exploits the inherent delays in MHz-switching converter systems to provide well-damped dynamics. An output voltage control loop bandwidth of 100 kHz is achieved.
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http://iet.metastore.ingenta.com/content/journals/10.1049/ip-epa_19970943
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