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DC-DC power converters including a valley skipping mode and methods of operating DC-DC power converters
DC-DC power converters including a valley skipping mode and methods of operating DC-DC power converters
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机译:包括谷值跳跃模式的DC-DC功率转换器以及操作DC-DC功率转换器的方法
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摘要
A DC-DC power converter includes an input, an output, a transformer, and a primary FET coupled to selectively conduct current though a primary winding of the transformer. The primary FET includes a drain that experiences multiple resonant voltage valleys during each dead-time period of the converter. The converter further includes a synchronous rectifier coupled to selectively conduct current through a secondary winding of the transformer, and a control circuit. The control circuit is configured to operate the primary FET in a valley skipping mode by turning on the primary FET during a second or subsequent one of the multiple resonant voltage valleys, and to allow a negative current in the secondary winding of the transformer before turning off the synchronous rectifier during one or more of the multiple resonant voltage valleys. Methods of operating DC-DC power converters are also disclosed.
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