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TIME-LIMITING MODE (TLM) FOR AN INTERLEAVED POWER FACTOR CORRECTION (PFC) CONVERTER
TIME-LIMITING MODE (TLM) FOR AN INTERLEAVED POWER FACTOR CORRECTION (PFC) CONVERTER
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机译:交错式功率因数校正(PFC)转换器的时限模式(TLM)
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摘要
The present invention provides a method of controlling an interleaved power factor correction (PFC) circuit operating in a discontinuous conduction mode (DCM). The controller employs a normal mode of operation in which inductor currents in each PFC sub-circuit are estimated based on the monitored input voltage and monitored output voltage, and switching devices associated with each PFC sub-circuit are controlled to ensure DCM operation. As the input voltage increases, the OFF times of each PFC sub-circuit increase such that the inductor currents no longer overlap. In response, the controller activates a time-limiting mode (TLM) in which OFF time durations for each sub-circuit are based on the monitored sum of load currents as opposed to the monitored input voltage and monitored output voltage.
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