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HYSTERETIC POWER FACTOR CONTROL METHOD FOR SINGLE STAGE POWER CONVERTERS
HYSTERETIC POWER FACTOR CONTROL METHOD FOR SINGLE STAGE POWER CONVERTERS
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机译:单级功率变换器的迟滞功率因数控制方法
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摘要
Embodiments described herein describe a switching power converter that includes a transformer, a switch, and a controller that generates a control signal to turn on and turn off the switch. For each alternating current (AC) half-cycle of an input voltage, the controller determines a minimum value of a signal representing an on-time of the power converter, compares the determined minimum value with a threshold value that is used to determine whether the switching power converter operates in a constant on-time mode or in a constant power mode, and adjusts the threshold value based on a result of the comparison. The controller further generates the control signal to operate the switching power converter in a constant power mode during a first time period of the AC half-cycle, the first time period representing a duration where the threshold value is larger than an instantaneous value of the first signal.
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