Current reconstruction strategy for DCM boost PFC converter
For parasitics-induced current distortion(PCD)effect in discontinuous conduction mode boost power factor correction(PFC)converter,with consideration of parasitics,an accurate damped inductor current equation was derived through the functions of input voltage,output voltage and duty cycle.PCD effect was found to have considerable influence to current distortion,which degraded PF under SACM control.In order to reduce the PCD effect,a compensation gain was derived to reshape the input current.The gain was calculated at different conditions.A current reconstruction strategy was proposed for sensor-less average current mode(SACM)control.Based on the damped current equations,a compensation gain was derived to reconstruct the input current,which reduces the current damping and distortion caused by parasitics.It is proved to have little change along load resistance.Both the PCD phenomenon and the current reconstruction strategy are verified by simulations and experiments.
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