Increase power factor by digitally compensating PFC EMI-capacitor reactive curre
نویسنده
چکیده
Introduction Many articles have been written on how to improve power factor (PF). For the most part, they focus on power factor correction (PFC) current-loop tuning, or how to match the phase tracking of the PFC inductor current to the input voltage as closely as possible. This article explores a different angle. Poor PF mostly occurs at high line voltage and light load. Under these conditions, the PFC electromagnetic interference (EMI) filter has a big effect on PF. Because traditional current-loop tuning cannot do much to improve PF, a new method is required to deal with this low-PF issue. PF is defined as the ratio of real power in watts (W) to apparent power, or the product of the root-mean-square (RMS) current and RMS voltage in volt-amperes (VA) as shown by Equation 1.
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