Transcription of Active PFC for Electronic Power Supplies
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Active PFC for Electronic Power Supplies
The proliferation of Electronic loads onpower distribution systems has led toinefficient and unsafe conditions dueto the typically poor Power factor ofelectronic Power conversion equip-ment. Waveform distortion and theoverheating of transformers andneutral conductors in three-phasesystems are just a few of the , economic and safetyconcerns along with new regulationsdesigned to maintain the integrity ofpower distribution systems havecreated an acute interest in powerfactor correction (PFC) choosing a strategy for PFC, itis essential to recognize that the poorpower factor occurring in electronicpower conversion equipment isentirely different from the traditionalpoor Power factor seen with inductivemotor loads, and requires a differentcorrective Sources of Poor PFIn its simplest form, poor Power factorcaused by reactive linear circuitelements results as the current eitherleads or lags the voltage, depending onwhether the load looks capacitive orinductive (Figure 1a).
cause the problems with the power distribution system. The power factor of the system shown in Figure 2 can be improved slightly by either adding series inductance with
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