Whats Active / Passive PFC ?
Passive PFC, using inductor, capacitor circuitry to reduce harmonic current, because power source frequency is 50 Hz or 60Hz low frequency, it needs large inductor and capacitor. Moreover, the power factor improvement is only around 75%~80%. Active PFC , using active components(control circuit and power sine conductor On/Off switch), the fundamental working theory is to adjust input current wave-form to simulate input voltage waveform. With this method, we can achieve power factor near or equal to the 100% power factor target. Active type power factor correction using active component (control circuit and power sine conductor ON/OFF switch). Its fundamental working theory is to adjust input current waveform to looks like input voltage waveform, this can reach the point where power factor of 1 goal. Also, the input voltage range can be 90Vdc to 264V without additional switch for choosing the voltage range. To have a universal voltage model, this power factor regulator is a very importan
