Pfc Inductor Selection

March 15, 2017

Heres a step by step design of a resonant coupled inductor employed in a pfc emi filter that doesnt impact power factor. Inductor selection eatons pfc inductors are available for use with a wide variety of pfcs from 100 w to 250 w.

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Eatons pfc inductors range from 200 uh to 12 mh.

Pfc inductor selection. Many tutorials incorrectly state that it never reaches zero. Input current follows the input voltage as a pure resistor without any input current harmonics. They operate with controllers from several ic manufacturers to provide pfc supply solutions that utilize either passive or active pfc applications table 1.

In a perfect pfc circuit the. Power factor correction pfc shapes the input current of the power supply to be in synchronization with. In reality the current of course reaches zero near input voltage zero crossing.

The mains voltage in order to maximize the real power drawn from the mains. This will not only simplify the design process by making inductor selection easier but also allow circuit and pfc inductor characteristics to be realized under various operating conditions. One reason pfc circuits can be difficult to design is that engineers must fully understand the pfc inductors operating characteristics and its effect on the pfc circuit as design criteria changes.

Design a pfc resonant coupled inductor that doesnt distort power factor. The inductor selection is still extremely custom based upon the circuit designers choices of operating mode frequency range maximum output power efficiency max and min ac voltages output voltage and ripple current. In continuous conduction mode ccm power factor correction pfc circuits the inductor current does not reach zero during most switching cycles.