Damped EMI input filter power factor correction circuits

Details Damped EMI input filter power factor correction circuits Damped EMI input filter power factor correction circuits

1994-09-19

1996-06-25

Cunningham, Terry

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327304, 327551, 327561, H04B 110

Patent

active

055303960

ABSTRACT:
An active damping circuit for an electromagnetic interference (EMI) filter for power factor correction (PFC) circuit is provided which simulates a line damping impedance which actively varies according to sensed line current. The active damping circuit comprises an nth-order, Cauer-Chebyshev, low-pass filter having input series damping impedance (Z.sub.d) simulated with a power operational amplifier and high-frequency isolation transformer. The simulated damping impedance offers greatly reduced size and power dissipation as compared to prior art passive schemes which typically require large impedance components for damping. A passive damping circuit is also shown which involves providing an alternate inductive current path in parallel with a damping resistor whereby lower frequency currents are diverted through the alternate current path and higher frequency currents continue to flow through the damping resistor. In this manner, the damping action of the damping resistor is attenuated for lower frequencies but remains unaffected for higher frequencies.

REFERENCES:
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patent: 4594648 (1986-06-01), Gallios
patent: 4748345 (1988-05-01), Landrgraf
patent: 5121009 (1992-06-01), Braathen
patent: 5187384 (1993-02-01), Blockl
patent: 5304898 (1994-04-01), Kataoka et al.
patent: 5305191 (1994-04-01), Loftus, Jr.
patent: 5410221 (1995-04-01), Mattas et al.

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