Common mode & differential mode filter for variable speed drive
First Claim
1. An input filter for filtering common mode and differential mode currents, comprising:
- a three-phase inductor having three windings, wherein each winding of the three-phase inductor having a center tap dividing each winding into a pair of inductor sections; and
a three-phase input capacitor bank having three capacitors connected in a wye configuration to the three center taps at one end, and to a common point at the opposite end;
wherein the three-phase input capacitor bank is configured to provide a short circuit for frequencies above a predetermined fundamental frequency for shunting frequencies above a predetermined fundamental frequency through the three phase capacitor bank, while passing the predetermined fundamental frequency to an input AC power source.
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Accused Products
Abstract
Systems and methods for improved Variable Speed Drives having active inverters include an input filter for filtering common mode and differential mode currents. A three-phase inductor has three windings, each winding of the three-phase inductor having a center tap dividing each winding into a pair of inductor sections; and a three-phase input capacitor bank connected in a wye configuration to the three center taps at one end, and to a common point at the opposite end. The three-phase input capacitor bank provides a short circuit for frequencies above a predetermined fundamental frequency for shunting such frequencies through the three phase capacitor bank, while passing the predetermined fundamental frequency to an input AC power source.
95 Citations
9 Claims
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1. An input filter for filtering common mode and differential mode currents, comprising:
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a three-phase inductor having three windings, wherein each winding of the three-phase inductor having a center tap dividing each winding into a pair of inductor sections; and a three-phase input capacitor bank having three capacitors connected in a wye configuration to the three center taps at one end, and to a common point at the opposite end; wherein the three-phase input capacitor bank is configured to provide a short circuit for frequencies above a predetermined fundamental frequency for shunting frequencies above a predetermined fundamental frequency through the three phase capacitor bank, while passing the predetermined fundamental frequency to an input AC power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification