Filter for pulse width modulating inverter

Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components

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323232, H02M 112

Patent

active

056594640

ABSTRACT:
A filter for a pulse width modulating inverter comprises a first inductor coupled to a phase connection of the pulse width modulating inverter, a second inductor coupled between the first inductor at a first-second coupling junction and a load, and a series configuration comprising a resistor and a capacitor coupled in series. The series configuration has one end coupled to the first-second coupling junction. If desired, the first inductor can be coupled between a phase connection of the pulse width modulating inverter and directly to the load, and the series configuration can have one end coupled to the load. The series configuration can further include a third inductor. Furthermore, the series configuration can be replaced by a parallel configuration comprising a resistor and a capacitor coupled in parallel, and the parallel configuration can further include a third inductor coupled in series to the resistor and the capacitor coupled in parallel. A second end of the series configuration can be coupled to a neutral or, if the filter includes a fourth inductor coupled to a second phase connection and a fifth inductor coupled between the fourth inductor at a fourth-fifth coupling junction and the load, the second end can be coupled to the fourth-fifth coupling junction. The filter can be used in single phase or multi-phase applications.

REFERENCES:
patent: 3544855 (1970-12-01), Friedlander et al.
patent: 5047910 (1991-09-01), Levran et al.
patent: 5526252 (1996-06-01), Erdman
patent: 5567994 (1996-10-01), Davis et al.
"Active Filter Design and Specification for Control of Harmonics in Industrial and Commercial Facilities" By Serge Bernard, et al, Power Quality Solutions, Sep. '1995 Proceedings, pp. 197-209.

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