Neutral forming circuit

Details Neutral forming circuit Neutral forming circuit

1989-08-03

1990-05-01

Salce, Patrick R.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 98, 363132, H02M 5458

Patent

active

049224000

ABSTRACT:
Prior neutral forming circuits for use in developing a neutral voltage for loads coupled to an inverter have been unduly large and heavy or have required that the inverter be operated by a half bridge control which causes less easily filtered harmonics to be produced in the inverter output. In order to overcome these problems, a neutral forming circuit includes first and second impedances coupled together at a junction to form a series combination which is coupled across a pair of DC link conductors coupled to an inverter input and a third impedance coupled between the junction and a neutral terminal at which the neutral voltage is formed, the first through third impedances forming a resonant circuit having a resonant frequency substantially equal to the output frequency of the inverter.

REFERENCES:
patent: 3775663 (1973-11-01), Turnbull
patent: 4617622 (1986-10-01), Fox
patent: 4706180 (1987-11-01), Wills
patent: 4833584 (1989-05-01), Divan
patent: 4847745 (1989-07-01), Shekhawat et al.
patent: 4862342 (1989-08-01), Dhyanchand et al.

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