초록 ▼

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

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.

대표청구항 ▼

A neutral forming circuit which develops a neutral voltage relative to an AC voltage produced at an output frequency by an inverter coupled to first and second DC link conductors, comprising: first and second impedances coupled together at a junction to form a series combination which is coupled acr

A neutral forming circuit which develops a neutral voltage relative to an AC voltage produced at an output frequency by an inverter coupled to first and second DC link conductors, comprising: first and second impedances coupled together at a junction to form a series combination which is coupled across the DC link conductors; 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.