Method for directing power between three-phase mains and a d.c.

Details Method for directing power between three-phase mains and a d.c. Method for directing power between three-phase mains and a d.c.

1987-05-20

1988-09-27

Salce, Patrick R.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

363126, H02M 7537

Patent

active

047746505

ABSTRACT:
A method for directing the power of a d.c. voltage source between a three-phase mains and a d.c. circuit, which comprises the steps of employing a diode bridge comprising a plurality of first diodes to rectify a three-phase mains voltage to a d.c. voltge when power is flowing from the three-phase mains to the d.c. circuit, converting the d.c. voltage to a three-phase a.c. voltage, when power is flowing from the d.c. circuit to the three-phase mains, by means of transistors in parallel with the diodes, employing control means for controlling the transistors, forming control voltages for the control means by a plurality of second diodes from the three-phase mains in such manner that each the transistor is conductive during the conduction time of the respective diode in parallel therewith, and shortening the conduction times of the transitors, in order to reduce the power circulating in the d.c. circuit, by connecting Zener diodes in series with respective ones of the transistors.

REFERENCES:
patent: 4272807 (1981-06-01), Gallagher
patent: 4446513 (1984-05-01), Clenet
patent: 4447868 (1984-05-01), Turnbull
patent: 4449176 (1984-05-01), Turnbull
patent: 4495557 (1985-01-01), Weit
patent: 4620272 (1986-10-01), Fulton et al.

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