Circuit to permit three phase input power supply to operate when

Details Circuit to permit three phase input power supply to operate when Circuit to permit three phase input power supply to operate when

1995-03-29

1996-10-08

Deboer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 361111, 361 18, 363 52, H02H 710

Patent

active

055637582

ABSTRACT:
A power supply circuit receives and rectifies a three phase power source. A first capacitor is coupled to filter and store the rectified three phases and supply the stored energy to a DC/DC converter. The first capacitor is large enough, when all three phases are present, to filter the rectified input power and supply rated voltage to the DC/DC converter between peaks in the phases, but not too large as to adversely affect the power factor. However, when one phase drops out, additional capacitance is required to maintain rated voltage to the DC/DC converter during the periodic absence of the one phase. Thus, a switch and a second capacitor are connected in series with each other and in parallel with the first capacitor. In response to absence of one of the phases, the switch is activated to couple the second capacitor to filter and store the rectified two phases and supply the stored energy to the DC/DC converter. The additional capacitance of the second capacitor is sufficient to maintain rated voltage to the DC/DC converter during the absence of the one phase.

REFERENCES:
patent: 4331994 (1982-05-01), Wirth
patent: 4802053 (1989-01-01), Wojtak et al.
patent: 4811190 (1989-03-01), Keir et al.
patent: 4816982 (1989-03-01), Severinsky
patent: 4821166 (1989-04-01), Albach
patent: 4843533 (1989-06-01), Roof et al.
patent: 4933803 (1990-06-01), Kalivas
patent: 5115185 (1992-05-01), Fraidlin et al.

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