AC power supply unit

Details AC power supply unit AC power supply unit

1995-01-30

1996-10-22

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307 64, 307 87, 307150, H01H 4700

Patent

active

055679960

ABSTRACT:
An ac power supply unit includes first, second and third output terminals. A load is connectable selectively between any two of the output terminals. A dc voltage supply unit supplies a high dc voltage output and has a positive terminal, a center tap terminal connected to the second output terminal, and a ground terminal. A first voltage-controlled switch interconnects the positive terminal of the dc voltage supply unit and the first output terminal. A second voltage-controlled switch interconnects the third output terminal and the ground terminal of the dc voltage supply unit. A third voltage-controlled switch interconnects the positive terminal of the dc voltage supply unit and the third output terminal. A fourth voltage-controlled switch interconnects the first output terminal and the ground terminal of the dc voltage supply unit. A control circuit assembly is connected to the voltage-controlled switches. The control circuit assembly controls the first and second voltage-controlled switches to conduct and the third and fourth voltage-controlled switches to be in a cut-off state during a high cycle of a predetermined frequency cycle and controls the third and fourth voltage-controlled switches to conduct and the first and second voltage-controlled switches to be in a cut-off state during a low cycle of the frequency cycle.

REFERENCES:
patent: 4673825 (1987-06-01), Raddi et al.
patent: 4906859 (1990-03-01), Kobayashi et al.
patent: 5210685 (1993-05-01), Rosa

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