AC power supply unit
First Claim
1. An ac power supply unit for supplying power to an ac load, said ac power supply unit comprising:
- first, second and third output terminals, said load being adapted to be connected to selected ones of said first and second output terminals, said first and third output terminals, and said second and third output terminals;
a dc voltage supply unit for supplying a high dc voltage output, said voltage supply unit having a positive terminal, a center tap terminal connected electrically to said second output terminal, and a ground terminal;
a first voltage-controlled switch interconnecting said positive terminal of said dc voltage supply unit and said first output terminal;
a second voltage-controlled switch interconnecting said third output terminal and said ground terminal of said dc voltage supply unit;
a third voltage-controlled switch interconnecting said positive terminal of said dc voltage supply unit and said third output terminal;
a fourth voltage-controlled switch interconnecting said first output terminal and said ground terminal of said dc voltage supply unit; and
a control circuit connected electrically to said first, second, third and fourth voltage-controlled switches, said control circuit controlling said first and second voltage-controlled switches to conduct and said third and fourth voltage-controlled switches to be in a cut-off state during a high cycle of a predetermined frequency cycle and further controlling said third and fourth voltage-controlled switches to conduct and said first and second voltage-controlled switches to be in a cut-off state during a low cycle of said frequency cycle, thereby providing a first ac voltage output measured across said first and second output terminals when said load is connected between said first and second output terminals, a second ac voltage output which is equal in magnitude to and which is in phase with said first ac voltage output and which is measured across said second and third output terminals when said load is connected between said second and third output terminals, and a third ac voltage output which is equal to a sum of said first and second ac voltage outputs and which is measured across said first and third output terminals when said load is connected between said first and third output terminals.
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Accused Products
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.
7 Citations
12 Claims
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1. An ac power supply unit for supplying power to an ac load, said ac power supply unit comprising:
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first, second and third output terminals, said load being adapted to be connected to selected ones of said first and second output terminals, said first and third output terminals, and said second and third output terminals; a dc voltage supply unit for supplying a high dc voltage output, said voltage supply unit having a positive terminal, a center tap terminal connected electrically to said second output terminal, and a ground terminal; a first voltage-controlled switch interconnecting said positive terminal of said dc voltage supply unit and said first output terminal; a second voltage-controlled switch interconnecting said third output terminal and said ground terminal of said dc voltage supply unit; a third voltage-controlled switch interconnecting said positive terminal of said dc voltage supply unit and said third output terminal; a fourth voltage-controlled switch interconnecting said first output terminal and said ground terminal of said dc voltage supply unit; and a control circuit connected electrically to said first, second, third and fourth voltage-controlled switches, said control circuit controlling said first and second voltage-controlled switches to conduct and said third and fourth voltage-controlled switches to be in a cut-off state during a high cycle of a predetermined frequency cycle and further controlling said third and fourth voltage-controlled switches to conduct and said first and second voltage-controlled switches to be in a cut-off state during a low cycle of said frequency cycle, thereby providing a first ac voltage output measured across said first and second output terminals when said load is connected between said first and second output terminals, a second ac voltage output which is equal in magnitude to and which is in phase with said first ac voltage output and which is measured across said second and third output terminals when said load is connected between said second and third output terminals, and a third ac voltage output which is equal to a sum of said first and second ac voltage outputs and which is measured across said first and third output terminals when said load is connected between said first and third output terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification