AC VOLTAGE CONTROL APPARATUS

• US 3,614,595 A
• Filed: 01/29/1970
• Issued: 10/19/1971
• Est. Priority Date: 02/12/1969
• Status: Expired due to Term

• Current Assignee: Robert Stewart Paulden
• Original Assignee: Robert Stewart Paulden
• Inventors: Paulden, Robert Stewart
• Primary Examiner(s): Miller, J. D.
• Assistant Examiner(s): Pellinen, A. D.
• Application Number:
  US05/006,696
• Time in Patent Office: 628 Days
• Field of Search: 323/43.5,44,45,47,57,83,91,6
• US Class Current: 323/344
• CPC Class Codes: G05F 1/24 using bucking or boosting transformers as final control devices
• CPC Class Codes: H01F 29/06 with current collector gliding or rolling on or along winding

Abstract

Alternating current voltage control apparatus comprises a coarse and a fine voltage regulator feeding the primary winding of a buck/boost transformer the secondary of which is connected in series with a load. The coarse voltage regulator has two movable contacts capable of passing one another, and has the ends of the winding connected to the two poles of an alternating current supply of the same frequency as that connected to the load. The fine regulator is connected between one contact on the coarse regulator and one pole of the supply and itself carries a movable contact. The primary of the buck/boost transformer is connected between the other movable contact on the coarse voltage regulator and the movable contact on the fine regulator.

Claims

1. Voltage control apparatus for use with alternating current systems, including a first moving-contact autotransformer voltage regulator including a winding, the ends of said winding adapted to be connected directly across an alternating current supply said regulator further having two movable contacts adapted to pass one another along the regulator winding, a second movingcontact autotransformer voltage regulator including a winding, said second regulator arranged to have one end of its winding directly connected to one side of said alternating current supply and having another point on its winding connected to one movable contact on the first voltage regulator and carrying a movable contact capable of traversing part at least of the regulator winding, and a bucking and boosting transformer having its primary winding connected between the other movable contact on the first voltage regulator and the movable contact on the second voltage regulator and with its secondary winding arranged for connection in series with the load to be controlled across an alternating current supply.

2. Voltage control apparatus as claimed in claim 1 in which the movable contact carried by the second voltage regulator is adapted to traverse only that part of the regulator winding adjacent to the point on the winding connected to the said one movable contact of the first voltage regulator.

3. Voltage control apparatus for controlling the voltage supplied to a load adapted to be connected across an alternating current supply comprising a first coarse voltage regulator, said coarse voltage regulator including a winding and two movable contacts arranged for passing one another along the winding, means for connecting said coarse voltage regulator across an alternating curRent supply, a second fine voltage regulator, said fine voltage regulator including a winding and a movable contact, means for connecting said winding between one side of said alternating current supply and said movable contact on the first voltage regulator, said movable contact on said second voltage regulator being arranged to traverse part at least of the associated winding, a bucking and boosting transformer having a primary and a secondary winding, means connecting said primary winding between the other moving contact on the first voltage regulator and the moving contact on the second voltage regulator and means for connecting said secondary winding in series with the load to be controlled.

4. Voltage control apparatus as claimed in claim 3 in which the movable contact carried by the second voltage regulator is adapted to traverse only that part of the associated regulator winding adjacent to the point on the winding connected to the said one movable contact of the first voltage regulator.