| 摘要 |
<p>PROBLEM TO BE SOLVED: To individually control an output voltage of a main seat transformer and an output voltage of a T seat transformer while effectively utilizing output characteristics of the transformers in the case where a control device is provided at an input side of a Scott connection transformer.SOLUTION: A power supply circuit 200 including a Scott connection transformer 2 comprises: a first control device 5 that is provided in one of two phases at an input side of a main seat transformer 2M and controls voltage or current; and a second control device 6 which is provided at one end side of a primary coil 2c that is an input side of a T seat transformer 2T and controls voltage or current. When a secondary coil winding number of the main seat transformer 2M is defined as n1, a secondary coil winding number of the T seat transformer 2T is defined as n2 and a coefficient calculated from excitation impedance of the main seat transformer 2M and excitation impedance of the T seat transformer 2T is defined as (k), in the state where the output voltage of the main seat transformer 2M is connected to a load that requires voltage equal to or higher than k×n1/n2 relative to the output voltage of the T seat transformer 2T, the control devices 5 and 6 individually control the output voltage of the main seat transformer 2M and the output voltage of the T seat transformer 2T.</p> |
