Patent ID: 8693854
Filing Date: 2014-04-08
Classification: H01L,H02M

Abstract:
1. A vacuum heating device, comprising: a voltage converter in which a three-phase AC voltage supplied from a three-phase AC power source is input therein, and an AC voltage of which the three-phase AC voltage is converted in magnitude is output as a secondary voltage; and a plurality of loads, each load provided with a predetermined number of heating lamps which can be energized in parallel, the secondary voltage being applied to the heating lamp and the heating lamp radiates heat waves, wherein the voltage converter includes: a plurality of three-phase transformers, including at least one three-phase transformer, including three primary windings, which is connected in a Y-connection shape or a Δ-connection shape to which a three-phase AC voltage is applied, and three secondary windings magnetically coupled to the respective primary windings, one secondary winding supplying power to one of the plurality of loads, respectively; and a plurality of Scott transformers, including at least one Scott transformer including an M-seat transformer and a T-seat transformer, both ends of an M-seat primary winding of the M-seat transformer being connected to any mutually different phases of the three-phase AC voltage, one end of a T-seat primary winding in the T-seat transformer being connected to a midpoint at which the number of turns of the M-seat primary winding is halved, the other end of the T-seat primary winding being connected to a remaining one phase of the three-phase AC voltage, a number of turns of the secondary winding magnetically coupled to the M-seat primary winding being of the same number of turns of the secondary winding magnetically coupled to the T-seat primary winding, and the T-seat primary winding having a number of turns equal to (√3)/2 times that of the M-seat primary winding, wherein the plurality of three-phase transformers and the at least one Scott transformer are used, wherein a multiple p of three loads and a multiple q of two loads, of which a total number of p and q is a number N of loads, are selected, and the number N of loads are provided for other than a multiple of three, wherein the multiple p of three loads are supplied with power from the plurality of three-phase transformers, wherein the multiple q of two loads are supplied with power from the at least one Scott transformer, thereby allowing the heating lamps to generate heat, and wherein p and q correspond to positive integers.