| 摘要 |
PROBLEM TO BE SOLVED: To provide a stabilized power supply for a game machine, which is suited to miniaturization. SOLUTION: A primary winding 5 of a main transformer 1 is composed of the first winding 11 of the fixed number of turns and the second winding 12 in which the number of active turns can be selected. The second winding 12, which is connected to a secondary winding 10 of an auxiliary transformer 2, generates a magnetic field by virtue of an alternating voltage induced in the winding 10. A control circuit 3 controls a switch circuit 14 in accordance with an input voltage, and an arbitrary tap, which is selected from among the taps of the second winding 12, is connected to the winding 10, so as to activate a corresponding block. The number of active coils of the winding 5 is made variable by the magnetic field from the activated block of the second winding 12, and drive power of a fixed voltage is supplied without reference to variations in the input voltage.
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