| 摘要 |
PURPOSE:To reduce the capacity of the power supply transformer of the power supply circuit of an inverter device and reduce the size and weight thereof and improve the power supply efficiency thereof, by full-wave-rectifying in a voltage doubling way the voltage of one secondary circuit of the high-frequency power supply circuit of the inverter device which has a plurality of secondary circuits, and by feeding the rectified voltage thereof to a power supply relay. CONSTITUTION:In the power supply circuit of an inverter device, one terminal of the primary winding of a high-frequency transformer 12 is connected with a transistor 13, and the voltages of the four secondary windings thereof are half-wave-rectified respectively, and independent power supplies U, V, W, X are created. Also, both the terminals of one winding (X) of the secondary windings are connected by the series circuit comprising a resistor 15, a capacitor 16 and a diode 14 which has such a connective polarity that the opposite polarity voltage (negative voltage) to the power supply X is generated. Further, the plus terminal of the power supply X and one terminal of the capacitor 16 are connected by the series circuit comprising a power supply relay 3 and a driving transistor 18 whose base is connected with a photo-coupler 17. Moreover, when the inverter device is not operated, a small quantity of electric power is fed to a high-frequency power supply circuit 6 via a resistor, and in its turn, an exciting circuit 19 is in an operating state, and as a result, in the four secondary circuits of the high-frequency transformer 12, their predetermined voltages are generated respectively. |
