| 摘要 |
<p>1,171,845. Voltage changing; apparatus. MOBELEC S.A. HOLDING. 13 Jan., 1967 [14 Sept., 1966], No. 1868/66. Heading H2H. Apparatus for supplying alternating or direct voltages of different values comprises a transformer 1 having tapped primary and secondary windings P, S, a rectifier bridge P1 constituted by semi-conductor elements and a switch 3. Thus the primary winding P will provide a number of alternating voltages from the taps A and the output voltages from the bridge P1 can be selectable by means of the switch 3 and the taps B on the secondary winding S. Further variation in the direct voltage values may be obtained by placing controlled rectifiers in two arms of the bridge P1, by means of the switch 2 to short-circuit the resistor R1 or by using the D.C. output terminal connected to a resistor R3. The apparatus may be used for arc-welding, battery charging, starting internal combustion engines, and for galvanoplastic and electrolytic purposes.</p> |
