| 摘要 |
PURPOSE:To enable to obtain a constant voltage using a lightweight and low cost constitution by a method wherein the fluctuations of an input AC voltage is detected, and the continuity of a bidirectional thyristor, which is inserted in series in each tap located on the primary side of a transformer, is controlled properly. CONSTITUTION:When the AC input voltage Vab to be inputted to input power source terminals (a) and (b) fluctuates, the voltage to be used for control fluctuates in proportion to the above fluctuation. As a result of said fluctuation, the corresponding comparator is operated and outputs a signal, and the signal is outputted to each of the corresponding FF. On the FF, the smaller numbered one is operated preferentially, only one circuit of the FF outputs a signal while all the remainders are unmovably locked, and among the signal voltages Vg1-Vgn, those on the same row work to allow the Tr on the same row of the transistors Tr1-Trn to operate. As a result, the photocoupler on the same row as photocouplers, H1-Hn starts operation, the thyristors on the same row as bidirectional thyristors TR1-TRn are turned ON, the circuit on the same row as the taps t1-tn of the transformer T is turned to conductive, and a constant voltage is supplied in between the output terminals (b) and (c). |
