| 摘要 |
PURPOSE:To suppress the fluctuation of an output voltage of a voltage type inverter by comparing the output signal of a function generator with that of a time integration counter and controlling a switch in response to the compared value. CONSTITUTION:ROMs 6a, 6b as function generators divide the voltage waveform of sinusoidal AC voltage into electric angles of the prescribed width, and numeric values in response to the integrated voltage and time production value of the sinusoidal AC voltage waveform to the divided zone are stored as data of the divided zones. Time integrating counters 9a, 9b, 10a, 10b count pulse signals of the rescribed period. The outputs of the ROMs 6a, 6b are respectively compared by comparators 7a, 7b, 8a, 8b with the outputs of the counters 9a, 9b, 10a, 10b, and switches 21-26 are controlled ON or OFF in response to the compared results. A resetting circuit 36 synchronizes the input pulse of an address designation counter 4 with those of the counters 9a, 9b, 10a, 10b. |
