| 摘要 |
PURPOSE:To supply sufficient time for the operation of control angle of a gate pulse outputting device by a method wherein intersection points between respective phases are detected to obtain synchronous signals, and gate pulses are outputted to an output table according to time up signals being decided the timer value thereof by a micro CPU. CONSTITUTION:A timer circuit 51 is driven by the cynchronous signals obtained by detecting the intersection points between three phase AC voltage wave form sent from a synchronous signal generating circuit 3, and moreover control data sent from a terminal T according to the synchronous signals are inputted, and the operation is performed to obtain the timer values to be set in an interval timer 5. The gate pulse output data stored in the micro CPU6 are selected from the line voltages according to the time up signals sent from the timer circuit 51 to be outputted to an I/O port 4, and the outputs thereof are outputted to gates of plural thyristors from a gate output circuit 7. |
