| 摘要 |
PURPOSE:To enable to output a firing pulse having the prescribed phase by treating the first and second interrupt signals to correct the counted value of a counter, thereby eliminating the repeated rapid calculations of a microcomputer in accordance with the current phase angle applied from a vector controller and the instruction value of the inverter frequency. CONSTITUTION:The time of the inverter of firing pulses applied to a power converter (which is a current type inverter) 1 through a pulse amplifier 4 from the frequency f1 of an inverter and the instruction value of a current phase angle (beta) is calculated by a microcomputer 3, counted by a counter 6 attached externally of the microcomputer 3, the decision of the firing pulse and the procedure of the output are performed by the interrupt signal D produced at the counting up time, thereby reducing the calculating time necessary to control the microcomputer 3 via the firing pulse, and the microcomputer 3 which has relatively slow calculation can control it. |
