| 摘要 |
PURPOSE:To enable to restart a load simultaneously with power recovery when a power is interrupted by inputting a rotating speed signal of a load at the power interruption time, and supplying a fire control signal to an inverter in response to the rotating speed of the load even during the power interruption. CONSTITUTION:AC from an AC power source 1 is respectively rectified and smoothed by a control rectifier 2 and a smoothing circuit 3, converted into AC by an inverter 5, and supplied to a load 4. A control circuit 10 has a power interruption detector 101, a correcting circuit 102, a switch 103 for stopping the rectifying operation of the rectifier 2, a speed converter 104, a voltage/frequency converter 105, a pulse distributor 105, an output voltage detector 107, a subtractor 108, an automatic voltage regulator 109, a current converter 110, a subtractor 111, an automatic current regulator 112, and an automatic phase controller 113, and produces a fire control signal in response to the rotating speed of the load to the inverter 5 even during the power interruption. |
