| 摘要 |
PURPOSE:To control a PWM control converter with good responsiveness by removing a harmonic wave by a filter and setting a firing element ON or OFF whenever the deviation between the output current of the filter and the current command pattern is displaced from the prescribed range. CONSTITUTION:The output current i of an inverter 4 becomes a superposed wave of a sinusoidal current and a triangular current, the output signal of an arithmetic circuit 11 is sinusoidal current, the outputs of arithmetic units 14-16 are produced with the harmonic component as a deviation. When the deviation signal becomes larger than the prescribed value by comparators 17-19 having hysteresis characteristic, a firing element of P side of the converter 4 is fired, and when it becomes smaller than the prescribed value, the firing element on N side of the converter is fired. In this manner, control of good responsiveness can be performed without control delay and phase delay without causing loss with the harmonic wave. |
