| 摘要 |
PURPOSE:To simplify a control circuit and to improve the controlling performance by using the phase voltage of an AC power source as the upper limit command of the regenerative current as it is to obtain a deviation from the regenerative current, and using it as regenerative control signal. CONSTITUTION:In a bidirectional power rectifier having a rectifier bridge 1, a self-extinguishing switch element 2 and a smoothing capacitor 3, a phase voltage detector 4 and a current detector 5 are provided at the AC power source side of the bridge 1 to obtain a deviation between the phase voltage detected value and the regenerative current detected value. This deviation is amplified by a current regulator 6, compared by a comparator 8 with the output of a carrier signal generator 7 to obtain a PWM signal. The terminal voltage of the capacitor 3 is compared by a comparator 10 with the maximum allowable voltage, and if the terminal voltage is larger, the PWM signal is applied as the regenerative bridge control signal to the bridge 2, and if smaller, the regenerative bridge control signal is interrupted. |
