| 摘要 |
PURPOSE:To improve the response of a feedback loop by holding a minor feedback at zero when the controlled variable of a controlled system is smaller than a specific value. CONSTITUTION:When a detector 35 detects the differential value of a current being larger than a specific reference value, the detector 35 turns on a switch 34. Consequently, a current variation rate control loop is constituted, and the variation rate of the current is brought under feedback control under a current variation command Vrr. In this case, a limiter operates, so the absolute value of a current variation rate command becomes constant, so only the current variation rate control loop operates. The variation rate of the current decreases below the specific reference value by following up a command Vcr, and then the feedback signal of the current variation rate control loop goes down to zero through the turning-off operation of the switch 34, so that only the current control loop is left. The current variation rate loop is turned off to increase the gain of the current control loop.
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