| 摘要 |
PROBLEM TO BE SOLVED: To provide a digital AGC control method and a feedback control device that enable accurate feedback control in accordance with different sizes of a reference input value.SOLUTION: The digital AGC control method includes: a first step of a digital AGC section 11 outputting a set value depending on a reference input value X; a second step of a PI control section 12 determining a manipulated variable of a controlled object 16 by using the set value; a third step of a DAC 13 generating an output signal Y indicating the manipulated variable; a fourth step of a gain control section 14 and an ADC 15 determining a measured value M of the controlled object; and a fifth step of inputting the measured value M into the digital AGC section 11. The first step stores the reference input value X in a first register, stores the measured value M input in the fifth step in a second register, determines a deviation between the reference input value X and the measured value M to be stored in a third register, detects the number of consecutive bits of value "0" other than a code from an upper side of the first register, and shifts the third register to the left in accordance with the number of bits to generate a deviation set value as the set value. |
