Servo amplifier circuit
AssigneeFujitsu Limited
InventorShuichi Hashimoto
Life of this patent
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Abstract
A servo amplifier circuit, wherein a target value is obtained based on a detected output voltage of the servo amplifier circuit, and the absolute value of the target value is amplified, and then is inverted only when the target value is negative. An offset adusting is carried out by obtaining a forward offset as an output voltage of the servo amplifier circuit without an inversion and an adjustment when the target value is set to zero, and a reverse offset as an output voltage of the servo amplifier circuit with an inversion and without an adjustment when the target value is set to zero, and by obtaining an offset adjusting value using the forward offset and the reverse offset. The absolute value is modified using the offset adjusting value.
Claims5
A servo amplifier circuit comprising:
- an output voltage detecting means for detecting an output voltage of said servo amplifier circuit;
- a target value obtaining means for obtaining a target value of said servo amplifier circuit;
- an absolute value outputting means for outputting an absolute value of said target value;
- a control direction outputting means for outputting a sign of said target value;
- an amplifier means for amplifying an output of said absolute value outputting means;
- a forward/reverse conversion means for passing said output of said amplifier means with or without inverting said output in accordance with said sign of said target value;
- a forward offset obtaining means for obtaining a forward offset which is defined as an output voltage of said servo amplifier without an adjustment when said absolute value is set to zero and said sign is set to plus;
- a reverse offset obtaining means for obtaining a reverse offset which is defined as an output voltage of said servo amplifier circuit without an adjustment when said absolute vale is set to zero and said sign is set to minus;
- an offset adjusting value obtaining means for obtaining an offset adjusting value using said forward offset and said reverse offset;
- and
- an offset adjusting means for modifying the input of said amplifier means using said offset adjusting value, so that the difference between said forward offset and said reverse offset is reduced.
Dependencies are inferred from the claim text.