Rotation position control apparatus of rotary element of filter

A rotating position control apparatus which has a potentiometer comprising a contact element relatively rotating in accordance with a rotation of a rotary element and a resistive element, detects a position of said rotary element as an output of said potentiometer, compares said position with a target rotating position, and moves said rotary element to at least first to third three positions, including:

• an insulator which is provided between terminals of said resistive element;
• a voltage applying circuit for applying a predetermined voltage to one end of said resistive element, applying another predetermined voltage that is lower than said predetermined voltage to the other end, forming a first voltage as an output of said potentiometer when the position of said rotary element indicates the first position and a third voltage that is lower than the first voltage when it indicates the third position, and forming a voltage that is approximate to the third voltage according as it is moved from the first position to the third position, wherein when the first position is commanded as a target rotating position in the case where said rotary element is positioned on the third position, said contact element is moved to the one end of said resistive element so as to pass the other end and said insulator, and
• an A/D converting unit for A/D converting the output of said potentiometer,
• wherein the direction to drive the rotation of said rotary element from a current rotating position to a target rotating position is determined by performing a logical calculation on the basis of a value obtained by A/D converting the output of said potentiometer though said A/D converting unit and a command code to instruct the target rotating position of the rotary element.

A rotating position control apparatus which has a potentiometer comprising a contact element rotating in accordance with a rotation of a rotary element and a resistive element on which said contact element slides, detects a position of said rotary element as an output of said potentiometer, compares the position with a target rotating position as a position to which said rotary element is moved, and moves said rotary element to at least three predetermined positions, comprising:

• an A/D converting unit for A/D converting the output of said potentiometer;
• and
• a control unit for setting a predetermined control code to control the rotation of said rotary element for each of rotating areas divided in a plurality of predetermined ranges on the basis of the target rotating position,
• wherein said control unit control the rotation of said rotary element on the basis of the current position of said rotary element, which is shown by an A/D conversion value through said A/D converting unit, and said control code.

A rotating position control apparatus which has a potentiometer comprising a contact element rotating in accordance with a rotation of a rotary element and a resistive element on which said contact element slides, detects the position of said rotary element as an output of the potentiometer, compares said position with a target rotating position as a position to which the rotary element is moved, and moves said rotary element to at least three predetermined positions, comprising:

• an A/D converting unit for A/D converting the output of said potentiometer;
• and
• a control unit for allowing said A/D converting unit to A/D convert a detection value of the rotary element detected by said potentiometer to set a resultant value as a position table code, and setting the target rotating position of said rotary element as a command table code,
• wherein said control unit drives the rotation of said rotary element in a predetermined rotating direction in which a minimum rotation amount is derived on the basis of the combination of said position table code and said command table code.

A rotating position control apparatus which has a potentiometer comprising a contact element relatively rotating in accordance with a rotation of a rotary element and a resistive element, detects a position of said rotary element as an output of said potentiometer, compares said position with a target rotating position, and moves said rotary element to at least first to third three positions, comprising:

• an insulator which is provided between terminals of said resistive element;
• a voltage applying circuit for applying a predetermined voltage to one end of said resistive element, applying another predetermined voltage that is lower than said predetermined voltage to the other end, forming a first voltage as an output of said potentiometer when the position of said rotary element indicates the first position and a third voltage that is lower than the first voltage when it indicates the third position, and forming a voltage that is approximate to the third voltage according as it is moved from the first position to the third position, wherein when the third position is commanded as a target rotating position in the case where said rotary element is positioned on the first position, said contact element is moved so as to pass one end of said resistive element and said insulator to the other end;
• and
• an A/D converting unit for A/D converting the output of said potentiometer, and a control unit for allowing said A/D converting unit to A/D convert a detection value of the rotary element detected by said potentiometer to set a resultant value as a position table code, and setting the target rotating position of said rotary element as a command table code,
• wherein said control unit drive the rotation of the rotary element in a predetermined rotating direction in which a rotation amount is derived on the basis of the combination of said position table code and said command table code.

A rotating position control apparatus which has a potentiometer comprising a contact element relatively rotating in accordance with a rotation of a rotary element and a resistive element, detects a position of said rotary element as an output of said potentiometer, compares said position with a target rotating position, and moves said rotary element to at least first to third three positions, including:

• an insulator which is provided between terminals of said resistive element;
• a voltage applying circuit for applying a predetermined voltage to one end of said resistive element, applying another predetermined voltage that is lower than said predetermined voltage to the other end, forming a first voltage as an output of said potentiometer when the position of said rotary element indicates the first position and a third voltage that is lower than the first voltage when it indicates the third position, and forming a voltage that is approximate to the third voltage according as it is moved from the first position to the third position, wherein when the first position is commanded as a target rotating position in the case where said rotary element is positioned on the third position, said contact element is moved to the one end of said resistive element so as to pass the other end and said insulator, and
• an A/D converting unit for A/D converting the output of said potentiometer, and a control unit for allowing said A/D converting unit to A/D convert a detection value of the rotary element detected by said potentiometer to set a resultant value as a position table code, and setting the target rotating position of said rotary element as a command table code,
• wherein said control unit drive the rotation of the rotary element in a predetermined rotating direction in which a rotation amount is derived on the basis of the combination of said position table code and said command table code.