CN102082558A - Linear speed-regulating potentiometer - Google Patents
Linear speed-regulating potentiometer Download PDFInfo
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- CN102082558A CN102082558A CN2010105904786A CN201010590478A CN102082558A CN 102082558 A CN102082558 A CN 102082558A CN 2010105904786 A CN2010105904786 A CN 2010105904786A CN 201010590478 A CN201010590478 A CN 201010590478A CN 102082558 A CN102082558 A CN 102082558A
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Abstract
The invention discloses a linear speed-regulating potentiometer, which mainly comprises a positive power switch circuit, a negative power switch circuit, a multi-digital band switch, a multi-digital-to-analogue conversion (DAC) circuit and an output circuit. The positive power switch circuit and the negative power switch circuit output voltages with same intensity and opposite polarities; the positive power switch circuit is connected to the positive reference level end of the output circuit; the negative power switch circuit is connected with the negative reference level point of the multi-DAC circuit; and the multi-digital band switch is connected with the output circuit by the multi-DAC circuit. The linear speed-regulating potentiometer is applied to general-purpose machine tools, has the advantages of strong antijamming capability and high reliability, and is difficult to damage.
Description
Technical field
The present invention relates to lathe and drive the field, be specifically related to a kind of linear speed regulation potentiometer that is applied to machine tool.
Background technology
As everyone knows, accurately the machine tool chief axis of control is all very important to the machining accuracy and the production efficiency that improve lathe.The feeding of machine tool (non-Digit Control Machine Tool) and the driver control of main shaft generally all adopt speed-regulating potentiometer (as wirewound potential meter and metal potentiometer) to realize, but the reliability of these potentiometers and useful life are very undesirable.In service statistics after sale, in the fault that such lathe occurs, the fault of potentiometer just accounts for 30%.Based on this reason, development person intends substituting with widely used digital speed-control switch in the digital control system, yet this potentiometer is binary digital switch, thereby before given signal is sent into driver, just can use after need becoming corresponding analog quantity by the D/A circuit conversion.D/A circuit commonly used at present adopts special-purpose D/A analog-digital conversion ic (as DAC0832) to realize more, but still depositing following problems through trying out: 1, anti-interference weak effect, feed speed instability when being transferred to low speed at lathe, feed shaft is difficult to operate as normal; 2, the speed-regulating potentiometer of this circuit composition can't be adjusted servo-driver and spindle driver low speed limit.By analysis, because the power supply of servo-driver and the output of spindle driver analog signal all adopts+10V, and the D/A analog-digital conversion ic can only single power supply, therefore binary system input adopts in the same way that amplifier just has very high input impedance when single supply work, and existing servo-driver and spindle driver all adopt high-power pulse wide modulation, and Machine Tool Circuit is caused very big interference.Secondly, the integrated resistor matrix circuit of special-purpose D/A analog-to-digital conversion can't change in integrated circuit.Moreover high difficult purchase of D/A analog-digital conversion ic price has certain limitation.
Summary of the invention
Technical problem to be solved by this invention is existing machine tool potentiometer poor reliability, low deficiency of life-span, provides that a kind of antijamming capability is strong, reliability is high and non-damageable linear speed regulation potentiometer.
For addressing the above problem, the linear speed regulation potentiometer that the present invention is designed mainly is made of positive supply switching circuit, negative supply switching circuit, long number formula band switch, long number analog conversion circuit and output circuit; Above-mentioned power switch circuit and consistent, opposite polarity two output voltages of negative supply switching circuit output size, and the positive supply switching circuit is connected on the positive reference level end of output circuit, and the negative supply switching circuit then links to each other with the negative reference level point of long number analog conversion circuit; Long number formula band switch links to each other with output circuit through the long number analog conversion circuit.
The described negative supply switching circuit of such scheme mainly is made of first operational amplifier, low-pass filtering electric capacity, 2 switching diodes, 2 electrolytic capacitors and 6 resistance; Be connected across on the positive power source terminal and negative power end of first operational amplifier after wherein first resistance and second resistance are connected mutually; One end of the 3rd resistance is connected between first resistance and second resistance, and the other end then links to each other with the input in the same way of first operational amplifier; The reverse input end of first operational amplifier is connected on the negative power end of first operational amplifier through low-pass filtering electric capacity, the reverse input end of first operational amplifier and in the same way input also respectively be connected on the output of first operational amplifier through a resistance; The output of first operational amplifier is connected by first electrochemical capacitor on the negative pole of first switching diode, and the negative pole of first switching diode is connected on the negative power end of first operational amplifier through second electrochemical capacitor; The anode of second switch diode links to each other with the negative pole of first switching diode, and the negative terminal of second switch diode then links to each other with the negative power end of first operational amplifier; The negative pole of first switching diode is connected on the negative reference level end of long number analog conversion circuit through the 6th resistance.
The described positive supply switching circuit of such scheme mainly is made of rectifier diode, electrochemical capacitor and input resistance; Rectifier diode and electrochemical capacitor are parallel with one another, and the two ends after its parallel connection are connected on respectively between input high level and the ground; One end of input resistance is connected on the input high level, and the other end then links to each other with the positive reference level end of output circuit.
In the such scheme, the output voltage of negative supply switching circuit is-2.5V that the output voltage of positive supply switching circuit is 2.5V.
The described long number analog conversion circuit of such scheme comprises Low ESR resistance bridge, second operational amplifier that high accuracy pressurizer, resistance combine and regulates resistance; The negative reference level end of long number analog conversion circuit is connected on the input in the same way of second operational amplifier through the high accuracy pressurizer; The Low ESR resistance bridge comprises series resistance and sample resistance, and the end after above-mentioned a plurality of series resistance series connection is connected on the negative reference level end of long number analog conversion circuit, and the other end then is connected on the input in the same way of second operational amplifier; One of each sample resistance terminates between above-mentioned 2 series resistances, and the other end then links to each other with a switch on the long number formula band switch respectively; The other end of above-mentioned long number formula band switch is connected on the reverse input end of second operational amplifier jointly; The two ends of regulating resistance are connected on respectively on the reverse input end and output of second operational amplifier; The output of second operational amplifier links to each other with the output port of output circuit.
The described output circuit of such scheme mainly is made of the resistance bridge that positive reference level end, low level end, high-speed output end mouth, low speed output port, electrochemical capacitor and 3 resistance are in series, positive reference level end links to each other with the output of positive supply switching circuit, low level end links to each other with ground, and the output of long number analog conversion circuit is connected on the high-speed output end mouth, is connected on the low speed output port, is connected on the low level end through the resistance bridging through resistance through resistance respectively; The two ends of electrochemical capacitor are connected on respectively between high-speed output end mouth and the low level end.
The present invention adopts the dual power supply mode, by designing the power supply of a negative reference level, adopts reverse negative supply input mode, and impedance is low, antijamming capability is strong, have pure power down signal, efficiently solves the problem of amplifier reverse operation; Add design and reasonable combination in addition to the peripheral resistance of operational amplifier design, anti-interference, machine tool feed low-speed stability and linear aspect improve a lot, can adjust servo-driver and spindle driver low speed limit, given voltage is linear input, is not subjected to the influence of driver input impedance.
Description of drawings
The circuit theory diagrams of a kind of preferred linear speed regulation potentiometer of the present invention.
Embodiment
The circuit theory diagrams that the present invention is a kind of to be used for the linear speed regulation potentiometer on the machine tool as shown in Figure 1, it mainly is made of positive supply switching circuit, negative supply switching circuit, long number formula band switch, long number analog conversion circuit and output circuit; Above-mentioned power switch circuit and consistent, opposite polarity two output voltages of negative supply switching circuit output size, and the positive supply switching circuit is connected on the positive reference level end of output circuit, and the negative supply switching circuit then links to each other with the negative reference level point of long number analog conversion circuit; Long number formula band switch links to each other with output circuit through the long number analog conversion circuit.
Negative supply switching circuit of the present invention mainly is made of the first operational amplifier UIA, low-pass filtering capacitor C 1,2 switching diode D1, D2,2 electrolytic capacitor C2, C3 and 6 resistance R 1～R6; Wherein first resistance R 1 and second resistance R 2 are connected across on the positive power source terminal and negative power end of the first operational amplifier UIA after the series connection mutually; One end of the 3rd resistance R 3 is connected between first resistance R 1 and second resistance R 2, and the other end then links to each other with the input in the same way of the first operational amplifier UIA; The reverse input end of the first operational amplifier UIA is connected on the negative power end of the first operational amplifier UIA through low-pass filtering capacitor C 1, the reverse input end of the first operational amplifier UIA and in the same way input also respectively be connected on the output of the first operational amplifier UIA through a resistance R 4 or R5; The output of the first operational amplifier UIA is connected on the negative pole of the first switching diode D1 by the first electrochemical capacitor C2, and the negative pole of the first switching diode D1 is connected on the negative power end of the first operational amplifier UIA through the second electrochemical capacitor C3; The anode of second switch diode D2 links to each other with the negative pole of the first switching diode D1, and the negative terminal of second switch diode D2 then links to each other with the negative power end of the first operational amplifier UIA; The negative pole of the first switching diode D1 is connected on the negative reference level end of long number analog conversion circuit through the 6th resistance R 6.In the preferred embodiment of the present invention, the output voltage that the negative supply switching circuit produces is-2.5V.
Positive supply switching circuit of the present invention mainly is made of rectifier diode D5, electrochemical capacitor C4 and input resistance R22; Rectifier diode D5 and electrochemical capacitor C4 are parallel with one another, and the two ends after its parallel connection are connected on respectively between input high level and the ground; The end of input resistance R22 is connected on the input high level, and the other end then links to each other with the positive reference level end of output circuit.In the preferred embodiment of the present invention, the output voltage that the positive supply switching circuit produces is 2.5V.
Long number analog conversion circuit of the present invention comprises Low ESR resistance bridge, the second operational amplifier UIB that high accuracy pressurizer Z1, resistance R 7～R17 combine and regulates resistance R 18; The negative reference level end of long number analog conversion circuit is connected on the input in the same way of the second operational amplifier UIB through high accuracy pressurizer Z1; The Low ESR resistance bridge comprises series resistance R7, R9, R11, R13, R15, R17 and R19 and sample resistance R8, R10, R12, R13, R14 and R16, the end of above-mentioned series resistance R7, R9, R11, R13, R15, R17 and R19 is connected on the negative reference level end of long number analog conversion circuit, and the other end then is connected on the input in the same way of the second operational amplifier UIB; One of each sample resistance R8, R10, R12, R13, R14 or R16 terminates between above-mentioned 2 series resistance R7 and R9, R9 and R11, R11 and R13, R13 and R15, R15 and R17 or R17 and the R19, and the other end then links to each other with a switch on the long number formula band switch respectively; The other end of above-mentioned long number formula band switch is connected on the reverse input end of the second operational amplifier UIB jointly; The two ends of regulating resistance R 18 are connected on respectively on the reverse input end and output of the second operational amplifier UIB; The output of the second operational amplifier UIB links to each other with the output port of output circuit.Adjusting resistance of the present invention can adopt potentiometer to realize, but in order to improve the reliability of this adjusting resistance, in the preferred embodiment of the present invention, this regulates resistance when mounted, carries out type selecting according to the specific design demand of different lathes and realizes coupling.
Output circuit of the present invention is mainly by positive reference level end V+, low level end GND, high-speed output end mouth OUT1, low speed output port OUT2, electrochemical capacitor C5 and 3 resistance R 19, R24, the resistance bridge that R25 is in series constitutes, positive reference level end V+ links to each other with the output of positive supply switching circuit, low level end GND links to each other with ground, and the output of long number analog conversion circuit is connected on the high-speed output end mouth OUT1 through resistance R 19 respectively, be connected on the low speed output port OUT2 through resistance R 19 and R25, through resistance bridge R19, R24 and R25 are connected on the low level end GND; The two ends of electrochemical capacitor C5 are connected on respectively between high-speed output end mouth OUT1 and the low level end GND.
Claims (6)
1. the linear speed regulation potentiometer is characterized in that: mainly be made of positive supply switching circuit, negative supply switching circuit, long number formula band switch, long number analog conversion circuit and output circuit; Above-mentioned power switch circuit and consistent, opposite polarity two output voltages of negative supply switching circuit output size, and the positive supply switching circuit is connected on the positive reference level end of output circuit, and the negative supply switching circuit then links to each other with the negative reference level point of long number analog conversion circuit; Long number formula band switch links to each other with output circuit through the long number analog conversion circuit.
2. linear speed regulation potentiometer according to claim 1 is characterized in that: described negative supply switching circuit is mainly by first operational amplifier (UIA), low-pass filtering electric capacity (C1), 2 switching diodes (D1, D2), 2 electrolytic capacitors (C2, C3) and 6 resistance (R1～R6) constitute; Wherein first resistance (R1) and second resistance (R2) are connected across on the positive power source terminal and negative power end of first operational amplifier (UIA) after the series connection mutually; One end of the 3rd resistance (R3) is connected between first resistance (R1) and second resistance (R2), and the other end then links to each other with the input in the same way of first operational amplifier (UIA); The reverse input end of first operational amplifier (UIA) is connected on the negative power end of first operational amplifier (UIA) through low-pass filtering electric capacity (C1), the reverse input end of first operational amplifier (UIA) and in the same way input also respectively be connected on the output of first operational amplifier (UIA) through a resistance (R4 or R5); The output of first operational amplifier (UIA) is connected on the negative pole of first switching diode (D1) by first electrochemical capacitor (C2), and the negative pole of first switching diode (D1) is connected on the negative power end of first operational amplifier (UIA) through second electrochemical capacitor (C3); The anode of second switch diode (D2) links to each other with the negative pole of first switching diode (D1), and the negative terminal of second switch diode (D2) then links to each other with the negative power end of first operational amplifier (UIA); The negative pole of first switching diode (D1) is connected on the negative reference level end of long number analog conversion circuit through the 6th resistance (R6).
3. linear speed regulation potentiometer according to claim 1 is characterized in that: described positive supply switching circuit mainly is made of rectifier diode (D5), electrochemical capacitor (C4) and input resistance (R22); Rectifier diode (D5) and electrochemical capacitor (C4) are parallel with one another, and the two ends after its parallel connection are connected on respectively between input high level and the ground; One end of input resistance (R22) is connected on the input high level, and the other end then links to each other with the positive reference level end of output circuit.
4. according to any described linear speed regulation potentiometer in the claim 1～3, it is characterized in that: the output voltage of negative supply switching circuit is-2.5V that the output voltage of positive supply switching circuit is 2.5V.
5. linear speed regulation potentiometer according to claim 1 is characterized in that: described long number analog conversion circuit comprises high accuracy pressurizer (Z1), resistance (Low ESR resistance bridge, second operational amplifier (UIB) of R7～R17) combine and regulate resistance (R18); The negative reference level end of long number analog conversion circuit is connected on the input in the same way of second operational amplifier (UIB) through high accuracy pressurizer (Z1); The Low ESR resistance bridge comprises series resistance (R7, R9, R11, R13, R15, R17 and R19) and sample resistance (R8, R10, R12, R13, R14 and R16), one end of above-mentioned series resistance (R7, R9, R11, R13, R15, R17 and R19) is connected on the negative reference level end of long number analog conversion circuit, and the other end then is connected on the input in the same way of second operational amplifier (UIB); One of each sample resistance (R8, R10, R12, R13, R14 or R16) terminates between above-mentioned 2 series resistances (R7 and R9, R9 and R11, R11 and R13, R13 and R15, R15 and R17 or R17 and R19), and the other end then links to each other with a switch on the long number formula band switch respectively; The other end of above-mentioned long number formula band switch is connected on the reverse input end of second operational amplifier (UIB) jointly; The two ends of regulating resistance (R18) are connected on respectively on the reverse input end and output of second operational amplifier (UIB); The output of second operational amplifier (UIB) links to each other with the output port of output circuit.
6. linear speed regulation potentiometer according to claim 1, it is characterized in that: described output circuit is mainly by positive reference level end (V+), low level end (GND), high-speed output end mouth (OUT1), low speed output port (OUT2), electrochemical capacitor (C5) and 3 resistance (R19, R24, R25) resistance bridge that is in series constitutes, positive reference level end (V+) links to each other with the output of positive supply switching circuit, low level end (GND) links to each other with ground, and the output of long number analog conversion circuit is connected on the high-speed output end mouth (OUT1) through resistance (R19) respectively, be connected on the low speed output port (OUT2) through resistance (R19 and R25), through resistance bridge (R19, R24 and R25) be connected on the low level end (GND); The two ends of electrochemical capacitor (C5) are connected on respectively between high-speed output end mouth (OUT1) and the low level end (GND).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105904786A CN102082558B (en) | 2010-12-15 | 2010-12-15 | Linear speed-regulating potentiometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105904786A CN102082558B (en) | 2010-12-15 | 2010-12-15 | Linear speed-regulating potentiometer |
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| CN102082558A true CN102082558A (en) | 2011-06-01 |
| CN102082558B CN102082558B (en) | 2013-05-08 |
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| CN2010105904786A Expired - Fee Related CN102082558B (en) | 2010-12-15 | 2010-12-15 | Linear speed-regulating potentiometer |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2238475Y (en) * | 1994-06-15 | 1996-10-23 | 介国安 | Digital potentiometer |
| CN1780142A (en) * | 2004-11-26 | 2006-05-31 | 新日本无线株式会社 | Electronic volume |
| CN201937529U (en) * | 2010-12-15 | 2011-08-17 | 桂林机床股份有限公司 | Linear speed regulating potentiometer |
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2010
- 2010-12-15 CN CN2010105904786A patent/CN102082558B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2238475Y (en) * | 1994-06-15 | 1996-10-23 | 介国安 | Digital potentiometer |
| CN1780142A (en) * | 2004-11-26 | 2006-05-31 | 新日本无线株式会社 | Electronic volume |
| CN201937529U (en) * | 2010-12-15 | 2011-08-17 | 桂林机床股份有限公司 | Linear speed regulating potentiometer |
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| CN102082558B (en) | 2013-05-08 |
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