CN2238475Y - Digital potentiometer - Google Patents
Digital potentiometer Download PDFInfo
- Publication number
- CN2238475Y CN2238475Y CN 94246246 CN94246246U CN2238475Y CN 2238475 Y CN2238475 Y CN 2238475Y CN 94246246 CN94246246 CN 94246246 CN 94246246 U CN94246246 U CN 94246246U CN 2238475 Y CN2238475 Y CN 2238475Y
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- Prior art keywords
- resistance
- digital
- lead
- switch
- out wire
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Abstract
The utility model discloses a digital potentiometer, belonging to the element of the new electronic electric appliance. The utility model is characterized in that a two-bit or multi-bit digital potentiometer is composed of two or a plurality of dial switches, a resistor, a transistor, an operational amplifier, etc. The utility model can make use of the digit of the dial switches to substitute the calibration of the potentiometer; the utility model has good linearity, high precision, and direct-viewing display; the utility model can directly or indirectly substitute the general linear potentiometer or the multi-ring linear potentiometer. The utility model can reach the digital setting purpose in the automatic control of the equipment of the electronic instruments, the industrial automation control, the voltage-stabilizing, the constant current, the power supply, the electromechanical protection, the motor protection, the temperature control, the humidity, the pressure, the weight, etc.
Description
The utility model relates to electronic apparatus component, particularly digital regulation resistance.
Potentiometer mostly was the anglec of rotation in the past, slided and realize the purpose of adjusting in the contact.Occur multiturn potentiometer again in order to improve precision, but fundamentally do not solved digital regulated hope directly perceived.
The purpose of this utility model provides the new Digital potentiometer.And can in some electronic measuring instruments and electronic equipment, replace common linear potentiometer and multi-turn linear potentiometer to carry out data setting.Have that numeral is directly perceived, precision is high, easy to use etc.
The utility model is finished as follows: connect to form two or long number potentiometer with components such as resistance, triode, voltage-stabiliser tube, operational amplifiers through circuit by two or many toggle switchs (or claiming digital switch).Wherein the overall dimension of toggle switch and shape have variedly, but function is 8421 toggle switchs or 1 * 10 toggle switch or special-purpose digital switch.
Connect to form two or long number potentiometer by two or many special-purpose digital switchs and resistance through circuit.Special-purpose digital switch manys two stator contact A, B and a self-cleaning contact C than existing 1 * 10 toggle switch
2Stator contact A and 0 is on same angle position, and B and 1 does not link to each other on same angle position mutually.Self-cleaning contact C
2With C
1On the position of a number that is separated by.C
1With stator contact 0-9 switched conductive, C
2With stator contact 2-B switched conductive.The profile of special-purpose digital switch is identical with existing 1 * 10 toggle switch with mechanical structure.Have 0,1,2,3,4,5,6,7,8,9, A, B, C
1, C
2Have 14 lead-out wires.The resistance string that has 10 resistances to equate on the special-purpose digital switch position is connected on 0-A stator contact lead-out wire, the resistance string that has 11 resistances to equate on the special-purpose digital switch more than ten is connected on the lead-out wire of 0-B stator contact, the resistance that is connected in series on the special-purpose digital switch of low level again with the special-purpose digital switch of a high position on C
1And C
2And connect, wherein 0 of low level with high-order C
1Connect the B of low level and high-order C
2Connect.Each resistance value that is connected in series on the high special-purpose digital switch is bigger 5 times than each resistance of the serial connection on the low special-purpose digital switch.The stator contact " 0 " of highest order special use digital switch and " B " lead-out wire are as the two ends lead-out wire of digital regulation resistance, the moving plate contact C of the special-purpose digital switch of lowest order
1Middle lead-out wire as digital regulation resistance.
Form digital varistor by two or many 8421 toggle switchs and resistance, digital varistor again with the pnp triode, voltage-stabiliser tube, base resistance, collector resistance are formed two or long number potentiometer.Be connected with 4 resistance on 8,421 four lead-out wires of every toggle switch of digital varistor, its resistance value is determined in 8421 ratios reciprocal, after " 1 " end resistance value is determined, " 2 " end resistance value is 1/2 times of " 1 " end, " 4 " end resistance value is 1/4 times of " 1 " end, and " 8 " end resistance value is 1/8 times of " 1 " end.Resistance value on the high toggle switch is 1/10 times of resistance value on the low toggle switch.The other end of all resistance all connects the end lead-out wire as digital varistor on the toggle switch, and self-cleaning contact C end lead-out wire all connects as digital varistor other end lead-out wire on every toggle switch.Digital varistor is as transistor emitter resistance, and an end links to each other with the voltage-stabiliser tube negative pole, connects positive supply, and the other end links to each other with transistor emitter, and the voltage-stabiliser tube positive pole connects transistor base, and the other end of base resistance and collector resistance is ground connection all.The two ends that connect power supply are as digital regulation resistance two ends lead-out wire.Transistor collector is as lead-out wire in the middle of the digital regulation resistance.As use the npn triode, and need to change the positive negative direction of voltage-stabiliser tube, also need change the positive negative direction of power supply.
Form digital varistor by two or many 1 * 10 toggle switchs and resistance, digital varistor again with the pnp triode, voltage-stabiliser tube, base resistance, emitter resistance is formed two or long number potentiometer.The resistance string that every 1 * 10 toggle switch of digital varistor has 9 resistances to equate is connected on 0-9 the lead-out wire, and its 0 end lead-out wire links to each other with the C end lead-out wire of a high toggle switch.Every resistance of a high toggle switch is bigger 10 times than low every resistance value of a toggle switch.0 end of highest order toggle switch and the C of minimum toggle switch end are as two lead-out wires of digital varistor.Digital varistor links to each other with transistor collector as collector resistance one end, and the other end links to each other with ground.The other end of emitter resistance links to each other with the voltage-stabiliser tube negative pole, connects positive supply, and the positive pole of voltage-stabiliser tube connects transistor base, the other end ground connection of base resistance.Connect the two ends lead-out wire of the two ends of power supply as digital regulation resistance, the collector electrode of triode is as the middle lead-out wire of digital regulation resistance.As changing the voltage-stabiliser tube cathode and anode directions, also need change the positive negative direction of power supply with the npn triode.
Form digital varistor by two or many 1 * 10 toggle switchs and resistance, digital varistor is formed digital regulation resistances with operational amplifier, resistance etc. again.Digital varistor is as the operational amplifier negative feedback resistor, a termination operational amplifier negative input end, another termination operational amplifier output terminal.The operational amplifier positive input terminal is formed dividing potential drop by resistance etc. provides reference voltage.Power outlet is also as digital regulation resistance two ends lead-out wire, and operational amplifier output terminal is as digital regulation resistance center lead-out wire.The digital varistor structure is identical with the digital varistor that described 1 * 10 toggle switch of last joint is formed.
Form digital varistor by two or many 1 * 10 toggle switchs and resistance, the units series resistance is 9 * 1 Ω, and tens is 9 * 10 Ω, hundred figure places, 9 * 100 Ω, and thousands digit is 9 * 1K Ω, the myriabit number is 9 * 10K Ω ...The resistance value at AB two ends digital corresponding with digital switch just in time like this.The resistance of bits per inch series resistance and precision can be decided as required.
The utility model has the following advantages than conventional art: digital regulation resistance can replace general linear potentiometer or multi-turn linear potentiometer, can improve the linearity and scale precision, and numerical value is directly perceived.Can be applied to Industry Control, instrument and meter, voltage stabilizing, constant current, power supply, mechanical and electrical protection, temperature, humidity, pressure, weight etc. widely and reach the purpose that numeral is set in the control automatically.
Further describe below in conjunction with accompanying drawing
Fig. 1 is the structure chart of facing of digital regulation resistance
Fig. 2 is the digital regulation resistance circuit theory diagrams that special-purpose digital switch is formed
Fig. 3 is the digital regulation resistance circuit theory diagrams that 8421 toggle switchs are formed
Fig. 4 is the digital regulation resistance circuit theory diagrams that 1 * 10 toggle switch is formed
Fig. 5 is the digital regulation resistance circuit theory diagrams that 1 * 10 toggle switch and operational amplifier are formed
Fig. 6 is the digital varistor that 1 * 10 toggle switch and resistance are formed
With reference to Fig. 1 is the positive TV structures of 3 bit digital potentiometers, and the positive and negative button of pressing can change the numerical value of digital regulation resistance.Toggle switch has multiple contour structures and size, but as long as function meets 8421 toggle switchs, 1 * 10 toggle switch or special-purpose digital switch can be formed digital regulation resistance by the utility model.
By SK (individual position), SK (ten), three 8421 toggle switchs of SK (hundred), form digital varistor with resistance with reference to Fig. 3,4 resistances in individual position are in 8421 ratios reciprocal, be 1.2M Ω, correspondence 1,600K Ω correspondence 2,300K Ω correspondence 4,150K Ω correspondence 8.High-order resistance value is littler 10 times than low level, and promptly ten is 120K Ω correspondence 1,60K Ω correspondence 2,30K Ω correspondence 4,15K Ω correspondence 8.Hundred is 12K Ω correspondence 1,6K Ω correspondence 2,3K Ω correspondence 4,1.5K Ω correspondence 8.When as seen the numeral of digital varistor was big more, resistance value was more little.Then again with pnp triode and collector resistance 4K Ω thereof, base resistance 5.1K Ω, voltage-stabiliser tube 3.7K Ω etc. form the digital regulation resistance circuit.Be actually an adjustable constant-flow source circuit, the numeral that changes 8421 digital switchs has promptly changed pnp transistor emitter resistance, has also changed the voltage drop of collector resistance simultaneously, and its collector electrode output B ' promptly is the correspondent voltage value.If the 15V power supply is inserted at A ' C ' two ends, toggle switch is located on 598 the numeral, promptly hundred figure place C end simultaneously and " 4 " and " 1 " connect, tens C end simultaneously and " 8 " and " 1 " connect units C end and " 8 " connection.At this moment resistance 3K, 12K, 15K, 120K, 150K, 5 resistance form equivalence in parallel for 2.006K as transistor emitter resistance, emitter current is 1.495mA.Because emitter resistance, voltage stabilizing didoe and triode form constant-current source, integrated electrode current be similar to emitter current, and collector resistance is 4K, and the voltage of B ' output just in time is 5.98V in the circuit, digital consistent with the toggle switch setting.Power supply and component parameter can change as required in actual applications.
Form the decit rheostat with reference to Fig. 4 by SK (individual position), SK (ten), three 1 * 10 toggle switchs of SK (hundred) and resistance, high-order resistance value is bigger 10 times than low level resistance value, there are 9 10 Ω resistance string to be connected on 0-9 lead-out wires of toggle switch as SK (individual position), KS (ten) has 9 100 Ω resistance string to be connected on 0-9 lead-out wires of ten toggle switchs, SK (hundred) has 9 1K Ω resistance string to be connected on 0-9 lead-out wires of hundred figure place code switches, and 0 end of low level is connected with the C end of a high position.Then again with pnp triode and emitter resistance 3.3K Ω thereof, base resistance 5.1K Ω, 4V voltage-stabiliser tube form the digital regulation resistance circuit.In fact also be constant-current source circuit because emitter resistance 3.3K Ω and voltage-stabiliser tube 4V are constant, integrated electrode current just in time constant current at 1mA.At this moment decimal rheostat as long as change the numerical value of toggle switch, has promptly changed collector resistance as collector resistance.The voltage of collector electrode output B ' end also changes thereupon, if toggle switch is set on 518 the numerical value, the series resistance of decimal rheostat is 5.18K Ω, and constant-current source is 1mA, and the magnitude of voltage that circuit B ' end is exported is 5.18V, and is just in time corresponding with toggle switch numerical value.
Form the decit rheostat with reference to Fig. 5 by SK (individual position), SK (ten), three 1 * 10 toggle switchs of SK (hundred) and resistance, it is 10 100 Ω that SK (individual position) goes up resistance, it is 10 1K Ω that SK (ten) goes up resistance, it is 10 10K Ω that SK (hundred) goes up resistance, be serially connected in respectively on the lead-out wire of toggle switch 0-9,0 end of low level is connected with the C end of a high position.Digital varistor is formed digital regulation resistance as the negative feedback resistor of operational amplifier then.When the given normal voltage of the positive input terminal of operational amplifier, change toggle switch numerical value, promptly changed the negative feedback resistor of operational amplifier, its multiplication factor is respective change also.If the given 10mV standard of the positive input terminal of operational amplifier, toggle switch is set on 418 numerical value, and at this moment the amplification multiple of operational amplifier just in time is 418 times, so the voltage of its output B ' end just in time is 4.18V.
Form the decit rheostat with reference to Fig. 6 by SK (individual position), SK (ten), SK (hundred), SK (kilobit), five 1 * 10 toggle switchs of SK (myriabit) and resistance.It is 91 Ω that SK (individual position) goes up resistance, it is 9 10 Ω that SK (ten) goes up resistance, it is 9 100 Ω that SK (hundred) goes up resistance, it is 9 1K Ω that SK (kilobit) goes up resistance, it is 9 10K Ω that SK (myriabit) goes up resistance, be connected on respectively on the lead-out wire of toggle switch 0-9,0 end of low level is connected with the C end of a high position.
The various data of above digital regulation resistance also need to change in conjunction with actual conditions when using.
(components and parts are mostly introduced in explanation, so inventory omits)
Claims (6)
1, digital regulation resistance, it is characterized in that connecting to form two above digital regulation resistances through circuit by elements such as 2 above plucking number sign switches or title digital switch and resistance, plucking number sign switch has 8421 plucking number sign switches, 1 * 10 plucking number sign switch and special-purpose digital switch, every plucking number sign switch all is 0,1,2,3,4,5,6,7,8,90 gear, and wherein special-purpose digital switch whenever has only 0,1,2,3,4,5,6,7,8,9, A, B, C
1, C
2Article 14, lead-out wire is connected with circuit, and 1 * 10 plucking number sign switch has 0,1,2,3,4,5,6,7,8,9,11 lead-out wires of C are connected with circuit, and 8421 plucking number sign switches have 8,4,2,1, five lead-out wires of C are connected with circuit.
2, according to the said digital regulation resistance of claim 1, it is characterized in that connecting to form two or long number potentiometer through circuit by two or many special-purpose digital switchs and resistance, special-purpose digital switch has 0,1,2,3,4,5,6,7,8,9,12 stator contacts of A, B, and C is arranged
1And C
2Two self-cleaning contacts on the position of a number that is separated by respectively with stator contact 0-9 and 2-B switched conductive, the resistance string that has 10 resistances to equate on the special-purpose digital switch position is connected on 0-A stator contact lead-out wire, the resistance string that has 11 resistances to equate on the special-purpose digital switch more than ten is connected on the lead-out wire of 0-B stator contact, the resistance that is connected in series on the special-purpose digital switch of low level again with the special-purpose digital switch of a high position on C
1And C
2And connect, wherein 0 of low level with high-order C
1Connect the B of low level and high-order C
2Connect, each resistance that is connected in series on the high special-purpose digital switch is bigger 5 times than each resistance that is connected in series on the low special-purpose digital switch, the stator contact " 0 " of highest order special use digital switch and " B " lead-out wire are as the two ends lead-out wire of digital regulation resistance, the moving plate contact C of the special-purpose digital switch of lowest order
2Middle lead-out wire as digital regulation resistance.
3, it is characterized in that forming digital varistor according to the said digital regulation resistance of claim 1 by two or many 8421 toggle switchs and resistance, digital varistor again with the PNP triode, voltage-stabiliser tube, base resistance, collector resistance is formed two or long number potentiometer, digital varistor is as emitter resistance, one end links to each other with the voltage-stabiliser tube negative pole, connect positive supply, the digital varistor other end links to each other with transistor emitter, the anodal transistor base that connects of voltage-stabiliser tube, the other end of base resistance and collector resistance is ground connection all, the two ends that connect power supply are as digital regulation resistance two ends lead-out wire, transistor collector is as lead-out wire in the middle of the digital regulation resistance, be connected with 4 resistance on 8,421 four lead-out wires of every toggle switch, its resistance value is determined in 8421 ratios reciprocal, " 2 " end resistance value is 1/2 times that hold " 1 " after " 1 " end resistance value is determined, " 4 " end resistance value is 1/4 times of " 1 " end, " 8 " end resistance value is 1/8 times of " 1 " end, and the resistance value on the high toggle switch is 1/10 times of resistance value on the low toggle switch.
4, according to the said digital regulation resistance of claim 1, it is characterized in that forming digital varistor by two or many 1 * 10 toggle switchs and resistance, digital varistor again with the pnp triode, voltage-stabiliser tube, base resistance, emitter resistance is formed two or long number potentiometer, digital varistor links to each other with transistor collector as collector resistance one end, the other end links to each other with ground, the other end of emitter resistance links to each other with the negative pole of voltage-stabiliser tube, connect positive supply, the positive pole of voltage-stabiliser tube connects transistor base, the other end ground connection of base resistance, connect the two ends lead-out wire of the two ends of power supply as digital regulation resistance, transistor collector is as the middle lead-out wire of digital regulation resistance, the resistance string that every 1 * 10 toggle switch has 9 resistances to equate is connected on 0-9 drawn on the line, its 0 end lead-out wire links to each other with the C end lead-out wire of a high toggle switch, and every resistance of a high toggle switch is bigger 10 times than low every resistance of a toggle switch.
5, according to the said digital regulation resistance of claim 1, it is characterized in that forming digital varistor by two or many 1 * 10 toggle switchs and resistance, digital varistor again with operational amplifier, resistance etc. are formed digital regulation resistance, digital varistor is as the operational amplifier negative feedback resistor, one termination operational amplifier negative input end, another termination operational amplifier output terminal, the operational amplifier positive input terminal is formed dividing potential drop by resistance etc. provides reference voltage, power outlet is also as digital regulation resistance two ends lead-out wire, operational amplifier output terminal is as digital regulation resistance center lead-out wire, the resistance string that every 1 * 10 toggle switch has 9 resistances to equate is associated on 0-9 the lead-out wire, its 0 end lead-out wire links to each other with the C end lead-out wire of a high toggle switch, and every resistance of a high toggle switch is bigger 10 times than low every resistance of a toggle switch.
6, according to claim 1, claim 4, the said digital regulation resistance of claim 5, it is characterized in that forming digital varistor by two or many 1 * 10 toggle switchs and resistance, the resistance string that every 1 * 10 toggle switch has 9 resistances to equate is connected on 0-9 the lead-out wire, its 0 end lead-out wire links to each other with the C end lead-out wire of a high toggle switch, every resistance of a high toggle switch is bigger 10 times than low every resistance of a toggle switch, and 0 end of highest order toggle switch and the C of lowest order toggle switch end are as two lead-out wires of digital varistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94246246 CN2238475Y (en) | 1994-06-15 | 1994-11-18 | Digital potentiometer |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94216196.3 | 1994-06-15 | ||
| CN94216196 | 1994-06-15 | ||
| CN 94246246 CN2238475Y (en) | 1994-06-15 | 1994-11-18 | Digital potentiometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2238475Y true CN2238475Y (en) | 1996-10-23 |
Family
ID=34065538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94246246 Expired - Fee Related CN2238475Y (en) | 1994-06-15 | 1994-11-18 | Digital potentiometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2238475Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082558A (en) * | 2010-12-15 | 2011-06-01 | 桂林机床股份有限公司 | Linear speed-regulating potentiometer |
| CN102663926A (en) * | 2012-05-10 | 2012-09-12 | 黄莹 | Upgradable Braille learning machine |
| CN107764178A (en) * | 2017-11-06 | 2018-03-06 | 武汉航空仪表有限责任公司 | A kind of wire-wound potentiometer linearity adjustment method |
| CN115101275A (en) * | 2022-05-18 | 2022-09-23 | 北京石油化工学院 | Potentiometer device and method for determining number of switching-on/switching-off times of shifting switch |
-
1994
- 1994-11-18 CN CN 94246246 patent/CN2238475Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082558A (en) * | 2010-12-15 | 2011-06-01 | 桂林机床股份有限公司 | Linear speed-regulating potentiometer |
| CN102082558B (en) * | 2010-12-15 | 2013-05-08 | 桂林机床股份有限公司 | Linear speed-regulating potentiometer |
| CN102663926A (en) * | 2012-05-10 | 2012-09-12 | 黄莹 | Upgradable Braille learning machine |
| CN107764178A (en) * | 2017-11-06 | 2018-03-06 | 武汉航空仪表有限责任公司 | A kind of wire-wound potentiometer linearity adjustment method |
| CN107764178B (en) * | 2017-11-06 | 2020-08-11 | 武汉航空仪表有限责任公司 | Method for debugging linearity of wire-wound potentiometer |
| CN115101275A (en) * | 2022-05-18 | 2022-09-23 | 北京石油化工学院 | Potentiometer device and method for determining number of switching-on/switching-off times of shifting switch |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |