CN2100016U - Intellect resistance - Google Patents
Intellect resistance Download PDFInfo
- Publication number
- CN2100016U CN2100016U CN 91221619 CN91221619U CN2100016U CN 2100016 U CN2100016 U CN 2100016U CN 91221619 CN91221619 CN 91221619 CN 91221619 U CN91221619 U CN 91221619U CN 2100016 U CN2100016 U CN 2100016U
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- Prior art keywords
- resistance
- resistance value
- digital quantity
- parallel
- interface
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Abstract
The utility model relates to an intelligent resistor which comprises a keyboard, an LED display interface, a novel digital quantity/resistance value converting interface controlled by a microcomputer. The utility model is characterized in that a flip-latch outputs signals, and after the signals are amplified, the signals control a dry reed relay which is provided with a plurality of normally open contact points mutually connected in series. Each of the normally open contact points is connected with a resistance in parallel. The intelligent resistor has the advantages of good electric contact, high accuracy and simple operation. The utility model can be used for developing measuring and verification systems of computers.
Description
A kind of intelligent electric resistance device relates to the adjustable resistor in the electricity field, is computer-controlled variable linear resistor.
The adjustable resistor that is used for research and production at present, a kind of is the resistor of selecting different resistances by band switch, another kind is the variable resistor of slide wire resistance formula, these two kinds of adjustable resistors, all use the contact that to slide, be easy to the modification of wearing and tearing, caused loose contact.
The name of the bear Xiang invention of Patent Office of the People's Republic of China's bulletin on February 20th, 1991 is called the utility model of " scanning electron potentiometer ", discloses a kind of scanning electron potentiometer.This potentiometer adopts the break-make of the counter controls both sides field effect transistor of trigger series connection formation, a plurality of field effect transistor on discrete both sides are connected mutually, each field effect transistor resistance that resistance value is 2R in parallel, be connected in parallel on the other resistance of field effect transistor, by the unit resistance multiply by 20,1,2 ..., power is arranged for several times naturally, by the conducting of field effect transistor, with parallel resistor short circuit with it, realize different resistances.
Because the conducting resistance of field effect transistor is big (kilo-ohm order of magnitude) quite, therefore the accuracy of this potentiometer is very low, and the form of output resistance is a binary number
A
i2
iR(A is 0 or 1), not directly perceived.
The utility model need not above-mentioned principle.But adopted a kind of digital quantity/resistance value conversion interface circuit of novelty, increase simple, a perfect microcomputer circuit again and constitute.The output resistance of this intelligent electric resistance device can be as accurate as 10
-2Ω.
The purpose of this utility model is, has realized the translation interface technology of digital quantity/resistance value, and has realized the intellectuality of adjustable resistor, has improved accuracy, and setting operation is simply accurate.
The structure of this intelligent electric resistance device comprises parallel input port as shown in Figure 1, random memory ram, read-only memory EPROM, Z80CPU, 3 * 4 keyboards, LED display interface, digital quantity/resistance value translation interface.Wherein parallel input port, by four 8 latch-driver 74LS373 forms, RAM is by two 4 random memories 2114, use constitutes eight side by side.EPROM uses a slice 2716,3 * 4 keyboards, comprises 0～9 10 numeric keys, a decimal key, an execute key.The LED display interface is made of six eight sections charactrons.Digital quantity/resistance value translation interface as shown in Figure 2, comprises 38 latch IC, resistance R 1, triode G1, diode D, switch triode G2, dry-reed relay J, resistance R.
In Fig. 2, triode G1, G2 form multiple tube, improve current amplification factor, and diode D plays the afterflow protective effect.Latch IC exports each, after amplifying through G1, G2, controls a dry-reed relay J.The normal opened contact of all dry-reed relays is cascaded, and resistance R in parallel, thereby resistance R also is arranged in series, and its value is by 1 * 10
-2, 2 * 10
-2, 3 * 10
-2, 4 * 10
-2, 1 * 10
-1, 2 * 10
-1, 3 * 10
-1, 4 * 10
-1..., 1 * 10
3, 2 * 10
3, 3 * 10
3, 4 * 10
3The Ω sequence arrangement.
Digital quantity among Fig. 2/resistance value conversion interface circuit operation principle: at first by the decimal system binary-coded decimal form of computer with resistance value, be converted into the driving sign indicating number that drives dry-reed relay J, export successively by computer again and drive sign indicating number to 3 octal latch IC, driving sign indicating number is four, IC is eight, and every IC can receive two and drive sign indicating number.Drive sign indicating number through IC output, after G1, G2 amplify, control dry-reed relay J's " lead to ", " break " state, driving yard is the position of " 0 ", and G2 is ended, the J no current passes through, its normal opened contact disconnection, with its parallel resistor R with regard to overlapped in series in all-in resistance; Otherwise driving sign indicating number is the position of " 1 ", then makes the G2 conducting, and J has electric current to pass through, its contact adhesive, and R is failed to be connected in series in the all-in resistance by short circuit.
Because JAG-2-H type dry-reed relay, its contact resistance is less than 7 * 10
-5Ω is for being accurate to 10
-2The adjustable resistor of Ω, its contact resistance can be ignored.In other words: the contact resistance of J does not influence the accuracy of output resistance.
Driving sign indicating number is a tetrad, outputs to the driving sign indicating number of octal latch IC, per four controls 1 * 10
n, 2 * 10
n, 3 * 10
n, 4 * 10
nFour resistance of Ω.The different overlapped in series of these four resistance obtain 0 * 10
n, 1 * 10
n..., 9 * 10
nIn ten resistances of Ω any.And whole Fig. 2 circuit can output resolution ratio be 10
-2Ω, range are the arbitrary value in 0～9999.99 Ω scope.Fig. 3 is exactly that the resistance value binary-coded decimal is to the conversion table that drives sign indicating number.
The intelligent electric resistance device, be exactly on the basis of above-mentioned digital quantity/resistance value conversion interface circuit, increase that a simple and perfect microcomputer circuit constitutes, the complete machine operation principle is: by the keyboard input, or by parallel input port input set point, will import data transaction by software and become to drive sign indicating number, output drives sign indicating number to digital quantity/resistance value change-over circuit, then obtain the resistance that sets, and, show the resistance value of output simultaneously by the LED display interface.
Advantage: the accuracy height can be accurate to 10
-2Ω resistance, output resistance are decimal number
A
i10
iΩ, very directly perceived, electrically contact well, simple to operate accurate by the keyboard to set up resistance, owing to have parallel input port, can be used for development computer measurement verification system.
Fig. 1 is the schematic diagram that conforms with subject matter.
Fig. 2 is digital quantity/resistance value conversion interface circuit figure.
Fig. 3 is the binary-coded decimal/driving sign indicating number conversion table of resistance value.
Make: realize 8 RAM side by side by two 4 RAM2114, keyboard adopts encoded keyboard, and EPROM adopts 2716, and parallel input port constitutes query interface with four 74LS373, and LED shows, adopts 8 sections charactrons, can show decimal point.
IC is 74LS273 among Fig. 2, and R1 is 10K Ω, and G1 is 3DG6, and D is 2CP12, and G2 is 3DK4, and J is a JAG-2-H type dry-reed relay, and R can use fixed carbon resister, in order to improve accuracy, also can use wire-wound resistor.
Claims (2)
1, a kind of by keyboard, the LED display interface, parallel input interface, RAM, EPROM, the intelligent electric resistance device that digital quantity/resistance value conversion interface circuit constitutes is characterized in that, 3 * 4 numeric keypads are used for this machine and set resistance; Parallel input port is used for the receiving computer data; LED shows mouth, is used to show resistance value; Digital quantity/resistance value translation interface is used for output resistance, and it connects compositing amplification tube by latch, controls a plurality of normal opened contacts dry-reed relay of series connection mutually, and each contact resistance in parallel constitutes.
According to the intelligent electric resistance device of claim 1, it is characterized in that 2, in digital quantity/resistance value translation interface, the dry-reed relay normal opened contact is connected mutually, each contact resistance in parallel, its resistance is by 1 * 10
-2, 2 * 10
-2, 3 * 10
-2, 4 * 10
-2, 1 * 10
-1, 2 * 10
-1, 3 * 10
-1, 4 * 10
-1..., 1 * 10
3, 2 * 10
3, 3 * 10
3, 4 * 10
3Ω arranges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91221619 CN2100016U (en) | 1991-09-02 | 1991-09-02 | Intellect resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91221619 CN2100016U (en) | 1991-09-02 | 1991-09-02 | Intellect resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2100016U true CN2100016U (en) | 1992-03-25 |
Family
ID=4928584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91221619 Pending CN2100016U (en) | 1991-09-02 | 1991-09-02 | Intellect resistance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2100016U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847974A (en) * | 2009-03-23 | 2010-09-29 | 武汉市创佳源电子有限公司 | Output value digital display of electronic potentiometer module |
| CN102880155A (en) * | 2012-10-18 | 2013-01-16 | 株洲南车时代电气股份有限公司 | System and method for remote control of resistors |
| CN103926853A (en) * | 2014-04-21 | 2014-07-16 | 株洲南车时代电气股份有限公司 | Programmable resistance output device and method |
| CN106843024A (en) * | 2015-12-07 | 2017-06-13 | 贵州电网有限责任公司电力科学研究院 | A kind of wireless rheostat |
-
1991
- 1991-09-02 CN CN 91221619 patent/CN2100016U/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101847974A (en) * | 2009-03-23 | 2010-09-29 | 武汉市创佳源电子有限公司 | Output value digital display of electronic potentiometer module |
| CN102880155A (en) * | 2012-10-18 | 2013-01-16 | 株洲南车时代电气股份有限公司 | System and method for remote control of resistors |
| CN103926853A (en) * | 2014-04-21 | 2014-07-16 | 株洲南车时代电气股份有限公司 | Programmable resistance output device and method |
| CN106843024A (en) * | 2015-12-07 | 2017-06-13 | 贵州电网有限责任公司电力科学研究院 | A kind of wireless rheostat |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| AD01 | Patent right deemed abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |