CN2617005Y - Programmable standard resistance generator - Google Patents
Programmable standard resistance generator Download PDFInfo
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- CN2617005Y CN2617005Y CN 02245045 CN02245045U CN2617005Y CN 2617005 Y CN2617005 Y CN 2617005Y CN 02245045 CN02245045 CN 02245045 CN 02245045 U CN02245045 U CN 02245045U CN 2617005 Y CN2617005 Y CN 2617005Y
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Abstract
The utility model discloses a programmable standard resistance generator, where a logic control is realized under the control of PC computer software, comprising a bus transceiver (2), a latch drive circuit (3), a relay network (4), a high precision resistance regulation circuit (6) of the basic resistance network (5), and a combinational logic circuit (7), and is directly inserted into the expansion board card of the PC computer XT expansion slot. The PC computer (1) realizes an address gating of the programmable standard resistance generator and a logic control of the bus transceiver (2) and 16 bit data latch drive circuit (3) via the data, address, and control bus under the control of the software, then sends a binary system disciplinary resistance value data to the 16 channel relay drive network (4); the relay switches turns on or off according to the program command, allowing the resistance network to be connected in parallel thereon to generate correspondingly required ohmic value. The utility model has the advantages of small error, high precision, low cost and light weight (weight<=0.5kg). Furthermore, the absolute error reaches a resistance generator less than or equal to 0.2 ohm.
Description
Technical field
The utility model relates to a kind of independent output pure resistance or is used for analog temperature sensor, and electron potentiometer debugging, the standard resistor generating means of calibration are exported or done to resistance signal source.
Background technology
Principle is simple in the known technology, obtain by knob conversion resistance the precision resistance case device because of can not be able to programme, dynamically export pure resistance signal and can not be used in the occasion of dynamic output resistance, and the scope of application limited to, backward in technique and by after advanced electronic equipment get and replace.The disclosed 89108214.X of Chinese patent number, name is called " programmable resistance signal source " patent, according to the dividing potential drop rule, and the two cover resistance generators that under the prerequisite of constant voltage source and resistance, design.Must be through the D/A switch link, this link error about 0.08%FS just only, the precision of the resistance that its is exported is very low, even if in the resistance output area of 0-1000 Ω, error all far can not reach≤requirement of 0.4 Ω.And the 2724A type programmable resistance generator that U.S. VALHALLA SIENTIFC.INC company produces adopts the principle output resistance signal of constant-current source, and to its different resistance output area, the precision of resistance output is ± 0.25 Ω ~ ± 0.4 Ω.It will produce about 0.1% error under the full scale situation, reflex to R output, and Shu Chu resistance is high more in other words, and error is big more, only just may reach when exporting little resistance ± error of 0.25 Ω.If output full scale 6.5536K is Ω, then possible error amount is 6.5536K Ω * 0.1%=6.55 Ω, and be the precision that improves output resistance, only improve constantly the precision of its inner constant-current source, when the precision with inner constant-current source rises to 0.01% (this is extremely difficult thing technically), the precision that just might make output resistance is near 6.5536K Ω * 0.01%=0.655 Ω.Its another weak point is that it is the separator of a PC computer, also need purchase an IEEE488 integrated circuit board in addition during use, is plugged in the expansion slot of PC, could work by the connection of an IEEE488 cable.This installs, and not only body is big, and volume is about mm330 * 280 * 160, weight pact 〉=2.5kg, be equivalent to the PC computer 12 volumes, and valency height, price is up to 6500 dollars/platform (95 years valencys).
Summary of the invention
The purpose of this utility model is to overcome weak point of the prior art, provide that a kind of error is little, precision is high, cost is low, in light weight, volume is little, absolute error all can reach≤resistance generator of 0.2 Ω in 0-6553.6 Ω range.
The purpose of this utility model can be achieved by following technical proposals:
Under the PC computer software control, carry out the The programmable standard hesistance generator of logic control, has a circuit-board card that directly inserts PC computer XT expansion slot, be furnished with printed circuit on the clamp, described printed circuit comprises: connect PC computer data bus and the bus transceiver 2 that is connected with data bus interface, and and bus transceiver 2 be electrically connected successively latch drive circuit 3, relay network 4, basic resistor network 5 and precision resister regulating circuit 6: the input that described bus transceiver 2 latchs drive circuit 3 is connected with combinational logic circuit 7, the data/address bus of the input of this combinational logic circuit 7 and PC computer 1, control bus, address bus links to each other.
Solve resistance R that the basic resistor network 5 of its technical problem is electrically connected in the utility model and be parallel resistor network by turn.
The described resistance of parallel resistor by turn is to make by the binary system rule successively.
The basic resistor network 5 that the utility model solves its technical problem is resistor networks of 16, and the resistance of each resistance position of described 16 resistor network is respectively:
R1＝0.1Ω，R2＝0.2Ω，R3＝0.4Ω，R4＝0.8Ω，R15＝1638.4Ω，R16＝3276.8Ω，
Like this, write at 1 o'clock, corresponding data position and corresponding standard electric resistance R
OutputBetween following table relation arranged:
| Write 1 data bit | D1 | D2 | D3 | D4 | D5 | D6 | D7 | D8 | D9 | D10 | |
| The output R output (Ω) of corresponding resistance position | 0.1 | 0.2 | 0.4 | 0.8 | 1.6 | 3.2 | 6.4 | 12. 8 | 25. 6 | 51. 2 | 102.4 |
| Write 1 data bit | D12 | D13 | D14 | D15 | D16 |
| The output R of corresponding resistance position Output(Ω) | 204.8 | 409.6 | 819.2 | 1638.4 | 3276.8 |
At this moment write certain together fixed sixteen bit system by data/address bus to bus transceiver (2) by PC computer (1) and count a and total R
OutputFollowing relational expression is arranged:
Total resistance R
Output=0.1 * (2
15D16+2
14D15+ ... 2
(i-1)Di+ ... 2
2D3+2
1D2+2
0D1)=0.1 * a
Then a=(2
15D16+2
14D15+ ... 2
(i-1)Di+ ... 2
2D3+2
1D2+2
0D1).
The bus transceiver (2) of the data bus interface of described and computer (1) is 8 or 16 bus transceivers.The described drive circuit 3 that latchs adopts the 2n position to latch drive circuit class chip.
The described drive circuit that latchs can adopt 8 or 16 s' the drive circuit chip that latchs to be, but to be not limited to be that 54/74LS273 latchs drive circuit chip.
The utility model is when making 10,12,14,16, it is respectively R1 ~ R10, R1 ~ R12, R1 ~ R14, R1 ~ R16 that its basic resistor network 5 comes the resistance of coiling by the binary system rule, and the full scale of corresponding resistance generator output resistance is respectively 102.3 Ω, 409.5 Ω, 1638.3 Ω, 6553.5 Ω.
The contact resistance of the pair of contact of the miniature relay that seals in the described relay network≤0.05 Ω, available 6 pairs, 8 pairs, 10 pairs or more to the contact parallel connection, to realize hardware compensating to the resistance output error.
The utility model compared with prior art has following beneficial effect.
The scope of output pure resistance is big, exportable 0 ~ 6.5535K Ω, or bigger scope.
In the gamut of output pure resistance (promptly in 0 ~ 6.5535K Ω), absolute error can reach≤0.2 Ω.
Can carry out line build-out with the method for software, therefore the distance of output can not limit.
The user that the utility model can be made the different resolution and the different scopes of application uses.
Body is little in light weight.Weight≤0.5kg, volume are about 280mm * 150 * 15.The utility model is directly connected in the expansion slot of PC computer, has not only dwindled volume, and has avoided separating the trouble that connects, and has reduced cost, has made things convenient for use.
Description of drawings
Fig. 1 is a circuit structure block diagram of the present utility model.
Fig. 2 is the structural representation of relay drive circuit of the present utility model and resistor network.
Fig. 3 is the utility model its assembled form schematic diagram.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing and embodiment.
Shown in Fig. 1 is preferred circuit block diagram able to programme.It is the device that a kind of intelligence (programmable) can produce the pure resistance signal.It adopts the method for the high precision reference resistance of arranging by the binary system rule being carried out Computer Processing and resnstance transformer, obtains the pure resistance signal source output of dynamic or static high accuracy.Utilize this principle can make tool ± 0.2 Ω precision even more high-precision The programmable standard hesistance generator, make independently " The programmable standard hesistance generator " expansion board clamping of PC computer, extensively adopt for the PC user, also its principle can be rubbed into designer's Component Design, form independently special-purpose member.
Wherein PC computer 1 drives combinational logic circuit 7 realizations to address strobe of the present utility model by data, address, control bus, reach logic control, send the resistance value data of binary system (or hexadecimal) rules then to 16 tunnel relay network 4 bus transceiver and latch driver 3.This relay is the order open and close of follow procedure immediately, and it is corresponding that resistor network on it in parallel is produced, the resistance value that we require.
In Fig. 2, with the normally-closed contact of relay and each resistance of resistor network (R1 ~ R16) in parallel, latch drive circuit 3 and drive No. 16 relays (K1 ~ K16), and will latch drive circuit 3 outputs and be made as logical one and make corresponding relay (K1 ~ K16) action opens corresponding normally-closed contact respectively.
At this moment write a certain fixing sixteen-bit system by data/address bus to bus transceiver 2 by PC computer 1
A, total R
OutputWith data bit following relational expression is arranged:
R
Output=0.1 * (2
15D16+2
14D15+ ... 2
(i-1)Di+ ... 2
2D3+2
1D2+2
0D1)=0.1 * a.
Wherein i is the integer of 1-16, and di represents the state of corresponding i position relay:
Di=1 when relay is connected,
Di=0 during the relay outage.
This shows, produce high-precision standard resistor output able to programme, depend on the coiling precision of R1=0.1 Ω ~ these 16 resistance of R16=6.5536K Ω.
During standard resistor when for example needing to export 269.3 Ω resistance:
R
Output=269.3 Ω=0.1 * 2693=0.1 * (101010000101)=0.1 * (0A85H)=0.1 * a
Promptly writing 0A85H to bus transceiver 2 gets final product.Can 8 pairs, 10 pairs or more in the practice to the contact parallel connection, the output accuracy that this will further improve resistance signal source makes error more be better than 0.2 Ω.
The utility model error is done soft, the compensation of hardware is:
At first the contact resistance error of relay contact is made hardware compensating.
Statistics shows, the contact resistance of 1 pair of contact of sealing miniature relay is≤0.05 Ω approximately, can adopt 6 pairs of contact parallel connections, controls a resistance position, and the error brought because of the relay contact resistance of each resistance position will be in following calculated value like this:
0.05Ω/6＝0.0083Ω＜0.01Ω
Secondly system of the present utility model is made software compensation:
Between the output point from the test point to the resistor network, the systematic error that causes because of the contact resistance between line resistance, device can be sent when several at software, deducts the processing of recompensing of this systematic error.
The interface of the data/address bus of the utility model and PC computer adopts 8 or 16 s' bus transceiver.If adopt 8 bus transceiver, can under the control of combinational logic circuit 7, divide secondary to receive the data-signal of PC computer 1.Can be but be not limited to be the model of 54/74LS245 to this available bus transceiver chip.
Equally, latch drive circuit 3 and can adopt also that 8 or 16 s' latch drive circuit class chip.If adopt 8 the drive circuit chip that latchs, can under combinational logic circuit 7 controls, divide secondary to receive the data-signal of bus transceiver 2 outputs.To this, latching the available chip model of drive circuit is 54/74LS273.
Operation principle of the present utility model is: " write " a certain fixing hexadecimal number " a " by data/address bus to the bus transceiver parts by the PC computer.
R wherein
Output=0.1 * (2
15D16+2
14D15+ ... 2
(i-1)Di+ ... 2
2D3+2
1D2+2
0D1)=0.1 * a
a＝(2
15d16+2
14d15+…2
(i-1)di+…2
2d3+2
1d2+2
0d1)
After bus transceiver 2 is received this hexadecimal number a, just immediately this number is delivered to and latched drive circuit 3, latch drive circuit 3 this number is latched and exports.If no new input data are come in, these data that latch drive circuit 3 will remain unchanged to relay network 4.Relay network 4 receives behind this hexadecimal number a it is the action that drives each the road relay K of self like this: allow the control coil correspondence of relay K on each road connect a certain data carry-out bit that latchs drive circuit 3.When latching this data carry-out bit output " 0 " of drive circuit 3, this relay K is failure to actuate, and it is normally closed that corresponding relays K normally-closed contact keeps, and with this contact parallel resistor short circuit, making this resistance output resistance is 0 Ω.When this data carry-out bit that latchs drive circuit 3 is " 1 ", this actuating of relay, the normally-closed contact of corresponding relays is opened.This moment, the resistance value with this contact parallel resistor output was exactly the resistance value of itself.Output resistance as the 5th is exactly R
Output=R5=1.6 Ω.
The above-mentioned The programmable standard hesistance generator of only having listed 16, but use the user of Standard resistance range at difference, also it can be made The programmable standard hesistance generator such as 10,12,14, figure place more less, the worst error of output resistance will be littler than 0.2 Ω.This is because error is the accumulated error of the inevitable contact resistance of relay contact to be caused, and the few used relay of figure place is also few, and accumulated error also reduces thereupon.
The utility model can be by the PC computer XT bus slot interface with it, also can with any computer that (contains 8 bit data bus) more than 8 bit data bus that contains, comprise the single chip microcomputer interface.The not charged source of the utility model itself, required+5V, ± the 12V DC power supply needs to be provided by the computer of interface with it.
Fig. 3 shows its assembled form of the utility model independence isolated plant.Wherein label 11 is CPU cards of PC computer, label 12 is The programmable standard hesistance generator, label 13 is PC industrial computers, and label 14 is general output interfaces of The programmable standard hesistance generator, and label 15 is special-purpose output interfaces of The programmable standard hesistance generator.
The utility model is applicable to debugging, the calibration of atmosphere data exciter and the atmosphere data internal field exerciser and the electron potentiometer of aircraft industry.
Although above-mentionedly listed specific embodiments more of the present utility model, to one skilled in the art, the modification that can under the situation that does not exceed claim institute restricted portion, make or revise should be at the row of protection of the present utility model to the utility model.
Claims (9)
1. one kind is carried out the The programmable standard hesistance generator that pure resistance is exported under the PC computer software control, has an expansion clamp that directly inserts PC computer XT expansion slot, be furnished with printed circuit on the clamp, it is characterized in that described printed circuit comprises: connect PC computer data bus and the bus transceiver that is connected with data bus interface (2), and and bus transceiver (2) be electrically connected successively latch drive circuit (3), relay network (4), resistor network (5) and precision resister regulating circuit (6) substantially; Described bus transceiver (2), the input that latchs drive circuit (3) is connected with combinational logic circuit (7), and the input of this combinational logic circuit (7) links to each other with data/address bus, control bus, the address bus of PC computer 1.
2. by the described resistance generator of claim 1, it is characterized in that it is parallel resistor network by turn that described relay drives resistance R that network (4) is electrically connected with resistor network (5) substantially.
3. by the described resistance generator of claim 2, it is characterized in that the described resistance of parallel resistor by turn is to make by the binary system rule successively.
4. by the described resistance generator of claim 3, it is characterized in that described basic resistor network 5 is resistor networks of 16.
5. by the described resistance generator of claim 4, it is characterized in that the resistance of each resistance position of described 16 resistor network is respectively: R1=0.1 Ω, R2=0.2 Ω, R3=0.4 Ω, R4=0.8 Ω, R15=1638.4 Ω, R16=3276.8 Ω.
6. by the described resistance generator of claim 5, it is characterized in that the described drive circuit (3) that latchs is 8 or 16 and latchs drive circuit class chip.
7. by the described resistance generator of claim 6, it is characterized in that the described drive circuit chip that latchs is that 54/74LS273 latchs drive circuit chip.
8. by claim 1 or 7 described resistance generators, it is characterized in that bus transceiver (2) with computer (1) data bus interface is 8 or 16 s' a bus transceiver.
9. by the described resistance generator of claim 6, it is characterized in that the miniature relay that seals in the described relay network is 6 pairs, 8 pairs, 10 pairs or how right contact parallel connection, and the contact resistance of every pair of contact≤0.05 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02245045 CN2617005Y (en) | 2002-12-06 | 2002-12-06 | Programmable standard resistance generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02245045 CN2617005Y (en) | 2002-12-06 | 2002-12-06 | Programmable standard resistance generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2617005Y true CN2617005Y (en) | 2004-05-19 |
Family
ID=34238195
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02245045 Expired - Lifetime CN2617005Y (en) | 2002-12-06 | 2002-12-06 | Programmable standard resistance generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2617005Y (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447541C (en) * | 2006-05-23 | 2008-12-31 | 渤海船舶重工有限责任公司 | Multi-path output resistance signal generator |
| CN101251557B (en) * | 2008-03-21 | 2010-06-02 | 苏州思瑞浦微电子有限公司 | Built-in permanence resistor automatic calibration method for high-precision circuit |
| CN102749520A (en) * | 2012-06-19 | 2012-10-24 | 北京康拓科技有限公司 | Multichannel high-precision thermal resistance breadboard based on extensions for instrumentation (PXI) bus |
| CN105022013A (en) * | 2014-04-30 | 2015-11-04 | 惠州市德赛西威汽车电子股份有限公司 | Programmable resistance calibration instrument |
| CN105225777A (en) * | 2014-06-19 | 2016-01-06 | 国网山西省电力公司电力科学研究院 | A kind of microcomputer rheostat of composite type large-range high-resolution |
| CN105551700A (en) * | 2016-01-29 | 2016-05-04 | 深圳中科维优科技有限公司 | Program-controlled multi-channel variable resistor and resistance value adjustment and control method thereof |
| CN105588960A (en) * | 2016-03-14 | 2016-05-18 | 山东大学 | AC/DC universal variable-voltage intelligent load box and application thereof |
| TWI561949B (en) * | 2010-03-18 | 2016-12-11 | Sii Semiconductor Corp | |
| CN106547298A (en) * | 2015-09-17 | 2017-03-29 | 华邦电子股份有限公司 | Reference voltage generator and its operational approach |
| CN109767887A (en) * | 2019-02-12 | 2019-05-17 | 成都凯天电子股份有限公司 | The series-parallel method for combining given output resistance |
-
2002
- 2002-12-06 CN CN 02245045 patent/CN2617005Y/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100447541C (en) * | 2006-05-23 | 2008-12-31 | 渤海船舶重工有限责任公司 | Multi-path output resistance signal generator |
| CN101251557B (en) * | 2008-03-21 | 2010-06-02 | 苏州思瑞浦微电子有限公司 | Built-in permanence resistor automatic calibration method for high-precision circuit |
| TWI561949B (en) * | 2010-03-18 | 2016-12-11 | Sii Semiconductor Corp | |
| CN102749520A (en) * | 2012-06-19 | 2012-10-24 | 北京康拓科技有限公司 | Multichannel high-precision thermal resistance breadboard based on extensions for instrumentation (PXI) bus |
| CN105022013A (en) * | 2014-04-30 | 2015-11-04 | 惠州市德赛西威汽车电子股份有限公司 | Programmable resistance calibration instrument |
| CN105225777B (en) * | 2014-06-19 | 2018-05-25 | 太原理工大学 | A kind of microcomputer rheostat of combined type large-range high-resolution |
| CN105225777A (en) * | 2014-06-19 | 2016-01-06 | 国网山西省电力公司电力科学研究院 | A kind of microcomputer rheostat of composite type large-range high-resolution |
| CN106547298A (en) * | 2015-09-17 | 2017-03-29 | 华邦电子股份有限公司 | Reference voltage generator and its operational approach |
| CN105551700A (en) * | 2016-01-29 | 2016-05-04 | 深圳中科维优科技有限公司 | Program-controlled multi-channel variable resistor and resistance value adjustment and control method thereof |
| CN105588960A (en) * | 2016-03-14 | 2016-05-18 | 山东大学 | AC/DC universal variable-voltage intelligent load box and application thereof |
| CN105588960B (en) * | 2016-03-14 | 2018-07-31 | 山东大学 | A kind of AC/DC universal variable voltage intelligent load case and its application |
| CN109767887A (en) * | 2019-02-12 | 2019-05-17 | 成都凯天电子股份有限公司 | The series-parallel method for combining given output resistance |
| CN109767887B (en) * | 2019-02-12 | 2023-10-24 | 成都凯天电子股份有限公司 | Method for combining given output resistance values in series-parallel connection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Huang Tian dam, Chengdu City, Sichuan Province, China: 610091 Patentee after: AVIC Kaitian electronic Limited by Share Ltd Address before: Huang Tian dam, Chengdu City, Sichuan Province, China: 610091 Patentee before: Chengdu Aviation Instrument Co. |
|
| C56 | Change in the name or address of the patentee |
Owner name: CHINA AVIATION INDUSTRY CORPORATION I-AVIC I KAITI Free format text: FORMER NAME: CHENGDU SPACE METERS CO.,LTD. |
|
| C56 | Change in the name or address of the patentee |
Owner name: CHENGDU KAI TIAN ELECTRONICS CO., LTD. Free format text: FORMER NAME: CHINA AVIATION INDUSTRY CORPORATION I-AVIC I KAITIAN ELECTRONICS CO LTD |
|
| CP03 | Change of name, title or address |
Address after: Huang Tian dam, Qingyang District, Sichuan City, Chengdu Province, China: 610091 Patentee after: Chengdu Caic Electronics Co., Ltd. Address before: Huang Tian dam, Chengdu City, Sichuan Province, China: 610091 Patentee before: AVIC Kaitian electronic Limited by Share Ltd |
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| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121206 Granted publication date: 20040519 |