CN207456646U - Precision resister synthesis system - Google Patents
Precision resister synthesis system Download PDFInfo
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- CN207456646U CN207456646U CN201721211702.XU CN201721211702U CN207456646U CN 207456646 U CN207456646 U CN 207456646U CN 201721211702 U CN201721211702 U CN 201721211702U CN 207456646 U CN207456646 U CN 207456646U
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- resistance
- operational amplifier
- chips
- measuring
- simulation device
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Abstract
The utility model discloses precision resister synthesis systems, are related to resistance synthesis field；Including：Master controller, multiple resistance simulation devices and the combined resistance corresponding to the resistance simulation device；The master controller is with to sending required resistance signal per resistance simulation device all the way；The resistance simulation device is for receiving a resistance signal, and the ratio for the voltage and electric current for changing place branch forms a virtual resistance Rx；The combined resistance is synthesized by receiving different input voltages and input current progress resistance.The utility model combiner circuit is simple in structure to carry out resistance adjustment instead of traditional resistance box, and the Standard resistance range of combined resistance is big；The resistance stability of synthesis is good, it is not easy to be influenced by external condition and change the resistance of synthesis；It is and more convenient by remote control progress resistance synthesis adjustment.
Description
Technical field
The utility model is related to resistance to synthesize field, especially precision resister synthesis system.
Background technology
Temperature directly affects the important technicals index such as safety in production, production efficiency, product quality, energy-saving and emission-reduction.
It is temperature controlled premise that accurate measurement is carried out to temperature.In numerous temp measuring methods, more common method is Thermistor Temperature Measurement
Method, the method have many advantages, such as that measurement range is big, performance is stable, high sensitivity, easy to install.
In order to which the measuring circuit to thermal resistance sensor or instrument are demarcated to being verified, it is necessary to which automatic imitation is corresponding electric
Resistance.Conventional method is mainly using resistance box or has the prover of fixed value resistance.Although its resistance of resistance box is continuously adjustable,
It can only manually rather than numerical control is adjusted；Some temperature provers control semiconductor resistor by digital regulation resistance, seal in
Contact resistance and conducting resistance, stability is poor, and resistance value is inaccurate.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, provide a kind of precision resister synthesis system, real
Existing combiner circuit is simple in structure to carry out resistance adjustment instead of traditional resistance box, and the Standard resistance range of combined resistance is big；
The resistance stability of synthesis is good, it is not easy to be influenced by external condition and change the resistance of synthesis；And pass through remote control
It is more convenient to carry out resistance synthesis adjustment.
The purpose of this utility model is achieved through the following technical solutions：Precision resister synthesis system, including：It is main
Controller, multiple resistance simulation devices and the combined resistance corresponding to the resistance simulation device；
The master controller is with to sending required resistance signal per resistance simulation device all the way；
The resistance simulation device changes the place voltage of branch and the ratio of electric current for receiving a resistance signal
Value forms a virtual resistance Rx；
The combined resistance is synthesized by receiving different input voltages and input current progress resistance.
Further, the combined resistance includes at least：First operational amplifier, second operational amplifier, D/A conversions
Circuit, measuring resistance circuit, first switch and second switch；
The end in the same direction of first operational amplifier is connected with the output terminal of resistance simulation device, the first operational amplifier
Output terminal is connected with the input terminal of D/A conversion circuits, the output terminal of D/A conversion circuits and the end phase in the same direction of second operational amplifier
Even, the end in the same direction of second operational amplifier is connected with one end of first switch, and the output terminal of second operational amplifier is opened with second
One end of pass is connected, and the one end of the other end of first switch, the other end of second switch respectively with measuring resistance circuit is connected, mark
The other end of quasi- resistance circuit is connected with the output terminal of resistance simulation device.
Further, the measuring resistance circuit includes at least the first measuring resistance, the second measuring resistance, the 3rd standard electric
Resistance and/or the 4th measuring resistance, first measuring resistance, the second measuring resistance, the 3rd measuring resistance and/or the 4th standard electric
The resistance value of resistance is respectively 10 Ω, 100 Ω, 1000 Ω and/or 10000 Ω.
Further, the D/A conversion circuits include at least：First D/A chips, the 2nd D/A chips and the 3rd computing
Amplifier；
The output terminal of first operational amplifier is connected with the first D/A chips with one end of the 2nd D/A chips parallel connection, the first D/
A chips are connected with the other end of the 2nd D/A chips parallel connection with the backward end of the 3rd amplifier, and the output terminal of the 3rd amplifier is connected
It is connected with the backward end of second operational amplifier.
Further, the first D/A chips, the 2nd D/A chips are the D/A chips of 16.
Further, the master controller is industrial personal computer.
Further, the resistance simulation device is regulated power supply and/or one-port network circuit.
The beneficial effects of the utility model are：The utility model combiner circuit is simple in structure to be come instead of traditional resistance box
Resistance adjustment is carried out, and the Standard resistance range of combined resistance is big；The resistance stability of synthesis is good, it is not easy to be influenced by external condition
And change the resistance of synthesis；It is and more convenient by remote control progress resistance synthesis adjustment.
Description of the drawings
Fig. 1 is the block diagram of precision resister synthesis system one embodiment；
Fig. 2 is the circuit diagram of combined resistance one embodiment；
Fig. 3 is the circuit diagram of D/A conversion circuit one embodiment.
Specific embodiment
The technical solution of the utility model, but the scope of protection of the utility model are described in further detail below in conjunction with the accompanying drawings
It is not limited to as described below.
As shown in Figure 1, the block diagram of precision resister synthesis system one embodiment specifically includes：Master controller, Duo Ge electricity
Hinder simulator and the combined resistance corresponding to the resistance simulation device；The master controller is with to per resistance all the way
Simulator sends required resistance signal；The resistance simulation device changes for receiving a resistance signal
The voltage of place branch and the ratio of electric current form a virtual resistance Rx；The combined resistance is by receiving different input voltages
Resistance is carried out with input current to synthesize.
Preferably, the resistance simulation device uses an one-port network circuit, and the one-port network circuit refers to only two
The lattice network that a terminal is connected with other circuits is known as single-terminal-pair circuit；Utilize one-port network circuit combined resistance
Main theoretical basis of the reform of Chinese economic structure is Ohm's law：R=U/I, that is, the voltage and current ratio for changing one-port network both ends obtain equivalent electricity
Resistance value is hindered, during by other circuitry insteads of one-port network circuit equivalent, does not interfere with the branch voltage and electricity of circuit rest part
Stream, but due to the reduction of circuit scale, then can simplify the analysis and calculating of circuit.
As shown in Fig. 2, the circuit diagram of combined resistance one embodiment specifically includes：First operational amplifier A 1,
Two operational amplifier As 2, D/A conversion circuits, measuring resistance circuit, first switch and second switch.First operation amplifier
The end in the same direction of device is connected with the output terminal of resistance simulation device, and the output terminal of the first operational amplifier is defeated with D/A conversion circuits
Enter end to be connected, the output terminals of D/A conversion circuits is connected with the end in the same direction of second operational amplifier, second operational amplifier it is reversed
End is connected with one end of first switch, and the output terminal of second operational amplifier is connected with one end of second switch, first switch
The one end of the other end, the other end of second switch respectively with measuring resistance circuit is connected, the other end and the electricity of measuring resistance circuit
The output terminal of resistance simulator is connected.The resistance value of measuring resistance is Rx, the resistance value of combined resistance is ReBy two operational amplifiers
A1, A2 are connected into voltage follower, to increase input impedance, reduce output impedance.
Preferably, measuring resistance circuit includes at least the first measuring resistance Rx1, the second measuring resistance Rx2, the 3rd standard electric
Hinder Rx3And/or the 4th measuring resistance Rx4, the first measuring resistance Rx1, the second measuring resistance Rx2, the 3rd measuring resistance Rx3With/
Or the 4th measuring resistance Rx4Resistance value be respectively 10 Ω, 100 Ω, 1000 Ω and/or 10000 Ω, pass through switching standards resistance electricity
First switch S1 and second switch S2 and then realize to the resistance value of combined resistance to be R in roadeResistance value adjustment, can realize adaptation
The Standard resistance range of combined resistance needed for different circuits.
That need to illustrate is combined resistance R in the example showneIt is really existing not to be, so with dotted line by its into
Row represent, resistance simulation device use an one-port network circuit, the one-port network circuit refer to only there are two terminal with it is other
The lattice network that circuit is connected is known as single-terminal-pair circuit；Utilize the main theoretical basis of the reform of Chinese economic structure of one-port network circuit combined resistance
It is Ohm's law：It is described that R=U/I, the i.e. voltage at change one-port network both ends obtain equivalent resistance with current ratio
Combined resistance Re。
As shown in figure 3, the circuit diagram of D/A conversion circuit one embodiment specifically includes：First resistor R1, second
Resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first D/A chips,
Two D/A chips and the 3rd operational amplifier A 3；The output terminal of first operational amplifier respectively with one end of first resistor and
One end of two D/A chips is connected, the other end of first resistor respectively with one end of the first D/A chips and one end of second resistance R2
It is connected, the other end of second resistance R2 is connected to the ground, and the other end of the first D/A chips is connected with one end of the 4th resistance R4, the
The other end of two D/A chips is connected with one end of 3rd resistor R3, the other end of 3rd resistor R3, the 4th resistance R4 it is another
End be connected with the backward end of the 3rd operational amplifier A 3, the other end of the 3rd resistor R3, the other end of the 4th resistance R4 and
One end of the 5th resistance R5, the other end ground connection of the 5th resistance R5 are also connected between the backward end of 3rd operational amplifier A 3；The
The end in the same direction of three operational amplifier As 3 connects one end of the 6th resistance R6 and one end of the 7th resistance R7 respectively, the 6th resistance R6's
The other end is grounded, and the other end of the 7th resistance R7 is connected with the output terminal of the 3rd operational amplifier A 3.
Preferably, the first D/A chips, the 2nd D/A chips use the D/A chips of 16, can be by adjusting D/A
The conversion coefficient K of integrated chip changes the resistance value of combined resistance, and the fineness adjustment of combined resistance and D/A integrated chips
Resolution ratio is related, and the digit of D/A integrated chips is bigger, and the fineness adjustment of combined resistance is higher, and precision is also higher.But high-resolution
The D/A integrated chips of rate are expensive, the D/A integrated chips of especially 20 or more.In order to solve between resolution ratio and cost
Contradiction, the present apparatus is by the way of 24 bit resolutions are realized by the D/A of two panels 16.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail in good embodiment, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention
Art scheme is modified or replaced equivalently, and without departing from the objective and scope of technical solution of the present invention, should all be covered at this
Among the right of invention.
Claims (7)
1. precision resister synthesis system, which is characterized in that including：Master controller, multiple resistance simulation devices and with it is described
Combined resistance corresponding to resistance simulation device；
The master controller is with to sending required resistance signal per resistance simulation device all the way；
The resistance simulation device changes the place voltage of branch and the ratio shape of electric current for receiving a resistance signal
Into a virtual resistance Rx；
The combined resistance is synthesized by receiving different input voltages and input current progress resistance.
2. precision resister synthesis system according to claim 1, which is characterized in that the combined resistance includes at least：
First operational amplifier, second operational amplifier, D/A conversion circuits, measuring resistance circuit, first switch and second switch；
The end in the same direction of first operational amplifier is connected with the output terminal of resistance simulation device, the output of the first operational amplifier
End is connected with the input terminal of D/A conversion circuits, and the output terminal of D/A conversion circuits is connected with the end in the same direction of second operational amplifier,
The end in the same direction of second operational amplifier is connected with one end of first switch, the output terminal of second operational amplifier and second switch
One end is connected, and the one end of the other end of first switch, the other end of second switch respectively with measuring resistance circuit is connected, standard electric
The other end of resistance circuit is connected with the output terminal of resistance simulation device.
3. precision resister synthesis system according to claim 2, which is characterized in that the measuring resistance circuit at least wraps
Include the first measuring resistance, the second measuring resistance, the 3rd measuring resistance and/or the 4th measuring resistance, first measuring resistance,
The resistance value of two measuring resistances, the 3rd measuring resistance and/or the 4th measuring resistance be respectively 10 Ω, 100 Ω, 1000 Ω and/or
10000Ω。
4. precision resister synthesis system according to claim 2, which is characterized in that the D/A conversion circuits at least wrap
It includes：First D/A chips, the 2nd D/A chips and the 3rd operational amplifier；
The output terminal of first operational amplifier is connected with the first D/A chips with one end of the 2nd D/A chips parallel connection, the first D/A cores
Piece is connected with the other end of the 2nd D/A chips parallel connection with the backward end of the 3rd amplifier, the output terminal of the 3rd amplifier be connected with
The backward end of second operational amplifier is connected.
5. precision resister synthesis system according to claim 4, it is characterised in that：The first D/A chips, the 2nd D/
A chips are the D/A chips of 16.
6. precision resister synthesis system according to claim 1, it is characterised in that：The master controller is industrial personal computer.
7. precision resister synthesis system according to claim 1, it is characterised in that：The resistance simulation device is voltage stabilizing
Power supply and/or one-port network circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721211702.XU CN207456646U (en) | 2017-09-21 | 2017-09-21 | Precision resister synthesis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721211702.XU CN207456646U (en) | 2017-09-21 | 2017-09-21 | Precision resister synthesis system |
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| Publication Number | Publication Date |
|---|---|
| CN207456646U true CN207456646U (en) | 2018-06-05 |
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ID=62283598
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721211702.XU Expired - Fee Related CN207456646U (en) | 2017-09-21 | 2017-09-21 | Precision resister synthesis system |
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| CN (1) | CN207456646U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709362A (en) * | 2019-01-18 | 2019-05-03 | 南京优倍电气有限公司 | The circuit of artifical resistance is realized using DAC |
-
2017
- 2017-09-21 CN CN201721211702.XU patent/CN207456646U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709362A (en) * | 2019-01-18 | 2019-05-03 | 南京优倍电气有限公司 | The circuit of artifical resistance is realized using DAC |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180605 Termination date: 20180921 |