CN204650239U - Program control alternating current-direct current resistance box - Google Patents
Program control alternating current-direct current resistance box Download PDFInfo
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- CN204650239U CN204650239U CN201520221811.4U CN201520221811U CN204650239U CN 204650239 U CN204650239 U CN 204650239U CN 201520221811 U CN201520221811 U CN 201520221811U CN 204650239 U CN204650239 U CN 204650239U
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- resistance
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Abstract
The utility model relates to a kind of program control alternating current-direct current resistance box, comprises controller, digital regulation resistance, voltage sampling circuit, current sampling circuit and operational amplifier; The output terminal of described controller connects digital regulation resistance; Described digital regulation resistance is connected with the output terminal of voltage sampling circuit again; "+" end of the output terminal concatenation operation amplifier of described digital regulation resistance; "-" end of the output terminal concatenation operation amplifier of current sampling circuit; Load is connected with between the output terminal of described operational amplifier and the output terminal of current sampling circuit.The utility model circuit is simple, and without the need to multiple mechanical switch and precision resistance, production cost is extremely low; The utility model only need use a high-accuracy current sampling resistor, simulates a resistance by control figure potentiometer, and this resistance range is wide, and precision is high, may be used for alternating current-direct current occasion; Adopt programmed control method, convenient and computer connects and composes automatization test system.
Description
Technical field
The utility model relates to a kind of program control alternating current-direct current resistance box, utilizes digital regulation resistance and operational amplifier and controller to complete the control of permanent resistance.
Background technology
Resistance box is widely used in the debugging of circuit with test.At present, the resistance box of use is by tens precision resistances through suitable connection, and recycling multidigit rotary switch carrys out the resistance value needed for selection circuit; Also have and adopt several relays of Single-chip Controlling to replace above-mentioned multidigit rotary switch to realize so-called program-controlled resistor case, these resistance boxes are because have employed mechanical switch or relay, after Long-Time Service, its contact can wear and aging cause contact resistance to increase, thus the precision of resistance box is reduced greatly; Make the resistance that high performance resistance box needs to use a lot of high-accuracy, low-temperature coefficient in addition, these resistance are expensive, draw materials not easily.
Summary of the invention
The technical problems to be solved in the utility model is: propose a kind of program control alternating current-direct current resistance box.
The technical scheme that the utility model adopts is: a kind of program control alternating current-direct current resistance box, comprises controller, digital regulation resistance, voltage sampling circuit, current sampling circuit and operational amplifier; The output terminal of described controller connects digital regulation resistance; Described digital regulation resistance is connected with the output terminal of voltage sampling circuit again; "+" end of the output terminal concatenation operation amplifier of described digital regulation resistance; "-" end of the output terminal concatenation operation amplifier of current sampling circuit; Load is connected with between the output terminal of described operational amplifier and the output terminal of current sampling circuit.
The utility model, first according to the resistance value of user's setting, calculates corresponding digital quantity by controller and sends into digital regulation resistance, after digital regulation resistance carries out suitable dividing potential drop to the voltage that voltage sample exports, then sends into "+" end of operational amplifier; The electric current flowing through circuit obtains through current sample and sends into "-" end of operational amplifier; Above-mentioned 2 road signals are through the process of operational amplifier, and make to simulate an ohmic load at circuit RX+ and RX-two ends, the electric current that this load both end voltage flows through with it is proportional, realize permanent resistance and control.
The beneficial effects of the utility model are: 1, circuit is simple, and without the need to multiple mechanical switch and precision resistance, production cost is extremely low; 2, the utility model only need use a high-accuracy current sampling resistor, simulates a resistance by control figure potentiometer, and this resistance range is wide, and precision is high, may be used for alternating current-direct current occasion; 3, adopt programmed control method, convenient and computer connects and composes automatization test system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is structural representation of the present utility model;
In figure: 1, controller; 2, digital regulation resistance; 3, voltage sampling circuit; 4, current sampling circuit; 5, operational amplifier.
Fig. 2 is principle key diagram of the present utility model.
Embodiment
With preferred embodiment, the utility model is described in further detail by reference to the accompanying drawings now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
The framework of a kind of program control alternating current-direct current resistance box as shown in Figure 1, comprises five parts such as controller 1, digital regulation resistance 2, voltage sample 3 circuit, current sampling circuit 4 and operational amplifier 5.Described program control alternating current-direct current resistance box, first according to the resistance value of user's setting, calculate corresponding digital quantity by controller 1 and send into digital regulation resistance 2, after the voltage that digital regulation resistance 2 pairs of voltage sampling circuits 3 export carries out suitable dividing potential drop, then send into "+" end of operational amplifier 5; The electric current flowing through circuit obtains through current sampling circuit 4 and sends into "-" end of operational amplifier 5; Above-mentioned 2 road signals are through the process of operational amplifier 5, and make to simulate an ohmic load at circuit RX+ and RX-two ends, the electric current that this load both end voltage flows through with it is proportional, realize permanent resistance and control.
Principle key diagram described in the utility model is as shown in Figure 2: in the present embodiment, and this circuit is primarily of controller, digital regulation resistance W1, voltage sample amplifier A1, operational amplifier A 2, sampling resistor Rs and current sample amplifier A3 etc. 6 part composition.
If the voltage that external circuit joins this fictitious load two ends is Us, the load current flowing through circuit is Is.
According to circuit connecting relation, being not difficult to obtain the voltage U 1 that operational amplifier A 2 "+" holds is following expression:
Wherein: Ku is the voltage amplification coefficient of voltage sample amplifier A1; Us is the voltage being applied to circuit two ends; Dx is the digital quantity that controller exports; N is the control figure place of digital regulation resistance W1.
The electric U2=IsRs that operational amplifier A 2 "-" is held presses U2 to meet following relation:
Wherein: Is is the load current flowing through circuit; Rs is current sampling resistor value.
Because circuit has close loop negative feedback, U2 should be equaled by the known U1 of the characteristic of operational amplifier, that is:
The resistance Rx that can obtain the simulation of these circuit two ends is further following expression:
Wherein: Us is the voltage joining this fictitious load two ends; Is is the load current flowing through circuit; Ku is the voltage amplification coefficient of voltage sample amplifier A1; Dx is the digital quantity that controller exports; N is the control figure place of digital regulation resistance W1; RS is sampling resistor resistance.
Obviously, have benefited from the ingehious design of circuit, by using a high-precision sampling resistor Rs, coordinate the control to digital regulation resistance, just can simulate different resistance, and this artifical resistance having identical high precision performance with sampling resistor Rs.Suitably control and coordinate to select different sampling resistor Rs to the amplification coefficient Ku of voltage sample amplifier A1 as worked in coordination with by controller again, this circuit just can simulate the resistance value obtaining machine with wide range, and this circuit not only may be used for DC circuit, be applicable to alternating circuit too.Therefore, the utility model scheme can realize the function of program control alternating current-direct current resistance box.
The just embodiment of the present utility model described in above instructions, various illustrating is not construed as limiting flesh and blood of the present utility model, person of an ordinary skill in the technical field after having read instructions can to before described embodiment make an amendment or be out of shape, and do not deviate from essence and the scope of utility model.
Claims (1)
1. a program control alternating current-direct current resistance box, is characterized in that: comprise controller, digital regulation resistance, voltage sampling circuit, current sampling circuit and operational amplifier; The output terminal of described controller connects digital regulation resistance; Described digital regulation resistance is connected with the output terminal of voltage sampling circuit again; "+" end of the output terminal concatenation operation amplifier of described digital regulation resistance; "-" end of the output terminal concatenation operation amplifier of current sampling circuit; Load is connected with between the output terminal of described operational amplifier and the output terminal of current sampling circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520221811.4U CN204650239U (en) | 2015-04-14 | 2015-04-14 | Program control alternating current-direct current resistance box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520221811.4U CN204650239U (en) | 2015-04-14 | 2015-04-14 | Program control alternating current-direct current resistance box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204650239U true CN204650239U (en) | 2015-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520221811.4U Expired - Fee Related CN204650239U (en) | 2015-04-14 | 2015-04-14 | Program control alternating current-direct current resistance box |
Country Status (1)
| Country | Link |
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| CN (1) | CN204650239U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914781A (en) * | 2015-04-14 | 2015-09-16 | 常州信息职业技术学院 | Program controlled AC-DC resistance box |
-
2015
- 2015-04-14 CN CN201520221811.4U patent/CN204650239U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914781A (en) * | 2015-04-14 | 2015-09-16 | 常州信息职业技术学院 | Program controlled AC-DC resistance box |
| CN104914781B (en) * | 2015-04-14 | 2018-04-27 | 常州信息职业技术学院 | Program-controlled alternating current-direct current resistance box |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150916 Termination date: 20180414 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |