CN104678133A - Programmable direct current electronic load device - Google Patents
Programmable direct current electronic load device Download PDFInfo
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- CN104678133A CN104678133A CN201310615967.6A CN201310615967A CN104678133A CN 104678133 A CN104678133 A CN 104678133A CN 201310615967 A CN201310615967 A CN 201310615967A CN 104678133 A CN104678133 A CN 104678133A
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Abstract
The invention relates to a programmable direct current electronic load device, which comprises a software part and a hardware part, wherein the hardware part comprises a selection and I/O (input/output) port distribution module of a single chip microcomputer, a liquid crystal display, a keyboard input circuit, a D/A (digital to analog) conversion circuit, a voltage and current sampling circuit, a negative feedback control loop and a power source circuit. A programmable direct current electronic load has the advantages that the heat radiating property is good, the operation is convenient, and the accuracy is higher; the programmable direct current electronic load can be applied to the load testing; the electronic load system comprises the software part and the hardware part, and the hardware part of the electronic load system comprises (1) the selection and I/O (input/output) port distribution module of the single chip microcomputer; (2) the liquid crystal display; (3) the keyboard input circuit; (4) the D/A conversion circuit; (5) the voltage and current sampling circuit; (6) the negative feedback control loop; (7) the power source circuit; the software program part of the electronic load system comprises (1) a press key information program and a liquid crystal display output program; (2) a voltage and current sampling program, an A/D (analog to digital) conversion program and a D/A conversion program.
Description
Technical field
What the present invention relates to is a kind of electronic load, particularly be a kind of programmable DC electronic load.
Background technology
Electronic load absorbs electric energy and a kind of load being consumed and design according to electronic component, and its electronic component is generally power field effect pipe (power MOS), insulated gate bipolar transistor (IGBT) etc.In traditional application, resistance is a kind of load that we know very much, and it can as the carrier consuming electric energy.And this traditional load has a lot of drawback.Along with the development of science and technology, electronic load will alternative conventional load gradually.Electronic load mainly instead of resistance with power semiconductor device, makes more easily to change load resistance and control, and stability also can improve accordingly, can say, the appearance of ohmic load overcomes many drawbacks of conventional load.Meanwhile, the electronic load that we can be different according to the Demand Design of oneself, has met the different demands of people, even the load of some special waveform curves.This is not attainable in conventional load such as resistance.And some support equipments of application ohmic load have also been obtained and develop fast, and the development of this fast and stable for electronic load is significant.
All load testing can be used in the various fields of people's life, such as various communication power supply test, generator, motor delivery test etc., be difficult to any test meeting of the imagination not applying electronic load now, the electronic load life having penetrated into us gradually, and play the effect wanted emphatically.Current, reach the decisive stage to the research of electronic load both at home and abroad, a lot of producer is all at the electronic load of research and development application in special circumstances.For test load used, circumstances both domestic and external is similar, major part is using the classic method of static load, static load comprises our common resistance, resistance box etc., but this traditional method shortcoming is too many, bad, inconvenient operation, the accuracy rate of such as dispelling the heat is inadequate etc., does not reach people's the set goal at all.People are for test comparatively it is of concern that output current is constant, and itself is with output interface, and the parameters such as resistance can arbitrarily regulate, and at present, above-mentioned a lot of index is also difficult to reach.
Summary of the invention
The object of this invention is to provide a kind of good heat dissipation, the programmable DC electronic load being applied to load testing that easy to operate, accuracy rate is higher.
The object of the present invention is achieved like this:
A kind of programmable DC electronic load device, its composition comprises software and hardware two large divisions, wherein hardware components comprise the selection of single-chip microcomputer and input/output port distribution module, liquid crystal display, input through keyboard, D/A changes, electric current and voltage is sampled, negative feedback control loop, power circuit.
Described a kind of programmable DC electronic load device, is characterized in that described software program portion comprises: key information program, LCD display output program, sampling routine, A/D converse routine and D/A converse routine.
Described a kind of programmable DC electronic load device, it is characterized in that negative feedback control loop is as core, and metal-oxide-semiconductor is the core devices of negative feedback control loop.
Electronic load system is divided into software and hardware two large divisions.When carrying out system, take into full account the factors such as price, operating rate, cost of development, reliability and realizability, comprehensively analyze the feature of software and hardware, in line with the principle of reasonable distribution resource, software and hardware is carried out reasonably arranging, to play its maximum effect.
This design is mainly in order to complete the making of the electronic load that can work under constant current mode, negative feedback control loop is core, and metal-oxide-semiconductor is the core devices of negative feedback control loop, here metal-oxide-semiconductor is not just as control device, can also serve as the power source loads that you will test.PI controller controls to play regulating action, once there is deviation in system, proportion adjustment will produce regulating action to reduce deviation, and the effect of integral adjustment makes system eliminate steady-state error, as long as there is error to exist, integral adjustment will play a role, until error is completely eliminated, integral adjustment just can stop.Core controller part adopts single-chip microcomputer, and STC89C52 is a kind of low-power consumption, high performance microcontroller, and it can input numerical value from the external world, and produces reference voltage by D/A change-over circuit.At this moment, PI controller will work, and the actual numerical value that you can input by it is compared with the reference voltage changed by D/A, obtains deviation between the two, thus departure, and finally realize the object of constant current mode work.For the ease of observing, native system devises LCD screen display module, the display voltage and current instantly that it can be instant.But the signal that we have just received is simulation, and this just needs to carry out the conversion between modulus, and native system A/D converter can realize simulating signal and be converted to digital signal.Writing again by program, shows the net result liquid crystal display of conversion.
Advantage of the present invention:
Various piece be all application module design there is good versatility, wherein keyboard and LCD display module well achieve man-machine interaction.
Apply metal-oxide-semiconductor, so not only make the speed of whole system fast, and static power attenuation can not be produced, metal-oxide-semiconductor grid impedance is infinitely great, a kind of voltage-controlled device being controlled output current by gate-source voltage, so not only power saving more, and more easily drive.
Accompanying drawing explanation
Fig. 1 is the theory diagram of system;
Fig. 2 is software flow figure.
Embodiment
Below in conjunction with accompanying drawing citing, the present invention is described in more detail:
A kind of programmable DC electronic load device, its composition comprises software and hardware two large divisions, wherein hardware components comprise the selection of single-chip microcomputer and input/output port distribution module, liquid crystal display, input through keyboard, D/A changes, electric current and voltage is sampled, negative feedback control loop, power circuit.
It is characterized in that described software program portion comprises: key information program, LCD display output program, sampling routine, A/D converse routine and D/A converse routine.
It is characterized in that negative feedback control loop is as core, and metal-oxide-semiconductor is the core devices of negative feedback control loop.
Composition graphs 1, Fig. 1 is the theory diagram of system.The present invention is a kind of easy to operate, powerful novel electron load design scheme.Core controller STC89C52 single-chip microcomputer and keyboard circuit, LED display circuit, DA output control circuit, A/D convertor circuit etc. is mainly comprised in circuit.The most important part of this circuit is negative feedback control loop, adopts negative feedback to have many good qualities, such as improves the stability of amplifier gain, reduce amplifier distortion, improve the signal to noise ratio (S/N ratio) etc. of amplifier.The negative feedback loop that this paper adopts changes the resistance of internal resistance by the grid voltage changing metal-oxide-semiconductor, and this is also the foundation under electronic load is operated in constant current mode.
It improve traditional method for designing, skilled applies software section function, instead of depends on hardware completely, so makes production cost reduce instantaneously, and electronic load have also been obtained good popularization.A lot of design proposals in the past all further do not develop metal-oxide-semiconductor, thus make whole circuit be difficult to manipulation.The input resistance of metal-oxide-semiconductor is large especially, be all generally mega-ohms other, be therefore easier to drive, be highly suitable for the situation controlling big current with small voltage.In the negative feedback loop of this software, metal-oxide-semiconductor is major part wherein, and the turn-on and turn-off time that strictly must control it obtains required operating voltage, electric current.The negative feedback control loop of native system just can realize the continuous change of metal-oxide-semiconductor conduction angle, improves measuring accuracy with this.
Claims (3)
1. a programmable DC electronic load device, its composition comprises software and hardware two large divisions, wherein hardware components comprise the selection of single-chip microcomputer and input/output port distribution module, liquid crystal display, input through keyboard, D/A changes, electric current and voltage is sampled, negative feedback control loop, power circuit.
2. a kind of programmable DC electronic load device according to claim 1, is characterized in that described software program portion comprises: key information program, LCD display output program, sampling routine, A/D converse routine and D/A converse routine.
3. a kind of programmable DC electronic load device according to claim 1, it is characterized in that negative feedback control loop is as core, and metal-oxide-semiconductor is the core devices of negative feedback control loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310615967.6A CN104678133A (en) | 2013-11-27 | 2013-11-27 | Programmable direct current electronic load device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310615967.6A CN104678133A (en) | 2013-11-27 | 2013-11-27 | Programmable direct current electronic load device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104678133A true CN104678133A (en) | 2015-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310615967.6A Pending CN104678133A (en) | 2013-11-27 | 2013-11-27 | Programmable direct current electronic load device |
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| CN (1) | CN104678133A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967548A (en) * | 2018-09-29 | 2020-04-07 | 株洲中车时代电气股份有限公司 | Program-controlled variable resistor device with current detection function and working method |
-
2013
- 2013-11-27 CN CN201310615967.6A patent/CN104678133A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967548A (en) * | 2018-09-29 | 2020-04-07 | 株洲中车时代电气股份有限公司 | Program-controlled variable resistor device with current detection function and working method |
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Application publication date: 20150603 |