CN204479673U - A kind of novel alternating current electronic load - Google Patents
A kind of novel alternating current electronic load Download PDFInfo
- Publication number
- CN204479673U CN204479673U CN201520123797.4U CN201520123797U CN204479673U CN 204479673 U CN204479673 U CN 204479673U CN 201520123797 U CN201520123797 U CN 201520123797U CN 204479673 U CN204479673 U CN 204479673U
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- China
- Prior art keywords
- circuit
- electrically connected
- effect transistor
- field effect
- multiplier
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Abstract
The utility model discloses a kind of novel alternating current electronic load, its load characteristic artificial circuit comprises electromagnetic interface filter, rectifier bridge, field effect transistor, PWM waveshaping circuit, multiplier, phase shifter, operational amplifier, sample circuit, input equipment, single chip machine controlling circuit, display device, only a field effect transistor is used in load characteristic artificial circuit, all control tasks are completed by software, the beneficial effects of the utility model are: the quantity greatly reducing discrete component, the integrated level not only solving prior art is low, the problem of poor reliability, and the problem that the dispersiveness solving discrete component causes voltage current waveform to be out of shape, adopt software control scheme, make full use of microcontroller, not only reduce the cost of system, improve reliability, there is the advantage being easy to upgrade.
Description
Technical field
The utility model relates to a kind of alternating current electronic load, particularly relates to a kind of alternating current electronic load using single-chip microcomputer and field effect transistor.
Background technology
In the production run of electronic equipment, a procedure is had to be exactly carried out burn-in test after assembling product has been got well, burn-in test conventional method is carried out to power supply or other high-power products and loads electronic load exactly, electronic load can load (electrical appliance) in Reality simulation environment, and some all can detect the quality of power supply or other high-power products to the producer that power requirement is stricter with electronic load.It not only can regulating load size, can also realize the state such as short circuit, overcurrent.Existing alternating current electronic load mainly contains two kinds of implementations 1: truly use reactance component, and the parameter being changed true reactance component by control circuit completes test.2: working load characteristic Simulation circuit and inversion full-bridge circuit, adopt the scheme of Reality simulation load, by the calculating to setting value, obtain tested electric power output voltage power frequency, amplitude, phase relation, by the load of power conversion circuit Reality simulation, by inversion full-bridge energy back on electrical network.By comparative analysis, the first scheme controls dumb, can retrain by reactance component by setting range, belongs to earlier technique, has been tending towards superseded.The second technical scheme belongs to modern scientist scheme, can by energy back circuit by tested power supply energy back in testing in electrical network, can economize energy, and reduce when testing and occur overheated situation.As application number is: the Chinese utility model patent of 200820163408.0 " AC electronic load device " by name just belongs to this technology.
Load characteristic artificial circuit in prior art employs 4 field effect transistor, and the grid of field effect transistor and microcontroller electrical connection, system adopts discrete component number many, the defects such as integrated level is low, poor reliability.Due to the dispersiveness of discrete component, in load characteristic artificial circuit, voltage current waveform can be out of shape, and precision can be reduced.Do not give full play to the effect of microcontroller, be not easy to upgrading, cost performance is not high.
Therefore, the problems referred to above are urgently to be resolved hurrily, need to provide that a kind of cost is low, integrated level is high, precision is high, the design proposal of intelligentized alternating current electronic load.
Summary of the invention
In order to solve the problem, the utility model discloses a kind of novel alternating current electronic load, comprise load characteristic artificial circuit and energy back part, its load characteristic artificial circuit comprises electromagnetic interface filter, rectifier bridge, field effect transistor, PWM waveshaping circuit, multiplier, phase shifter, operational amplifier, sample circuit, input equipment, single chip machine controlling circuit, display device.
Described electromagnetic interface filter is electrically connected with described rectifier bridge, described field effect transistor is connected with described PWM waveshaping circuit, described PWM waveshaping circuit is electrically connected with described multiplier, described multiplier is electrically connected with described phase shifter, described operational amplifier is electrically connected with described sample circuit, described operational amplifier is electrically connected with described multiplier, described single chip machine controlling circuit is electrically connected with described phase shifter, described single chip machine controlling circuit is electrically connected with described operational amplifier, described single chip machine controlling circuit is electrically connected with described input equipment, described single chip machine controlling circuit is electrically connected with described display device.
Only use a field effect transistor in load characteristic artificial circuit, all control tasks are completed by software.
The beneficial effects of the utility model are: load characteristic emulation only need use a field effect transistor, greatly reduce the quantity of discrete component, the integrated level not only solving prior art is low, the problem of poor reliability, and solves the dispersiveness of discrete component, the problem that voltage current waveform can be out of shape, adopt software control scheme, make full use of microcontroller, not only reduce the cost of system, improve reliability, and adopt the design proposal of software, there is the advantage being easy to upgrade.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of prior art.
Fig. 2 is the load characteristic artificial circuit composition frame chart in the utility model embodiment.
In figure: 1. load characteristic artificial circuit, 2. DC bus, 3. energy back part, 4. tested power supply, 5. utility network, 6.EMI wave filter, 7.PWM waveshaping circuit, 8. sample circuit, 9. phase shifter, 10. multiplier, 11. operational amplifiers, 12. input equipments, 13. single chip machine controlling circuits, 14. display devices.
Embodiment
In conjunction with the drawings the utility model is further described.
As shown in Figure 2, the utility model discloses a kind of novel alternating current electronic load, its load characteristic artificial circuit comprises electromagnetic interface filter, rectifier bridge, field effect transistor, PWM waveshaping circuit, multiplier, phase shifter, operational amplifier, sample circuit, input equipment, single chip machine controlling circuit, display device.
Electromagnetic interface filter is electrically connected with rectifier bridge, field effect transistor is connected with PWM waveshaping circuit, PWM waveshaping circuit is electrically connected with multiplier, multiplier is electrically connected with phase shifter, and operational amplifier is electrically connected with sample circuit, and operational amplifier is electrically connected with multiplier, single chip machine controlling circuit is electrically connected with phase shifter, single chip machine controlling circuit is electrically connected with operational amplifier, and single chip machine controlling circuit is electrically connected with input equipment, and single chip machine controlling circuit is electrically connected with display device.
Only use a field effect transistor in load characteristic artificial circuit, all control tasks are completed by software.
The output of tested power supply by electromagnetic interface filter filtering, then obtains sinusoidal half-wave voltage through rectifier bridge rectification
,
through phase shifter output voltage be
,
for an input of multiplier, electric capacity C both end voltage
after over-sampling circuit with single-chip microcomputer given voltage
difference all input as the another one of multiplier, the output of multiplier
as an input of PWM waveshaping circuit, inductance
in current detection signal
as another input of PWM waveshaping circuit.
Electric capacity C voltage
through sampling circuit samples and given voltage
make comparisons, judge that whether output voltage is identical with given voltage, if not identical, can be regulated by operational amplifier, the output of operational amplifier is a D. C. value.
amplitude and output voltage
with given voltage
difference relevant.
in current detection signal
with
the drive singal that circuit produces field effect transistor is formed through PWM.When
be less than
, field effect transistor conducting, inductive current increases, and electric energy is stored in telefault with the form of magnetic energy, and electric capacity C discharges for rear pole provides energy.When
be increased to and equal electric current
time, field effect transistor is ended, diode current flow, power supply and inductance
be in series, power, by the given different voltage of single-chip microcomputer to electric capacity C charging and rear pole
the constant of different electric current can be realized.
Single-chip microcomputer can also simulate inductive load, capacitive load, ohmic load by controlling phase shifter.Phase shifter output voltage
obviously be sinusoidal half-wave voltage, after the DC quantity that it and operational amplifier export is multiplied, waveform is constant, so
also be half-sinusoid waveform and with
homophase, controlled like this inductive current
with voltage waveform
unanimously.
When testing power supply, by input equipment, load characteristic is inputed to single-chip microcomputer, single-chip microcomputer, according to the data of input, calculates the size of current I of power supply output and the phase differential of electric current and voltage
, single-chip microcomputer makes the input voltage of multiplier by controlling phase shifter
the voltage exported with power supply
phase differential is also
, and inductive current with
same-phase, that is voltage that exports of inductive current and power supply
phase differential is also
.The size of electric current is exported by single-chip microcomputer
given, the size making electric power outputting current is I, thus achieves and for the load of any resistance, necessary information can be shown, be user-friendly to by display device.
The beneficial effects of the utility model are: circuit only need use a field effect transistor, greatly reduce the quantity of discrete component, the integrated level not only solving prior art is low, the problem of poor reliability, and solves the dispersiveness of discrete component, the problem that voltage current waveform can be out of shape, adopt software control scheme, make full use of microcontroller, not only reduce the cost of system, improve reliability, and adopt the design proposal of software, there is the advantage being easy to upgrade.
Above-described embodiment is the principle of exemplary illustration utility model and effect only; and section Example, for those skilled in the art, under the prerequisite not departing from the utility model creation design; can also make some distortion and improvement, these all belong to the utility model protection domain.
Claims (1)
1. a novel alternating current electronic load, comprise load characteristic artificial circuit and energy back part, it is characterized in that: load characteristic artificial circuit comprises EMI wave filter, rectifier bridge, field effect transistor, PWM waveshaping circuit, multiplier, phase shifter, operational amplifier, sample circuit, input equipment, single chip machine controlling circuit, display device, described EMI wave filter is electrically connected with described rectifier bridge, described field effect transistor is connected with described PWM waveshaping circuit, described PWM waveshaping circuit is electrically connected with described multiplier, described multiplier is electrically connected with described phase shifter, described operational amplifier is electrically connected with described sample circuit, described operational amplifier is electrically connected with described multiplier, described single chip machine controlling circuit is electrically connected with described phase shifter, described single chip machine controlling circuit is electrically connected with described operational amplifier, described single chip machine controlling circuit is electrically connected with described input equipment, described single chip machine controlling circuit is electrically connected with described display device, only a field effect transistor is used in load characteristic artificial circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520123797.4U CN204479673U (en) | 2015-03-03 | 2015-03-03 | A kind of novel alternating current electronic load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520123797.4U CN204479673U (en) | 2015-03-03 | 2015-03-03 | A kind of novel alternating current electronic load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204479673U true CN204479673U (en) | 2015-07-15 |
Family
ID=53635460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520123797.4U Expired - Fee Related CN204479673U (en) | 2015-03-03 | 2015-03-03 | A kind of novel alternating current electronic load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204479673U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318719A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of stepless changing purely resistive AC load |
| CN108318847A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of purely resistive AC load of automatic constant current |
-
2015
- 2015-03-03 CN CN201520123797.4U patent/CN204479673U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318719A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of stepless changing purely resistive AC load |
| CN108318847A (en) * | 2018-01-30 | 2018-07-24 | 国网上海市电力公司 | A kind of purely resistive AC load of automatic constant current |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150715 Termination date: 20170303 |