CN101324797A - Electronic load device and circuit thereof - Google Patents
Electronic load device and circuit thereof Download PDFInfo
- Publication number
- CN101324797A CN101324797A CNA2007101090452A CN200710109045A CN101324797A CN 101324797 A CN101324797 A CN 101324797A CN A2007101090452 A CNA2007101090452 A CN A2007101090452A CN 200710109045 A CN200710109045 A CN 200710109045A CN 101324797 A CN101324797 A CN 101324797A
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- signal
- amplifier
- circuit
- electronic load
- power component
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Abstract
The invention discloses an electronic load device which is used for connecting a load, and carrying out an electric load test on the load. The electronic load device comprises: a simulating conversion digital module which is used for converting a simulating signal of the load received into a digital signal; a micro-processing unit used for processing the digital signal through mathematical operation and outputting a control signal after receiving the digital signal; a digital conversion simulation module which is used for converting the received control signal into a control signal in the form of the simulating signal; and an electronic load module which comprises an electronic load circuit and is connected with the load to form a loop, wherein the electronic load module receives the control signal and generates a load current, and the load current is linear with the control signal.
Description
Technical field
The present invention is meant a kind of electronic load device and circuit thereof that power component postpones driving that improve especially about a kind of electronic load device.
Background technology
Because Power Electronic Technique constantly develops the lifting with semiconductor fabrication, makes that the utilization of power electronics class load is more prevalent, and the gesture that replaces conventional load is gradually arranged.Its principle of work of electronic load achieves the goal with the waveform of cutting or change voltage or electric current, be voltage or the current value that electronic component feeds back on circuit, the basic numerical value of proof voltage that is presented when being circuit load and electric current has the advantage of high-level efficiency and power controlling flow.The electronic load circuit is when load, and the load source that the electric current of feedback can be used influences.
See also shown in Figure 1ly, it is the synoptic diagram of a kind of electronic load circuit of prior art.The electronic load circuit includes one first amplifier OP
1, one second amplifier OP
2, a signal adds up device S, a power component and a resistance R.Wherein, the first amplifier OP
1Two input ends connect the two ends and an end points D of resistance R respectively, output terminal is connected to signal and adds up device S, signal adds up device S and connects the second amplifier OP respectively
2An input end and a terminal A, the second amplifier OP
2Output terminal be connected to the control grid of power component, the other end of power component is linked to a wherein end of resistance R, closes feedback circuit to form one.Power component can select that (IGBT:Insulated Gate Bipolar Transistors IGBT) waits element as: bipolar transistor (BJT), metal-oxide half field effect transistor (MOSFET), insulated gate bipolar transistor for use; The also available Hall element of resistance R is done a replacement, by the load current I of power component institute conducting
OProduce a voltage drop V
F
The voltage drop V that resistance R produced
FAs a feedback signal, and the first amplifier OP
1Receiving feedback signals is to produce the gain G of a feedback signal
FTerminal A receives a Control current signal V
ISignal adds up device S will receive the terminal A current potential and the first amplifier OP
1The output terminal current potential, and the current potential of terminal A deducted the first amplifier OP
1Behind the output terminal current potential, output signal to the second amplifier OP
2Input end, the second amplifier OP
2Amplifying signal with the unlatching of power controlling element whether, the unlatching by power component is whether with flow through load current I between two terminal B, the C of control
OSize.
By the first amplifier OP
1, signal adds up device S, a power component, a resistance R and the second amplifier OP
2, and utilize the Control current signal V of amplification
I, close the feedback load circuit and form one; When load circuit during in stable state, load current I
OWith load voltage (V
+-V
-) irrelevant, and with Control current signal V
ILinear.Yet, because the high-frequency gain of amplifier can be decayed, the driving voltage of these power components control grid all non-zero volt itself starts, therefore the electronic load circuit of prior art is under the situation that need start fast, to not reach trigger voltage because of the control gate pole tension of power component, cause the electronic load circuit when starting, to produce and postpone, and during this is of short duration load current I
OCan't be with Control current signal V
IMake linear a change.
Because in the electronic load circuit of prior art, will run into following difficulty: because of the characteristic of power component, under working at high speed, having blink its load current can't be with the Control current signal change.Therefore, the present invention proposes a kind of electronic load device and circuit thereof, to overcome the lag that causes because of power component non-zero volt drive characteristic.
Summary of the invention
The size of its control signal the object of the present invention is to provide a kind of electronic load device, no matter all can drive and produce a load current that meets linear relationship smoothly.
The object of the present invention is to provide a kind of electronic load circuit, postpone because of power component starts the action that critical voltage caused, make the electronic load circuit can reach the usefulness of real-time startup in order to improve in the general electronic load circuit.
The present invention discloses a kind of electronic load device, in order to connecting a loaded article, and loaded article is carried out electric power draw and carry test, and electronic load device comprises: an analog-to word modules is a digital signal with an analog signal conversion of reception loaded article; One microprocessing unit behind the receiving digital signals, is exported a control signal through calculation process; One digital revolving die is intended module, receives the control signal output that control signal transfers the simulating signal kenel to; And an electronic load module, have an electronic load circuit, be connected to loaded article and with its formation one loop, the electronic load module receives control signal, produces a load current, wherein load current and control signal are a linear relationship.
The present invention discloses a kind of electronic load circuit and comprises at least: one closes a feedback circuit and a comparer.Close feedback circuit, have one first amplifier, one second amplifier, a signal totalling device, a feedback resistance and a power component, wherein, first amplifier input terminal connects the two ends of feedback resistance, the output terminal of first amplifier connects signal and adds up device, signal adds up device and exports signal to the second amplifier input terminal, and the output terminal of second amplifier connects the control grid of power component, and an end of power component is linked to an end of feedback resistance.The comparer positive input terminal connects a reference voltage, and the value of reference voltage is the critical voltage value of driving power element, and negative input end connects the output terminal of second amplifier, and output terminal connects signal and adds up device.
When the electronic load circuit receives the driving voltage of a control signal less than power component, comparer will be exported the state that output potential that a voltage improves second amplifier makes power component start in preparation, and then control signal can drive the electronic load circuit; When the electronic load circuit receives the driving voltage of a control signal greater than power component, comparer will be exported 0 voltage, and control signal still can drive the electronic load circuit smoothly.
Description of drawings
Fig. 1 is the synoptic diagram of the electronic load circuit of prior art;
Fig. 2 connects the synoptic diagram of a loaded article for one embodiment of the invention electronic load device;
Fig. 3 is the synoptic diagram of one embodiment of the invention electronic load circuit; And
Fig. 4 is the circuit diagram of another embodiment of the present invention electronic load circuit.
Drawing reference numeral:
20 electronic load devices
22 loaded articles
202 analog-to word modules
204 microprocessing units
206 digital revolving dies are intended module
208 electronic load modules
I
OLoad current
M
1Nmos pass transistor
OP
1First amplifier
OP
2Second amplifier
OP
3The 3rd amplifier
R
XVariable resistor
The S signal adds up device
U
1Comparer
V
THDrive (critical) voltage
V
FFeedback voltage
V
IThe Control current signal
ZD
1Zener diode
C
1, C
2Electric capacity
I
OFF, I
REFReference current
R
1～R
13, R resistance
V
DD, V
SS, V
REFReference voltage
Embodiment
For power component control grid in the electronic load modular circuit of improving existing electronic load device (or is called critical voltage V not reaching driving voltage
TH) in, the problem that power component can't react; The present invention increases by a comparator circuit in the electronic load modular circuit, the output that makes amplifier is not before reaching power component driving (startup) voltage, comparer will produce a voltage increases the output resume of amplifier, after the output of amplifier reaches the control critical grid voltage, then comparer is output as zero and no longer increase the output of amplifier, this Control current signal will be linear with load current if input end receives a Control current signal this moment.
See also shown in Figure 2ly, it connects the synoptic diagram of a loaded article for one embodiment of the invention electronic load device.Electronic load device 20 connects a loaded article 22, loaded article is carried out electric power draw a year test, with the proof voltage of sensing lead thing 22 and the basic numerical value of electric current; Wherein, electronic load device 20 comprises an analog-to word modules 202, a microprocessing unit 204, one a digital revolving die plan module 206 and an electronic load module 208.
Wherein, analog-to word modules 202 connects loaded articles 22, and is that a digital signal exports microprocessing unit 204 to the analog signal conversion of reception loaded article; Behind microprocessing unit 204 receiving digital signals, control signal to digital revolving die through calculation process output one and intend module 206; The control signal that numeral revolving die plan module 206 reception control signals transfer the simulating signal kenel to exports electronic load module 208 to; Electronic load module 208 has an electronic load circuit, be connected to loaded article and with its formation one loop, the electronic load module receives control signal, it is linear to produce a load current and control signal.Wherein, the action principle of electronic load circuit, enforcement aspect will be elaborated as follows.
See also shown in Figure 3ly, it is the synoptic diagram of one embodiment of the invention electronic load circuit.The electronic load circuit includes one first amplifier OP
1, one second amplifier OP
2, a comparer U
1, a signal adds up device S, a power component and a resistance R.Wherein, the first amplifier OP
1Two input ends connect the two ends and an end points D of resistance R respectively, output terminal is connected to signal and adds up device S; Signal adds up device S and connects the second amplifier OP again respectively
2An input end and a terminal A; The second amplifier OP
2Output terminal be connected to the control grid and the comparer U of power component
1Negative input end; The other end of power component is linked to a wherein end of resistance R, closes feedback circuit to form one; Comparer U
1Positive input terminal connect the critical voltage value V of a driving power element
TH, comparer U
1Output terminal be connected to signal and add up device S.
Power component can be selected for use as bipolar transistor (BJT), metal-oxide half field effect transistor (MOSFET), insulated gate bipolar transistor elements such as (IGBT:Insulated Gate Bipolar Transistors); Resistance R is by the load current I of power component institute conducting
OProduce a voltage drop V
F, also available Hall element and resistance R are done a replacement.
The voltage drop V that resistance R produced
FAs a feedback signal, make the first amplifier OP
1Receiving feedback signals and reference voltage V
REFTo produce the gain G of a feedback signal
FTerminal A receives a Control current signal V
ISignal adds up device S and receives terminal A current potential, the first amplifier OP
1Output terminal current potential and comparer U
1Output potential, and the current potential of terminal A added comparer U
1Output potential deduct the first amplifier OP
1Behind the output potential, output signal to the second amplifier OP
2Input end, the second amplifier OP
2Amplifying signal is to comparer U
1The control grid of negative input end and power component.
As Control current signal V
ILess than power component trigger voltage V
THThe time, existing electronic load circuit will be owing to the second amplifier OP
2Output voltage values do not reach power component trigger voltage V
TH, and can't open the control grid of power component, and make load current I
OCan't be with Control current signal V
IChange.
Yet the present invention is by comparer U
1Circuit produces a voltage in advance and exports the second amplifier OP to
2Input end, make the second amplifier OP
2Output voltage values continue to increase, up to the second amplifier OP
2Output voltage values reach control critical grid voltage V
THAfter, comparer U then
1Be output as zero and no longer increase by the second amplifier OP
2Output voltage values, therefore, even Control current signal V
ILess than power component trigger voltage V
TH, still can the driving power element, the unlatching by power component with control flow through two terminal B, C between load current I
OSize makes Control current signal V
IWith load current I
OLinear, and the situation that does not have a delay takes place.
As Control current signal V
IGreater than power component trigger voltage V
TH, comparer U then
1To be failure to actuate to make is output as zero, and Control current signal V
IAdd up the device S and the second amplifier OP through signal
2After, the driving power element makes Control current signal V smoothly
IWith load current I
OLinear, and the situation that does not have a delay takes place.
See also shown in Figure 4ly, be the circuit diagram of a kind of electronic load circuit of another embodiment of the present invention.The electronic load circuit includes one first amplifier OP
1, one second amplifier OP
2, one the 3rd amplifier OP
3, a comparer U
1, a transistor M
1, a plurality of electric capacity and a plurality of resistance.Wherein, the first amplifier OP
1Positive input terminal connect transistor M
1An end, negative input end connects two resistance R
9With R
10An end, the first amplifier OP
1Output terminal connect resistance R
9The other end and a feedback resistance R
8An end, resistance R
10The other end connect a reference voltage V
SS
The second amplifier OP
2Two input ends connect a reference voltage V respectively
SSAnd resistance R
4With feedback resistance R
8The other end, the second amplifier OP
2Output terminal connect a resistance R
5With comparer U
1Positive input terminal, resistance R
5Be connected to transistor M
1Grid, the second amplifier OP
2Via resistance R
5The output amplifying signal is with oxide-semiconductor control transistors M
1Unlatching whether.
The 3rd amplifier OP
3Two input ends connect a reference voltage V respectively
SSAnd resistance R
1, R
2With R
6An end be connected, its output terminal couples the second amplifier OP again
2The input end and the first amplifier OP
1Output terminal; Wherein, the 3rd amplifier OP
3As a totalizer, reaching the effect that a signal adds up device S, in order to resistance R
1, R
2With R
7Result after the current potential of three ends is added and subtracted mutually adds the first amplifier OP
1Output signal after, the feed-in second amplifier OP
2Input end.
Comparer U
1Negative input end connect a voltage regulator circuit 1, in order to a reference voltage V to be provided
TH(transistor M
1The critical voltage of control grid), voltage regulator circuit 1 is by an electricity group R
12The circuit in parallel of connecting, parallel circuit is by a capacitor C
2Two resistance in series R in parallel
XWith R
11An and Zener diode ZD in parallel
1Form, wherein, resistance R
xBe a variable resistor,, adjust different critical voltage values so can adapt to the different driving transistor; Comparer U
1Output terminal connect two resistance R
6With R
7, via resistance R
6Output potential signal to the three amplifier OP
3
Utilize the second amplifier OP
2As driving transistors M in the electronic load
1The operational amplifier of pulling load current makes the enlargement ratio of direct current very big with the form of integrator, the second amplifier OP
2Output as comparer U
1Negative input and comparer U
1The reference voltage V of positive input terminal
THMake comparisons, again by the 3rd amplifier OP
3Do totalizer, to keep transistor M
1Remain in the state opened of being about to before carrying drawing.
As Control current signal V
ILess than power component trigger voltage V
THThe time, because the electronic load circuit has made transistor M
1Remain in the state that is about to unlatching, even if Control current signal V
IToo little and can't driving transistors M in existing electronic load circuit
1, but in electronic load circuit of the present invention, because transistor M
1Remain in the state opened of being about to before carrying drawing, so Control current signal V
IDriving transistors M smoothly
1, make it and load current I
OLinear.
Above-mentioned comparator circuit after comparing the current potential of positive-negative input end, produces a voltage in advance and exports the 3rd amplifier OP to
3Input end, make the 3rd amplifier OP
3Output voltage values increase and export the second amplifier OP to
2, the second amplifier OP
2It is received current potential do amplification, as the second amplifier OP
2Output voltage values reach control critical grid voltage V
THAfter, comparer U then
1Be output as zero and no longer influence the 3rd amplifier OP
3The output potential value.
In the above-described embodiments, can reduce the time delay that driving transistors reaches starting state, and have the following advantages:
1. do not influence original designed electronic load circuit characteristic; Because comparator circuit acts on the cut-off region of power component, and input impedance is very big, so do not have influence for the control of original closed loop.
2. the reference voltage tool of comparer is adjusted function in the electronic load circuit, can adapt to the power component of different trigger voltages.
3. the electronic load circuit material cheaply and simply is easy to safeguard.
4. general electronic load all forms the electronic load module in the mode of the above-mentioned electronic load circuit of parallel connection for increasing power load; Because the control critical grid voltage V of each power component (transistor)
THNeither with, so be head it off, control grid critical voltage difference can be picked out apart from little power component, perhaps organize voltage regulator circuit and all adjust reference voltage and deal with in artificial mode at each, can reach the consistance of drawing simultaneously year like this.
Though the present invention illustrates as above with preferred embodiment, so it is not in order to limit spirit of the present invention and invention entity.Usually know the knowledgeable to having in the affiliated technical field, when understanding and utilize other element or mode to produce identical effect easily.Be with, the modification of being done in without departing from the spirit or scope of the invention all should be included in the claim scope.
Claims (10)
1. electronic load circuit, described circuit comprises at least:
One closes feedback circuit, have one first amplifier, one second amplifier, a signal totalling device, a feedback resistance and a power component, wherein, described first amplifier input terminal connects the two ends of described feedback resistance, the output terminal of described first amplifier connects described signal and adds up device, described signal adds up device and exports a signal to described second amplifier input terminal, the output terminal of described second amplifier connects the control grid of described power component, and an end of described power component is linked to an end of described feedback resistance; And
One comparer, positive input terminal connect a reference voltage, and the value of described reference voltage is the driving voltage value of described power component, and negative input end connects the output terminal of described second amplifier, and output terminal connects described signal and adds up device,
Wherein, when adding up device, described signal receives the driving voltage of a control signal less than described power component, described comparer will be exported the state that output potential that a voltage improves described second amplifier makes described power component start in preparation, and then described control signal can drive described electronic load circuit; Receive the driving voltage of a control signal greater than described power component when described signal adds up device, described comparer will be exported 0 voltage, and described control signal can drive described electronic load circuit smoothly.
2. circuit according to claim 1 is characterized in that, described power component can be bipolar transistor, metal-oxide half field effect transistor, insulated gate bipolar transistor and similar power component.
3. circuit according to claim 1 is characterized in that described feedback resistance can be replaced with Hall element.
4. circuit according to claim 1 is characterized in that, described reference voltage is provided by a regulation voltage circuit.
5. circuit according to claim 1 is characterized in that, described signal adds up device and can reach with the totalizer that one the 3rd amplifier is made.
6. electronic load device in order to connecting a loaded article, and carries out electric power for described loaded article and draws and carry test, and described electronic load device comprises:
One analog-to word modules is a digital signal with an analog signal conversion of the described loaded article of receive;
One microprocessing unit, receive described digital signal after, export a control signal through calculation process;
One digital revolving die is intended module, receives the described control signal output that described control signal transfers the simulating signal kenel to; And
One electronic load module has an electronic load circuit, is connected to described loaded article, and with its formation one loop,
Described electronic load module receives described control signal, produces a load current, and wherein said load current and described control signal are a linear relationship.
7. device according to claim 6, it is characterized in that, described electronic load circuit has the feedback circuit of closing and a comparer, wherein said comparer positive input terminal connects a reference voltage, negative input end connects described output of closing feedback circuit, and output terminal connects described input of closing feedback circuit; When the described feedback circuit that closes receives described control signal less than described reference voltage, described comparer will be exported a voltage to improve the described output potential that closes feedback circuit, make described control signal can drive described electronic load circuit; When the described feedback circuit that closes receives described control signal greater than described reference voltage, described comparer will be exported 0 voltage, and described control signal drives described electronic load circuit.
8. device according to claim 6, it is characterized in that, the described feedback circuit that closes has one first amplifier, one second amplifier, one signal adds up device, one feedback resistance and a power component, described first amplifier input terminal connects the two ends of described feedback resistance, the output terminal of described first amplifier connects described signal and adds up device, described signal adds up the voltage that device receives described comparer output, described signal adds up device and exports a signal to described second amplifier input terminal, the output terminal of described second amplifier connects the control grid of described power component and the negative input end of described comparer, and an end of described power component is linked to an end of described feedback resistance.
9. device according to claim 6 is characterized in that, described reference voltage is the driving voltage value of described power component.
10. device according to claim 6 is characterized in that described reference voltage is produced by a voltage regulator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101090452A CN101324797B (en) | 2007-06-15 | 2007-06-15 | Electronic load device and circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101090452A CN101324797B (en) | 2007-06-15 | 2007-06-15 | Electronic load device and circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101324797A true CN101324797A (en) | 2008-12-17 |
| CN101324797B CN101324797B (en) | 2010-06-02 |
Family
ID=40188362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101090452A Active CN101324797B (en) | 2007-06-15 | 2007-06-15 | Electronic load device and circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101324797B (en) |
Cited By (8)
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| CN102353823A (en) * | 2011-06-11 | 2012-02-15 | 东莞市创锐电子技术有限公司 | Electronic load of a semi-passive type programmable simulation LED characteristic |
| CN102353822A (en) * | 2011-06-11 | 2012-02-15 | 东莞市创锐电子技术有限公司 | Fully-passive programmable LED (Light-Emitting Diode) characteristic emulation electronic load |
| CN103383439A (en) * | 2013-06-24 | 2013-11-06 | 吴锦来 | Electronic load precise dual-temperature correction method and circuit |
| CN104360291A (en) * | 2014-12-04 | 2015-02-18 | 艾德克斯电子（南京）有限公司 | Electronic load device for testing LED (Light Emitting Diode) driving power supply and test method thereof |
| CN105717463A (en) * | 2012-06-21 | 2016-06-29 | 九尊城网络科技（深圳）有限公司 | Power supply load test apparatus |
| CN107884606A (en) * | 2017-12-15 | 2018-04-06 | 安阳普莱电子照明有限公司 | A kind of electronic load device and the method using electronic load device Test driver |
| CN108241079A (en) * | 2016-12-23 | 2018-07-03 | 艾德克斯电子（南京）有限公司 | Electronic load system and parallel operation method |
| CN113189512A (en) * | 2020-01-14 | 2021-07-30 | 致茂电子(苏州)有限公司 | Electronic load device |
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| JP2005123426A (en) * | 2003-10-17 | 2005-05-12 | Matsushita Electric Ind Co Ltd | Voltage-controlled variable capacitor |
| CN1859001B (en) * | 2006-03-01 | 2010-05-12 | 华为技术有限公司 | DC power slow start circuit |
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| CN102353823A (en) * | 2011-06-11 | 2012-02-15 | 东莞市创锐电子技术有限公司 | Electronic load of a semi-passive type programmable simulation LED characteristic |
| CN102353822A (en) * | 2011-06-11 | 2012-02-15 | 东莞市创锐电子技术有限公司 | Fully-passive programmable LED (Light-Emitting Diode) characteristic emulation electronic load |
| CN102353822B (en) * | 2011-06-11 | 2014-12-03 | 东莞市创锐电子技术有限公司 | Fully-passive programmable LED (Light-Emitting Diode) characteristic emulation electronic load |
| CN102353823B (en) * | 2011-06-11 | 2015-08-05 | 东莞市创锐电子技术有限公司 | A kind of electronic load of semi-passive programmable simulation LED characteristic |
| CN105717463B (en) * | 2012-06-21 | 2018-08-17 | 东莞市输变电工程公司 | Power source loads test device |
| CN105717463A (en) * | 2012-06-21 | 2016-06-29 | 九尊城网络科技（深圳）有限公司 | Power supply load test apparatus |
| CN103383439B (en) * | 2013-06-24 | 2015-12-23 | 吴锦来 | A kind of accurate dual-temperature modification method of electronic load and circuit |
| CN103383439A (en) * | 2013-06-24 | 2013-11-06 | 吴锦来 | Electronic load precise dual-temperature correction method and circuit |
| CN104360291A (en) * | 2014-12-04 | 2015-02-18 | 艾德克斯电子（南京）有限公司 | Electronic load device for testing LED (Light Emitting Diode) driving power supply and test method thereof |
| CN108241079A (en) * | 2016-12-23 | 2018-07-03 | 艾德克斯电子（南京）有限公司 | Electronic load system and parallel operation method |
| CN108241079B (en) * | 2016-12-23 | 2020-06-05 | 艾德克斯电子（南京）有限公司 | Electronic load system and parallel operation method |
| CN107884606A (en) * | 2017-12-15 | 2018-04-06 | 安阳普莱电子照明有限公司 | A kind of electronic load device and the method using electronic load device Test driver |
| CN113189512A (en) * | 2020-01-14 | 2021-07-30 | 致茂电子(苏州)有限公司 | Electronic load device |
| CN113189512B (en) * | 2020-01-14 | 2023-08-01 | 致茂电子(苏州)有限公司 | Electronic load device |
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|---|---|
| CN101324797B (en) | 2010-06-02 |
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