CN1274088A - DC electronic load simulator - Google Patents
DC electronic load simulator Download PDFInfo
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- CN1274088A CN1274088A CN 99107415 CN99107415A CN1274088A CN 1274088 A CN1274088 A CN 1274088A CN 99107415 CN99107415 CN 99107415 CN 99107415 A CN99107415 A CN 99107415A CN 1274088 A CN1274088 A CN 1274088A
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Abstract
A DC electronic load similator has positive and negative input control circuits. The positive output of a bipolar DC power supply is connected to the positive input of said simulator, its common output to the common input of the latter, and its negative output to the negative input of the latter. Said structure can be connected with more power supplies with different output polarities at same time without isolation. Only one power supply is needed for saving elements and space.
Description
The invention relates to a kind of DC electronic load simulator, be meant a kind of DC power supply that can connect the output of a plurality of opposed polarities simultaneously especially, and but do not need each electronic load all to make isolation processing, only need the DC electronic load simulator of one group of working power.
Generally in the various electronic equipments and opertaing device of use, the power supply unit that its inside disposed often need possess the output of positive supply and negative supply simultaneously, can supply this electronic equipment or opertaing device required working power in present institute.For example in typical computer equipment, the DC power supply that its inside disposed, generally promptly include+5V ,-5V ,+12V ,-12V or+5V ,-5V ,+12V ,-out-put supply of 12V, 3.3V.Again for example in general analogous circuit employed out-put supply include+12V ,-12V and+15V, and-15V etc.
Because this power supply unit has been undertaken the important task of supplies electrons equipment and the required working power of opertaing device, so its stability aspect electrical specification, reliability, output capacity, specification etc. are all very important.Therefore, no matter this power supply supply is to reach each stage of maintenance in the future in the process of producing, testing process, all be necessary to carry out the test of every electrical specification.
Generally when the electrical specification of test one direct current power supply unit, except the electrical load that can connect a reality is tested, can also simulate this actual loading by a direct current electronic load simulator, verify whether the electrical specification such as output capacity, specification of this power supply unit meets desired standard.
Employed DC electronic load simulator is unipolar independent load in conventional art, is applicable to that the positive polarity out-put supply uses, and Fig. 1 shows its binding synoptic diagram when test.It is with the electrode input end of the cathode output end of positive polarity DC power supply 1a+be connected in DC electronic load simulator 2+, and with common output end COM be connected in the negative input of DC electronic load simulator 2-.
If when the test of negative polarity out-put supply, then need with the common output end COM of this negative polarity DC power supply 1b be connected in the electrode input end of this DC electronic load simulator 2+, and with the negative input of this DC electronic load simulator 2 of cathode output end-be connected in-.
And during for the test of a bipolarity DC power supply, conventional art be directly with the electrode input end of the cathode output end of this bipolarity DC power supply 1c+be connected in first DC electronic load simulator 2a+, and with common output end COM be connected in the negative input of this DC electronic load simulator 2a-.Simultaneously, the common output end COM of this bipolarity out-put supply 1c be connected in the electrode input end of second DC electronic load simulator 2b+, and with the negative input of cathode output end-be connected in this DC electronic load simulator 2b-.
But connected mode with above-mentioned conventional art, when desire is tested the bipolarity DC power supply, each electronic load device must be isolated with being, otherwise can cause the loop between two unipolar DC electronic loads, and can not normally carry out the work of simulation.The control signal of this electronic load also need be isolated, and can carry out control.In addition, the test structure that this is traditional also needs independently power supply, that is needs two groups of working powers, is supplied to two electronic load simulators respectively.
Therefore, fundamental purpose of the present invention provides a kind of DC electronic load simulator, and it can connect a plurality of opposed polarity output DCs source supply simultaneously, but does not need each load all to make isolation processing, only needs one group of power supply to get final product simultaneously.
Purpose of the present invention can realize by following three kinds of modes based on same design ground:
1, a kind of DC electronic load simulator includes a positive polarity input control circuit and a negativity input control circuit, and wherein this positive polarity input control circuit includes a numeral to analogy converter, in order to produce a load current setting value; One first operational amplifier, its inverting input are to connect to receive the load current setting value that this numeral to analogy converter is exported; One N channel power metal oxide field effect transistor element, its conducting state controlled stage is controlled by this first operational amplifier; One load current sensing element is connected with this N channel power metal oxide field effect transistor element, in order to detect the load current size; One second operational amplifier, in parallel and in order to detecting and to amplify the load current size that this load current sensing element is detected, its output produces one and feedbacks actual current value and deliver to the inverting input of this first operational amplifier as feedback signal; And this negative polarity input control circuit includes: a numeral is to analogy converter, in order to produce a load current setting value; One negative circuit connects and in order to give this load current setting value anti-phase; One the 3rd operational amplifier, its inverting input are in order to receive the output signal of this negative circuit output terminal; One P channel power metal oxide field effect transistor element, its conducting state controlled stage is controlled by the 3rd operational amplifier; One load current sensing element is connected with this P channel power metal oxide field effect transistor element, in order to detect the load current size; One four-operational amplifier, in parallel in order to detecting and to amplify the load current size that this load current sensing element is detected, its output also produces one and feedbacks actual current value and deliver to the inverting input of the 3rd operational amplifier as feedback signal; When connecting, it is the electrode input end that the cathode output end of a bipolarity DC power supply is directly connected in this DC electronic load simulator, and common output end is connected in the common input end of this DC electronic load simulator, the cathode output end of bipolarity DC power supply then is the negative input that is directly connected in DC electronic load simulator.
2, a kind of DC electronic load simulator, comprise many group positive polarity input control circuits and organize the negative polarity input control circuit more, wherein each group positive polarity input control circuit includes: a numeral is to analogy converter, in order to produce a load current setting value; One first operational amplifier; One N channel power metal oxide field effect transistor element, its conducting state controlled stage is controlled by this first operational amplifier; One load current sensing element is connected with this N channel power metal oxide field effect transistor element, in order to detect the load current size; One second operational amplifier, in parallel and in order to detecting and to amplify the load current size that this load current sensing element is detected, its output produces one and feedbacks actual current value and connect and delivers to the inverting input of this first operational amplifier as feedback signal; The inverting input of wherein respectively organizing first operational amplifier of positive polarity input control die set is the output terminal that is connected to an error operational amplifier jointly, the inverting input of error operational amplifier then is to be connected in the output terminal of this numeral to analogy converter, to receive this load current setting value; And the output terminal of respectively organizing second operational amplifier of positive polarity input control die set is the normal phase input end that is connected to a load current totalizer jointly, and the output voltage that output terminal produced of load current totalizer is then delivered to the inverting input of error operational amplifier; Include and respectively organize the negative polarity input control circuit: a numeral is to analogy converter, in order to produce a load current setting value; One the 3rd operational amplifier; One P channel power metal oxide field effect transistor element, its conducting state controlled stage is controlled by the 3rd operational amplifier; One load current sensing element is connected with this P channel power metal oxide field effect transistor element, in order to detect the load current size; One four-operational amplifier, in parallel and the load current size that element detected in order to detect and to amplify this load current sensing, its output also produces one and feedbacks actual current value and deliver to the inverting input of the 3rd operational amplifier as feedback signal; The inverting input of wherein respectively organizing the 3rd operational amplifier of negative polarity input control die set is the output terminal that is connected to a negative circuit jointly, the inverting input of this negative circuit then is connected in the output terminal of an error operational amplifier, the inverting input of error operational amplifier then is to be connected in the output terminal of this numeral to analogy converter, to receive this load current setting value; And the output terminal of respectively organizing the four-operational amplifier of negative polarity input control die set is the inverting input that is connected to a negative circuit jointly, the output terminal of this negative circuit then is the inverting input that is connected to a load current totalizer, and the output voltage that output terminal produced of load current totalizer is then delivered to the inverting input of error operational amplifier; When connecting, it is the electrode input end that the cathode output end of a bipolarity DC power supply is directly connected in this DC electronic load simulator, and common output end is connected in the common input end of this DC electronic load simulator, the cathode output end of bipolarity DC power supply then is the negative input that is directly connected in DC electronic load simulator.
3, a kind of DC electronic load simulator comprises a negative polarity input control circuit, and this negative polarity input control circuit includes: a numeral is to analogy converter, in order to produce a load current setting value; One negative circuit connects numeral to analogy converter, in order to give this load current setting value anti-phase; One the 3rd operational amplifier, its inverting input are to connect in order to receive the output signal of this negative circuit output terminal; One P channel power metal oxide field effect transistor element, its conducting state controlled stage is controlled by the 3rd operational amplifier; One load current sensing element is connected with this P channel power metal oxide field effect transistor element, in order to detect the load current size; One four-operational amplifier, in parallel and in order to detecting and to amplify the load current size that this load current sensing element is detected, its output also produces one and feedbacks actual current value and deliver to the inverting input of the 3rd operational amplifier as feedback signal.
With circuit shelf structure of the present invention, can reduce required element of circuit and space in the DC electronic load simulator, be easy to connect and use, and can reduce cost.
Other purpose of the present invention and design thereof will be described in detail by following examples and the attached accompanying drawing that is, wherein:
Description of drawings:
Fig. 1 shows in the conventional art, is connected in the connection diagram of a positive polarity power supply device with a unipolarity DC electronic load simulator;
Fig. 2 shows in the conventional art, is connected in the connection diagram of a negative polarity power supply device with a unipolarity DC electronic load simulator;
Fig. 3 shows in the conventional art, is connected in the connection diagram of a bipolarity power supply device with two unipolarity DC electronic load simulators;
Fig. 4 is the connection diagram that bipolarity DC electronic load simulator of the present invention is connected in a bipolarity power supply device;
Fig. 5 is the positive polarity input control circuit figure of DC electronic load simulator of the present invention;
Fig. 6 is the negative polarity input control circuit figure of DC electronic load simulator of the present invention;
Fig. 7 is with two positive polarity input control die set circuit diagrams that constitute a DC load analogue means in parallel in the second embodiment of the invention;
Fig. 8 is with two negative polarity input control die set circuit diagrams that constitute a DC load analogue means in parallel in the second embodiment of the present invention.
See also shown in Figure 4ly, it is to show that bipolarity DC electronic load simulator 3 of the present invention is connected in the connection diagram of a bipolarity DC power supply 1c.It is with the cathode output end of bipolarity DC power supply 1c+be directly connected in DC electronic load simulator 3 of the present invention just reach input end+, and common output end COM is connected in the common input end COM of this DC electronic load simulator 3, the negative input that the cathode output end of bipolarity DC power supply 3-then be is directly connected in DC electronic load simulator 3 of the present invention-.
Fig. 5 is the positive polarity input control circuit figure of DC electronic load simulator of the present invention, and it mainly includes a numeral to analogy converter 31, one first operational amplifier 32, a N channel power metal oxide field effect transistor element 33 (N-MOSFET), a load current sensing element 34, one second operational amplifier 35.Wherein this first operational amplifier 32, N channel power metal oxide field effect transistor element 33, load current sensing element 34, second operational amplifier 35 have constituted positive polarity input control die set 3a jointly.Wherein first operational amplifier 32 is as driving circuit, and second operational amplifier 35 is as the current differential amplifier.
This numeral to analogy converter 31 is that (D0～D7) transfers a load current setting value Va1 in order to the digital signal that will set load current.This load current setting value Va1 deliver to the inverting input of first operational amplifier 32-, and can produce the conducting state that a drive signal is controlled this N channel power metal oxide field effect transistor element 33 at its output terminal by first operational amplifier 32.When these N channel power metal oxide field effect transistor element 33 conductings, the big I of its load current value IL is detected by a load current sensing element 34 (a for example resistance) and second operational amplifier 35 and is amplified.The current differential signal that output terminal produced of second operational amplifier 35 deliver to again the inverting input of aforementioned first operational amplifier 32-, as feedbacking actual current value Va2.When load current setting value Va1 changes (for example 0 to-10V), then can be under the control of aforementioned circuit, load end obtain a forward load current (for example 0 to+1max).
Fig. 6 is the negative polarity input control circuit figure of DC electronic load simulator of the present invention, and it mainly includes a numeral to analogy converter 41, one the 3rd operational amplifier 42, a negative circuit 42a, a P channel power metal oxide field effect transistor element 43 (P-MOSFET), a load current sensing element 44, a four-operational amplifier 45, electric current back coupling negative circuit.Wherein the 3rd operational amplifier 42, P channel power metal oxide field effect transistor element 43, load current sensing element 44, four-operational amplifier 45 have constituted negative polarity input control die set 4a jointly.Wherein the 3rd operational amplifier 42 is as driving circuit, and four-operational amplifier 45 is as the current differential amplifier.
This numeral to class is that (D0～D7) transfers a load current setting value Vb1 in order to the digital signal that will set load current through converter 41, this setting value via a negative circuit 42a deliver to the inverting input of the 3rd operational amplifier 42-, and can produce the conducting state that a drive signal is controlled this P channel power metal oxide field effect transistor element 43 at its output terminal by the 3rd operational amplifier 42.When these P channel power metal oxide field effect transistor element 43 conductings, the big I of its load current value IL is detected by a load current sensing element 44 (a for example resistance) and four-operational amplifier 45 and is amplified, its the current differential signal that output terminal produced deliver to again the inverting input of aforementioned the 3rd operational amplifier 42-, as feedbacking actual current value vb2.When load current setting value vb1 changes (for example 0 to-10V), then can be under the control of aforementioned circuit, load end obtain a negative sense load current (for example 0 to-1max).
By above embodiment of the invention circuit as can be known, the control circuit of Fig. 5 and Fig. 6 all can use same working power, and does not need the working power of independent isolating.Circuit framework of the present invention can reduce required element of circuit and space in the DC electronic load simulator, is easy to connect use, and can reduces cost.And aspect extendibility, can be extended for the binding of the electronic load simulator of more groups of positive polaritys or negative polarity with framework of the present invention, to be fit to be applied in the testing requirement of multigroup output power supply device.
Among aforesaid first embodiment, shown in Figure 5 is to constitute a positive polarity DC electronic load with single group of positive polarity input control die set 3a.When the application of reality, also can several identical positive polaritys in parallel import control die set, increase its load current.For example Fig. 7 promptly shows the circuit diagram of the DC load analogue means that is constituted with two positive polarity input control die set 3a, 3b parallel connections in the second embodiment of the present invention.At this embodiment, the size of its total load current is the summation of IL1 and IL2, because the internals of these two modules is identical, so first module sign element number therein only.
Among Fig. 7, the inverting input of first operational amplifier 32 of first group of positive polarity input control die set 3a and second group of positive polarity input control die set 3b-be the output terminal that is connected to an error operational amplifier 36 jointly, the inverting input of error operational amplifier 36-then be to be connected in the output terminal of numeral, to receive its output voltage to analogy converter 31.
In addition, this first group of positive polarity input control die set 3a and second group of positive polarity import the output terminal of second operational amplifier 35 of control die set 3b be the normal phase input end that is connected to load current totalizer 37 jointly+.The output voltage that output terminal produced of load current totalizer 37 then deliver to the inverting input of error operational amplifier 36-.
(D0～D7) transfers the load current setting value vc1 of 0～10V to numeral with the digital signal of the positive polarity load current that sets to analogy converter 31, when back coupling actual current value vc2 that this value is feedback greater than load current totalizer 37, the output voltage of error operational amplifier 36 output terminals can become negative, after first operational amplifier 32, the voltage VC1 change of output terminal is just increased, therefore make first group of positive polarity input control die set 3a and the 33 more conductings of second group of positive polarity input control die set 3b N channel power metal oxide field effect transistor element, load current IL1 and IL2 are increased, that is total current increase.
After load current IL1 and IL2 increase, the output of second operational amplifier of win group positive polarity input control die set 3a and second group of positive polarity input control die set 3b is increased, after load current totalizer 37 is with IL1 and IL2 addition, make the back coupling actual current value Vc2 of these load current totalizer 37 output terminals become negative increase.So, when the value of this load current setting value vc1 and back coupling actual current value Vc2 reaches balance, promptly make the actual total current that exports load to promptly equal the digital load current value that sets to the input end D0～D7 of analogy converter 31.
Similarly, shown in Figure 6 is to constitute a negative polarity DC electronic load with single group of negative polarity input control die set 4a.When the application of reality, also can several identical negative polarity in parallel import control die set, increase its load current.For example Fig. 8 promptly shows the circuit diagram of the DC load analogue means that is constituted with two negative polarity input control die set 4a, 4b parallel connections in the second embodiment of the present invention.At this embodiment, the size of its total load current is the summation of IL1 and IL2.
Among Fig. 8, the inverting input of the 3rd operational amplifier 42 of first group of negative polarity input control die set 4a and second group of negative polarity input control die set 4b-be the common output terminal that is connected to an error operational amplifier 46 through a negative circuit 42a, the inverting input of error operational amplifier 46-then be to be connected in the output terminal of numeral, to receive its output voltage to analogy converter 41.
In addition, this first group of negative polarity input control die set 4a and second group of negative polarity import the output terminal of the four-operational amplifier 45 of control die set 4b be the inverting input that is connected to load current totalizer 47 jointly-.And the output terminal of load current totalizer 47, give through a negative circuit 47a anti-phase, again the output valve that this negative circuit 47a output terminal is produced deliver to the inverting input of error operational amplifier 46-.
Shown in Figure 8, the load current setting value Vd1 that sets to analogy converter 41 input end D0～D7 when numeral is when feedbacking actual current value vd2, the output of error operational amplifier 46 becomes Reduction of Students' Study Load, behind negative circuit 42a, its output valve is become to be increased, through after the 3rd operational amplifier 42, the output voltage V G1 and the VG2 change of the 3rd operational amplifier 42 of this first group of positive polarity input control die set 3a and second group of positive polarity input control die set 3b are born again.Therefore make the 43 more conductings of P channel power metal oxide field effect transistor element, cause electric current I L1 and IL2 to increase, even also total current increases.
After the load current IL2 increase of the load current IL1 of this first group anodal input control die set 3a and second group of positive polarity input control die set 3b, the output of four-operational amplifier 45 is increased toward negative value, adduction is anti-phase mutually with IL2 with IL1 through load current totalizer 46, so make the output valve of this load current totalizer 46 past on the occasion of increase, make its signal inversion through phase inverter 47a again, make the output of error operational amplifier 46 reach balance at last, make the actual loading electric current equal the load current value that numeral sets to analogy converter 41 input end D0～D7.
In sum, DC electronic load simulator provided by the present invention, the true practical value of tool height, and also meet the novelty and the progressive important document of defined in the Patent Law, so propose the application of patent in accordance with the law.
Claims (3)
1, a kind of DC electronic load simulator includes a positive polarity input control circuit and a negativity input control circuit, it is characterized in that this positive polarity input control circuit includes: with the numeral that produces the load current setting value to analogy converter; One first operational amplifier, its inverting input are to connect the load current setting value that this numeral to analogy converter is exported; One N channel power metal oxide field effect transistor element, its conducting state control utmost point is by this first control that operational amplifier connects; One load current sensing element is connected with this N channel power metal oxide field effect transistor element; One second operational amplifier, this load current sensing element in parallel, its output produces a back coupling actual current value and connects the inverting input of this first operational amplifier as feedback signal;
And this negative polarity input control circuit includes: with the numeral that produces a load current setting value to analogy converter, one negative circuit connects numeral to analogy converter, one the 3rd operational amplifier, its inverting input are to connect the output signal that receives this negative circuit output terminal; One P channel power metal oxide field effect transistor element, its conducting state controlled stage is by the 3rd control that operational amplifier connects; One load current sensing element is connected with this P channel power metal oxide field effect transistor element; One four-operational amplifier, this load current sensing element in parallel, its output produces a back coupling actual current value and delivers to the inverting input of the 3rd operational amplifier as feedback signal.
2, a kind of DC electronic load simulator, comprise many group positive polarity input control circuits and organize the negative polarity input control circuit more that it is characterized in that each group positive polarity input control circuit includes: a numeral that produces a load current setting value is to analogy converter; One first operational amplifier; One N channel power metal oxide field effect transistor element, its conducting state controlled stage is by this first control that operational amplifier connects; One load current sensing element is connected with this N channel power metal oxide field effect transistor element; One second operational amplifier, the load current size that this load current sensing element in parallel is detected, its output produces the inverting input that a back coupling actual current value is connected to this first operational amplifier; The inverting input of wherein respectively organizing first operational amplifier of positive polarity input control die set is the output terminal that is connected to an error operational amplifier jointly, and the inverting input of error operational amplifier then is to be connected in the output terminal of this numeral to analogy converter; And the output terminal of respectively organizing second operational amplifier of positive polarity input control die set is the normal phase input end that is connected to a load current totalizer jointly, and the output voltage that output terminal produced of load current totalizer is then delivered to the inverting input of error operational amplifier;
Include and respectively organize the negative polarity input control circuit: with the numeral that produces a load current setting value to analogy converter; One the 3rd operational amplifier; One P channel power metal oxide field effect transistor element, its conducting state controlled stage is by the 3rd control that operational amplifier connects; One load current sensing element is connected with this P channel power metal oxide field effect transistor element; One four-operational amplifier, this load current sensing element in parallel, output one back coupling actual current value is delivered to the inverting input of the 3rd operational amplifier; The inverting input of wherein respectively organizing the 3rd operational amplifier of negative polarity input control die set is the output terminal that is connected to a negative circuit jointly, the inverting input of this negative circuit then is connected in the output terminal of an error operational amplifier, the inverting input of error operational amplifier then is to be connected in the output terminal of this numeral to analogy converter, to receive this load current setting value; And the output terminal of respectively organizing the four-operational amplifier of negative polarity input control die set is the inverting input that is connected to a negative circuit jointly, the output terminal of this negative circuit then is the inverting input that is connected to a load current totalizer, and the output voltage that output terminal produced of load current totalizer is then delivered to the inverting input of error operational amplifier.
3, a kind of DC electronic load simulator comprises a negative polarity input control circuit, it is characterized in that this negative polarity input control circuit includes: with the numeral that produces a load current setting value to analogy converter; One negative circuit connects numeral to analogy converter; One the 3rd operational amplifier, its inverting input are the output signals that connects this negative circuit output terminal; One P channel power metal oxide field effect transistor element, its conducting state controlled stage is controlled by the 3rd operational amplifier; One load current sensing element is connected with this P channel power metal oxide field effect transistor element; One four-operational amplifier, this load current sensing element in parallel, its output produces a back coupling actual current value and delivers to the inverting input of the 3rd operational amplifier as feedback signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991074157A CN1137388C (en) | 1999-05-18 | 1999-05-18 | DC electronic load simulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991074157A CN1137388C (en) | 1999-05-18 | 1999-05-18 | DC electronic load simulator |
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| Publication Number | Publication Date |
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| CN1274088A true CN1274088A (en) | 2000-11-22 |
| CN1137388C CN1137388C (en) | 2004-02-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991074157A Expired - Fee Related CN1137388C (en) | 1999-05-18 | 1999-05-18 | DC electronic load simulator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100501436C (en) * | 2004-08-24 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Electric resistance loading system |
| US7716559B2 (en) | 2003-10-23 | 2010-05-11 | Thomson Licensing | Method for lost packet reconstruction and device for carrying out said method |
| CN101949962A (en) * | 2010-05-27 | 2011-01-19 | 东莞市锐源仪器有限公司 | Programmable electronic load |
| WO2014005356A1 (en) * | 2012-07-04 | 2014-01-09 | Shang Yanyan | Electronic load machine for detecting pc power supply |
| CN103592534A (en) * | 2013-10-28 | 2014-02-19 | 徐州市恒源电器有限公司 | Manufacturing procedure control method and device |
| CN109302059A (en) * | 2018-11-30 | 2019-02-01 | 武汉精能电子技术有限公司 | A kind of quick leadage circuit of high voltage direct current source output |
| CN110108924A (en) * | 2019-05-30 | 2019-08-09 | 上海良信电器股份有限公司 | DC current measuring circuit, method and the breaker of breaker |
| CN114460486A (en) * | 2021-12-28 | 2022-05-10 | 中科可控信息产业有限公司 | Test circuit and test system |
-
1999
- 1999-05-18 CN CNB991074157A patent/CN1137388C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7716559B2 (en) | 2003-10-23 | 2010-05-11 | Thomson Licensing | Method for lost packet reconstruction and device for carrying out said method |
| CN100501436C (en) * | 2004-08-24 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Electric resistance loading system |
| CN101949962A (en) * | 2010-05-27 | 2011-01-19 | 东莞市锐源仪器有限公司 | Programmable electronic load |
| WO2014005356A1 (en) * | 2012-07-04 | 2014-01-09 | Shang Yanyan | Electronic load machine for detecting pc power supply |
| CN103592534A (en) * | 2013-10-28 | 2014-02-19 | 徐州市恒源电器有限公司 | Manufacturing procedure control method and device |
| CN109302059A (en) * | 2018-11-30 | 2019-02-01 | 武汉精能电子技术有限公司 | A kind of quick leadage circuit of high voltage direct current source output |
| CN110108924A (en) * | 2019-05-30 | 2019-08-09 | 上海良信电器股份有限公司 | DC current measuring circuit, method and the breaker of breaker |
| CN114460486A (en) * | 2021-12-28 | 2022-05-10 | 中科可控信息产业有限公司 | Test circuit and test system |
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| Publication number | Publication date |
|---|---|
| CN1137388C (en) | 2004-02-04 |
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