CN204216791U - Single-phase programmable current source apparatus - Google Patents
Single-phase programmable current source apparatus Download PDFInfo
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- CN204216791U CN204216791U CN201420738352.2U CN201420738352U CN204216791U CN 204216791 U CN204216791 U CN 204216791U CN 201420738352 U CN201420738352 U CN 201420738352U CN 204216791 U CN204216791 U CN 204216791U
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Abstract
The utility model discloses single-phase programmable current source apparatus, comprise two CSTR control unit and current source generating unit; Two CSTR control unit is connected with touch display screen, and touch display screen connects remote monitoring platform, touch display screen and remote monitoring platform energy switch operating mutually; The output of two CSTR control unit connects current source generating unit, in two CSTR control unit, instruction current operating unit forms driving instruction electric current, control current source generating unit export the harmonic current of predetermined peak value size or realize electric current and fall temporarily, interrupt, while current source generating unit output sampled signal feed back to the input of two CSTR control unit, touch display screen or remote monitoring platform; Described current source generating unit three-phase input, single-phase output.The utility model provides a kind of digitlization, the intelligentized single-phase programmable current source apparatus for carrying out hot resistance test to devices such as low tension switch, circuit breaker, A.C. contactor, fuses.
Description
Technical field
The utility model relates to single-phase programmable current source apparatus, for providing current source in the hot resistance test of device such as low tension switch, circuit breaker, A.C. contactor, fuse.
Background technology
In order to carry out various immunity experiments to devices such as circuit breakers, the current supplying devices of test needs to carry out under rated frequency, rated current, and its power supply generally has the power supply based on the power supply using saturated core, thyristor rectified power supply, power supply able to programme.
Not only volume is large, precision is low for the equipment of employing saturable core principle, and malfunction, and response speed is slow, and error is large, is difficult to meet the accurately Test Switchboard equipment heat dropout of Laboratory Request or the condition of electromagnetic trip detection.
The thyristor adopting parallel connected in reverse phase to connect produces test current, controls its output current by the time controlling turn on thyristors angle.The performance that current employing phase control rectifier technology realizes single-phase programmable current source is mode main at present.Be converted into controlled harmonic source load through power converter, make output meet the single-phase programmable current source of test requirements document by setting parameter; Ensure that power source integral efficiency is in maximum.Size adjustment and the output of harmonic high frequency wave source of output is realized by controlling silicon controlled conducting phase shift angle.But still exist equipment failure rate high, cannot harmonic current needed for free setting, increase the shortcomings such as function difficulty, harmonic pollution be serious.
Although power supply able to programme in the market have volume little, easy to operate, can free setting required detects electric current, loss is low, harmonic pollution is low, have multiple harmonic wave function simultaneously, but output current is generally at ampere levels, be applied to small area analysis test, the requirement of the high-power industrial equipment size of test can not be met.Cannot fall temporarily and abort by property performance period electric current simultaneously.
In sum, be used for the equipment and instrument of low tension switch device resistance test according to known technology, the requirement of test can not be met, market there is no corresponding equipment.Cannot normally detect for the hot resistance test of high-power switch device.
Utility model content
The purpose of this utility model is exactly to solve the problem, and provides a kind of single-phase programmable current source apparatus, carries out in hot resistance test for devices such as low tension switch, circuit breaker, A.C. contactor, fuses.Carry out main circuit temperature rise test and when making a service test to the low-voltage circuit breaker of having electronic overcurrent protection, can high accuracy, intelligentized generation harmonic current and electric current fall temporarily and interrupt function, output current reaches tens thousand of ampere.
To achieve these goals, the utility model adopts following technical scheme:
Single-phase programmable current source apparatus, comprises two CSTR control unit and current source generating unit;
Described two CSTR control unit is connected with touch display screen, touch display screen connects remote monitoring platform, the call parameter that can generate the current waveform that experiment needs that two CSTR control unit reception touch display screen or remote monitoring platform issue, touch display screen and remote monitoring platform can mutual switch operatings.
The output of two CSTR control unit connects current source generating unit, the driving instruction current-controlled current source generating unit that in two CSTR control unit, instruction current operating unit is formed exports the harmonic current of predetermined peak value size or realizes electric current and fall temporarily, interrupt, simultaneously the sampled signal of current source generating unit output feeds back to the input of two CSTR control unit, touch display screen or remote monitoring platform, difference according to setup parameter and actual output parameter is finely tuned, and ensures output accuracy requirement; Described current source generating unit three-phase input, single-phase output.The harmonic number that current source generating unit generates electric current is 2-51 time, and harmonic content is the arbitrary proportion in 0% to 100%.
The input side of described current source generating means is connected with line voltage by circuit breaker, then three-phase input reactance device, three-phase ac contactor is connected in series successively, parallel connection buffer loop, every cross streams contactor two ends, avoids contactor band to carry the impact of break-make to device and equipment; Three-phase ac contactor output access rectification unit, rectification unit converts alternating voltage to controlled direct voltage, and three-phase ac contactor controls the connecting and disconnecting of the circuit of rectification unit front end; The outlet side of rectification unit accesses three groups of inverter assemblies, the energy storage capacitor that inverter assembly busbar voltage is supported by DC bus maintains, DC bus Support Capacitor two series connection, its series connection mid point is the center line N of three groups of inverters, and DC bus is positive and negative to be connected with three groups of inverter assembly direct current inputs; The DC side parallel of three groups of inverter assemblies, independently exports together; The output often organizing inverter assembly is connected with output AC contactor by out put reactor, and has independent RC High frequency filter absorbing circuit; 3 output contactors are connected in parallel with the unconnected one end of corresponding reactor; Then the input of different checkout equipment is accessed through isolating transformer, for checkout equipment provides power supply.
Described inverter assembly output current Hall detection signal and output current transformer detection signal feed back to the input of the instruction current arithmetic element in two CSTR control unit, the input parameter of accurate correcting current source generating unit, active accommodation DC bus operating voltage, Protection parameters setting and monitoring, the size of the current peak of each Several Typical Load; The driving instruction electric current of two CSTR control unit utilizes Optical Fiber Transmission to be connected to inverter bridge drive singal unit in inverter assembly.
Often organize inverter assembly and adopt IGBT full-bridge inverting, three groups of inverter assemblies accept control respectively, use in parallel, the phase place of output current is consistent, according to the size needing checkout equipment capacity during test, touch display screen or remote monitoring platform send instruction, provide actual act signal by two CSTR control unit, control the break-make often organizing inverter assembly output AC contactor, meet different capabilities demand.
Line voltage is successively by accessing rectification unit after circuit breaker, three-phase input reactance device, three-phase ac contactor, and rectification unit converts alternating voltage to controlled direct voltage, and three-phase ac contactor controls the connecting and disconnecting of the circuit of rectification unit front end; Voltage after rectification accesses three groups of inverter assemblies;
Two CSTR control unit accepts the call parameter of current waveform needed for experiment that touch display screen or remote monitoring platform issue, and the way of output or fall temporarily and interrupt output mode continuously;
Instruction current arithmetic element in DSP control unit produces instruction current by data processing, form each pulse driving device and synchronous pulse generating device, the input of instruction current arithmetic element connects current detecting unit and direct voltage detecting unit simultaneously, synchronizing signal is produced, in order to drive three groups of inverter assembly generation current waveforms through data processing;
Inverter assembly output current Hall detection signal and output current transformer detection signal feed back in dsp controller; the input parameter of accurate correcting current source generating unit; active accommodation DC bus operating voltage, the size of the current peak of each Several Typical Load, Protection parameters setting and monitoring.
To any current source, by controlling amplitude and the phase place of electric current, the current source of various different demand can be produced.Electric current is become to be made up of fundamental current and individual harmonic current by analog-to-digital conversion.
By the waveform of reality by fast Fourier transform fft analysis,
In formula: ω
1for the angular frequency of power frequency, unit is rad/s; H is harmonic number; I
hbe the root-mean-square value of h subharmonic current, unit is A; β
hbe h subharmonic current go out phase angle, unit is rad; M is the most high reps of harmonic wave considered, determines according to the most high reps of the required harmonic current source of test.
First-harmonic to 51 subharmonic current is split, generates as shown in the table, each harmonic frequency, amplitude, phase place, then its amplitude, phase place are carried out amplitude normalization and gathered.
| Harmonic number | Frequency | Amplitude | Phase place | Amplitude ^2 | Normalization amplitude | Harmonic wave ^2 |
| 1 | 50 | |||||
| 2 | 100 | |||||
| 3 | 150 | |||||
| 4 | 200 | |||||
| 5 | 250 | |||||
| 6 | 300 | |||||
| 7 | 350 | |||||
| 8 | 400 | |||||
| . | . | |||||
| . | . | |||||
| 51 | 2550 |
According to fundamental frequency n, doubly (n is positive integer, ≤ 51), split into the superposition of the sine wave of different frequency, by carrying out amplitude and phase place change to each harmonic split, numerical value normalization, within a primitive period, carry out N number of point data reduction, N be greater than 0 natural number, N is larger, and accuracy is higher, changes fundamental current, individual harmonic current amplitude, phase value respectively.
| Harmonic number | Amplitude | Angle | Radian | 0 | 1 | 2 | 3 | 4 | 5 | 6 | . | . | N |
| 1 | |||||||||||||
| 2 | |||||||||||||
| 3 | |||||||||||||
| 4 | |||||||||||||
| 5 | |||||||||||||
| 6 | |||||||||||||
| 7 | |||||||||||||
| 8 | |||||||||||||
| . | |||||||||||||
| . | |||||||||||||
| 51 |
By to each harmonic range-adjusting, the required value of current source harmonic content when can meet different testing requirement, arrange each harmonic phase angle, peak factor when adjustment current source exports, when harmonic spike and the superposition of first-harmonic peak value, power supply output peak value system is the highest.
Adjustment makes each harmonic superpose with first-harmonic peak forward, obtains different harmonic content electric power outputting current peak factor different, meets current source and exports peak factor.
The beneficial effects of the utility model:
1) the utility model provides a kind of digitlization, the intelligentized single-phase programmable current source apparatus for carrying out hot resistance test to devices such as low tension switch, circuit breaker, A.C. contactor, fuses.
2) inverter circuit adopts IGBT switching device, have volume little, easy to operate, can free setting requiredly detects electric current, loss is low, harmonic pollution is low, there is multiple harmonic wave and current interruptions simultaneously and fall function temporarily.
3) realize harmonic content 0% to 100% arbitrary proportion to export, simultaneously can by touch display screen setting adjustment to peak factor size, the peak factor electric current required for output, can meet different tests demand.
4) adopt many DSP control system, control precision is high, and speed is fast, and optical fiber drives, safe and reliable, antijamming capability is strong.Power output is large, output-current rating ampere up to ten thousand.
5) Digital Control, friendly touch display screen unit, is convenient to optimum configurations; Containing harmonic filtration equipment in this device, harmonic pollution can not be caused to electrical network.
6) the multiple parallel connection of inverter assembly, can realize the output changing electric current ascending range, improve and detect accuracy, actual export and setting export between error≤1%, according to after connect transformer voltage ratio size, output can reach tens thousand of Ampere currents.
Accompanying drawing explanation
Fig. 1 is application structure schematic diagram of the present utility model;
Fig. 2 is current source generating means circuit theory diagrams;
Fig. 3 is inverter schematic diagram;
Fig. 4 is that single harmonic component and first-harmonic form harmonic content and peak factor relation;
Fig. 5 is that two kinds of harmonic waves and first-harmonic form harmonic content and peak factor relation;
Figure 6 shows that first-harmonic reduction waveform;
Fig. 7 is 5 subharmonic reduction waveforms;
Fig. 8 be first-harmonic and 5 subharmonic adjustment phase place after waveform;
Fig. 9 is first-harmonic and the rear waveform of 5 subharmonic superposition;
Figure 10 is for falling temporarily and interrupting implementation result oscillogram.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail.
Carrying out in immunity experiment to low-voltage circuit breaker, needing to provide the current-source arrangement meeting experimental condition, be connected on the circuit breaker of test by the output of this supply unit, the current source of the various output characteristic of programming simulation, the demand according to test sets.
Single-phase programmable current source apparatus, comprises two CSTR control unit and current source generating unit;
Two CSTR control unit is connected with touch display screen, and touch display screen connects remote monitoring platform, the call parameter that can generate the current waveform that experiment needs that two CSTR control unit reception touch display screen or remote monitoring platform issue.Touch display screen and remote monitoring platform energy switch operating mutually, the direct transmitting order to lower levels of touch display screen energy is to two CSTR control unit; Remote monitoring platform also can transmitting order to lower levels to touch display screen, touch display screen again transmitting order to lower levels to two CSTR control unit.
The output of two CSTR control unit connects current source generating unit, the driving instruction current-controlled current source generating unit that in two CSTR control unit, instruction current operating unit is formed exports the harmonic current of predetermined peak value size or realizes electric current and fall temporarily, interrupt, simultaneously the sampled signal of current source generating unit output feeds back to the input of two CSTR control unit, touch display screen or remote monitoring platform, difference according to setup parameter and actual output parameter is finely tuned, and ensures output accuracy requirement; Current source generating unit three-phase inputs, single-phase output.The harmonic number that current source generating unit generates electric current is 2-51 time, and harmonic content is the arbitrary proportion in 0% to 100%.
As shown in Figure 1, by the output of testing equipment by transformer access device.
AC network is by after the input reactance device of equipment, three-phase commutation bridge, inversion unit, out put reactor, harmonic current required for generation or fall electric current temporarily, and output on transformer that user provides, in order to carry out the detection of low-voltage complete switch equipment and the control appliance of being correlated with, the sampled signal before and after transformer feeds back in two CSTR control unit.
Shown in Fig. 2, QF1 is input protection circuit breaker, and L1 is that input reactance device can eliminate interference, and KM1 is input snubber contact device, to alleviate when powering on line voltage to the impact of DC bus capacitance.L, R, C form switching harmonics filter, eliminate switching harmonics.
The input side of current source generating means is connected with line voltage by circuit breaker, is then connected in series three-phase input reactance device, three-phase ac contactor successively, parallel connection buffer loop, every cross streams contactor two ends, avoids contactor band to carry the impact of break-make to device and equipment; Three-phase ac contactor output access rectification unit, rectification unit converts alternating voltage to controlled direct voltage, and three-phase ac contactor controls the connecting and disconnecting of the circuit of rectification unit front end; The outlet side of rectification unit accesses three groups of inverter assemblies, the energy storage capacitor that inverter assembly busbar voltage is supported by DC bus maintains, DC bus Support Capacitor two series connection, its series connection mid point is the center line N of three groups of inverters, and DC bus is positive and negative to be connected with three groups of inverter assembly direct current inputs; The DC side parallel of three groups of inverter assemblies, independently exports together; The output often organizing inverter assembly is connected with output AC contactor by out put reactor, and has independent RC High frequency filter absorbing circuit; 3 output contactors are connected in parallel with the unconnected one end of corresponding reactor; Then the input of different checkout equipment is accessed through isolating transformer, for checkout equipment provides power supply.
Inverter assembly output current Hall detection signal and output current transformer detection signal feed back to the input of the instruction current arithmetic element in two CSTR control unit, the input parameter of accurate correcting current source generating unit, active accommodation DC bus operating voltage, Protection parameters setting and monitoring, the size of the current peak of each Several Typical Load; Two CSTR control unit driving instruction electric current utilize Optical Fiber Transmission to be connected to inverter bridge drive singal unit in inverter assembly.
Fig. 3 is the utility model inverter schematic diagram.Single-phase programmable current source is by after three phase full bridge rectification, adopt DSP control technology, corresponding PWM control is carried out to inversion unit, make output three tunnel in parallel, expand the output load capacity of system, and can accordingly according to size of current select export way number, energy savings, and improve detect precision and reliability.
Touch display screen is connected with two CSTR controller with remote monitoring platform, and the programming of implement device monitoring, the temporary range of decrease value of analogue current sources data waveform, harmonic content, peak factor, current interruptions, electric current is changed, verify, issue, control, show, adjustment etc.Setting up deals with problems arising from an accident carries out device start; The fine setting of first-harmonic and harmonic content can be carried out according to value of feedback after device start.
Line voltage is successively by accessing rectification unit after circuit breaker, three-phase input reactance device, three-phase ac contactor, and rectification unit converts alternating voltage to controlled direct voltage, and three-phase ac contactor controls the connecting and disconnecting of the circuit of rectification unit front end; Voltage after rectification accesses three groups of inverter assemblies;
Two CSTR control unit accepts the call parameter of current waveform needed for experiment that touch display screen or remote monitoring platform issue, and the way of output or fall temporarily and interrupt output mode continuously; And current waveform can show on touch display screen or remote monitoring platform; Touch display screen or remote monitoring platform issue current waveform be two CSTR control unit prestore current waveform time, touch display screen or remote monitoring platform can directly call and show;
The conventional current waveform that two CSTR control unit prestores has fundamental waveform; First-harmonic and 3 subharmonic; First-harmonic and 5 subharmonic; First-harmonic and 3 subharmonic, 5 subharmonic, 7 subharmonic etc.
Instruction current arithmetic element in two CSTR control unit produces instruction current by data processing, form each pulse driving device and synchronous pulse generating device, the input of instruction current arithmetic element connects current detecting unit and direct voltage detecting unit simultaneously, synchronizing signal is produced, in order to drive three groups of inverter assembly generation current waveforms through data processing;
Need current source power size according to test, in the enterprising line output numerical parameter setting of touch display screen, the operating time is selected, and clock clocking capability; Be convenient to check, check the authenticity of programmable current source current waveform, the state information of current source work by display interface;
Touch display screen or remote monitoring platform issue current waveform when being the non-current waveform prestored, and the current waveform of the harmonic current source of demand is carried out the waveform reduction of a primitive period N number of point by two CSTR control unit; Then by regulating harmonic content and the angle of phase displacement of first-harmonic and the harmonic wave needed, realize each waveform after reduction and overlaid waveforms, obtain the effective value of superposition after-current, maximum and peak factor simultaneously, form driving instruction electric current, realize the driving of inverter assembly;
Inverter assembly output current Hall detection signal and output current transformer detection signal feed back in dsp controller, the input parameter of correcting current source generating unit.
To any current source, electric current is become to be made up of fundamental current and individual harmonic current by analog-to-digital conversion.
By the waveform of reality by fast Fourier transform fft analysis,
In formula: ω
1for the angular frequency of power frequency, unit is rad/s; H is harmonic number; I
hbe the root-mean-square value of h subharmonic current, unit is A; β
hbe h subharmonic current go out phase angle, unit is rad; M is the most high reps of harmonic wave considered, determines according to the most high reps of the required harmonic current source of test.
First-harmonic to 51 subharmonic current is split, generates as shown in the table, each harmonic frequency, amplitude, phase place, then its amplitude, phase place are carried out amplitude normalization and gathered.
| Harmonic number | Frequency | Amplitude | Phase place | Amplitude ^2 | Normalization amplitude | Harmonic wave ^2 |
| 1 | 50 | |||||
| 2 | 100 | |||||
| 3 | 150 |
| 4 | 200 | |||||
| 5 | 250 | |||||
| 6 | 300 | |||||
| 7 | 350 | |||||
| 8 | 400 | |||||
| . | . | |||||
| . | . | |||||
| 51 | 2550 |
According to fundamental frequency n, doubly (n is positive integer, ≤ 51), split into the superposition of the sine wave of different frequency, by carrying out amplitude and phase place change to each harmonic split, numerical value normalization, within a primitive period, carries out 256 point data reduction, when getting 256, accuracy can meet the demands, and changes fundamental current, individual harmonic current amplitude, phase value respectively.
| Harmonic number | Amplitude | Angle | Radian | 0 | 1 | 2 | 3 | 4 | 5 | 6 | . | . | 256 |
| 1 | |||||||||||||
| 2 | |||||||||||||
| 3 | |||||||||||||
| 4 | |||||||||||||
| 5 | |||||||||||||
| 6 | |||||||||||||
| 7 | |||||||||||||
| 8 | |||||||||||||
| . | |||||||||||||
| . | |||||||||||||
| 51 |
By to each harmonic range-adjusting, the required value of current source harmonic content when can meet different testing requirement, arrange each harmonic phase angle, peak factor when adjustment current source exports, when harmonic spike and the superposition of first-harmonic peak value, power supply output peak value system is the highest.
Adjustment makes each harmonic superpose with first-harmonic peak forward, obtains different harmonic content electric power outputting current peak factor different, meets current source and exports peak factor.As Fig. 4-5, each harmonic distortion can be set easily and meet peak factor requirement in scope.
Consist of example with first-harmonic and 5 subharmonic, 5 subharmonic content are set as first-harmonic content 50%, by adjustment phase place, 5 subharmonic and first-harmonic are appreciated and be superimposed, it is the highest that it exports peak factor, and after different harmonic content superposition, peak factor is different.
Be illustrated in figure 6 first-harmonic reduction waveform, Fig. 7 be 5 subharmonic reduction waveforms, Fig. 8 be first-harmonic and 5 subharmonic adjustment phase place after waveform, Fig. 9 be first-harmonic and 5 subharmonic superposition after waveform.
Can to falling current amplitude temporarily and the cycle of falling is arranged temporarily by touch display screen or remote monitoring platform.As shown in Figure 10 for fall and to interrupt implementation result oscillogram temporarily, wherein I
rfor setting current; I
dfor falling test current temporarily; △ t is for fall the time temporarily; 4 △ t are electric current application time.
Touch display screen is arranged respectively to first-harmonic and each harmonic, and user directly can input first-harmonic and each harmonic relative scale, according to the reference settings each harmonic phase shift angle provided.After setting parameter, can direct preview waveform, be transferred to two CSTR control unit and issue confirmation.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the restriction not to the utility model protection range; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection range of the present utility model.
Claims (5)
1. single-phase programmable current source apparatus, is characterized in that, comprises two CSTR control unit and current source generating unit;
Described two CSTR control unit is connected with touch display screen, touch display screen connects remote monitoring platform, the parameter of the current waveform that the experiment that reception touch display screen or remote monitoring platform issue needs, touch display screen and remote monitoring platform energy switch operating mutually;
The output of two CSTR control unit connects current source generating unit, in two CSTR control unit, instruction current operating unit forms driving instruction electric current, control current source generating unit export the harmonic current of predetermined peak value size or realize electric current and fall temporarily, interrupt, while current source generating unit output sampled signal feed back to the input of two CSTR control unit, touch display screen or remote monitoring platform; Described current source generating unit three-phase input, single-phase output.
2. single-phase programmable current source apparatus as claimed in claim 1, it is characterized in that, the input side of described current source generating means is connected with line voltage by circuit breaker, then three-phase input reactance device, three-phase ac contactor is connected in series successively, parallel connection buffer loop, every cross streams contactor two ends, avoids contactor band to carry the impact of break-make to device and equipment;
Three-phase ac contactor output access rectification unit, rectification unit converts alternating voltage to direct voltage, and three-phase ac contactor controls the connecting and disconnecting of the circuit of rectification unit front end;
The outlet side of rectification unit accesses three groups of inverter assemblies, and the DC side parallel of three groups of inverter assemblies, independently exports together; The output often organizing inverter assembly is connected with output AC contactor by out put reactor, and has independent RC High frequency filter absorbing circuit;
Touch display screen or remote monitoring platform send instruction, provide actual act signal by two CSTR control unit, control the break-make often organizing inverter assembly output AC contactor, meet distinct device capacity requirement;
3 output contactors are connected in parallel with the unconnected one end of corresponding reactor; Then the input of different checkout equipment is accessed through isolating transformer, for checkout equipment provides power supply.
3. single-phase programmable current source apparatus as claimed in claim 2, it is characterized in that, described inverter assembly output current Hall detection signal and output current transformer detection signal feed back to the input of the instruction current arithmetic element in two CSTR control unit, two CSTR control unit driving instruction electric current utilize Optical Fiber Transmission to be connected to inverter bridge drive singal unit in inverter assembly.
4. single-phase programmable current source apparatus as claimed in claim 2, is characterized in that, often organize inverter assembly and adopt IGBT full-bridge inverting, three groups of inverter assemblies accept control respectively, in parallelly uses, and the phase place of output current is consistent.
5. single-phase programmable current source apparatus as claimed in claim 1, it is characterized in that, the harmonic number that described current source generating unit can generate electric current is 2-51 time, and harmonic content is the arbitrary proportion in 0% to 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420738352.2U CN204216791U (en) | 2014-11-28 | 2014-11-28 | Single-phase programmable current source apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420738352.2U CN204216791U (en) | 2014-11-28 | 2014-11-28 | Single-phase programmable current source apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485825A (en) * | 2014-11-28 | 2015-04-01 | 山东华天电气有限公司 | Single-phase programmable current source device and control method thereof |
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- 2014-11-28 CN CN201420738352.2U patent/CN204216791U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485825A (en) * | 2014-11-28 | 2015-04-01 | 山东华天电气有限公司 | Single-phase programmable current source device and control method thereof |
| CN104485825B (en) * | 2014-11-28 | 2017-02-22 | 山东华天电气有限公司 | Single-phase programmable current source device and control method thereof |
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| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150318 Effective date of abandoning: 20170222 |