CN102841258A - Measuring device and method for direct current supply output impedance - Google Patents

Measuring device and method for direct current supply output impedance Download PDF

Info

Publication number
CN102841258A
CN102841258A CN2012103372967A CN201210337296A CN102841258A CN 102841258 A CN102841258 A CN 102841258A CN 2012103372967 A CN2012103372967 A CN 2012103372967A CN 201210337296 A CN201210337296 A CN 201210337296A CN 102841258 A CN102841258 A CN 102841258A
Authority
CN
China
Prior art keywords
frequency
current
phasor
circuit
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2012103372967A
Other languages
Chinese (zh)
Other versions
CN102841258B (en
Inventor
梅高峰
刘民
孙毅
金光远
郝慧萍
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
514 Institute of China Academy of Space Technology of CASC
Beijing Dongfang Measurement and Test Institute
Original Assignee
514 Institute of China Academy of Space Technology of CASC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 514 Institute of China Academy of Space Technology of CASC filed Critical 514 Institute of China Academy of Space Technology of CASC
Priority to CN201210337296.7A priority Critical patent/CN102841258B/en
Publication of CN102841258A publication Critical patent/CN102841258A/en
Application granted granted Critical
Publication of CN102841258B publication Critical patent/CN102841258B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses a measuring device and method for direct current supply output impedance. The measured direct current supply output impedance is defined at a specific operating point and a specific test cross section, the presented equivalent impedance is seen in the direction of the test cross section facing a power supply, and system deviation in the measuring process, caused by load input impedance, is avoided. The measuring device comprises a test frequency point voltage phasor extraction module, a test frequency point current phasor extraction module, a low-current excitation load module, a sweep frequency phasor analysis module and a control computer, wherein the test frequency point voltage phasor extraction module and the test frequency point current phasor extraction module are respectively connected with a voltage input end and a current input end of the sweep frequency phasor analysis module; the signal output end of the sweep frequency phasor analysis module is connected with the low-current excitation load module; and the sweep frequency phasor analysis module is further connected with the control computer.

Description

A kind of direct supply output impedance measurement mechanism and measuring method thereof
Technical field
The present invention relates to DC power system impedance measurement technique field, particularly relate to a kind of direct supply output impedance measurement mechanism and measuring method thereof.
Background technology
The system that DC power system is made up of power supply and many loads, the power-supply system impedance can be divided into power supply output impedance and two parts of load input impedance.Power supply output impedance is the power supply quality, compatibility of reflection power-supply system, the important technology index of stability, and load input impedance is the important technology index that reflection input filter or power supply changeover device DC-DC suppress Conduction Interference, inhibitory reflex power.Both are referred to as the power-supply system impedance altogether.
Power system design with electric loading design often by different research institutes, accomplish in different time.For example VXI, PXI chassis power supply, computer power supply bus, communication power supply bus, spacecraft power supply bus and international space station power supply or the like.Only after power supply output impedance is decided, require the input impedance after all load parallel connections to be far longer than power supply output impedance again, could guarantee system stability.Power supply output impedance parameter becomes the significant data of designing power supply system and load.Having only actual measurement to go out power supply output impedance and load input impedance could also need the output impedance of actual measurement power supply to come the online reason of searching when disturbing appears in power-supply system with quantitative data detection design objective.At present external spacecraft power supply has used power supply output impedance to estimate the quality of power supply as technical indicator, in the technical manual of European Space Agency, has stipulated the family curve requirement of spacecraft output impedance, and has stipulated the DC-DC power supply stability requirement of cascade.The international space station power-supply system is in order to adapt to from each country with from the electric loading of use of different company, special provision the limited field of power supply output impedance and load input impedance, with the stable operation of assurance total system.Therefore; If there is not reliable power supply output impedance measuring technique; With regard to being difficult to the system stability of power supply and load is carried out quantitative test; When power system design, also be difficult to propose the technical requirement of power supply output impedance technical requirement and load input impedance, so power supply output impedance measuring technique is an important measuring technique anxious to be developed.
The characteristics of direct supply output impedance are: 1. direct supply output impedance is different from the components and parts impedance, also is different from the internal resistance of source.The components and parts impedance is by material behavior and geometry decision; Like the impedance of resistance device is by the resistivity of conductive filament and geometric configuration decision; The impedance of capacitor element is by the decision of the resistance of capacitor plate area, polar plate spacing, dielectric dielectric number of fields and pin electric wire and geometric configuration, and the impedance of inductance component is determined by magnetic permeability inside and outside area coil and the number of turn, the coil and coil resistance and geometric configuration.Power supply output impedance is different from the components and parts impedance, and it is to be determined by the distribution parameter on output characteristic of power source and the power source bus, and power supply output impedance is when power supply the inherent characteristic that shows to be arranged under the condition of power output.It also is different from the internal resistance of source, and internal resistance is the change in voltage of power output end and the ratio that load current changes.Voltage and current is all at dc state, and so-called the variation is meant two kinds of differences between the direct current output state.Internal resistance can represent that power supply exists non-linear with the tangent slope of VA characteristic curve, and the size of internal resistance is also inequality under the different operating state, and desirable voltage source Us internal resistance Rs is zero, and desirable current source Is internal resistance Rg is infinitely great.2. direct supply output impedance is the impedance under the small-signal condition.Direct supply is a NLS, and on the working point of different voltages with different and electric current, impedance is different.Exist near the working point between little dynamic area, can regard the approximately linear interval as.When therefore measuring source impedance; Can only apply the sinusoidal excitation electric current of small magnitude, guarantee that under the distortionless situation, the voltage disturbance of generation is also undistorted; Under this small-signal condition, could calculate source impedance with the voltage phasor and the electric current phasor of certain single-frequency.Generally below 10kHz; Source impedance is less than 0.1 Ω; If the amplitude of ac-excited electric current less than 0.1A then the alternating voltage response on the bus less than 10mV; So little voltage signal is submerged in the bus noise, can have a strong impact on accuracy of measurement, and the problems of measurement of tiny signal is the difficult problem in the impedance measurement.3. direct supply output impedance is the distribution parameter impedance.Power supply output impedance is not only relevant with the power supply control characteristic; Also relevant with the measurement cross section with transmission line of electricity, under the high frequency situations (generally greater than 10kHz), power supply output impedance is influenced by the bus distribution parameter; Increase gradually, and the bus distribution parameter is chosen relevant with the measurement cross section.
Therefore, the measurement of direct supply output impedance is different from passive impedor measurement, can not directly use impedometer.It must be when direct supply be worked, and injection current excitation or voltage drive are measured response voltage or electric current then, through the phasor ratio acquisition impedance measurements of calculating voltage and electric current.But for fear of nonlinear distortion, excitation often is operated in the small-signal interval with response, measures for small-signal, very difficulty.Under the direct supply condition of work, when power supply output impedance very hour, below 0.1 Ω, alternating voltage to be measured usually is submerged in the noise of direct supply itself.The surveying instrument and the equipment that also do not have commercial direct supply output impedance at present internal and international.And general, commercialization impedometer and vector network analyzer can only be measured the AC impedance of passive device, can not directly be used to measure power supply output impedance and load input impedance.
Record according to domestic and international correlation technique document; Measure the method for power supply output impedance at present; The general frequency response analyzer that adopts; Produce ac-excited signal VAC by frequency response analyzer, measure amplitude proportion and the phase differential of busbar voltage Vtest and sample resistance voltage Vref simultaneously, measurement result provides with Bode diagram.Survey frequency scope 10Hz~200kHz, used frequency response analyzer have 350 series of U.S. Venable company, also have the AP200 series of U.S. Ridley company.
Fig. 1 adopts the current transformer coupling process inject to exchange current perturbation, a little less than the coupling too of disturbing signal, when the impedance of mutual inductor left end hour, the signal source of right-hand member is operated in the current source state, it is comparatively difficult to do excitation with the Frequency Response Analysis appearance.The DC electronic load is set dc point through DC current I0 (DC).The input impedance of DC electronic load is parallelly connected with the output impedance of tested power supply, and the resistance value that actual measurement obtains is direct supply output impedance and the parallelly connected result of DC electronic load input impedance.When DC load input impedance during much larger than power supply output impedance, measurement result is similar to power supply output impedance.But high band often load input impedance is suitable with power supply output impedance, and measurement result produces very mistake.
Fig. 2 adopts FET to amplify the interchange disturbing signal, directly drives FET with busbar voltage, and its thermonoise also is enlarged into the interchange disturbing signal under higher busbar voltage, has disturbed normal measurement.Same measured resistance value is power supply output impedance and the parallelly connected result of DC electronic load input impedance, under the D.C. high-current situation (for example, electronic load input impedance is less than 10 Ω), produces system deviation greatly.
Fig. 3 has designed activated amplifier the swept-frequency signal of frequency response analyzer has been amplified rear drive coupling mutual inductor; Inject the interchange disturbing signal through the coupling mutual inductor; Enlarged the scope of application, but the coupling transformer frequency response bandwidth is narrower, actual measurement only reaches 200kHz; Same measured resistance value has comprised the input impedance parallel connection situation of DC electronic load, produces big system deviation.
Also recommend a kind of method of measuring power supply output impedance in the product description of the 4395A network analyzer of Agilent company, seen Fig. 4.The same with top problem, the input impedance of load has also become measured object, and actual measurement data is the input impedance of the load result parallelly connected with power supply output impedance, and big system deviation is arranged.
Summary of the invention
The invention discloses a kind of direct supply output impedance measurement mechanism and measuring method thereof; Measured direct supply output impedance is to be defined in concrete working point (a definite DC voltage and the DC current of power work in rated range), concrete testing section; Direction from testing section towards power supply is seen the equiva lent impedance that is demonstrated, and overcomes the system deviation of the measuring process that the influence owing to load input impedance causes.
Technical scheme of the present invention is:
A kind of direct supply output impedance measurement mechanism is characterized in that, comprises test frequency voltage phasor extraction module, test frequency electric current phasor extraction module, little current excitation load blocks, frequency sweep phasor analysis module and control computer; Said test frequency voltage phasor extraction module and test frequency electric current phasor extraction module are connected the voltage input end and the current input terminal of frequency sweep phasor analysis module respectively; The signal output part of said frequency sweep phasor analysis module connects little current excitation load blocks, and said frequency sweep phasor analysis module also is connected with control computer; Said test frequency voltage phasor extraction module is connected to the voltage sample end that connects the testing section of choosing on the power source bus of load at tested power supply; The amplitude and the phase place of the voltage signal that to extract tested both ends of power frequency be ω; Said testing section between tested power supply and load towards square section that the power supply direction is seen; It is the amplitude and the phase place of the current signal of ω from the power source bus extraction through the frequency that testing section flows to tested power supply that said test frequency electric current phasor extraction module adopts the noncontact mode; Said little current excitation load blocks is connected the load end of tested power supply; Frequency through said frequency sweep phasor analysis module output certain amplitude is the sinusoidal excitation signal of ω; Introducing a frequency that power supply is applied disturbance at the load end of tested power supply is the sine-wave current load of ω; Said frequency sweep phasor analysis module is according to the amplitude of the voltage signal that receives and the amplitude and the phase place of phase place and current signal, the range value and the phase value of the output impedance when calculating tested power supply at said testing section in frequencies omega; The output frequency ω of control computer control frequency sweep phasor analysis module and the result of calculation of receiving frequency-sweeping phasor analysis module are stored and post-processed.
The signal output part of said frequency sweep phasor analysis module also connects open circuit/short circuit/load calibration excitation signal output module; Said open circuit/short circuit/load calibration excitation signal output module opening a way/be connected load end during short circuit/load calibration, be used for all breaking off afterwards the output drive signal to testing section from power source bus in tested power supply and load and little current excitation load blocks; Said open circuit/short circuit/load calibration excitation signal output module comprises negative feedback operational amplifier; The positive input terminal of operational amplifier connects the signal output part and the delivery value of frequency sweep phasor analysis module and adds dc bias circuit through totalizer; The output terminal series diode of operational amplifier; The electrode input end of diode connects the voltage-limiting protection circuit, and the cathode output end of diode connects the voltage sample end of testing section through calibration switch.
Said test frequency voltage phasor extraction module comprises first capacitance and second capacitance that is connected with testing section voltage sample end; First capacitance is connected the first signal input buffer circuit and secondary signal input buffer circuit respectively with second capacitance; The first signal input buffer circuit is connected differential amplifier circuit more simultaneously with the secondary signal input buffer circuit, and differential amplifier circuit connects the voltage input end of frequency sweep phasor analysis module.
Said test frequency electric current phasor extraction module comprises low frequency test frequency electric current phasor extraction module; Said low frequency test frequency electric current phasor extraction module comprises a current transformer of being made by the magnet ring of high magnetic permeability; Be wound with secondary induction winding and direct current on the said current transformer respectively and compensate for winding; Said secondary induction winding connects current-to-voltage converting circuit and signal condition and frequency compensated circuit successively, and signal condition and frequency compensated circuit connect the current input terminal of frequency sweep phasor analysis module; Said direct current compensates for winding and is connected the dc current measurement device with low-pass filter circuit through the DC circuit driving circuit that connects successively; Said dc current measurement device becomes voltage signal to the bus current conversion of signals that records; After low-pass filter circuit filtering alternating component, compensate for the DC current of the magnetic induction density that DC current that one of winding output can offset power source bus produces again to direct current through the DC circuit driving circuit in current transformer.
Said test frequency electric current phasor extraction module comprises high-frequency test frequency electric current phasor extraction module; Said high-frequency test frequency electric current phasor extraction module comprises a current transformer of being made by the magnet ring of low magnetic permeability; Be wound with the secondary induction winding on the said current transformer; Said secondary induction winding connects current-to-voltage converting circuit and signal condition and frequency compensated circuit successively, and signal condition and frequency compensated circuit connect the current input terminal of frequency sweep phasor analysis module.
Said little current excitation load blocks comprises negative feedback closed loop control and the driving circuit of being made up of operational amplifier, field effect transistor, sample resistance; The positive input terminal of operational amplifier connects the signal output part and the delivery value circuit of frequency sweep phasor analysis module through totalizer; The output terminal of operational amplifier connects the control utmost point of field effect transistor; An output stage of field effect transistor is connected tested positive source through current limliting with the fuse protection circuit, and another output stage connects tested power cathode through sample resistance.
Said frequency sweep phasor analysis module comprises digital logic device; Said test frequency voltage phasor extraction module is connected said digital logic device through the input signal conditioning circuit respectively successively with test frequency electric current phasor extraction module with analog to digital conversion circuit, said digital logic device is connected said little current excitation load blocks or open circuit/short circuit/load calibration excitation signal output module through D/A converting circuit successively with output signal conditioning circuit; Said digital logic device comprises the DDS Direct Digital formula frequency synthesis unit that is connected with clock chip; Said DDS Direct Digital formula frequency synthesis unit connects sine integral module and integral cosine module respectively through multiplier; The two-way frequency of DDS Direct Digital formula frequency synthesis unit output is to send into sine integral module and integral cosine module more respectively after orthogonal signal sin (ω t) and the cos (ω t) of ω multiplies each other with voltage digital signal U (t) that inputs to digital logic device and current digital signal I (t) respectively; Said sine integral module is connected phasor division arithmetic module with the integral cosine module, said phasor division arithmetic module is connected with control computer through communication interface; Said DDS Direct Digital formula frequency synthesis unit also connects said D/A converting circuit, is that sin (ω t) signal or cos (ω t) signal of ω exported to D/A converting circuit with the frequency that generates; Said DDS Direct Digital formula frequency synthesis unit is connected with control computer through communication interface, by the output frequency of control computer control DDS Direct Digital formula frequency synthesis unit.
A kind of direct supply output impedance measuring method; It is characterized in that; Set up the working point of tested power supply and load; On tested power supply and power source bus that load is connected, choose testing section; Said testing section between tested power supply and load towards the square section that the power supply direction is seen, the frequency of the output terminal output certain amplitude through frequency sweep phasor analysis module is that the sinusoidal signal of ω gives little current excitation load blocks as excitation, making little current excitation load blocks introduce a frequency that power supply is applied disturbance at the load end of tested power supply is the sine-wave current load of ω; Is the amplitude and the phase place of the voltage signal of ω through test frequency voltage phasor extraction module from the frequency that the voltage sample end on the testing section extracts tested both ends of power; Is amplitude and the phase place of the current signal of ω from the power source bus extraction through the frequency that testing section flows to tested power supply through test frequency electric current phasor extraction module, is sent to the voltage input end and the current input terminal of frequency sweep phasor analysis module respectively; Calculate the ratio and the differential seat angle of the mould of voltage phasor and electric current phasor by frequency sweep phasor analysis module; Again according to measurement result being revised in the data of the open circuit of frequencies omega, short circuit, load calibration, the range value and the phase value of the output impedance when finally drawing tested power supply at said testing section in frequencies omega; Control computer communicates through communication interface and frequency sweep phasor analysis module, the output frequency ω of control frequency sweep phasor analysis module, and the output result of receiving frequency-sweeping phasor analysis module stores and post-processed.
The step that said basis is revised measurement result in open circuit, short circuit, the data of load calibration of frequencies omega comprises:
1) tested power supply and load are all broken off from power source bus, simultaneously little current excitation load blocks is broken off from power source bus; 2) give testing section through the open circuit/short circuit/load calibration excitation signal output module output drive signal that is connected load end; 3) when the voltage sample end of testing section keeps open circuit, short circuit, connection standard termination respectively, the resistance value when measuring open circuit, short circuit, connection standard termination respectively; 4), the measurement result of tested power supply output impedance is revised according to these data.
The formula of measurement result being revised through open circuit, the measurement data of short circuit does
Z x = Z om Z sm - Z xm Z xm - Z om
Z XmMeasured value for measurand; Z OmMeasured value when opening a way for the voltage sample end maintenance of testing section;
Z SmMeasured value when keeping short circuit for the voltage sample end of testing section; Z xResistance value for revised measurand;
The method of measurement result being revised through the measurement data that connects standard termination is: the nominal value of the standard termination measured value of each frequency that records when the voltage sample end of testing section is connected standard termination and each frequency of standard termination is compared; Obtain correction factor; The final resistance value that shows was consistent with the nominal value of standard termination when this correction factor made the measurement standard load, according to this correction factor later measured value was revised.
Technique effect of the present invention:
A kind of direct supply output impedance measurement mechanism disclosed by the invention and measuring method thereof; Measured direct supply output impedance is defined in concrete working point (a definite DC voltage and the DC current of power work in rated range); Concrete testing section; Direction from testing section towards power supply is seen the equiva lent impedance that is demonstrated; During measurement; On tested power supply and power source bus that load is connected, choose testing section, said testing section between tested power supply and load towards the square section that the power supply direction is seen, the frequency that the voltage sample end from the testing section extracts tested both ends of power is the amplitude and the phase place of the voltage signal of ω; Extracting the frequency that flows to tested power supply through testing section from power source bus is the amplitude and the phase place of the current signal of ω, the system deviation of the measuring process that the measuring method that has effectively overcome prior art causes owing to the influence of load input impedance.In addition; The frequency of introducing at the load end of tested power supply that power supply is applied disturbance is the sine-wave current load of ω; The measuring method that is different from prior art initiatively is coupled to the signal source signal mode of power source bus, this sine-wave current load be equivalent to passive type to load that power is very little on the Power supply belt, from the power supply current drawn; Reach the purpose that power supply is applied disturbance; The frequency of the sine-wave current load that is applied and amplitude all are controlled, and enough little, do not influence the working point that tested power supply and load are set up.Further, also comprise the calibrating mode that measurement result is revised,, eliminate the influence of measurement mechanism self to greatest extent, be met the tested power supply output impedance value of error requirements through open circuit, short circuit, load calibration.
Description of drawings
Fig. 1 is the direct supply output impedance measuring principle figure that prior art adopts current transformer.
Fig. 2 is the direct supply output impedance measuring principle figure that prior art adopts FET.
Fig. 3 is the direct supply output impedance measuring principle figure that prior art adopts activated amplifier.
Fig. 4 is that the Agilent4395A network analyzer is measured power supply output impedance schematic diagram.
Fig. 5 is the synoptic diagram of direct supply output impedance measurement mechanism of the present invention.
Fig. 6 is a direct supply output impedance measurement mechanism calibration synoptic diagram of the present invention.
Fig. 7 is open circuit/short circuit/load calibration excitation signal output module structural drawing.
Fig. 8 is a test frequency voltage phasor extraction module structural drawing.
Fig. 9 is a low frequency test frequency electric current phasor extraction module structural drawing.
Figure 10 is a high-frequency test frequency electric current phasor extraction module structural drawing.
Figure 11 is little current excitation load blocks structural drawing.
Figure 12 is frequency sweep phasor analysis modular structure figure.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are done further explain.
As shown in Figure 5, the synoptic diagram of direct supply output impedance measurement mechanism of the present invention.A kind of direct supply output impedance measurement mechanism comprises test frequency voltage phasor extraction module, test frequency electric current phasor extraction module, little current excitation load blocks, frequency sweep phasor analysis module and control computer; Test frequency voltage phasor extraction module and test voltage input end U and the current input terminal I that frequency electric current phasor extraction module is connected frequency sweep phasor analysis module respectively; The signal output part S of frequency sweep phasor analysis module connects little current excitation load blocks, and frequency sweep phasor analysis module also is connected with control computer; Test frequency voltage phasor extraction module is connected to voltage sample end a point and the b point that connects the testing section of choosing on the power source bus of load at tested power supply; The amplitude and the phase place of the voltage signal that to extract tested both ends of power frequency be ω; Testing section between tested power supply and load towards square section ab that the power supply direction is seen; It is the amplitude and the phase place of the current signal of ω from the power source bus extraction through the frequency that testing section flows to tested power supply that test frequency electric current phasor extraction module adopts the noncontact mode; Little current excitation load blocks is connected the load end of tested power supply; Frequency through frequency sweep phasor analysis module output certain amplitude is the sinusoidal excitation signal of ω; Introducing a frequency that power supply is applied disturbance at the load end of tested power supply is the sine-wave current load of ω; Frequency sweep phasor analysis module is according to the amplitude of the voltage signal that receives and the amplitude and the phase place of phase place and current signal, the range value and the phase value of the output impedance when calculating tested power supply at said testing section in frequencies omega; The output frequency ω of control computer control frequency sweep phasor analysis module and the result of calculation of receiving frequency-sweeping phasor analysis module are stored and post-processed.
As shown in Figure 6, be the calibration synoptic diagram of direct supply output impedance measurement mechanism of the present invention.The signal output part of frequency sweep phasor analysis module also connects open circuit/short circuit/load calibration excitation signal output module; Open circuit/short circuit/load calibration excitation signal output module opening a way/be connected load end during short circuit/load calibration; Be used for all breaking off back output drive signal to testing section from power source bus in tested power supply and load and little current excitation load blocks; Make frequency sweep phasor analysis module can measure its open circuit, short circuit, connect the value of standard termination, to measurement mechanism open a way, short circuit, load calibration.The purpose of calibration is to eliminate the influence of measurement mechanism self, such as the influence of test fixture, and error of system self or the like.
As shown in Figure 7, be open circuit/short circuit/load calibration excitation signal output module structural drawing.Open circuit/short circuit/load calibration excitation signal output module comprises negative feedback operational amplifier A; The positive input terminal of operational amplifier connects the signal output part S and the delivery value of frequency sweep phasor analysis module and adds dc bias circuit through totalizer; The output terminal series diode D1 of operational amplifier; The electrode input end of diode D1 connects the voltage-limiting protection circuit, and the cathode output end of diode D1 connects voltage sample end a, the b of testing section through calibration switch.The principle of this modular circuit does; Sinusoidal signal from a test of frequency sweep phasor analysis module output frequency; Pass through the delivery value and add dc bias circuit; Carry out addition with the signal of input, synthetic signal minimum guarantees greater than the pressure drop of diode D1 not pruned in the signal bottom that is input to cross sectional testing point.Adopt the reason of this sample loading mode to be; The situation that calibration switch is forgotten disconnection appears in test process sometimes; Will cause like this opening a way, the output and the busbar voltage of short circuit, load calibration excitation signal output module directly link to each other and produce conflict, causes power supply or open circuit, short circuit, load calibration excitation signal output module to be damaged.This modular circuit adopts diode series connection output, and the diode prime adds the voltage-limiting protection circuit, can effectively protect the safety of power supply and open circuit, short circuit, load calibration excitation signal output module.
As shown in Figure 8, be test frequency voltage phasor extraction module structural drawing.Test frequency voltage phasor extraction module comprises the first capacitance C1 and the second capacitance C2 that is connected with testing section voltage sample end; The first capacitance C1 is connected the first signal input buffer circuit and secondary signal input buffer circuit respectively with the second capacitance C2; The first signal input buffer circuit is connected differential amplifier circuit more simultaneously with the secondary signal input buffer circuit, and differential amplifier circuit connects the voltage input end U of frequency sweep phasor analysis module; The voltage signal that extracts from testing section voltage sample end passes through capacitance C1, C2 filtering direct current signal; Extract the voltage signal of test frequency through input buffer circuit and differential amplifier circuit then, give the voltage input end of frequency sweep phasor analysis module.
Test frequency electric current phasor extraction module comprises low frequency test frequency electric current phasor extraction module and high-frequency test frequency electric current phasor extraction module; The frequency range that low frequency test frequency electric current phasor extraction module is suitable for is 10Hz~1MHz, and high-frequency test frequency electric current phasor extraction module applicable scope is 10kHz~30MHz.
If the frequency of test is in the scope of 10Hz~1MHz; Adopt low-frequency ac current measurement scheme; The core of this scheme is to make current transformer with the magnet ring of a high magnetic permeability, and the magnetic core of magnet ring can be a permalloy, amorphous, high-permeability material such as nanocrystalline.Should use need one significantly on the dc bias current (50 amperes and more than) detect the alternating current by a small margin (milliampere rank and more than) of stack; Therefore in order to prevent that magnetically saturated situation from appearring in magnetic core; The current transformer of this module is except there being the secondary induction winding; Also have a direct current to compensate for winding, offset the magnetic field intensity that the DC component in the power source bus electric current produces in mutual inductor.As shown in Figure 9, be low frequency test frequency electric current phasor extraction module structural drawing.Low frequency test frequency electric current phasor extraction module comprises a current transformer of being made by the magnet ring of high magnetic permeability; Be wound with secondary induction winding and direct current on the current transformer respectively and compensate for winding; The secondary induction winding connects current-to-voltage converting circuit and signal condition and frequency compensated circuit successively; Signal condition and frequency compensated circuit connect the current input terminal I of frequency sweep phasor analysis module; Secondary induction winding role is the alternating current composition in the tested electric current of induction; Electric current in the secondary induction winding and the linear relation of the alternating current in the power source bus through current/voltage conversion, signal condition and compensating for frequency response circuit, are finally exported to frequency sweep phasor analysis module; Direct current compensates for winding and is connected the dc current measurement device with low-pass filter circuit through the DC circuit driving circuit that connects successively; The dc current measurement device becomes voltage signal to the bus current conversion of signals that records; After low-pass filter circuit filtering alternating component, compensate for the DC current of the magnetic induction density that DC current that one of winding output can offset power source bus produces again to direct current through the DC circuit driving circuit in current transformer; The effect that direct current compensates for winding is according to a certain size the DC current that provides to it; The induction level that it is produced in magnetic core equates with the induction level that the dc bias current of tested bus current produces in magnetic core; In the opposite direction; So just can guarantee that magnetic core can be not excessive and saturated because of direct current biasing, guarantee the current transformer operate as normal.The function of realization measurement power source bus DC current can be used the device that can convert DC current to DC voltage of Hall current sensor or other types; The voltage of Hall current sensor output also comprises the AC compounent that some are little except comprising and the proportional DC component of bus dc bias current; The output of Hall current sensor is through the AC compounent in the low pass filter filters out test frequency range; The signal of remaining approximate direct current; Give the direct current driven circuit; The direct current driven circuit removes to drive the DC compensation winding that a DC compensation electric current is given current transformer with this signal, the magnetic induction density that the direct current of counteracting power source bus produces in current transformer.
If the frequency of test point in the scope of 10kHz~30MHz, can adopt the high-frequency ac current measurement scheme, this scheme can select for use magnetic permeabilities such as ferrite, iron sial low relatively, and the wide magnetic core of frequency response range is made current transformer.Experiment shows selects suitable magnetic core, the secondary winding number of turn, and the influence that the direct current biasing of power source bus electric current is measured the alternating current component to current transformer is little, can not need as the direct current setoff winding of low-frequency current test.Shown in figure 10, be high-frequency test frequency electric current phasor extraction module structural drawing.High-frequency test frequency electric current phasor extraction module comprises a current transformer of being made by the magnet ring of low magnetic permeability; Be wound with the secondary induction winding on the current transformer; The secondary induction winding connects current-to-voltage converting circuit and signal condition and frequency compensated circuit successively, and signal condition and frequency compensated circuit connect the current input terminal of frequency sweep phasor analysis module.
Shown in figure 11, be little current excitation load blocks structural drawing.Little current excitation load blocks comprises negative feedback closed loop control and the driving circuit of being made up of operational amplifier A, field effect transistor Q, sample resistance R1; The positive input terminal of operational amplifier A connects the signal output part S and the delivery value circuit of frequency sweep phasor analysis module through totalizer; The output terminal of operational amplifier A connects the control utmost point of field effect transistor Q; The output stage of field effect transistor Q is connected tested positive source through current limliting with the fuse protection circuit, and another output stage connects tested power cathode through sample resistance R1.The main function of little current excitation load blocks is all controlled electric current by a small margin of output frequency and amplitude; The principle that it is realized is the conducting resistance variation through the control FET; Reach the size of current that control absorbs from power supply; What the current excitation that it is introduced adopted is a kind of pattern of passive absorption, can not cause potential damage to power source bus.The excitation that little current excitation load blocks is applied should be enough little, can not influence the working point that power supply and load are set up.The sinusoidal signal of a test of frequency sweep phasor analysis module input frequency is carried out voltage control signal that direct current biasing is arranged of addition acquisition through delivery value circuit and original signal, and its minimum value is slightly larger than zero; The control of the negative feedback closed loop system that forms through operational amplifier A, field effect transistor Q, sample resistance S1 makes voltage waveform and V on the sample resistance S1 CIdentical, so power supply output and V CIdentical current waveform.
Shown in figure 12, be frequency sweep phasor analysis modular structure figure.Frequency sweep phasor analysis module comprises digital logic device; Test frequency voltage phasor extraction module is connected digital logic device through the input signal conditioning circuit with analog to digital conversion circuit respectively successively with test frequency electric current phasor extraction module, and digital logic device is connected little current excitation load blocks or open circuit/short circuit/load calibration excitation signal output module through D/A converting circuit successively with output signal conditioning circuit; Test frequency voltage phasor extraction module is nursed one's health suitable scope through the input signal conditioning circuit respectively with the phasor of test frequency electric current phasor extraction module output; Be transformed into digital signal through high-speed A/D conversion circuit (AD), input to the digital logic device that FPGA or DSP etc. can the high speed processing digital signals; Digital logic device comprises the DDS Direct Digital formula frequency synthesis unit that is connected with clock chip; The DDS Direct Digital formula frequency synthesis unit of digital logic device the inside can output orthogonal the two-way frequency be the signal of ω, be expressed as sin (ω t) and cos (ω t); DDS Direct Digital formula frequency synthesis unit connects sine integral module and integral cosine module respectively through multiplier; The two-way frequency of DDS Direct Digital formula frequency synthesis unit output is to send into sine integral module and integral cosine module more respectively after orthogonal signal sin (ω t) and the cos (ω t) of ω multiplies each other through multiplier with voltage digital signal U (t) that inputs to digital logic device and current digital signal I (t) respectively; The sine integral module is connected phasor division arithmetic module with the integral cosine module; U (t) and I (t) multiply each other with sin (ω t) and cos (ω t) respectively; Carry out the multicycle integration then, obtain: I1=∫ U (t) * cos (ω t) dt; Q1=∫ U (t) * sin (ω t) dt; I2=∫ I (t) * cos (ω t) dt; Q2=∫ I (t) * sin (ω t) dt,
The frequency that can extract complex representation thus is voltage phasor and the electric current phasor (I1+jQ1) of ω and (I2+jQ2), the computing of being divided by through plural number, the ratio of depanning | Z| and differential seat angle θ; Phasor division arithmetic module is connected with control computer through communication interface, result of calculation is exported to control computer is stored and post-processed; DDS Direct Digital formula frequency synthesis unit is linking number analog conversion circuit and output signal conditioning circuit successively also; With the frequency that generates is that sin (ω t) signal or cos (ω t) signal of ω exported to D/A converting circuit; Through output signal conditioning circuit, as the signal output source of the signal output part S end of frequency sweep phasor analysis module; DDS Direct Digital formula frequency synthesis unit is connected with control computer through communication interface, by the output frequency of control computer control DDS Direct Digital formula frequency synthesis unit.
What direct supply output impedance measuring method of the present invention was realized is; A pair of measurand for direct supply and load formation; Measured direct supply output impedance is to be defined in concrete working point (a definite DC voltage and the DC current of power work in rated range); Concrete testing section, the direction from testing section towards power supply is seen the equiva lent impedance that is demonstrated, and has effectively overcome the system deviation of the measuring process that the influence owing to load input impedance causes.Measuring method of the present invention is; On the working point of tested power supply and load foundation; On tested power supply and power source bus that load is connected, choose testing section; Said testing section between tested power supply and load towards square section that the power supply direction is seen; The frequency of the signal output part output certain amplitude through frequency sweep phasor analysis module is that the sinusoidal signal of ω gives little current excitation load blocks as excitation, makes little current excitation load blocks introduce the sine-wave current load that frequency is ω at the load end of tested power supply, and this sine-wave current load is equivalent to controllable resistor that power is very little on the Power supply belt; From the power supply current drawn, reach the purpose that power supply is applied disturbance; Is the amplitude and the phase place of the voltage signal of ω through test frequency voltage phasor extraction module from the frequency that the voltage sample end on the testing section extracts tested both ends of power; Is amplitude and the phase place of the current signal of ω from the power source bus extraction through the frequency that testing section flows to tested power supply through test frequency electric current phasor extraction module, is sent to the voltage input end and the current input terminal of frequency sweep phasor analysis module respectively; Extract the frequency of using complex representation voltage phasor and electric current phasor by frequency sweep phasor analysis module,, calculate the ratio and the differential seat angle of the mould of voltage phasor and electric current phasor through the computing that plural number is divided by as ω; Again according to measurement result being revised in the data of the open circuit of frequencies omega, short circuit, load calibration, the range value and the phase value of the output impedance when finally drawing tested power supply at said testing section in frequencies omega; Control computer communicates through communication interface and frequency sweep phasor analysis module, the output frequency ω of control frequency sweep phasor analysis module, and the output result of receiving frequency-sweeping phasor analysis module stores and post-processed.
The step that said basis is revised measurement result in open circuit, short circuit, the data of load calibration of frequencies omega comprises; 1) tested power supply and load are all broken off from power source bus, simultaneously little current excitation load blocks is broken off from power source bus; 2) give testing section through the open circuit/short circuit/load calibration excitation signal output module output drive signal that is connected load end; 3) when the voltage sample end of testing section keeps open circuit, short circuit, connection standard termination respectively, the resistance value when measuring open circuit, short circuit, connection standard termination respectively; 4), the measurement result of tested power supply output impedance is revised according to these data.
The formula of measurement result being revised through open circuit, the measurement data of short circuit does
Z x = Z om Z sm - Z xm Z xm - Z om
Z XmMeasured value for measurand; Z OmMeasured value when opening a way for the voltage sample end maintenance of testing section; Z SmMeasured value when keeping short circuit for the voltage sample end of testing section; Z xResistance value for revised measurand;
The method of measurement result being revised through the measurement data that connects standard termination is: the nominal value of the standard termination measured value of each frequency that records when the voltage sample end of testing section is connected standard termination and each frequency of standard termination is compared; Obtain correction factor; The final resistance value that shows was consistent with the nominal value of standard termination when this correction factor made the measurement standard load, according to this correction factor later measured value was revised.
Should be pointed out that the above embodiment can make those skilled in the art more fully understand the invention, but do not limit the present invention in any way creation.Therefore, although this instructions and embodiment have carried out detailed explanation to the invention,, it will be appreciated by those skilled in the art that still and can make amendment or be equal to replacement the invention; And all do not break away from the technical scheme and the improvement thereof of the spirit and scope of the present invention, and it all is encompassed in the middle of the protection domain of the invention patent.

Claims (10)

1. a direct supply output impedance measurement mechanism is characterized in that, comprises test frequency voltage phasor extraction module, test frequency electric current phasor extraction module, little current excitation load blocks, frequency sweep phasor analysis module and control computer; Said test frequency voltage phasor extraction module and test frequency electric current phasor extraction module are connected the voltage input end and the current input terminal of frequency sweep phasor analysis module respectively; The signal output part of said frequency sweep phasor analysis module connects little current excitation load blocks, and said frequency sweep phasor analysis module also is connected with control computer; Said test frequency voltage phasor extraction module is connected to the voltage sample end that connects the testing section of choosing on the power source bus of load at tested power supply; The amplitude and the phase place of the voltage signal that to extract tested both ends of power frequency be ω; Said testing section between tested power supply and load towards square section that the power supply direction is seen; It is the amplitude and the phase place of the current signal of ω from the power source bus extraction through the frequency that testing section flows to tested power supply that said test frequency electric current phasor extraction module adopts the noncontact mode; Said little current excitation load blocks is connected the load end of tested power supply; Frequency through said frequency sweep phasor analysis module output certain amplitude is the sinusoidal excitation signal of ω; Introducing a frequency that power supply is applied disturbance at the load end of tested power supply is the sine-wave current load of ω; Said frequency sweep phasor analysis module is according to the amplitude of the voltage signal that receives and the amplitude and the phase place of phase place and current signal, the range value and the phase value of the output impedance when calculating tested power supply at said testing section in frequencies omega; The output frequency ω of control computer control frequency sweep phasor analysis module and the result of calculation of receiving frequency-sweeping phasor analysis module are stored and post-processed.
2. direct supply output impedance measurement mechanism according to claim 1; It is characterized in that; The signal output part of said frequency sweep phasor analysis module also connects open circuit/short circuit/load calibration excitation signal output module; Said open circuit/short circuit/load calibration excitation signal output module opening a way/be connected load end during short circuit/load calibration, be used for all breaking off afterwards the output drive signal to testing section from power source bus in tested power supply and load and little current excitation load blocks; Said open circuit/short circuit/load calibration excitation signal output module comprises negative feedback operational amplifier; The positive input terminal of operational amplifier connects the signal output part and the delivery value of frequency sweep phasor analysis module and adds dc bias circuit through totalizer; The output terminal series diode of operational amplifier; The electrode input end of diode connects the voltage-limiting protection circuit, and the cathode output end of diode connects the voltage sample end of testing section through calibration switch.
3. direct supply output impedance measurement mechanism according to claim 1 and 2; It is characterized in that; Said test frequency voltage phasor extraction module comprises first capacitance and second capacitance that is connected with testing section voltage sample end; First capacitance is connected the first signal input buffer circuit and secondary signal input buffer circuit respectively with second capacitance; The first signal input buffer circuit is connected differential amplifier circuit more simultaneously with the secondary signal input buffer circuit, and differential amplifier circuit connects the voltage input end of frequency sweep phasor analysis module.
4. direct supply output impedance measurement mechanism according to claim 1 and 2; It is characterized in that; Said test frequency electric current phasor extraction module comprises low frequency test frequency electric current phasor extraction module; Said low frequency test frequency electric current phasor extraction module comprises a current transformer of being made by the magnet ring of high magnetic permeability; Be wound with secondary induction winding and direct current on the said current transformer respectively and compensate for winding, said secondary induction winding connects current-to-voltage converting circuit and signal condition and frequency compensated circuit successively, and signal condition and frequency compensated circuit connect the current input terminal of frequency sweep phasor analysis module; Said direct current compensates for winding and is connected the dc current measurement device with low-pass filter circuit through the DC circuit driving circuit that connects successively; Said dc current measurement device becomes voltage signal to the bus current conversion of signals that records; After low-pass filter circuit filtering alternating component, compensate for the DC current of the magnetic induction density that DC current that one of winding output can offset power source bus produces again to direct current through the DC circuit driving circuit in current transformer.
5. direct supply output impedance measurement mechanism according to claim 1 and 2; It is characterized in that; Said test frequency electric current phasor extraction module comprises high-frequency test frequency electric current phasor extraction module; Said high-frequency test frequency electric current phasor extraction module comprises a current transformer of being made by the magnet ring of low magnetic permeability; Be wound with the secondary induction winding on the said current transformer, said secondary induction winding connects current-to-voltage converting circuit and signal condition and frequency compensated circuit successively, and signal condition and frequency compensated circuit connect the current input terminal of frequency sweep phasor analysis module.
6. direct supply output impedance measurement mechanism according to claim 1 and 2; It is characterized in that; Said little current excitation load blocks comprises negative feedback closed loop control and the driving circuit of being made up of operational amplifier, field effect transistor, sample resistance; The positive input terminal of operational amplifier connects the signal output part and the delivery value circuit of frequency sweep phasor analysis module through totalizer; The output terminal of operational amplifier connects the control utmost point of field effect transistor, and an output stage of field effect transistor is connected tested positive source through current limliting with the fuse protection circuit, and another output stage connects tested power cathode through sample resistance.
7. direct supply output impedance measurement mechanism according to claim 1 and 2; It is characterized in that; Said frequency sweep phasor analysis module comprises digital logic device; Said test frequency voltage phasor extraction module is connected said digital logic device through the input signal conditioning circuit respectively successively with test frequency electric current phasor extraction module with analog to digital conversion circuit, said digital logic device is connected said little current excitation load blocks or open circuit/short circuit/load calibration excitation signal output module through D/A converting circuit successively with output signal conditioning circuit; Said digital logic device comprises the DDS Direct Digital formula frequency synthesis unit that is connected with clock chip; Said DDS Direct Digital formula frequency synthesis unit connects sine integral module and integral cosine module respectively through multiplier; The two-way frequency of DDS Direct Digital formula frequency synthesis unit output is to send into sine integral module and integral cosine module more respectively after orthogonal signal sin (ω t) and the cos (ω t) of ω multiplies each other with voltage digital signal U (t) that inputs to digital logic device and current digital signal I (t) respectively; Said sine integral module is connected phasor division arithmetic module with the integral cosine module, said phasor division arithmetic module is connected with control computer through communication interface; Said DDS Direct Digital formula frequency synthesis unit also connects said D/A converting circuit, is that sin (ω t) signal or cos (ω t) signal of ω exported to D/A converting circuit with the frequency that generates; Said DDS Direct Digital formula frequency synthesis unit is connected with control computer through communication interface, by the output frequency of control computer control DDS Direct Digital formula frequency synthesis unit.
8. direct supply output impedance measuring method; It is characterized in that; Set up the working point of tested power supply and load; On tested power supply and power source bus that load is connected, choose testing section; Said testing section between tested power supply and load towards the square section that the power supply direction is seen, the frequency of the output terminal output certain amplitude through frequency sweep phasor analysis module is that the sinusoidal signal of ω gives little current excitation load blocks as excitation, making little current excitation load blocks introduce a frequency that power supply is applied disturbance at the load end of tested power supply is the sine-wave current load of ω; Is the amplitude and the phase place of the voltage signal of ω through test frequency voltage phasor extraction module from the frequency that the voltage sample end on the testing section extracts tested both ends of power; Is amplitude and the phase place of the current signal of ω from the power source bus extraction through the frequency that testing section flows to tested power supply through test frequency electric current phasor extraction module, is sent to the voltage input end and the current input terminal of frequency sweep phasor analysis module respectively; Calculate the ratio and the differential seat angle of the mould of voltage phasor and electric current phasor by frequency sweep phasor analysis module; Again according to measurement result being revised in the data of the open circuit of frequencies omega, short circuit, load calibration, the range value and the phase value of the output impedance when finally drawing tested power supply at said testing section in frequencies omega; Control computer communicates through communication interface and frequency sweep phasor analysis module, the output frequency ω of control frequency sweep phasor analysis module, and the output result of receiving frequency-sweeping phasor analysis module stores and post-processed.
9. direct supply output impedance measuring method according to claim 8 is characterized in that, the step that said basis is revised measurement result in open circuit, short circuit, the data of load calibration of frequencies omega comprises:
1) tested power supply and load are all broken off from power source bus, simultaneously little current excitation load blocks is broken off from power source bus; 2) give testing section through the open circuit/short circuit/load calibration excitation signal output module output drive signal that is connected load end; 3) when the voltage sample end of testing section keeps open circuit, short circuit, connection standard termination respectively, the resistance value when measuring open circuit, short circuit, connection standard termination respectively; 4), the measurement result of tested power supply output impedance is revised according to these data.
10. direct supply output impedance measuring method according to claim 9 is characterized in that, the formula of measurement result being revised through open circuit, the measurement data of short circuit does
Z x = Z om Z sm - Z xm Z xm - Z om
Z XmMeasured value for measurand; Z OmMeasured value when opening a way for the voltage sample end maintenance of testing section; Z SmMeasured value when keeping short circuit for the voltage sample end of testing section; Z xResistance value for revised measurand;
The method of measurement result being revised through the measurement data that connects standard termination is: the nominal value of the standard termination measured value of each frequency that records when the voltage sample end of testing section is connected standard termination and each frequency of standard termination is compared; Obtain correction factor; The final resistance value that shows was consistent with the nominal value of standard termination when this correction factor made the measurement standard load, according to this correction factor later measured value was revised.
CN201210337296.7A 2012-09-12 2012-09-12 Measuring device and method for direct current supply output impedance Active CN102841258B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201210337296.7A CN102841258B (en) 2012-09-12 2012-09-12 Measuring device and method for direct current supply output impedance

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201210337296.7A CN102841258B (en) 2012-09-12 2012-09-12 Measuring device and method for direct current supply output impedance

Publications (2)

Publication Number Publication Date
CN102841258A true CN102841258A (en) 2012-12-26
CN102841258B CN102841258B (en) 2015-05-20

Family

ID=47368801

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201210337296.7A Active CN102841258B (en) 2012-09-12 2012-09-12 Measuring device and method for direct current supply output impedance

Country Status (1)

Country Link
CN (1) CN102841258B (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104297597A (en) * 2014-10-20 2015-01-21 中国电子科技集团公司第四十一研究所 New method for testing clamp effect in dual-port-removed network
CN104362619A (en) * 2014-10-21 2015-02-18 深圳大学 Obtaining method of driving components of mean square currents of branch circuits in alternating current power grid
CN104457971A (en) * 2014-11-21 2015-03-25 西安交通大学 Frequency scanning test method for noise prediction of power capacitor
CN105425045A (en) * 2015-12-08 2016-03-23 云南电力试验研究院(集团)有限公司 Ferromagnetic element leakage reactance measuring method based on simplified model
CN106990381A (en) * 2017-06-02 2017-07-28 国网江苏省电力公司宿迁供电公司 A kind of transformer magnetic saturation detection means
CN108234369A (en) * 2016-12-14 2018-06-29 奉加微电子(上海)有限公司 A kind of method and device of cancellation of DC offset
CN109142871A (en) * 2018-10-23 2019-01-04 西安微电子技术研究所 A kind of linear stabilized power supply AC output impedance test circuit and method
CN110618319A (en) * 2019-10-09 2019-12-27 西南交通大学 Device for measuring dq impedance of electric locomotive and control method thereof
CN111505439A (en) * 2020-04-21 2020-08-07 国网江苏省电力有限公司电力科学研究院 Impedance frequency sweeping device for direct current system, control method thereof and storage medium
CN111505358A (en) * 2020-04-30 2020-08-07 常州市致新精密电子有限公司 Inductor direct current bias current source test equipment
CN111722044A (en) * 2020-06-29 2020-09-29 国网山东省电力公司电力科学研究院 Direct current charging pile testing method, device and equipment based on frequency sweep calibration shunt

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3690455B1 (en) * 2019-01-31 2022-03-16 Ingersoll-Rand Industrial U.S., Inc. Apparatus for measuring an impedance of load

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5494221A (en) * 1978-01-10 1979-07-25 Nec Corp Output impedance measuring method of facsimile transceiver
JPH06138162A (en) * 1992-10-28 1994-05-20 Fujitsu Denso Ltd Judging method and device for stability of power source device
JPH07159459A (en) * 1993-12-10 1995-06-23 N F Kairo Sekkei Block:Kk Impedance measuring instrument
US5587662A (en) * 1995-02-10 1996-12-24 North Carolina State University Method and apparatus for nondisruptively measuring line impedance at frequencies which are relatively close to the line frequency
EP1795907A1 (en) * 2005-11-25 2007-06-13 RAI RADIOTELEVISIONE ITALIANA S.p.A. An impulsive impedance meter for electric power systems
US20090187367A1 (en) * 2008-01-18 2009-07-23 Kao Hung-Hsiang Electronic load device for power supply product to be tested and method for regulating bandwidth thereof
CN101858940A (en) * 2009-04-07 2010-10-13 中茂电子(深圳)有限公司 Output impedance measuring method and device
CN202837406U (en) * 2012-09-12 2013-03-27 北京东方计量测试研究所 DC power supply output impedance measuring device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5494221A (en) * 1978-01-10 1979-07-25 Nec Corp Output impedance measuring method of facsimile transceiver
JPH06138162A (en) * 1992-10-28 1994-05-20 Fujitsu Denso Ltd Judging method and device for stability of power source device
JPH07159459A (en) * 1993-12-10 1995-06-23 N F Kairo Sekkei Block:Kk Impedance measuring instrument
US5587662A (en) * 1995-02-10 1996-12-24 North Carolina State University Method and apparatus for nondisruptively measuring line impedance at frequencies which are relatively close to the line frequency
EP1795907A1 (en) * 2005-11-25 2007-06-13 RAI RADIOTELEVISIONE ITALIANA S.p.A. An impulsive impedance meter for electric power systems
US20090187367A1 (en) * 2008-01-18 2009-07-23 Kao Hung-Hsiang Electronic load device for power supply product to be tested and method for regulating bandwidth thereof
CN101858940A (en) * 2009-04-07 2010-10-13 中茂电子(深圳)有限公司 Output impedance measuring method and device
CN202837406U (en) * 2012-09-12 2013-03-27 北京东方计量测试研究所 DC power supply output impedance measuring device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
刘民等: "直流电源输出阻抗测量技术", 《宇航计测技术》, vol. 30, no. 5, 30 October 2010 (2010-10-30), pages 18 - 22 *
崔立冬: "直流电源系统阻抗计算方法及仿真软件研究", 《直流电源系统阻抗计算方法及仿真软件研究",崔立冬,中国优秀硕士学位论文全文数据库(信息科技辑)》, no. 5, 15 May 2012 (2012-05-15), pages 38 - 49 *

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104297597B (en) * 2014-10-20 2017-01-18 中国电子科技集团公司第四十一研究所 New method for testing clamp effect in dual-port-removed network
CN104297597A (en) * 2014-10-20 2015-01-21 中国电子科技集团公司第四十一研究所 New method for testing clamp effect in dual-port-removed network
CN104362619A (en) * 2014-10-21 2015-02-18 深圳大学 Obtaining method of driving components of mean square currents of branch circuits in alternating current power grid
CN104457971A (en) * 2014-11-21 2015-03-25 西安交通大学 Frequency scanning test method for noise prediction of power capacitor
CN104457971B (en) * 2014-11-21 2018-01-19 西安交通大学 A kind of frequency sweep test method for power capacitor noise prediction
CN105425045B (en) * 2015-12-08 2018-06-15 云南电力试验研究院(集团)有限公司 A kind of ferromagnetic element leakage reactance measuring method based on simplified model
CN105425045A (en) * 2015-12-08 2016-03-23 云南电力试验研究院(集团)有限公司 Ferromagnetic element leakage reactance measuring method based on simplified model
CN108234369A (en) * 2016-12-14 2018-06-29 奉加微电子(上海)有限公司 A kind of method and device of cancellation of DC offset
CN108234369B (en) * 2016-12-14 2020-11-03 奉加微电子(上海)有限公司 Method and device for eliminating direct current offset
CN106990381A (en) * 2017-06-02 2017-07-28 国网江苏省电力公司宿迁供电公司 A kind of transformer magnetic saturation detection means
CN106990381B (en) * 2017-06-02 2020-02-04 国网江苏省电力公司宿迁供电公司 Mutual inductor magnetic saturation detection device
CN109142871A (en) * 2018-10-23 2019-01-04 西安微电子技术研究所 A kind of linear stabilized power supply AC output impedance test circuit and method
CN109142871B (en) * 2018-10-23 2021-11-30 西安微电子技术研究所 Linear voltage-stabilized power supply alternating current output impedance test circuit and method
CN110618319A (en) * 2019-10-09 2019-12-27 西南交通大学 Device for measuring dq impedance of electric locomotive and control method thereof
CN111505439A (en) * 2020-04-21 2020-08-07 国网江苏省电力有限公司电力科学研究院 Impedance frequency sweeping device for direct current system, control method thereof and storage medium
CN111505358A (en) * 2020-04-30 2020-08-07 常州市致新精密电子有限公司 Inductor direct current bias current source test equipment
CN111505358B (en) * 2020-04-30 2022-06-14 常州市致新精密电子有限公司 Inductor direct current bias current source test equipment
CN111722044A (en) * 2020-06-29 2020-09-29 国网山东省电力公司电力科学研究院 Direct current charging pile testing method, device and equipment based on frequency sweep calibration shunt

Also Published As

Publication number Publication date
CN102841258B (en) 2015-05-20

Similar Documents

Publication Publication Date Title
CN102841258B (en) Measuring device and method for direct current supply output impedance
CN202837406U (en) DC power supply output impedance measuring device
CN106574950B (en) Power pack with fluxgate detector
CN103207379B (en) Method and device for measuring direct current magnetic bias error characteristics of current transformer
AU2014247351B2 (en) Method and device for testing a transformer
CN103235170B (en) Differential D-dot voltage sensor
US10436821B2 (en) Apparatus for detecting AC components in a DC circuit and use of the apparatus
CN101846699A (en) Electrical parameter measuring device, system and method
CN105093140A (en) Transformer remanence detection and demagnetization method and device
CN104749537A (en) Hysteresis loop measuring method of current transformer
CN203590195U (en) Improved simulation integrating circuit based on PCB Rogowski coil current transformer
Schmidt et al. A simple method to determine dynamic hysteresis loops of soft magnetic materials
CN102654571A (en) Comprehensive tester of current transformer
CN104730485A (en) GIS type current transformer test method
Kaczmarek et al. Reference voltage divider designed to operate with oscilloscope to enable determination of ratio error and phase displacement frequency characteristics of MV voltage transformers
CN204439713U (en) Based on the hollow coil current transformer of Novel DC isolation integrator
Niklaus et al. High-Bandwidth High-CMRR Current Measurement for a 4.8 MHz Multi-Level GaN Inverter AC Power Source
CN203287514U (en) Current transformer DC magnetic bias error characteristic measuring device
CN102832922B (en) High-precise and high-synchronous novel analog signal distributor
Wang et al. Nonlinear behavior immunity modeling of an LDO voltage regulator under conducted EMI
CN105353194A (en) Voltage sampling device of three phase neutral point non-grounding system
CN112816769A (en) Current and voltage combined data acquisition device
Crotti et al. Frequency calibration of voltage transformers by digital capacitance bridge
CN103339515B (en) For the method and apparatus of linearization transformer
Coenen et al. Conducted mains test method in 2–150 kHz band

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant