CN106291123B - A kind of method directly measuring magnetic cell winding loss - Google Patents
A kind of method directly measuring magnetic cell winding loss Download PDFInfo
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- CN106291123B CN106291123B CN201610635858.4A CN201610635858A CN106291123B CN 106291123 B CN106291123 B CN 106291123B CN 201610635858 A CN201610635858 A CN 201610635858A CN 106291123 B CN106291123 B CN 106291123B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2688—Measuring quality factor or dielectric loss, e.g. loss angle, or power factor
- G01R27/2694—Measuring dielectric loss, e.g. loss angle, loss factor or power factor
Abstract
The invention discloses a kind of methods for directly measuring magnetic cell winding loss, magnetic cell includes magnetic core and winding, increase by one auxiliary winding of coiling on the magnetic core of magnetic cell, and auxiliary winding is opened a way, apply excitation source to magnetic cell, the voltage relationship between the tested winding and auxiliary winding port of magnetic cell is measured by measuring instrument, and flow through the electric current of tested winding, voltage between port is subjected to calculation processing and obtains the voltage of tested winding loss, the power of tested winding is calculated, is exactly the loss of tested winding.Present invention may apply to measure the winding loss of any magnetic cell under any excitation waveform operating condition, it can also be used to the winding loss of magnetic cell in on-line measurement power inverter.The influence of magnetic field in magnetic cell, temperature and actual condition to winding loss can not only be embodied, also can measure the loss of each winding in Multiple coil magnetic cell.It realizes and isolates winding loss from total losses, measure convenient, fast, at low cost.
Description
Technical field
The present invention relates to electric power, power electronic equipment field, more particularly to one kind directly to measure magnetic cell winding loss
Method.
Background technique
Magnetic cell is responsible for the functions such as the transmitting, storage, filtering of magnetic energy, plays pole in electric system, power inverter
Its important role, as power inverter is toward high frequency and high power density trend development, magnetic cell is worn to its hair of restriction
One of key factor of exhibition.Other than basic electric parameter requirement to be met, loss also has become magnetic cell and sets magnetic cell
The critical issue of meter, because the loss of magnetic cell has occupied a big chunk of power inverter total-power loss.Especially
For the energy efficiency indexes of power inverter, the total losses for not requiring nothing more than magnetic cell want small, it is also necessary under the conditions of considering different loads
The ratio of core loss and winding loss, to guarantee the green energy conservation rule under the conditions of power inverter complete machine is able to satisfy different loads
Model, therefore the loss characteristic of research and analysis magnetic cell in detail is of great significance.
Magnetic cell is generally made of magnetic core and winding, and loss contains core loss and winding loss, due to magnetic cell
Middle core loss and winding loss are difficult to separate in itself as both two parts losses in a component, there is presently no
A kind of effective direct measurement appraisal procedure that can measure magnetic cell winding under given excitation operating condition, and can directly measure power
The On-line Measuring Method of magnetic cell winding loss in converter.
In the measurement method of existing magnetic cell winding loss, the general AC resistance by measuring magnetic cell winding is indirect
Obtain the winding loss of magnetic cell.For transformer, winding short circuit mensuration is generally used, due to winding short circuit, core flux
It is substantially zeroed, therefore total AC resistance that measurement obtains is exactly winding AC resistance.For there is the magnetic cell of air gap, if any air gap
Inductor, can using air gap equivalent winding magnetomotive force substitution air gap magnetic pressure drop method to the AC resistance of inductor winding into
Row measurement calculates in the relationship by loss and AC resistance and obtains winding loss.It is this indirectly by measurement magnetic cell winding
The method that the method for AC resistance obtains winding loss can not embody electromagnetic field, temperature and actual condition to winding loss
It influences；Meanwhile this measurement method also can not measure assessment to the winding loss in all types transformer and inductance；Separately
Outside, for the magnetic cell of Multiple coil situation, what is measured is the total losses of primary and secondary winding, be unable to get it is therein some around
Group loss.
In the direct measuring method of existing magnetic cell winding loss, also just for certain type of magnetic cell, measurement essence
Degree influenced by measuring circuit or the component of introducing, and cannot achieve in power inverter magnetic cell winding loss
Line measurement.
There is a kind of measurement method for measuring flat surface transformer winding loss in the art, increases by one in flat surface transformer
Auxiliary winding is simultaneously opened a way, and applies PWM wave excitation to the primary side of flat surface transformer, secondary side connects the load electricity of a low inductance value
Resistance, by the voltage and the resistance value of load resistance at measurement auxiliary winding both ends and load resistance both ends, secondary side winding with it is auxiliary
The turn ratio n for helping side winding obtains the equivalent electric group that secondary side winding under the operating condition is lost further according to the formula derived, and uses
Threedimensional FEM software verifies measurement method.The measurement method considers in transformer magnetic field to winding
The influence situation of loss overcomes winding loss to a certain extent and is difficult to the problem of directly separating from transformer.But
This method is influenced very big by load resistance, i.e., the stability of load resistance resistance value, distributed inductance and frequency characteristic etc. can be serious
Measurement result is influenced, the inventor of this method is also proposed with the resistance of low inductance value as load resistance thus, and uses
Impedance analyzer is calibrated load resistance to obtain accurate resistance value and phase response.In addition, the measurement method only can
To measure through the winding loss under given excitation waveform operating condition, power inverter under real meaning operating condition still cannot achieve
The on-line measurement of middle magnetic cell winding loss.
Summary of the invention
The purpose of the present invention realizes the precise measurement of winding loss, realizes to magnetic member under given any excitation waveform operating condition
The measurement of the winding loss of part；Realize the on-line measurement of winding loss；The each winding damage of any magnetic cell can also be realized simultaneously
The measurement of consumption.
For achieving the above object, the technical scheme is that a kind of side for directly measuring magnetic cell winding loss
Method, magnetic cell include magnetic core and winding, increase by one auxiliary winding of coiling on the magnetic core of magnetic cell, and auxiliary winding is opened
Road applies excitation source to magnetic cell, the electricity between the tested winding and auxiliary winding port of magnetic cell is measured by measuring instrument
Pressure relationship, and the electric current of tested winding is flowed through, the voltage between port is subjected to calculation processing and obtains tested winding loss
The power of tested winding is calculated in voltage, is exactly the loss of tested winding.
As a kind of selection of the invention, when measuring winding loss of the magnetic cell under high frequency operating condition, auxiliary winding and quilt
Survey winding double winding and around mode carry out coiling.
As another kind selection of the invention, when measuring winding loss of the magnetic cell under high frequency operating condition, auxiliary winding and
Tested winding technique is on different magnetic core positions.
Preferably as one kind of the invention, the measuring instrument is oscillograph or level instrumentation, measurement result difference
For voltage, electric current or power.
Preferably as another kind of the invention, the excitation source is external given excitation source, including signal generator and function
Rate amplifier.
Preferably as another kind of the invention, the excitation source is the practical excitation waveform at magnetic cell both ends.
The beneficial effects of the present invention are:
The method that the present invention directly measures winding loss can be adapted for measuring any magnetic member under any excitation waveform operating condition
The winding loss of part, it can also be used to the winding loss of magnetic cell in on-line measurement power inverter.The result of measurement method is not only
The influence of magnetic field in magnetic cell, temperature and actual condition to winding loss can be embodied, also can measure every in Multiple coil magnetic cell
The loss of a winding.It realizes and isolates winding loss from total losses, also providing one kind for the optimization design of magnetic cell has
The direct measurement appraisal procedure of effect measures convenient, fast, at low cost.
Detailed description of the invention
Winding loss measurement equivalent circuit diagram when Fig. 1 is tested inductor winding and the auxiliary winding turn ratio is 1；
Winding loss measurement equivalent circuit diagram when Fig. 2 is tested inductor winding and the auxiliary winding turn ratio is non-1；
Tested transformer primary winding loss when Fig. 3 is tested transformer primary winding and the auxiliary winding turn ratio is 1
Measure equivalent circuit diagram；
Tested Circuit Fault on Secondary Transformer winding loss when Fig. 4 is tested transformer primary winding and the auxiliary winding turn ratio is 1
Measure equivalent circuit diagram；
Fig. 5 is tested tested transformer primary winding loss when transformer primary winding and the auxiliary winding turn ratio are non-1
Measure equivalent circuit diagram；
Tested Circuit Fault on Secondary Transformer winding damage when Fig. 6 is tested transformer primary winding and the auxiliary winding turn ratio is non-1
Consumption measurement equivalent circuit diagram；
Fig. 7 is the excitation winding of tested inductance and auxiliary winding position is staggered coiling schematic diagram；
Fig. 8 is the excitation winding of tested transformer and auxiliary winding position is staggered coiling schematic diagram.
Specific embodiment
Below in conjunction with attached drawing, technical scheme in the embodiment of the invention is clearly and completely described.
It is tested when for tested inductor winding and auxiliary winding turn ratio n being 1 as shown in Figure 1, the first embodiment of the present invention
The measurement of inductor winding loss.The survey of tested inductor winding loss when for tested inductor winding and auxiliary winding turn ratio n being 1
Amount.Excitation source can be made of signal generator and power amplifier, be also possible to magnetic cell both ends in actual power converter
Practical excitation waveform；L is tested inductance, wherein RwFor the equivalent resistance for being tested inductor winding, the winding damage of inductance is embodied
Consumption, RcFor the equivalent resistance for embodying tested inductance core loss, LmFor the magnetizing inductance for being tested inductance, LauxFor auxiliary winding, end
Son 1 and terminal 2 be two pins of tested inductance L, and terminal 3 and terminal 4 are two pins of auxiliary winding, when measurement assist around
Group open circuit；Measuring instrument can use oscilloscope measurement voltage, electric current or power, can also use level instrumentation.Pass through
The voltage u at 3 both ends of measurement terminal 1 and terminal3(t), and the electric current i of tested inductance is flowed through1(t), it can be obtained according to formula (1)
The winding loss of inductance L must be tested.
As shown in Fig. 2, the second embodiment of the present invention, quilt when for tested inductor winding and auxiliary winding turn ratio n being non-1
Survey the measurement of inductor winding loss.Excitation source can be made of signal generator and power amplifier, be also possible to actual power
The practical excitation waveform at magnetic cell both ends in converter；L is tested inductance, wherein RwFor be tested inductor winding equivalent resistance,
Embody the winding loss of inductance, RcFor the equivalent resistance for embodying tested inductance core loss, LmFor the excitation electricity for being tested inductance
Sense, LauxFor auxiliary winding, two pins that terminal 1 and terminal 2 are tested inductance L, terminal 3 and terminal 4 are the two of auxiliary winding
A pin, auxiliary winding is opened a way when measurement；Measuring instrument can use oscilloscope measurement voltage, electric current or power, can also adopt
Use level instrumentation.Pass through the voltage u at 4 both ends of measurement terminal 1 and terminal4(t), the voltage at 4 both ends of measurement terminal 3 and terminal
u2(t), and tested inductive current i is flowed through1(t), it can be obtained the winding loss of tested inductance L according to formula (2).
As shown in figure 3, the third embodiment of the present invention, for tested transformer primary winding and auxiliary winding turn ratio n2
The measurement of transformer primary winding loss is tested when being 1.Excitation source can be made of signal generator and power amplifier,
It can be the practical excitation waveform at magnetic cell both ends in actual power converter；T is tested transformer, wherein Rw1To be tested transformation
The equivalent resistance of device first side winding embodies the loss of first side winding, RcFor embody tested magnetic core of transformer loss etc.
Imitate resistance, LmFor the magnetizing inductance for being tested transformer, LauxFor auxiliary winding, terminal 1 and terminal 2 are tested transformer T primary side
Two pins of winding, Rw2For the equivalent resistance for being tested Circuit Fault on Secondary Transformer winding, the loss of secondary side winding, Z are embodiedload
For the load of transformer, terminal 3 and terminal 4 are two pins of tested transformer T secondary side winding, supplemented by terminal 5 and terminal 6
Help two pins of winding, auxiliary winding is opened a way when measurement；N1 is the turn ratio of transformer T first side winding and secondary side winding,
N2 is transformer T first side winding and the turn ratio with secondary side winding；Measuring instrument can use oscilloscope measurement voltage, electric current
Or power, level instrumentation can also be used.Pass through the voltage u at 5 both ends of measurement terminal 1 and terminal5(t), and flow through by
Survey the electric current i of inductance1(t), it can be obtained the loss of tested transformer T first side winding according to formula (3).
As shown in figure 4, the fourth embodiment of the present invention, for tested transformer primary winding and auxiliary winding turn ratio n3
The measurement of Circuit Fault on Secondary Transformer winding loss is tested when being 1.Excitation source can be made of signal generator and power amplifier,
It can be the practical excitation waveform at magnetic cell both ends in actual power converter；T is tested transformer, wherein Rw1To be tested transformation
The equivalent resistance of device first side winding embodies the loss of first side winding, RcFor embody tested magnetic core of transformer loss etc.
Imitate resistance, LmFor the magnetizing inductance for being tested transformer, LauxFor auxiliary winding, terminal 1 and terminal 2 are tested transformer T primary side
Two pins of winding, Rw2For the equivalent resistance for being tested Circuit Fault on Secondary Transformer winding, the loss of secondary side winding, Z are embodiedload
For the load of transformer, terminal 3 and terminal 4 are two pins of tested transformer T secondary side winding, supplemented by terminal 5 and terminal 6
Help two pins of winding, auxiliary winding is opened a way when measurement；N1 is the turn ratio of transformer T first side winding and secondary side winding,
N2 is transformer T first side winding and the turn ratio with secondary side winding, and n3 is transformer T secondary side winding and secondary side winding
The turn ratio；Measuring instrument can use oscilloscope measurement voltage, electric current or power, can also use level instrumentation.Pass through survey
Measure the voltage u of terminal 3 and 5 both ends of terminal6(t), and the electric current i of tested inductance is flowed through2(t), it can be obtained according to formula (4)
The winding loss of tested transformer T secondary side.
As shown in figure 5, the fifth embodiment of the present invention, for tested transformer primary winding and auxiliary winding turn ratio n2
The measurement of transformer primary winding loss is tested when being non-1.Excitation source can be made of signal generator and power amplifier,
It is also possible to the practical excitation waveform at magnetic cell both ends in actual power converter；T is tested transformer, wherein Rw1Become to be tested
The equivalent resistance of depressor first side winding embodies the loss of first side winding, RcTo embody tested magnetic core of transformer loss
Equivalent resistance, LmFor the magnetizing inductance for being tested transformer, LauxFor auxiliary winding, terminal 1 and terminal 2 are that tested transformer T is primary
Two pins of side winding, Rw2For the equivalent resistance for being tested Circuit Fault on Secondary Transformer winding, the loss of secondary side winding is embodied,
ZloadFor the load of transformer, terminal 3 and terminal 4 are two pins for being tested transformer T secondary side winding, terminal 5 and terminal 6
For two pins of auxiliary winding, auxiliary winding is opened a way when measurement；N1 is the circle of transformer T first side winding and secondary side winding
Than n2 is transformer T first side winding and the turn ratio with secondary side winding；Measuring instrument can using oscilloscope measurement voltage,
Electric current or power can also use level instrumentation.Pass through the voltage u at 6 both ends of measurement terminal 1 and terminal7(t), measurement end
The voltage u of son 5 and 6 both ends of terminal2(t), and the electric current i of tested inductance is flowed through1(t), it can be obtained according to formula (5) tested
The loss of transformer T first side winding.
As shown in fig. 6, the sixth embodiment of the present invention, for tested transformer primary winding and auxiliary winding turn ratio n3
The measurement of Circuit Fault on Secondary Transformer winding loss is tested when being non-1.Excitation source can be made of signal generator and power amplifier,
It is also possible to the practical field wave excitation at magnetic cell both ends in actual power converter；T is tested transformer, wherein Rw1It is tested
The equivalent resistance of transformer primary winding, RcFor the equivalent resistance for being tested magnetic core of transformer loss, LmTo be tested encouraging for transformer
Magnetoelectricity sense, LauxFor auxiliary winding, terminal 1 and terminal 2 are two pins for being tested transformer T first side winding, Rw2Become to be tested
The equivalent resistance of depressor secondary side winding, ZloadFor the load of transformer, terminal 3 and terminal 4 be tested transformer T secondary side around
Two pins of group, terminal 5 and terminal 6 are two pins of auxiliary winding, auxiliary winding open circuit；N1 is transformer T primary side
The turn ratio of winding and secondary side winding, n2 are transformer T first side winding and the turn ratio with secondary side winding, and n3 is transformer T
The turn ratio of secondary side winding and secondary side winding；Measuring instrument can use oscilloscope measurement voltage, electric current or power, can also be with
Using level instrumentation.Pass through the voltage u at 4 both ends of measurement terminal 3 and terminal8(t), the electricity at 6 both ends of measurement terminal 5 and terminal
Press u2(t) and tested inductive current i2(t), it can be obtained the winding loss of tested transformer T secondary side according to formula (6).
Since kindred effect of the magnetic cell under high frequency excitation between excitation winding and auxiliary winding influences whether measurement knot
Fruit, the present invention carry out coiling to auxiliary winding using two schemes.First, auxiliary winding uses litz wire and excitation winding simultaneously
Around, i.e., auxiliary winding use litz wire, be tested the simultaneously coiling in parallel with auxiliary winding of magnetic cell winding, the program may insure by
The excitation winding for surveying magnetic cell is identical as the number of turns of auxiliary winding, and unity couping, the vortex of litz wire within the scope of certain frequency
Very little, therefore the influence that the kindred effect of auxiliary winding can be overcome to measure tested magnetic cell winding loss using the program.
Second, the scheme being staggered using the excitation winding such as Fig. 7 and Fig. 8 with auxiliary winding position, there is no auxiliary windings for the program
Influence problem of the kindred effect to measurement result, therefore the auxiliary winding in the program is without litz wire, and use common
Line carries out coiling.
Fig. 7 is the excitation winding and auxiliary winding L of tested inductance LauxThe scheme that position is staggered, auxiliary winding LauxIt is wound on
On the magnetic core of tested inductance L, and position is staggered with excitation winding.
Fig. 8 is the excitation winding and auxiliary winding L of tested transformer TauxThe scheme that position is staggered, auxiliary winding LauxCoiling
On the magnetic core of tested transformer T, and position is staggered with first side winding and secondary side winding.
Measurement for winding loss in Multiple coil magnetic cell, the principle and scheme are equally applicable.
The present invention is compared with the prior art that background technology part discloses, the winding loss measuring technique of background technology part
It is to increase an auxiliary winding in flat surface transformer and open a way, applies PWM wave excitation to the primary side of flat surface transformer, it is secondary
Side connects the load resistance of a low inductance value, by measuring the voltage at auxiliary winding both ends and load resistance both ends, and load
The turn ratio n of the resistance value of resistance, secondary side winding and secondary side winding, obtains secondary side under the operating condition further according to the formula derived
The equivalent electric group of winding loss, the measurement result for the transformer winding loss which obtains consider magnetic field and damage to winding
The influence of consumption, but may be only available for the measurement of transformer winding loss, it can only also realize the survey of the winding loss of given excitation source
Amount, is unable to measure the on-line measurement of magnetic cell winding loss in power inverter, in addition, shadow of the measurement method by load resistance
Sound is very big, i.e., the stability of load resistance resistance value, distributed inductance and frequency characteristic etc. can seriously affect measurement result, it is also necessary to
By calibrating method to reduce error.
Described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
Claims (5)
1. a kind of method for directly measuring magnetic cell winding loss, magnetic cell includes magnetic core and winding, which is characterized in that in magnetic member
Increase by one auxiliary winding of coiling on the magnetic core of part, and auxiliary winding is opened a way, applies excitation source to magnetic cell, pass through measuring instrument
Device measures the voltage relationship between the tested winding and auxiliary winding port of magnetic cell, and flows through the electric current of tested winding, will
Voltage between port carries out calculation processing and obtains the voltage of tested winding loss, and the power of tested winding is calculated, is exactly
The loss of tested winding；
The excitation source is the practical excitation waveform at magnetic cell both ends.
2. the method according to claim 1 for directly measuring magnetic cell winding loss, which is characterized in that measurement magnetic cell exists
When winding loss under high frequency operating condition, auxiliary winding and tested winding double winding and around mode carry out coiling.
3. the method according to claim 1 for directly measuring magnetic cell winding loss, which is characterized in that measurement magnetic cell exists
When winding loss under high frequency operating condition, auxiliary winding and tested winding technique are on different magnetic core positions.
4. the method according to claim 1 for directly measuring magnetic cell winding loss, which is characterized in that the measuring instrument
For oscillograph or level instrumentation, measurement result is respectively voltage, electric current or power.
5. the method according to claim 1 for directly measuring magnetic cell winding loss, which is characterized in that the excitation source is
The given excitation source in outside, including signal generator and power amplifier.
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| CN201610635858.4A CN106291123B (en) | 2016-08-05 | 2016-08-05 | A kind of method directly measuring magnetic cell winding loss |
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| CN201610635858.4A CN106291123B (en) | 2016-08-05 | 2016-08-05 | A kind of method directly measuring magnetic cell winding loss |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108694270B (en) * | 2018-03-27 | 2022-03-18 | 东北电力大学 | Transformer AC/DC hybrid operation excitation state-component loss mapping method |
| CN109188103B (en) * | 2018-10-12 | 2021-04-27 | 福州大学 | Method for measuring magnetic core loss based on impedance analyzer |
| CN109283399B (en) * | 2018-11-28 | 2021-03-02 | 福建工程学院 | Method for measuring loss of high-frequency magnetic element winding |
| CN110008598B (en) * | 2019-04-08 | 2022-08-12 | 南京邮电大学 | Design method of automatic resistance compensation network of high-frequency magnetic core loss test platform |
| CN111366883B (en) * | 2019-11-28 | 2021-05-14 | 横店集团东磁股份有限公司 | High-precision magnetic core loss test circuit and method |
| CN113203893B (en) * | 2021-04-29 | 2022-07-01 | 福州大学 | Inductor and method for extracting alternating current resistance of coil winding of loosely coupled transformer |
| CN113219251B (en) * | 2021-04-29 | 2023-05-12 | 南京南瑞继保电气有限公司 | Winding alternating current resistance measuring method and system |
| CN114325126B (en) * | 2022-03-04 | 2022-05-17 | 浙江富特科技股份有限公司 | Method and system for measuring winding loss of inductor |
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