CN116559543B - High-frequency transformer loss decomposition method and device based on different excitation - Google Patents
High-frequency transformer loss decomposition method and device based on different excitation Download PDFInfo
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Abstract
The disclosure belongs to the technical field of transformers, and in particular relates to a high-frequency transformer loss decomposition method and device based on different excitations, comprising the following steps: obtaining the loss type of the high-frequency transformer; introducing an eddy current loss correction coefficient and a residual loss correction coefficient under asymmetric voltage excitation, and calculating the core loss of the high-frequency transformer according to the obtained loss type of the high-frequency transformer; and (3) calculating an eddy current loss correction coefficient and a residual loss correction coefficient under the asymmetric voltage excitation of any on-time ratio by considering the change of magnetic induction intensity under the asymmetric voltage excitation of any on-time ratio, and combining the core loss and loss type of the obtained high-frequency transformer to finish the decomposition calculation of the high-frequency transformer loss under different excitation.
Description
Technical Field
The disclosure belongs to the technical field of transformers, and particularly relates to a high-frequency transformer loss decomposition method and device based on different excitations.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The magnetic element can realize the functions of current isolation, harmonic filtering, energy storage, power level parameter matching and power converter control circuit, the performance of the magnetic element generally determines the size of the converter, and with the rapid development of electronic information technology, the power supply layers of various small-sized light-weight electronic equipment are endless.
With the increasing frequency of operation, electronic devices are being miniaturized, so that selection of core materials is important, and core loss is one of characteristics of the core materials, as one of important losses affecting energy conversion and transmission efficiency, and thus core loss analysis is important.
To the inventors' knowledge, the main magnetic loss analysis methods at present can be divided into three main categories: steinometz's equation and its modification, fourier series decomposition calculation and core loss separation. The classical Steinmetz formula is the most common loss decomposition method in the core loss analysis method, but the Steinmetz formula and the improvement method thereof are only suitable for magnetic loss estimation under certain excitation conditions, have no general meaning, and simultaneously need to test corresponding coefficients for different materials, which brings difficulty to practical application of engineering industry. The relationship between the core material and the frequency in the fourier series decomposition method is not an ideal linear relationship, the core material has lost magnetism at high frequency, and since the core is a nonlinear material, the nonlinear system is processed as a linear system by adding after fourier decomposition, which itself introduces errors. According to the core loss separation theory, according to the difference of the mechanism of loss heating generated by the magnetic material under the action of an alternating magnetic field, the total loss of the core material is decomposed into superposition of loss of various components, and a calculation model can be divided into a 2-term loss model based on hysteresis and eddy current and a 3-term model based on hysteresis, eddy current and abnormal loss; the working excitation conditions of the high-frequency transformer are quite different under different topological structures, control modes and duty ratio conditions, and the resulting magnetic loss models are quite different.
Disclosure of Invention
In order to solve the above problems, the disclosure provides a method and a device for decomposing the loss of a high-frequency transformer based on different excitations, which consider voltage excitations under asymmetry, introduce eddy current loss and residual loss correction coefficients under the voltage excitations under asymmetry based on bertti loss decomposition models, derive loss decomposition calculation models under the excitation of asymmetric square waves and triangular waves, realize the decomposition of the core loss of the high-frequency transformer under the excitation of asymmetric square waves and triangular waves, and correct the loss coefficients according to the change characteristics of the loss coefficients, so as to calculate the core loss of the high-frequency transformer when the asymmetric voltage excitations are applied.
According to some embodiments, a first scheme of the present disclosure provides a high-frequency transformer loss decomposition method based on different excitations, which adopts the following technical scheme:
a high frequency transformer loss decomposition method based on different excitations, comprising:
Obtaining the loss type of the high-frequency transformer;
Introducing an eddy current loss correction coefficient and a residual loss correction coefficient under asymmetric voltage excitation, and calculating the core loss of the high-frequency transformer according to the obtained loss type of the high-frequency transformer;
And (3) calculating an eddy current loss correction coefficient and a residual loss correction coefficient under the asymmetric voltage excitation of any on-time ratio by considering the change of magnetic induction intensity under the asymmetric voltage excitation of any on-time ratio, and combining the core loss and loss type of the obtained high-frequency transformer to finish the decomposition calculation of the high-frequency transformer loss under different excitation.
As a further technical definition, the types of high frequency transformer losses obtained include hysteresis losses, eddy current losses and residual losses.
As a further technical definition, the magnetic induction intensity under sinusoidal voltage excitation condition is B (t) =b m cos (ωt); wherein B m is the magnetic induction intensity amplitude, and ω is the angular velocity; the loss decomposition model of the high-frequency transformer under sinusoidal excitation is as follows
Wherein P sin is the loss of the high-frequency transformer under sinusoidal excitation; p sin-h is hysteresis loss of the high-frequency transformer under sinusoidal excitation; p sin-e is the eddy current loss of the high-frequency transformer under sinusoidal excitation; p sin-s is the residual loss of the high-frequency transformer under sinusoidal excitation; k h is hysteresis loss coefficient, K e is eddy current loss coefficient, K s is residual loss coefficient, f is working frequency of the high-frequency transformer, sigma is conductivity of the nanocrystalline material, rho is density of the nanocrystalline material, d is thickness of the nanocrystalline strip, T is magnetization period, G is dimensionless coefficient, S is lamination cross-sectional area, and V 0 is internal statistical parameter of the nanocrystalline material.
As a further technical definition, the magnetic induction intensity at square wave excitation voltage isWherein B m is the magnetic induction intensity amplitude, and T is the magnetization period; the loss decomposition model of the high-frequency transformer under square wave excitation is as followsWherein P square is the loss of the high-frequency transformer under square wave excitation; p square-h is hysteresis loss of the high-frequency transformer under square wave excitation; p square-e is the eddy current loss of the high-frequency transformer under square wave excitation; p square-s is the residual loss of the high frequency transformer under square wave excitation.
As a further technical definition, the eddy current loss correction coefficient under the asymmetric voltage excitation is a ratio of eddy current losses of the high frequency transformer under the different excitation, and the residual loss correction coefficient under the asymmetric voltage excitation is a ratio of residual losses of the high frequency transformer under the different excitation.
As a further technical definition, the asymmetric voltage excitation is to set the positive half-wave and the negative half-wave under different voltage excitation to be of unequal widths, i.e. the voltage excitation on-times of the high level and the low level are not consistent.
As a further technical definition, the core loss of the high frequency transformer includes hysteresis loss, corrected eddy current loss, and corrected residual loss; the modified eddy current loss is the product of the eddy current loss correction coefficient and the eddy current loss in the acquired high-frequency transformer loss decomposition model, and the modified residual loss is the product of the residual loss correction coefficient and the residual loss in the acquired high-frequency transformer loss decomposition model.
As a further technical definition, under the same operating frequency and the same magnetic density peak value condition, the eddy current loss correction coefficient and the residual loss correction coefficient of the asymmetric square wave excitation are both greater than those of the asymmetric sine wave excitation.
As a further technical limitation, based on the change of the magnetic induction intensity under any on-time ratio, the eddy current loss and the residual loss under the asymmetric different voltage excitation are calculated, and the eddy current loss correction coefficient and the residual loss correction coefficient under the asymmetric voltage excitation under any on-time ratio are obtained.
As a further technical definition, the high-frequency transformer loss under different excitations includes hysteresis loss, corrected eddy current loss considering arbitrary on-time ratio, and corrected residual loss considering arbitrary on-time ratio; the eddy current loss after correction considering the arbitrary on-time ratio is the product of the eddy current loss correction coefficient considering the arbitrary on-time ratio and the eddy current loss in the obtained high-frequency transformer loss decomposition model, and the residual loss after correction considering the arbitrary on-time ratio is the product of the residual loss correction coefficient considering the arbitrary on-time ratio and the residual loss in the obtained high-frequency transformer loss decomposition model.
According to some embodiments, a second aspect of the present disclosure provides a high-frequency transformer loss decomposition device based on different excitations, which adopts the following technical scheme:
a high frequency transformer loss decomposition device based on different excitations, comprising:
The acquisition module is used for acquiring the loss type of the high-frequency transformer;
the decomposition module is used for introducing an eddy current loss correction coefficient and a residual loss correction coefficient under asymmetric voltage excitation and calculating the core loss of the high-frequency transformer according to the obtained loss type of the high-frequency transformer; calculating the core loss of the high-frequency transformer according to the obtained loss decomposition model; and calculating an eddy current loss correction coefficient and a residual loss correction coefficient under the asymmetric voltage excitation of any on-time ratio by considering the change of magnetic induction intensity under the asymmetric voltage excitation of any on-time ratio, and combining the obtained high-frequency transformer loss decomposition model to complete the decomposition calculation of the high-frequency transformer loss under different excitation.
Compared with the prior art, the beneficial effects of the present disclosure are:
The loss decomposition method under the asymmetric non-sinusoidal excitation provided by the disclosure is more universal, the asymmetric non-sinusoidal voltage excitation can be regarded as a fault excitation on the basis of the core loss decomposition under the non-sinusoidal excitation, and the core loss is calculated under the fault condition; under the excitation of asymmetric and non-sinusoidal voltage, the magnetic density of the iron core is often expressed as an asymmetric and non-sinusoidal space vector, and at the moment, if saturation effect exists, a great error can be generated, and the traditional non-sinusoidal loss decomposition method is difficult to adapt.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the exemplary embodiments of the disclosure and together with the description serve to explain the disclosure, and do not constitute an undue limitation on the disclosure.
FIG. 1 is a flow chart of a high frequency transformer loss decomposition method based on different excitations in a first embodiment of the present disclosure;
FIG. 2 is a waveform diagram of the waveform excitation voltage and the magnetic induction intensity over time in one period in a first embodiment of the present disclosure;
FIG. 3 is a waveform diagram of an asymmetric square wave excitation voltage and magnetic induction over time in a period in accordance with a first embodiment of the present disclosure;
FIG. 4 is a waveform diagram of an asymmetric square wave excitation voltage versus magnetic induction of any on-time ratio over time in a cycle in accordance with one embodiment of the present disclosure;
FIG. 5 is a waveform diagram of a triangle wave excitation voltage and a magnetic induction intensity over time in one period according to a first embodiment of the present disclosure;
FIG. 6 is a waveform diagram of an asymmetric triangular wave excitation voltage and magnetic induction intensity over time in one period in a first embodiment of the present disclosure;
FIG. 7 is a waveform diagram of an asymmetric triangular wave excitation voltage and magnetic induction intensity of any on-time ratio in one period according to the first embodiment of the present disclosure;
Fig. 8 is a waveform diagram of a loss correction coefficient in the first embodiment of the present disclosure.
Detailed Description
The disclosure is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In the present disclosure, terms such as "fixedly coupled," "connected," and the like are to be construed broadly and refer to either a fixed connection or an integral or removable connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in the disclosure may be determined according to circumstances, and should not be interpreted as limiting the disclosure, for relevant scientific research or a person skilled in the art.
Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.
Example 1
The first embodiment of the disclosure introduces a high-frequency transformer loss decomposition method based on different excitations.
A method for decomposing the loss of a high-frequency transformer based on different excitations as shown in fig. 1, comprising:
Obtaining the loss type of the high-frequency transformer;
Introducing an eddy current loss correction coefficient and a residual loss correction coefficient under asymmetric voltage excitation, and calculating the core loss of the high-frequency transformer according to the obtained loss type of the high-frequency transformer;
And (3) calculating an eddy current loss correction coefficient and a residual loss correction coefficient under the asymmetric voltage excitation of any on-time ratio by considering the change of magnetic induction intensity under the asymmetric voltage excitation of any on-time ratio, and combining the core loss and loss type of the obtained high-frequency transformer to finish the decomposition calculation of the high-frequency transformer loss under different excitation.
According to Bertotti loss analysis theory, the calculation formula of the loss model is as follows:
Wherein, K h is hysteresis loss coefficient, K e is eddy current loss coefficient, K s is residual loss coefficient, f is working frequency of high-frequency transformer, B m is magnetic induction intensity amplitude, σ is conductivity of nanocrystalline material, ρ is density of nanocrystalline material, d is thickness of nanocrystalline strip, T is magnetization period, G is dimensionless coefficient (in this embodiment, value of G is 0.14), S is lamination cross-sectional area, and V 0 is internal statistical parameter of nanocrystalline material.
Under the sine voltage excitation condition, the magnetic induction intensity expression is B (t) =B m cos (ωt), and the loss decomposition formula under the sine excitation can be obtained by substituting the formula:
Loss decomposition model under square wave excitation
The waveform of the square wave excitation voltage and the magnetic induction intensity changing with time in one period is shown in fig. 2.
The magnetic induction intensity change rate under square wave voltage excitation is obtained, and the obtained formula is substituted into a calculation formula of eddy current P square-e and residual loss P square-s under square wave excitation can be obtained:
By dividing the above formula by the eddy current loss decomposition formula under sine wave excitation, the eddy current loss correction coefficient delta 1 and the residual loss correction coefficient lambda 1 under square wave voltage excitation are obtained as follows:
Setting the positive half wave and the negative half wave under the square wave excitation to be of unequal widths, namely inconsistent on time of high level and low level, setting the on time ratio of the positive half wave to the negative half wave to be 1/3, wherein the following is an asymmetric square wave excitation loss decomposition model:
the waveform of the voltage and the magnetic induction intensity changing with time in one period when the asymmetric square wave is excited is shown in fig. 3.
The magnetic induction intensity change rate under the excitation of the asymmetric square wave voltage can be obtained by the above formula, and the obtained formula is substituted, so that the calculation formulas of the eddy current loss P asymmetric-square-e0 and the residual loss P asymmetric-square-s0 under the excitation of the asymmetric square wave can be obtained as follows:
By dividing the above formula by the eddy current loss decomposition formula under sine wave excitation, the eddy current loss correction coefficient delta 2 and the residual loss correction coefficient lambda 2 under asymmetric square wave voltage excitation can be obtained as follows:
model for decomposing loss under triangular wave excitation
The waveform of the voltage and the magnetic induction intensity changing with time in one period when the triangular wave is excited is shown in fig. 5.
The magnetic induction intensity change rate under the excitation of the triangular wave voltage can be obtained by the above formula, and the obtained formula is substituted, so that the eddy current loss P triangle-e and the residual loss P triangle-s under the excitation of the triangular wave voltage can be obtained by the calculation formula:
dividing the eddy current loss decomposition formula under sine excitation by the above formula to obtain an eddy current loss correction coefficient delta 3 and a residual loss correction coefficient lambda 3 under triangular wave excitation, wherein the residual loss correction coefficient delta 3 is:
Loss decomposition model under asymmetric triangular wave excitation
The waveform of the voltage and the magnetic induction intensity changing with time in one period when the asymmetric triangular wave is excited is shown in fig. 6:
BH＝3BL (22)
The magnetic induction intensity change rate under the excitation of the asymmetric triangular wave voltage can be obtained by the above formula, and the obtained formula is substituted, so that the calculation formulas of the eddy current loss P asymmetric-triangle-e0 and the residual loss P asymmetric-triangle-s0 under the excitation of the asymmetric triangular wave can be obtained as follows:
By dividing the above formula by the eddy current loss decomposition formula under sine wave excitation, the eddy current loss correction coefficient delta 4 and the residual loss correction coefficient lambda 4 under asymmetric square wave voltage excitation can be obtained as follows:
By introducing the eddy current and residual loss correction coefficients, a loss formula under non-sinusoidal excitation can be deduced from a sinusoidal calculation formula, and the formula is as follows:
Table 1 shows the correction coefficients of the loss model under square wave and triangular wave excitation:
TABLE 1 correction factors for loss models under square wave and triangular wave excitation
According to table 1, the correction coefficients of the eddy current and the residual loss of the square wave are smaller than 1, and the eddy current and the residual loss of the triangular wave are larger than 1, so that the maximum loss value under the excitation of the triangular wave voltage and the minimum loss value under the excitation of the square wave voltage can be deduced under the condition of giving the same working frequency and the same magnetic density peak value. In addition, the eddy current and the loss correction coefficient of the asymmetric square wave are both larger than 1, and the eddy current and the residual loss coefficient of the asymmetric triangular wave are both smaller than 1, so that the loss value under the excitation of the asymmetric square wave is maximum and the loss value under the excitation of the asymmetric triangular wave voltage is minimum under the same condition.
Loss decomposition model under asymmetric square wave excitation of arbitrary on-time ratio
For the excitation of asymmetric square wave voltage, the positive half-wave conduction time ratio is 1/3 to be generalized to any ratio, the forward conduction time is set to be alpha 1 T, and the following is a loss decomposition model under the excitation of asymmetric square wave with any conduction time ratio:
The waveform of the voltage and the magnetic induction intensity with time in one period when the asymmetric square wave with any on-time ratio is excited is shown in fig. 4.
The magnetic induction intensity change rate under the excitation of the asymmetric square wave voltage can be obtained by the above formula, and the obtained formula is substituted, so that the calculation formulas of the eddy current loss P asymmetric-square-e and the residual loss P asymmetric-square-s under the excitation of the asymmetric square wave can be obtained as follows:
By dividing the above formula by the eddy current loss decomposition formula under sine wave excitation, the eddy current loss correction coefficient delta 5 and the residual loss correction coefficient lambda 5 under asymmetric square wave voltage excitation can be obtained as follows:
loss decomposition model under asymmetric triangular wave excitation of arbitrary on-time ratio
Similarly, for asymmetric triangular wave voltage excitation, the positive half-wave conduction time ratio is 1/3 to be generalized to any ratio, the forward conduction time is set to be alpha 1 T, and the following is a loss decomposition model under asymmetric triangular wave excitation with any conduction time ratio:
The waveform of the voltage and the magnetic induction intensity with time change in one period when the asymmetric triangular wave with any on-time ratio is excited is shown in fig. 7.
The magnetic induction intensity change rate under the excitation of the asymmetric triangular wave voltage can be obtained by the above formula, and the obtained formula is substituted, so that the calculation formulas of the eddy current loss P asymmetric-triangle-e and the residual loss P asymmetric-triangle-s under the excitation of the asymmetric triangular wave can be obtained as follows:
By dividing the above formula by the eddy current loss decomposition formula under sine wave excitation, the eddy current loss correction coefficient delta 6 and the residual loss correction coefficient lambda 6 under asymmetric triangular wave voltage excitation under any on-time ratio can be obtained as follows:
The schematic diagram of the change of the loss correction coefficients of the asymmetric square wave and the triangular wave along with the change of the conduction time ratio is shown in fig. 8, namely the change trend of the loss correction coefficients under the excitation of each voltage along with the change of the conduction time ratio is obtained, and the loss unified decomposition formula can be obtained by substituting each group of correction coefficients into the loss separation model.
The embodiment introduces a high-frequency transformer loss decomposition method based on asymmetric non-sinusoidal voltage excitation, which belongs to fault excitation, namely the embodiment mainly carries out transformer core loss decomposition under fault working conditions, and judges the operation working conditions of the transformer according to the obtained transformer core loss; according to the high-frequency transformer core loss under different excitation obtained by the embodiment, the electric energy transmission efficiency of the transformer can be obtained, namely, the larger the core loss is, the lower the electric energy transmission efficiency is; when the obtained core loss exceeds a preset value (the preset value is set according to the attribute of the transformer and the working environment of the transformer), the transformer is judged to be in a fault running state, and the transformer needs to be powered off for maintenance or replaced.
The present embodiment considers voltage excitation under asymmetry, based on Bertotti loss separation model. The eddy current loss and the residual loss correction coefficient under the asymmetric voltage excitation are introduced, a loss separation calculation model under the asymmetric square wave and triangular wave excitation is deduced, the calculation of the core loss of the high-frequency transformer under the asymmetric square wave and triangular wave excitation is realized, and the loss coefficient is corrected according to the loss coefficient change characteristic; the method introduces the integral of the magnetic induction intensity change rate under different on-time ratios on the basis of the iron core loss decomposition under the excitation of non-sinusoidal voltage, corrects the equivalent frequency, and redefines the loss correction coefficient, thereby having higher calculation precision.
Example two
The second embodiment of the disclosure introduces a high-frequency transformer loss decomposition device based on different excitations.
A high frequency transformer loss decomposition device based on different excitations, comprising:
The acquisition module is used for acquiring the loss type of the high-frequency transformer;
the decomposition module is used for introducing an eddy current loss correction coefficient and a residual loss correction coefficient under asymmetric voltage excitation and calculating the core loss of the high-frequency transformer according to the obtained loss type of the high-frequency transformer; calculating the core loss of the high-frequency transformer according to the obtained loss decomposition model; and calculating an eddy current loss correction coefficient and a residual loss correction coefficient under the asymmetric voltage excitation of any on-time ratio by considering the change of magnetic induction intensity under the asymmetric voltage excitation of any on-time ratio, and combining the obtained high-frequency transformer loss decomposition model to complete the decomposition calculation of the high-frequency transformer loss under different excitation.
The detailed steps are the same as those of the high-frequency transformer loss decomposition method based on different excitation provided in the first embodiment, and will not be described herein.
The foregoing description of the preferred embodiments of the present disclosure is provided only and not intended to limit the disclosure so that various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
While the specific embodiments of the present disclosure have been described above with reference to the drawings, it should be understood that the present disclosure is not limited to the embodiments, and that various modifications and changes can be made by one skilled in the art without inventive effort on the basis of the technical solutions of the present disclosure while remaining within the scope of the present disclosure.
Claims (6)
1. The high-frequency transformer loss decomposition method based on different excitations is characterized by comprising the following steps of:
Obtaining the loss type of the high-frequency transformer;
Introducing an eddy current loss correction coefficient and a residual loss correction coefficient under asymmetric voltage excitation, and calculating the core loss of the high-frequency transformer according to the obtained loss type of the high-frequency transformer;
Calculating an eddy current loss correction coefficient and a residual loss correction coefficient under the asymmetric voltage excitation of any on-time ratio by considering the change of magnetic induction intensity under the asymmetric voltage excitation of any on-time ratio, and combining the core loss and loss type of the obtained high-frequency transformer to complete the decomposition calculation of the high-frequency transformer loss under different excitation;
The asymmetric voltage excitation is to set the positive half wave and the negative half wave under different voltage excitation to be of unequal widths, namely, the voltage excitation conduction time of the high level and the low level is inconsistent;
the voltage under asymmetric square wave excitation of any on-time ratio is:
Wherein T is a magnetization period;
The magnetic induction intensity under the excitation of the asymmetric square wave with any on-time ratio is as follows:
wherein B m is the magnetic induction intensity amplitude;
The eddy current loss P asymmetric-square-e and the residual loss P asymmetric-square-s under the excitation of the asymmetric square wave are calculated as follows:
Wherein f is the working frequency of the high-frequency transformer, B m is the magnetic induction intensity amplitude, sigma is the conductivity of the nanocrystalline material, rho is the density of the nanocrystalline material, d is the thickness of the nanocrystalline strip, T is the magnetization period, G is the dimensionless coefficient, S is the lamination cross-sectional area, and V 0 is the internal statistical parameter of the nanocrystalline material;
The eddy current loss correction coefficient delta 5 and the residual loss correction coefficient lambda 5 under the excitation of the asymmetric square wave voltage are as follows:
The voltage under the excitation of the asymmetric triangular wave with any on-time ratio is as follows:
the magnetic induction intensity under the excitation of the asymmetric triangular wave with any on-time ratio is as follows:
The calculation formulas of the eddy current loss P asymmetric-triangle-e and the residual loss P asymmetric-triangle-s under the excitation of the asymmetric triangular wave are as follows:
The eddy current loss correction coefficient delta 6 and the residual loss correction coefficient lambda 6 under the excitation of the asymmetric triangular wave voltage are as follows:
Wherein, P asymmetric-triangle-e0 is the eddy current loss under the excitation of asymmetric triangular wave, P sin-e is the eddy current loss of the high-frequency transformer under the excitation of sine wave, P asymmetric-triangle-s0 is the residual loss under the excitation of asymmetric triangular wave, and P sin-s is the residual loss of the high-frequency transformer under the excitation of sine wave;
substituting each group of correction coefficients into the loss separation model to obtain a loss unified decomposition formula;
Based on the change of magnetic induction intensity under any on-time ratio, calculating the eddy current loss and the residual loss under the excitation of asymmetric different voltages to obtain an eddy current loss correction coefficient and a residual loss correction coefficient under the excitation of asymmetric voltages with any on-time ratio;
magnetic induction intensity at square wave excitation voltage is Wherein B m is the magnetic induction intensity amplitude, and T is the magnetization period; the loss decomposition model of the high-frequency transformer under square wave excitation is as followsWherein P square is the loss of the high-frequency transformer under square wave excitation; p square-h is hysteresis loss of the high-frequency transformer under square wave excitation; p square-e is the eddy current loss of the high-frequency transformer under square wave excitation; p square-s is the residual loss of the high-frequency transformer under square wave excitation, and K h is the hysteresis loss coefficient;
The eddy current loss correction coefficient under the asymmetric voltage excitation is the ratio of eddy current loss of the high-frequency transformer under different excitation, and the residual loss correction coefficient under the asymmetric voltage excitation is the ratio of residual loss of the high-frequency transformer under different excitation.
2. A method of decomposing high frequency transformer loss based on different excitations as claimed in claim 1, wherein the obtained high frequency transformer loss types include hysteresis loss, eddy current loss and residual loss.
3. The method for decomposing the loss of the high-frequency transformer based on different excitation according to claim 1, wherein the magnetic induction intensity under the sine voltage excitation condition is B (t) =b m cos (ωt); wherein B m is the magnetic induction intensity amplitude, and ω is the angular velocity; the loss decomposition model of the high-frequency transformer under sinusoidal excitation is as follows
Wherein P sin is the loss of the high-frequency transformer under sinusoidal excitation; p sin-h is hysteresis loss of the high-frequency transformer under sinusoidal excitation; p sin-e is the eddy current loss of the high-frequency transformer under sinusoidal excitation; p sin-s is the residual loss of the high-frequency transformer under sinusoidal excitation; k h is hysteresis loss coefficient, K e is eddy current loss coefficient, K s is residual loss coefficient, f is working frequency of the high-frequency transformer, sigma is conductivity of the nanocrystalline material, rho is density of the nanocrystalline material, d is thickness of the nanocrystalline strip, T is magnetization period, G is dimensionless coefficient, S is lamination cross-sectional area, and V 0 is internal statistical parameter of the nanocrystalline material.
4. A method of decomposing the loss of a high frequency transformer based on different excitations as claimed in claim 1, wherein the core loss of said high frequency transformer includes hysteresis loss, corrected eddy current loss and corrected residual loss; the modified eddy current loss is the product of the eddy current loss correction coefficient and the eddy current loss in the acquired high-frequency transformer loss decomposition model, and the modified residual loss is the product of the residual loss correction coefficient and the residual loss in the acquired high-frequency transformer loss decomposition model.
5. A method of decomposing high frequency transformer loss based on different excitations as claimed in claim 1, wherein said high frequency transformer loss under different excitations includes hysteresis loss, corrected eddy current loss taking into account arbitrary on-time ratio and corrected residual loss taking into account arbitrary on-time ratio; the eddy current loss after correction considering the arbitrary on-time ratio is the product of the eddy current loss correction coefficient considering the arbitrary on-time ratio and the eddy current loss in the obtained high-frequency transformer loss decomposition model, and the residual loss after correction considering the arbitrary on-time ratio is the product of the residual loss correction coefficient considering the arbitrary on-time ratio and the residual loss in the obtained high-frequency transformer loss decomposition model.
6. A high frequency transformer loss decomposition device based on different excitations, comprising:
The acquisition module is used for acquiring the loss type of the high-frequency transformer;
The decomposition module is used for introducing an eddy current loss correction coefficient and a residual loss correction coefficient under asymmetric voltage excitation and calculating the core loss of the high-frequency transformer according to the obtained loss type of the high-frequency transformer; calculating the core loss of the high-frequency transformer according to the obtained loss decomposition model; calculating an eddy current loss correction coefficient and a residual loss correction coefficient under the asymmetric voltage excitation of any on-time ratio by considering the change of magnetic induction intensity under the asymmetric voltage excitation of any on-time ratio, and combining the obtained high-frequency transformer loss decomposition model to complete the decomposition calculation of the high-frequency transformer loss under different excitation;
The asymmetric voltage excitation is to set the positive half wave and the negative half wave under different voltage excitation to be of unequal widths, namely, the voltage excitation conduction time of the high level and the low level is inconsistent;
the voltage under asymmetric square wave excitation of any on-time ratio is:
Wherein T is a magnetization period;
The magnetic induction intensity under the excitation of the asymmetric square wave with any on-time ratio is as follows:
wherein B m is the magnetic induction intensity amplitude;
The eddy current loss P asymmetric-square-e and the residual loss P asymmetric-square-s under the excitation of the asymmetric square wave are calculated as follows:
Wherein f is the working frequency of the high-frequency transformer, B m is the magnetic induction intensity amplitude, sigma is the conductivity of the nanocrystalline material, rho is the density of the nanocrystalline material, d is the thickness of the nanocrystalline strip, T is the magnetization period, G is the dimensionless coefficient, S is the lamination cross-sectional area, and V 0 is the internal statistical parameter of the nanocrystalline material;
The eddy current loss correction coefficient delta 5 and the residual loss correction coefficient lambda 5 under the excitation of the asymmetric square wave voltage are as follows:
The voltage under the excitation of the asymmetric triangular wave with any on-time ratio is as follows:
the magnetic induction intensity under the excitation of the asymmetric triangular wave with any on-time ratio is as follows:
The calculation formulas of the eddy current loss P asymmetric-triangle-e and the residual loss P asymmetric-triangle-s under the excitation of the asymmetric triangular wave are as follows:
The eddy current loss correction coefficient delta 6 and the residual loss correction coefficient lambda 6 under the excitation of the asymmetric triangular wave voltage are as follows:
Wherein, P asymmetric-triangle-e0 is the eddy current loss under the excitation of asymmetric triangular wave, P sin-e is the eddy current loss of the high-frequency transformer under the excitation of sine wave, P asymmetric-triangle-s0 is the residual loss under the excitation of asymmetric triangular wave, and P sin-s is the residual loss of the high-frequency transformer under the excitation of sine wave;
substituting each group of correction coefficients into the loss separation model to obtain a loss unified decomposition formula;
Based on the change of magnetic induction intensity under any on-time ratio, calculating the eddy current loss and the residual loss under the excitation of asymmetric different voltages to obtain an eddy current loss correction coefficient and a residual loss correction coefficient under the excitation of asymmetric voltages with any on-time ratio;
magnetic induction intensity at square wave excitation voltage is Wherein B m is the magnetic induction intensity amplitude, and T is the magnetization period; the loss decomposition model of the high-frequency transformer under square wave excitation is as followsWherein P square is the loss of the high-frequency transformer under square wave excitation; p square-h is hysteresis loss of the high-frequency transformer under square wave excitation; p square-e is the eddy current loss of the high-frequency transformer under square wave excitation; p square-s is the residual loss of the high-frequency transformer under square wave excitation, and K h is the hysteresis loss coefficient;
The eddy current loss correction coefficient under the asymmetric voltage excitation is the ratio of eddy current loss of the high-frequency transformer under different excitation, and the residual loss correction coefficient under the asymmetric voltage excitation is the ratio of residual loss of the high-frequency transformer under different excitation.
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