CN110133547A - A kind of method of precise measurement core loss - Google Patents
A kind of method of precise measurement core loss Download PDFInfo
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- CN110133547A CN110133547A CN201910482248.9A CN201910482248A CN110133547A CN 110133547 A CN110133547 A CN 110133547A CN 201910482248 A CN201910482248 A CN 201910482248A CN 110133547 A CN110133547 A CN 110133547A
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- inductance
- core
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- hollow coil
- peak value
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
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Abstract
The present invention provides a kind of method of precise measurement core loss, and steps are as follows for measurement method: step 1: the current peak value I of core inductance to be measured is flowed through in measurement1, current effective value Iac, AC impedance Rac.coreWith Mean Input Power Pcore；Step 2: the current peak value I of hollow coil group is flowed through in measurement2；Step 3: inputting the current peak value that measures twice in LabVIEW host computer interface, and control single chip computer Auto-matching inductance network carries out adjustment of inductance, makes to flow through the hollow coil group adjusted identical with the current peak value of magnetic core power inductance；Record the AC impedance R of hollow coil group at this timeac.airWith Mean Input Power Pair；Step 4: by above data, according to formulaTo core loss PlossIt is calculated.Solve measurement accuracy existing for traditional magnetic loss mensuration is not high, height, the problems such as measurement process complexity are required experimental situation.
Description
Technical field
The present invention relates to switch converters field more particularly to a kind of methods of precise measurement core loss.
Background technique
High frequency, miniaturization are the mainstream development trend of switch converters, and the switching frequency for improving switch converters is to subtract
One effective means of its few volume.The raising of frequency causes the heat dissipation problems of switch converters just to can not be ignored, wherein making
It needs to pay attention to especially for the loss of the magnetic element of important component in switch converters.Practical work is not only given in the measurement of core loss
Lossy data is directly provided in journey design, or academic theory research provides data and supports.Due to current many instruments and
The precision and range of magnetic loss measurement has been not achieved in method, and it is therefore necessary to find, more convenient, more accurate, measurement range is wider array of
Magnetic loss measurement method.
Magnetic loss measurement method includes the direct method of measurement and the indirect method of measurement at present.The so-called indirect method of measurement refers to using magnetic
Fuel factor, magnetic effect and equivalent resistance of element etc. reflect the size of core loss indirectly.Such methods theoretically measurement accuracy
It is very high, but it is more demanding to experimental situation, and calculating process is complicated.The direct method of measurement is exactly the excitation by measuring magnetic core
Voltage is lost with electric current.It is the typical direct method of measurement that digital oscilloscope, which surveys voltage and current method, and there are phase angle mistakes
Difference is generally come between cancellation current and voltage in magnetism in one lower capacitor C of loss of incoming end series connection of magnetic core coil
The influence of power-factor angle.Therefore, solve measurement accuracy existing for traditional magnetic loss mensuration it is not high, to experimental situation require it is high,
The problems such as measurement process complexity.
Summary of the invention
To solve the above problems, it is an object of the invention to provide a kind of methods of precise measurement core loss, using inductance etc.
The thought of replacement is imitated, the average power consumption that measurement power core inductance and hollow coil group generate in full-bridge converter is surveyed
The key of examination is the current peak value approximation one for adjusting air core coil combination and passing through hollow coil group and power core inductance
It causes, to guarantee that circuit switch loss is approximate consistent with loop circuit impedance loss.In the input oscillograph acquisition of LabVIEW host computer interface
The current peak value of the two arrived, control single chip computer Auto-matching inductance network, and automatically obtain it and exchange the letter such as resistance value, inductance value
Breath.Measurement replacement front and back circuit average current input, average input voltage and the current effective value for flowing through them respectively, are surveyed twice
The input power difference measured with both exchange copper loss difference and as core loss, solve traditional magnetic loss mensuration
Existing measurement accuracy is not high, requires the problems such as height, measurement process complexity to experimental situation.
The present invention provides a kind of method of precise measurement core loss, and steps are as follows for the measurement method:
Step 1: the current peak value I of core inductance to be measured is flowed through in measurement1, current effective value Iac, AC impedance Rac.corePeace
Equal input power Pcore；
Step 2: the current peak value I of hollow coil group is flowed through in measurement2；
Step 3: the current peak value measured twice, control single chip computer Auto-matching inductance are inputted in LabVIEW host computer interface
Network carries out adjustment of inductance, makes to flow through the hollow coil group adjusted identical with the current peak value of magnetic core power inductance；Note
Record the AC impedance R of hollow coil group at this timeac.airWith Mean Input Power Pair；
Step 4: by above data, according to formulaMagnetic core is damaged
Consume PlossIt is calculated, obtains core loss Ploss。
Further improvement lies in that: in the collected hollow coil group of LabVIEW host computer interface input oscillograph and power
The current peak value of core inductance, inductance matching network is constituted using the series-parallel inductance of multiple groups, and control single chip computer adjusts relay
The switch combination of device carrys out automatic matching inductance, guarantees to flow through the electric current of the hollow coil group and magnetic core power inductance to be measured after matching
Peak-to-peak value is identical.
Further improvement lies in that: the measurement must be in work such as same frequency, same duty ratio and same input and output
Under the conditions of measure core inductance respectively and matched hollow coil circuit average current input, average input voltage and flow through it
Electric current virtual value.
Further improvement lies in that: hollow inductance network is by series-parallel hollow coil, and hollow coil is using same material
Copper wire air line coiling, by single-chip microcontroller control combination difference relay switch, guarantee to flow through hollow coil group after adjusting and
The current peak value of magnetic core power inductance is identical, i.e. the current effective value of the two is also almost the same, this is with regard to two kinds of basic guarantee
In the case of circuit switching loss it is almost the same, it is ensured that the accuracy of test result.
Beneficial effects of the present invention: can be good at overcoming precision existing for traditional magnetic loss mensuration it is not high, to experimental ring
Border requires the problems such as height, measurement process complexity, by taking power inductance in full-bridge circuit as an example, controls inductance pair net by single-chip microcontroller
Network carries out accurate adjustment of inductance to hollow coil, so that flowing through the electricity of hollow coil group and magnetic core power inductance after adjusting
Stream peak peak value is identical, i.e. the current effective value of the two is also almost the same, this is opened with regard to the circuit in the case of two kinds of basic guarantee
It is almost the same to close loss, it is ensured that the accuracy of test result.
Detailed description of the invention
Fig. 1 is hollow inductance network figure of the invention.
Fig. 2 is magnetic core power inductance full-bridge circuit schematic diagram of the invention.
Fig. 3 is hollow inductance group full-bridge circuit schematic diagram of the invention.
Specific embodiment
In order to deepen the understanding of the present invention, the present invention will be described in further detail with reference to the examples below, the embodiment
For explaining only the invention, it is not intended to limit the scope of the present invention..
As shown in Figure 1-3, the measurement method step is such as the present embodiment provides a kind of method of precise measurement core loss
Under:
Step 1: the current peak value I of core inductance to be measured is flowed through in measurement1, current effective value Iac, AC impedance Rac.corePeace
Equal input power Pcore；
Step 2: the current peak value I of hollow coil group is flowed through in measurement2；
Step 3: the current peak value measured twice, control single chip computer Auto-matching inductance are inputted in LabVIEW host computer interface
Network carries out adjustment of inductance, makes to flow through the hollow coil group adjusted identical with the current peak value of magnetic core power inductance；Note
Record the AC impedance R of hollow coil group at this timeac.airWith Mean Input Power Pair；
Step 4: by above data, according to formulaMagnetic core is damaged
Consume PlossIt is calculated, obtains core loss Ploss。
For testing the power inductance in full-bridge converter, the present embodiment uses the thought of inductance equivalence replacement, measurement
The average power consumption that hollow coil group and power core inductance generate in full-bridge converter, series-parallel multiple groups hollow coil structure
At hollow inductance network, the key of test is the electricity for adjusting air core coil group and passing through hollow coil group and power core inductance
Stream peak peak value is consistent, in the LabVIEW host computer interface collected hollow coil group of input oscillograph and power core inductance
Current peak value constitutes inductance matching network, the switching group of control single chip computer regulating relay using the series-parallel inductance of multiple groups
It closes and carrys out automatic matching inductance, guarantee to flow through the current peak value phase of the hollow coil group and magnetic core power inductance to be measured after matching
Together.The measurement must measure respectively magnetic core electricity under the operating conditions such as same frequency, same duty ratio and same input and output
Feel and matched hollow coil circuit average current input, average input voltage and flow through they electric current virtual value.It is empty
Core inductance network uses the copper wire air line coiling of same material, passes through single-chip microcontroller by series-parallel hollow coil, hollow coil
Control combination difference relay switch guarantees to flow through the current peak value phase of the hollow coil group and magnetic core power inductance after adjusting
Together, i.e. the current effective value of the two is also almost the same, this is basic with regard to the switching loss of the circuit in the case of two kinds of basic guarantee
Unanimously, it is ensured that the accuracy of test result.
It is not high, complicated to experimental situation requirement height, measurement process to solve measurement accuracy existing for traditional magnetic loss mensuration
Etc. problems.For testing the power inductance in full-bridge converter, hollow inductance network is adjusted by control single chip computer, so that stream
Both hollow coil group after adjusting is identical with the current peak value of magnetic core power inductance, i.e., current effective value also basic one
It causes, this is almost the same with regard to the switching loss of the circuit in the case of two kinds of basic guarantee, it is ensured that the accuracy of test result.
Claims (4)
1. a kind of method of precise measurement core loss, it is characterised in that: steps are as follows for the measurement method:
Step 1: the current peak value I of core inductance to be measured is flowed through in measurement1, current effective value Iac, AC impedance Rac.corePeace
Equal input power Pcore；
Step 2: the current peak value I of hollow coil group is flowed through in measurement2；
Step 3: the current peak value measured twice, control single chip computer Auto-matching inductance are inputted in LabVIEW host computer interface
Network carries out adjustment of inductance, makes to flow through the hollow coil group adjusted identical with the current peak value of magnetic core power inductance；Note
Record the AC impedance R of hollow coil group at this timeac.airWith Mean Input Power Pair；
Step 4: by above data, according to formulaTo core loss
PlossIt is calculated, obtains core loss Ploss。
2. a kind of method of precise measurement core loss as described in claim 1, it is characterised in that: in LabVIEW host computer
Interface inputs the current peak value of oscillograph collected hollow coil group and power core inductance, utilizes the series-parallel inductance of multiple groups
Constitute inductance matching network, the switch combination of control single chip computer regulating relay carrys out automatic matching inductance, matching is flowed through in guarantee
Hollow coil group afterwards is identical with the current peak value of magnetic core power inductance to be measured.
3. a kind of method of precise measurement core loss as described in claim 1, it is characterised in that: the measurement must be same
The hollow coil for measuring core inductance respectively under the operating conditions such as one frequency, same duty ratio and same input and output and matching
Circuit average current input, average input voltage and flow through they electric current virtual value.
4. a kind of method of precise measurement core loss as described in claim 1, it is characterised in that: hollow inductance network passes through
Series-parallel hollow coil, hollow coil use same material copper wire air line coiling, by single-chip microcontroller control combination difference after
Electric switch guarantees that the hollow coil group flowed through after adjusting is identical with the current peak value of magnetic core power inductance, i.e. the electricity of the two
It is also almost the same to flow virtual value.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112230050A (en) * | 2020-10-13 | 2021-01-15 | 南京新康达磁业股份有限公司 | Metal soft magnetic power loss measurement improvement device and working method thereof |
Citations (4)
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| US20130049744A1 (en) * | 2011-08-31 | 2013-02-28 | Mingkai Mu | High Frequency Loss Measurement Apparatus and Methods for Inductors and Transformers |
| CN103226187A (en) * | 2013-04-23 | 2013-07-31 | 福州大学 | Method for measuring loss of magnetic element |
| CN104133118A (en) * | 2014-08-23 | 2014-11-05 | 福州大学 | Calibration method for measurement of magnetic core loss |
| CN106291124A (en) * | 2016-08-17 | 2017-01-04 | 福州大学 | The calibrating method that a kind of core loss is measured |
-
2019
- 2019-05-30 CN CN201910482248.9A patent/CN110133547B/en active Active
Patent Citations (4)
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|---|---|---|---|---|
| US20130049744A1 (en) * | 2011-08-31 | 2013-02-28 | Mingkai Mu | High Frequency Loss Measurement Apparatus and Methods for Inductors and Transformers |
| CN103226187A (en) * | 2013-04-23 | 2013-07-31 | 福州大学 | Method for measuring loss of magnetic element |
| CN104133118A (en) * | 2014-08-23 | 2014-11-05 | 福州大学 | Calibration method for measurement of magnetic core loss |
| CN106291124A (en) * | 2016-08-17 | 2017-01-04 | 福州大学 | The calibrating method that a kind of core loss is measured |
Non-Patent Citations (2)
| Title |
|---|
| 叶建盈等: "基于差值功率的高频磁芯损耗测量方法及装置", 《中国电机工程学报》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112230050A (en) * | 2020-10-13 | 2021-01-15 | 南京新康达磁业股份有限公司 | Metal soft magnetic power loss measurement improvement device and working method thereof |
| CN112230050B (en) * | 2020-10-13 | 2023-08-11 | 马鞍山新康达磁业有限公司 | Improved metal soft magnetic power loss measurement device and working method thereof |
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