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Method and system for measuring magnetic core loss of magnetic element of PFC circuit

A technology of core loss and magnetic components, which is applied in the field of PFC circuit magnetic component core loss measurement methods and systems, can solve the problems of large inductance value of PFC, large parasitic capacitance, and inability to realize a single control variable, and achieve simple operation and time-consuming short effect

Pending Publication Date: 2022-01-04
FUZHOU UNIV
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Problems solved by technology

[0010] Therefore, using the AC power method to measure the core loss of magnetic materials with an impedance angle up to 89° and the core loss of high-frequency excitation has a very large error
[0011] (2) The duty cycle and frequency of the PFC circuit change in real time, so when measuring the PFC inductance online, a single control variable cannot be achieved
[0012] (3) The inductance value of PFC is large, and the number of winding turns is large, while the double-winding AC power method needs to increase the secondary induction winding, and its parasitic capacitance is extremely large, which will lead to large measurement errors

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  • Method and system for measuring magnetic core loss of magnetic element of PFC circuit
  • Method and system for measuring magnetic core loss of magnetic element of PFC circuit
  • Method and system for measuring magnetic core loss of magnetic element of PFC circuit

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[0038] In order to make the features and advantages of this patent more obvious and easy to understand, the following special examples are described in detail as follows:

[0039] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. 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 application belongs. It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operat...

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Abstract

The invention provides a method and a system for measuring magnetic core loss of a magnetic element of a PFC (Power Factor Correction) circuit, and provides and builds a system for measuring magnetic core loss of a magnetic element under excitation of a power frequency sine wave and a high-frequency PWM (Pulse Width Modulation) wave based on a measurement principle of a direct current power method.A power frequency sine wave excitation source and a high-frequency PWM wave excitation source are applied to a tested piece at the same time, and the excitation waveform applied to the magnetic element in the PFC circuit is simulated. According to the measuring system, the defect that a single parameter cannot be controlled when the loss of the PFC inductor magnetic core is measured on line by an alternating current power method is overcome, the influence of each influence factor on the loss of the PFC inductor magnetic core can be quantified, and the loss of the PFC inductor magnetic core can be accurately measured.

Description

technical field [0001] The invention belongs to the technical fields of PFC circuit, magnetic core loss prediction and the like, and in particular relates to a method and system for measuring the magnetic core loss of a PFC circuit magnetic element. Background technique [0002] The core loss of the magnetic components of the power converter is related to the excitation voltage waveform, frequency, amplitude, duty cycle, etc. The mechanism is extremely complex, and its accurate quantification is very important for the optimal design and thermal design of the power converter. The excitation voltage waveform of the magnetic components of the active power factor correction circuit (PFC) is a 50Hz sine wave superimposed on a high-frequency PWM wave. Related, its accurate quantification is a difficult problem in the industry. [0003] At present, the core loss measurement methods of magnetic components in PFC circuits mainly include the AC power method. The schematic diagram of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12
CPCG01R33/123
Inventor 汪晶慧卢志诚陈为
Owner FUZHOU UNIV
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