Device for measuring magnetic flux density in high-frequency transformer and high-frequency transformer
A high-frequency transformer and magnetic flux density technology, applied in the field of transformers, to achieve the effect of simple device structure
Active Publication Date: 2022-03-01
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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Problems solved by technology
[0005] The invention provides a high-frequency transformer internal magnetic flux density measuring device and a high-frequency transformer, which solves the technical problem of low-loss and low-cost measurement of the high-frequency transformer internal magnetic flux density
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[0030] The embodiment of the present invention provides a high-frequency transformer internal magnetic flux density measuring device and a high-frequency transformer, which are used to solve the technical problem of low-loss and low-cost measurement of the high-frequency transformer internal magnetic flux density.
[0031] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0032] see figure 1 ,...
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The invention relates to the technical field of transformers, and discloses a high-frequency transformer internal magnetic flux density measuring device and a high-frequency transformer. The device comprises auxiliary magnetic cores, a driving circuit module and a magnetic flux density determining module, the auxiliary magnetic cores are arranged on the main magnetic core side of the high-frequency transformer to be measured, the magnetic flux of the auxiliary magnetic cores is not parallel to the magnetic flux of the main magnetic core, each auxiliary magnetic core is driven through two staggered half-bridges in a 90-degree phase shift mode, and the magnetic flux density determining module determines the magnetic flux density of the high-frequency transformer to be measured. Each bridge enables the current to pass through the corresponding auxiliary magnetic core, the current is rectified through a rectifier bridge circuit, then the current output by the rectifier bridge circuit is converted into a voltage signal by a magnetic flux density determination module, and a corresponding main magnetic core magnetic flux density value is obtained based on the voltage signal; the device realizes continuous monitoring of the magnetic flux state of the main magnetic core, is simple in structure, can avoid increase of magnetic core loss and change of transformer topology, and has the advantages of low loss and low cost.
Description
technical field [0001] The invention relates to the technical field of transformers, in particular to a high-frequency transformer internal magnetic flux density measuring device and a high-frequency transformer. Background technique [0002] Isolated or high step-up ratio DC-DC converters have built-in semiconductor switches that provide AC excitation for the transformer. Phenomena such as mismatched on / off times, semiconductor forward voltage drops, gate drive signal delays, insufficient pulse width modulation (PWM) resolution, or pulsating loads can result in a second difference between the positive and negative voltages applied to the transformer. This results in a DC voltage component at the transformer terminals, which creates an unwanted DC flux density component in the transformer core. [0003] With this DC flux density component, the core can be easily driven outside the linear region of the B-H curve, producing a high peak nonlinear magnetizing current. This lea...
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IPC IPC(8): G01R33/12H01F27/40
CPCG01R33/12H01F27/402H01F27/40
Inventor 徐硕许中王勇栾乐周凯马智远代晓丰孙奇珍
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD