High-frequency transformer common-mode noise and conduction radiation testing method

Abstract

The invention discloses a high-frequency transformer common-mode noise and conduction radiation test method. It prepares two sets of channels and connection line fixtures that have been connected with a signal generator and an oscilloscope in advance. During the test, only the transformer to be tested needs to be inserted into the connection line. On the line diagram fixture, the connection can be quickly formed, and then the signal is poured into the signal through the signal generator, and the signal is monitored by using a test lead on the first channel of the oscilloscope to confirm whether the input reference signal is correct. The test pen monitors the coupling voltage VPP value as the test result to determine the voltage, and finally compares the coupling voltage monitored by the second channel of the oscilloscope with the good / defective product data in the database to determine whether the transformer tested this time is a good product. By using a signal generator and an oscilloscope for coupling voltage measurement, this method effectively considers the potential distribution of the transformer coil winding, the winding structure and the influence of the copper foil of the shielding layer, thereby improving the measurement accuracy.

Description

technical field [0001] The invention relates to the technology in the field of transformer quality detection, in particular to a method for testing common-mode noise and conducted radiation of high-frequency transformers. Background technique [0002] The transformer is the transmission element of magnetic energy in the circuit. In the circuit design, generally only the magnetic parameter characteristics such as its inductance and coupling coefficient and loss parameters are considered. However, in order to better study the working state of the transformer under dynamic conditions, it is necessary to measure its dynamic characteristics. Between the primary and secondary sides of the transformer, the coupling capacitance determined only by physical structural parameters such as the relative area of ​​the windings and the insulation distance between the windings is called a structural capacitance. Considering the influence of the winding potential distribution when the actual...

AI Technical Summary

Problems solved by technology

[0003] The traditional method of using LCR to measure the structural capacitance parameters between the primary and secondary windings of the transformer cannot effectively reflect the potential distribution of the coil winding and the influence of the shielding layer on common-mode noise and conducted radiation

The effectiveness of the quality control of the transformer cannot be ensured, and timely and effective monitoring cannot be performed. The test must be carried out after the customer plugs in the board. If the quality is abnormal, it will bring immeasurable losses to the company and customers.

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