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 testing method. The method comprises the steps of preparing a line connecting jig which is well connected with a signal generator and two channels of an oscilloscope in advance, wherein connection can be quickly formed in testing by only inserting a transformer under test into the line connecting jig, then injecting signals through the signal generator, erecting a pen by using the first channel of the oscilloscope to monitor the signals so as to confirm whether an input reference signal is correct or not, then erecting a pen by using the second channel of the oscilloscope to monitor a coupling voltage VPP value so as to serve as a test result for voltage judgment, and finally comparing the coupling voltage monitored by the second channel of the oscilloscope with a qualified product / unqualified product data reference in a database so as to judge whether the tested transformer is a qualified product or not. Coupling voltage measurement is performed by adopting the signal generator and the oscilloscope, so that the method effectively considers influences of potential distribution of coil windings of the transformer, the winding structure mode and a shielding layer copper foil, and thus the measurement accuracy is improved.

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...

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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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