Magnetic field immunity testing device and method for magnetic coupling digital isolator

Abstract

The invention provides a magnetic field immunity testing device and method for a magnetic coupling digital isolator, and aims to evaluate the magnetic field immunity of the magnetic coupling digital isolator. A magnetic field generating device provides signals of different frequency bands through an adjustable direct-current power supply, an audio signal source and a radio frequency signal source.The adjustable direct-current power supply is connected with a Helmholtz coil. An audio signal source and a radio frequency signal source are connected with a magnetic field generating device-Helmholtz coil, a radiation ring and a TEM cell through two corresponding power amplifiers, which is used for covering test frequency bands required by different standards. After a signal passes through thepower amplifiers, the signals are applied to a tested device through the magnetic field generation device, the magnetic field intensity value is monitored in real time through the magnetic field detection device, and the output level of the direct-current power supply, an audio signal source or a radio frequency signal source is properly adjusted according to the feedback magnetic field intensityinformation so as to reach the required magnetic field intensity. Through the above arrangement, a user can conveniently and rapidly complete the test of the immunity of the magnetic coupling digitalisolator.

Description

technical field [0001] The invention relates to the field of digital isolators, in particular to a magnetic field immunity test device and method for a magnetic coupling digital isolator. Background technique [0002] The application environment of digital isolators usually includes some generators and other equipment that generate strong electromagnetic fields. Exposure to these magnetic fields can cause potential data corruption issues as electrical potentials (EMF, the voltage created by these magnetic fields) can interfere with data signal transmission. Because of this potential threat, many users of digital isolators require isolators to have high magnetic field immunity (MFI). [0003] A live conductor, such as a motor's power wire, is surrounded by a magnetic field formed by the current flowing through it. The direction of this magnetic field can be determined by applying the right-hand rule. The plane of the flux lines is always perpendicular to the current flow. ...

AI Technical Summary

Problems solved by technology

[0011] In view of this, the object of the present invention is to propose a magnetic coupling digital isolator magnetic field immunity test device and method, which can solve the magnetic field immunity evaluation test problem of the magnetic coupling digital isolator, and can truly reflect the impact of the device under test on the interference magnetic field. Anti-interference performance

Images