1. Shielding technology
The use of metal materials to make a container, the circuit that needs to be maintained is wrapped in it, which can effectively avoid the disturbance of electric or magnetic fields, and this method is called shielding. Shielding can be divided into electrostatic shielding, electromagnetic shielding and low-frequency magnetic shielding.
2. Electrostatic shielding
According to the principle of electromagnetism, there are no electric field lines inside a closed hollow conductor placed in an electrostatic field, and the internal points of each point are equipotential. Using this principle, a metal with outstanding conductivity such as copper or aluminum is used as the data to make a sealed metal container, and connect it with the ground wire, so that the circuit value that needs to be maintained is in it, so that the external disturbance electric field does not affect its internal circuit, and conversely, the electric field generated by the internal circuit does not affect the external circuit. This method is called electrostatic shielding. For example, in the sensing noise measurement circuit, a conductor with a gap is inserted between the primary side and the secondary side of the power transformer, and it is grounded, which can avoid the electrostatic coupling of the two windings, and this method is attributed to electrostatic shielding.
3. Electromagnetic shielding
For the high-frequency disturbance magnetic field, the eddy current principle is utilized, the eddy current of the high-frequency disturbance electromagnetic field is made in the shielded metal, the energy of the disturbing magnetic field is consumed, and the eddy current magnetic field cancels out the high-frequency disturbance magnetic field, so that the maintained circuit is protected from the influence of high-frequency electromagnetic field. This shielding method is called electromagnetic shielding. If the electromagnetic shield is grounded, it has the effect of electrostatic shielding. The output cable of the sensor is generally shielded with copper mesh, which has both electrostatic and electromagnetic shielding effects. The shielding materials must be selected with excellent conductive properties, such as copper, aluminum, or silver-plated copper.
4. Filtering technology
The filter is one of the effective methods to communicate the serial mode disturbance. The common filter circuits in the sensor detection circuit include Rc filter, communication power filter and true current power filter.
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