How to reduce the electromagnetic interference of the transformer on the amplifier
Published Time:
2025-06-20
By employing methods such as reasonable layout, shielding measures, using shielded power transformers, and optimizing amplifier design, the electromagnetic interference from the transformer to the amplifier can be effectively reduced, ensuring the normal operation of the circuit.
To reduce the electromagnetic interference from the transformer to the amplifier, several aspects can be addressed:
First, proper layout is key. When installing the transformer, avoid placing it near the amplifier's input circuit, especially devices with ferromagnetic regulators that have stronger stray magnetic fields. The amplifier's wiring should also be properly arranged, with input lines, output lines, and AC power lines separated to avoid parallel wiring and reduce electromagnetic interference.
Second, shielding measures are essential. Electrostatic shielding and magnetic shielding can be used. Electrostatic shielding typically uses materials with high conductivity, such as copper or aluminum, to shield the interference source or the interfered component. Magnetic shielding uses magnetic materials with high permeability, such as permalloy or iron, to create a shield to reduce magnetic field interference. Proper grounding of the shield is also very important; otherwise, it may backfire and increase interference.
In addition, consider using a power transformer with a shielded layer, and add a metal shield between the primary and secondary windings to reduce the distributed capacitance and suppress high-frequency interference signals.
Finally, for the amplifier design, measures can be taken to improve its anti-interference ability, such as optimizing circuit design and selecting appropriate components.
In summary, through proper layout, shielding measures, using shielded power transformers, and optimizing amplifier design, the electromagnetic interference from the transformer to the amplifier can be effectively reduced, ensuring the normal operation of the circuit.
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