By producing some form of excitation signal, the new-style narrow-band frequency-sweep magnetic descaling instrument forms the electromagnetic field inside the pipeline, so as to achieve the effect of descaling, while the power amplification part of the instrument generally has the disadvantage of poor reliability. This paper puts forward two methods, shortening the distance between driving signal and the gate of transistor, and reducing the number of via holes, to reduce parasitic parameters. Meanwhile, measure the temperature of transistors with a thermistor directly, when the temperature exceeds the threshold, the adjustable rectifier is shut down automatically to protect the H bridge and enhance the reliability of the magnetic descaling instrument. Experiments show that the reliability of modified magnetic descaling instrument has been greatly improved by using the methods proposed.
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