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Name of experiment：design of power amplifier driving alternating electromagnetic coil

Research direction：drive of alternating electromagnetic coil

Power amplifier as a medium that amplifies signal waves between signal source and the exciting element (for example: the ultrasonic transducer, the electromagnetic coil, etc.), in scientific research, you can customize parameters through the power amplifier to drive the components to work, it has the advantages of wide adjustable range, high stability, save the lab homemade circuit time costs, improve the efficiency of the experiment, which are deeply favored by the majority of scientific researchers

In this experiment, the ATA-3090 power amplifier is used as the bridge device between the signal generator and the electromagnetic coil, and the signal sent by the signal generator is amplified to drive the electromagnetic coil to generate the corresponding magnetic field. The system design will be used to explore the impact of electromagnetic field on organisms, cleverly avoid the complicated matters brought by hardware and software design, so as to effectively improve the progress of experimental exploration

The driving system of alternating electromagnetic coil is shown in Figure 1, which is mainly composed of signal generator, power amplifier (ATA-3090, as shown in Figure 2) and electromagnetic coil. The signal generator sets the emission parameters of the electromagnetic coil, such as voltage, current, and frequency. The output to the power amplifier for signal amplification, transmission to the electromagnetic coil to generate the corresponding magnetic field, the electromagnetic coil is composed of enameled copper wire coil, coil diameter and the number of turns can be selected according to the specific experimental sample.  

FIG. 1 Driving system diagram of alternating electromagnetic coil : 1 is signal generator, 2 is power amplifier, 3 is electromagnetic coil

After the coil is customized, a signal generator is used to set the magnetic field emission parameters, which are amplified and output by a power amplifier to drive the electromagnetic coil to generate a magnetic field, as shown in Figure 3

Result of experiment：

Signal generator parameters were set as 50kHz, 3vP-P sine wave output, power amplifier amplification was set as 25 times, and the magnetic field intensity generated by the electromagnetic coil was tested by gauss meter. The test results show that the electromagnetic field frequency is 50kHz consistent with the set value (if the output frequency value of the signal generator is changed, the electromagnetic field frequency will also change). The oscilloscope is used to observe the electromagnetic field waveform, and the signal waveform is very smooth and without distortion, indicating that the system design is feasible

In an environment of 26℃, the system was turned on and tested. After 72 hours of continuous operation, the system still operated normally, and the magnetic field intensity and frequency signal did not drifted, proving that the system was relatively stable.