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How can I stop my inverter from making noise? 

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The proposed inverter shows much improved switching characteristics including higher voltage gain, wider swing range, and higher noise margins compared to the conventional inverter with an enhancement load.
It is found that inserting optical filters in the input signal channel and/or in the pump channel can reduce effective noise figure of the spectral inverter.
This topology also exhibits better electromagnetic-interference noise immunity when compared to a traditional voltage-source inverter (VSI).
Proceedings ArticleDOI
P.K. Hinga, Tokuo Ohnishi, Takayuki Suzuki 
20 Jun 1994
67 Citations
The new type of PWM inverter presented has many features such as good output waveform, small size of filter, low switching losses, and low acoustic noise.
It is necessary to know the mechanical resonances to optimize the switching scheme of the inverter to reduce the noise emission.
For an inverter, noise can produce significant DC offset at the output.
Proceedings ArticleDOI
Zhihao Fang, Dong Jiang, Zewei Shen, Ronghai Qu 
26 Mar 2017
23 Citations
In the meantime, increasing of switching frequency of inverter can bring bigger EMI noise at EMI low frequency range.
Since the switches of power devices are randomized, the acoustic noise generated by the voltage and current harmonics of inverter control can be significantly reduced.
It is demonstrated that the proposed inverter shows a full-swing characteristic, large inverting gain and high noise margin with only two OTFTs.
Experimental results verify that the proposed inverter shows lower noise and higher efficiency than conventional inverter.
Furthermore, we show that the noise margin of the inverter can also be controlled by adding a biased TG to the driving TFT.
Simulation results demonstrate the effectiveness of these schemes in reducing inverter switching losses and reducing acoustic noise of variable-frequency drive.
As a general conclusion, it may be stated that only a total analysis of the inverter-motor system can lead to an appropriate analysis for audible noise.<<ETX>>
Therefore, the noise immunity of the inverter is also improved greatly.
Thus, a robust inverter system can be achieved.

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