Supraharmonic emission in the frequency range 2 kHz to 150 kHz is growing since more and more electronic mass-market devices are equipped with energy efficient self-controlled switching topologies. Since the audible range up to 20 kHz is covered by supraharmonic emission, it raises the question if these devices are producing considerable disturbing noises. This paper gives an overview of the sound generation mechanism in electronic devices. The impact of supraharmonics on the noise emission of household equipment is studied by a measurement survey with 103 devices.
In this paper, the impact of supraharmonic disturbances on electronic mass-market equipment concerning the equipment's lifetime by the aging of the built-in electrolytic capacitors for voltage smoothing is described. In order to get an overview of the impact of the supraharmonic distortion, the increasing input currents of two typical household devices by applying an additional supraharmonic grid voltage distortion of up to 7 V are shown. Due to this additional stress, the aging of the built-in electrolytic capacitors is accelerated and will be analyzed. Therefore, different parameters of a typically used electrolytic capacitor like the core temperature, the frequencyand temperature-dependent equivalent series resistance and the overall thermal resistance are measured and calculated. Based on these values, a lifetime multiplier is computed for different ambient temperatures, ripple frequencies and ripple current amplitudes to assess the impact of these parameters on the capacitor's and thus the devices' lifetime.
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