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1、 What do the nominal voltage and current of a power adapter (hereinafter referred to as a power supply) mean? Firstly, the nominal voltage of a general power supply refers to the open circuit output voltage, which is the voltage when there is no external load and no current output. Therefore, it can also be understood that this voltage is the upper limit of the power supply output voltage.

Generally speaking, there are several reasons for the whistling of switch mode power supplies. Poor paint immersion of transformers includes the absence of varnish immersion. Screaming and causing sharp spikes in the waveform, but generally with normal load capacity. It should be noted that the higher the output power, the stronger the whistling, while the lower the power, the less obvious the performance may be.