Three differences between the output noise voltage and ripple voltage of the USB socket

What is the difference between the output noise voltage and the ripple voltage of the USB socket? In order to answer your questions, the editor of okplazas.com will highlight the three differences between the output noise voltage and the ripple voltage of the USB socket. The details are as follows.

Difference 1: The output noise voltage of the USB socket refers to the noise voltage that changes randomly between the output terminals, and it is also indicated by peak-to-peak value.

Difference 2: The output ripple voltage of the USB socket power supply is usually marked by peak-to-peak value instead of the average value. This is because it is attributed to a high-frequency narrow pulse. When the peak-to-peak value is high (eg ±60mV), and the average value can be only a few millivolts, the peak-to-peak value is more representative. The output ripple voltage is a pulsating voltage that appears between the output terminals and is synchronized with the grid frequency and the USB socket frequency.

Difference 3: The output ripple and noise voltage of the USB socket indicates the sum of the output ripple voltage and the noise voltage under the additional output voltage and load current, also known as the maximum ripple voltage. In order to avoid introducing the radiated noise declared by the switching power supply from the ground clamp of the oscilloscope probe, it is recommended to use shielded wire or twisted pair as the center connection to keep the oscilloscope away from the switching power supply as much as possible. When measuring ripple voltage including high frequency weight, it is recommended to use a 20MHz bandwidth oscilloscope to query the peak-to-peak value.

When we know the difference between the output noise voltage and ripple voltage of the USB socket, it will be more helpful when purchasing the USB socket. If you still don’t understand, you can consult our customer service.