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Samsung patents converter that hides electrical hum by shifting frequency

Patent drawing
Patent drawing from the official filing.

Samsung has filed a patent for a power management circuit that adjusts its operating speed to avoid making a audible buzzing sound. The system monitors the electrical load and shifts the switching frequency to a lower, inaudible range when the standard frequency would produce noise.

Why it mattersThis improves the quietness of electronic devices by preventing internal components from vibrating at frequencies humans can hear.

In the filing’s own words

A method of controlling a bidirectional switching converter including a switching node is provided. The method includes: generating a first signal having a first frequency; controlling the first frequency based on a level of a load current; generating a second signal having a second frequency; controlling the second frequency to 1/N times the first frequency, while the first frequency is within a reference frequency range, wherein N is a natural number greater than or equal to 2; controlling the second frequency to be equal to the first frequency, while the first frequency is outside the reference frequency range; and turning on a first transistor to precharge the switching node or a second transistor to discharge the switching node, based on the second signal.

What exactly they claim (claim 1)

1. A method of controlling a bidirectional switching converter including a switching node, the method comprising: generating a first signal having a first frequency; controlling the first frequency based on a level of a load current; generating a second signal having a second frequency; controlling the second frequency to 1/N times the first frequency, while the first frequency is within a reference frequency range, wherein N is a natural number greater than or equal to 2; controlling the second frequency to be equal to the first frequency, while the first frequency is outside the reference frequency range; and turning on a first transistor to precharge the switching node or a second transistor to discharge the switching node, based on the second signal.

Facts

Company
Samsung (SAMSUNG ELECTRONICS CO., LTD.)
Official title
ELECTRICAL DEVICE INCLUDING SWITCHING CONVERTER WHICH CONTROLS A SWITCHING FREQUENCY TO BE OUTSIDE AN AUDIBLE NOISE RANGE
Publication number
US20260302917A1
Application number
19696735
Filed
Jun 3, 2026
Published
Oct 1, 2026
Inventors
6
Claims
20

Classified under

H02M 1/0035 Electricity & electronicsH02M 3/1588 Electricity & electronics
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.