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SamsungGranted patentBatteries & energyInterest 6/10

Samsung patents wireless charger that cuts down on buzzing noise

Patent drawing
Patent drawing from the official filing.

Samsung has been granted a patent for a wireless charging receiver that reduces the audible humming often heard during charging. The design uses a specific circuit arrangement with a capacitor and switch to keep the voltage steady, preventing the coil from vibrating and creating sound.

Why it mattersQuieter charging pads are a small but noticeable improvement for anyone who charges their phone on a desk or nightstand.

In the filing’s own words

A wireless charging system including a wireless charging receiver is provided. The wireless charging receiver may be configured to wirelessly receive electrical power from a wireless charging transmitter. The wireless charging receiver may include an inductor inductively coupled to the wireless charging transmitter, a rectifier connected to the inductor and configured to rectify a signal received from the inductor, a DC-DC converter configured to convert a DC signal received from the rectifier, a switching block configured to receive a common voltage generated from the DC-DC converter and including a first switch, and a first capacitor configured to receive the common voltage from the switching block and connected to the inductor at a first node, wherein the common voltage is not zero.

What exactly they claim (claim 1)

1. A wireless charging receiver configured to wirelessly receive electrical power from a wireless charging transmitter, the wireless charging receiver comprising: an inductor configured to be inductively coupled to the wireless charging transmitter, a rectifier connected to the inductor, the rectifier configured to rectify a signal received from the inductor; a DC-DC converter configured to convert a DC signal received from the rectifier; a switching block configured to receive a common voltage generated by the DC-DC converter, wherein the switching block includes a first switch; a first capacitor configured to receive the common voltage from the switching block at a first terminal of the first capacitor, wherein a second terminal of the first capacitor is connected to the inductor at a first node, and wherein the common voltage is not zero; and a receive controller configured to operate the first switch to switch a voltage at the first terminal of the first capacitor between a voltage at the first node and the common voltage.

Facts

Company
Samsung (Samsung Electronics Co., Ltd.)
Official title
Wireless charging receiver and wireless charging system with reduced audible noise
Patent number
US12756231B2
Application number
18149474
Filed
Jan 3, 2023
Granted
Oct 6, 2026
Inventors
2
Claims
20

Classified under

H02J 50/10 Electricity & electronicsH02M 3/1588 Electricity & electronicsH02M 7/4835 Electricity & electronicsH02J 2207/20 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.