Renesas Electronics. has filed a patent for a system involving a power device for wireless charging of a portable device’s battery. The power device emits a magnetic field with a carrier frequency to power the portable device, which includes various stages to rectify the antenna signal and limit input voltage for the charger IC. GlobalData’s report on Renesas Electronics gives a 360-degree view of the company including its patenting strategy. Buy the report here.

According to GlobalData’s company profile on Renesas Electronics, Under-screen biometric identification was a key innovation area identified from patents. Renesas Electronics's grant share as of January 2024 was 57%. Grant share is based on the ratio of number of grants to total number of patents.

Wireless charging system for portable devices

Source: United States Patent and Trademark Office (USPTO). Credit: Renesas Electronics Corp

The patent application (Publication Number: US20240039336A1) describes a system for wireless charging of a portable device's battery using a power device. The system includes components such as antennas, rectifiers, charge stages, and charger ICs to facilitate the wireless charging process. The portable device is designed to adjust the resonance frequency of its antenna to optimize charging efficiency by detuning it from the carrier frequency of the magnetic field emitted by the power device. Additionally, the system allows for power adjustment based on temperature sensing and charging current requirements, ensuring safe and efficient charging.

Furthermore, the patent application details methods for using the power device and portable device for wireless charging, emphasizing the importance of detuning the antenna's resonance frequency to regulate the input voltage for the charger IC. The methods also outline procedures for adjusting the resonance frequency based on temperature limits and charging current levels to enhance charging performance. Overall, the system and methods described in the patent application aim to improve the wireless charging experience by optimizing power delivery and ensuring safe operation of the charging process.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.