Renesas Presents Wireless Power Transmitter Technology for Portable Device Charging at ISSCC

Renesas Electronics Corporation, a premier supplier of advanced semiconductor solutions, announced that the company is presenting advancements of charging technology for mobile devices at the prestigious International Solid-State Circuits Conference (ISSCC) in San Francisco, February 19-23. During the conference, Renesas describes its single-chip wireless power transmitter solution that measures AC and DC transmitter power for improved accuracy and safety. The presentation also includes details of a transmitter technology with adaptive Zero-Voltage Switching (ZVS) that achieves reduced electromagnetic interference (EMI) and higher power transmission efficiency. These technical capabilities enable wireless power transmission up to 15W with a Qi power receiver (PRx) and up to 40W with proprietary PRx solutions. (Graphic: Business Wire) DC and AC Coil Current Sensing and Foreign Object Detection Renesas is the first in the industry to develop single-chip transmitter (Tx) technology that can directly measure both DC and AC power transmission components. With this approach, transmitted power can be measured more accurately, providing a means to accurately detect a mismatch between the power transmitter (PTx) and the PRx power levels. Furthermore, DC and AC coil current sensing can detect if a small metal foreign object, such as a paper clip, is caught between the transmitter an...