Wireless power supply patent Japan dominates in smart phones and cars
Contactless power supply technology, also known as wireless power supply, is a method that allows devices to be charged without the need for physical connectors or wires. This innovative approach has been around for a long time and has found applications in various products.
As early as the late 20th century, several products began using non-contact power supply technology, with ongoing research aimed at improving its efficiency and capacity. In 2007, a team from the Massachusetts Institute of Technology (MIT) made a breakthrough by successfully demonstrating high-power, high-efficiency wireless charging over several meters using magnetic resonance. This development sparked widespread interest and accelerated research and development efforts globally.
According to the "2014 Patent Application Technology Trend Survey" conducted by the Japan Patent Office, there was a significant increase in patent applications related to contactless power supply technology. The number of applications rose from 799 in 2006 to 3,905 in 2011, reflecting the growing importance of this field. MIT's research in 2007 played a major role in this surge, leading to increased applications from Japanese and U.S. companies, followed closely by European and South Korean entities.
The main areas of application for contactless power supply include mobile devices such as smartphones and electric vehicles (EVs). Japanese and South Korean manufacturers have shown strong activity in this domain. For example, Seiko Epson, Sony, Panasonic, and Samsung Electronics have filed numerous patents for smartphone-related technologies. Similarly, Japanese automakers like Toyota, Nissan, and Toyota Automatic Weaving Machine have led in EV-related innovations.
Beyond consumer electronics and vehicles, there has been a growing interest in using weak electromagnetic waves in the air for energy harvesting. This technology is especially useful for powering sensors in hard-to-reach or maintenance-intensive environments. While the number of applications remains relatively small, it is gradually increasing, with U.S. and Japanese companies leading the way.
Japanese companies have also taken the lead in addressing key challenges in non-contact power supply, such as foreign object interference, electromagnetic leakage, and misalignment between transmitters and receivers. These technical advancements are reflected in their extensive patent portfolios.
In the field of microwave-based power transmission, Japanese applicants hold the largest share of patents. This highlights Japan’s strong position in developing advanced wireless power solutions. To maintain this advantage, Japanese companies should focus on modularizing components, protecting intellectual property, and continuing to invest in R&D.
Overall, contactless power supply technology is evolving rapidly, with Japan playing a pivotal role in shaping its future. As demand for compact, efficient, and safe wireless charging solutions grows, the global market will continue to benefit from the innovations pioneered by Japanese companies.
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