Pioneering Power Solutions Since 1971
TOHSEI (TOKYO RECTIFIER CO.,LTD.) has been at the forefront of power technology innovation for over five decades, delivering reliable, efficient, and sustainable energy solutions to industries worldwide.
Our Story
Founded in 1971 in Kawasaki, Japan, TOHSEI (TOKYO RECTIFIER CO.,LTD.) began as a specialized manufacturer of industrial battery chargers. From our humble beginnings with ¥1 million in capital, we have grown into a leading innovator in power solutions.
Our journey has been marked by continuous innovation, strategic partnerships, and an unwavering commitment to quality. Today, we are recognized as a pioneer in DC power supply systems, renewable energy integration, and sustainable power technologies.
With certifications from NEDO and designation as a Zero Emission Challenge company by METI, we continue to drive the transition to clean, efficient energy systems.
Company Profile
Our Journey
Five decades of innovation and growth
Company Founded
Established in Kawasaki with ¥1M capital, specializing in industrial battery chargers.
Capital Partnership
Capital alliance with Honda Denki K.K., capital increased to ¥2M.
Major Partnerships
Business partnerships established with Mitsubishi Heavy Industries and Nippon Sharyo.
Patent Granted
Charging device and method patent No. 4499164 obtained.
Kawasaki Brand Recognition
DC-powered LED lighting system selected for Kawasaki Environmental Showcase. Certified as Kawasaki Monozukuri Brand.
NEDO & METI Recognition
NEDO project adoption. Certified as Zero Emission Challenge company by METI.
Leadership Message
Guiding our vision for sustainable energy
"At TOHSEI, we believe that sustainable energy is not just an option—it's our responsibility. For over 50 years, we have dedicated ourselves to developing power solutions that protect our planet while powering progress. Our commitment to innovation and quality remains unwavering as we work towards a carbon-neutral future."
Akitoshi Kato
President & CEO
Trusted Partners
Collaborating with industry leaders
Mitsubishi Heavy Industries
Nippon Sharyo
Iwasaki Electric
Kowa Corporation
Join Our Journey
Discover how TOHSEI can power your next project with innovative, sustainable solutions.
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