Location History:
- Anjo, JP (1999)
- Aichi, JP (2012)
Company Filing History:
2 out of 2,195 
1 out of 190 
Years Active: 1999-2012
Title: Innovations by Yoshiharu Shimizu
Introduction
Yoshiharu Shimizu is a notable inventor based in Aichi, Japan. He has made significant contributions to the field of battery technology, holding a total of 2 patents. His work focuses on enhancing the efficiency and safety of charging circuits for secondary batteries.
Latest Patents
One of his latest patents is a charging circuit for secondary batteries. This invention utilizes an operational amplifier connected to a midpoint between multiple serially connected battery cells. It provides a charging circuit that inhibits charge/discharge current from flowing to the midpoint and controls the input/output current to each battery cell. The circuit includes excess voltage detectors that monitor voltage levels and a charging controller that manages the overcharge state of each battery cell.
Another significant patent is for a battery charger designed for battery packs used in electromotive tools. This charger features a protection arrangement that includes a self-holding protector located near the battery pack insertion hole. The protector consists of two elements connected in parallel: a bimetal that opens when overheated or when excessive current flows, and a positive characteristic thermistor (PCT) that generates heat under current flow. This arrangement ensures that charging stops when a battery pack becomes overcharged or short-circuits.
Career Highlights
Yoshiharu Shimizu has worked with prominent companies such as Makita Corporation and Tamura Corporation. His experience in these organizations has contributed to his expertise in battery technology and innovation.
Collaborations
Some of his notable coworkers include Masahiko Sakou and Masatoshi Sugiura. Their collaboration has likely fostered an environment of innovation and creativity in their respective projects.
Conclusion
Yoshiharu Shimizu's contributions to battery technology through his patents demonstrate his commitment to innovation and safety in electrical engineering. His work continues to influence the development of efficient charging systems for modern battery applications.