Takeshi Ohi

Title: Innovator Takeshi Ohi: Pioneering Advances in Semiconductor Technology

Introduction

Takeshi Ohi, a notable inventor based in Tokyo, Japan, has made significant contributions to the field of semiconductor technology. With an impressive portfolio of seven patents, Ohi's innovations have focused on enhancing the performance and reliability of semiconductor devices in challenging environments.

Latest Patents

Among his latest inventions is a revolutionary semiconductor device designed to monitor the temperature of semiconductor chips accurately. This device functions effectively even in noisy environments and eliminates the need for highly accurate detection circuits. By bonding a PTC (positive temperature coefficient) element onto an IGBT (Insulated Gate Bipolar Transistor) chip, Ohi's device allows constant current flow from a constant current source through the PTC element. The output voltage of the PTC element is then monitored, and any increase triggers a reduction in the gate electrode voltage, ensuring high precision in temperature monitoring.

Another noteworthy patent of Ohi's is a drive circuit for power semiconductor devices. This circuit includes a sampling signal generating circuit that detects input control signals indicating an OFF state and outputs a sampling signal at the start of the Miller period of the IGBT. The system accurately detects the Miller voltage and issues an over-current detection signal when this voltage surpasses a certain threshold. The gate voltage controlling circuit then adjusts the gate voltage, allowing for a slower turn-off pace for the IGBT, which significantly suppresses surge voltage during over-current flow.

Career Highlights

Takeshi Ohi has had the opportunity to work with prominent companies, including Mitsubishi Denki Kabushiki Kaisha and Mitsubishi Electric Corporation. His time at these organizations has enabled him to hone his skills in semiconductor technology and develop groundbreaking innovations.

Collaborations

Throughout his career, Ohi has collaborated with notable colleagues such as Toshiyuki Kikunaga and Hirotaka Muto. These partnerships have fostered a productive environment for brainstorming and innovating, contributing to the advancements in his field.

Conclusion

With his impressive array of patents and noteworthy innovations, Takeshi Ohi stands out as a key figure in semiconductor technology. His work not only progresses the field but also enhances the reliability and efficiency of electronic devices in diverse applications. As he continues to innovate and advance technology, Ohi's contributions will undoubtedly leave a lasting impact in the industry.