Location History:
- Moriguchi, JP (1988)
- Hirakata, JP (1988 - 2001)
Company Filing History:
11 out of 27,375 
1 out of 123 Years Active: 1988-2001
Title: **Inventor Spotlight: Yoshiaki Doyama from Hirakata, Japan**
Introduction
Yoshiaki Doyama is a prolific inventor located in Hirakata, Japan, known for his innovative contributions to electrical engineering. With a remarkable total of 11 patents to his name, Doyama has significantly impacted the development of converter circuits and brushless motor technologies.
Latest Patents
Doyama's latest patents showcase his expertise in circuit design and control systems. One of his key inventions is a **converter circuit having control means with capability to short-circuit converter output**. This circuit includes a reactor connectable to an AC power supply and features a PWM converter circuit that incorporates high-speed diodes and rectifier elements. The innovative control device measures variations in output voltage to optimally manage the power supply frequency, thereby enhancing overall efficiency and reliability.
Another significant patent is for a **brushless motor driving circuit and a method of controlling the brushless motor driving circuit**. This invention improves the startup process of brushless motors by maintaining appropriate voltage levels during startup and transitioning seamlessly to normal control without requiring a complex switching operation. This clever design not only simplifies the control process but also optimizes the motor's performance based on its rotational speed and load conditions.
Career Highlights
Throughout his career, Yoshiaki Doyama has worked with esteemed companies, including Matsushita Electric Industrial Co., Ltd. and Matsushita Refrigeration Company. His tenure at these organizations allowed him to refine his skills and contribute innovative solutions in the electronics industry, especially in the fields of motor control and power electronics.
Collaborations
Doyama has collaborated with notable colleagues such as Masataka Ozeki and Keizo Matsui. These partnerships have fostered an environment of creativity and innovation, leading to the development of impactful technologies that have shaped the landscape of electrical engineering applications.
Conclusion
Yoshiaki Doyama is a noteworthy figure in the realm of inventors, with a portfolio of patents that emphasize his contributions to electrical circuitry and motor control technology. His work continues to inspire advancements in the field, making significant strides toward more efficient and effective systems. As a dedicated innovator from Hirakata, Doyama's legacy is sure to influence future generations of engineers and inventors.