Location History:
- Osaka, JP (2004 - 2009)
- Hyogo, JP (2009 - 2016)
Company Filing History:
5 out of 16,453 
5 out of 27,375 
1 out of 13,307 Years Active: 2004-2016
Title: Hirokuni Fujiyama: Innovator in Voltage Detection Circuits
Introduction
Hirokuni Fujiyama is a prominent inventor based in Hyogo, Japan. He holds a total of 11 patents that showcase his expertise in electrical engineering and circuit design. His innovative contributions have significantly impacted the field of voltage detection and reference voltage generation.
Latest Patents
Fujiyama's latest patents include a voltage detection circuit that features a reference voltage and current supply. This circuit is designed to generate a reference voltage and a reference current. It incorporates a switching element that transitions from an off-state to an on-state when the reference voltage exceeds a predetermined threshold voltage. Additionally, a current mirror circuit allows a current corresponding to the reference current to flow through the switching element when it is in the on-state. A capacitive element is coupled in series to the current mirror circuit, charging with the current flowing through the switching element. An inverter is configured to output an enable signal based on the terminal voltage of the capacitive element.
Another notable patent is the reference voltage generation circuit with a start-up circuit. This circuit includes a first resistance element connected between a first rectifying element and an output node where the reference voltage is generated. Second and third resistance elements are connected in series between a second rectifying element and the output node. A differential amplifier outputs a control voltage based on the difference between two generated voltages. A control circuit supplies a control current corresponding to this control voltage. The start-up circuit facilitates the transition from a first stable state to a second stable state by supplying a start-up current to the output node in response to the power supply voltage.
Career Highlights
Fujiyama has worked with notable companies such as Panasonic Corporation and Matsushita Electric Industrial Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to various innovative projects.
Collaborations
Throughout his career, Fujiyama has collaborated with talented individuals, including Takashi Morie and Shiro Dosho. These collaborations have fostered a creative environment that has led to significant advancements in their respective fields.
Conclusion
Hirokuni Fujiyama is a distinguished inventor whose work in voltage detection circuits and reference voltage generation has made a lasting impact. His innovative patents and collaborations highlight his commitment to advancing technology in electrical engineering.