Hiroyuki Murakami

Title: Hiroyuki Murakami: Power Conversion and Control Innovations.

Introduction

Hiroyuki Murakami is an inventor associated with Kyoto, Japan, and Rohm Co., Ltd. His patent work focuses on power-conversion technologies, including isolated DC/DC converters and power factor correction circuits. His listed portfolio includes 2 patents.

Latest Patents

Murakami’s listed patents address power adapters and electronic devices, with an emphasis on efficient and controlled power conversion.

- **Isolated DC/DC converter, primary side controller, power adapter, and electronic device.** This invention describes an isolated converter using a transformer, switching transistor, rectifier, and photocoupler-based feedback. Its circuitry converts the photocoupler’s collector current into a feedback voltage, then uses a pulse signal and driver to control the switching transistor in response to the converter’s output voltage.

- **Power factor correction circuit for regulating operating frequency control circuit of power factor correction circuit and control method thereof, electronic apparatus, and power adapter.** This invention describes a two-channel power factor correction control circuit. An error amplifier and pulse modulator generate signals for the two channels, while the control system switches between operation with a 180-degree phase difference and a mode that alternates use of the channels.

Career Highlights

Murakami’s listed inventions demonstrate work on feedback control, switching regulation, and power factor correction. These technologies are relevant to power adapters and electronic equipment that require regulated, efficient power conversion.

Collaborations

Murakami is associated with Rohm Co., Ltd. His listed coworkers include Takumi Oe and Hiroki Kikuchi.

Conclusion

Hiroyuki Murakami’s patent portfolio reflects a focus on practical power electronics, particularly isolated DC/DC conversion and multi-channel power factor correction.