Sumner B Marshall, Iii

Title: Innovations by Sumner B. Marshall, III

Introduction

Sumner B. Marshall, III is an accomplished inventor based in Webster, MA (US). He has made significant contributions to the field of motor control technology, holding two patents that showcase his innovative approach to reducing noise and improving efficiency in motor systems.

Latest Patents

One of his latest patents is titled "Digital Noise Reduction for Motors." This invention presents a system and method for reducing fan noise by controlling the drive current to the fan motor. In one embodiment, the system approximates a linear drive using multiple transistors in parallel, which are deployed sequentially. Another embodiment employs a technique to activate and deactivate transistors in discrete steps, achieving the benefits of a linear controller topology.

His second patent, "System for Sharing Power and Signal Pins on a Motor Controller," introduces a technique for sharing power and signal pins on a motor controller. This invention utilizes magnetic switching detected by a Hall sensor as the motor magnet passes, employing a diode or resistor instead of a switch. The design ensures that power transistors are connected to a voltage regulator through a diode or resistor, eliminating the need for switches in the circuit. To prevent simultaneous switching, one embodiment is designed to turn "On" slowly and turn "Off" quickly, utilizing an RC delay for a gradual ramp-up and a fast discharge of gate capacitance with an N-CH transistor.

Career Highlights

Sumner B. Marshall, III is currently employed at Asahi Kasei Microsystems Co., Ltd., where he continues to develop innovative solutions in motor control technology. His work has significantly impacted the efficiency and performance of motor systems.

Collaborations

He collaborates with Mark E. Collins, contributing to advancements in their field through shared expertise and innovative ideas.

Conclusion

Sumner B. Marshall, III is a notable inventor whose patents reflect his commitment to innovation in motor technology. His contributions are paving the way for quieter and more efficient motor systems.