Timothy E Graff

Title: Timothy E. Graff and His Flyback Power Supply Patent

Introduction

Timothy E. Graff is an inventor associated with Palatine, Illinois, and Motorola Corporation. His patent work includes an invention for a flyback power supply with a sample-and-hold feedback path.

Latest Patents

Graff is credited with 1 patent, titled “Flyback Power Supply.” The invention describes a pulse-width modulation circuit that controls current pulses through a transformer’s primary winding. The transformer’s secondary winding connects to a rectifier circuit, which provides a DC voltage at the output.

The patent’s selective feedback path uses a sample-and-hold circuit to connect the output to the pulse-width modulation circuit’s sense input during energy storage, when transformer flux is increasing. When energy transfers from the transformer to the rectifier and the flux decreases, the circuit effectively disconnects the output from the sense input. A series-pass transistor and holding capacitor form the sample-and-hold circuit, with the transistor switched according to the pulse-width modulation circuit’s control signal.

Career Highlights

Graff’s documented patent contribution concerns power-supply design and feedback control. The patent identifies Motorola Corporation as his company affiliation.

Collaborations

Michael A. Loda and Gregory A. Peterson are listed as Graff’s coworkers. The available information does not specify their roles in the patent or whether they collaborated on this invention.

Conclusion

Timothy E. Graff’s patent describes a controlled feedback approach for a flyback power supply, reflecting his documented work in power electronics at Motorola Corporation.