Location History:
- Bulleskin, PA (US) (1976)
- Connellsville, PA (US) (1980 - 1982)
- West Mifflin, PA (US) (1983)
- Pittsburgh, PA (US) (1984 - 1986)
Company Filing History:
5 out of 8,033 
2 out of 4 Years Active: 1976-1986
Title: The Innovative Contributions of Warren C Fry
Introduction
Warren C Fry is a notable inventor based in Connellsville, PA (US), recognized for his significant contributions to the field of electrical engineering. With a total of seven patents to his name, Fry has developed innovative technologies that enhance the efficiency and functionality of voltage conversion systems.
Latest Patents
Among his latest inventions is the "Direct Current Voltage Converter Apparatus." This device is designed to convert a fluctuating input DC voltage into an isolated and regulated output DC voltage. It operates through a first switch device that charges a capacitor via one primary winding of a transformer, and a second switch device that discharges the capacitor through another primary winding. The load is energized by an output voltage from a first secondary winding when the first switch is conducting, and by a second secondary winding when the second switch is conducting. The switching devices are controlled based on the voltage change across the capacitor.
Another significant patent is the "Multiple Output DC-to-DC Voltage Converter Apparatus." This apparatus energizes two loads from a power supply connected through an inverter and a coupling transformer. The transformer features a first secondary winding that energizes the first load with voltage pulses of variable width, determined by the operational frequency of the inverter. The second secondary winding energizes the second load with voltage pulses whose width is controlled by a phase-controlled switching apparatus, responsive to either the voltage or current of the second voltage pulses.