Company Filing History:
Years Active: 2005-2009
Title: Earl F. Crandall: Innovator in Electronic Ballast Technology
Introduction
Earl F. Crandall is a notable inventor based in Raleigh, NC (US), recognized for his contributions to electronic ballast technology. With a total of 6 patents, Crandall has made significant advancements in the field of lighting systems, particularly in the efficient operation of gas discharge lamps.
Latest Patents
Crandall's latest patents include a high-frequency electronic ballast with a sine wave oscillator. This innovative design generates a high-frequency sinusoidal wave that is applied directly to a gas discharge lamp, enhancing power efficiency. By uniting a high-frequency current-fed oscillator with a transformer, the system allows direct current to be applied to the center tap of the transformer primary winding. This enables the generation of a sinusoidal alternating current at the secondary winding, which is then applied directly to the gas discharge lamp. Feedback from the transformer plays a crucial role in controlling the oscillator's switching at resonant frequency.
Another significant patent is the method and system for driving a plasma-based light source. In this design, a gas discharge lamp is driven with a constant current square wave from a current transformer. The system is engineered so that the voltage rises to the required ionization potential for the lamp at the start of each square wave, ensuring efficient operation. As the lamp ionizes the gas and current flows, the voltage drops to maintain the desired current level, preventing excessive power pulses and reducing the creation of infrared photons. This continuous driving of the plasma at a stable current level enhances the lamp's efficiency, requiring less energy for the same light output.
Career Highlights
Throughout his career, Earl F. Crandall has worked with several companies, including Purespectrum, Inc. and Transworld Lighting, Inc. His work has focused on developing technologies that improve the efficiency and performance of lighting systems.
Collaborations
Crandall has collaborated with notable individuals in the industry, including Robert C. Smallwood, Sr. and Ray J. King. These collaborations have contributed to the advancement of innovative lighting solutions.
Conclusion
Earl F. Crandall's contributions to electronic ballast technology and gas discharge lamps have made a significant impact on the lighting industry. His innovative patents reflect a commitment to enhancing energy efficiency and performance in lighting systems.