Company Filing History:
2 out of 7 
2 out of 7 
1 out of 832,843 Years Active: 2008-2020
Title: The Innovations of Chi Keung Tang
Introduction
Chi Keung Tang is a notable inventor based in Hong Kong, CN. He has made significant contributions to the field of semiconductor technology and LED lighting. With a total of five patents to his name, Tang has demonstrated a commitment to advancing innovation in his areas of expertise.
Latest Patents
One of Chi Keung Tang's latest patents is a semiconductor device designed for high voltage isolation. This device includes a substrate of a first conductivity type with relatively low impurity concentration. It features a first region of a second conductivity type, also with low impurity concentration, located within the substrate. Additionally, there is a second region of the first conductivity type with relatively high impurity concentration, also situated in the substrate. The device incorporates first and second conductors located on the first region, separated by an isolator layer, and a third conductor located on the second region, also separated by the isolator layer. The first conductor serves as a drain terminal, the second as a source terminal, and the third as a gate terminal.
Another significant patent by Tang is for a direct drive LED lighting circuit. This circuit includes an LED current control circuit with a power switching device, a current sensing device, an averaging circuit, and an error amplifier. The LED chain circuit is formed by connecting several LEDs in series, with a capacitor connected in parallel. The current flows in from a positive terminal and leaves through a negative terminal. The LED chain circuit and the LED current control circuit are connected in series, with the entire setup linked to the positive and negative terminals of a rectified AC power source.
Career Highlights
Chi Keung Tang has worked with several companies, including Mosway Semiconductor Limited and Mosway Technologies Limited. His experience in these organizations has contributed to his development as an inventor and innovator in the semiconductor and LED lighting fields.
Collaborations
Some of his notable coworkers include Peter On Bon Chan and Celement Chiu Sing Tse. Their collaboration has likely fostered an environment of innovation and creativity in their respective projects.
Conclusion
Chi Keung Tang's contributions to semiconductor technology and LED lighting exemplify his innovative spirit and dedication to advancing technology. His patents reflect a deep understanding of electrical engineering and a commitment to improving existing technologies.