Chun-Fu Chang

Title: Innovations of Chun-Fu Chang

Introduction

Chun-Fu Chang is a notable inventor based in Hsinchu, Taiwan. He has made significant contributions to the field of power supply technology, holding 2 patents that showcase his innovative approach to electrical engineering.

Latest Patents

His latest patents include a power supply device and a pulse frequency modulation method. The power supply device features a pulse frequency modulation controller circuitry and a cycle controller circuitry. The pulse frequency modulation controller circuitry is designed to adjust the transiting speed of a first signal based on at least one control bit. It compares the first signal with a first reference voltage to generate a second signal, which is then used to create a driving signal for a power converter circuit. This circuit is responsible for generating the output voltage according to the driving signal. The cycle controller circuitry detects the frequency of the driving signal using a clock signal with a predetermined frequency, which is set within the audible range for humans.

The pulse frequency modulation control circuit includes a switching circuit, a slope-decision circuit, a flip-flop, and two comparison circuits. The first comparison circuit outputs a first signal based on the output voltage of a power conversion circuit. The switching circuit generates a switching signal according to the output current of the power conversion circuit. The slope-decision circuit determines a slope modulation voltage, which can have either a first or a second slope based on the switching signal. The second comparison circuit outputs a second signal according to the slope modulation voltage, while the flip-flop produces a control signal for the power conversion circuit based on the first and second signals. The control signal's frequency varies according to the slope modulation voltage.

Career Highlights

Chun-Fu Chang is currently employed at Realtek Semiconductor Inc., where he continues to develop innovative technologies in the semiconductor industry. His work has significantly impacted the efficiency and functionality of power supply systems.

Collaborations

He collaborates with talented coworkers, including Shih-Cheng Wang and Shih-Chieh Chen, contributing to a dynamic and innovative work environment.

Conclusion

Chun-Fu Chang's contributions to power supply technology through his patents reflect his expertise and commitment to innovation. His work at Realtek Semiconductor Inc. continues to influence advancements in the field.