Yan-Cun Li

Title: Innovations of Yan-Cun Li

Introduction

Yan-Cun Li is a notable inventor based in Hsinchu, Taiwan. He has made significant contributions to the field of LED technology, holding a total of four patents. His work focuses on developing advanced LED driving circuits that enhance efficiency and functionality.

Latest Patents

One of his latest patents is the AC-DC dual-use LED driving circuit. This invention includes an input power circuit, a buck-boost converter, and a Pulse Width Modulation (PWM) signal controller. The buck-boost converter, which consists of a switching transistor and a feedback resistor, receives a current signal output from the input power circuit and drives an LED with a driving signal. The PWM signal controller outputs a PWM signal based on the driving signal, allowing for the sequential turning on and off of the switching transistor. This innovative circuit can dynamically adjust the duty ratio of the PWM signal without the need for an external photocoupler.

Another significant patent is the LED driving device, which is designed to drive N LED strings connected in series, where N is a positive integer greater than 1. This device includes (N-1) switch units, a current source, a detection unit, and a control unit. The ith switch unit connects to the (i+1) LED string in parallel or to the ith LED string in parallel. The current source supplies a driving current to the N LED strings, while the detection unit outputs a detection signal based on the voltage of the current source and reference voltages. The control unit then outputs multiple first control signals to dynamically manage the number of switch units that are turned on.

Career Highlights

Yan-Cun Li is currently employed at Macroblock, Inc., a company known for its innovations in LED technology. His work at Macroblock has allowed him to further develop his expertise and contribute to cutting-edge advancements in the industry.

Collaborations

He collaborates with talented coworkers, including Chin-Chung Cheng and Hsing-Fu Liu, who share his passion for innovation in LED technology.

Conclusion

Yan-Cun Li's contributions to LED technology through his patents and work at Macroblock, Inc. highlight his role as a significant inventor in the field. His innovative designs continue to push the boundaries of what is possible in LED applications.