Zhijun Liu

Title: Innovations and Contributions of Inventor Zhijun Liu

Introduction

Zhijun Liu is a prominent inventor based in Menomonee Falls, Wisconsin, known for his significant contributions to the field of electrical engineering. With a total of 13 patents to his name, Liu has developed innovative solutions that enhance the efficiency and functionality of power conversion systems.

Latest Patents

Among his latest patents, Liu has designed an adjustable AC/DC conversion topology that regulates isolated DC loads with low AC ripple. This invention includes systems, methods, and power converters that provide regulated individual DC output signals to anode structures. The design utilizes a PWM inverter to generate a first AC signal, a sinewave filter for a filtered AC signal, and a multiphase isolation transformer to deliver a plurality of isolated AC signals. Additionally, a multi-pulse diode bridge rectifier is employed to produce a DC rectifier output signal, complemented by an output filter and a blocking diode to ensure the filtered DC rectifier output signal is achieved.

Another notable patent addresses the mitigation of DC bus over-voltages on common AC bus systems utilizing DC and AC drives. This invention features a line interface filter apparatus that couples a drive or group of drives to a shared multiphase AC bus. It includes individual phase circuits with inductors, tapped resistors, and capacitors designed to optimize performance and enhance system reliability.

Career Highlights

Zhijun Liu has worked with several esteemed companies throughout his career, including Rockwell Automation Technologies Incorporated and Allen-Bradley Company, LLC. His experience in these organizations has allowed him to apply his innovative ideas in practical settings, contributing to advancements in technology.

Collaborations

Liu has collaborated with notable professionals in his field, including Gary Leonard Skibinski and Lixiang Wei. These partnerships have fostered a collaborative environment that encourages the exchange of ideas and the development of cutting-edge technologies.

Conclusion

Zhijun Liu's contributions to electrical engineering through his patents and collaborations highlight his role as a leading inventor in the industry. His innovative solutions continue to impact the field positively, showcasing the importance of creativity and technical expertise in driving advancements.