Lars Döfnäs

Title: Innovations of Lars Döfnäs

Introduction

Lars Döfnäs is a notable inventor based in Ludvika, Sweden. He has made significant contributions to the field of electrical engineering, particularly in the development of advanced control methods for power electronics. With a total of five patents to his name, Döfnäs has demonstrated a commitment to innovation and technological advancement.

Latest Patents

One of his latest patents is titled "RC-IGBT Switching Pulse Control." This invention presents a method for controlling a first and a second reverse-conducting insulated gate bipolar transistor (RC-IGBT), which are electrically connected in series. The design includes a collector of the first RC-IGBT connected to a positive pole of a direct current voltage source, while the emitter of the second RC-IGBT is linked to the negative pole. The configuration allows for the application of a gate voltage to the respective gates of the RC-IGBTs, which is controlled based on the output current's magnitude and direction.

Another significant patent is "Black Start of a Multilevel Voltage Source Converter." This invention involves a voltage source converter that includes a black start control unit and multiple cells. Each cell is equipped with switches that manage the charging of power supply units, enabling the converter to start from a non-energized state. This innovative approach enhances the reliability and efficiency of voltage source converters in various applications.

Career Highlights

Lars Döfnäs has worked with prominent companies in the industry, including ABB Technology AG and ABB Schweiz AG. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking projects in power electronics.

Collaborations

Throughout his career, Döfnäs has collaborated with talented professionals, including Roland Siljeström and Ying Jiang-Häfner. These partnerships have fostered a creative environment that has led to the development of innovative solutions in the field.

Conclusion

Lars Döfnäs is a distinguished inventor whose work in power electronics has resulted in several impactful patents. His contributions continue to influence the industry and inspire future innovations.