Hans Doktor

Title: Innovations by Hans Doktor

Introduction

Hans Doktor is a notable inventor based in Aarhus C, Denmark. He has made significant contributions to the field of electrical engineering, particularly in the development of current supply apparatuses and electronic switching circuits. With a total of 2 patents to his name, Doktor's work reflects a commitment to enhancing the efficiency and safety of electrical systems.

Latest Patents

One of Hans Doktor's latest patents is the "Current supply apparatus for an A.C. consumer." This invention focuses on providing galvanic separation between the control portion and the high voltage portion, ensuring rapid interruption of an overcurrent during overload situations, such as short-circuiting. The design incorporates control pulses for the chopper and inverter transistor, which are fed to a base control circuit via an opto-coupler. Additionally, a gate that can be fed with an appropriate blocking signal during overcurrent is strategically placed between the opto-coupler and the base control circuit.

Another significant patent is the "Low power loss snubber for switching power transistors." This invention describes an electronic switching circuit that utilizes a power transistor controlled by a control stage. During the 'on' time for the transistor, a capacitor of a switch-off relief circuit is charged. At the 'turn-off' time, the capacitor discharges through the base-emitter path of the power transistor. This innovative approach allows for a strong base current surge during the switching on of the power transistor, thereby reducing power loss in its switching path.

Career Highlights

Hans Doktor is currently employed at Danfoss A/S, a leading company in the field of engineering and technology. His work at Danfoss has allowed him to apply his innovative ideas in practical applications, contributing to the company's reputation for excellence in electrical solutions.

Collaborations

Throughout his career, Hans has collaborated with several talented individuals, including Kjeld Hellegaard and Niels O Jacobsen. These collaborations have fostered a creative environment that encourages the exchange of ideas and the development of groundbreaking technologies.

Conclusion

Hans Doktor's contributions to electrical engineering through his patents and work at Danfoss A/S highlight his innovative spirit and dedication to improving electrical systems. His inventions not only enhance efficiency but also ensure safety in electrical applications.