Roelf Van Der Wal is a notable inventor based in Drachten, Netherlands. He has made significant contributions to the field of electrical engineering, particularly in the development of innovative appliances and power systems. With a total of 6 patents to his name, Van Der Wal continues to push the boundaries of technology.

Latest Patents

One of his latest inventions is an electric toaster with an asymmetric heating effect. This toaster features a first heating element arranged on one side of the toasting compartment and a second heating element on the opposite side. The first heating element is divided into two sub-elements, allowing for a unique toasting experience. The design includes two diodes and a switch that enables users to switch between a normal two-sided toasting mode and an asymmetric single-sided toasting mode. In normal mode, the switch is closed, and the sub-elements receive power during different half-waves of the mains supply voltage, ensuring equal radiant power. In asymmetric mode, the switch is opened, resulting in the first heating element emitting more radiant power than the second.

Another significant patent is a flyback converter with limited output power. This converter utilizes a switcher IC with Pulse Width Modulation control of the switching transistor. The pulse width is adjusted by changing the input current at the control input. Under normal conditions, the voltage at the control input is maintained at a fixed level, which also serves as the supply voltage for the control unit. A charge pump is included to provide extra charge for the smoothing capacitor, preventing the control unit from entering auto-restart mode. This flyback converter can be used as a constant power source for charging rechargeable batteries with a working voltage lower than the nominal operating output voltage.

Career Highlights

Roelf Van Der Wal is currently employed at U.S. Philips Corporation, where he continues to innovate and develop new technologies. His work has had a significant impact on the design and functionality of electrical appliances.

Collaborations

Throughout his career, Van Der Wal has collaborated with notable colleagues, including Jacob H Botma and Wilhelmus G Ettes. These collaborations have contributed to the advancement of various projects and innovations in the field.

Conclusion

Roelf Van Der Wal is a distinguished inventor whose work in electrical engineering has led to several innovative patents. His contributions, particularly

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