Location History:
- Muskego, WI (US) (1997 - 2014)
- New Berlin, WI (US) (2016)
Company Filing History:
4 out of 205 
1 out of 362 
3 out of 832,812 Years Active: 1997-2016
Title: **Douglas W Karraker: Innovator in Voltage Measurement and Circuit Detection**
Introduction
Douglas W Karraker is a prominent inventor based in Muskego, Wisconsin, who has made significant contributions to electrical engineering. With a total of seven patents to his name, Karraker has focused his innovations on improving voltage measurement techniques and detection systems in electrical circuits.
Latest Patents
Karraker's latest patent is a "DC bus voltage measurement circuit," which presents a novel voltage measuring device. This device is designed to be connected to the secondary of an inductive coupling in a DC to DC voltage converter. The circuit features a switch that creates a discharge path parallel to a sampling capacitor, depending on whether the input voltage exceeds a specific threshold. Along with this, Karraker has developed a method for "detection of welded switch contacts in a line converter system." This innovative system utilizes a combination of inverter and utility switches, a voltage detector, and an electronic controller to identify occurrences of welded contacts within the circuit, enhancing the reliability of DC to AC power conversion processes delivered to the utility grid.
Career Highlights
Karraker has held notable positions at companies such as ABB Inc., where he further honed his expertise in electrical systems and innovations. His work in this field has positioned him as a key contributor to advancing technology in voltage measurement and circuit diagnostics.
Collaborations
Throughout his career, Karraker has collaborated with talented individuals like Kalyan P Gokhale and Samuli J Heikkilä. These partnerships have enabled the sharing of knowledge and expertise, further enhancing the innovative outcomes of their projects.
Conclusion
Douglas W Karraker's contributions to the field of electrical engineering underscore the importance of innovation in developing efficient and reliable systems. His patents not only reflect his ingenuity but also serve to inspire future generations of inventors in the realm of electrical technology.