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High Temperature SiC Wireless Telemetry Systems
Keywords: HIgh Temperature, Telemetry, Silicon Carbide
Arkansas Power Electronics International, Inc. (APEI, Inc.) researchers have developed a patent pending high temperature telemetry system capable of operation to temperatures in excess of 450 °C and 17,000 g-forces. With funding from a commercial partner, this research has sought to develop an extreme environment telemetry system capable of operating on a turbine blade in a natural gas power generation turbine. A combination of wireless telemetry and integrated sensors will allow for condition based maintenance of field-operational natural gas turbines, which will completely change the way the natural gas turbine industry does business. This type of preventative maintenance can help to save the power generation industry hundreds of millions of dollars a year, a savings that will be passed on to the consumer. APEI, Inc. developed a SiC based circuit that can acquire a temperature signal from a thermocouple and transmit that temperature information wirelessly to an external receiver. The systems includes circuitry that amplifies the thermocouple input signal to a usable level, circuitry that encodes the local ‘cold-junction’ temperature of the thermocouple/transmitter interface, and finally circuitry which generates an RF carrier which is modulated by the temperature information and transmitted wirelessly. Additionally, power is delivered to the system via an induction power delivery system, allowing for a full wireless telemetry solution. Finally, APEI, Inc. developed advanced packaging methods that allow the circuitry to function both at extreme temperatures and extreme g-forces. This paper will discuss the complete design of the telemetry system, test results, and the high temperature packaging solutions developed for this system.
John R. Fraley, Design Engineer
Arkansas Power Electronics International, Inc.
Fayetteville, AR

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