C4.3 - Low Power Design for Wireless Instrumentation

Y. Maret, R. Bloch & D. Schrag
An intrinsically safe and self-supplied wireless adapter has been developed for HART devices. The adapter works with a supply voltage down to 1.2V and a supply current as low as 3mA. To achieve this, analogue and digital low power design approaches, a new intrinsic safety concept, and a novel control scheme are used. The proposed adapter is connected serially to the 4...20mA loop and harvests energy thereof to supply itself. The voltage drop generated by...