New temperature sensors will enhance the energy efficiency of wearable devices

Recently, scientists at the University of California, San Diego, developed a new "near zero loss" temperature sensor that operates at just 113 Pw (1 billionth of a watt). This means that the new temperature sensor requires only a small amount of electrical energy to function properly. The findings appear in the journal Science.

Engineers believe the sensor can enhance the energy efficiency of wearable devices, implants, and other environmental monitoring technologies. New sensors have prompted such devices to specifically draw electrical energy from the energy created by the instrument itself and its surroundings.

Patrick Messier, a professor of electrical engineering at Jacobs College of Engineering in San Diego, and lead investigator for the study, said: "We wanted wearables to be unobtrusive and make people unaware of the devices. One day the new technology will keep us from having to replace the batteries. "

The new sensor has 628 times lower power than the most energy-efficient sensors using temperature monitoring technology such as medical implants and smart thermostats. Researchers also said that many researchers are trying to solve the problem of gate leakage current, but the use of gate leakage current to construct an ultra-low power current-source transistors.

Researchers have developed a low-power conversion method. The resistor responds to temperature and the resistance voltage is affected. Finally, the voltage will be converted to the corresponding temperature value. The new sensor utilizes two low-power currents, one of which is temperature-synchronized and the other of which is time-synchronized. The electronic feedback loop ensures that both currents flow in synchronism by changing the temperature-sensitive current capacitor size. As the temperature drops, the current speed will slow down. Therefore, the feedback loop reduces the capacitor size to ensure current synchronization. This change of capacitor will record the temperature change on a small chip.

Taking into account the overall energy efficiency issues, the new sensor response rate can only update the temperature once per second, which is slightly slower than the existing temperature sensor. But for wearable devices, smart home, etc. less demanding on the occasion of the change rate of the occasion, the response time is sufficient.

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