MEMS chip enables battery-free sensors
December 08, 2011 // R. Colin Johnson
A MEMS chip can harvest energy from vibrations inside car tires allowing a tire pressure monitoring systems (TPMS) to run battery-free, according to Belgian research institute IMEC. The new MEMS energy harvester technology from IMEC, which can be used to power any low-current wireless sensor node, was reported Wednesday at the IEEE International Electron Devices Meeting in Washington.
The maximum output of the MEMS energy harvester was just under 500 microWatts at its natural resonant frequency of 1 KHz. Energy generation dropped to just over 40 microWatts in automobile tire traveling at 40 miles per hour, but was still enough to qualify the part for powering the pressure sensor and wireless communications circuitry for TPMS systems, according to IMEC.
The MEMS energy harvester consists of a cantilever with a piezoelectric layer (aluminum nitride) sandwiched between metallic electrodes to form a capacitor. A mass attached to one end of the cantilever, enables it to act as a transducer converting vibrations into electricity as the piezoelectric layer flexes. The voltage across the capacitor can then be harvested to drive wireless circuits.
IMEC demonstrated that the tiny energy harvesters can be packaged using vacuum processing on six-inch wafers. IMEC predicts that its MEMS energy harvester will be used to power wireless sensor nodes in many applications where changing a battery is inconvenient—from automobile engines to industrial appliances.
Machine learning for every app
October 02, 2015
Startup company Dato wants to make a splash in the consumer market by making it easier for developers to integrate machine-learning ...
Cyber threats against cars are here to stay, experts say
BAIC launches R&D centre in Aachen
NXP-Freescale: merger of 'compatible' giants on track
TSMC turns logic FinFET into ReRAM
Invisibility cloak focuses on enhancing solar cell efficiency
October 01, 2015
Scientists of Karlsruhe Institute of Technology (KIT) have discovered an unconventional approach to increasing the efficiency ...
Measuring the most stable light source in the world
3D memory chips may beat 3D hybrid memory cube
Are mushrooms the answer to lithium-ion battery degradation?
- Determine Balancing Current for the LTC3305 Lead-Acid Battery Balancer
- 3 Ways to Simplify Medical Device Testing
- Thread Networking Protocol Simplifies Connecting “Things” in the Home and Beyond
- High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC
InterviewCEO interview: Ambiq sees broader options for low voltage
Mike Noonen, recently appointed interim CEO at microcontroller startup Ambiq Micro, discusses the focus and opportunities for this pioneering company designing circuits that can operate below the threshold ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, LabNation is giving away three of its SmartScope open source USB oscilloscopes, worth 229 Euros each, for EETimes Europe's readers to win.
Successfully funded through Kickstarter last year, the SmartScope is claimed to be the world's first test equipment designed to run on multiple operating systems and platforms such as smartphones, tablets and PCs. It is powered directly from... MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.