A zero-power wakeup scheme for energy-efficient sensor applications is presented in this study ba... more A zero-power wakeup scheme for energy-efficient sensor applications is presented in this study based on a piezoelectric MEMS energy harvester featuring wafer-level-integrated micromagnets. The proposed setup overcomes a hybrid assembly of magnets on a chip-level, a major drawback of similar existing solutions. The wakeup device can be excited at low frequencies by frequency up-conversion, both in mechanical contact and contactless methods due to magnetic force coupling, allowing various application scenarios. In a discrete circuit, a wakeup within 30–50 ms is realized in frequency up-conversion at excitation frequencies < 50 Hz. A power loss in the off state of 0.1 nW renders the scheme virtually lossless. The potential extension of battery lifetime compared to cyclical wakeup schemes is discussed for a typical wireless sensor node configuration.
2021 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers), 2021
A miniaturized, magnetically actuated MEMS energy harvester with a high power density is presente... more A miniaturized, magnetically actuated MEMS energy harvester with a high power density is presented. The device can be excited contactless and at low frequencies thanks to an efficient frequency-up conversion. These characteristics render the harvester suitable for various applications like a compact micropower supply in the sense of classical energy harvesting, but also as a near-zero power wakeup device and for energy transfer in inaccessible locations. Power output up to 100 µW in resonance is reported. Pulse-like excitation in the frequency-up conversion scheme yields open-circuit voltages of up to 4 V. A near-zero power wakeup for stand-alone systems like sensor nodes is demonstrated with a wakeup time of 20 ms and 0.1 nW power consumption when deactivated.
A zero-power wakeup scheme for energy-efficient sensor applications is presented in this study ba... more A zero-power wakeup scheme for energy-efficient sensor applications is presented in this study based on a piezoelectric MEMS energy harvester featuring wafer-level-integrated micromagnets. The proposed setup overcomes a hybrid assembly of magnets on a chip-level, a major drawback of similar existing solutions. The wakeup device can be excited at low frequencies by frequency up-conversion, both in mechanical contact and contactless methods due to magnetic force coupling, allowing various application scenarios. In a discrete circuit, a wakeup within 30–50 ms is realized in frequency up-conversion at excitation frequencies < 50 Hz. A power loss in the off state of 0.1 nW renders the scheme virtually lossless. The potential extension of battery lifetime compared to cyclical wakeup schemes is discussed for a typical wireless sensor node configuration.
2021 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers), 2021
A miniaturized, magnetically actuated MEMS energy harvester with a high power density is presente... more A miniaturized, magnetically actuated MEMS energy harvester with a high power density is presented. The device can be excited contactless and at low frequencies thanks to an efficient frequency-up conversion. These characteristics render the harvester suitable for various applications like a compact micropower supply in the sense of classical energy harvesting, but also as a near-zero power wakeup device and for energy transfer in inaccessible locations. Power output up to 100 µW in resonance is reported. Pulse-like excitation in the frequency-up conversion scheme yields open-circuit voltages of up to 4 V. A near-zero power wakeup for stand-alone systems like sensor nodes is demonstrated with a wakeup time of 20 ms and 0.1 nW power consumption when deactivated.
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Papers by Minhaz Ahmed