Wiegand sensor

The consistency of the pulses produced by Wiegand sensors can also be used to provide energy for ultra-low power electronics to be operated using a single pulse. In addition, successive pulses can be stored to offset energy demand of low-power energy circuits. Alternatively, the pulses can be used to trigger, or ‘wake-up’, intermittently powered electronic circuits.{{Cite journal|title=Low-Power Energy Harvesting Solutions for Wiegand Transducers|url=https://ieeexplore.ieee.org/document/7089155|year=2015 |doi=10.1109/JESTPE.2015.2424598 |s2cid=42681896 |archive-url=|archive-date=|access-date=|last1=Saggini |first1=Stefano |last2=Ongaro |first2=Fabio |last3=Corradini |first3=Luca |last4=Affanni |first4=Antonio |journal=IEEE Journal of Emerging and Selected Topics in Power Electronics |volume=3 |issue=3 |pages=766–779 |url-access=subscription }}

In certain applications, both functions of the pulses (magnetic sensing and energy harvesting) are exploited. The pulse energy is used to power ultra-low power circuitry or ICs which, in turn, use the timing of the pulses to perform calculation tasks (e.g. count event data).{{Cite journal|title=Google Scholar|url=https://scholar.google.com/scholar_lookup?title=Battery-less+hall+sensor+operated+by+energy+harvesting+from+a+single+Wiegand+pulse&author=Takemura,+Y.&author=Fujiyama,+N.&author=Takebuchi,+A.&author=Yamada,+T.&publication_year=2017&journal=IEEE+Trans.+Magn.&volume=53&pages=4002706&doi=10.1109/TMAG.2017.2713837|website=scholar.google.com|doi=10.1109/tmag.2017.2713837| hdl=10131/00012485 | s2cid=44644693 |access-date=2020-05-12|hdl-access=free}}

Typical applications fall into three main categories; pulse generation applications, power transmission applications and combined sensing and energy harvesting applications.

As a reliable source of consistently timed pulses, Wiegand sensors are used in industrial and commercial flow-metering applications (e.g. water and gas), and also to calculate rotation speed in tachometers (e.g. high-speed trains).

By placing the Wiegand sensor within an oscillating electro-magnetic fields (e.g. from a Helmholtz coil), Wiegand sensors can be used to provide energy for low power applications in environments where high frequency transmission is challenging (e.g. transcutaneous power for medical devices).{{Cite web|title=Circuit Parameters of a Receiver Coil Using a Wiegand Sensor for Wireless Power Transmission|url=https://www.researchgate.net/publication/333820360|last=|first=|date=|website=|archive-url=|archive-date=|access-date=}}

Wiegand sensors are commonly used in ‘Batteryless’ rotary encoder technology for self-powered revolution counting. Harnessing both the timing of the pulses and the pulse energy, such rotary encoders provide reliable multiturn counting even in the absence of external power or batteries.{{Cite web|title=WHITE PAPER: Energy Harvesting with the Wiegand Effect|url=https://www.posital.com/media/posital_media/documents/flyer_wiegand_sensor/WiegandTech_WHITEPAPER_2018_002.pdf|last=|first=|date=|website=POSITAL|archive-url=|archive-date=|access-date=}}

{{reflist}}

Category:Magnetic devices