US 12,107,518 B2
Environmental energy harvesting device
Takeaki Yajima, Tokyo (JP); Hiroshi Toshiyoshi, Tokyo (JP); Hiroaki Honma, Tokyo (JP); Yukiya Tohyama, Tokyo (JP); and Hiroyuki Mitsuya, Sayama (JP)
Assigned to The University of Tokyo, Tokyo (JP); and Saginomiya Seisakusho, Inc., Tokyo (JP)
Appl. No. 17/621,398
Filed by The University of Tokyo, Tokyo (JP); and Saginomiya Seisakusho, Inc., Tokyo (JP)
PCT Filed Jun. 19, 2020, PCT No. PCT/JP2020/024252
§ 371(c)(1), (2) Date Dec. 21, 2021,
PCT Pub. No. WO2020/262263, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-116310 (JP), filed on Jun. 24, 2019.
Prior Publication US 2022/0360199 A1, Nov. 10, 2022
Int. Cl. H02N 11/00 (2006.01); G05F 1/56 (2006.01)
CPC H02N 11/002 (2013.01) [G05F 1/561 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An environmental energy harvesting device comprising:
an energy converting element that converts environmental energy into electric energy;
an environmental sensor that is disposed in an identical environment as the energy converting element; and
a power supply circuit that receives electricity generated by the energy converting element and outputs the electricity to an external load, the power supply circuit includes a voltage limiting circuit that limits an alternating-current signal output by the environmental sensor to a voltage within a predetermined range, the voltage limiting circuit includes a dynamic comparator that receives the alternating-current signal output by the environment sensor and a memory circuit that stores an output of the dynamic comparator,
wherein the power supply circuit changes an operation condition in accordance with an output of the environmental sensor.