US 11,837,977 B2
Self-resonance tuning piezoelectric energy with broadband frequency
Hyun-Cheol Song, Seoul (KR); Chong Yun Kang, Seoul (KR); Jin Sang Kim, Seoul (KR); Ji-Won Choi, Seoul (KR); Seung Hyub Baek, Seoul (KR); and Seong Keun Kim, Seoul (KR)
Assigned to KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed by KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY, Seoul (KR)
Filed on Nov. 20, 2020, as Appl. No. 16/953,859.
Claims priority of application No. 10-2020-0050765 (KR), filed on Apr. 27, 2020.
Prior Publication US 2021/0336561 A1, Oct. 28, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H02N 2/18 (2006.01); H10N 30/30 (2023.01); H10N 30/857 (2023.01)
CPC H02N 2/188 (2013.01) [H10N 30/304 (2023.02); H10N 30/857 (2023.02)] 9 Claims
OG exemplary drawing
 
1. A self-resonance tuning piezoelectric energy harvester with broadband frequency, the harvester comprising:
a piezoelectric beam which is extended along a horizontal direction;
a fixing member which fixes opposite ends of the piezoelectric beam; and
a mobile mass which the piezoelectric beam passes through, and which is capable of self-movement along the piezoelectric beam through a through-hole which has a free space in addition to a space which the piezoelectric beam passes through,
wherein as the mobile mass moves to a position of the piezoelectric beam, generated displacement of the piezoelectric beam is increased, and as the generated displacement becomes greater than the free space, the mobile mass is fixed to the position of the piezoelectric beam at which resonance will occur.