All-in-One High-Power-Density Vibrational Energy Harvester with Impact-Induced Frequency Broadening Mechanisms

Abstract

This paper proposes an electrostatic-piezoelectric-electromagnetic hybrid vibrational power generator with different frequency broadening schemes. Both the nonlinear frequency broadening mechanisms and the synergized effect of the electrostatic-piezoelectric-electromagnetic hybrid structures are investigated. The structure and performance of the composite generator are optimized to improve the response bandwidth and performance. We propose that the electrostatic power generation module and the electromagnetic power generation module be introduced into the cantilever beam to make the multifunctional cantilever beam, realizing small integrated output loss, high output voltage, and high current characteristics. When the external load of the electrostatic power generation module is 10 kΩ, its peak power can reach 3.6 mW; when the external load of the piezoelectric power generation module is 2 kΩ, its peak power is 2.2 mW; and when the external load of the electromagnetic power generation module is 170 Ω, its peak power is 0.735 mW. This means that under the same space utilization, the performance is improved by 90%. Moreover, an energy management circuit (ECM) at the rear end of the device is added, through the energy conditioning circuit, the device can directly export a 3.3 V DC voltage to supply power to most of the sensing equipment. In this paper, the hybrid generator’s structure and performance are optimized, and the response bandwidth and performance are improved. In general, the primary advantages of the device in this paper are its larger bandwidth and enhanced performance.

Mechanical Intelligent Energy Harvesting: From Methodology to Applications

“…It can not only be used as a mechanical intelligent structure alone, but also combined with bistable and multistable systems to regulate the dynamic characteristics of the system and harvest more mechanical energy in the effective range. [ 266–269 ] Zhao et al. [ 125,270 ] proposed a rotating bistable system with physical boundaries symmetrically fixed on both sides of the cantilever beam as shown in Figure 11F.…”

“…It can not only be used as a mechanical intelligent structure alone, but also combined with bistable and multistable systems to regulate the dynamic characteristics of the system and harvest more mechanical energy in the effective range. [266][267][268][269] Zhao et al [125,270] proposed a rotating bistable system with physical boundaries symmetrically fixed on both sides of the cantilever beam as shown in Figure 11F. Due to the high stiffness of the boundary, the elastic potential energy of the system will increase sharply with contact deformation as the cantilever beam collides with the boundary.…”

Editorial for the Special Issue on Smart Devices and Systems for Vibration Sensing and Energy Harvesting

“…This Special Issue focuses on state-of-the-art vibration sensing and energy harvesting technologies. After being carefully reviewed, 11 articles have been accepted for publication in this Special Issue [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ] that can be divided into three aspects: (i) new materials for vibration energy harvesting applications, (ii) design and fabrication of vibration energy harvesters (VEHs), and (iii) system-level integration and testing of VEHs.…”

“…Cao et al proposed an electrostatic‒piezoelectric‒electromagnetic hybrid vibrational power generator. By designing the energy management circuit at the rear end of the device, the packaged device can directly export a 3.3 VDC voltage to supply power to most of the sensing equipment [ 14 ]. A novel hydraulic interconnected regenerative suspension was reported by Guo et al [ 15 ].…”