Mr. Jiahua Wang Profile

Jiahua Wang

at Chinese Univ of Hong Kong

SPIE Involvement:

Author

Publications (2)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 21 March 2019 Paper

A bidirectional energy conversion circuit for piezoelectric energy harvesting and vibration exciting purposes

Bao Zhao, Jiahua Wang, Junrui Liang, Wei-Hsin Liao

Proceedings Volume 10967, 109670J (2019) https://doi.org/10.1117/12.2515217

KEYWORDS: Energy harvesting, Complex systems, Switches, Transducers, Electromechanical design, Capacitors, Interfaces, Oscillators, Piezoelectric effects, Sensors

Read Abstract +

Piezoelectric transducers can convert the mechanical energy into electrical one with their direct piezoelectric effect, or reciprocally convert the electrical energy into mechanical one with their inverse piezoelectric effect. Various applications were developed based on either of these two effects, for example, sensors and energy harvesters using the direct piezoelectric effect and actuators using the inverse piezoelectric effect. Yet, few of them have fulfilled the multi-functional purposes, which are useful in some application scenarios. This paper proposes a bidirectional energy conversion circuit (BECC) solution for the time-division energy harvesting and actuating purposes. The circuit topology is derived from the synchronized triple bias-flip circuit, which was formerly used for energy harvesting enhancement. The circuit topology and control logic for energy harvesting and actuating modes are discussed in details. Two designs are studied for investigating the potential applications of the BECC. In the linear piezoelectric structure, the BECC can be used to provide vibration excitation and then reclaim the vibration energy. Such time-division energy injection and reclamation can be used in some non-destructive structural health evaluations. The proposed BECC can be also used to realize the controllable orbit exciter in nonlinear piezoelectric energy harvesting systems. It is the first time to realize a compact and integrated orbit exciter and energy harvester by using a single interface circuit. Simulations and experiments are carried out for validating the performance of the BECC towards versatile engineering designs.

Proceedings Article | 16 March 2018 Paper

Triggering the high-energy orbit oscillation of bistable energy harvesters using electrical coupling

Jiahua Wang, Wei-Hsin Liao

Proceedings Volume 10595, 105950S (2018) https://doi.org/10.1117/12.2296747

KEYWORDS: Electromagnetism, Switches

Read Abstract +

As a nonlinear system, bistable energy harvester produces large amplitude vibration and high energy output since it allows the system transit from one stable state to the other. However, it is challenging to activate the high-energy orbit oscillation in ambient environments, where vibration level would be low. This paper proposes a method that an electrical coupling between an electromagnetic energy harvester and a piezoelectric energy harvester is used to help the hybrid system overcome the potential well barrier and maintain in the high-energy orbit. A control switch is employed to electrically connect or disconnect the two energy harvesters. The interaction between them will bring the system from low-energy orbit to high-energy orbit. Benefited from nonlinear features with the coupling, both energy harvesters will stay on the high-energy orbit after the coupling action. Harmonic balance method is employed to demonstrate the multi-solution characteristics of the bistable energy harvester. Furthermore, a coupled model based on Hamilton’s principle and Kirchhoff’s circuit laws is developed to reveal the jumping phenomenon. Simulation results show that high-energy orbit is achieved and maintained after the coupling. Our proposed solution requires no complex structure design or external power source, so as to provide a feasible and reliable solution to address the critical issue of bistable energy harvesters in practical applications.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years