A non-contact mechanical solution for implementing synchronized switching techniques for energy harvesting using reed switches

Abstract

In this work we proposed a new mechanical method of implementing the synchronized switching technique for piezoelectric energy harvesting based on reed switches. Serving as a mechanical displacement monitor and the switch itself, it holds the merit of non-contact, persistence, and the low voltage threshold of merely a single PN junction. However, as all mechanical switches inherits chattering, or bouncing, energy loss and damping on the inversion was caused. To side pass the chattering, three types of electro-mechanical hybrid switches were furthermore developed to stabilize the interfered current flow: resistor-capacitor snubbers, inductor-capacitor snubbers, and silicon controlled rectifiers (SCRs). Each of the method has its merit and suitable working conditions. Comparing to conventional electrical switches, the proposed switches, greatly reduced the switch impedance since the mechanical switch part provides a physically open switch, and the electrical switch part merely consist of either a diode and a MOSFET pair, or a single SCR. Subsequently, the power loss due to the circuit was efficiently eliminated.

Development of modular backpack silage equipment control system

“…This seriously pollutes the environment and has great security risks. Therefore, active research and development of forage crop silage technology is the key to effective and reasonable utilization of forage crop [1].…”

“…This seriously pollutes the environment and has great security risks. Therefore, active research and development of forage crop silage technology is the key to effective and reasonable utilization of forage crop [1].The technical level of forage crop silage equipment in western countries is relatively advanced, the core technology is relatively mature, and high-density and large-scale are its key development direction. The 8000 series products developed by John Deere mainly include large self-propelled silage harvesters.…”

Comparative Case Study on the Self-Powered Synchronous Switching Harvesting Circuits With BJT or MOSFET Switches

“…A variety of approaches have been studied, including mechanical switches [18][19][20][21], velocity control [22], integrated circuits [23][24][25] or electronic breakers [26][27][28]. Among them, the mechanical switch relies on the structure's dynamic motion to connect and disconnect, and it has the advantage of simplicity and fewer electronic components requirements.…”

Compact self-powered synchronous energy extraction circuit design with enhanced performance

“…Various methods including mechanical switches [14][15][16][17], velocity control [18], integrated control circuits [19][20], electronic breakers [21][22][23][24][25] etc. have been developed.…”

“…have been developed. Among them, the mechanical switches approach has the fewest electronic components with the contacting electrodes [14][15][16] or the reed switch [17] instead of the electronic switches. However, it is not so adaptive to the displacement variations in many cases.…”