Yusmarnita Yusop

Contactless energy transfer using acoustic approach - A review

A coupled of ultrasonic transducer can act as a power transmission device by means of Acoustic Energy Transfer (AET). This method is relatively new method of contactless energy transfer and could be an alternative to the currently established technologies for the contactless transmission of power, such as inductive power transfer (IPT) and capacitive coupled power transfer (CPT). This paper presents a review on energy transmission through ultrasonic transducers as a source of power that has been applied by various researchers. Through this review, we hope that a better understanding of AET concept can be established and therefore can have a bright future.

Real time mailbox alert system via SMS or email

Upon receiving new mails or letters in their mailbox, most users do not get notified of this fact. They have to speculatively and periodically check their mailbox contents. In most events, the users are neglectful on checking their mailbox. This at times may lead towards the ignorance of important letters and results in various miseries. Most of the multi story buildings such as apartments, condominiums, office buildings etc limit the users on limited visits to check or collect their letters due to the centralize mailbox location. Users find convenient to be on alert of mails they receive to overwrite the conventional method of checking mailbox. Because of the high confidentiality and official letters are increasing as a corresponding tool globally, the users seek for a better solution which enables them to be on their toes each time a mail is delivered. The state of the art electronics technology is incorporated into these conventional mailboxes as a solution. The programmable logic controller, interface module and the GSM modem can be incorporated by linking the userpsilas mailbox with short messaging system or email facilities and this enables the users to be notified whenever a new mail is delivered. Mails delivered into the users mailbox, the system will automatically generate an alert which is send in the form of a short message system or email that typically details the real time of mail delivery. The system is designed to easy human life by sending short messaging system or email to notify the users about important new mails reaching their mailbox. This is likely to be a fast growing and popular application for short messaging system and email towards the mankind.

Design of Capacitive Power Transfer Using a Class-E Resonant Inverter

This paper presents a capacitive power transfer (CPT) system using a Class-E resonant inverter. A Class-E resonant inverter is chosen because of its ability to perform DC-to-AC inversion efficiently while significantly reducing switching losses. The proposed CPT system consists of an efficient Class-E resonant inverter and capacitive coupling formed by two flat rectangular transmitter and receiver plates. To understand CPT behavior, we study the effects of various coupling distances on output power performance. The proposed design is verified through lab experiments with a nominal operating frequency of 1 ㎒ and 0.25 ㎜ coupling gap. An efficiency of 96.3% is achieved. A simple frequency tracking unit is also proposed to tune the operating frequency in response to changes in the coupling gap. With this resonant frequency tracking unit, the efficiency of the proposed CPT system can be maintained within 96.3%–91% for the coupling gap range of 0.25–2 ㎜.

Real time shop floor monitoring system for a better production line management

Efficiency and accuracy at the production lines enables a better production and utilization of the available resources. The data available should be interpreted accurately in order to identify the various faults at production level and to immediately rectify them to improve efficiency. An accurate data management and shop floor monitoring system (PMS) is equally important in improving production performance. A number of production floors are utilizing manual methods of data collection for producing reports. Manual data compilation leaves room for both inconsistencies and inaccuracies. When manual data collection is practiced, there is usually a second step of manually compiling the data. This is most commonly accomplished by entering in the information into spreadsheets. When the data is collected without the help of a PMS then the data can be inaccurate. Where there is human intervention on the recording or collection of data, the truthfulness of the collected data is no longer reliable. This paper presents an automated data collection and display system for production lines. Once the data is displayed, it is transferred into computerize spreadsheet in the remote office by authorized personnel for reporting purposes. The system will generate an automated report which stays in place and the management only needs to act base on the results. This cost effective automatic data collection is the alternative to manual data collection. It significantly improves the accuracy of the valuable reports for management.

Capacitive power transfer with impedance matching network

This paper presents the development of a new wireless power transfer technique using capacitive coupling. Capacitive power transfer (CPT) system has been introduced as an attractive alternative to the traditional inductive coupling method. This is due to the CPT benefits of simple topology, fewer components, better EMI performance and robustness to surrounding metallic elements. In this work, a Class-E resonant inverter together with impedance matching network has been utilized as a high frequency ac power source because of its ability to perform the dc-to-ac inversion efficiently. It helps the CPT system to achieve a maximum power transfer. The CPT system is designed and simulated by using Proteus 8 Professional software. The validity of the proposed concept has been verified by conducting a laboratory experimental CPT system. It generates a 9.5W output power through a combined interface (PCB plate) capacitance of 2.82nF, at an operating frequency of 1MHz, with 95.44% efficiency. Also, the proposed CPT system with impedance matching network allow variation to the load while maintaining the efficiency over 80%.

Performance assessment of class-E inverter for capacitive power transfer system

Purpose This paper aims to present a new wireless power transfer technique using capacitive coupling. The capacitive power transfer (CPT) system has been introduced as an attractive alternative to the traditional inductive coupling method. The CPT offers benefits such as simple topology, fewer components, better electromagnetic interference (EMI) performance and robustness to surrounding metallic elements. Design/methodology/approach A class-E inverter together with and without inductor capacitor (LC) matching circuit has been utilised in this work because of its ability to perform the DC-to-AC inversion efficiently with significant reduction in switching losses. The validity of the proposed concept has been verified by conducting a laboratory experiment of the CPT system. Findings The performances for both systems are analysed and evaluated. A 9.7 W output power is generated through a combined interface [printed circuit board (PCB) plate] capacitance of 2.82 nF at an operating frequency of 1 MHz, with 97 per cent efficiency for 0.25 mm coupling gap distance. Originality value An efficient CPT system with class-E LC matching topology is proposed in this paper. With this topology, the zero-voltage switching can be achieved even if the load is different by properly designing the LC matching transformation circuit.

Development of 416kHz PZT driver for acoustics energy transfer applications

The power transfer efficiency and power transfer capability are the most crucial performance indicator in acoustic energy transfer (AET) applications. As overall efficiency is dependent on the power conditioning at the transmitter and receiver side, it is required to develop a high efficiency power amplifier on the transmitter side in addition with a high efficiency power processor at the receiving end. This paper developed the complete PZT driver with π1a matching impedance circuit that applied to the transmitter unit of the AET system in order to transmit 80mW power on the operating frequency of 416kHz. The Proteus Software used as a simulation platform with peripheral interface controller (PIC16F877A) as pulse width modulation signal generator for MOSFET IRF510 gate in the circuit. As the promising result, the developed transmitter unit shown 73.68mW at 416kHz with 92.1% power conversion efficiency.

Class-E LCCL for capacitive power transfer system

This paper presented the design of a capacitive power transfer (CPT) system by implementing a Class-E inverter due to its high efficiency, which in theory can reach close to 100% performance. However, the Class-E inverter is highly sensitive to its circuit parameters under the scenario of having small capacitance at the coupling plate. As a solution, an additional capacitor can be integrated into the Class-E inverter for increased coupling capacitance for a better performance. Both simulation and experimental investigations were carried out to verify the high efficiency CPT system based on Class-E inverter with additional capacitor. The outcome of the investigation exhibited 96% of overall DC-DC power transfer efficiency with 0.97 W output at 1MHz operating frequency.