Tsair-Rong Chen

Development of a universal contactless charger for handheld devices

The purpose of this paper is to design and implement a universal contactless charger for handheld device by means of electromagnetic coupling induction related applications. Through coil coupling induction, contactless power transmission system is able to supply power to the secondary side with high safety and low repair rate features. However, this paper discusses PCB (Printed Circuit Board) and a spiral-type induction coil used as a coupling induction device for the contactless charging system. With the design proposed in this paper, the size of regular counting induction devices can be greatly reduced. By changing the geometric shape and location of coupling coil, the relationship and changing conditions of respective parameters and coupling coefficients can be obtained and analyzed to serve as references for future designs. Therefore, in conjunction with theoretic and actual design guidelines, sequential studies will be conducted. Finally, contactless mobile phone charger with rated 4.2V, 800 mA is completed to validate its function.

Model of contactless power transfer system for linear track

This paper proposed a model of Contactless Power Transfer System(CPTS), which adopted a transformer with big air-gap and long primary wires. The system has the characters of long leakage inductance, small magnetizing inductance and low coupling coefficient. It makes the transmission efficiency very low, this model improved system efficiency by adopting resonance of compensation capacitance and leakage inductance in transfering energy to the load. The Maxwell/IsSpice simulation is applied to verify the feasibility. A contactless power transfer system for linear track is confirmed. The experimental evidence reported 0.21 Ω primary coil impedance and 7 A primary current. The transferring efficiency of CPTS can reach 76%.

Study of applying contactless power transmission system to battery charge

Contactless power transmission system with the advantages of safety and convenience has been applied to daily supplies. However, general contactless power transmission charger cannot control the current cause there is no charge controller in secondary side and the severe limitation between primary and secondary sides of the battery charger cause difficulty to design. This study provides the charge controller with half-bridge inverter and E-Type core as coupling converter in primary side; A Zeta DC converter is utilized to achieve the outcome of charge with constant voltage and to increase the charging distance between primary and secondary sides. To verify the feasibility of contactless power transmission system, the study completes the contactless charger with the output power of 30W. The result shows that the overall system efficiency is 57.8 % with 150 V/ 0.35A input and 15.2 V/2 A output.

Study of a contactless power transmission system

This paper discusses the contactless power transmission system. The magnetic coupling model and structure required by contactless power transforming system with high efficiency are set up according to the analysis results. Then, advantages and disadvantages of various power converter models are investigated with circuits of compensation and efficiency promotion to design the best main circuit structure of converter. However, by simulation experimental results, the contactless transmission system is confirmed with high safety and efficiency. Finally, the contactless power transmission system with output voltage of 31V and output current of 11A is confirmed.

Performance of an Energy Efficient Routing Scheme for Cluster-based Wireless Sensor Networks

This paper proposes a novel energy efficient data clustering scheme to improve energy efficiency for cluster-based wireless sensor networks (WSNs). In order to reduce the energy dissipation of transmitting sensing data at each sensor, the fixed clustering algorithm uniformly divides the sensing area into clusters where the cluster head is deployed to the centered of the cluster area. Moreover, to perform energy efficient grid clustering (EEGC), the nodes take turns to be cluster head. Simulation results show that proposed EEGC definitely reduces the energy consumption of the sensors and prolongs network lifetime to be longer than LEACH for both life rate=50% and 70% . Moreover, the total transmission data of EEGC is more 60% than LEACH scheme.

Study of contactless power supply for wireless mouse

This paper discuses the printed circuit board (PCB) winding of the contactless power transmission system comparing the traditional transformer power transmission system. In this study, the contactless power transmission system is successfully applied to the wireless mouse for stable power supply. To examine the feasibility of the proposed system in this paper, a contactless power transmission system is developed with 10 W of contactless coupling transformer in primary input power and 0.2 W of secondary output power, which are about 2% efficiency. However, the design of contactless power supply for wireless mouse can be used under the mouse pad to decrease battery consumption and reach the purpose of energy saving, carbon reduction, and environmental protection.

Application of Universal Contactless Charger for Cellular Phone

This paper discusses the designation and implementation of a universal contactless charger for a Cellular phone. By using the electromagnetic coupling induction with the related applications, the charger can be done. Through the coil coupling induction, contactless power transmission system can supply the power to the secondary side with higher safet rate and lower repair probability. However, the application discuused in this paper is the PCB (Printed Circuit Board) and a spiral-type induction coil used as a coupling induction device for the contactless charging system. With the design scheme in this paper, the size of regular counting induction devices can be greatly reduced. By changing the geometric shape and location of coupling coil, the relationship and changing conditions of respective parameters and coupling coefficients can be obtained and analyzed to serve as references for future designs. Therefore, in conjunction with theoretic and actual design guidelines, sequential studies will be conducted. Finally, contactless Cellular phone charger with rated 4.2V, 800 mA is completed to validate its function.

Battery Management for a Contactless Charger

This paper designs a contactless charger using the two-way battery charging that is the constant voltage (CV) and the constant current (CC). The charger system in this paper includes a microprocessor to manage the charge and discharge of the charger and predict the battery volume and low-battery warning. This system prevents the battery from over-charge and over-discharge. damage. The primary side of the transformer has maximum output is about 290W and the secondary side of the transformer is able to induct 124W at 1 cm coupling distance through air gap radiation. The maximum current is over 5.5A and the efficient transmission rate is over 41%.

The Battery Management for Power Supply System

The battery management system for the micro air vehicle discussed in this paper provides the better efficient control for evaluation of power system. This paper uses the management strategy to avoid the lose caused by micro air vehicle collapse and resulted from error in current capacity control. In order to avoid failure of flight mission, calculation and accurate the control of current, the micro air vehicle can be provided with longer flight range, sufficient usage of battery and appropriate feedback of system operation status. Operator then can be provided with all kinds of information in more clear status. A system in the micro air vehicle has to achieve the goal such as lower noise, longer-range flight, quicker response and accuracy. Moreover, this paper discusses the combination requirement and utilizes the power supply and micro components of transmit system available in the market to carry out optimal combination. We use the battery, motor, propeller, transmitter, receiver, and electrical transmission to carry out the better combination for the power supply system of UAV (Unmanned Aerial Vehicle).

Study of battery management applied to power system evaluation and test

All systems of micro air vehicle with strict limitation of weight and size must accomplish the mission in the conditions of low noise, long-range flight, and fast response. The requirement for accuracy is pretty restricted. This study explores the combination fulfilling the requirement, and utilizes power supply and micro components of transmit system available in the market to carry out optimal combination. We planned to select battery, motor, propeller, transmitter, receiver, and electrical transmission to carry out optimal combination to be used as power supply system of UAV (unmanned aerial vehicle).