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State-of-charge estimation is vital to maximize battery performance and ensuring safe operation. The accuracy of a state-of-charge estimation technique is greatly influenced by the accuracy of the applied battery model. However, the battery model's parameters are varying with several factors, such as temperature, charge/discharge rate, usage cycle, and age. Therefore, an online battery modeling approach...
This paper presents a bridgeless SEPIC topology with Power Factor Correction (PFC) to charge electric vehicle battery. The converter offers a few advantages such as reduce total component count and reduction of conduction loss during the conversion AC to DC, hence higher overall system efficiency. The PFC converter operated under continuous conduction mode (CCM) with average current mode control strategy...
Lithium titanate oxide is considered as the most promising anode material for lithium-ion battery owing to its fast charging capability. Its charging profile is essential to be modeled with a simple battery model for battery charger design. This paper develops a universal mathematical battery model which can be fitted to the charging profiles of different charging rates by using genetic algorithm...
This paper presents a comparative study on low noise precision difet operational amplifier, OPA111 and low noise operational amplifier, OP27 for potentiometric transduction circuit. Methods for integration of piezoresistive MEMS sensor with the potentiometric transduction circuit have reported successes. There was a need for a low noise operational amplifier for amplifying the output from the piezoresistive...
Printed circuit board (PCB), assembly process is developing in a rapid pace. These PCBs are utilized in a heavily in the electronic manufacturing industry. During assembly process, the PCB plates are subjected to mechanical loads such as bending which induces stress distribution on the PCB plates. In this paper, a study on the printed circuit board (PCB) plates during bending process was done. Ansys...
Lithium Ferro Phosphates (LiFePO4) batteries have high potential to be widely employed in the future due to its stability on chemical and thermal characteristics. Therefore, an accurate battery model of high capacity LiFePO4 battery is important for a circuit designer to handle and optimize battery usage. However, nonlinear capacity effects of the battery are usually not been considered. The ignorance...
This paper discusses the Lithium Ion battery modeling by using equivalent circuit model with nonlinear transfer resistance. The modeling is done by using MATLAB/Simulink. A constant current pulse test is used to extract the model's parameters and the procedures are presented in details. Then the voltage responses of the conventional model, proposed model and MATLAB Li-ion cell model are compared....
Starting a free-piston linear engine-generator (LG) requires favorable compression pressure and piston speed for combustion to occur. To produce the required reciprocating motion, the LG is operated as a brushless linear motor. However, the peak force required to achieve the full stroke is beyond the maximum motor force that can be produced, limited by the coils' current capacity and LG's motor constant...
This paper describes the circuit design and measurement of a single stage RF amplifier for 5.8 GHz-band with IEEE 802.11a standards for WLAN applications. The circuit was simulated using Ansoft Designer where a 14 dB of gain; input and output return loss less than -10 dB were observed. The GaAs hetrojunction FET (HFET), capacitors and resistors are combined with the microstrip line pattern by silver...
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