M. Fitra

Solar wireless power transfer using inductive coupling for mobile phone charger

A wireless power transfer (WPT) using inductive coupling for mobile phone charger is studied. The project is offer to study and fabricate solar WPT using inductive coupling for mobile phone charger that will give more information about distance is effect for WPT performance and WPT is not much influenced by the presence of hands, books and types of plastics. The components used to build wireless power transfer can be divided into 3 parts components, the transceiver for power transmission, the inductive coils in this case as the antenna, receiver and the rectifier which act convert AC to DC. Experiments have been conducted and the wireless power transfer using inductive coupling is suitable to be implemented for mobile phone charger.

Harmonics Performances of Single Phase Transformer due to DC Bias

The investigation of the direct current (dc) bias effect on single phase power transformer through their harmonics performance is present in this paper. The experimental study is done by the dc bias current injected simultaneously with alternating current (ac) source to primary winding of transformer. The input ac voltage to primary winding is maintained constant during investigation and the dc currents increased gradually. Compare to pure ac power applied, the results show that the waveforms distorted when the dc bias exist. The pulsated waveforms are pushed to half cycle in which the bias current is in the same direction as magnetizing current (unsymmetrical pulsated) and even harmonics are significant.

Fabrication of Organic Dye Sensitized Solar Cell

Renewable energy is rapidly gaining importance as an energy resource to help aid the national energy depletion crisis of fossil fuel and coal. One of the most potential renewable energy sources in Malaysia is hydropower followed by solar energy. This paper presents the fabrication of Dye Sensitized Solar Cell (DSSC) using organic dyes from dragon fruit and chlorophyll which is extracted from spinach. The fabrication of DSSC uses the Dr.blade method. Result shows that the efficiency by using dragon fruit as sensitizer at 40µm TiO2 Thickness is 6.45%, better than the usage of chlorophyll dye which is 4.23% at the same thickness. Result also shows that at 80µm by using the dyes from chlorophyll extract has higher solar cell efficiency compare to dragon fruit. This shows that both the chlorophyll extract and dragon fruit shows potential in the development of a feasible working organic dye.

Power capacity enhancement of transformerless photovoltaic inverter

A conventional inverter uses a transformer. Some transformers connected in parallel are needed to obtain a high power inverter. They cause the inverter has a big in size, expensive cost and low efficiency. To solve the problem, a transformerless photovoltaic inverter (TPVI) is suitable to be applied. This paper proposes a paralleled full bridge circuit (FBI) to enhance the power capacity of three-level transformerless photovoltaic inverter. It has a pulse driver circuit, five full bridge inverter circuits and a power factor correction (PFC) circuit. To obtain the high power capacity of the TPVI, five FBI circuits are connected in parallel. Each FBI circuit uses MOSFET IRFP460 which has rating current of 20 A, therefore the total FBI circuit has applicable maximum current of 100 A. Its main energy source is a photovoltaic (PV) array that consists of three unit PV modules connected in series, each unit has voltage of 81 V and power of 60 W. Some three unit PV modules are connected in parallel to fulfill the demand of high alternating current (AC) power. In this research, the AC three-level waveform of the TPVI is developed using a PIC microcontroller.

Performance Improvement of Dye Sensitized Solar Cell by Using Recycle Material for Counter Electrode

This project is to investigate the counter electrode material from two different carbon sources to fabricate dye sensitized solar cell (DSSC). The carbon sources are extracted from battery and pencil lead. The method to prepare the DSSC is through the conventional Dr.Blading method. The same method is also used for the counter electrode which uses carbon from recycle batteries, the carbon from pencil lead are scribbled onto the ITO glass to get a uniform coating. Both thickness of the counter electrode vary accordingly. The solar cells are then placed under outdoor solar irradiation and the output is taken every 10 minutes. Based on observation, the solar cells which have the carbon from batteries shows higher cell efficiency which is 8.2 % with lower FF of 0.78, compared to by using the pencil lead, the cell efficiency is only 7.23% but with a higher FF of 0.93.

A Small Scale Wireless Power Transfer

This paper describes a small scale energy transfer by using magnetic coil made with enamel coil, which is installed on the transceiver side and function generator and RF power amplifier are installed as source to generated signal, and on the receiving side is using an enamel coil materials as antenna. In this experiment obtained energy as it travels from the transceiver can be received at the receiver side without any media or cable, the principle of electromagnetic fields used in this experiment. Number of coil inductive coupling has been compare. Number of turn 4, efficiency 91 % at 0 cm with 4.55 volt and the lower efficiency 70% at 5 cm with 3.1 volt. And number of turn 8, efficiency 97.8% at 0 cm with 4.89 volt and the lower efficiency 70% at 5 cm with 3.50 volt

50 cm Air Gap Wireless Power Transfer by Magnetic Resonance Coupling

In this paper, we have developed transmitter, receiver and 2 structure magnetic resonant couplings. Both of the Transmitter and Receiver couplings are made of copper tubing. Transmitter and Receiver circuits were build by using Multisim software. Transmitter in put by DC source 12 Volt, 0.5 Ampere, with 50 cm Air gap wireless power transfer can reach efficiency 25.2 % with DC 3.02 Volt, 50.01 mA, at Frequency 164.76 kHz.

Performance Evaluation of Dye Sensitized Solar Cell for Varying TiO2 Thicknesses

A dye-sensitized solar cell with a dimension of 6 x 2 cm is fabricated with variation Titanium Dioxide, TiO2 thickness of 40 μm, 80 μm and 120 μm by smearing it on an Indium Tin Oxide, ITO coated glass. It was then tested under the average solar irradiance and temperature of 693.69 W/m2, 44.4 °C respectively. Based on investigation it was found that TiO2 of 40 μm produces an open voltage circuit of 0.21V, Short circuit current of 121.28 μA, and efficiency (η) of 9.78% while the 80 μm produces open voltage circuit of 0.16 V, short circuit current of 69.89μA and efficiency (η) of 2.66%, and TiO2 layer with thickness of 120 μm produces open voltage circuit of 0.00063 V short circuit current of 0 mA, efficiency (η) of 0%, and from these results, it shows that the best charge generation is from the thinner TiO2 thickness layer which is the 40 μm compare to other size.

Effect of TiO 2 thickness on dye sensitized solar cell performance

A dye solar cell with a dimension of 6 × 2 cm is fabricated with thickness of 40 μm, 80 μm and 120 μm of TiO₂ by smearing it on an ITO coated glass. It is then tested under the average solar irradiance and temperature of 693.69 w/m2, 44.4°C respectively. Based on experimental investigation it is found that TiO₂ of 40 μm produces V_oc = 0.21V, I_sc = 121.28 μA, Fill Factor (FF) = 1.1845, while the 80 μm produces V_oc = 0.16 V, I_sc = 69.89 μA, Fill Factor (FF) = 1.49 and TiO₂ layer with thickness of 120μm produces V_oc = 0.00063 V, I_sc = 0 mA, Fill Factor (FF) = 0. From these results it shows that the best charge generation is from the thinner TiO₂ thickness layer which is the 40um compare to with the other size.