LED Light Bulb

LED light bulb

Objective:

Our objective was to design a LED (light emitting diode) light bulb which is cheaper than that of available at market.

Group Members:

M. Rameez Shujat

Haseeb Sarwer

Zain Taufique

Proteus Design:

Note: The led connected are just to show the load.

Here we can see the voltages across the input side and at the output side.

In this graph: green is showing input ac, red is showing output through the transformer, blue is showing constant dc voltage and yellow is ground.

Components Used:

Followings are the list of components used in circuit:

Centre-tap Transformer

12V LED Light

1n4007 Diodes

2200uF, 100nF and 470uF Capacitor

7812 Voltage Regulator

Vero Board

Price Of Circuit:

Whole price of the circuit is Rs 170.

Process:

Following are the process involved in the design:

1. Step-down voltage: To step-down 220V AC to save 12-16 V AC using centre-tap transformer.

2. Rectification : To convert AC to DC using four diode bridge rectification method.

3. Smoothing dc level: To provide near constant DC value for our load using appropriate capacitors.

Practical Implementation:

Circuit Analysis:

AC Input Analysis:

Voltage (V) 231 VCurrent (I) 0.31A

Real Power (W) 6.45WReactive Power (VAR) 2.60VARApparent Power (VA) 7.17VA

Intensity(Lux) 75.6

Harmonic Distortions:

% Voltage Distortion 0.91%% Current Distortion 27.13%

DC Power Output:

Voltage (V) 15.6VCurrent (I) 0.28APower(W) 4.37W