Dc Power Supply
Abstract : A DC power supply is very important in our day to day life. We use it to charge or operate our DC components like charger light, cell phone battery charger etc. It’s nothing but a AC to DC converter.
Keywords: 5V DC power supply, rectifier, diode, filter, capacitor, zener diode, voltage regulator, signal, waveshape. 1. Introduction
I’m designing a 5V DC power supply. Here I’m basically designing a AC to DC converter. To convert the AC to DC, I’m using components like full wave bridge rectifier, filter & a voltage regulator. To get the constant 5V I use 1N4733A zener diode. The block diagram of this project is given below and giving the part to part wise explanation to latter section.
(a)
Basically I use 220 V AC signal of frequency 50Hz. To protect the components from damage because of over voltage I use a step down transformer in my model, which gives 12V (practically measured 13.6V) & 600mA current in the secondary windings.
In my report I discussed about the rectifier ,filter and the voltage regulator. 2. Rectifier
Although in our daily life we use A.C. current devices. But rectifier is a ‘Electronic device which converts A.C. power into D.C. power’.The study of the junction diode characteristics reveals that the junction diode offers a low resistance path, when forward biased, and a high resistance path, when reverse biased. This feature of the junction diode enables it to be used as a rectifier. The alternating signals provides opposite kind of biased voltage at the junction after each half-cycle. If the junction is forward biased in the first half-cycle, its gets reverse biased in the second half. It results in the flow of forward current in one direction only and thus the signal gets rectified.
The half-wave rectifier chopped off half our signal. A full-wave rectifier does more clever trick: it flips the - half of the signal up into the + range. When used in a power supply, the full-wave rectifier allows us to
Keywords: 5V DC power supply, rectifier, diode, filter, capacitor, zener diode, voltage regulator, signal, waveshape. 1. Introduction
I’m designing a 5V DC power supply. Here I’m basically designing a AC to DC converter. To convert the AC to DC, I’m using components like full wave bridge rectifier, filter & a voltage regulator. To get the constant 5V I use 1N4733A zener diode. The block diagram of this project is given below and giving the part to part wise explanation to latter section.
(a)
Basically I use 220 V AC signal of frequency 50Hz. To protect the components from damage because of over voltage I use a step down transformer in my model, which gives 12V (practically measured 13.6V) & 600mA current in the secondary windings.
In my report I discussed about the rectifier ,filter and the voltage regulator. 2. Rectifier
Although in our daily life we use A.C. current devices. But rectifier is a ‘Electronic device which converts A.C. power into D.C. power’.The study of the junction diode characteristics reveals that the junction diode offers a low resistance path, when forward biased, and a high resistance path, when reverse biased. This feature of the junction diode enables it to be used as a rectifier. The alternating signals provides opposite kind of biased voltage at the junction after each half-cycle. If the junction is forward biased in the first half-cycle, its gets reverse biased in the second half. It results in the flow of forward current in one direction only and thus the signal gets rectified.
The half-wave rectifier chopped off half our signal. A full-wave rectifier does more clever trick: it flips the - half of the signal up into the + range. When used in a power supply, the full-wave rectifier allows us to