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Industrial Battery Charger by Thyristor Firing Angle Control
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PROJECT DESCRIPTION

The project is designed for charging batteries by DC from AC power supply. DC power for a battery charger is derived from a thyristor controlled rectifier system. AC power is applied to a bridge rectifier comprising of diodes and a triac getting desired control from microcontroller.

The project uses zero crossing point of the waveform which is detected by a comparator whose output is then fed to the microcontroller. The microcontroller provides required delayed triggering control to a triac through opto isolator interface.

Finally the power is applied to the load through the triac in series with the bridge rectifier. The rectified and controlled DC output is given to the load i.e., a resistor used in our project in place of a battery. The output DC voltage is measured using a multimeter.

This project uses a microcontroller from 8051 family which is interfaced through push button switches used for increasing or decreasing the DC voltage for proper charging purposes.

The project can be further enhanced by using direct 230 volt supply instead of 12 volt AC to the bridge rectifier for achieving higher voltage control for charging number of batteries in series.

PROJECT HIGHLIGHTS
Thyristor based Battery Charger
Extensive audio-visuals available.
Branding-free material.
Call/mail for Tech Support from 10 am-7 pm
Pre-programmed Microcontroller.
All-inclusive solution kit.
Easy to use, Self-explanatory kit.
BLOCK DIAGRAM
Hardware Requirements
  • 8051 series Microcontroller
  • Op-amp
  • Opto-Isolator
  • Triac
  • Voltage Regulator
  • Transformer
  • Diodes
  • Crystal
  • LED
  • Push Button
  • Resistors
  • Capacitor
  • Load
Software Requirements
  • Keil compiler
  • Language: Embedded C or Assembly
Q & A
Q:  Which microcontroller is used in this project?
A:  A 40 pin microcontroller from 8051 family is used in this project.
Q:  What is DC power control?
A:  DC power control is controlling the DC power applied to the load using a thyristor controlled bridge rectifier.
Q:  What is ZVS?
A:  ZVS is zero voltage sensing, used to detect the point on the time/frequency axis, when the AC voltage is zero. In other words, it generates a pulse for every zero crossing of the AC signal waveform.
Q:  What is the formula for calculating smoothing capacitor value?
A:  There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.
READ WHAT OTHERS HAVE SAID
Average Rating
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Showing 1 of 1 reviews
Nagesh A, on 7th November, 2012, 11:50 PM

I have completely satisfied with the working of the project and the given audio visuals. It was wonderful experience to me to do the project by watching the videos.

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