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PROJECT DESCRIPTION

This project is designed to engage a device to increase the life of the incandescent lamps. As in cold condition, the incandescent lamps exhibit very low resistance due to which they draw high current while switched on, resulting in failure.

The technique of zero voltage switching in modern power management is explored here. Several ZVS topologies and applications, limitations of the ZVS technique, and a generalized design procedure are featured.

Abruptly switching of lamps may switch the load at peak supply voltage. When such random switching occurs, as the lamp is in cold condition having low resistance,  then the current further shoots up (switching on at the time of peak supply voltage) leading to premature failure of the lamp. This can be avoided by engaging a TRIAC in such a way that the switch on time is precisely controlled by exactly firing it after detecting the zero cross-point of the waveform of supply voltage. A comparator is used for ZVS output – as ZVS is given as reference-interrupt to the microcontroller. A push button is implemented for switching on the lamp at zero voltage of the supply voltage so the lamp draws current gradually from the zero to full value.

The power supply consists of a step-down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to a DC using a Bridge rectifier. The ripples are removed using a capacitive filter, and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components.

In future, the project can be heightened by using three TRIACS, one in each phase for three phase load switching.

×

This project is designed to engage a device to increase the life of the incandescent lamps. As in cold condition, the incandescent lamps exhibit very low resistance due to which they draw high current while switched on, resulting in failure.

The technique of zero voltage switching in modern power management is explored here. Several ZVS topologies and applications, limitations of the ZVS technique, and a generalized design procedure are featured.

Abruptly switching of lamps may switch the load at peak supply voltage. When such random switching occurs, as the lamp is in cold condition having low resistance,  then the current further shoots up (switching on at the time of peak supply voltage) leading to premature failure of the lamp. This can be avoided by engaging a TRIAC in such a way that the switch on time is precisely controlled by exactly firing it after detecting the zero cross-point of the waveform of supply voltage. A comparator is used for ZVS output – as ZVS is given as reference-interrupt to the microcontroller. A push button is implemented for switching on the lamp at zero voltage of the supply voltage so the lamp draws current gradually from the zero to full value.

The power supply consists of a step-down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to a DC using a Bridge rectifier. The ripples are removed using a capacitive filter, and it is then regulated to +5V using a voltage regulator 7805 which is required for the operation of the microcontroller and other components.

In future, the project can be heightened by using three TRIACS, one in each phase for three phase load switching.

PROJECT HIGHLIGHTS
Load Switch @ Zero Voltage.
Call/mail for Tech Support from 10 am - 7 pm IST.
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
×
Load Switch @ Zero Voltage.
Call/mail for Tech Support from 10 am - 7 pm IST.
Easy to use, Self-explanatory kit.
All-inclusive solution kit.
Extensive audio-visuals available.
Branding-free material.
Pre-programmed Microcontroller.
BLOCK DIAGRAM
Hardware Requirements
  • 8051 series Microcontroller
  • OPAMP
  • Opto-Isolators
  • TRIAC
  • Transformer
  • Diodes
  • Voltage Regulator
  • Push Button
  • LED
  • Resistors
  • Capacitors
  • Crystal
  • Load
×
  • 8051 series Microcontroller
  • OPAMP
  • Opto-Isolators
  • TRIAC
  • Transformer
  • Diodes
  • Voltage Regulator
  • Push Button
  • LED
  • Resistors
  • Capacitors
  • Crystal
  • Load
Software Requirements
  • Keil compiler
  • Languages: Embedded C or Assembly
×
  • Keil compiler
  • Languages: 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:  How is the lamp life extended?
A:  The lamp is switched on at zero crossing point of supply voltage, drawing least power, thus extending its life.
Q:  How is the zero crossing point detected?
A:  Zero crossing point is detected using Operational amplifiers as comparators.
Q:  Which thyristor is used?
A:  TRIAC BT136 is used as the thyristor.
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