fault finding luminous inverter circuit
#1

What is the cause of bt displayo on the1.5kva luminous inverter?
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#2

It is rather futile discussing how to repair DC to AC inverter until one becomes fully informed regarding how does an inverter work. The following content walks you through both the aspects which can prove very useful to any electronic technician.

Stages of an Inverter

As the name suggests DC to AC inverter is an electronic device which is able to convert a DC potential normally derived from a lead-acid battery into a stepped-up AC potential which may be quite comparable to the voltage that is found in our domestic AC Mains outlets.


Repairing sophisticated inverters are not easy due to their many involved complex stages and requires expertise in the field. Inverters which provide sine wave outputs or the ones which use PWM technology to generate modified sine wave can be difficult to diagnose and troubleshoot for the folks who are relatively new to electronics.

However, simpler inverter designs that involve basic operating principles can be repaired even by a person who is not specifically an expert with electronics.


Before we move into the fault finding details it would be important to discuss how does an inverter work and the different stages normally an inverter may comprise:


An inverter normally may be divided into three important stages viz. oscillator, amplifier and the transformer output stage.


Oscillator: This stage is basically responsible for the generation of oscillating pulses either through an IC circuit or a transistorized circuit.

These oscillations are basically the productions of alternate battery positive and negative (ground) voltage peaks with a particular specified frequency (number of positive peaks per second.) Such oscillations are generally in the form of square pillars and are termed as square waves, and the inverters operating with such oscillators are called square wave inverters.


The above generated square wave pulses though are too weak and can never be utilized to drive high current output transformers. Therefore these pulses are fed to the next amplifier stage for the required task.
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