How Can Convert Single Phase Power Into Three Phase?


You may find there three options to convert the single phase power convert into three phase, such as-


  1. static converter- using capacitor to create a power waveform;
  2. rotary converter- using connect single-phase motor to three-phase generator; 
  3. electronic converter- using single-phase power converting into DC and then inverting into three-phase AC.


Converting Single Phase Power Into Three Phase: Using Digital Converter

Here in this article we will discuss and try to give very basic idea about converting the single phase power into three phase power in different practicable way. This is not the detail circuit diagram or shop design. This is the conceptual drawing that will help a beginner to start their project or enlarge their thinking about critical power supply.
Digital Phase Converter from Single Phase to Three Phase
Convert Single Phase Into Three Phase
 A digital phase converter actually creates a three phase from a single phase power  using a digital signal processor (DSP) or a electronic circuit what is used to control power electronic devices to generate a third phase of voltage.

This type of phase converter is much more balanced and stable system, so far using a two to three phase converter.


Principle of Digital Single to Three Phase Converter:

The digital phase converter actually convert the  AC power from the utility to DC, then back to AC. The power switching devices Insulated Gate Bipolar Transistors (IGBT) is uses to process.


"The Insulated Gate Bipolar Transistor also called an IGBT for short, is something of a cross between a conventional Bipolar Junction Transistor, (BJT) and a Field Effect Transistor, (MOSFET) making it ideal as a semiconductor switching device".

In converter circuit, IGBTs in series with inductors are used in series with the input rectifier circuit where IGBTs are controlled by pre-programmed software in DSP to draw the sinusoidal current from the single-phase line charging capacitors on a constant DC voltage. Also the controlled rectifier input allows power factor correction.

The Power drawn from output of IGBTs are not sinusoidal AC voltage.
It is actually very high harmonic distorted  pulse-width modulated (PWM) waveform, when this passes through an inductor/capacitor filter circuit then output become conventional a sine wave voltage.


Converting Single Phase Power Into Three Phase: Using Three Phase Motor

It can make a Rotary Phase Converter using a three phase motor started up in Single Phase with the spare leg connected to Capacitors to cause a phase shift to make the motor start up and run.

Using the following connection procedure a single phase motor can drive a three phase generator, means it convert a single phase source into a three phase power source.


Advantages and Disadvantages of Different Converters 

Considering the above mentioned three types of converters we can conclude that static converters have lots of problems, and are generally a seriously inferior solution, but they are cheaper and do work in some situations. On the other way moderately but cleanest three-phase power generator is the rotary converters, but  they have moving parts. Finally the  electronic converters are also fairly expensive but have no moving parts.

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