As the popularity of utilizing the alternate sources of
power like wind and solar energy is constantly on the rise, it also has
increased the demand for the static inverter systems for the function of
changing DC energy stored in the batteries to standard AC form. Most of them
follow the same fundamental idea, that is a DC supply of moderately low voltage
and practically excellent stability is transformed by a oscillator having high and
step-up transformer. This DC current has the voltage with magnitude in
proportion to the maximum level of the required AC voltage. After this, a power
phase at the output produces the desired AC voltage from DC of higher voltage.
In general, there are two types of DC-AC inverters coming in
the market at present in addition to CFL UPS. One model is known as the “pure
sine-wave” inverter. These are excellent solution when there is a requirement
for clean, close- sine-wave power output for medical apparatus, industrial
equipments and various other critical applications.
The waveforms, near to the sine waves, with negligible alteration,
are necessary at any rate. These equipments come in a range of sizes up to many
thousand watts and are generally costly. The conventional methods adopted for creating
these models integrated considerable linear technology, decreasing their
efficiency and adding on to their cost.
Latest sine wave inverter designs put to use the pulse-width modulation (PWM) for feeding a pulsed
waveform that allows for significantly easy filtration to realize a close approximation
to a pure sine wave form. The good thing about PWM technique is that the switching
methods are employed in the power phase, which leads to considerably high
efficiency.
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