DC -to AC converters are known as
inverters. The function of an inverter is to change a DC input voltage
to a symmetrical AC output voltage of desired magnitude and frequency.
The output voltage could be fixed or variable at a fixed or variable
frequency as desired. An Inverter functions by converting the
Alternating current (AC) input to Direct current (DC) in the converter
charger circuit and reconverting to AC in the inverter circuit.
Batteries are connected in parallel to the input of the Inverter and
instantaneously come on when the AC supply fails. if there is a total
mains failure the system automatically switches to the back-up source
of power In case of power failure, a good inverter would switch to
battery for backup so fast that the time of switching is not to be
perceptible. As a result some appliances that required a higher start
current, like the refrigerator can be driven using Inverter. Square
Wave produce the humming sound and reduce the life of the appliances.
In most of the Transistor power inverter, output is the square wave on
battery mode. Inverter produces the stepped Sine Wave (Quasi Sine
Wave) which is nearly equivalent of the AC Main Sine wave and gives
the same results.
Battery is the life of the Inverter. An
Inverter lives on battery so it is the responsibility of the
Inverter to protect the battery and use it optimally and enhance
its life. Inverter battery lifetime is maximized if the battery is
always powered from a constant current charger. Inverter gives
constant charging current to batteries irrespective of the A. C
Voltage i.e. whether the AC Voltage is 150 or 270V, the battery
gets nearly the same charging current. This protects the battery
plates from damage.Inverter has an advanced trickle charging
mechanism built in the system to prevent batteries from
overcharging and to increase the battery life.