DC to AC converter
An AC load can be powered from a DC source by using a converter to change DC to AC. A typical DC-to-AC inverter energized from a 12-volt DC input signal uses a single stage inverter circuit to produce a quasi-sine wave output signal. In DC to AC converters a direct current voltage is applied to a so-called half bridge with two power transistors connected in series. The power transistors are gated alternatingly conducting and generate at their connection point an alternating voltage for the load. DC-to-AC voltage converters have many uses, such as the supply of power to gas discharge lamps or, after rectifying and smoothing the AC voltage, supplying power to electronic circuits, motors, relays, magnetic valves, magnetic clutches, etc. DC-to-AC power converters are often used in uninterruptible power supplies. When the main power source fails and the uninterruptible power supply provides back-up AC power from the battery supply, the stored DC energy needs to be converted into AC power.
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