We can find many applications of AC in business, we still discover there are lots of industrial processes that require DC for their own operation.
Some of those applications include battery charging, emergency lighting, welding, electroplating, metal refining, metal reduction, communications and lots of more.
Unlike AC generators, the rate of DC generators isn’t so critical. Therefore, little DC generators can be belt-driven, gear-driven or direct driven by prime movers. Large DC generators are always direct driven. Some of the prime movers used are AC motors, petrol or diesel engines, steam or water turbines.
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Little DC generators are driven from 300 to 1800 rpm, while larger generators are driven from 60 to 250 rpm. Due to line voltage drops, the direct current produced is only transmitted over short distances.
For convenience, many DC software uses rectifiers to convert AC supply to DC supply. These rectifiers usually take advantage of solid-state semiconductors as they have no moving parts and are extremely robust in construction. When such rectifiers are used, some kind of wave filters will need to be installed to smoothen out the pulsating DC supply obtained through rectification.
For short-term applications, batteries are utilized to supply the essential DC supply. These must be recharged during and after usage by DC generators or rectifiers. The DC supply obtained from batteries are smooth.
Lots of people do not know it, but the creation of AC power demands using a DC supply during its field coil to keep a constant magnetic field. This source of DC supply is obtained from either a DC generator or a rectifier unit.