DC power supply
A number of power supply arrangements are presently commercially available to provide a precise output irrespective of the variations in AC input voltage and changes in the load. A power supply producing a regulated DC load current from an AC power source typically has a converter having input terminals adapted for connection to the AC source and output terminals adapted for connection to a load. DC power supplies employing an inverter may be used for, for example, an arc welder, an arc cutter, a plasma arc welder and an arc lamp. These apparatuses may be designed such that they can be driven from either one of two types of commercial AC power supplies one of which supplies a voltage of a magnitude half that of the other. DC power supplies energized by the AC power lines must convert the input AC voltage to a desired DC voltage level; this conversion can be accomplished in either an active manner or a passive manner. When an apparatus using a DC source as an operating power supply is operated by power supplied from a commercial power supply, an AC adapter for rectifying and smoothing voltage signals supplied from the commercial power supply and for outputting resultant voltage signals is used. This AC adapter is configured in such a way as to have a power supply transformer, a rectifier diode, and a smoothing capacitor. Thus, an output voltage thereof changes according to a variation in a load current or in a voltage of a commercial power supply. Most DC power supplies typically involve the use of a power transformer in order to step-down the voltage from the 110 VAC line source to a lower AC voltage, such as 24 VAC. DC flyback power supplies use a power transformer to convert a first DC potential to one or more second DC potentials. In a flyback type of power supply, power is first transferred to the power transformer via the primary winding, and, after conduction in the primary winding has ceased, the stored power is coupled out through the secondary winding to an output rectifier circuit for generating the desired output DC voltage level. Regulation of this output voltage level is accomplished by controlling the amount of energy stored in the magnetic field of the transformer during each cycle.
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