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  The electricity that flows in two ways, AC or alternating current and DC or direct current, is actually a movement of electrons along the conductor. The difference of the two lies in the direction, wherein the former keeps the moving electrons in a switching manner, while the latter is in a steady single track. The AC system of the power supply is utilized for transmitting long distance power to various power companies. Therefore, high voltages are needed to fill the transformers of those companies. DC power supplies, on the other hand, provide current on a small-scale basis. The direct way of supplying a current is typically found in the form of a battery or batteries, in which positive and negative terminals are moving in a single direction. DC power supplies are used in various mechanisms such as car audio equipment, DC-powered radios, mobile phones and a whole lot more. In the competitive market, there are all different kinds of DC power supplies in different wattages and vol...

  Choosing between transformer-based or transformerless uninterruptible power supplies may not be a simple 'either/or' decision, particularly above 10kVA. Both technologies have their place in today's power protection scenarios but the key differences between them are: physical size, efficiency, noise output and the levels of input harmonic distortion that they generate. Both uninterruptible power supply designs produce a tightly regulated source of uninterrupted power but they differ in the way they generate the dc voltage required by their inverters and their output stages. Transformer-based Uninterruptible Power Supplies: until the early 1990s, the only design of online uninterruptible power supply was transformer-based. Nowadays, the design is still available but generally in larger sizes for UPS from eight to 800kVA. The most common applications for this are large industrial sites. This type of UPS has a robust transformer-isolated inverter output, which makes it more ...