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 Picking The Right Power Supply: What You Should Know

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Join date : 2012-10-11

PostSubject: Picking The Right Power Supply: What You Should Know   Tue Oct 23, 2012 9:11 pm

After reading this i hope you'll be able to pick the right power supply for your custom made pc.

Practical Examples\

Big versus small, efficient versus high-performance; we're going to examine three different PCs based on a trio of different usage models, calculate the power supplies they really need, and then explain the right class of PSU to use in them based on quality and long-term environmental impact.

The Frequency Trick

Remember those ancient radios with the vacuum tubes? They were massively built and tended to be clunky, heavy, very functional-looking things. However, it wasn’t just the wooden frame contributing to their weight. The large, massive transformers added their part as well.

The point is, even back then, clever engineers were taking advantage of a neat trick of physics that would later come to be used in every modern switching power supply. In order to convert a high alternating current into a low one and achieve galvanic separation of currents, they used normal, albeit powerful, transformers with a core made of iron plates.

While a mains frequency of 60 Hz required a comparatively large transformer, the so-called output transformers that delivered much higher low-frequency signals between 100 Hz and 16 kHz could be built much smaller while handling the same power. By aggressively capping the frequencies at the lower end of the spectrum, it was possible to increase the power that could be handled by a transformer of the same size. With the invention and subsequent introduction of new components, such as powerful switching tubes, and later, semiconductors using the same underlying physical principle, this advantage was carried over into other fields, opening up new possibilities.

And How Does That Apply To My PC? ( my point Razz)

Due to the high overall power requirements of modern computers, a conventional transformer-based PSU is no longer capable of converting the mains power into the low voltages required by PC components. The transformer required for the job would be too large and consequently far too heavy. Instead, we use switching power supplies that employ the same frequency trick as the good old tube radio. Their job is to provide the required voltages and currents as efficiently as possible, while also reliably maintaining those levels. Analog (linear) solutions are no longer viable solutions. Instead, we now rely on transistors as switches to convert the mains power into higher frequencies, allowing us to use smaller transformers to transmit high power levels. Indeed, this is where the term “switching power supply” comes from. We’ll cover how those work in more detail in the next chapter. Don’t worry, it’s all simpler than you might think.
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