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How green is my power supply?
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Автор:  san [ 26 серпня 2014, 01:23 ]
Тема повідомлення:  How green is my power supply?

How green is my power supply?
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Most electronic devices work best with direct current power. Thomas Edison advocated dc power distribution, but we use George Westinghouse’s ac power distribution system because, as Nicola Tesla pointed out, you can move electricity over long distances much more efficiently as high-voltage, low-current ac. Once you get electric power where you need it, however, the fact remains that you need dc to do anything useful but make light and heat.
A dc power supply’s job, then, is to convert ac supply current to dc at whatever voltage your end equipment needs. As shown in “Linear regulated power supply,” a dc power supply does the conversion in two stages: rectification and regulation.
Rectification converts ac current, which periodically switches flow direction, to dc current, which doesn’t. The full wave bridge rectifier shown puts out pulsating dc, which includes a heavy dose of ac mixed in with the dc. Generally, a low-pass filter follows to clean out most of this residual ac.


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