Keywords:
USB disc drive
bus-powered
wall wart
Every system that supplies power must incorporate some kind of power limits. Definitely, we don't want our PC monitors to go black once a mouse is plugged in. However, plugging a
USB disc drive could generate some hefty current surges. To arrive at a solution, this article discusses the wall warts that waste so much of our electricity as the key power issue.
Wall Warts will not be disappearing anytime soon, but different sectors are pushing to get rid of as many as possible. Unfortunately, there are many consumer electronics companies not creative enough to solve the problem AND remain USB compliant. USB compliance assures end users are not confused, frustrated, or worse, damaging their PC or the peripheral device due to poor power management. It is the wise designer that considers the power constraints of USB, designs to meet the specification, and recognises that the end market will reward them with greater sales due to reliable, effective, useful bus-powered components.
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votes:
Design 101
