Category: PSU

NOTEBOOK POWER SUPPLIES

Notebook computers have been around since the 1980s and they have grown in popularity as prices fell. The problem with notebook computers is the power supply. The same problem exists for many other consumer electronics. See the EPA Energy Star. A good example is the Toshiba A70 desktop replacement laptop computer. The machine uses 19V …

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STANDBY POWER CONSUMPTION

power-plant

One of the hidden costs in modern life is the growth in small wall mounted power supplies to power everything from telephones to answering machines. Everybody has boxes of old power adapters too, they have tended to accumulate over time. What is not realized is that most of these cheap adapters is they trend to …

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EPA ENERGY STAR 5 POWER SAVINGS

As the number of personal computers grew in the early 1980s the EPA stepped in with some initiatives to help reduce the need for additional expensive power plants. Acid rain was the main motivator as coal was still the primary source of power in the late 1970s. Originally in the 1980s the CRT VGA monitor …

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INSIDE THE POWER SUPPLY

power mosfet

The power supply in the PC has evolved over time however the basic technology has remained the same. Most of the changes over the years were driven by many different forces. BRIDGE RECTIFIER It takes 4 power diodes to covert the 115V AC to about 150VDC.  The reason the voltage is higher is that DC …

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