26 Power supplies

Due to the rapid expansion in the use of computers in communications and control, and the adoption of many portable devices, the security of power supplies against data corruption and loss of control has become particularly important. The range of such protection varies from small on-board back-up batteries to support volatile memories, to the provision of back-up supplies to protect mains power driven equipment. Such uninterruptible power supplies can be designed to give protection for periods varying from a few minutes up to several hours. The use of high speed digital computer devices that operate from low voltage, high current dc supplies, which may have to support in excess of five times the normal operating current at ...

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