| 摘要 |
PCT No. PCT/GB92/01058 Sec. 371 Date Apr. 14, 1993 Sec. 102(e) Date Apr. 14, 1993 PCT Filed Jun. 12, 1992 PCT Pub. No. WO92/22949 PCT Pub. Date Dec. 23, 1992.A power fail detection circuit in electrically powered apparatus comprises a power switch for the apparatus and power detection means responsive to the absence of electrical power from the power switch to provide a power fail indication. The power switch has at least one double throw pole, switchable between power-ON and power-OFF terminals, and the circuit includes switch position detection means connected to the power-OFF terminal and which is responsive to the power switch being in the power-OFF position to disable the power fail indication.
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