| 摘要 |
<p>PURPOSE:To eliminate wasteful memory saving and to improve work efficiency by preventing a terminal unit, etc. from unnecessarily speedily outputting a power failure signal against the trouble of a power source in a short time. CONSTITUTION:In the case of a route 1, a noise filter 11 removes noise, supplies power to the terminal unit as it is through a switch 15, and a rectifier 12 converts an alternate current into a direct current, whereby the power is accumulated in a charger 13. When the trouble of the power source occurs in the case of a route 2, an invertor 14 converts the direct current into the alternate current and a backup power source is fed to the terminal unit through a switch 15. At the same time, a control circuit 17 detects the use condition of an AC plug socket 18 by a sensor from the switch 15 and interrupts the unused AC socket plug 18. The control circuit 17 comes to the state of the route 1 when commercial power is restored before the power failure signal is outputted in the trouble of the power source in a short time. Thus, unnecessary memory saving is evaded.</p> |
