DOUBLE UNINTERRUPTIBLE POWER SUPPLY IN AUTOMATIC TELLER MACHINE INCLUDING COMPARING UNIT AND SWITCHING UNIT

摘要

PURPOSE: A double uninterruptible power supply is provided to allow for a smooth operation of operating system even in the occurrence of over discharge of a battery. CONSTITUTION: A double uninterruptible power supply comprises a comparing unit(60) for comparing a battery voltage and a reference voltage; a switching unit(70) for outputting a voltage to a main power output terminal; and a switching unit(80) for outputting the battery voltage to a main control unit at the point where the battery voltage and the reference voltage become the same, when the battery voltage is lowered due to an over discharge of a battery. The comparing unit is constituted by connecting the terminal of a resistor(R1) connected to the terminal of a battery to another resistor, and connecting the terminal of the resistor(R1) to the positive terminal of a comparator(C1).