| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an uninterruptible backup power supply device wherein a DC-DC converter or the like that are usually provided in a main circuit and causes degradation in reliability during normal operation, is removed from a main circuit to ensure reliability and at the time of service interruption or voltage drop, power supply is changed to backup power supply without an instantaneous interruption. <P>SOLUTION: The uninterruptible backup power supply device is comprised of: a main circuit that is connected only by a diode; a first sub-circuit in which a step-up DC-DC converter branched from the input side of the diode of the main circuit and connected in parallel with the main circuit, a charger, and a step-down DC-DC converter are connected in series in this order; a second sub-circuit comprised of a parallel circuit of a backup power supply branched from the output side of the charger and connected in parallel with the step-down DC-DC converter and a contact of a relay circuit; and a control circuit comprised of a voltage detection unit branched from the input side of the diode of the main circuit and connected with both ends of the backup power supply and the relay circuit. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
