Patent ID: 9685821
Date: 2017-06-20
CPC Classifications: H02J

Claim:
1. An uninterruptible direct current (DC) power supply system which continuously supplies DC power to a load, the uninterruptible DC power supply system comprising: a first connection unit electrically connected to a DC power conversion system which converts prevailing AC power into the DC power; a second connection unit which is electrically connected to the load and supplies the DC power to the load; an auxiliary power supply charged by the DC power; and an uninterruptible control unit which supplies the DC power supplied from the DC power conversion system normally connected to the first connection unit to the load through the second connection unit, charges the auxiliary power supply, and controls power to be continuously supplied to the load while perfectly cutting off electrical connection between the DC power conversion system and the auxiliary power supply when the DC power conversion system is disconnected from the first connection unit, is damaged, or short-circuits; wherein the uninterruptable control unit comprises a connection controller which comprises a relay connected to the first connection unit, controls connection between the first connection unit and the relay to be cut off when the DC power conversion system is disconnected from the first connection unit, is damaged, or short-circuits, and controls the first connection unit and the relay to be connected to each other when the DC power conversion system is normally connected to the first connection unit.