Redundant power supply device for improving operation reliability of control system

The utility model relates to the technical field of DCS, and discloses a redundant power supply device capable of improving operation reliability of a control system, the redundant power supply device comprises a UPS battery, a UPS controller, an isolation relay and a static change-over switch, the UPS battery is connected with the UPS controller, an INPUT1 input end of the static change-over switch is connected with a UPS output power switch and is used for supplying power by using the UPS battery, and an INPUT1 output end of the static change-over switch is connected with a UPS output power switch. The INPUT2 input end of the static change-over switch is connected with a mains supply input switch and used for municipal power supply, and the input end of the isolation relay is connected with a relay switch. According to the utility model, the static change-over switch (STS) is additionally arranged on the UPS power supply loop, undisturbed switching between the UPS output power supply and the input commercia