Direct-current looped network protection device and direct-current power supply system

The utility model relates to a direct-current looped network protection device and a direct-current power supply system, and the device comprises a fault detection circuit, a control circuit, a first switch, a second switch and a full-bridge DCDC conversion circuit. When a bus looped network fault occurs, fault isolation protection is carried out on a load through the full-bridge DCDC conversion circuit, and a looped network fault protection function is realized. 本公开涉及一种直流环网保护装置和直流电源系统，所述装置包括故障检测电路、控制电路、第一开关、第二开关以及全桥DCDC变换电路，本公开实施例提供的直流环网保护装置可以监测母线运行状态，当出现母线环网故障时通过全桥DCDC变换电路对负载进行故障隔离保护，实现环网故障保护功能。