Issues regarding the methods of achieving redundant power supply in switching power supplies

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How to add a picture? In general, our system uses two redundant power supplies. Among them, the instrument power supply is not connected to the control power supply; instead, it is powered by a separate instrument power supply system. On switch -- Switching power supply -- Silicon bridge -- Output terminals. The current problem is as follows: 1. Three sets of silicon bridge connections are overheating, with temperatures reaching 80–100 degrees; the wires used are 2.5 square millimeter BVR soft copper wires. Under normal conditions, the output voltage of each silicon bridge is around 22V, but the output voltage of one of the silicon bridges dropped to around 18VDC, resulting in some solenoids losing power and causing certain parts of the system to stop operating. The silicon bridge is a bridge rectifier circuit that we use to achieve a redundant 24VDC function. It is currently unexplainable why the output voltage of the silicon bridge has become 18VDC. Not completely broken. 2. How is redundancy achieved with 4 diodes in a silicon bridge?