BBU BALANCED POWER SUPPLY CONTROL SYSTEM, MULTI-BBU POWER SUPPLY SYSTEM, AND SERVER

A BBU balanced power supply control system, including: a control circuit, a gating circuit, a first comparison circuit, a second comparison circuit, and an output voltage stabilizing circuit. A power supply ratio of each BBU is obtained by the control circuit. The power supply ratio is a ratio of an output current to a remaining capacity percentage. An imbalance of the power supply ratio is converted by the first comparison circuit and the second comparison circuit into a corresponding adjustment signal. Finally, by negative feedback of the output voltage stabilizing circuit, the BBU having the highest power supply ratio is controlled to reduce the output current, and the remaining BBUs participating in redundant power supply are enabled to raise the output current. Also disclosed are a multi-BBU power supply system and a server.