Multi-BBU Power Balancing by Capacity-Based Current Control
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Solution Overview
Problem
The challenge of using two BBUs for redundant power supply is that current battery capacity and voltage differences can lead to one BBU being exhausted prematurely while the other has significant remaining capacity, causing imbalance and potential discharge pressure.
Innovation Solution
A BBU balanced power supply control system that includes a control circuit, gating circuit, first and second comparison circuits, and an output voltage stabilizing circuit to adjust output currents based on remaining capacity percentages, ensuring balanced power distribution among multiple BBUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two BBUs are used for redundant power supply simultaneously, then backup power capacity is increased and safety level is improved, but current battery capacity and voltage differences cause one BBU to be exhausted in advance while the other has remaining capacity
Solution Approach 1:
The patent implements a feedback mechanism where the control circuit continuously monitors the output current and remaining capacity percentage of each BBU, generates reference level signals based on the ratio of output current to remaining capacity percentage, and adjusts the output current accordingly. This closed-loop feedback system ensures that BBUs with higher capacity or voltage contribute more to the power supply, maintaining balanced discharge and preventing premature exhaustion of any single BBU.
Solution Approach 2:
The patent employs dynamic adjustment of output current based on real-time battery status. The control circuit dynamically modifies the output current of each BBU according to its remaining capacity percentage and voltage levels, rather than using fixed current allocation. This dynamic approach allows the system to adapt to changing battery conditions and maintain optimal power distribution throughout the discharge process.
2Ease of operation
If equal current sharing discharge is carried out, then discharge control is simple, but the BBU with low capacity is exhausted in advance while the other BBU with high capacity has a lot of remaining capacity
Solution Approach 1:
The patent changes the discharge parameters by adjusting the output current of each BBU based on its specific characteristics (remaining capacity percentage and voltage). Instead of using a fixed equal current sharing approach, the system modifies the current parameter dynamically for each BBU according to its state of charge and voltage levels, ensuring that all BBUs are depleted simultaneously and maximizing the overall discharge duration.
3Quantity of substance
If capacity of a single BBU is reduced to use two BBUs together, then battery capacity and size of the single BBU can be reduced in design, but system complexity increases with multiple BBUs requiring balanced control
Solution Approach 1:
The patent implements a self-service mechanism where each BBU's control circuit automatically monitors its own output current and remaining capacity percentage, generates its own reference level signal, and adjusts its own output current without requiring complex external coordination. This decentralized self-service approach simplifies the overall control system while enabling balanced operation of multiple BBUs with different capacities.
Data Source
AI summary
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.