BBU H-Bridge Charge Circuit for Backflow-Protected Charging
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Solution Overview
Problem
Current backup battery units (BBUs) face challenges in ensuring stable and reliable charge and discharge processes, which affect the power supply reliability of storage systems, particularly in the era of big data where power supply stability is critical.
Innovation Solution
A control circuit and method for a BBU that incorporates an improved H-bridge charge unit with switch transistors, diodes, and inductors, allowing for pre-charge, constant-current, and constant-voltage charge modes, along with protection units to prevent current backflow and abnormal charge conditions, ensuring efficient and reliable charging of the BBU pack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional charge circuit is used for the BBU, then the circuit structure is simple, but the charge efficiency and reliability are insufficient
Solution Approach 1:
The charge circuit is divided into multiple independent modules: pre-charge module, constant current charge module, and constant voltage charge module. Each module handles a specific charging stage, improving reliability through modular design while maintaining manageable complexity through functional separation.
Solution Approach 2:
The charge circuit dynamically switches between different charging modes (pre-charge, constant current, constant voltage) based on battery state. The control unit adjusts circuit configuration in real-time, enabling adaptive charging that improves efficiency and reliability without requiring an overly complex fixed architecture.
2Productivity
If multiple charge modes are implemented, then the charge efficiency is improved, but the control complexity increases
Solution Approach 1:
The control unit continuously monitors battery parameters and uses feedback signals to automatically switch between charge modes. This closed-loop control achieves high charge efficiency through adaptive mode selection while keeping control complexity manageable through automated decision-making based on preset criteria.
Solution Approach 2:
The charge circuit automatically determines and transitions between different charging stages without external intervention. The system self-regulates the charging process by monitoring its own state and adjusting modes accordingly, improving efficiency while reducing the burden on external control systems.
3Reliability
If protection units are added to prevent current backflow, then the power supply reliability is improved, but the device complexity increases
Solution Approach 1:
Diodes are introduced as intermediary components to prevent current backflow between different charge modules and the battery. These passive protection elements achieve reliability improvement without requiring complex active control mechanisms, as they automatically block reverse current based on their inherent electrical properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the charge efficiency and reliability of the BBU pack, enabling it to provide stable and reliable power supply by avoiding current backflow and managing charge modes effectively, thus improving the overall power supply stability of storage systems.
Implementation Method 1
a first switch transistor Q5, a second switch transistor Q4, a third switch transistor Q3... control ends of the first switch transistor, the second switch transistor and the third switch transistor are connected to a BBU control unit for switching charge modes of the BBU
Implementation Method 2
a diode D1... an anode of the diode and a first end of the third switch transistor are grounded
Implementation Method 3
an inductor L1... a second end of the first switch transistor is connected to a first end of the inductor L1 and a cathode of the diode; a second end of the inductor L1 is connected to a first end of the second switch transistor
Data Source
AI summary
Disclosed are a control circuit, method, and apparatus for a backup battery unit (BBU), and a storage system, being applied to the technical field of storage. The control circuit includes a BBU charge circuit; the BBU charge circuit includes an improved H-bridge charge unit; and the improved H-bridge charge unit includes a first switch transistor, a second switch transistor, a third switch transistor, a diode, and an inductor.