Rack Server BBU Voltage Detection and Seamless Power Transfer
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Solution Overview
Problem
Current rack server systems with battery backup units (BBUs) face issues such as the lack of AC-grid power detection circuits in BBUs, inefficient power supply during AC-grid instability, and potential server failures due to insufficient power storage, leading to unreliable operation and data loss.
Innovation Solution
A rack server system with a BBU that includes a voltage detector and micro-controller to monitor the output voltage from the AC/DC power supplier, switching to provide power when the voltage drops below a threshold, using a blocking circuit to ensure seamless power transfer and prevent backflow, and utilizing a lithium battery for efficient energy storage, thereby reducing the need for AC-grid power detection and enhancing system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BBU includes an AC-grid power detection circuit to detect power instability, then the reliability of power switching improves, but the device complexity and difficulty of detection increase due to cosine wave interference and erroneous detection
Solution Approach 1:
The patent introduces a notification signal as an intermediary between the AC/DC power supplier and BBU. The power supplier detects AC-grid instability and sends a notification signal to the BBU, which then activates. This mediator approach allows the BBU to respond reliably to power issues without needing its own complex AC-grid detection circuit, avoiding the cosine wave interference problem entirely.
Solution Approach 2:
The patent replaces the electrical/direct detection mechanism (BBU directly detecting AC-grid voltage) with a signal-based notification mechanism. Instead of the BBU measuring voltage waves directly, it receives a digital notification signal from the power supplier, substituting a simpler control signal system for a complex electrical measurement system.
2Device complexity
If the BBU is directly connected in parallel with the server without proper detection, then the device complexity is reduced, but the power supply efficiency decreases and the server may fail due to insufficient power storage
Solution Approach 1:
The patent implements a feedback mechanism where the AC/DC power supplier continuously monitors AC-grid power status and sends notification signals to the BBU when instability is detected. This feedback loop ensures the BBU activates at the appropriate time based on actual power conditions, preventing both premature activation (which would reduce efficiency) and delayed activation (which would compromise reliability).
Solution Approach 2:
The BBU is kept in a charged standby state with sufficient power storage before AC-grid failure occurs. The system performs preliminary charging actions during normal operation, ensuring the BBU has adequate energy reserves ready to immediately take over when the power supplier sends a notification signal, avoiding server failure due to insufficient power.
3Reliability
If the AC/DC power supplier notifies the BBU of power instability, then the power transfer timing improves, but the loss of time for notification and switching may occur
Solution Approach 1:
The BBU maintains charged power storage in advance during normal operation, so when the notification signal arrives, it can immediately activate without needing to charge first. This preliminary preparation eliminates charging time during the switching process, reducing overall time loss while maintaining accurate timing based on the notification signal.
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 ensures timely and efficient power supply to the server, reducing the likelihood of server failures and data loss by automatically detecting voltage changes and switching to BBU power, while maintaining system efficiency and stability, even during AC-grid power instability.
Implementation Method 1
utilizing a lithium battery for efficient energy storage
Implementation Method 2
converting an input voltage into a first output voltage when the input voltage is normal
Data Source
AI summary
A rack server system including at least one server and a battery backup unit (BBU) is provided. A power supplier is coupled to the server for converting an input voltage into a first output voltage when the input voltage is normal and for providing the first output voltage to the server. The BBU is coupled to the server and the power supplier for detecting the first output voltage outputted from the power supplier and for providing a second output voltage to the server when the input voltage and/or the first output voltage are abnormal.