Rack Power Balancing Circuit for Rapid Load Change Stability
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Solution Overview
Problem
Existing power supplies in servers face instability due to rapid changes in power consumption, causing voltage fluctuations and noise in the power supply network, which can lead to device failure or damage.
Innovation Solution
A power balancing device coupled to a server and power shelf through a power busbar, utilizing a control circuit, charging and discharging circuit, and energy storage unit to adjust current based on loading changes, maintaining power supply stability by providing or receiving adjustment current as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing power supplies rapidly draw current to cope with rapid loading changes, then power consumption requirements are met, but voltage fluctuations and noise occur in the power supply network
Solution Approach 1:
The energy storage unit pre-stores electrical energy in advance, enabling the power supply system to rapidly respond to loading changes without drawing current quickly from the input power source. When load increases occur, the pre-charged energy storage unit immediately supplies the required current, avoiding voltage fluctuations and noise in the power supply network.
Solution Approach 2:
The power balancing device acts as an intermediary between the input power source and the server. It buffers rapid current changes by absorbing excess current during low load periods and releasing current during high load periods, thereby isolating the power supply network from rapid loading changes while still meeting the server's power requirements.
2Productivity
If multiple servers cause simultaneous rapid loading changes, then high power consumption is achieved, but instability in the entire power supply network occurs
Solution Approach 1:
The power balancing device serves as a buffer between multiple servers and the input power source. When multiple servers simultaneously experience rapid loading changes, the power balancing device absorbs or releases current to smooth out the aggregate load variations, preventing instability in the entire power supply network while maintaining high power consumption capability.
Solution Approach 2:
The power balancing device dynamically adjusts its equivalent impedance by controlling the charging and discharging of the energy storage unit. This parameter change allows the system to adapt to varying total load conditions, maintaining stability across different power consumption levels while supporting high productivity requirements.
3Adaptability or versatility
If power supplies rapidly adjust current for loading changes, then power flexibility is improved, but noise and voltage drops are generated
Solution Approach 1:
The energy storage unit is pre-charged during periods of low or stable load, storing electrical energy in advance. When rapid power adjustments are needed, the pre-charged energy storage unit immediately discharges to meet the demand, eliminating the need for rapid current drawing from the input power source and thereby preventing noise and voltage drops.
Solution Approach 2:
The power balancing device acts as an intermediary that decouples the server's power adjustment flexibility from the input power source. It absorbs current fluctuations generated by rapid power adjustments and smooths them before passing current to the server, thereby maintaining adaptability while eliminating harmful noise and voltage drops.
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 power balancing device stabilizes the power supply by dynamically adjusting current to match load changes, preventing rapid fluctuations and maintaining the stability of the power shelf and upstream power grid.
Implementation Method 1
an energy storage unit configured to store energy and release energy to provide the adjustment current to the power busbar
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A rack-based power system is used to supply power to a server (10) through a power busbar (50), and includes a power shelf (20) and a power balancing device (30). The power shelf (20) is used to receive an input power and provides an output current (IPSU) to the power busbar (50) so that the power busbar (50) accordingly transmits a system current (ISYS) to supply power to the server (10). The power shelf (20) generates a current command signal (Ishare) according to the output current (IPSU), and transmits the current command signal (Ishare) to the power balancing device (30) through a signal wire (100). When a rising rate of the current command signal (Ishare) exceeds a discharging current threshold (Ith_DCH), the power balancing device (30) provides an adjustment current (IPCS) to the power busbar (50) to supply power to the server (10) together with the power shelf (20). When a falling rate of the current command signal (Ishare) exceeds a charging current threshold (Ith_CHG), the power balancing device (30) receives the adjustment current (IPCS) from the power busbar (50).