DC/DC Power Conversion Buffering for Dynamic Load Voltage Stability
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Solution Overview
Problem
Conventional servers with centralized computing modes face issues where dynamic changes in energy demand trigger protection mechanisms, leading to server crashes, and current power converter methods cause current distortion on the AC side and affect harmonic components of the power grid.
Innovation Solution
A power conversion system incorporating a DC/DC conversion circuit, energy tank, and controller that detects voltage changes to compensate for dynamic loads by using a switch or bidirectional conversion circuit to buffer voltage drops, maintaining stable output voltages without increasing AC side current distortion or affecting harmonic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional power converters speed up frequency response and slow down voltage drop to meet output voltage specifications, then output voltage stability is improved, but current distortion on AC side increases and harmonic components of power grid are affected
Solution Approach 1:
The patent introduces an energy tank as an intermediary component between the DC/DC conversion circuit and the dynamic load. This energy tank acts as a buffer that absorbs voltage fluctuations and provides compensation current, thereby stabilizing output voltage without requiring the conventional approach of speeding up frequency response that causes AC side current distortion and harmonic issues.
2Adaptability or versatility
If dynamic load changes occur in centralized computing mode, then energy demand adapts to load requirements, but protection mechanisms are triggered causing server crashes
Solution Approach 1:
The patent implements beforehand cushioning by pre-charging the energy tank with sufficient energy before dynamic load changes occur. When load changes trigger voltage drops, the pre-charged energy tank immediately provides compensation current to maintain voltage within safe operating ranges, preventing protection mechanisms from activating and avoiding server crashes while allowing full adaptability to load changes.
3Stability of the object's composition
If PFC circuit increases bus terminal voltage to maximum gain during dynamic load changes, then voltage compensation capability is improved, but system complexity and response time are constrained
Solution Approach 1:
The energy tank serves as a simpler intermediary alternative to complex PFC circuit modifications. By placing an energy tank with appropriate switching control between the DC/DC conversion circuit and the load, the system achieves voltage compensation through direct energy transfer rather than relying on complex PFC circuitry, thereby reducing overall system complexity while maintaining effective voltage stability.
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 system effectively stabilizes output voltages during dynamic load changes, ensuring compliance with specifications and minimizing AC side current distortion and harmonic impact on the power grid.
Implementation Method 1
The energy tank is coupled to the DC/DC conversion circuit... a third DC power stored in the energy tank is provided to the DC/DC conversion circuit to compensate one of the first DC power and the second DC power
Data Source
AI summary
Power conversion system includes a DC/DC conversion circuit, an energy tank, a switch, and a controller. DC/DC conversion circuit is configured to convert a first DC power into a second DC power and provide second DC power to a dynamic load. Energy tank is coupled to DC/DC conversion circuit. Switch is coupled between energy tank and DC/DC conversion circuit. Controller is coupled to energy tank and switch, and is configured to detect a first voltage of first DC power and a second voltage of second DC power to determine a change of dynamic load. When controller detects that first voltage is lower than a first preset voltage or detects that second voltage is lower than a second preset voltage, controller conducts switch so that a third DC power stored in energy tank is provided to DC/DC conversion circuit to compensate one of first DC power and second DC power.