Power Supply Soft-Start Control with Voltage-Frequency Loop Switching
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Solution Overview
Problem
Existing power supply soft-start methods, particularly in server systems, face instability and voltage fluctuations due to the transition from resonance circuits to pulse width modulation, affecting the stability and efficiency of the soft-start process.
Innovation Solution
A power supply soft-start control method that involves obtaining voltage and frequency step values to control respective loops, with voltage adjustments prioritized when the voltage set value is higher and frequency adjustments when the frequency set value is higher, ensuring balanced control and reducing voltage fluctuations by integrating frequency feedback into the soft-start process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a while cycle mode is adopted to gradually increase voltage from 0V to 12V, then the soft-start process can be completed, but voltage fluctuation occurs at the end of soft-start affecting stability
Solution Approach 1:
The patent applies dynamics by making the control mode switchable between voltage adjusting loop and frequency adjusting loop based on real-time conditions. The system dynamically transitions from frequency adjustment phase to voltage adjustment phase, allowing the control strategy to adapt during the soft-start process rather than using a fixed while cycle mode, thereby reducing voltage fluctuation at the end of soft-start.
Solution Approach 2:
The patent changes the control parameter from fixed voltage increment to dynamic parameter selection. By introducing a judgment mechanism that compares voltage step value with frequency step value, the system selects different control parameters (voltage step or frequency step) at different stages, optimizing the soft-start process and eliminating voltage fluctuation issues.
2Reliability
If voltage adjusting loop controls the soft-start output voltage throughout the entire process, then voltage control is maintained, but frequency adjustments are not considered leading to instability
Solution Approach 1:
The patent segments the soft-start control process into two distinct phases: a frequency adjusting phase and a voltage adjusting phase. By dividing the control process and assigning different control loops to different phases, the system achieves stable control without requiring both loops to operate simultaneously, thus managing complexity while improving reliability.
Solution Approach 2:
The patent implements dynamic control by enabling the system to switch between frequency adjusting loop and voltage adjusting loop based on real-time conditions. This dynamic approach allows the system to use frequency adjustment when needed and voltage adjustment when appropriate, achieving stable power supply control while maintaining manageable system complexity through conditional activation rather than continuous operation of both loops.
3Reliability
If frequency adjusting loop controls the soft-start output voltage, then frequency feedback is provided, but voltage control precision may be reduced
Solution Approach 1:
The patent applies dynamics by making the control mode switchable between voltage adjusting loop and frequency adjusting loop based on real-time conditions. The system dynamically transitions from frequency adjustment phase to voltage adjustment phase, allowing the control strategy to adapt during the soft-start process rather than using a fixed while cycle mode, thereby reducing voltage fluctuation at the end of soft-start.
Solution Approach 2:
The patent applies preliminary action by using frequency adjustment in the early stage of soft-start to prepare the system for stable voltage control. The frequency adjusting loop performs preliminary stabilization work before the voltage adjusting loop takes over, ensuring that when precise voltage control begins, the system is already in a stable state, thus maintaining both stability and precision.
Data Source
AI summary
A power supply soft-start control method, control apparatus and control device, and a storage medium. Frequency adjustment is added to a power supply soft-start process. A voltage step value is utilized to control a voltage adjusting loop to perform voltage feedback adjustment, and a frequency step value is utilized to control a frequency adjusting loop to perform frequency feedback adjustment. In an adjusting process, according to a voltage set value of the voltage adjusting loop and a frequency set value of the frequency adjusting loop, one of the voltage adjusting loop and the frequency adjusting loop is selected to control a soft-start output voltage, whereby voltage adjustment and frequency adjustment are mutually restricted.