Multi-phase Converter Adaptive Voltage Threshold Control
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Solution Overview
Problem
Multi-phase switching converters experience poor transient response and efficiency issues due to undershoots and overshoots in output voltage when switching between multi-phase and single-phase modes, which can be exacerbated by adaptive voltage positioning (AVP) resistance changes affecting phase circuit enabling/disabling.
Innovation Solution
Implementing a method and apparatus that uses adaptive voltage positioning controllers to set and adjust threshold voltage values based on AVP parameters, enabling or disabling phase circuits based on output voltage comparisons to prevent mode bouncing and stabilize output voltage, thereby improving transient response and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adaptive voltage positioning control is implemented to reduce overshoots and undershoots, then output voltage stability is improved, but phase circuit switching thresholds change causing efficiency reduction
Solution Approach 1:
The patent dynamically adjusts the voltage threshold parameter based on the operating mode (single-phase or multi-phase) rather than using a fixed threshold. This allows the system to maintain optimal phase switching decisions while benefiting from AVP control, resolving the contradiction between voltage stability and efficiency by adapting the threshold parameter to current operating conditions
Solution Approach 2:
The system transitions from static fixed threshold control to dynamic mode-dependent threshold control. The threshold automatically adapts between single-phase and multi-phase operating modes, enabling the system to maintain both voltage stability through AVP and efficiency through appropriate phase configuration
2Loss of energy
If phase circuits are switched between enabled and disabled states to improve efficiency at small load currents, then energy consumption is reduced, but output voltage exhibits poor transient response with undershoots and overshoots
Solution Approach 1:
The system proactively adjusts the voltage threshold before phase switching occurs by detecting changes in AVP resistance. This preliminary adjustment prepares the control system for upcoming phase transitions, preventing transient voltage excursions and ensuring smooth mode transitions while maintaining efficiency benefits
Data Source
AI summary
A method and a circuit of operating a multi-phase switching converter is presented. The circuit contains a plurality of phase circuits. The method includes setting an adaptive voltage positioning parameter of an adaptive voltage positioning controller and controlling an output voltage of the multi-phase switching converter using the adaptive voltage positioning controller. The method further includes generating a threshold voltage value based on the adaptive voltage positioning parameter, comparing the output voltage of the multi-phase switching converter with the threshold voltage value and performing at least one of enabling and disabling a phase circuit based on the comparison.