Concentration Control Circuit for Multi-Phase Power Converter
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Solution Overview
Problem
Multi-phase power supply circuits face limitations in dynamic response due to fixed frequency control methods, which may not meet the demands of modern electronics, particularly for CPU power supplies, and require complex phase-locked loop circuits for variable frequency control.
Innovation Solution
A concentration control circuit that generates a current reference signal to adjust phase current and a clock signal to adjust switching frequency and phase, using a voltage feedback circuit, slope detection circuit, clock signal generation circuit, divider circuit, and multiplexer circuit to enable fast dynamic response without additional current sharing circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed frequency control method is used, then device complexity is reduced, but dynamic response speed deteriorates
Solution Approach 1:
The patent implements variable frequency control by dynamically adjusting the switching frequency based on load conditions. The control circuit modifies the clock signal frequency in real-time according to the current reference signal, enabling fast dynamic response without requiring complex phase-locked loop circuits in each power stage.
Solution Approach 2:
The concentration control circuit serves multiple functions: it generates the current reference signal, produces the clock signal for frequency control, and regulates phase currents across all power stages. This multi-functional approach eliminates the need for separate current sharing circuits in each phase, reducing overall device complexity while maintaining fast response.
2Speed
If variable frequency control is implemented using phase-locked loop circuits, then dynamic response speed is improved, but device complexity increases
Solution Approach 1:
The patent merges the frequency control and current regulation functions into a single concentration control circuit. By combining the clock signal generation with the current reference signal generation, the system achieves variable frequency control without requiring separate phase-locked loop circuits in each power stage, thereby reducing overall complexity.
Solution Approach 2:
The control circuit uses the current reference signal as an intermediary to coordinate both the switching frequency and phase current regulation. This single reference signal mediates the control of multiple power stages, enabling synchronized variable frequency operation without complex inter-stage communication or additional phase-locked loop circuits.
3Manufacturing precision
If additional current sharing circuits are added to each power stage, then current regulation precision is improved, but device complexity increases
Solution Approach 1:
The concentration control circuit performs the current sharing function universally for all power stages through a single current reference signal. This multi-functional approach provides precise current regulation across all phases without requiring individual current sharing circuits in each power stage, thereby maintaining precision while reducing complexity.
Solution Approach 2:
Each power stage automatically regulates its current by following the common current reference signal generated by the concentration control circuit. The stages self-adjust their operation based on the shared reference, eliminating the need for additional active current sharing circuits while maintaining precise current balance across all phases.
Data Source
AI summary
A concentration control circuit can include: a voltage feedback circuit configured to generate a current reference signal representing an error between a voltage reference signal and an output voltage feedback signal shared by each of a plurality of power stage circuits of a multi-phase power converter to adjust a respective phase current; and a clock signal generation circuit configured to generate a clock signal to adjust at least one of switching frequency and phase of each of the power stage circuits, where the clock signal is adjusted in accordance with a change of the current reference signal.