Multiphase Converter Phase Control for Current Balance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multiphase interleaved converters experience inefficiency and instability due to deviations in phase delay and current balance caused by manufacturing variations and measurement-to-control lag, leading to inefficiency and harmonic generation.
Innovation Solution
Implementing a proportional-integral (PI) compensator to adjust phase delay and compensate for measurement and signal propagation delays, ensuring precise switch timing and current balance through a phase error signal and phase timing adjustment module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiphase interleaved converters use fixed-phase relationship between different phases, then the converter structure is simple and easy to control, but manufacturing variations and measurement-to-control lag cause phase delay deviations leading to inefficiency and instability
Solution Approach 1:
The patent implements a feedback mechanism where the controller monitors the actual phase delay between multiphase circuits and compares it with the target phase delay. Based on this feedback, the controller dynamically adjusts control signals to correct phase deviations caused by manufacturing variations and measurement lag, thereby maintaining converter stability without requiring overly complex hardware modifications
Solution Approach 2:
The system employs self-service through automatic phase alignment where the controller autonomously detects phase errors and adjusts timing without external intervention. The measurement-to-control mechanism automatically compensates for its own lag by continuously monitoring and adapting phase relationships, enabling the converter to self-correct stability issues arising from fixed-phase limitations
2Manufacturing precision
If measurement-to-control lag is present in multiphase converters, then the control system is simple and fast to implement, but phase delay deviations occur causing current imbalance and harmonic generation
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing optimal phase delay values for different operating conditions. Before actual control is needed, the system determines the target phase delay based on expected measurements, allowing the controller to compensate for measurement-to-control lag by acting on anticipated rather than reactive information, thereby improving phase precision without proportionally increasing response time
Solution Approach 2:
The system dynamically changes control parameters including phase delay values and timing offsets based on real-time operating conditions. By adjusting these parameters adaptively rather than maintaining fixed values, the system achieves high phase delay precision across varying loads and frequencies while minimizing the time penalty through efficient parameter updates rather than continuous recalculation
3Productivity
If phase delay deviations occur in multiphase converters, then the converter operates with simpler control signals, but efficiency decreases and harmonics are generated
Solution Approach 1:
The controller uses feedback to monitor phase alignment between multiphase circuits and automatically adjusts control signals to maintain optimal phase relationships. This feedback mechanism prevents phase delay deviations that would otherwise cause current imbalance and harmonic generation, thereby maintaining high converter efficiency without requiring complex external correction systems
Solution Approach 2:
The system converts the potentially harmful effect of measurement-to-control lag into a benefit by using the lag information itself as part of the compensation algorithm. The controller measures the actual lag and uses this measurement to pre-adjust phase timing, transforming what would be a source of error into a corrective parameter that improves both efficiency and harmonic performance
Data Source
AI summary
In described examples, a device includes first and second inductors, first and second phase switching circuits, a proportional-integral (PI) compensator, and a controller. The first and second phase switching circuits are respectively coupled to the first and second inductors. The controller is coupled to the first and second phase switching circuits and the PI compensator. The controller performs the following actions. It generates a phase error signal responsive to a phase difference between first and second control signals respectively corresponding to the first and second phase switching circuits, a switching period, and a target phase delay between the first and second control signals. It provides the phase error signal to the PI compensator. And it controls the first and second phase switching circuits in a first phase and a second phase, respectively, responsive to the first and second control signals and a PI compensator output signal.