Multi-Phase Converter Control Circuit for Inductor Current Balancing
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Solution Overview
Problem
In multi-phase converters, inductor mismatching leads to unbalanced inductor currents between channels, which can affect the efficiency of current distribution and require current balance control to reduce inductor sizes effectively.
Innovation Solution
A control circuit that includes an inductor current sampling circuit, error circuit, and modified circuit to generate sampling signals that balance inductor currents by modifying sampling signals based on error signals, ensuring equal current distribution across channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multi-phase parallel interleaving is adopted to reduce inductor sizes, then inductor current distribution becomes unbalanced due to inductor mismatching, but this approach is necessary to reduce overall converter size
Solution Approach 1:
The patent implements a current balance control mechanism that continuously monitors inductor currents through sampling circuits and uses feedback signals to adjust the duty cycles of individual phases. The control circuit calculates current differences between phases and dynamically modifies switching signals to maintain balanced current distribution, thereby resolving the contradiction between reduced inductor size and maintained current balance.
Solution Approach 2:
The system dynamically adjusts the duty cycles of each phase based on real-time current measurements. Rather than using fixed switching parameters, the control circuit continuously adapts the switching characteristics of each phase to compensate for inductor mismatches, enabling the system to maintain optimal current balance despite component variations and load changes.
2Productivity
If inductor mismatching is present in multi-phase converters, then current distribution efficiency decreases, but achieving perfect matching increases manufacturing complexity and cost
Solution Approach 1:
The control system automatically compensates for inductor mismatches without requiring manual calibration or precise manufacturing. The current balance control circuit continuously monitors and adjusts phase currents based on actual measurements, enabling the system to self-correct for component variations and maintain high current distribution efficiency despite manufacturing tolerances.
3Stability of the object's composition
If current balance control is implemented to compensate for inductor mismatching, then control circuit complexity increases, but this is necessary to achieve effective current balancing
Solution Approach 1:
The control circuit is divided into modular functional blocks including current sampling circuits for each phase, difference calculation units, and duty cycle adjustment modules. This segmentation allows the complex current balance control to be implemented through coordinated simple operations in each module, managing overall system complexity while achieving effective current balancing.
Data Source
AI summary
A control circuit of a multi-phase converter can include: an inductor current sampling circuit configured to generate a plurality of sampling signals corresponding to a plurality of channels of the multi-phase converter, where each of the sampling signals characterizes an inductor current of a corresponding channel; an error circuit configured to generate a plurality of error signals corresponding to the plurality of channels, where each of the error signals characterizes an error between the inductor current of the corresponding channel and a reference current; and a modified circuit configured to modify the sampling signals of the corresponding channels according to the plurality of error signals to generate a plurality of modified sampling signals, where the control circuit balances the inductor currents between the plurality of channels according to the plurality of modified sampling signals.