Current Balance Circuit for Multi-Phase Regulators
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Solution Overview
Problem
Multiple phase switching regulators face challenges in delivering balanced current to electronic devices with dynamic current requirements, leading to instability and increased power consumption due to non-ideal characteristics of single switching regulators.
Innovation Solution
A current balance circuit is implemented, comprising a current sensing front end, sensor, average circuit, difference circuit, and calibration circuit, which measures, averages, and adjusts the output of multiple switching regulators to balance current delivery, using feedback loops to ensure equal or proportional current distribution across phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple phase switching regulators are used to meet dynamic current requirements, then current delivery capability is improved, but current imbalance between phases occurs due to non-ideal characteristics
Solution Approach 1:
The patent implements a feedback mechanism where current sensors monitor the output current of each phase, and the measured currents are fed back to the control circuit. The control circuit adjusts the duty cycle of each phase based on the measured current differences, creating a closed-loop system that automatically corrects current imbalances and maintains stable current distribution across multiple phases.
Solution Approach 2:
The patent introduces a current balance control circuit as an intermediary between the multiple phase switching regulators and the load. This control circuit measures the output currents of individual phases, calculates the average current, and generates adjustment signals to balance the current distribution, thereby mediating the current imbalance problem caused by non-ideal characteristics of switching regulators.
2Stability of the object's composition
If current balance circuit is implemented to correct phase imbalances, then current distribution stability is improved, but circuit complexity increases
Solution Approach 1:
The patent combines multiple functions into a single current balance control circuit, including current sensing, averaging calculation, and duty cycle adjustment. By merging these functions into one integrated control unit, the patent reduces the overall circuit complexity compared to having separate control circuits for each phase, while still achieving stable current distribution.
Solution Approach 2:
The current balance control circuit serves multiple functions: it senses the output current of each phase, calculates the average current across all phases, determines the current imbalance, and generates correction signals for each phase. This multi-functional approach reduces the need for separate dedicated circuits for each function, thereby managing circuit complexity while maintaining current distribution stability.
Data Source
AI summary
A current balance circuit including a current sensing front end for sensing an output signal from each of a plurality of switching regulators and a current sensor for receiving the sensed output signal and converting the sensed signal into a sensed current signal. The current balance circuit further includes a current averaging circuit for receiving the sensed output signals and determining an average current output for the plurality of switching regulators and a current difference circuit for receiving the average current value and the sensed current signals and determining a current difference for each of the plurality of switching regulators. A calibration circuit is included for receiving the current differences and calculating a calibration value corresponding to each of the plurality of switching regulators which provides an indication of how to adjust a current output of the plurality of switching regulators to balance the current across the plurality of switching regulators.