Multi-Phase Converter Current Balancing via Analog Mirror
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional multi-phase converters require complex algorithms and calculations for current balancing, leading to thermal and system overload issues due to uneven current distribution among phases.
Innovation Solution
A converter system with current sensors, averaging circuits, and modulators that independently adjust phase currents based on differences from the average current, eliminating the need for complex calculations and algorithms by using current sharing amplifiers to modulate ON-times and achieve balanced current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PWM current mode converters are used for current balancing, then current distribution among phases can be controlled, but the system complexity increases due to required algorithms and calculations
Solution Approach 1:
The patent replaces complex digital algorithms and calculations with an analog current mirror circuit system. The current mirror uses operational amplifiers and transistors to automatically replicate and balance current distribution among phases through analog feedback, eliminating the need for microcontroller-based PWM algorithms and complex digital computations while achieving precise current balancing.
2Productivity
If constant on-time converters are used to improve transient response, then system size and cost are reduced, but complex algorithms are still required for current balancing
Solution Approach 1:
The patent eliminates the need for complex balancing algorithms in constant on-time converters by implementing an analog current mirror circuit that automatically balances current distribution. The operational amplifiers and transistors in the current mirror provide real-time analog feedback control, replacing what would otherwise require complex digital algorithms, thereby maintaining simple constant on-time control while achieving accurate current balancing.
3Device complexity
If current balancing is not implemented, then system complexity is reduced, but thermal and system overload problems occur due to uneven current distribution
Solution Approach 1:
The patent implements a self-balancing current mirror system where the circuit automatically detects and corrects current distribution imbalances among phases without external control. The analog feedback mechanism using operational amplifiers and transistors continuously monitors current levels and automatically adjusts phase currents to maintain balance, providing self-service thermal protection without adding complex control systems.
Data Source
AI summary
A converter for a multi-phase current network can include a plurality of current sensors, each of the plurality of current sensors being configured to detect current for a respective phase of the multi-phase network. A current averaging circuit is configured to provide an indication of the average current for the multi-phase network based on the current detected by each of the plurality of current sensors. A modulator is configured to modulate at least one phase of the multi-phase network independently of each other phase of the multi-phase network based on a difference between the current detected for the at least one phase and the average current for the multi-phase network.