Multiphase Power Converter Sequential Switching for Overcurrent Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multiphase power converters face challenges in ensuring stable and safe operation due to high output currents and voltage requirements, necessitating advanced control circuits to manage switch circuits effectively and prevent overcurrent conditions.
Innovation Solution
A control circuit for multiphase power converters that generates control signals based on output voltage and current, enabling sequential control of switch circuits through sub-control circuits, with overcurrent detection and enable selection mechanisms to manage switch operation and prevent overcurrents, enhancing system stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple switch circuits are connected in parallel to output high currents, then the current output capability is improved, but the risk of overcurrent and system stability deteriorates
Solution Approach 1:
The control circuit is divided into multiple sub-control circuits (first sub-control circuit, second sub-control circuit, etc.), each independently controlling a corresponding switch circuit. This segmentation allows individual control of each parallel switch circuit, enabling precise current management and overcurrent protection for each phase, thereby maintaining system stability while achieving high current output capability.
Solution Approach 2:
The control circuit implements feedback mechanisms where each sub-control circuit receives feedback signals (such as fifth feedback signals and sixth feedback signals) from its corresponding switch circuit and adjusts control signals accordingly. This feedback enables real-time monitoring and adjustment of current levels, preventing overcurrent conditions while maintaining high productivity.
2Reliability
If control circuits are added to ensure safety and stable operation, then system reliability is improved, but device complexity increases
Solution Approach 1:
The control circuit is segmented into multiple independent sub-control circuits, each responsible for controlling a specific switch circuit. This modular segmentation reduces the complexity of the overall control system by distributing control functions across multiple simpler units rather than requiring one complex centralized controller, thereby improving reliability without excessively increasing device complexity.
Solution Approach 2:
Each sub-control circuit is designed to perform multiple functions: generating control signals for its corresponding switch circuit, receiving feedback signals, detecting overcurrent conditions, and adjusting operation accordingly. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby improving system reliability while minimizing the increase in device complexity.
Data Source
AI summary
A control circuit generates a set signal based on an output voltage and a reference voltage signal, a total output current and a reference current signal, and each sub-control circuit receives the set signal; a next sub-control circuit receives an enable signal generated by its previous sub-control circuit, and generates a corresponding switch control signal and an enable signal acting on its next sub-control circuit to control the corresponding switch circuit to turn on or turn off based on the received enable signal and the set signal. The present disclosure can control sequential conduction of the plurality of switch circuits through the signal transmission among the multiple sub-control circuits, and can implement overcurrent protection when the total output current is overcurrent, and implement the control of the switch circuit when the total output current is not overcurrent based on the comparison of the output voltage and the reference voltage signal.