Multi-Phase Power Converter Current Balancing for Switch Temperature Control
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Solution Overview
Problem
Conventional multi-phase power converters experience temperature deviations between switches due to varying structural positions and operational conditions, which limits heat dissipation and increases costs when trying to mitigate these deviations.
Innovation Solution
A multi-phase power converter with a controller that differentially distributes currents among power conversion units based on the temperature of each switch, using NTC temperature sensors and resistance characteristic curves to minimize temperature deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat dissipation area is increased to prevent temperature deviation, then temperature uniformity is improved, but topology size and cost increase
Solution Approach 1:
The patent changes the operational parameters (current magnitude) of power conversion modules based on their temperature conditions. By dynamically adjusting the current handled by each module according to its temperature state, the system achieves temperature uniformity without increasing the physical heat dissipation area, thus resolving the contradiction between temperature uniformity and device size.
2Temperature
If heat dissipation area is increased to prevent temperature deviation, then temperature uniformity is improved, but cost increases
Solution Approach 1:
The patent implements dynamic parameter adjustment of current magnitude based on temperature feedback. This control strategy achieves temperature uniformity through operational optimization rather than through expensive hardware upgrades or increased heat dissipation structures, thereby reducing manufacturing costs while maintaining temperature uniformity.
3Temperature
If current magnitude is varied based on temperature, then temperature deviation is reduced, but control complexity increases
Solution Approach 1:
The patent employs a feedback control mechanism where temperature information from each power conversion module is continuously monitored and used to adjust the current magnitude of that module. This closed-loop feedback system automatically compensates for temperature deviations, reducing the need for complex manual control strategies while achieving effective temperature balancing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively minimizes temperature deviations between switches by adjusting current magnitudes based on switch temperatures, thereby optimizing heat dissipation and reducing costs associated with increased topology size and price.
Implementation Method 1
The controller may obtain the switch temperature in each of the plurality of power conversion units through an NTC temperature sensor attached to a switch of the power conversion unit.
Data Source
AI summary
A multi-phase power converter and a control method thereof according to a preferred embodiment of the present disclosure can minimize a temperature deviation between switches by varying the magnitude of current to be handled by a power conversion module of the multi-phase power converter based on the temperature of the switch.