Full-Bridge Inverter Control for Module Temperature Balancing
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Solution Overview
Problem
In gradationally controlled voltage inverters, the high heat generation in the sub inverter due to high-frequency operation leads to temperature biases between modules, necessitating larger modules and coolers, which hinders miniaturization.
Innovation Solution
A power converter with a full-bridge inverter configuration, where two arms are mounted on different modules, and a control system that adjusts the operation mode ratio based on temperature rise bias between modules, optimizing high-frequency switching periods to minimize temperature differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency switching operation is performed in the sub inverter, then power conversion efficiency is improved, but heat generation increases causing temperature bias between modules
Solution Approach 1:
The patent applies periodic action by alternating between first and second operation modes in a cyclic manner. The control unit switches between these modes based on temperature feedback, allowing the system to periodically adjust which arm performs high-frequency switching. This periodic alternation prevents continuous heat accumulation in a single module while maintaining overall conversion efficiency.
Solution Approach 2:
The patent changes operational parameters dynamically by switching between different operation modes. In the first mode, the first arm performs high-frequency switching while in the second mode, the second arm performs high-frequency switching. The control unit adjusts these parameter changes based on temperature conditions, allowing optimization of both efficiency and thermal distribution.
2Temperature
If module size is increased to accommodate heat dissipation requirements, then temperature control is improved, but device miniaturization is hindered
Solution Approach 1:
The patent implements feedback control by monitoring temperature conditions and using this information to adjust operation mode selection. The control unit receives temperature information and dynamically changes the operation mode to balance thermal loads. This feedback mechanism allows effective temperature control without requiring oversized cooling components.
Solution Approach 2:
The system performs self-service by automatically adjusting its own operation modes based on temperature feedback. The control unit independently manages the switching between operation modes to balance heat generation across modules, eliminating the need for external thermal management interventions or oversized passive cooling systems.
3Ease of operation
If operation mode is fixed, then control simplicity is maintained, but temperature balance between modules deteriorates
Solution Approach 1:
The patent applies dynamics by making the operation mode flexible rather than fixed. The control unit dynamically switches between first and second operation modes based on real-time temperature conditions. This dynamic adjustment maintains temperature balance while preserving control simplicity through automated decision-making based on temperature feedback.
Data Source
AI summary
Provided are a sub inverter of a full-bridge constituted by two arms: an arm and an arm, each of which is mounted on a different module, a main controller to drive and control the sub inverter by switching an operation mode between a first mode in which a first arm performs a low-frequency switching operation and a second arm performs a high-frequency switching operation, and a second mode in which the second arm performs a low-frequency switching operation and the first arm performs a high-frequency switching operation, and an operation ratio setting circuitry to set an operation ratio on the basis of a bias of a temperature rise between the modules.