Power Converter Junction Temperature Control via Dynamic Derating
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Solution Overview
Problem
Power generating systems, such as solar and wind turbines, face inefficiencies and potential failures due to excessive junction temperatures in semiconductor components, which can be caused by various environmental and operational factors, leading to undesirable shutdowns and reduced system uptime.
Innovation Solution
An electrical power generating system with a controller that applies a junction temperature derating function to limit peak junction temperatures by reducing power output until a predetermined condition is met, using temperature sensors and derating factors to manage operating temperatures within safe margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the converter is shut down when junction temperature reaches upper limit, then semiconductor reliability is protected, but system productivity is reduced
Solution Approach 1:
The patent implements dynamic power adjustment by continuously monitoring junction temperature and adjusting converter output power in real-time. Instead of static shutdown thresholds, the system dynamically modifies operating parameters based on thermal conditions, allowing the converter to operate at reduced power levels when temperature approaches limits rather than complete shutdown, thus maintaining partial productivity while protecting semiconductor reliability.
Solution Approach 2:
The system employs feedback control by continuously measuring junction temperature and using this information to adjust power output. The controller receives temperature feedback from sensors and automatically adjusts converter operation to maintain temperature within safe operating ranges, preventing thermal runaway while optimizing power delivery and avoiding unnecessary shutdowns.
2Temperature
If cooling systems operate at high capacity, then junction temperature is controlled, but energy consumption increases
Solution Approach 1:
The patent maintains continuous thermal management by keeping cooling systems operational at variable levels rather than switching them on and off. The cooling capacity is continuously adjusted to match thermal load conditions, ensuring uninterrupted heat dissipation while minimizing energy consumption by operating at the lowest necessary capacity level.
Solution Approach 2:
The system changes operating parameters of the cooling system based on thermal conditions. Instead of running at fixed high capacity, the cooling system's operational parameters (such as fan speed, pump flow rate, or compressor capacity) are adjusted according to measured temperature and power load conditions, optimizing the balance between temperature control and energy consumption.
Data Source
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AI summary
An electrical power generating system including a power generating device, a power converter connected to the power generating device, and an electrical controller connected to the power converter. The electrical controller is configured to limit a peak junction temperature of the power converter by applying at least one junction temperature derating function.