Power Converter Thermal Feedback Control for Overload Operation
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Solution Overview
Problem
Existing power converters in aerospace and automotive electronic control units lack temperature-dependent protection mechanisms, leading to potential overheating and failure when operating beyond rated maximum output power, with current protection strategies failing to address temperature-related risks.
Innovation Solution
A method and system for a power converter that includes determining a temperature metric based on previous operation, comparing it to a reference temperature, and adjusting control parameters like switching frequency or duty cycle to manage temperature, thereby preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power converter operates beyond rated maximum output power, then power output capability is improved, but temperature rises excessively leading to potential failure
Solution Approach 1:
The control system continuously monitors the temperature metric of the power converter and adjusts the output power accordingly. When temperature exceeds the reference threshold, the controller reduces output power to prevent overheating, creating a closed-loop feedback mechanism that dynamically balances power output and thermal management.
Solution Approach 2:
The power converter transitions from static rated power operation to dynamic power adjustment based on real-time temperature conditions. The output power capability becomes adaptable, allowing the system to operate beyond rated power when cool and reduce power when hot, optimizing both performance and safety.
2Reliability
If output current is limited to rated value for protection, then device safety is improved, but power output capability deteriorates
Solution Approach 1:
The protection mechanism changes from fixed current limiting to temperature-based dynamic control. Instead of maintaining constant current limits regardless of thermal conditions, the system adjusts operating parameters based on actual temperature metrics, allowing higher power output when temperatures are acceptable while still providing protection when limits are approached.
3Power
If time-based protection scheme is used to permit excess current, then short-term power capability is improved, but complete loss of output occurs when limit is exceeded
Solution Approach 1:
The system implements continuous temperature monitoring and feedback control, replacing discrete time-based protection with ongoing thermal assessment. This allows the power converter to maintain operation at reduced power levels when temperature thresholds are approached, rather than completely shutting down, ensuring continuous but moderated power delivery.
Data Source
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AI summary
A method (300) of operating a power converter for converting an input voltage and/or an input current to an output voltage and/or an output current. The method includes determining (310) a temperature metric, representative of a temperature of the power converter during a period of operation, based on a temperature of the power converter at an end of a preceding period of operation. The method includes comparing (320) the temperature metric to a reference temperature metric, representative of a reference temperature. The method includes determining (330) a value of a control parameter, used to control the output current and/or the output voltage of the power converter, based on the comparison (320). The method includes operating (340) the power converter using the control parameter. The temperature of the power converter depends on the value of the control parameter.