Electric Energy Converter Control With Variable Power Limits
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Solution Overview
Problem
Existing electric energy converter control methods limit maximum output power at all operating points to the minimum of maximum powers across the range, restricting optimization and requiring reduction of operating ranges to prevent extreme conditions, which is not satisfactory for achieving optimal performance.
Innovation Solution
A method that determines a variable maximum output power for each operating point, allowing dynamic adjustment of limiting factors such as input and output currents, and activating limiting means based on comparisons to prevent exceeding these values, thereby optimizing power output and expanding operating ranges without fixed maximum power constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant maximum output power Pmax is applied at all operating points, then the converter is protected from exceeding power limits, but the maximum output power is restricted at operating points where higher power could be safely delivered
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant maximum power limit to a dynamic variable maximum power limit that adapts to each operating point. The control method calculates a specific maximum power value for each operating point based on component constraints, allowing the power limit to vary dynamically rather than remaining fixed, thus resolving the contradiction between protection and power optimization.
Solution Approach 2:
The patent changes the parameter of maximum power from a constant value to a variable value that depends on operating conditions. By calculating different maximum power values for different operating points based on component constraints (current ratings, thermal limits), the system optimizes power delivery while maintaining protection, directly addressing the contradiction between fixed protection limits and variable power potential.
2Reliability
If the operating range is reduced to prevent extreme conditions, then the converter operates within safe limits, but the versatility and adaptability of the converter is reduced
Solution Approach 1:
The patent applies local quality by providing tailored maximum power limits for each specific operating point rather than applying a uniform restriction across all operating conditions. Each operating point receives a customized power limit calculation based on its specific constraints (input voltage, output voltage, component ratings), allowing the converter to operate at optimal power levels locally at each point while maintaining overall safety and reliability.
3Reliability
If three separate constraints (maximum power Pmax, maximum input current Ilow-side/max, maximum output current Ihigh-side/max) are applied, then comprehensive protection is achieved, but the device complexity increases with multiple comparators and sensors
Solution Approach 1:
The patent merges the three separate constraints (maximum power, maximum input current, maximum output current) into a unified control approach. Instead of independently managing each constraint with separate comparators and control paths, the method integrates them into a single variable maximum power calculation that inherently accounts for all three constraints, thereby reducing control circuit complexity while maintaining comprehensive protection.
Solution Approach 2:
The patent creates a universal control mechanism where a single variable maximum power limit serves multiple protection functions simultaneously. The calculated maximum power value for each operating point inherently incorporates constraints for power, input current, and output current, making one control parameter multi-functional and eliminating the need for separate constraint management circuits.
Data Source
AI summary
A method for controlling an electric energy converter, which includes, for at least one first physical quantity of the converter having a variable maximum that is a function of a plurality of possible operating points, each possible operating point being associated with a value of the variable maximum and being defined by a value of at least one operating parameter of the converter: determining a current operating point of the converter from the plurality of possible operating points; determining the value of the variable maximum associated with the current operating point, referred to as a first value; determining a current value of the at least one first physical quantity, referred to as a second value; and activating or not activating a limiter circuit, which limits the at least one first physical quantity, as a function of a result of a comparison between the first value and the second value.