Feed-Forward Control for DC-DC Voltage Converter Regulation
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Solution Overview
Problem
Existing DC-DC voltage converters in electric or hybrid vehicles face inefficiencies in voltage regulation, particularly requiring significant intervention by the voltage regulator to correct minor fluctuations, which affects dynamic behavior and stability.
Innovation Solution
A feed-forward control system is introduced that adaptively adjusts the controlled variable based on input voltage, allowing the voltage regulator to correct only minor deviations, thereby improving dynamic behavior and reducing intervention in steady-state operations by optimizing the correction function using parameters like operating mode, input current, and intermediate-circuit voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional voltage regulator is used to regulate the output voltage of a DC-DC converter, then the output voltage can be maintained, but the regulator must continuously intervene to correct even minor fluctuations, which increases complexity and reduces dynamic performance
Solution Approach 1:
The feed-forward control calculates a preliminary controlled variable based on the input voltage value before the output voltage deviation occurs. This preliminary control action compensates for input voltage fluctuations proactively, reducing the burden on the feedback regulator and minimizing continuous intervention while maintaining output stability.
Solution Approach 2:
The feed-forward control acts as an intermediary between the input voltage and the regulator. It processes the input voltage value and generates a preliminary controlled variable that mediates the regulation process, allowing the regulator to focus only on correcting residual deviations rather than handling all fluctuations.
2Measurement precision
If the regulator continuously corrects minor voltage fluctuations, then output voltage precision is maintained, but the dynamic behavior and response speed of the system deteriorate
Solution Approach 1:
By calculating the preliminary controlled variable in advance based on input voltage, the system prepares the optimal control setting before output deviation occurs. This reduces the magnitude of corrections needed and allows the regulator to respond more quickly with smaller adjustments, improving both precision and dynamic response.
Solution Approach 2:
The system changes the controlled variable parameter dynamically based on the input voltage value. The feed-forward control adapts the controlled variable according to input conditions, enabling the regulator to operate in an optimized range that balances precision and response speed.
3Ease of operation
If the controlled variable is fixed, then the regulator operation is simple, but it cannot adapt to varying input voltage conditions, reducing efficiency
Solution Approach 1:
The controlled variable transitions from a fixed value to a dynamic value that changes with input voltage conditions. The feed-forward control continuously updates the preliminary controlled variable based on the current input voltage, enabling the system to adapt to varying conditions while maintaining relatively simple regulator operation through automated adaptation.
Solution Approach 2:
The system changes the controlled variable parameter according to input voltage value. This parameter adaptation allows the regulator to maintain optimal performance across different operating conditions without requiring complex manual adjustment, balancing simplicity and adaptability.
Data Source
AI summary
The present invention provides regulation for an output voltage of a DC-DC voltage converter. The controlled variable provided to the regulator of the DC-DC voltage converter is in this case made up of a controlled variable from a voltage regulator and a further controlled variable from an initial controller. The controlled variable from the voltage regulator is in this case obtained directly from the comparison of the output voltage with a setpoint voltage. The controlled variable from the initial controller takes into consideration, inter alia, the input voltage of the DC-DC voltage converter, the value of the input DC voltage being able to be corrected such that the voltage regulator can be operated close to the zero point during steady-state operation. In this manner, faster and more precise regulation of the output voltage is obtained.