DC-DC Converter Voltage Drop Compensation for Battery De-rating
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Solution Overview
Problem
Existing voltage drop compensation systems for DC-DC converters fail to reflect voltage drop compensation in the output voltage when de-rating occurs, leading to suboptimal battery operation and increased risk of faults in the DC-DC converter.
Innovation Solution
A voltage drop compensation control system that includes a controller generating a compensation voltage command by applying first and second control values to the output voltage command, based on the error between the DC-DC converter's output voltage and battery voltage, and using proportional and low-pass filtering to adjust for voltage drops and de-rating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage drop compensation is applied to the output voltage command, then battery operation optimality is improved, but when de-rating occurs (current limit of battery or output current limit of DC-DC converter), the voltage drop compensation cannot be normally reflected in the output voltage
Solution Approach 1:
The controller segments the voltage drop compensation into two distinct control values: a first control value applied during normal operation to optimize battery performance, and a second control value applied during de-rating conditions. This segmentation allows the system to handle different operating conditions independently, resolving the contradiction between maintaining optimal battery operation and properly responding to de-rating events.
Solution Approach 2:
The system dynamically adjusts which control value is applied based on real-time detection of de-rating conditions. When current limits are detected (either battery current limit or DC-DC converter output current limit), the controller switches from applying the first control value to applying the second control value. This dynamic adaptation ensures the system responds appropriately to changing operational states, resolving the contradiction between consistent optimization and conditional adaptability.
2Productivity
If the DC-DC converter outputs voltage with voltage drop compensation, then battery operates in optimal condition, but when de-rating occurs, the converter cannot output the compensated voltage
Solution Approach 1:
The controller preliminarily determines whether de-rating conditions exist before applying voltage drop compensation. By detecting current limits in advance and preparing the appropriate control value (first or second), the system prevents faulty voltage compensation from being applied during de-rating conditions. This preliminary detection and preparation reduces the risk of DC-DC converter faults while maintaining battery operation efficiency during normal conditions.
3Measurement precision
If proportional controller adjusts the error between compensation voltage command and battery voltage, then voltage drop compensation accuracy is improved, but system complexity increases
Solution Approach 1:
The proportional controller implements feedback by continuously monitoring the error between the compensation voltage command and the actual battery voltage, then adjusting the control values accordingly. This feedback mechanism improves voltage drop compensation accuracy by ensuring the compensated voltage actually reaches the battery despite line resistance variations. The feedback loop, while adding some complexity, uses a simple proportional relationship that maintains practical implementability.
Data Source
AI summary
A voltage drop compensation control system and method of a power supply device are provided. The voltage drop compensation control system of the power supply device, for compensating for a voltage drop generated in an electric connection line between a direct current (DC)-DC converter and a battery includes a controller that generates a compensation voltage command that is obtained by compensating for an output voltage command of the DC-DC converter by applying a first control value for compensating for the voltage drop to the output voltage command. The controller also determines the first control value, based on an error between the compensation voltage command or an output voltage detection value of the DC-DC converter and a voltage of the battery.