Low Voltage DC-DC Converter Output Voltage Sensing Error Correction
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Solution Overview
Problem
Low voltage DC-DC converters face challenges in achieving accurate output voltage control due to sensing errors, particularly in analog control systems, where hardware adjustments are costly and difficult to implement, and stringent control standards for environmentally friendly vehicles require improved accuracy.
Innovation Solution
A method that applies test voltages to the output of the DC-DC converter, senses these voltages, and adjusts the voltage reference map using linear interpolation to correct sensing errors, allowing for improved control accuracy without modifying the hardware of the voltage sensing circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hardware of the output voltage sensing circuit is adjusted to a new sensing circuit having a minimal resistance error, then sensing accuracy is improved, but costs increase
Solution Approach 1:
The patent changes the parameters (scale and offset values) of the existing voltage sensing circuit through software calibration rather than hardware modification. By applying correction values to the sensing circuit parameters, the system achieves improved sensing accuracy without replacing hardware components, thereby avoiding increased costs while maintaining measurement precision
Solution Approach 2:
The patent creates a virtual copy or model of the ideal sensing behavior through calibration data. Instead of physically replacing the sensing circuit with a perfect one, the system uses correction algorithms that replicate the effect of having an accurate sensing circuit, achieving the same result at lower cost
2Measurement precision
If resistance error in a circuit for sensing the output voltage is corrected, then sensing accuracy is improved, but hardware must be adjusted which increases costs
Solution Approach 1:
The patent replaces the mechanical/hardware approach to correcting resistance errors with a software-based solution. Instead of physically adjusting resistors or replacing sensing components, the system uses digital calibration algorithms that compute and apply correction values, substituting electronic/software methods for mechanical hardware adjustments
Solution Approach 2:
The patent introduces an intermediary calibration process between the voltage sensing circuit and the control system. This intermediary layer computes correction values based on known reference voltages and applies them to compensate for sensing errors, acting as a mediator that eliminates the need for direct hardware modification
3Measurement precision
If control accuracy of output voltage is improved, then LDC control accuracy is enhanced, but hardware modification is required which increases costs
Solution Approach 1:
The patent performs preliminary calibration action during system initialization or setup phase. By pre-computing correction values for scale and offset errors using known reference voltages, the system prepares the necessary correction data before actual operation begins, enabling accurate control without requiring expensive hardware modifications during production or operation
Solution Approach 2:
The patent implements a feedback mechanism where the system compares sensed voltages against known reference values and uses the difference to determine correction values. This feedback loop enables the system to automatically adjust its sensing parameters to achieve accurate control, improving LDC control accuracy through intelligent software-based feedback rather than hardware changes
Data Source
AI summary
A method of adjusting an output voltage sensing error of a low voltage DC-DC converter to adjust a difference between a value obtained by sensing an output voltage of a low voltage DC-DC converter and a reference value controlling the low voltage DC-DC converter, thereby improving control accuracy is provided. The method of correcting an output voltage sensing error of a low voltage DC-DC converter includes applying a test voltage to an output of the LDC by voltage application equipment, sensing a voltage of the output of the LDC by a voltage sensing circuit and adjusting by a controller a voltage reference map included in an LDC controller that outputs a voltage reference value of the LDC, based on an error between the test voltage and a voltage sensing value sensed by the voltage sensing circuit.