Voltage Converter Sensor Error Offset Correction
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Solution Overview
Problem
Voltage converters with two sensors for feedback control and overvoltage monitoring can incorrectly execute an error process due to the accumulation of measurement errors, leading to false determinations of output voltage exceeding the voltage upper limit, even when the actual output voltage remains within safe limits.
Innovation Solution
A voltage converter configuration that includes a controller capable of correcting the target voltage by subtracting an offset voltage from the original target voltage when the second voltage sensor's measurement approaches the voltage upper limit, preventing the error process by ensuring the actual output voltage does not exceed the limit due to measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two voltage sensors are used for feedback control and overvoltage monitoring, then reliability is improved, but measurement errors accumulate causing false overvoltage detection
Solution Approach 1:
The patent changes the parameter of target voltage to a corrected target voltage by subtracting an offset voltage from the original target voltage. This parameter change compensates for the accumulated measurement errors between the two voltage sensors, preventing false overvoltage detection while maintaining reliable overvoltage monitoring functionality.
Solution Approach 2:
The patent performs preliminary correction of the target voltage by subtracting the offset voltage before using it for feedback control. This preliminary action anticipates and compensates for the measurement error accumulation, ensuring that the actual output voltage remains below the voltage upper limit even when both sensors have maximum positive errors.
2Productivity
If target voltage is maintained at original value, then feedback control performance is optimized, but actual output voltage may exceed voltage upper limit due to sensor errors
Solution Approach 1:
The patent applies preliminary anti-action by subtracting an offset voltage from the target voltage to counteract the potential harmful effect of measurement error accumulation. This corrective action is taken in advance to prevent the actual output voltage from exceeding the voltage upper limit, while the feedback control continues to operate effectively around the corrected target voltage.
Data Source
AI summary
A voltage converter may include a first voltage sensor and a second voltage sensor both configured to measure an output voltage of a voltage converter circuit and a controller configured to execute a feedback control for the voltage converter circuit such that a voltage difference between a target voltage and a measured value of the first voltage sensor becomes zero and configured to execute a predetermined error process in a case where a measured value of the second voltage sensor exceeds a predetermined voltage upper limit value. The controller may execute the feedback control such that a voltage difference between a correction target voltage and the measured value of the first voltage sensor becomes zero while the measured value of the second voltage sensor exceeds a voltage threshold which is less than the voltage upper limit value.