ADC Reference Error Compensation Using MCU Supply Voltage

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Solution Overview

Problem

In electronic control systems of electric vehicles, ADCs often experience errors due to reference voltage errors, leading to sensing errors that can compromise system reliability and safety.

Innovation Solution

An ADC error compensation control device and method that utilize the MCU's supply voltage (VDD or Vcore) to calculate an error compensation value, which is then used to correct sensing voltage errors, thereby reducing overall sensing errors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If ADC reference voltage is used for sensing, then voltage and current can be converted to digital signals, but sensing errors occur when reference voltage has errors

Engineering Contradiction:

Improvesensing accuracyVSAvoidsystem reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent introduces MCU supply voltage (VDD/Vcore) as an intermediary reference to compensate for ADC reference voltage errors. By using the MCU supply voltage as a stable reference and calculating compensation values, the system mediates between the unstable ADC reference voltage and the digital conversion process, thereby improving sensing accuracy and reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the reference voltage parameter from the unstable ADC reference voltage to the stable MCU supply voltage for compensation calculations. By dynamically adjusting and compensating based on the MCU supply voltage parameter, the system maintains accurate sensing even when ADC reference voltage fluctuates

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If ADC reference voltage errors occur, then sensing voltage errors increase, but using alternative reference voltages may introduce new errors

Engineering Contradiction:

Improvevoltage sensing precisionVSAvoidsensing voltage error

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the MCU supply voltage is continuously monitored and used to calculate compensation values. This feedback loop compensates for ADC reference voltage errors in real-time, reducing sensing voltage errors while maintaining measurement precision

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent converts the harmful effect of ADC reference voltage errors into a benefit by using the MCU supply voltage as a compensation reference. The errors in ADC reference voltage are transformed into compensatable deviations, which are then corrected through calculation based on the stable MCU supply voltage

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS12323157B2ADC error compensation control device and control method therefor

Publication Date: 2025.06.03 HL MANDO CORP

AI summary

An ADC error compensation control device according to an embodiment of the present invention includes an ADC module configured to calculate a first result value using a sensed input voltage Vin and an input reference voltage Vref, and calculate a second result value using an input MCU supply voltage and the input reference voltage Vref, an error compensation unit configured to calculate an error compensation value on the basis of the second result value calculated by the ADC module, the MCU supply voltage, and a steady state value of the reference voltage Vref, and a logic unit configured to perform conversion to a real value on the basis of the first result value and the error compensation value.