Power Supply Offset Correction Circuit for ADC Voltage Detection
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Solution Overview
Problem
Power supply systems face precision control challenges due to input offset errors caused by analog-to-digital converters, leading to inaccuracies in voltage detection and control.
Innovation Solution
An offset correction circuit that equally divides the input voltage into n parts and uses an ADC to detect these divided voltages, determining the difference as an offset correction value, and a voltage correction circuit that adjusts the reference voltage based on specific ratios to correct for errors, ensuring accurate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an analog-to-digital converter (ADC) is used to detect analog voltage values for control, then the control apparatus can perform voltage detection and control operations, but input offset errors occur leading to inaccuracies in detected values
Solution Approach 1:
The patent applies preliminary action by performing offset correction before the main voltage detection operation. The control apparatus first detects an offset value using a predetermined offset correction voltage, then uses this offset value to correct subsequent voltage measurements. This preliminary correction action eliminates the harmful offset effect that would otherwise degrade measurement precision.
Solution Approach 2:
The patent converts the harmful offset error into a useful correction mechanism. By deliberately applying a known offset correction voltage and measuring the resulting offset value, the system transforms the ADC's inherent offset error (harmful factor) into a quantifiable parameter that can be used to correct future measurements (beneficial effect).
2Adaptability or versatility
If external voltage signals are detected for control purposes, then the control apparatus can monitor and respond to external conditions, but offset errors in detection lead to control difficulties
Solution Approach 1:
The patent implements feedback by continuously monitoring the relationship between input voltages and detected values, calculating offset values, and applying corrections to subsequent measurements. The control apparatus uses the detected offset information to adjust and improve the accuracy of external voltage signal detection, creating a closed-loop system that enhances reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively corrects offset errors in power supply systems, enhancing precision control by accurately detecting input voltages and improving the reliability of power supply operations.
Implementation Method 1
an offset correction circuit equally dividing an input voltage into n (n is a natural number larger than 2) and outputting n divided voltages
Implementation Method 2
a control unit using an analog-to-digital converter (ADC) to detect the n divided voltages output from the offset correction circuit
Data Source
AI summary
There are provided an apparatus for and a method of controlling a power supply system. The apparatus for controlling a power supply system includes an offset correction circuit equally dividing an input voltage into n (n is a natural number larger than 2) and outputting n divided voltages, and a control unit using an analog-to-digital converter (ADC) to detect the n divided voltages output from the offset correction circuit, and determining a difference in levels between a value of the detected n divided voltages and a value calculated by dividing the input voltage by n, as an offset correction value.