Variable Reference Voltage Source Using Integration-Based Self-Calibration
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Solution Overview
Problem
Conventional variable reference voltage sources require external measuring instruments for calibration, which is inconvenient and inefficient.
Innovation Solution
A variable reference voltage source with an integrated calibration control unit and output control unit that generates a variable reference voltage without the need for external calibration instruments, using an integrated-voltage generating unit to adjust the voltage internally based on setting data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional variable signal sources (R-2R ladder circuit, resistance string circuit, PWM circuit) are used to output a known voltage, then the signal source can provide calibration voltage, but external measuring instruments are required for calibration and adjustment
Solution Approach 1:
The patent merges the calibration function into the variable reference voltage source itself by integrating a calibration control unit that uses an integrating circuit to generate accurate voltage values. This eliminates the need for external measuring instruments and combines what were previously separate functions (voltage generation and calibration) into a single integrated device.
Solution Approach 2:
The variable reference voltage source performs self-calibration through its internal calibration control unit and integrating circuit. The system automatically generates accurate voltage values without requiring external intervention or measurement instruments, making the device self-sufficient for calibration purposes.
2Measurement precision
If R-2R ladder circuit or resistance string circuit is used, then high-resolution variable signal source can be configured, but external measuring instrument is needed for fine adjustment of resistance element
Solution Approach 1:
The system automatically maintains accuracy through internal calibration using the integrating circuit, eliminating the need for manual fine adjustment of resistance elements. The calibration control unit handles all adjustments automatically, making the high-resolution signal source easy to operate without requiring external measurement instruments or manual calibration.
3Stability of the object's composition
If PWM circuit is used, then performance stability is achieved with digital circuit configuration, but external measuring instrument is needed for frequency accuracy adjustment of low-pass filter
Solution Approach 1:
The patent combines the frequency adjustment function for the low-pass filter into the calibration control unit. The integrating circuit works in conjunction with the PWM circuit to automatically maintain frequency accuracy, eliminating the need for external measuring instruments while preserving the performance stability of the digital circuit configuration.
4Measurement precision
If external measuring instrument is prepared for calibration, then accurate calibration can be performed, but work for preparing and adjusting the reference signal source is essential
Solution Approach 1:
The variable reference voltage source performs self-calibration automatically using its internal calibration control unit and integrating circuit. This eliminates the time-consuming process of preparing external measuring instruments and manually adjusting the reference signal source, while maintaining calibration accuracy through the automated internal calibration process.
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
Enables self-calibration of the voltage source, eliminating the need for external instruments and ensuring accurate voltage output without external calibration.
Implementation Method 1
an integrated-voltage generating unit that repeats, when the calibration control unit controls the operation, an integrating operation until an integrated voltage obtained by integrating the predetermined unit voltage becomes equal to the reference voltage
Data Source
AI summary
To provide a variable reference voltage source for which a measuring instrument is unnecessary for calibration on the outside. A variable reference voltage source that generates a variable reference voltage corresponding to setting data set from outside includes a control unit including a calibration control unit that controls operation for calibrating an offset and a predetermined unit voltage inside the variable reference voltage source and an output control unit that controls operation for outputting the variable reference voltage, a reference voltage unit that outputs a reference voltage Vref, and an integrated-voltage generating unit that repeats, when the calibration control unit controls the operation, an integrating operation until an integrated voltage obtained by integrating the predetermined unit voltage becomes equal to the reference voltage Vref and outputs, when the output control unit controls the operation, the variable reference voltage corresponding to the setting data.