AC/DC Conversion Verification for Ultralow-Frequency Voltage
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Solution Overview
Problem
There is a lack of methods to verify the precision and rationality of AC/DC conversion of ultralow-frequency voltage, which is crucial for ensuring the reliability of measurements in fields like vibration signal measurement and high-voltage testing, where ultralow-frequency voltage standards are essential.
Innovation Solution
A system and method utilizing quantum technology, including a quantum voltage generation system, low-frequency signal sources, switches, a double-heater-strip thermoelectric converter, nanovoltmeter, and high-precision digital sampling, to verify AC/DC conversion by comparing AC quantum voltage with thermoelectric potentials from the converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If AC/DC conversion is performed using a double-heater-strip thermoelectric converter to trace ultralow-frequency voltage to DC voltage reference, then quantity traceability is achieved, but there is no method to verify precision and rationality of the conversion
Solution Approach 1:
The patent introduces a quantum voltage standard as an intermediary reference to verify the AC/DC conversion process. The quantum voltage standard, with its inherently high accuracy and stability, serves as a mediator to compare against the thermoelectric converter's output, enabling verification of the conversion precision without directly measuring the difficult-to-verify ultralow-frequency voltage
Solution Approach 2:
The patent establishes a feedback mechanism where the quantum voltage standard provides a reference signal that is compared with the thermoelectric converter's output. This feedback loop enables continuous verification and evaluation of the AC/DC conversion accuracy, allowing for uncertainty evaluation and precision verification
2Measurement precision
If ultralow-frequency voltage is used instead of power frequency voltage in high-voltage testing, then testing accuracy is improved, but measurement reliability cannot be ensured without verification methods
Solution Approach 1:
The quantum voltage standard acts as an intermediary verification tool that bridges the gap between the ultralow-frequency voltage measurement system and the ultimate reference standard. It provides a reliable reference point to verify that the ultralow-frequency voltage measurements used in high-voltage testing are accurate and reliable
3Adaptability or versatility
If AC/DC conversion is performed for vibration signal measurement, then measurement capability is expanded, but uncertainty evaluation cannot be verified
Solution Approach 1:
The patent implements a feedback verification system where the quantum voltage standard continuously monitors and verifies the AC/DC conversion process. This feedback mechanism enables the system to evaluate and verify uncertainty measurements, ensuring that the expanded measurement capability maintains high precision and 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
Enables reliable verification of AC/DC conversion results, ensuring the accuracy and reliability of ultralow-frequency voltage measurements, thereby improving the precision of vibration signal and high-voltage testing.
Implementation Method 1
The quantity traceability of the ultralow-frequency voltage is realized through AC/DC conversion by using a double-heater-strip thermoelectric converter as a reference standard
Implementation Method 2
The Programmable Josephson Voltage Standard (PJVS) with high amplitude accuracy has been successfully synthesized
Data Source
AI summary
The present disclosure provides a system and method for verifying alternating current (AC)/direct current (DC) conversion of an ultralow-frequency voltage. The system includes a quantum voltage generation system, a low-frequency signal source, a follower, three switches, a double-heater-strip thermoelectric converter, a nanovoltmeter, a clock source, a high-precision digital sampling system, and an upper computer. Based on DC and AC quantum voltage technologies and with reference to the double-heater-strip thermoelectric converter, an ultralow-frequency voltage is traced to a DC quantum voltage through AC/DC conversion, and a conversion result is compared with an AC quantum voltage to verify rationality of precision and an uncertainty evaluation result of AC/DC conversion of the ultralow-frequency voltage, so as to ensure reliability of AC/DC conversion of the ultralow-frequency voltage. This resolves a problem that the AC/DC conversion result of the ultralow-frequency voltage cannot be verified.