Decentralized Power Supply Voltage Detection Accuracy
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Solution Overview
Problem
Existing decentralized power supply systems face challenges in accurately detecting the degradation of detection accuracy for system power supply voltage due to variations in reference voltages and abnormal conditions, which can lead to decreased detection accuracy.
Innovation Solution
The system employs two independent analog-to-digital converter systems with separate reference voltages to compare output values, allowing for secure detection of detection accuracy degradation by determining if output values match or differ within predetermined ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single analog-to-digital converter is used to detect system power supply voltage, then the device complexity is reduced, but the detection accuracy and reliability deteriorate when reference voltage varies or abnormalities occur
Solution Approach 1:
The voltage detection system is segmented into two independent detection paths, each with its own analog-to-digital converter and reference voltage. This segmentation allows the system to detect voltage through multiple independent channels, improving reliability and accuracy without requiring a single complex converter system.
Solution Approach 2:
A second analog-to-digital converter and reference voltage system is created as a copy of the first, providing redundant detection capability. The comparison between the two independent detection results enables verification of detection accuracy and identification of abnormalities in either converter or reference voltage.
2Device complexity
If reference voltage is shared between converters, then the system is simplified, but detection accuracy degrades when reference voltage varies due to abnormalities
Solution Approach 1:
The reference voltage system is segmented into two independent reference voltage sources, one for each analog-to-digital converter. This independence ensures that variations or abnormalities in one reference voltage do not affect the other detection channel, maintaining reliable detection even when one reference voltage becomes abnormal.
Solution Approach 2:
A second independent reference voltage is created as a copy of the first, providing redundant reference for the second converter. By comparing results from both independent reference systems, the detection reliability is enhanced and abnormalities in either reference voltage can be identified.
3Measurement precision
If dual independent converter systems are implemented, then detection accuracy and reliability improve, but the device complexity increases
Solution Approach 1:
The system implements feedback by comparing the detection results from both independent converter paths. The comparison unit continuously monitors the consistency between the two detection results, and when discrepancies exceed a threshold, it triggers abnormality detection. This feedback mechanism enables the system to maintain high detection accuracy while managing complexity through intelligent comparison rather than complete redundancy of processing functions.
Data Source
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AI summary
A decentralized power supply system includes a power generation device (11), an alternatingcurrent system power supply (20), plural electric wires (21, 22, 24), an inverter (13), a normally-open type switch (15, 15a, 15b), a system voltage detection circuit (31), and a control unit (16). The control unit (16) includes a first A/D converter (16a) to which a first reference voltage (Vref1) and a first output outputted from the system voltage detection circuit (31) are inputted, a second A/D converter (16b) to which a second reference voltage (Vref2) and a second output outputted from the system voltage detection circuit (31) are inputted, a comparison portion (16c) comparing an output from the first A/D converter (16a) with an output from the second A/D converter (16b), and a detection accuracy determination portion (16d) determining a detection accuracy of the voltage of the system power supply (20) based on a comparison result.