Power Switch Shutdown Diagnosis Using Motor Back-EMF
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Solution Overview
Problem
Existing diagnostic methods for power switch failures in power supply systems, particularly in systems with rotating motors, are complicated by the need to control inverters to counteract back EMF, leading to complex configurations and potential inaccuracies in failure diagnosis.
Innovation Solution
A diagnostic device and program that diagnoses power switch failures by outputting a shutdown command to the power switch with inverter control stopped, monitoring voltage changes relative to motor revolutions, and optionally discharging smoothing capacitors to stabilize the path voltage, allowing for accurate failure diagnosis without inverter control-induced voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple tests are performed manually in a hospital laboratory, then diagnostic accuracy is improved, but examination time is extended and patient burden increases
Solution Approach 1:
The patent combines multiple independent diagnostic tests (urine albumin, creatinine, eGFR calculations) into a single integrated examination system. The image reader simultaneously captures images of multiple test papers and processes them through unified control software, enabling parallel execution of multiple diagnostic functions that would otherwise require separate manual testing procedures.
Solution Approach 2:
The system performs preliminary data processing and eGFR calculations automatically during the image reading phase, before clinical interpretation is needed. By pre-calculating derived parameters like eGFR from the captured test results, the system eliminates the need for manual computation and prepares comprehensive diagnostic data in advance for immediate clinical use.
2Adaptability or versatility
If multiple tests are performed manually, then diagnostic comprehensiveness is improved, but operational complexity increases
Solution Approach 1:
The image reader is designed as a universal platform capable of reading multiple types of diagnostic test papers (urine dipsticks, albumin tests, creatinine tests, etc.) through a single device. The control unit automatically identifies test types and applies appropriate processing algorithms, eliminating the need for separate specialized equipment for each diagnostic test.
Solution Approach 2:
The system performs automatic test paper identification, result extraction, and eGFR calculation without requiring manual intervention for each test type. The control unit autonomously processes different test formats and formats results in a standardized manner, reducing operational complexity while maintaining diagnostic comprehensiveness.
3Measurement precision
If eGFR is calculated manually from creatinine results, then diagnostic precision is improved, but time consumption and operational burden increase
Solution Approach 1:
The patent replaces manual calculation methods with automated computational processing. The control unit automatically retrieves creatinine results from captured test images, applies the appropriate eGFR calculation formula (such as CKD-EPI or MDRD), and generates the eGFR value electronically, eliminating manual arithmetic operations while maintaining calculation precision.
Solution Approach 2:
The eGFR calculation is performed continuously and automatically as part of the overall test processing workflow. Rather than being a separate manual step, the calculation is integrated into the automated image reading and data processing sequence, ensuring continuous diagnostic data generation without interruption to examination throughput.
Data Source
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AI summary
A diagnostic device includes: a shutdown command unit that outputs a shutdown command to shut down a power switch with the control of an inverter stopped when a switch diagnostic condition is satisfied in the conduction state of the power switch, an acquisition unit that acquires a voltage change, which is the change in the detected voltage of a voltage sensor in response to the change in the number of revolutions of the motor after the output of the shutdown command by the shutdown command unit, and a diagnostic unit that diagnoses whether the power switch is in an on-failure state based on the voltage change.