UPS Bypass Circuit Test Mode for Inverter Fault Readiness
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Solution Overview
Problem
In power supply apparatuses, a fault in the bypass circuit during the first power feeding mode can cause the load to stop operating, as the bypass circuit fails to conduct when the inverter malfunctions.
Innovation Solution
A power supply apparatus with a controller that performs a third power feeding mode to determine the normal operation of the bypass circuit by monitoring output voltage from the inverter, allowing for repair or replacement of the bypass circuit when it is not functioning properly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bypass circuit is not tested during the first power feeding mode, then the system operates continuously without interruption, but the bypass circuit may fail undetected causing load operation to stop when inverter fault occurs
Solution Approach 1:
The controller performs a test mode before normal operation to detect bypass circuit faults in advance. By bringing the bypass circuit into conduction during the test mode and monitoring output voltage, the system identifies potential failures before they affect load operation, ensuring the bypass circuit is ready for emergency use.
Solution Approach 2:
The controller periodically switches between test mode and first power feeding mode. During the test mode, the bypass circuit is tested by bringing it into conduction and monitoring output voltage. This periodic testing ensures the bypass circuit remains functional without continuously interrupting power supply to the load.
2Reliability
If the bypass circuit is brought into conduction during test mode, then the bypass circuit can be tested for normal operation, but the inverter output voltage may be affected during testing
Solution Approach 1:
The controller monitors the output voltage from the inverter during the test mode to determine whether the bypass circuit operates normally. By using the inverter's own output voltage as a reference and comparing it against expected values, the system accurately assesses bypass circuit functionality while accounting for any voltage variations during testing.
Data Source
AI summary
A controller of this uninterruptible power supply apparatus performs, while an inverter power feeding mode is being performed, a test mode in which a bypass circuit is brought into conduction and an output current from an inverter is decreased, and it is determined whether or not the bypass circuit operates normally based on an output voltage from the inverter. Therefore, when the bypass circuit does not operate normally, the bypass circuit can be repaired or replaced, to prevent operation of a load from being stopped when a fault occurs in the inverter.