Backup Power Supply Control Using Low-Load Inspection Switching
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Solution Overview
Problem
In power supply systems, there is no effective method to quickly inspect and execute backup control, leading to prolonged downtime until the power supply is recharged after inspection, as the inspection process drains the power storage capacity of the secondary power system.
Innovation Solution
A power supply control apparatus with a first and second power system, load switches, and a control unit that detects ground faults and switches power to execute backup control using the second power supply, allowing for inspection of the third load with lower power consumption to determine the feasibility of backup control without depleting the secondary power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control unit connects the load switch corresponding to the second load for inspection, then the inspection of backup control capability is completed, but the power storage capacity of the second power supply decreases significantly, causing long recharge time
Solution Approach 1:
Instead of connecting the load switch for the second load (which has large power consumption) during inspection, the control unit connects the load switch for the third load (which has small power consumption). This partial action approach allows the inspection to proceed with minimal impact on the second power supply's charge level, thereby avoiding long recharge times while still verifying backup control capability.
2Loss of time
If the control unit connects the load switch corresponding to the third load for inspection, then the power storage capacity of the second power supply is preserved, but the inspection may not fully represent the backup control capability under high power demand
Solution Approach 1:
The control unit performs preliminary inspection using the third load with small power consumption to quickly assess backup control capability. This preliminary action provides sufficient information to determine whether the second power supply can handle backup operations without depleting its charge, thereby avoiding the need for lengthy recharge cycles while maintaining adequate inspection accuracy.
Data Source
AI summary
A power supply control apparatus includes: a first system capable of supplying electric power from a first power supply to a first load; a second system capable of supplying electric power from a second power supply to a load group including a second load and a third load having consumed electric power smaller than that of the second load; a plurality of load switches as defined herein; and a control unit configured to control the load switches so that backup control performed by the second system is executed by the electric power supply from the second power supply, in a case where an occurrence of a ground fault in the first system is detected, and when the control unit inspects as to whether the backup control can be executed, the control unit connects the load switch corresponding to the third load of the load group to execute the inspection.