Redundant Power Supply Circuit Switching for Uneven Load Failure Detection
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Solution Overview
Problem
Existing redundant power supply systems may fail to provide consistent backup power to all loads due to varying failure determinations of the main power supply across different loads, leading to incomplete or unsafe vehicle operations during backup control.
Innovation Solution
A redundant power supply system with a control unit that operates the first circuit when no failure is detected and switches to the second circuit when a failure is detected by one load but not another, ensuring all loads receive power by prioritizing the sub power supply once a voltage threshold is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backup control is started based on failure determination by at least one load, then safety of the vehicle is improved, but some loads that do not detect failure may not execute required movements
Solution Approach 1:
The system segments the power supply control into two independent circuits: a first circuit for normal operation connected to the main power supply, and a second circuit for backup operation connected to the sub power supply. Each circuit can be independently controlled based on failure detection results from different loads, allowing selective activation of backup power for specific loads that require it.
Solution Approach 2:
The control unit dynamically switches between normal control mode (first circuit operating) and backup control mode (second circuit operating) based on real-time failure detection status. The system transitions from a static power supply configuration to a dynamic one where the operational state of each circuit can change according to the specific needs of different loads.
2Ease of operation
If the sub power supply voltage drops to lower limit voltage, then the first circuit can be reactivated for loads that need it, but the sub power supply may not have sufficient capacity for all loads
Solution Approach 1:
The system performs preliminary action by having the second circuit (sub power supply) operate in advance to maintain voltage within acceptable ranges before the main power supply is fully restored. This preliminary operation ensures that loads requiring backup power receive sufficient voltage during the transition period, preventing operational failures while the main power supply recovers or is reconnected.
Solution Approach 2:
The control unit ensures continuous useful action by monitoring sub power supply voltage and maintaining its operation until voltage reaches the lower limit. This continuous operation guarantees that loads connected to the second circuit receive uninterrupted power during the backup period, while the system prepares for seamless transition back to normal operation when voltage conditions are met.
Data Source
AI summary
A redundant power supply system comprising: a sub power supply; a first circuit; a second circuit for supplying power of the sub power supply to the plurality of loads; and a control unit for controlling operations of the first circuit and the second circuit based on a state of the main power supply, wherein the control unit operates only the first circuit when there is no failure notification of the main power supply from the plurality of loads, and when there is no failure notification of the main power supply from the first load, and when there is a failure notification of the main power supply from the second load, which is one of the plurality of loads, operates only the second circuit, and then operates the first circuit when the voltage of the sub power supply decreases to a predetermined lower limit voltage.