Power Supply Input Selection Circuit with Logic Reset
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Solution Overview
Problem
Modern electronic devices with multiple power supply inputs face challenges in seamlessly switching between power sources during startup and mode changes, potentially leading to voltage spikes and data loss or damage due to the lack of controlled power transitions.
Innovation Solution
A power supply input selection circuit that includes a switching circuit and a logic circuit to manage power supply selection information, resetting the system to ensure safe transitions between power sources, maintaining selection information during resets, and preventing operational power to the driven circuit during switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power supply input selection circuit immediately switches from default power supply input to preferred power supply input, then the desired power mode is achieved quickly, but voltage spikes and data loss may occur due to uncontrolled power transitions
Solution Approach 1:
The logic circuit changes the power supply selection information before the actual power supply switching occurs. By pre-configuring the selection information and then resetting the circuit, the system ensures that when power switching happens, the selection is already determined, preventing uncontrolled transitions and associated hazards.
Solution Approach 2:
The reset operation serves as a protective measure that prevents voltage spikes and data loss during power supply switching. By resetting the power supply input selection circuit after changing selection information, the system cushions against potential harmful effects of improper power transitions.
2Reliability
If the power supply input selection circuit resets after changing power supply selection information, then safe power transitions are ensured, but the switching process takes longer due to the reset cycle
Solution Approach 1:
The power supply input selection circuit automatically manages its own state transitions by resetting after changing selection information. This self-service approach ensures proper sequencing without external intervention, maintaining reliability while minimizing delays through automated control.
3Duration of action of stationary object
If the driven circuit remains operational during power supply switching, then continuous operation is maintained, but the circuit may be damaged due to uncontrolled power transitions
Solution Approach 1:
The logic circuit applies preliminary anti-action by changing the power supply selection information before the actual power switching occurs. This pre-configured selection, combined with the subsequent reset, prevents harmful voltage spikes from affecting the driven circuit during power transitions.
Data Source
AI summary
A power supply input selection circuit for selecting one of a plurality of power supply inputs to supply power to a driven circuit. The power supply input selection circuit includes a power supply input switching circuit configured to provide operating power to the driven circuit by routing a selected one of the power supply inputs to the driven circuit as a function of power supply selection information; and a logic circuit configured to change the power supply selection information if a default power mode does not match a desired power mode, the logic circuit being further configured to reset the power supply input selection circuit after changing the power supply selection information, the power supply selection information being maintained during the reset, in which the power supply input switching circuit selects a desired one of the power supply inputs after the logic circuit resets the power supply input selection circuit.