Power State Signal Circuit for Fast Control Resume Decisions
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Solution Overview
Problem
Existing electronic apparatuses face challenges in quickly determining whether to resume power supply to the control portion after power failures, requiring time-consuming processes to read stored state information.
Innovation Solution
An electronic apparatus with a signal output circuit and determination processing portion that uses a secondary power source to quickly determine power supply to the control portion based on digital signal levels, eliminating the need for reading stored state information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control portion reads stored state information to determine whether to resume power supply after power failures, then the determination accuracy is improved, but the time required for resuming operations increases
Solution Approach 1:
The signal output circuit continuously outputs a digital signal indicating the power supply state before power failures occur. This preliminary action ensures that when power is restored, the control portion can immediately determine whether to resume operations without needing to read stored state information, thus resolving the contradiction between determination accuracy and resume time
Solution Approach 2:
A digital signal acts as an intermediary between the power supply state and the control portion's decision-making process. The signal output circuit generates and maintains this digital signal even during power failures, allowing the control portion to quickly determine the pre-failure state upon power restoration, eliminating the need for time-consuming data reading while maintaining accurate determination
Data Source
AI summary
An electronic apparatus includes a control portion, a signal output circuit, a switching processing portion, and a determination processing portion. The control portion switches on or off power supply from the primary power source in response to detection of an operation on a power switch. The signal output circuit outputs a preset digital signal. The switching processing portion switches a signal level of the digital signal when a power supply state of the control portion is switched. The determination processing portion determines whether or not to execute power supply to the control portion based on the signal level of the digital signal output by the signal output circuit when power supply from an external power source to the primary power source is started.