Power-Off Detection Circuit for Voltage Drop Speed Estimation
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Solution Overview
Problem
Electronic devices malfunction when operation voltage suddenly drops, leading to data loss or improper functioning.
Innovation Solution
A control method and circuit that estimate the power-off speed of an operation voltage by detecting and calculating slopes based on detection values, allowing for timely update or reset operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the operation voltage is monitored continuously to detect sudden drops, then the reliability of device operation is improved, but the complexity of the control circuit increases
Solution Approach 1:
The voltage detection range is segmented into multiple detection values (first detection value, second detection value, etc.), allowing the system to monitor voltage drops at different thresholds. This segmentation enables reliable detection of sudden voltage drops while keeping the control circuit manageable by dividing the monitoring task into discrete voltage levels rather than continuous monitoring.
Solution Approach 2:
The patent introduces intermediate detection values as mediators between the normal operation voltage and the reset voltage. These intermediate values serve as early warning signals that allow the system to prepare for potential voltage drops before they reach critical levels, improving reliability without requiring direct monitoring of every voltage fluctuation.
2Measurement precision
If multiple detection values and count values are calculated to estimate power-off speed, then the precision of power-off speed estimation is improved, but the calculation complexity increases
Solution Approach 1:
The system performs preliminary calculations by establishing multiple detection values and their corresponding count values in advance. By pre-defining these reference points, the actual power-off speed estimation requires only comparing current voltage conditions against these pre-established values, reducing real-time calculation complexity while maintaining high precision through the multiple reference points.
Solution Approach 2:
The patent changes parameters by using multiple detection values (V1, V2, etc.) and their corresponding count values (CT1, CT2, etc.) to represent different voltage states. By transforming the continuous voltage drop measurement into discrete parameter comparisons, the system achieves precise power-off speed estimation while simplifying the calculation process to straightforward parameter matching and comparison operations.
Data Source
AI summary
A control method executing a power-off detection operation is provided. An operation voltage provided by a power circuit is detected. In response to the operation voltage being equal to the first detection value, the count value is adjusted. In response to the operation voltage being equal to the second detection value, the first detection value, the second detection value, and the count value are calculated to generate a first slope. A first power-off speed at which the operation voltage drops to the reset voltage is estimated according to the first slope. In a test mode, the first power-off speed is output to a test machine. The test machine determines whether the power circuit is working normally according to the first power-off speed.