Reset Signal Control via Current Threshold Detection
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Solution Overview
Problem
Existing reset signal control apparatuses require additional terminals for clock signal input, increasing cost and size, and struggle to stop reset signals promptly without this input.
Innovation Solution
A reset signal control apparatus with a power supply section, measuring section, and output ending section that supplies power to the microcomputer and oscillation circuit, measures consumption current, and ends the reset signal output when the current reaches a predetermined threshold, indicating clock signal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reset signal control apparatus receives the clock signal from the microcomputer to determine stabilization, then the reliability of reset control is improved, but the quantity of terminals increases and cost and size increase
Solution Approach 1:
The patent introduces a current detection circuit as an intermediary element that indirectly monitors clock signal stabilization through consumption current measurement. Instead of directly receiving the clock signal, the apparatus uses the current drawn by the oscillation circuit during startup as a proxy indicator, eliminating the need for additional clock signal terminals while maintaining reliable reset control.
Solution Approach 2:
The patent replaces the electrical signal-based clock input mechanism with a current-based detection mechanism. By substituting the direct clock signal reception (electrical signal method) with consumption current measurement (electrical parameter method), the system achieves the same control objective without requiring additional signal terminals.
2Reliability
If the reset signal output is extended to ensure microcomputer startup stability, then the reliability is improved, but the loss of time increases due to delayed reset termination
Solution Approach 1:
The patent implements a feedback mechanism where the current detection circuit continuously monitors the consumption current of the oscillation circuit and feeds this information back to the reset control circuit. When the current reaches the threshold indicating clock signal stabilization, the feedback triggers immediate reset signal termination, achieving both reliability and timely reset cessation.
Solution Approach 2:
The patent performs preliminary detection of clock signal stabilization by monitoring consumption current during the startup phase. By detecting the stabilization condition in advance through current threshold comparison, the system can proactively terminate the reset signal at the optimal moment, preventing both premature termination and excessive delay.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables prompt termination of reset signal output without delay, even without direct clock signal input, reducing terminal requirements and apparatus size.
Implementation Method 1
The measuring section measures a consumption current of the oscillation circuit and the microcomputer when the power supply section supplies the power to the oscillation circuit and the microcomputer
Data Source
AI summary
A reset signal control apparatus outputs a reset signal to a microcomputer to restrict a malfunction of the microcomputer when the microcomputer is started. The reset signal control apparatus outputs the reset signal to the microcomputer at least until a clock signal provided by an oscillation circuit and based on which the microcomputer operates is stabilized. The reset signal control apparatus includes a power supply section, a measuring section, and an output ending section. The power supply section supplies a power to the oscillation circuit and the microcomputer. The measuring section measures a consumption current of the oscillation circuit and the microcomputer. The output ending section determines that the clock signal provided by the oscillation circuit is stabilized and ends an output of the reset signal to the microcomputer when the consumption current becomes equal to or higher than a predetermined threshold value.