Brown-out Detector Time Sequence Control
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Solution Overview
Problem
Conventional brown-out detection circuits are overly sensitive to power supply noise and interference, leading to weak anti-noise and anti-interference capabilities, especially when the power supply voltage is close to the threshold.
Innovation Solution
A brown-out detection circuit with a time sequence control function, incorporating a voltage divider, reference voltage source, comparator, and time sequence control module, where the output is only inverted from high to low if the power supply voltage remains below the reference voltage for a preset time, enhancing noise and interference resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional BOD is used with immediate response to voltage threshold, then the detection speed is fast, but the anti-noise ability and anti-interference ability are weak
Solution Approach 1:
The patent applies preliminary action by introducing a time sequence control module that requires the voltage to remain below the threshold for a preset duration before triggering the brown-out output. This preliminary time check filters out transient noise and interference that would otherwise cause false triggering, thereby improving anti-noise ability while maintaining acceptable response time for genuine brown-out conditions
2Measurement precision
If the threshold Vth is set close to the power supply voltage Vcc, then the detection precision is high, but the sensitivity to noise and interference increases
Solution Approach 1:
The patent introduces a time sequence control module as an intermediary between the comparator output and the brown-out detection output. This intermediary filters out transient voltage fluctuations and noise by requiring the condition to persist for a preset time duration, thereby reducing noise sensitivity while maintaining the ability to detect genuine brown-out events with high precision
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
The circuit effectively suppresses false triggering due to short-duration noise and interference, thereby enhancing its anti-noise and anti-interference abilities.
Implementation Method 1
a voltage divider, one terminal of the voltage divider is connected to an external power supply
Implementation Method 2
a comparator and a time sequence control module; wherein one terminal of the voltage divider is connected to an external power supply, the other terminal of the voltage divider is connected to a positive input of the comparator, the reference voltage source is connected to an inverted input of the comparator
Data Source
AI summary
A brown-out detection circuit having a time sequence control function comprises: a voltage divider (110), a reference voltage source (120), a comparator (130) and a time sequence control module (140); wherein one terminal of the voltage divider (110) is connected to an external power supply, the other terminal of the voltage divider (110) is connected to a positive input of the comparator (130), the reference voltage source (120) is connected to an inverted input of the comparator (130), the time sequence control module (140) is connected to an output of the comparator (130), an output of the time sequence control module (140) serves as an output of the brown-out detection circuit; when a duration of a power supply voltage lower than a reference voltage is not shorter than a preset time, the time sequence control module (140) controls the output of the brown-out detection circuit to be inverted from a high level to a low level.