Flash Switch Detection Circuit Using Electromagnetic Signal Sensing

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Solution Overview

Problem

Conventional flash switch on-off detection circuits face accuracy issues due to unstable AC power grid voltage, leading to incorrect detection of state changes, especially when voltage signals are close to judgment thresholds or fluctuate.

Innovation Solution

An on-off detection circuit comprising an on-off detection module and a control module, where the detection module acquires a digital signal from an electromagnetic signal generated by the input current, allowing the control module to determine the on-off state change without signal form transformation, using components like electromagnetic transformers and power conversion modules for stable operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional voltage signal detection is used to detect flash switch on-off state, then the detection circuit can operate with simple structure, but the detection accuracy deteriorates due to unstable AC power grid voltage and signals close to judgment thresholds

Engineering Contradiction:

Improvedetection accuracyVSAvoidcircuit structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces conventional voltage signal detection with electromagnetic signal detection using an electromagnetic transformer. The detection module acquires electromagnetic signals generated by input current and converts them to detection levels, eliminating the need for voltage signal transformation and improving detection accuracy under unstable voltage conditions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the detection parameter from voltage signal to electromagnetic signal. By detecting electromagnetic signals generated by input current through the flash switch rather than voltage signals, the system achieves more stable and accurate detection that is not affected by AC power grid voltage fluctuations or threshold proximity issues.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If signal form transformation is used in detection, then the detection circuit can process voltage signals, but the detection reliability deteriorates due to additional transformation steps that may introduce errors

Engineering Contradiction:

Improvedetection reliabilityVSAvoidsignal processing complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent eliminates signal form transformation by directly detecting electromagnetic signals generated by input current. The detection module processes these electromagnetic signals to generate detection levels that directly indicate the flash switch state, removing transformation steps that could introduce errors and improving detection reliability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Loss of information

If the detection circuit stops operation when the flash switch is off, then the circuit consumes less energy, but the detection capability deteriorates as state changes cannot be monitored

Engineering Contradiction:

Improvedetection capabilityVSAvoidcircuit energy consumption

Core Design Contradiction:

Loss of informationVSUse of energy by stationary object

Solution Approach 1:

The patent enables continuous detection operation by using an electromagnetic transformer that can detect electromagnetic signals generated by input current regardless of the flash switch state. The detection module continuously processes these signals to generate detection levels, maintaining detection capability in both on and off states without requiring the circuit to stop operation.

Inventive Principle:

Principle #20Continuity of useful action

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

This approach enhances detection accuracy and reliability by directly determining state changes based on digital signals, reducing errors and maintaining circuit operation even when the flash switch is in the off state, ensuring continuous monitoring and improved overall detection effect.

Implementation Method 1

acquire a digital signal as a detection level according to an electromagnetic signal generated by input current

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS11874326B2Flash switch on-off detection circuit and electronic device

Publication Date: 2024.01.16 BEIJING XIAOMI MOBILE SOFTWARE CO LTD

AI summary

An on-off detection circuit for a flash switch includes an on-off detection module and a control module. An input end of the on-off detection module is connected with a power supply through the flash switch, the on-off detection module is configured to acquire a digital signal as a detection level according to an electromagnetic signal generated by input current. An input end of the control module is connected with an output end of the on-off detection module, to receive the detection level and determine an on-off state change of the flash switch according to the detection level.