Switching Circuitry Failure Detection via Load Voltage Asymmetry
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Solution Overview
Problem
Electronic devices with switching circuitry, such as dimmers, face challenges in detecting failures of components like MOSFETs, which can lead to asymmetrical waveforms and potentially catastrophic failures in inductive or magnetic loads, requiring effective detection and protection mechanisms.
Innovation Solution
Incorporating load voltage and current measuring circuitry within electronic devices to detect asymmetry and threshold current draws, using a processor to determine switching circuitry failure and control the circuitry to a fully activated state to prevent damage, thereby protecting both the device and the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switching circuitry is used to control electronic devices, then device capability and convenience are improved, but the risk of catastrophic failure in inductive or magnetic loads increases due to undetected component failures
Solution Approach 1:
The patent implements a feedback mechanism where the processor continuously monitors load voltage measurements and compares them against expected values. When a discrepancy indicating component failure is detected, the system provides feedback to control the switching circuitry to a fully activated state, preventing catastrophic load failure. This closed-loop monitoring resolves the contradiction by maintaining reliability without reducing device capability.
Solution Approach 2:
The system performs preliminary detection of component failures before they can cause catastrophic load damage. By measuring load voltage and detecting asymmetry or threshold current draws early in the failure process, the system takes preliminary protective action by controlling the switching circuitry to a safe state, thus preventing the worsening of reliability while preserving full device functionality.
2Reliability
If additional protection circuitry is added to detect switching circuitry failure, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent makes the existing processor multi-functional by adding failure detection capabilities to its existing control functions. The same processor that controls the switching circuitry also measures load voltage, analyzes measurements for failure conditions, and determines protective actions. This universal approach improves reliability without adding separate dedicated detection circuitry, thus avoiding increased device complexity.
Solution Approach 2:
The system uses its own existing resources (processor and voltage measuring circuitry) to perform failure detection and protection functions. Rather than requiring external or additional specialized protection circuitry, the system serves itself by leveraging its built-in capabilities to monitor its own health and protect against failures, thereby improving reliability without increasing overall device complexity.
Data Source
AI summary
An electronic device for detecting switching circuitry failure is described. The electronic device includes load voltage measuring circuitry configured to measure a load voltage to produce a load voltage measurement. The electronic device also includes a processor coupled to the load voltage measuring circuitry. The processor is configured to detect switching circuitry failure based on the load voltage measurement. The processor is configured to control the switching circuitry based on whether switching circuitry failure is detected.