MOS Switching Circuit Control for Multi-Fault Protection
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Solution Overview
Problem
Existing large-current control systems fail to simultaneously protect against high-temperature faults, reverse connection, and short-circuits during the operation of MOS transistors.
Innovation Solution
A large-current MOS drive control method utilizing a single-chip microcomputer with a detection module comprising an ammeter, voltmeter, multimeter, and infrared thermometer to monitor and control the MOS switching circuit, along with a display module for fault indication, ensuring safe operation by managing current, voltage, and temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a MOS transistor is used for switch control due to its low on-resistance and voltage-driven characteristics, then switching efficiency is improved, but the system cannot simultaneously protect against multiple high-temperature faults such as turn-on, turn-off, reverse connection, and short-circuit
Solution Approach 1:
The control system is segmented into multiple independent detection modules, each responsible for detecting specific fault conditions (turn-on fault, turn-off fault, reverse connection, short-circuit). This segmentation allows the system to maintain high switching efficiency while providing comprehensive protection against multiple fault types through parallel detection channels.
Solution Approach 2:
A single-chip microcomputer is introduced as an intermediary between the MOS transistor switching circuit and the fault detection system. The microcomputer coordinates multiple detection modules and implements centralized control, enabling simultaneous protection against multiple high-temperature faults while maintaining the voltage-driven efficiency of MOS transistors.
2Reliability
If multiple detection devices are added to monitor current, voltage, polarity, and temperature, then fault protection capability is improved, but device complexity increases
Solution Approach 1:
The single-chip microcomputer serves as a universal control platform that integrates multiple detection functions (current monitoring, voltage detection, polarity identification, temperature sensing) into a single centralized system. This multi-functionality approach improves fault detection capability while avoiding the complexity of multiple independent control circuits.
Solution Approach 2:
Multiple detection devices (ammeter, voltmeter, multimeter, infrared thermometer) are merged into a unified detection system coordinated by the single-chip microcomputer. The detection modules are integrated under centralized control, combining their functions to provide comprehensive fault protection without the complexity of separate independent systems.
3Reliability
If real-time monitoring of current, voltage, and temperature is implemented, then operational safety is improved, but energy consumption increases
Solution Approach 1:
The detection devices monitor current, voltage, and temperature parameters at periodic intervals rather than continuously. The single-chip microcomputer implements time-multiplexed detection, sampling parameters at optimized intervals to ensure operational safety while minimizing energy consumption of the monitoring system.
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 method effectively protects against high-temperature faults, reverse connections, and short-circuits, enhancing the safety and stability of large-current driving circuits by real-time monitoring and adjustment, ensuring safe operation and maintenance.
Implementation Method 1
the infrared thermometer monitors the temperature of the key connection points in the switching circuit
Data Source
AI summary
A large-current MOS drive control method, comprising the following steps: 1) turning on a device, initializing the device, activating an MOS switching circuit, and completing a turn-on operation for the circuit; 2) monitoring the voltage connected to the switching circuit, connecting the switching circuit to a power supply after voltage detection, and activating the power supply; 3) connecting the power supply to a control circuit, processing, by the control circuit, information transmitted by the power supply, and driving, by the control circuit, a driving circuit; and 4) after the MOS switching circuit is connected, measuring the temperature of the switching circuit in real time by means of an infrared temperature measurement instrument, and if the temperature exceeds 80 Celsius degrees, giving an alarm by flashing a red alarm lamp.