Motor Control Input-Line Fault Detection Using a MOSFET Sensing Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor control systems face challenges in accurately detecting an open state in input signal lines, which can lead to motor malfunctions and incorrect fault treatments.
Innovation Solution
A motor control device is designed with a sensing circuit connected to both the first and second signal lines, allowing the micro control unit (MCU) to determine if the second signal line is open by receiving a state output value from the sensing circuit. The sensing circuit includes an n-channel MOSFET and can also compare the first and second input signals to detect abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensing circuit is added to detect open signal lines, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensing circuit is integrated into the existing motor control device, combining the open-line detection function with the motor control functions. The sensing circuit shares the control signal lines and integrates with the MCU, avoiding separate independent detection systems and reducing overall system complexity while maintaining detection accuracy.
Solution Approach 2:
The sensing circuit acts as an intermediary component that monitors the control signal lines without disrupting the normal motor control signal transmission. It detects open lines by sensing voltage levels or signal characteristics while allowing legitimate control signals to pass through to the motor driver.
2Reliability
If multiple sensing circuits are added to detect both signal lines, then reliability is improved, but device complexity increases
Solution Approach 1:
The sensing circuit is designed with multi-functionality to detect open conditions on both the first and second control signal lines using a single integrated circuit structure. The sensing circuit can selectively monitor different signal lines or simultaneously detect faults on multiple lines, eliminating the need for separate dedicated sensing circuits for each signal line while maintaining comprehensive fault detection coverage.
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 solution enables accurate detection of open input signal lines and abnormal input signals, preventing motor malfunctions and ensuring proper fault diagnosis and treatment.
Implementation Method 1
The sensing circuit may include an n-channel metal oxide semiconductor field effect transistor (MOSFET), a gate of the n-channel MOSFET may be connected to the second signal line, and a source of the n-channel MOSFET may be connected to the first signal line.
Data Source
AI summary
Disclosed according to embodiments are a motor control device and a fault diagnosis method using the same. The motor control device includes a first reception circuit which receives a first input signal through a first signal line, a second reception circuit which receives a second input signal through a second signal line, a sensing circuit which is connected to the first signal line and the second signal line and outputs a state output value which varies according to whether the second signal line is opened, and a micro control unit (MCU) which receives the state output value output from the sensing circuit and determines whether the second signal line is opened using the received state output value.