Shut-Off Circuit for Intelligent Power Device Override
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power supply systems, particularly those utilizing Intelligent Power Devices (IPDs) in motor control systems, face challenges in safely shutting off power to motors even when instructed to do so by the control module, due to conditions like over-voltage, under-voltage, or over-current, which can lead to motor or IPD damage.
Innovation Solution
A shut-off circuit is introduced, comprising a first transistor and a second transistor connected in series between the relay and the intelligent power device, allowing the motor control module to turn on the first transistor for power supply and the computer processing unit to turn on the second transistor to direct power to ground, effectively shutting off the intelligent power device, even under normal operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor control module instructs the intelligent power device to provide power to the motor, then the motor can operate normally, but the system cannot protect itself from damage due to over-voltage, under-voltage, over-current or under-current conditions
Solution Approach 1:
The patent introduces a shut-off circuit with transistors as an intermediary component between the motor control module and the intelligent power device. This intermediary circuit receives instructions from both the motor control module and the computer processing unit, and can override the motor control module's instructions to shut off power when error conditions are detected, thereby providing system protection without requiring complex modifications to the existing control architecture
Solution Approach 2:
The control system is segmented into distinct functional blocks: the motor control module for normal operation control, the computer processing unit for error detection, and the shut-off circuit for power interruption. This segmentation allows each component to perform its specialized function independently, improving reliability while maintaining manageable complexity through modular design
2Reliability
If the intelligent power device operates under normal conditions, then power is supplied to the motor, but the device cannot be shut off to prevent damage from undetected error conditions
Solution Approach 1:
The computer processing unit continuously monitors system parameters and provides feedback to the shut-off circuit. When error conditions such as over-voltage, under-voltage, over-current or under-current are detected, the feedback signal triggers the shut-off circuit to interrupt power supply, enabling automatic protection without complicating the operational control of the intelligent power device
3Reliability
If the relay is turned on to supply power from the battery, then the motor can receive power, but the system cannot prevent power supply under erroneous conditions
Solution Approach 1:
The shut-off circuit is configured to act preliminarily by establishing a safe default state where power can be interrupted. The circuit is designed to receive and process error detection signals from the computer processing unit before harmful conditions can cause damage, enabling preventive action rather than reactive protection, thereby improving safety without significantly increasing circuit complexity
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 ensures the intelligent power device can be safely turned off, protecting it and the motor from damage, even when operating conditions are within tolerance, and can handle errors detected by the computer processing unit, regardless of the signal from the motor control module.
Implementation Method 1
The first transistor is connected in series to the second transistor at a first node. The second transistor has an emitter connected to a ground, and the first transistor and the second transistor are interposed between the relay and the intelligent power device.
Data Source
AI summary
A power distribution box having a shut-off circuit for turning off an intelligent power device is provided. The power distribution box is configured for a system wherein a motor control module is configured to send instructions to a motor which is powered by a battery. The shut-off circuit is interposed between a relay and the intelligent power device and is operable to turn off the intelligent power device when an error is detected. Accordingly, the intelligent power device may be turned off even when the operating conditions of the intelligent power device are within the tolerance built into the intelligent power device itself. Further, errors in signals generated in other devices may be processed to turn off the intelligent power device.