Rectifier Circuit for Power Supply Disconnection Detection
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Solution Overview
Problem
In semiconductor devices with shared power supplies for drive and control system blocks, disconnection of the control system's power supply line can go unnoticed, leading to potential secondary accidents due to undetected failures, as the existing emergency power compensation methods do not effectively alert users to such disconnections.
Innovation Solution
A semiconductor device with a rectifier circuit that supplies power from the drive system power supply line to the control system power supply line when the voltage difference exceeds a predetermined value, accompanied by a detection circuit that outputs a signal to notify users of the disconnection, ensuring the control system's operation is not compromised.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate power supply lines are used for drive system block and control system block to reduce power supply noise, then power supply noise is reduced, but if the control system block's power supply line is disconnected, the disconnection cannot be detected and the system crashes
Solution Approach 1:
A rectifier circuit is introduced as an intermediary component connected between the drive system power supply line and the control system power supply line. This rectifier circuit serves as a mediator that can detect voltage differences between the two power supply lines and generate detection signals when disconnection occurs, thereby enabling detection without compromising the noise isolation benefits of separate power supply lines.
Solution Approach 2:
The system implements feedback by using the rectifier circuit to continuously monitor the voltage difference between the drive system power supply line and the control system power supply line. When the voltage difference exceeds a threshold (indicating disconnection), the rectifier circuit generates a detection signal that is fed back to alert the system of the disconnection condition, enabling real-time monitoring and response.
2Reliability
If power is supplied from the drive system block to the control system block when the control power supply line is disconnected, then the control system operation is maintained, but the disconnection becomes undetectable and hidden safety issues arise
Solution Approach 1:
The rectifier circuit acts as an intermediary detection mechanism that operates independently of the power compensation function. It monitors the voltage difference between power supply lines and generates detection signals for disconnection conditions, separate from the actual power supply function, thereby maintaining both operational continuity and detection capability.
Solution Approach 2:
The system segments the power supply and detection functions into separate components. The rectifier circuit is dedicated solely to detection purposes, while the power supply function remains separate. This segmentation allows the detection circuit to identify disconnection conditions without being interfered by the power compensation operation, preserving detection sensitivity while maintaining operational continuity.
3Reliability
If a detection circuit is added to detect power supply line disconnection, then disconnection can be detected, but the device complexity increases
Solution Approach 1:
The rectifier circuit is designed with multi-functionality, serving both as a power rectification component and as a disconnection detection mechanism. By utilizing the inherent voltage difference detection capability of the rectifier circuit, the system achieves detection functionality without adding a completely separate detection circuit, thereby reducing overall device complexity while maintaining reliable detection capability.
Solution Approach 2:
The rectifier circuit performs self-service by using its own operational characteristics (voltage difference response) to detect disconnection conditions. The circuit monitors itself and generates detection signals based on its own behavior when voltage differences occur, eliminating the need for additional dedicated detection components and reducing system 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
The solution reliably informs users of power supply line disconnections that might otherwise be undetected, preventing hidden safety issues and ensuring the control system's functionality, thereby enhancing operational safety.
Implementation Method 1
a rectifier circuit supplies power by allowing a current to flow from a drive system power supply line to a control system power supply line
Data Source
AI summary
There is provided a semiconductor device including a power compensation circuit in an apparatus in order to notify of a power supply disconnection failure that a user of the apparatus may not recognize. The power compensation circuit includes a rectifier circuit and a detection circuit. The rectifier circuit is coupled between a first power supply line and a second power supply line. If the voltage of the second power supply line is lower than the voltage of the first power supply line by a predetermined value or more, the rectifier circuit supplies power from the first power supply line to the second power supply line. The detection circuit outputs a detection signal when the current flows through the rectifier circuit.