Power Source Switch Control Device for Defect Detection
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Solution Overview
Problem
Existing power source switch control devices face challenges in accurately detecting defective switching elements, particularly in semiconductor relays used with high-voltage systems, where identifying faulty elements is difficult due to complex current and voltage flow management.
Innovation Solution
A power source switch control device is designed with upstream and downstream bidirectional cutoff circuits, incorporating switching elements, diodes, and detection units, which are controlled by a controller to manage power and regeneration currents, allowing for the detection of defects through forward voltage and current monitoring during different operational phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semiconductor relays with multiple switching elements are used to control high-voltage power source supply, then the power source control capability is improved, but the difficulty of specifying defective switching elements increases
Solution Approach 1:
The patent divides the bidirectional cutoff circuit into multiple switching elements (first switching element for power source current, second switching element for regeneration current) with separate detection units for each. This segmentation allows independent monitoring of each switching element's state, enabling precise identification of defective elements while maintaining reliable control of high-voltage power source supply.
2Adaptability or versatility
If bidirectional cutoff circuits with multiple switching elements are implemented, then the power source and regeneration current control is improved, but the device complexity increases
Solution Approach 1:
The patent implements a controller that universally manages multiple switching elements and detection units through a single control logic. The controller determines defects by analyzing detection results from different detection units based on circuit operation states, providing a unified control mechanism that handles both power source current and regeneration current while maintaining adaptability across different operating conditions.
3Measurement precision
If detection units are added to monitor each switching element, then the defect detection precision is improved, but the device complexity increases
Solution Approach 1:
The patent places detection units at specific locations parallel to each switching element, with each detection unit dedicated to monitoring its corresponding switching element. This localized detection approach enables precise identification of defective elements by directly measuring the state of each switching element, while the controller integrates these local measurements to determine overall system health based on the current operation state.
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
Enables precise detection of defective switching elements, facilitating early and reliable defect identification and recovery, ensuring safe and efficient operation of high-voltage systems by determining the state of each switching element.
Implementation Method 1
a first diode provided to have a conduction direction opposite to a direction in which the power source current flows and connected in parallel with the first switching element; a second diode provided to have a conduction direction opposite to a direction in which the regeneration current flows and connected in parallel with the second switching element
Implementation Method 2
a first detection unit connected in parallel with the first diode and configured to detect forward voltage of the first diode; a second detection unit connected in parallel with the second diode and configured to detect forward voltage of the second diode
Data Source
AI summary
A power source switch control device includes a detection circuit, a detection circuit, a detection circuit, and a detection circuit. The detection circuit detects forward voltage of a body diode of a FET, and the detection circuit detects forward voltage of a body diode of a FET. The detection circuit detects forward voltage of a body diode of a FET, and the detection circuit detects forward voltage of a body diode of a FET. A controller determines whether a defect of a power circuit has occurred based on results of the detection by the detection circuits to. Accordingly, the power source switch control device can appropriately detect defect of a switching element of a power source.