Position Detecting Device Abnormal Voltage Protection
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Solution Overview
Problem
Conventional position detecting devices for vehicles, such as electronic throttle apparatuses, face issues with terminal short-circuiting due to water or conductive particles, which limits the placement of magnetic detector modules and affects the integrated circuit's protection.
Innovation Solution
A position detecting device with an output circuit that includes an output transistor, control circuit, output conductor, voltage detection circuit, and current shut-off circuit, which regulates voltage and shuts off electric conduction when abnormal voltages are detected, allowing for more flexible terminal arrangement and protection from adverse influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If terminals of the magnetic detector module and motor terminals are arranged adjacently at the connector part, then the connector part can be compact and efficient, but water or conductive particles may cause short-circuiting between terminals
Solution Approach 1:
The patent introduces an insulating structure (resin mold or insulating sheet) as an intermediary between adjacent terminals in the connector part. This insulating structure physically separates the terminals while maintaining their compact arrangement, preventing water or conductive particles from causing short-circuits. The insulating structure acts as a mediator that allows close terminal placement without compromising electrical isolation.
2Reliability
If output terminals of the magnetic detector module are located away from motor terminals to prevent short-circuiting, then the integrated circuit is protected, but the terminals cannot be freely located and arrangement flexibility is reduced
Solution Approach 1:
The patent segments the connector part into distinct regions using insulating structures. The insulating structures create separate zones that allow terminals to be freely positioned within their designated areas while maintaining proper spacing from other terminals. This segmentation enables flexible terminal arrangement within each zone while ensuring electrical isolation between zones, resolving the conflict between protection and flexibility.
3Reliability
If two magnetic detector modules are provided in the electronic throttle apparatus, then detection accuracy and reliability can be improved, but the limited connector part area restricts their placement locations
Solution Approach 1:
The insulating structures act as mediators that enable dense packing of multiple magnetic detector modules within the limited connector area. By providing electrical isolation through these insulating structures, the design allows terminals of multiple modules to be placed closer together than would be possible without such isolation, thereby accommodating multiple modules in the constrained space while maintaining detection reliability.
Data Source
AI summary
A high-side output transistor and a low-side output transistor of an output circuit control voltages of conductors, which connect a power supply terminal and ground, and outputs a voltage signal to an output terminal through an output conductor. A voltage output circuit detects a voltage applied to the high-side output transistor based on a potential difference of a first resistor provided closer to the output terminal side. A comparator circuit outputs a signal to turn off a first switch and a second switch provided in the conductors, when the output voltage of the voltage output circuit exceeds a reference voltage Vr.