Multi-Stage Vehicle Switch for In-Rush Current Suppression
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Solution Overview
Problem
Complex vehicle power systems, such as those in unmanned aerial vehicles (UAVs), face challenges in reliably switching power to loads due to in-rush currents and sparking when using single-stage switches, which can affect mission success and vehicle reliability.
Innovation Solution
A multi-stage switch is introduced that mechanically enforces a predefined order of electrical paths with specific resistive properties to suppress in-rush currents and sparking, using a single key or mechanism to switch between stages, ensuring power is safely and efficiently routed to loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single-stage switch is used to switch power to loads, then the switching operation is simple, but in-rush currents and sparking occur which reduce reliability
Solution Approach 1:
The switch is divided into multiple stages (first stage, second stage, third stage) with different electrical path configurations. Each stage provides a different resistive property to control the power flow sequence, eliminating in-rush currents and sparking while maintaining operational simplicity through a single key mechanism.
2Reliability
If multiple electrical paths with different resistive properties are used to suppress in-rush currents, then power switching reliability improves, but the switch structure becomes more complex
Solution Approach 1:
Multiple electrical paths with different resistive properties are merged into a single switch structure that is controlled by one key. The key's positional changes (first position, second position, third position) simultaneously activate different electrical paths, achieving complex power control through a unified mechanism.
Solution Approach 2:
The single key mechanism serves multiple functions: it selects between different electrical paths, controls power flow sequence, and manages switch states (on/off). This multi-functional design achieves reliable power distribution without requiring separate controls for each electrical path.
3Reliability
If a predefined order of electrical paths is enforced to control power flow, then in-rush currents are suppressed, but the switching operation becomes more complex
Solution Approach 1:
The electrical paths are pre-configured with specific resistive properties and connection sequences. The switch structure is designed beforehand to enforce a predetermined power flow order through its mechanical configuration, eliminating the need for complex real-time control decisions during operation.
Solution Approach 2:
The key acts as an intermediary mechanism that translates simple user actions (inserting and positioning the key) into complex electrical path selections. The key's positional states mediate between the user's simple operation and the system's requirement for controlled power flow sequencing.
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 multi-stage switch effectively suppresses in-rush currents and sparking, enhancing the reliability and efficiency of power distribution in complex vehicle power systems, ensuring safe and reliable operation for various mission phases.
Implementation Method 1
A multi-stage switch is introduced that mechanically enforces a predefined order of electrical paths with specific resistive properties to suppress in-rush currents and sparking
Data Source
AI summary
A switch for switching power to a load of a vehicle may be described. In an example, the switch may include a number of members configured to move between switch positions in a predefined order such that a load and a power source are electrically coupled or electrically decoupled via the switch based on the predefined order. In particular, a first member may be configured to move to a first switch position and form a first electrically conductive path having a first electrical property. A second member may be configured to move to a second switch position and form a second electrically conductive path having a second electrical property different from the first electrical property. A third member may be configured to move the second member based on movement of the first member to the first switch position such that movement of the second member to the second switch position may occur based on the movement of the first member to the first switch position.