Two-Wire Tilt Switch with Integrated Supply Stage
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Solution Overview
Problem
Existing tilt switches, particularly those replacing mercury switches, face challenges due to higher costs and complexity associated with electronic evaluation and power supply requirements, making them less suitable for one-to-one replacements in legacy applications.
Innovation Solution
A two-wire tilt switch design featuring a combined supply and output stage that maintains low voltage drop in the closed state and low leakage current in the open state, utilizing a MEMS acceleration sensor with adjustable switching points through analog or digital signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic sensor elements (MEMS, liquid, or pendulum) are used to replace mercury switches, then measurement precision and reliability are improved, but device complexity and cost increase due to additional power supply and electronic evaluation circuitry
Solution Approach 1:
The patent combines the power supply function and output switching function into a single integrated circuit that operates without external power. The tilt sensor element is directly coupled to this integrated circuit, merging sensing and actuation functions. This eliminates separate power supply requirements and reduces overall device complexity while maintaining electronic precision advantages.
Solution Approach 2:
The integrated circuit performs multiple functions: it provides the switching output, generates internal power through the two-wire connection, and interfaces with the tilt sensor element. This multi-functional design eliminates the need for separate power supply circuitry and reduces the number of components required, directly addressing the complexity issue while preserving measurement precision.
2Reliability
If electronic tilt switches with separate power supply and output stages are used, then switching reliability is improved, but cost and complexity increase making them unsuitable for one-to-one replacement of legacy mercury switches
Solution Approach 1:
The patent merges the power supply stage and output stage into a single integrated circuit that requires only two external connections. This integration maintains the reliable switching performance of electronic devices while reducing the terminal count to match legacy two-wire mercury switch installations, enabling direct one-to-one replacement without additional wiring complexity.
Solution Approach 2:
The integrated circuit generates its own power internally through the two-wire connection, eliminating the need for external power supply circuitry. This self-powered operation simplifies the overall device architecture while maintaining reliable electronic switching, directly addressing both reliability and complexity concerns for legacy replacements.
3Device complexity
If a combined supply and output stage is used in the two-wire tilt switch, then device complexity is reduced and cost is lowered, but power consumption characteristics must be carefully controlled to maintain reliability
Solution Approach 1:
The integrated circuit is designed to dynamically adjust its power consumption characteristics based on the switch state. In the closed state, it maintains low voltage drop to minimize power loss. In the open state, it maintains low leakage current to reduce standby power consumption. This parameter optimization ensures reliable operation while minimizing energy usage across all operating conditions.
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 design allows for a cost-effective and reliable retrofit solution requiring only two terminals, suitable for applications like PLC inputs and simple consumers, with reduced power consumption and adjustable switching points.
Implementation Method 1
a sensor element, in particular a MEMS acceleration sensor with analog output signal
Data Source
Figure 1~2
AI summary
Known tilt switches are less than ideally suited for replacing mercury switches. Solution A tilt switch (1) having an open state and a closed state and comprising an electronics assembly (3, 4), characterized in a combined supply and output stage (2) configured such that the assembly (3, 4) is supplied in both states.