Dimmer Connectivity Detector for 2-Wire and 3-Wire Mode
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Solution Overview
Problem
Existing dimmers lack the ability to automatically detect whether they are connected in 2-wire or 3-wire mode, which can affect operational parameters and power delivery to the load.
Innovation Solution
Incorporating a connectivity detector with resistive elements and a microcontroller to determine the connection mode by measuring signals from these elements, allowing the dimmer to decide how much power is available to the load and protect against overcurrents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If additional 2-wire/3-wire detection circuitry is implemented, then the dimmer can automatically detect connection mode, but the device complexity increases
Solution Approach 1:
The patent makes existing resistive elements (designed for error handling and overcurrent protection) serve a dual function by also enabling connection mode detection. The connectivity detector utilizes signals from these existing components to determine whether the dimmer is connected in 2-wire or 3-wire mode, eliminating the need for separate detection circuitry.
Solution Approach 2:
The patent combines the connection mode detection function with the existing error handling and overcurrent protection circuits. By merging these functions into a single integrated system using the same resistive elements and connectivity detector, the overall device complexity is reduced while achieving automatic detection capability.
2Ease of operation
If installer intervention is required to configure connection mode, then the device complexity is reduced, but the ease of operation deteriorates
Solution Approach 1:
The dimmer performs self-configuration by automatically detecting its connection mode without requiring installer intervention. The connectivity detector autonomously determines whether the dimmer is connected in 2-wire or 3-wire mode and adjusts operational parameters accordingly, making the device self-configuring and easier to operate.
3Device complexity
If existing components are reused for detection, then the device complexity is reduced, but the measurement precision may deteriorate
Solution Approach 1:
The patent successfully makes existing resistive elements serve multiple functions including error handling, overcurrent protection, and connection mode detection. The connectivity detector accurately determines connection mode by analyzing signals from these existing components, maintaining measurement precision while reducing device complexity.
Solution Approach 2:
The connectivity detector uses feedback from the signals present on existing resistive elements to accurately determine connection mode. By monitoring voltage drops or current flows through these components under different connection configurations, the system achieves precise detection despite using shared components.
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 the dimmer to automatically determine its connection mode without installer intervention, using existing components for error handling, and accurately decide power availability, enhancing operational efficiency and safety.
Implementation Method 1
a second resistive element coupled in a path going from the load over the second switch to a signal ground, and/or a first resistive element coupled in a path going from the line over the first switch to the signal ground. The dimmer moreover comprises a connectivity detector adapted for obtaining a signal from the first resistive element and/or a signal from the second resistive element
Data Source
Figure 1~2
Figure 3
AI summary
A dimmer (300) comprising a first and second switch (311, 314) coupled in series, with a node between both coupled to signal ground; a line terminal (303) for coupling the first switch (311) to an AC power source (101); a switched line terminal (304) for coupling the second switch (314) to a load (102); a first resistive element (313) coupled in a path going from the switched line terminal (304) over the second switch (314) to the signal ground, and/or a second resistive element (312) coupled in a path going from the line terminal (303) over the first switch (311) to the signal ground and a connectivity detector (335) adapted for obtaining a signal from the first and/or second resistive element (313, 312) and for determining, based on the obtained signals, whether the dimmer (300) is connected with the AC power source (101) in 2- or 3-wire mode.