Smart Light Switch Power Supply for Two-Wire Dimming Control
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Solution Overview
Problem
Existing smart lighting systems face challenges such as the need for rewiring homes to accommodate neutral wires, limited ability to measure power consumption of individual lighting loads, and reliance on adapters or artificial loads for two-wire systems, which complicates dimming operations and power supply reliability.
Innovation Solution
An intelligent switch device that can operate without modifying conventional electrical installations, capable of communicating with other devices and a central control system, and equipped with a power supply that can measure power consumption, detect lighting technology types, and automatically select appropriate dimming modes, all while functioning with either two-wire or three-wire configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If smart switches are installed in conventional two-wire electrical installations, then the ease of installation is improved, but the reliability of power supply and operation deteriorates due to lack of neutral wire for continuous power supply
Solution Approach 1:
The patent introduces a capacitor as an intermediary energy storage element in the power supply circuit. The capacitor stores electrical energy during periods when the load is off or during voltage peaks, and releases this energy to maintain continuous operation of the smart switch electronics, thereby compensating for the absence of a neutral wire and ensuring reliable power supply in two-wire configurations
Solution Approach 2:
The patent employs voltage detection and adjustment mechanisms that monitor the available voltage in two-wire configurations and dynamically adjust operating parameters. The system detects voltage levels and modifies power management strategies to ensure stable operation despite the intermittent nature of power availability in two-wire installations without neutral wires
2Reliability
If adapters or artificial loads are used for two-wire smart switch configurations, then the power supply reliability is improved, but the device complexity and installation difficulty increase
Solution Approach 1:
The patent integrates the power supply management functionality directly into the smart switch device itself, merging the previously separate adapter or artificial load components with the main switch unit. This integration eliminates the need for external add-on devices, reduces overall system complexity, and simplifies installation while maintaining reliable power supply through the built-in capacitor-based energy storage system
Solution Approach 2:
The smart switch is designed to be self-sufficient by incorporating an internal capacitor-based power supply system that automatically manages energy storage and release. The device monitors its own power availability and self-regulates its operation without requiring external adapters or artificial loads, thereby eliminating additional components and simplifying the overall system
3Measurement precision
If power consumption measurement is implemented for individual lighting loads, then the measurement precision is improved, but the device complexity increases due to additional sensing and processing requirements
Solution Approach 1:
The patent implements separate current sensing circuits for each controlled lighting load, segmenting the measurement function by load. Each sensing circuit independently measures current through its respective load, and the microcontroller processes these individual measurements to calculate power consumption for each load separately, enabling precise individual load monitoring without requiring a single complex centralized measurement system
Solution Approach 2:
The patent employs digital signal processing and microcontroller-based calculations to replace complex analog measurement circuits. The system uses digital sampling of current and voltage waveforms, followed by computational algorithms in the microcontroller to determine power consumption, thereby achieving high measurement precision with simpler electronic components compared to traditional analog power measurement circuits
4Adaptability or versatility
If dimming control is implemented for different lighting technologies, then the adaptability is improved, but the device complexity increases due to multiple control methods
Solution Approach 1:
The patent implements dynamic dimming control that automatically adapts to different lighting load types based on real-time detection. The system monitors the electrical characteristics of connected loads and dynamically adjusts the dimming method (phase-cut, PWM, or other appropriate techniques) to match the specific requirements of each lighting technology, thereby achieving universal compatibility through adaptive behavior rather than fixed multi-mode control
Solution Approach 2:
The patent incorporates feedback mechanisms that continuously monitor the response of lighting loads to dimming commands. The system detects how different lighting technologies respond to various dimming methods and uses this feedback information to automatically select and adjust the optimal dimming approach, enabling seamless compatibility across multiple lighting types without requiring manual configuration or complex switching between predetermined modes
Data Source
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AI summary
A system comprises a power supply (101a), in which, a first low power module (106) receives AC power from mains electricity (111) flowing through a lighting load (112a) and a low power lighting load adapter (113) when the lighting load (112a) is off, converts AC power into a first level DC voltage and outputs the first level DC voltage to a second low power module (107) that converts the first level DC voltage into a second level DC voltage when the lighting load (112a) is off, wherein the second low power module (107) converts the first level DC voltage from a third low power module (108) into the second level DC voltage when the lighting load (112a) is on. The third low power module (108) receives a shunt current (116) and outputs the first level DC voltage to the second low power module (107) when the lighting load (112a) is on. A high power module (109) turns on the lighting load (112a) based on an activation signal.