Two-Wire Smart Switch Power Supply Circuit
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Solution Overview
Problem
Existing smart switches require three wires for operation, which is not typically available in conventional home electrical installations, and existing power supplies for two-wire smart switches provide insufficient power and are complex, failing to accurately measure individual lighting load consumption.
Innovation Solution
A power supply system that operates with two or three wires, capable of controlling up to three independent lighting loads without rewiring, providing constant power for microcontrollers, user interfaces, and communication modules, and measuring power consumption by outputting a voltage signal proportional to the current consumed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a three-wire configuration is used for smart switches, then sufficient power can be supplied to microcontrollers and communication modules, but conventional home electrical installations only have two wires available requiring complete rewiring
Solution Approach 1:
The smart switch is designed to function universally in both two-wire and three-wire configurations. The power supply circuit can operate in capacitive mode when only two wires are available, or in resistive mode when three wires are present, eliminating the need for complete rewiring while maintaining full functionality of microcontrollers and communication modules.
Solution Approach 2:
The power supply circuit dynamically changes its operating parameters based on the available wire configuration. In two-wire mode, it operates with capacitive coupling and limited power; in three-wire mode, it switches to resistive loading with full power availability, adapting to the installation environment without requiring manual configuration or rewiring.
2Ease of manufacture
If existing two-wire power supply designs are used, then installation is simpler, but the power delivered is very low causing elements like LED or communication modules to turn off
Solution Approach 1:
The power supply circuit dynamically adjusts its operation based on real-time conditions. When operating in two-wire capacitive mode, it optimizes power extraction during specific phases of the AC cycle. When three-wire resistive mode is detected, it switches to a more aggressive power extraction strategy, ensuring maximum power delivery to all components including LED indicators and communication modules.
Solution Approach 2:
The circuit performs preliminary charging of energy storage capacitors during periods when power demand is low, preparing energy reserves before high-power operations are needed. This ensures that communication modules and LED indicators receive sufficient power even in two-wire configurations where power availability is limited.
3Ease of manufacture
If existing two-wire power supply designs are used, then installation is simpler, but the circuit becomes complex requiring a microprocessor to control the power supply
Solution Approach 1:
The power supply control functions are merged with the existing microcontroller that already runs the smart switch logic. The same microcontroller monitors power availability, detects wire configuration, and adjusts power supply parameters, eliminating the need for a separate power management microprocessor and reducing overall circuit complexity.
Solution Approach 2:
The power supply circuit automatically detects the wire configuration and adjusts its operation without external intervention. The system self-configures between two-wire and three-wire modes, and the microcontroller autonomously manages power distribution to various components, eliminating the need for complex external control circuits or manual setup procedures.
4Measurement precision
If power measurement is implemented in existing designs, then power consumption can be measured, but only the combined power of all loads in the circuit can be measured, not individual load consumption
Solution Approach 1:
The power measurement function is segmented into individual load measurements. Each controlled outlet has its own measurement circuit that independently monitors current and voltage, allowing the system to calculate and report power consumption for each load separately rather than measuring only the aggregate power of all loads combined.
Solution Approach 2:
The measurement system is designed to provide multiple functions: it can measure individual load power consumption, calculate total circuit power, detect load presence, and provide this information through various communication interfaces. This multi-functional approach consolidates what would otherwise require separate measurement systems into a single integrated solution.
Data Source
AI summary
The present invention refers to an Electrical Power System (EPS) or Power Supply for a smart switch for controlling up to three independent lighting loads (3 gang) within an electrical installation that has two or three wires in the switch box (two-wire and three-wire switches). The smart switch is able to operate in a conventional switch box without access to the neutral wire. If the lighting device is a low power lighting device, only one adapter is used to avoid flickering or unintentional lighting. The Power Supply also provides a voltage signal indicating the current consumed by the lighting loads.