Single-Wire Dimmer Switch Communication via Half-Cycle Timing
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Solution Overview
Problem
Dimmer switch systems with multiple dimmers face communication challenges when using a single traveler wire, as conflicts can arise when multiple devices simultaneously attempt to communicate, leading to inefficiencies in dimming control and status updates.
Innovation Solution
A dimmer switch system where the master dimmer transmits signals during one half-cycle of the power supply phase and accessory dimmers transmit signals during the other half-cycle, using a traveler conductor for bidirectional communication, with each dimmer equipped with a load status indicator to reflect the current dimming level of the connected load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple dimmers communicate simultaneously via a single traveler wire, then bidirectional communication between master and accessory dimmers is enabled, but signal conflicts and communication reliability deteriorate
Solution Approach 1:
The patent implements periodic action by assigning master dimmer communications to positive half-cycles and accessory dimmer communications to negative half-cycles of the AC power waveform. This temporal division allows bidirectional communication on a single traveler wire without signal conflicts, as each device transmits during its designated half-cycle period.
2Device complexity
If a single traveler wire is used for communication between multiple dimmers, then wiring complexity is reduced, but communication conflicts arise when multiple devices attempt to transmit simultaneously
Solution Approach 1:
The patent uses periodic action to divide communication opportunities into alternating half-cycles, with the master dimmer transmitting during positive half-cycles and accessory dimmers during negative half-cycles. This eliminates communication conflicts while maintaining the simplicity of single-wire architecture.
Solution Approach 2:
The patent applies preliminary action by pre-assigning transmission rights to specific devices during specific half-cycles before communication occurs. This predetermined allocation prevents conflicts by ensuring only one device attempts transmission at any given time.
3Speed
If accessory dimmers transmit signals during the same power phase as the master dimmer, then communication speed is increased, but signal interference and control accuracy deteriorate
Solution Approach 1:
The patent implements periodic action by synchronizing communications with the AC power half-cycles. Each device transmits during its designated half-cycle, maintaining optimal signal characteristics and avoiding interference that would degrade control accuracy, while still achieving rapid communication within each half-cycle period.
Data Source
AI summary
A dimmer switch system for dimming a load includes a master dimmer structured to be electrically connected to a power source and the load and to control dimming of the load by regulating power provided from the power source to the load, and at least one accessory dimmer structured to be electrically connected to the master dimmer via a traveler conductor. The master dimmer is structured to generate a first control signal on the traveler conductor during one of a positive or negative half-cycle of power from the power source. The at least one accessory dimmer is structured to generate a second control signal on the traveler conductor during the other of the positive or negative half-cycle of power from the power source.