Two-Wire Lamp Control via Level Sampling and Power Superposition
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Solution Overview
Problem
Four-wire lamp systems face high wiring costs and installation inconvenience due to multiple wires, and transforming them into two-wire systems leads to signal transmission failures when lamp control signals are sampled and converted, resulting in insufficient power transmission and lamp driving failures.
Innovation Solution
A lamp control signal transmission method based on level sampling, where R, G, and B control signals are synchronously sampled within a preset period to generate coded signals, integrated with power, superposed onto composite power, and transmitted via two-wire system, and decoded to drive a load, and control system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If four-wire lamp system is transformed into two-wire system to reduce wiring cost, then wiring cost and installation complexity are reduced, but signal transmission fails when lamp control signals remain at low duty cycle for excessively long time due to lack of power transmission
Solution Approach 1:
The patent combines signal transmission and power transmission into a single two-wire system. The control signals and power are merged into one transmission medium, eliminating the need for separate signal wires while ensuring that power is continuously available even when control signals are at low duty cycles. This resolves the contradiction by integrating both functions into a unified transmission channel.
Solution Approach 2:
The patent introduces an intermediary mechanism where the control signals modulate the power transmission. The power line acts as an intermediary that carries both power and encoded control information, allowing reliable signal transmission without requiring separate signal wires. This mediator enables the system to maintain both reduced wiring complexity and reliable signal transmission.
2Measurement precision
If lamp control signals are sampled within complete period and converted into coded signals in traditional two-wire system, then brightness control function is accurately reproduced, but signal transmission fails due to lack of power transmission when control signals remain at low duty cycle
Solution Approach 1:
The patent employs periodic sampling of control signals within defined periods, converting them into coded signals that are transmitted alongside continuous power. The periodic nature ensures accurate brightness control while the continuous power transmission prevents signal failure, resolving the contradiction between precise measurement and reliable transmission.
Solution Approach 2:
The patent changes the parameter of power transmission from intermittent (dependent on signal duty cycle) to continuous. By maintaining constant power transmission regardless of control signal duty cycle, the system ensures reliable signal transmission while preserving precise brightness control through coded signal modulation of the continuous power.
3Reliability
If four-wire system is used to transmit power and control signals synchronously, then power transmission and signal transmission are reliable, but wiring cost and installation inconvenience increase due to large number of wires
Solution Approach 1:
The patent merges the four-wire system (separate power and signal wires) into a two-wire system where both power and control signals share the same transmission medium. This consolidation reduces wiring complexity while maintaining reliable transmission by ensuring continuous power availability and using coded modulation for control signals.
Solution Approach 2:
The patent makes the two-wire system universal by enabling it to perform multiple functions: continuous power transmission and coded control signal transmission simultaneously. This multi-functionality eliminates the need for dedicated signal wires while preserving reliable transmission, reducing wiring complexity without sacrificing reliability.
Data Source
AI summary
A lamp control signal transmission method includes level states of R, G and B lamp control signals in a four-wire system being synchronously sampled within a preset sampling period, a corresponding coded signal comprising a signal header and three bits of coded data corresponding to R, G and B control information carried by the level states of the three lamp control signals being generated, and then, the coded signal being superposed onto integrated power of the four-wire system to form composite power that is transmitted by a two-wire system to drive a load. Sampling lamp control signals within a complete period is not needed in the process of transforming a four-wire lamp system into a two-wire lamp system, the coded signal can be transmitted approximately synchronously at a low delay, and power transmission is guaranteed during two-wire signal transmission.