Two-Wire Lamp Control Signal Transmission for Low-Duty PWM Loads
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Solution Overview
Problem
The transformation of a four-wire lamp system into a two-wire lamp system results in lamp failure due to power transmission interruptions caused by low duty cycles of lamp control signals, along with increased data transmission time and delay.
Innovation Solution
A method and system that synchronously samples level states of R, G, and B lamp control signals in a four-wire system, generates a preset converted signal, integrates electric power, superposes the coded signal onto integrated power, and transmits it through a two-wire system for signal-power separation and decoding to drive the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lamp control signals within a complete period are sampled and converted into coded signals for transmission in a two-wire system, then the wiring cost and difficulty are reduced, but power transmission interruption occurs when the duty cycle of lamp control signals is low
Solution Approach 1:
The patent combines power transmission and control signal transmission into a single two-wire system. The control signals are superimposed on the power transmission line using PWM modulation, allowing both power and control data to share the same physical medium, thereby reducing wiring complexity while maintaining reliable power delivery even during low duty cycle periods.
Solution Approach 2:
The patent employs periodic PWM (Pulse Width Modulation) signaling where control information is encoded in periodic pulses superimposed on the power line. This periodic action ensures that control signals are transmitted in synchronized intervals, preventing power transmission interruptions while maintaining reliable communication in the two-wire system.
2Adaptability or versatility
If lamp control signals within a complete period are sampled and converted into coded signals, then the system can be transformed to two-wire configuration, but the data transmission volume increases greatly leading to longer transmission time and larger data delay
Solution Approach 1:
The patent changes the parameter representation from sampling complete periodic waveforms to using compact PWM duty cycle values. Instead of transmitting full waveform data, only the essential control parameter (duty cycle ratio) is encoded and transmitted, dramatically reducing data volume and transmission delay while maintaining full system adaptability.
Solution Approach 2:
The patent extracts only the essential control information (the duty cycle ratio representing the proportion of high-level to low-level periods) from the complete lamp control signal waveform. By transmitting only this extracted key parameter rather than the entire signal sequence, data transmission volume is greatly reduced while the receiving end can reconstruct the necessary control signals.
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
Ensures continuous power transmission during low duty cycles, reduces data transmission quantity, and achieves synchronous signal transmission with minimal delay, thereby stabilizing the system operation and reducing wiring costs.
Implementation Method 1
a signal superposition module, configured for superposing the coded signal onto the integrated electric power to obtain composite electric power
Data Source
AI summary
A four wire-to-two wire lamp control signal transmission method includes: level states of lamp control signals in a four-wire system being synchronously sampled within a preset sampling period, a preset converted signal corresponding to control information carried by the level states of the lamp control signals being generated and encoded to obtain a coded signal superposed onto integrated electric power of the four-wire system to form composite electric power transmitted by a two-wire system to drive a load. Lamp control signal transmission can be achieved without sampling lamp control signals within a complete period. The level states of the lamp control signals are transmitted in the form of the preset converted signal, such that the data transmission quantity can be reduced, and the signals can be transmitted approximately synchronously, solving the problem that a lamp fails to be driven in case of a low duty cycle of lamp control signals.