DALI Control Device Signal Level Encoding
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Solution Overview
Problem
The DALI communications standard faces bus congestion and high reaction times when a large number of devices are connected, limiting information transmission capacity and compatibility with legacy devices.
Innovation Solution
The proposed solution involves a DALI control device with a DALI interface that utilizes both signal transitions and signal levels for information encoding and decoding, employing Manchester coding combined with amplitude or frequency modulation, and a galvanic decoupler for interference prevention, allowing for increased spectral efficiency and robust signal transmission without increasing bandwidth or clock rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large number of devices are connected to a single DALI bus system, then the information transmission capacity is increased, but bus congestion occurs leading to high reaction times
Solution Approach 1:
The patent applies dimensionality change by utilizing the amplitude dimension of the DALI signal in addition to the temporal dimension. While traditional Manchester coding only uses signal transitions (edges) for data transmission, this invention encodes additional information in the signal amplitude levels during the HIGH and LOW pulses. This creates an additional dimension for information carrying, effectively doubling the information capacity without increasing the clock rate or bandwidth.
2Adaptability or versatility
If only signal transitions are utilized for encoding, then compatibility with legacy devices is maintained, but information carrying capacity is limited
Solution Approach 1:
The patent segments the information transmission into two independent channels: the first channel uses signal transitions (edges) for legacy compatibility, and the second channel uses signal amplitude levels during HIGH and LOW pulses for enhanced capacity. This segmentation allows both legacy devices (which only process transitions) and new devices (which can process both channels) to coexist on the same bus without interference.
Solution Approach 2:
The DALI signal is made multi-functional by enabling it to carry information through multiple mechanisms simultaneously: edge transitions for traditional commands and amplitude modulation for additional data layers. This universality allows the same physical medium to serve both legacy and enhanced functionality requirements.
3Productivity
If amplitude modulation is used to increase information capacity, then spectral efficiency is improved, but signal robustness may be reduced
Solution Approach 1:
The patent introduces a galvanic decoupler as an intermediary component that galvanically isolates the DALI control device from the DALI bus while maintaining signal transmission. This decoupler acts as a mediator that prevents ground loops and electrical interference from affecting the amplitude-modulated signals, thereby maintaining signal robustness while enabling the use of amplitude modulation for increased information capacity.
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
This approach enhances information transmission capacity while maintaining compatibility with legacy devices, reducing reaction times and preventing interference, thereby improving the overall efficiency of the DALI bus system.
Implementation Method 1
the DALI interface moreover comprises a galvanic decoupler, adapted to perform a galvanic decoupling of the DALI control device and a connection port to a secondary DALI line
Implementation Method 2
the high frequency clocked DC-DC converter comprising a transformer is adapted to transmit a load modulation of a secondary side to a primary side, forming a reverse channel
Implementation Method 3
the encoder, adapted to encode a first information based on Manchester coding, and encode a second information based on a signal level of HIGH and/or LOW pulses of the Manchester coding
Implementation Method 4
the decoder, which is adapted to decode a first information based on Manchester coding and decode a second information based on a signal level of HIGH and/or LOW pulses of the Manchester coding
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A DALI control device (10) comprises a DALI interface (21) adapted to receive and/or transmit DALI signals. Additionally, the DALI interface (21) is adapted to utilize a signal level of the DALI signals.