LED lamp light controlling bus and controlling method thereof

Abstract

The invention discloses an LED light control bus and a control method thereof; the bus comprises a plurality of nodes and communication cables connected among each node; the communication cable at least comprises a signal wire; the node comprises a bus dispatching terminal; the signal wire is a pair of twisted pair cable for signal transmission between nodes; the signal is baseband data of Manchester encoding, which comprises clocked signals and data signals and is used for transmitting a clock synchronization signal simultaneously with code information. The control method comprises receiving and transmitting nameplates; inspecting correctness of a check sum; if the check is not passed, data are abandoned and the last step is returned; if the check is passed, received protocol number is judged: if the protocol number is zero, illumination data processing is executed; if the protocol number is equal to one, an address processing is set; is the protocol number is equal to Oxff, any processing is not done. The LED light control bus and a control method thereof can have 100 meters of communication distance between nodes; communication speed can reach 10Mbps; data serial transmission has no phase shift and no need of addressing in advance.

Description

technical field [0001] The invention relates to an LED lighting control technology, in particular to an LED lighting control bus and a control method thereof. Background technique [0002] As a new energy-saving light source, LED light source has been paid more and more attention by people. The core technologies of various LED communication are mainly bus mode and serial shift mode. Such as figure 1 As shown, the serial shift communication scheme is widely used in large LED screens. Although its cost is low and it has animation effects, the biggest disadvantage of this kind of scheme is that it uses TTL (Transistor-TransistorLogic, transistor-transistor logic) circuit. Flat, the data line and the clock line are transmitted separately. In this system, when the communication cable is long, the signal will attenuate. At the same time, the time delay of the clock signal and the data signal is different, and there will be a phase shift. The increase in the number of links will ...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, the serial shift communication scheme is widely used in large LED screens. Although its cost is low and it has animation effects, the biggest disadvantage of this kind of scheme is that it uses TTL (Transistor-TransistorLogic, transistor-transistor logic) circuit. Flat, the data line and the clock line are transmitted separately. In this system, when the communication cable is long, the signal will attenuate. At the same time, the time delay of the clock signal and the data signal is different, and there will be a phase shift. The increase in the number of links will cause cumulative errors until it is completely out of control

In distributed landscape lighting applications, the distance between lamp nodes is often large, and the application of this system has great limitations.

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