CN201765779U

CN201765779U - LED (light emitting diode) luminaire and cascading structure thereof

Info

Publication number: CN201765779U
Application number: CN2010202625264U
Authority: CN
Inventors: 蔡如海; 罗威; 陈邓伟; 熊顺进
Original assignee: GUANGZHOU JOINMAX DISPLAY TECHNOLOGY Co Ltd
Current assignee: GUANGZHOU JOINMAX DISPLAY TECHNOLOGY Co Ltd
Priority date: 2010-07-19
Filing date: 2010-07-19
Publication date: 2011-03-16
Anticipated expiration: 2020-07-19

Abstract

The utility model discloses an LED (light emitting diode) luminaire and a cascading structure thereof. The luminaire comprises an LED display unit, a DMX driver and a signal acquisition circuit, wherein the DMX driver comprises a DMX decoding unit, an RS485 interface converter and a constant-current driving unit. The cascading structure comprises a DMX controller, a DMX distributor and a plurality of the LED luminaires, wherein the LED luminaire is internally provided with current, voltage and temperature sensors, and the DMX decoding unit can detect the working condition of the luminaire and report the luminaire condition to an upper computer when in need. The cascading structure adopted by the luminaire can complete automatic address coding and detect the working condition of the luminaire, is simple and is convenient in fault detection.

Description

A kind of LED light fixture and cascade structure thereof

Technical field

The utility model relates to a kind of LED light fixture, particularly a kind of LED light fixture and cascade structure thereof that can automatic addressing.

Background technology

The LED light fixture has the good characteristics of controllability, realizes at present usually the intellectuality control of LED light fixture by the DMX512 agreement, and then can visualize various riotous with colour, landscape effects that Technic Beat is cheerful and light-hearted, tuneful.DMX512 is according to EIA485 (RS485) Interface design, and communication mode adopts the asynchronous communication form, and every frame is made of 1 start bit, 8 light modulation data and 2 position of rests, can transmit 512 frames (promptly having 512 passages) each time.Each LED light fixture is generally regulated and control by three, four passages, three passages are respectively red, green, blue, also can increase a white channel and carry out brightness regulation, each passage can be realized 256 grades of gray-scale Control, like this, a DMX512 controller can be controlled a plurality of LED light fixtures, and therefore, the cascade structure between a plurality of light fixtures directly influences the complicacy and the reliability of whole light source system.

The utility model content

The purpose of this utility model is to provide a kind of LED light fixture that is suitable for cascade.

The technical solution of the utility model is: a kind of LED light fixture comprises led display unit, DMX driver and signal acquisition circuit; Described DMX driver comprises DMX decoding unit, RS485 interface convertor and constant current driving unit; Described DMX decoding unit is provided with signal input end, control signal output ends, acquired signal output terminal, acquired signal input end, writes the coded signal input end and write the coded signal output terminal; Described signal input end and acquired signal output terminal all are electrically connected with the signaling interface end of RS485 interface convertor; Described control signal output ends is electrically connected with the input end of constant current driving unit, and described constant current driving unit provides the constant current pulse-width signal for led display unit; Described signal acquisition circuit is used to gather the voltage and current signal of the constant current pulse-width signal of described constant current driving unit output, and the internal circuit temperature of described DMX driver, described signal acquisition circuit inputs to the acquired signal input end with voltage, electric current and the internal circuit temperature signal that collects, described DMX decoding unit is converted to voltage, electric current and the internal circuit temperature signal of input from the discernible signal of acquired signal output terminal output, and discernible signal is converted to through the RS485 interface convertor can be through the differential feedback signal of RS485 bus transfer.

Another purpose of the present utility model provides a kind of cascade structure, and this cascade structure comprises DMX controller, DMX divider and a plurality of LED light fixture; The output terminal of described DMX controller is electrically connected with the input end of DMX divider, and the output terminal of described DMX divider is electrically connected with the differential signal interface end of the RS485 interface convertor of each LED light fixture by the RS485 bus; The coded signal output terminal of writing of described DMX divider is electrically connected by serial signal line with the coded signal input end of writing of first LED light fixture, and the write coded signal input end of coded signal output terminal by serial signal line and next LED light fixture adjacent thereto of writing of each LED light fixture is electrically connected.

The beneficial effects of the utility model are: the cascade structure that LED light fixture described in the utility model is adopted can be finished the automatic address coding, and cascade structure is simple, is convenient to trouble shooting.

Description of drawings

Fig. 1 is that the inner structure of LED light fixture described in the utility model is formed;

Fig. 2 is the cascade structure of LED light fixture shown in Figure 1.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

As shown in Figure 1, LED light fixture described in the utility model comprises led display unit 10, DMX driver 20 and signal acquisition circuit 30.Described DMX driver 20 comprises DMX decoding unit 21, RS485 interface convertor 22 and constant current driving unit 23.Described DMX decoding unit 21 is provided with signal input end 211, control signal output ends 216, acquired signal output terminal 212, acquired signal input end 215, writes coded signal input end 213 and write coded signal output terminal 214.Described signal input end 211 and acquired signal output terminal 212 all are electrically connected with the signaling interface end of RS485 interface convertor 22, wherein, described acquired signal output terminal 212 and signal input end 211 can shared ports, and two differential signal interface end of described RS485 interface convertor 22 are used to connect RS485 bus 60.The digital control signal that is used to control LED light fixture 100 inputs to DMX decoding unit 21 through RS485 interface convertor 22 conversion backs by signal input end 211 and decodes, and the pulse-width signal that is used to control constant current driving unit 23 is exported by control signal output ends 216 in the decoding back.

Described control signal output ends 216 is electrically connected with the input end of constant current driving unit 23, and described constant current driving unit 23 provides the constant current pulse-width signal for led display unit 10.

Described signal acquisition circuit 30 is used to gather the voltage and current signal of the constant current pulse-width signal of constant current driving unit 23 outputs, and the internal circuit temperature of DMX driver 20, described signal acquisition circuit 30 is with the voltage that collects, electric current and internal circuit temperature signal input to acquired signal input end 215, the voltage of 21 pairs of inputs of described DMX decoding unit, electric current and internal circuit temperature signal are handled, be converted into from the discernible signal of acquired signal output terminal 212 outputs, discernible signal is converted to through RS485 interface convertor 22 can be through the differential feedback signal of RS485 bus 60 transmission, wherein, described RS485 interface convertor 22 is the half-duplex operation mode.

During a plurality of LED light fixture cascade, as shown in Figure 2, the output terminal of DMX controller 300 is electrically connected with the input end of DMX divider 200, the output terminal of described DMX divider 200 is electrically connected with the differential signal interface end of the RS485 interface convertor 22 of each LED light fixture 100 by RS485 bus 60, be about to each LED light fixture 100 and all hang on the RS485 bus 60, by the digital control signal of RS485 bus transfer.And the RS485 bus with the differential feedback signal feedback to DMX controller 300 as output digital control signal reference frame.

The coded signal output terminal of writing of described DMX divider is electrically connected by serial signal line 70 with the coded signal input end 213 of writing of first LED light fixture 100, and the write coded signal input end 213 of coded signal output terminal 214 by serial signal line 70 and next LED light fixture 100 adjacent thereto of writing of each LED light fixture 100 is electrically connected.

The automatic address coded system of cascade structure described in the utility model is as follows: write code instruction when DMX controller 300 sends by RS-485 bus 60, and DMX divider 200 by its write the coded signal output terminal to first LED light fixture 100 send when writing coded signal (as, can be simple height, low level), first LED light fixture 100 on this communication link enters writes a yard waiting status, DMX controller 300 sends first group address by RS485 bus 60, at this moment, because the coded signal input end 213 of writing of other LED light fixture does not receive and writes coded signal, therefore, have only first LED light fixture can receive this first group address, and by DMX decoding unit 21 these first group addresss of record; Simultaneously, DMX decoding unit 21 can be write coded signal to 100 transmissions of next stage LED light fixture by writing coded signal output terminal 214, next stage LED light fixture 100 will enter writes a yard waiting status, DMX controller 300 sends second group address by RS485 bus 60, second LED light fixture response, and by its DMX decoding unit 21 these second group addresss of record, and then send to next stage LED light fixture 100 and to write coded signal, so analogize, the address of last LED light fixture 100 on this communication link establishment automatically finishes.

Being the utility model preferred embodiment only in sum, is not to be used for limiting practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should belong to technology category of the present utility model.

Claims

1. a LED light fixture is characterized in that: comprise led display unit, DMX driver and signal acquisition circuit; Described DMX driver comprises DMX decoding unit, RS485 interface convertor and constant current driving unit; Described DMX decoding unit is provided with signal input end, control signal output ends, acquired signal output terminal, acquired signal input end, writes the coded signal input end and write the coded signal output terminal; Described signal input end and acquired signal output terminal all are electrically connected with the signaling interface end of RS485 interface convertor; Described control signal output ends is electrically connected with the input end of constant current driving unit, and described constant current driving unit provides the constant current pulse-width signal for led display unit; Described signal acquisition circuit is used to gather the voltage and current signal of the constant current pulse-width signal of described constant current driving unit output, and the internal circuit temperature of described DMX driver, described signal acquisition circuit inputs to the acquired signal input end with voltage, electric current and the internal circuit temperature signal that collects, described DMX decoding unit is converted to voltage, electric current and the internal circuit temperature signal of input from the discernible signal of acquired signal output terminal output, and discernible signal is converted to through the RS485 interface convertor can be through the differential feedback signal of RS485 bus transfer.

2. the cascade structure of a LED light fixture is characterized in that: comprise the described LED light fixture of DMX controller, DMX divider and a plurality of claim 1; The output terminal of described DMX controller is electrically connected with the input end of DMX divider, and the output terminal of described DMX divider is electrically connected with the differential signal interface end of the RS485 interface convertor of each LED light fixture by the RS485 bus; The coded signal output terminal of writing of described DMX divider is electrically connected by serial signal line with the coded signal input end of writing of first LED light fixture, and the write coded signal input end of coded signal output terminal by serial signal line and next LED light fixture adjacent thereto of writing of each LED light fixture is electrically connected.