CN214799975U

CN214799975U - Constant-voltage dimming device for multi-path LED lamp based on DMX512 protocol

Info

Publication number: CN214799975U
Application number: CN202120479364.8U
Authority: CN
Inventors: 刘有发; 胡松松; 刘明宇
Original assignee: Shenzhen Ex Lighting Technology Holdings Co Ltd
Current assignee: Shenzhen Ex Lighting Technology Holdings Co Ltd
Priority date: 2021-03-05
Filing date: 2021-03-05
Publication date: 2021-11-19
Anticipated expiration: 2031-03-05

Abstract

The utility model discloses a constant voltage device of adjusting luminance for multichannel LED lamps and lanterns based on DMX512 agreement, include: the input port is respectively connected with a direct-current constant-voltage power supply and the DMX512 sub-controller; the main circuit is connected with the direct-current constant-voltage power supply through an input port and comprises a chopping module; the power supply voltage stabilizing circuit is connected with a direct-current constant-voltage power supply through an input port, the output voltage of the power supply voltage stabilizing circuit is +5V, the output end of the power supply voltage stabilizing circuit is connected with a DMX decoding chip U1, and the DMX decoding chip U1 is used for receiving DMX512 signals; the input end of the intelligent control circuit is connected with the output end of the DMX decoding chip U1, and the output end of the intelligent control circuit is connected with the chopping module; and the chopping module is connected with the two paths of LED lamps through the output port. The utility model discloses directly cascade many lamps and lanterns each other to control many lamps and lanterns by a DMX512 branch accuse ware.

Description

Constant-voltage dimming device for multi-path LED lamp based on DMX512 protocol

Technical Field

The utility model relates to a LED lamps and lanterns technical field that adjusts luminance, concretely relates to a constant voltage device of adjusting luminance for multichannel LED lamps and lanterns based on DMX512 agreement.

Background

Currently, LED dimming lamps in the market are mainly classified into two types: the LED constant voltage light regulating lamp is one common product, such as lamp belt, lamp string, etc. with light regulating module. The principle of this kind of product is as the control end by bluetooth remote controller, infrared remote controller or Wifi remote controller, and the singlechip (MCU) on the control module of adjusting luminance produces the PWM signal and controls LED lamps and lanterns to adjust luminance. However, the conventional LED constant voltage dimming lamp mainly has the following disadvantages:

1. one controller can only carry out independent dimming, and a plurality of controllers cannot carry out linkage control;

2. the conventional constant-voltage dimming lamp using the Bluetooth/infrared/wifi remote controller has poor dimming effect and obvious jitter in the dimming process;

3. the remote controller and the control module of the manufacturer need to be matched for use, and if the controllers of different manufacturers are used, the situation of incompatibility occurs.

The other is an LED constant-current dimming lamp, and common products such as bulb lamps, spot lamps, line lamps, wall washing lamps, projection lamps and the like with silicon controlled rectifier dimming, DALI dimming, 0-10V (1-10V) and PWM control power supplies. The principle of the dimming lamp is that a related control module or an IC is built in the used LED drive, and the output current is controlled through PWM chopping so as to perform dimming. However, the conventional LED constant-current dimming lamp mainly has the following disadvantages:

1. the driving conversion efficiency of the conventional silicon controlled dimming lamp is low, so that the lighting effect of the lamp is low;

2. the cost of the conventional DALI dimming and 0-10V (1-10V) dimming lamp is high;

3. the conventional silicon controlled rectifier dimming, DALI dimming and 0-10V (1-10V) have higher requirements on the compatibility of dimmers, and the compatibility problems of dimmers of different brands often occur to cause the phenomena of abnormal sound and stroboscopic of products;

4. the cascade and group control between a plurality of lamps among the conventional dimming lamps can not be generally carried out, or the dimming linkage is poor, or a conversion module is required to be additionally arranged to realize the cascade and group control functions.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a constant voltage device of adjusting luminance for multichannel LED lamps and lanterns based on DMX512 agreement to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a constant voltage dimming device for multichannel LED lamps and lanterns based on DMX512 agreement, include: the input port is respectively connected with a direct-current constant-voltage power supply and the DMX512 sub-controller; the main circuit is connected with a direct-current constant-voltage power supply through an input port and comprises a chopping module; the power supply voltage stabilizing circuit is connected with a direct-current constant-voltage power supply through an input port, the output voltage of the power supply voltage stabilizing circuit is +5V, the output end of the power supply voltage stabilizing circuit is connected with a DMX decoding chip U1, and the DMX decoding chip U1 is used for receiving a DMX512 control signal; the input end of the intelligent control circuit is connected with the output end of the DMX decoding chip U1, the output end of the intelligent control circuit is connected with the chopping module, and the intelligent control circuit comprises a main control chip U2; the chopping module is connected with the two paths of LED lamps through the output port; the first pin of the DMX decoding chip U1 is connected with the third pin of the main control chip U2, the second, third and fifth pins of the DMX decoding chip U1 are connected with a power ground, the fourth pin of the DMX decoding chip U1 is suspended, and the eighth pin of the DMX decoding chip U1 is connected with the third pin of the chip U3 of the power voltage stabilizing circuit.

In a preferred embodiment, the constant voltage dimming device further includes a signal protection circuit, the signal protection circuit is respectively connected to the DMX decoding chip U1 and the main control chip U2, and the signal protection circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a fuse F1, a fuse F2, a fuse F3, a fuse F4, a TVS tube DT1, a TVS tube DT2, a TVS tube DT3, a TVS tube DT4, one end of the TVS tube DT1, TD2, DT3, and one end of the DT4 are connected to a power ground, and the other end of the TVS tube DT1, TD2, the fuse F3, and the other end of the TVS tube DT2 are respectively connected to the fuse F3, the fuse F4, the fuse F1, and the fuse F2.

In a preferred embodiment, the sixth pin of the DMX decoding chip U1 is connected to the fuse F3 and the TVS transistor DT1, and the seventh pin of the DMX decoding chip U1 is connected to the fuse F4 and the TVS transistor DT 2.

In a preferred embodiment, the power voltage stabilizing circuit further includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a diode D1, a resistor R5 and a resistor R14, a first pin of a chip U3 of the power voltage stabilizing circuit is connected with one end of the resistor R5, one end of the resistor R14 and one end of the capacitor C4, the other ends of the resistor R5 and the resistor R14 are connected with a diode D1, the other end of the diode D1 is connected with the capacitor C5 and the capacitor C6 to the positive electrode of the dc constant voltage power supply, a third pin of a chip U3 of the power voltage stabilizing circuit is connected with the capacitor C1, the capacitor C2 and the capacitor C3 to an eighth pin of the DMX decoder chip U1 and a ninth pin of the main control chip U2, the second pin of the chip U3, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5 and the other end of the capacitor C6 of the power voltage stabilizing circuit are respectively connected to a power ground.

In a preferred embodiment, the intelligent control circuit further includes a resistor R6, a resistor R7, a capacitor C8, a capacitor C10, and a capacitor C11, the first pin of the main control chip U2 is connected to the fuse F2 and the TVS tube DT4, the main control chip U2 includes first to twentieth pins, wherein the second, fifth, sixth, tenth, twelfth, thirteenth, fourteen, fifteen, seventeen, nineteen, and twenty pins of the main control chip U2 are floating, the third pin of the main control chip U2 is connected to the first pin of the chip DMX decoding chip U1, the fourth pin of the main control chip U2 is connected to one end of the capacitor C10, and the other end of the capacitor C10 is connected to the power ground, the seventh pin of the main control chip U2 is connected to the power ground, the eighth pin of the main control chip U2 is connected to one end of the capacitor C11, and the other end of the capacitor C11 is connected to the power ground, the ninth pin of the main control chip U5 is connected to the third pin 57324 of the capacitor C8 and the third chip 58573 of the voltage regulator circuit, the other end of the capacitor C8 is connected with a power ground, an eleventh pin of the main control chip U2 is connected with the resistor R7, and the other end of the resistor R7 is connected with a third pin of the chip U3 of the power voltage stabilizing circuit.

In a preferred embodiment, the chopper module includes a resistor R, a MOS Q, a schottky diode D, and a schottky diode D, wherein one end of the resistor R is connected to the sixteenth pin of the main control chip U, one end of the resistor R, and one end of the resistor R, the other end of the resistor R is connected to the third pin of the chip U of the power voltage regulator, one end of the resistor R is connected to the sixteenth pin of the main control chip U, gates of the MOS Q and Q are connected to the resistor R and the resistor R, the other end of the resistor R is connected to the power ground, drains of the MOS Q and Q are connected to the schottky diode D and the first output port, and drains of the MOS Q and the schottky diode D are connected to the schottky diode D, and the resistor R, the resistor Q and the resistor Q are connected to the gate of the other end of the resistor R, and the gate of the resistor R are connected to the gate of the resistor Q and the gate of the resistor R, and the gate of the resistor R are connected to the gate of the diode Q, and the diode of the, The second output port is connected, and the MOS tube Q1, the MOS tube Q2, the MOS tube Q3, the source of the MOS tube Q4, the Schottky diode D2 and the Schottky diode D3 are connected to a power ground; and the sixteenth pin of the main control chip U2 is connected with one end of the resistor R10 and one end of the resistor R11, the eighteenth pin of the main control chip U2 is connected with one end of the resistor R6, and the other end of the resistor R6 is connected with the third pin of the chip U3 of the power voltage stabilizing circuit.

In a preferred embodiment, the DA signal input from the input port is connected to the DMX decoder chip U1 through the resistor R2 and the fuse F3, the DB signal input from the input port is connected to the DMX decoder chip U1 through the resistor R1 and the fuse F4, the ADRI signal input from the input port is connected to the main control chip U2 through the resistor R3, the fuse F1 and the resistor R7, and the ADRO signal input from the input port is connected to the DMX decoder chip U1 through the resistor R4 and the fuse F2.

In a preferred embodiment, the output port includes terminals P1 and P2, and terminals P1 and P2 are respectively connected to the LED light fixture.

Compared with the prior art, the utility model discloses a constant voltage device of adjusting luminance for multichannel LED lamps and lanterns based on DMX512 agreement's beneficial effect is: the utility model discloses a constant voltage dimming device is through setting up power voltage stabilizing circuit, DMX decoding chip, intelligent control circuit and chopper module to all integrate above-mentioned circuit on a PCB board, enough directly cascade many lamps and lanterns each other, and control many lamps and lanterns by a DMX512 branch accuse ware. The utility model discloses compatible standard DMX512 agreement, come control chopper module break-make in order to carry out LED lamps and lanterns constant voltage through DMX512 signal and adjust luminance, realized the monochromatic uncontrollable lamps and lanterns light and shade luminance change of constant voltage.

Drawings

Fig. 1 is a schematic block diagram of a constant voltage dimming device for a multi-channel LED lamp based on DMX512 protocol according to a preferred embodiment of the present invention.

Fig. 2 is a schematic diagram of a signal protection circuit according to a preferred embodiment of the present invention.

Fig. 3 is a schematic circuit diagram of a DMX decoding chip according to a preferred embodiment of the present invention.

Fig. 4 is a schematic diagram of a power supply voltage stabilizing circuit according to a preferred embodiment of the present invention.

Fig. 5 is a schematic diagram of an intelligent control circuit according to a preferred embodiment of the present invention.

Fig. 6 is a schematic circuit diagram of a chopper module according to a preferred embodiment of the present invention.

Fig. 7 is a schematic diagram of an output port circuit according to a preferred embodiment of the present invention.

Fig. 8 is a block diagram of a constant voltage dimming lamp system according to a preferred embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below. The embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative work, all belong to the protection scope of the present invention.

Example 1

As shown in fig. 1 to 7, the constant voltage dimming device 100 for a multi-channel LED lamp based on DMX512 protocol according to the preferred embodiment of the present invention includes: the device comprises an input port 101, a main circuit, a power supply voltage stabilizing circuit 102, a DMX decoding chip U1, an intelligent control circuit 103 and an output port 104. The input port 101 is connected to a dc constant voltage power supply 105 and a DMX512 slave (not shown in fig. 1), respectively. The main circuit is connected with a direct-current constant-voltage power supply 105 through an input port 101, the main circuit comprises a chopping module 106, the chopping module 106 is connected with two paths of LED lamps 107 through an output port 104, and the LED lamps 107 are constant-voltage single-color uncontrollable two-core lamps. The power supply voltage stabilizing circuit 102 is connected with a direct-current constant-voltage power supply 105 through an input port 101, the output end of the power supply voltage stabilizing circuit 102 is connected with a DMX decoding chip U1, and the DMX decoding chip U1 is used for receiving DMX512 signals; the input end of the intelligent control circuit 103 is connected with the output end of the DMX decoding chip U1, the output end of the intelligent control circuit 103 is connected with the chopping module, the intelligent control circuit comprises a main control chip U2, and the main control chip U2 is connected with the DMX decoding chip U1. The DMX decoding chip U1 is a MAX13085 chip, the main control chip U2 is a DMX05 chip, and both the MAX13085 chip and the DMX05 chip need to use +5V to supply power, so that the input voltage needs to be reduced to +5V by the power supply voltage stabilizing circuit 102, and the output voltage of the power supply voltage stabilizing circuit 102 is + 5V.

As shown in fig. 1-3, the constant voltage dimming device further includes a signal protection circuit, and the signal protection circuit is respectively connected to the DMX decoding chip U1 and the main control chip U2. The signal protection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a fuse F1, a fuse F2, a fuse F3, a fuse F4, a TVS tube DT1, a TVS tube DT2, a TVS tube DT3 and a TVS tube DT 4. The first pin of the DMX decoding chip U1 is connected with the third pin of the main control chip U2, the second, third and fifth pins of the DMX decoding chip U1 are connected with a power ground, the fourth pin of the DMX decoding chip U1 is suspended, the sixth pin of the DMX decoding chip U1 is connected with a fuse F3 and a TVS tube DT1, the seventh pin of the DMX decoding chip U1 is connected with the fuse F4 and the TVS tube DT2, and the eighth pin of the DMX decoding chip U1 is connected with the third pin of the chip U3 of the power voltage stabilizing circuit. One end of each of the TVS tubes DT1, TD2, DT3 and DT4 is connected to a power ground, and the other end is connected to a fuse F3, a fuse F4, a fuse F1 and a fuse F2, respectively.

As shown in fig. 1-4, the power voltage stabilizing circuit 102 further includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a diode D1, a resistor R5, and a resistor R14, wherein a first pin of a chip U3 of the power voltage stabilizing circuit is connected to one end of the resistor R5, one end of the resistor R14, and one end of the capacitor C4, the other ends of the resistor R5 and the resistor R14 are connected to a diode D1, the other end of the diode D1 is connected to the capacitor C5, and the capacitor C6 are connected to the positive electrode of the dc constant voltage power supply, a third pin of a chip U3 of the power voltage stabilizing circuit is connected to an eighth pin of the capacitor C1, the capacitor C2, and the capacitor C3 of the DMX decoder chip U1 and a ninth pin of the main controller chip U2, the second pin of the chip U3, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5 and the other end of the capacitor C6 of the power voltage stabilizing circuit are respectively connected to a power ground. The diode D1 plays a role in preventing reverse connection (when the positive and negative poles of the input are connected reversely, the circuit cannot be damaged), the resistors R14 and R5 are current-limiting resistors, and the capacitors C1, C2, C3 and C4 are filter capacitors.

As shown in fig. 1-5, the intelligent control circuit 103 further includes a resistor R6, a resistor R7, a capacitor C8, a capacitor C10, and a capacitor C11, wherein the first pin of the main control chip U2 is connected to the fuse F2 and the TVS DT4, the main control chip U2 includes first to twentieth pins, wherein the second, fifth, sixth, tenth, twelfth, thirteenth, fourteenth, fifteenth, seventeen, nineteen, and twenty pins of the main control chip U2 are floating, the third pin of the main control chip U2 is connected to the first pin of the chip DMX decoding chip U1, the fourth pin of the main control chip U2 is connected to one end of the capacitor C10, the other end of the capacitor C10 is connected to the power ground, the seventh pin of the main control chip U2 is connected to the power ground, the eighth pin of the main control chip U2 is connected to one end of the capacitor C11, the other end of the capacitor C11 is connected to the power ground, the third pin 573 of the capacitor C8 and the third pin 3 of the voltage regulator circuit U8, the other end of the capacitor C8 is connected with a power ground, an eleventh pin of the main control chip U2 is connected with a resistor R7, the other end of the resistor R7 is connected with a third pin of a chip U3 of the power voltage stabilizing circuit, a sixteenth pin of the main control chip U2 is connected with one ends of a resistor R10 and a resistor R11, an eighteenth pin of the main control chip U2 is connected with one end of a resistor R6, and the other end of the resistor R6 is connected with a third pin of a chip U3 of the power voltage stabilizing circuit.

In a preferred embodiment, the DA signal input from the input port is connected to the DMX decoder chip U1 through the resistor R2 and the fuse F3, the DB signal input from the input port is connected to the DMX decoder chip U1 through the resistor R1 and the fuse F4, the ADRI control signal input from the input port is connected to the main control chip U2 through the resistor R3, the fuse F1 and the resistor R7, and the ADRO control signal input from the input port is connected to the DMX decoder chip U1 through the resistor R4 and the fuse F2.

As shown in fig. 1-6, the chopper module 106 includes a resistor R8, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, a MOS transistor Q4, a schottky diode D2, and a schottky diode D3. Wherein, one end of the resistor R8 is connected with the sixteenth pin of the main control chip U2, one end of the resistor R10 and one end of the resistor R11, the other end of the resistor R8 is connected with the third pin of the chip U3 of the power supply voltage stabilizing circuit, one end of the resistor R11 is connected with the sixteenth pin of the main control chip U2, the gates of the MOS transistor Q1 and the MOS transistor Q3 are connected with the resistor R10 and the resistor R12, the other end of the resistor R12 is connected with the power ground, the gates of the MOS transistor Q2 and the MOS transistor Q4 are connected with the resistor R11 and the resistor R13, the other end of the resistor R13 is connected with the power ground, the drains of the MOS transistor Q1 and the MOS transistor Q3 are connected with the Schottky diode D2 and the first output port OUT1-, the drains of the MOS transistor Q2 and the MOS transistor Q4 are connected with the Schottky diode D3, and the second output port OUT 2-is connected, and the MOS tube Q1, the MOS tube Q2, the MOS tube Q3, the source of the MOS tube Q4, the Schottky diode D2 and the Schottky diode D3 are connected to the power ground.

As shown in fig. 1-7, the output port 104 includes a terminal P1 and a terminal P2, and the terminal P1 and the terminal P2 are respectively connected to the LED lamp.

Example 2

The utility model discloses a theory of operation that is used for constant voltage dimming device of multichannel LED lamps and lanterns based on DMX512 agreement specifically does:

(1) an input section: the input line of the constant voltage dimming device adopts 2 5 core wires: one of the constant voltage dimming devices is connected with a direct current constant voltage power supply and a DMX512 branch controller, wire cores are respectively V + (positive), GND (negative), DA (512 differential signal +), DB (512 differential signal-), ADI (address input), the other is connected with the next constant voltage dimming device, the wire cores are respectively V + (positive), GND (negative), DA (512 differential signal +), DB (512 differential signal-), ADO (address output), DA lines of all the constant voltage dimming devices are in parallel connection, DB lines are in parallel connection, and an address line ADO of the previous constant voltage dimming device is connected with an ADI address line of the next constant voltage dimming device.

(2) An output section: the output line of the constant voltage dimming module device adopts 2 core wires: each path of chopped output is Vo1+ (output anode 1), Vo1- (output cathode 1), Vo2+ (output anode 2) and Vo2- (output cathode 2).

(3) A power supply loop: because the DMX decoding chip U1 and the main control chip U2 need to use +5V for power supply, the input voltage needs to be reduced to +5V, specifically, the voltage needs to be reduced to +5V by using a power supply voltage stabilizing circuit. The diode D1 of the power supply voltage stabilizing circuit plays a role in preventing reverse connection (when the positive and negative electrodes of input are connected reversely, the circuit cannot be damaged), the resistors R14 and R5 are current-limiting resistors, and the capacitors C1, C2, C3 and C4 are filter capacitors.

(4) A main current loop: the constant-voltage dimming device adopts a common-anode control mode, and the current trend specifically comprises the following steps: input line positive pole-output line positive pole- (lamp panel positive pole) -lamp panel negative pole-MOS tube drain-MOS tube source-input line negative pole.

(5) Signal line protection part:

DA signal: an input line DA, a current limiting resistor R2, a fuse F3, a sixth pin of a DMX decoding chip U1;

DB Signal: an input line DB-current limiting resistor R1-fuse F4- > a seventh pin of a DMX decoding chip U1;

ADI signal: the 1 st input line ADRI-current limiting resistor R3-fuse F1-current limiting resistor R7-the eleventh pin of the main control chip U2;

ADO signal: the first pin of the main control chip U2, a fuse F2, a current limiting resistor R4 and a 2 nd input line ADRO;

the TVS tubes DT1, DT2, DT3 and DT4 carry out transient surge and electrostatic protection on 4 signal loops.

(6) The signal decoding section: because the differential signal line has a strong anti-interference function in data transmission, the signal transmission adopts differential signals for transmission. The DMX512 differential signal cable on the DMX512 sub-controller is connected to the input end of the constant voltage dimming device in a transmission manner, is connected to a sixth pin (DA) and a seventh pin (DB) of a DMX decoding chip U1 after passing through a signal protection circuit, and outputs a DMX512 protocol signal to be connected to a third pin of a main control chip U2 through a first pin of a DMX decoding chip U1 after being decoded by a DMX decoding chip U1.

(7) The intelligent control circuit part: the decoded DMX512 protocol data is connected to a third pin of a main control chip U2, the DMX512 data packet is analyzed through an algorithm in the main control chip U2, 8-bit gray value data of a current address are intercepted from the data packet, the 8-bit gray value data are converted into PWM signals through the algorithm, and the PWM signals are output to a grid electrode of an MOS tube through a sixteenth pin of the main control chip U2 so that the MOS tube is switched on and off. When the frequency of the PWM signal is fast enough (typically 3840Hz), the human eye does not see flicker because of persistence of vision. The controller adjusts the corresponding gray value and changes the duty ratio of the PWM signal after the gray value is received by the main control chip U2, so that the on-off time of the MOS tube is controlled, and the brightness of the lamp is changed. The utility model discloses a constant voltage module of adjusting luminance can be adjusted luminance for PWM output with the DMX512 signal modem of input, can realize the monochromatic uncontrollable lamps and lanterns of constant voltage light and shade luminance change to support 0% -100% luminance level and smooth regulation.

Example 3

As shown in fig. 8, the utility model also provides a constant voltage dimming lamp system of the constant voltage dimming device who uses above-mentioned embodiment, include: the LED lamp comprises a main control computer 801, a switch 802, a plurality of DMX512 sub-controllers 803, a plurality of direct current constant voltage power supplies 804, a plurality of constant voltage dimming devices 805 and a plurality of LED lamp sets 806. The input end of the switch 802 is connected to the main control machine 801, the output end of the switch 802 is connected to the plurality of DMX512 slave units 803, and the output end of each DMX512 slave unit 803 is connected to a constant voltage dimming device 804. The input line of each constant voltage dimming device 804 adopts two 5-core wires, one of the two 5-core wires is connected with a direct current constant voltage power supply and a DMX512 sub-controller, the wire cores are respectively V + (anode), GND (cathode), DA (512 differential signal +), DB (512 differential signal-), ADI (address input), the other one is connected with the next constant voltage dimming device 804, the wire cores are respectively V + (anode), GND (cathode), DA (512 differential signal +), DB (512 differential signal-), ADO (address output), the DA lines of all the constant voltage dimming devices are in parallel connection, the DB line is in parallel connection, and the address line ADO of the previous constant voltage dimming device is connected with the ADI of the next constant voltage dimming device.

In a preferred embodiment, the output line of the constant voltage dimming device 804 adopts two 2-core wires, each 2-core wire is used for outputting a PWM voltage signal, each 2-core wire is respectively connected to a constant voltage single-color uncontrollable 2-core lamp, and each 2-core wire can carry 200W lamps at maximum. The constant voltage dimming device must be powered from its input port, and the output port is directly connected to the lamp. The connecting lines among the main control machine, the exchanger, the DMX512 sub-controllers and the constant-voltage dimming device adopt a super-five shielded twisted pair 810, and the maximum distance between a signal source and the constant-voltage dimming device is not more than 100 meters.

The utility model discloses a constant voltage dimming lamp system realizes the control of whole system through the main control computer, when DMX512 branch controller sent serial port data to the main control chip of constant voltage dimming device, can realize on-line modification and upgrading the firmware of main control chip and need not tear the machine open and handle; when the DMX512 sub-controller sends DMX512 protocol data, the data is used as the lamp brightness adjustment and address writing; the DMX512 sub-controller can also send online code writing data, and high-ash high-brush firmware and low-ash non-jitter firmware are written online.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A constant voltage dimming device for a multi-path LED lamp based on a DMX512 protocol is characterized in that: the constant voltage dimming device includes:

the input port is respectively connected with a direct-current constant-voltage power supply and the DMX512 sub-controller;

the main circuit is connected with the direct-current constant-voltage power supply through the input port and comprises a chopping module;

the power supply voltage stabilizing circuit is connected with the direct-current constant-voltage power supply through the input port, the output voltage of the power supply voltage stabilizing circuit is +5V, the output end of the power supply voltage stabilizing circuit is connected with a DMX decoding chip U1, and the DMX decoding chip U1 is used for receiving a DMX512 control signal;

the input end of the intelligent control circuit is connected with the output end of the DMX decoding chip U1, the output end of the intelligent control circuit is connected with the chopping module, and the intelligent control circuit comprises a main control chip U2; and

the chopping module is connected with the two paths of LED lamps through the output port;

the first pin of the DMX decoding chip U1 is connected to the third pin of the main control chip U2, the second, third and fifth pins of the DMX decoding chip U1 are connected to a power ground, the fourth pin of the DMX decoding chip U1 is suspended, and the eighth pin of the DMX decoding chip U1 is connected to the third pin of the chip U3 of the power voltage stabilizing circuit.

2. The DMX512 protocol-based constant voltage dimming device for multi-LED lighting fixtures according to claim 1, wherein: the constant-voltage dimming device further comprises a signal protection circuit, the signal protection circuit is respectively connected with the DMX decoding chip U1 and the main control chip U2, and the signal protection circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a fuse F1, a fuse F2, a fuse F3, a fuse F4, a TVS tube DT1, a TVS tube DT2, a TVS tube DT3, a TVS tube DT4, one end of the TVS tube DT1, one end of the TD2, one end of the DT3 and one end of the DT4 are connected with a power ground, and the other end of the TVS tube DT1, one end of the TD2, one end of the DT3 and one end of the DT4 are respectively connected with the fuse F3, the fuse F4, the fuse F1 and the fuse F2.

3. The DMX512 protocol-based constant voltage dimming device for multi-LED lighting fixtures according to claim 2, wherein: the sixth pin of the DMX decoding chip U1 is connected with a fuse F3 and a TVS tube DT1, and the seventh pin of the DMX decoding chip U1 is connected with a fuse F4 and a TVS tube DT 2.

4. The DMX512 protocol-based constant voltage dimming device for multi-LED lighting fixtures according to claim 3, wherein: the power supply voltage stabilizing circuit further comprises a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C6, a diode D1, a resistor R5 and a resistor R14, wherein a first pin of a chip U3 of the power supply voltage stabilizing circuit is connected with one end of the resistor R5, one end of the resistor R14 and one end of the capacitor C4, the other ends of the resistor R5 and the resistor R14 are connected with the diode D1, the other end of the diode D1 is connected with the capacitor C5 and the capacitor C6 to the anode of the direct-current constant-voltage power supply, a third pin of a chip U3 of the power supply voltage stabilizing circuit is connected with a capacitor C1, a capacitor C2 and a capacitor C3 to an eighth pin of the DMX decoding chip U1 and a ninth pin of the main control chip U2, the second pin of the chip U3, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3, the other end of the capacitor C4, the other end of the capacitor C5 and the other end of the capacitor C6 of the power voltage stabilizing circuit are respectively connected to a power ground.

5. The DMX512 protocol-based constant voltage dimming device for multi-LED lighting fixtures according to claim 4, wherein: the intelligent control circuit further comprises a resistor R6, a resistor R7, a capacitor C8, a capacitor C10 and a capacitor C11, wherein a first pin of the main control chip U2 is connected with a fuse F2 and a TVS tube DT4, the main control chip U2 comprises first to twentieth pins, wherein second, fifth, sixth, tenth, twelfth, thirteenth, fourteenth, fifteenth, seventeen, nineteen and twenty pins of the main control chip U2 are suspended, a third pin of the main control chip U2 is connected with a first pin of a chip DMX decoding chip U1, a fourth pin of the main control chip U2 is connected with one end of the capacitor C10, the other end of the capacitor C10 is connected with a power ground, a seventh pin of the main control chip U2 is connected with the power ground, an eighth pin of the main control chip U2 is connected with one end of the capacitor C11, the other end of the capacitor C11 is connected with the power ground, a ninth pin of the main control chip U2 is connected with a ninth end of the capacitor C8 and a third pin of the power supply U3, the other end of the capacitor C8 is connected with a power ground, an eleventh pin of the main control chip U2 is connected with the resistor R7, and the other end of the resistor R7 is connected with a third pin of the chip U3 of the power voltage stabilizing circuit.

6. The DMX512 protocol-based constant voltage dimming device for multi-LED lighting fixtures according to claim 5, wherein: the chopper module comprises a resistor R8, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, a MOS tube Q4, a Schottky diode D2 and a Schottky diode D3, wherein one end of the resistor R8 is connected with a sixteenth pin of a main control chip U2, one end of the resistor R10 and one end of a resistor R11, the other end of the resistor R8 is connected with a third pin of a chip U3 of a power supply voltage stabilizing circuit, one end of the resistor R11 is connected with a sixteenth pin of a main control chip U2, a gate of the MOS tube Q1 and a gate of the MOS tube Q3 is connected with the resistor R10 and the resistor R12, the other end of the resistor R12 is connected with a power ground, a gate of the MOS tube Q2 and a gate of the MOS tube Q4 are connected with the resistor R11 and a resistor R13, the other end of the resistor R13 is connected with the power supply ground, a gate of the MOS tube Q1 and a Schottky diode Q1, and a drain of the Schottky diode 1, and a first diode Q1, and a drain of the Schottky diode 1 and a Schottky diode 1, The second output port is connected, and the MOS tube Q1, the MOS tube Q2, the MOS tube Q3, the source of the MOS tube Q4, the Schottky diode D2 and the Schottky diode D3 are connected to a power ground; and the sixteenth pin of the main control chip U2 is connected with one end of the resistor R10 and one end of the resistor R11, the eighteenth pin of the main control chip U2 is connected with one end of the resistor R6, and the other end of the resistor R6 is connected with the third pin of the chip U3 of the power voltage stabilizing circuit.

7. The DMX512 protocol-based constant voltage dimming device for multi-LED lighting fixtures according to claim 6, wherein: the DA signal input by the input port is connected with a DMX decoding chip U1 through a resistor R2 and a fuse F3, the DB signal input by the input port is connected with the DMX decoding chip U1 through a resistor R1 and a fuse F4, the ADRI signal input by the input port is connected with a main control chip U2 through a resistor R3, a fuse F1 and a resistor R7, and the ADRO signal input by the input port is connected with the DMX decoding chip U1 through a resistor R4 and a fuse F2.

8. The DMX512 protocol-based constant voltage dimming device for multi-LED lighting fixtures according to claim 1, wherein: the output port comprises a terminal P1 and a terminal P2, and the terminal P1 and the terminal P2 are respectively connected to the LED lamp.