CN112996187B - Constant voltage dimming device compatible with DMX512 protocol and constant voltage dimming lamp system - Google Patents
Constant voltage dimming device compatible with DMX512 protocol and constant voltage dimming lamp system Download PDFInfo
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- CN112996187B CN112996187B CN202110246212.8A CN202110246212A CN112996187B CN 112996187 B CN112996187 B CN 112996187B CN 202110246212 A CN202110246212 A CN 202110246212A CN 112996187 B CN112996187 B CN 112996187B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Abstract
The invention discloses a constant voltage dimming device and a constant voltage dimming lamp system compatible with DMX512 protocol, wherein the constant voltage dimming device comprises: 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 DMX512 signals; 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.
Description
Technical Field
The invention relates to the technical field of LED dimming lamps, in particular to a constant-voltage dimming device compatible with a DMX512 protocol and a constant-voltage dimming lamp system.
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. 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 rectifier 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 forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The present invention is directed to a constant voltage dimming device and a constant voltage dimming lamp system compatible with DMX512 protocol, so as to solve the problems mentioned in the background art.
In order to achieve the above object, the present invention provides a constant voltage dimming device compatible with DMX512 protocol, comprising: 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 DMX512 signals; 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.
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, 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, and a TVS tube DT4, one end of the TVS tube DT1, TD2, DT3, and DT4 is connected to a power ground, and the other end is respectively connected to the fuse F3, the fuse F4, the fuse F1, and the fuse F2.
In a preferred embodiment, 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 the power ground, the fourth pin of the DMX decoding chip U1 is suspended, the sixth pin of the DMX decoding chip U1 is connected to the fuse F3 and the TVS tube DT1, the seventh pin of the DMX decoding chip U1 is connected to the fuse F4 and the TVS tube DT2, and the eighth pin of the DMX decoding chip U1 is connected to the third pin of the power voltage stabilizing circuit chip U3.
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, 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 the diode D1, the other end of the diode D1 is connected to the capacitor C5, and the capacitor C6 are connected to an anode 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 DMX decoding chip U1 and a ninth pin of the main control chip U2, a second pin of the chip U3 of the power voltage stabilizing circuit, 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 are respectively connected to the 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 DT4, the main control chip U2 includes first to twentieth pins, wherein the second, fifth, sixth, tenth, twelfth, thirteenth, fourteenth, fifteenth, seventeenth, nineteen, and twenty pins of the main control chip U2 are suspended, 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 U2 is connected to one end of the capacitor C8 and the third pin of the power ground voltage stabilizing circuit, the other end of the capacitor C8 is connected to the third pin of the power ground, and the resistor R7 of the main control chip U2 is connected to the eleventh pin of the power stabilizing circuit.
In a preferred embodiment, the chopper module 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 to a 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 to a third pin of the chip U3 of the power supply voltage stabilizing circuit, one end of the resistor R11 is connected to a sixteenth pin of the main control chip U2, gates of the MOS transistor Q1 and the MOS transistor Q3 are connected to the resistor R10 and the resistor R12, the other end of the resistor R12 is connected to a power ground, gates of the MOS transistor Q2 and the MOS transistor Q4 are connected to the resistor R11 and the resistor R13, the other end of the resistor R13 is connected to the power ground, drains of the MOS transistor Q1 and the MOS transistor Q3 are connected to the schottky diode D2 and the first output port, drains of the MOS transistor Q2 and the schottky diode Q4 are connected to the schottky diode D2, and the schottky diode Q3, and the source of the schottky diode Q3, and the schottky diode Q3; and a sixteenth pin of the main control chip U2 is connected with one end of the resistor R10 and one end of the resistor R11, an 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 a third pin of the chip U3 of the power supply voltage stabilizing circuit.
In a preferred embodiment, the DA signal input from the input port is connected to the DMX decoding chip U1 through the resistor R2 and the fuse F3, the DB signal input from the input port is connected to the DMX decoding 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 decoding chip U1 through the resistor R4 and the fuse F2.
In a preferred embodiment, the output port includes a terminal P1 and a terminal P2, and the terminal P1 and the terminal P2 are respectively connected to the LED lamp.
The invention also provides a constant voltage dimming lamp system compatible with the DMX512 protocol, which comprises: the input end of the switch is connected with the master controller, the output end of the switch is respectively connected with the DMX512 sub-controllers, the output end of each DMX512 sub-controller is respectively connected with one constant voltage dimming device, the input line of each constant voltage dimming device adopts two 5-core wires, one constant voltage dimming device is connected with the direct current constant voltage power supply and the DMX512 sub-controllers, the other constant voltage dimming device is connected with the next constant voltage dimming device, DA signal lines of all the constant voltage dimming devices are in a parallel relation, DB signal lines of all the constant voltage dimming devices are in a parallel relation, ADO address lines of the previous constant voltage dimming device are connected with ADI address lines of the next constant voltage dimming device.
In a preferred embodiment, two 2-core wires are adopted as output lines of the constant-voltage dimming device, each 2-core wire is used for outputting a PWM voltage signal, and each 2-core wire is respectively connected with a constant-voltage single-color uncontrollable 2-core lamp; the connecting lines among the main controller, the exchanger, the DMX512 sub-controller and the constant voltage dimming device adopt a super-five shielded twisted pair, and the maximum distance between a signal source and the constant voltage dimming device is not more than 100 meters.
Compared with the prior art, the constant voltage dimming device and the constant voltage dimming lamp system compatible with the DMX512 protocol have the beneficial effects that: the constant-voltage dimming device is provided with the power supply voltage stabilizing circuit, the DMX decoding chip, the intelligent control circuit and the chopping module, integrates the circuits on the PCB, is compatible with a standard DMX512 protocol, and controls the on-off of the chopping module through a DMX512 signal to perform constant-voltage dimming on the LED lamp, so that the brightness change of a constant-voltage monochromatic uncontrollable lamp is realized. The invention can directly cascade a plurality of lamps, and the DMX512 sub-controller controls the plurality of lamps, thereby greatly improving the anti-interference capability when transmitting signals and writing codes, and realizing the online writing of high-ash high-brush firmware and low-ash non-jitter firmware.
Drawings
Fig. 1 is a schematic block diagram of a constant voltage dimming device compatible with 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 regulator circuit in accordance with a preferred embodiment of the present invention.
Fig. 5 is a schematic diagram of an intelligent control circuit in accordance with a preferred embodiment of the present invention.
Fig. 6 is a circuit schematic of a chopper module according to a preferred embodiment of the present invention.
Fig. 7 is a schematic diagram of an output port circuit of 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, and all other embodiments obtained by a person of ordinary skill in the art without any inventive work, belong to the scope of protection of the present invention.
Example 1
As shown in fig. 1 to 7, the constant voltage dimming device 100 compatible with 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 power supply, 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, 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, and a TVS tube DT4. 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 the fuse F3 and the 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 power voltage stabilizing circuit chip U3. 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 the fuse F3, the fuse F4, the fuse F1 and the 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 the diode D1, the other end of the diode D1 is connected to the capacitor C5, and the capacitor C6 is connected to an anode 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 DMX decoding chip U1 and a ninth pin of the main control chip U2, a second pin of the chip U3 of the power voltage stabilizing circuit, 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 are respectively connected to a power ground. The diode D1 plays a role of reverse connection prevention (when the input positive and negative electrodes 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, 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, seventeenth, 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 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 U2 is connected to one end of the capacitor C8 and the third pin of the power voltage stabilizing circuit U3, the other end of the capacitor C2 is connected to the power stabilizing circuit, the pin of the resistor R6 is connected to the power supply pin of the power stabilizing circuit, and the pin of the eleventh pin of the main control chip U2 is connected to the power stabilizing circuit, and the pin of the power supply circuit, the pin of the resistor R6 is connected to the power supply circuit, and the pin of the power supply circuit is connected to the power supply circuit, the pin of the chip U2, the pin of the power supply circuit, the pin of the chip U2 is connected to the pin of the resistor R6.
In a preferred embodiment, the DA signal input from the input port is connected to the DMX decoding chip U1 through the resistor R2 and the fuse F3, the DB signal input from the input port is connected to the DMX decoding 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 decoding chip U1 through the resistor R4 and the fuse F2.
As shown in fig. 1 to 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. One end of the resistor R8 is connected with a 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 a third pin of a chip U3 of the power supply voltage stabilizing circuit, one end of the resistor R11 is connected with a sixteenth pin of the main control chip U2, the grids 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 grids 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 OUT2-, the MOS transistor Q1, the MOS transistor Q2, the source of the MOS transistor Q3, the Schottky diode D2 and the source of the MOS transistor Q4 are connected with the power ground output port.
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 working principle of the constant voltage dimming device compatible with the DMX512 protocol is as follows:
(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 divider, wire cores are respectively V + (anode), GND (cathode), 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 + (anode), GND (cathode), 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 output after chopping 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, and specifically, the voltage is 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 input positive electrode and the input negative electrode are connected reversely, a 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 and a sixth pin of a DMX decoding chip U1;
DB Signal: an input line DB-a current-limiting resistor R1-a fuse F4- - > a seventh pin of the DMX decoding chip U1;
ADI signal: the 1 st input line ADRI-current limiting resistor R3-fuse F1-current limiting resistor R7-eleventh pin of 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;
TVS tubes DT1, DT2, DT3 and DT4 carry out instantaneous 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 the DMX decoding chip U1 after passing through the signal protection circuit, and outputs a DMX512 protocol signal to be connected to a third pin of the main control chip U2 through a first pin of the DMX decoding chip U1 after being decoded by the DMX decoding chip U1.
(7) The intelligent control circuit part: the decoded DMX512 protocol data is connected to a third pin of the 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 the 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 3840 Hz), the human eye does not see flicker because of persistence of vision. And after the controller adjusts the corresponding gray value and the main control chip U2 receives the gray value, the duty ratio of the PWM signal is changed, so that the on-off time of the MOS tube is controlled, and the brightness of the lamp is changed. The constant voltage dimming module can modulate and demodulate an input DMX512 signal into PWM output dimming, can realize brightness change of a constant voltage monochrome uncontrollable lamp, and supports smooth adjustment of 0-100% of brightness.
Example 3
As shown in fig. 8, the present invention further provides a constant voltage dimming lamp system compatible with DMX512 protocol, including: the system comprises a main control machine 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 to the ADI address line of the next constant voltage dimming device.
In a preferred embodiment, the output lines of the constant voltage dimming device 804 adopt two 2-core lines, each 2-core line is used for outputting a PWM voltage signal, each 2-core line is respectively connected to a constant voltage single-color uncontrollable 2-core lamp, and each line can carry 200W lamps to the maximum. The constant-voltage dimming device needs to be supplied with power from an input port of the constant-voltage dimming device, and an output port of the constant-voltage dimming device is directly connected with a 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 dimming module is not more than 100 meters.
The constant voltage dimming lamp system compatible with the DMX512 protocol realizes the control of the whole system through the main control computer, and when the DMX512 sub-controller sends serial port data to the main control chip of the constant voltage dimming device, the firmware of the main control chip can be modified and upgraded on line without disassembling the machine; 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 various 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 (9)
1. A constant voltage dimming device compatible with 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 DMX512 signals;
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 DMX decoding chip U1 adopts MAX13085, the main control chip U2 is DMX05, and the chip U3 of the power supply voltage stabilizing circuit adopts 78M05;
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 the 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 the main control chip U2, gates of the MOS tube Q1 and the MOS tube Q3 are connected with the resistor R10 and the resistor R12, the other end of the resistor R12 is connected with a power ground, gates of the MOS tube Q2 and the MOS tube Q4 are connected with the resistor R11 and the resistor R13, the other end of the resistor R13 is connected with the power supply ground, drains of the MOS tube Q1 and the MOS tube Q3 are connected with the Schottky diode D2 and a first output port, drains of the MOS tube Q2 and the Schottky diode Q4 are connected with a Schottky diode D3, a drain of the Schottky diode Q3 and a Schottky diode Q3, a source of the MOS tube Q3, and a Schottky diode Q3, a Schottky diode Q3 and a Schottky diode D3; and a sixteenth pin of the main control chip U2 is connected with one end of the resistor R10 and one end of the resistor R11, an 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 a third pin of a chip U3 of the power supply voltage stabilizing circuit.
2. The DMX512 protocol compatible constant voltage dimming device of 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, 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 DT4, one end of the TVS tube DT1, the TD2, the DT3 and the DT4 is connected with a power ground, and the other end of the TVS tube DT1, the fuse F4, the fuse F1 and the fuse F2 are respectively connected.
3. The DMX512 protocol-compatible constant voltage dimming device of claim 2, wherein: 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 the fuse F3 and the 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.
4. The DMX512 protocol-compatible constant voltage dimming device of claim 3, wherein: the power 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 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 positive electrode of the direct-current constant-voltage power supply, a third pin of the chip U3 of the power voltage stabilizing circuit is connected with an eighth pin of the DMX decoding chip U1 and a ninth pin of the main control chip U2, and a second pin of the chip U3 of the power voltage stabilizing circuit, 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 are respectively connected to a power ground.
5. The DMX512 protocol compatible constant voltage dimming device of 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 the fuse F2 and the TVS tube DT4, the main control chip U2 comprises a first pin to a twentieth pin, 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 the first pin of the 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 one end of the capacitor C8 and a third pin of the chip U3 of the power ground, the other end of the capacitor C8 is connected with a voltage stabilizing circuit, the pin of the resistor R7 is connected with the power ground, and the other end of the resistor U3 is connected with the third pin of the resistor U7.
6. The DMX512 protocol-compatible constant voltage dimming device of claim 5, wherein: the DA signal input by the input port is connected with the DMX decoding chip U1 through the resistor R2 and the fuse F3, the DB signal input by the input port is connected with the DMX decoding chip U1 through the resistor R1 and the fuse F4, the ADRI signal input by the input port is connected with the main control chip U2 through the resistor R3, the fuse F1 and the resistor R7, and the ADRO signal input by the input port is connected with the DMX decoding chip U1 through the resistor R4 and the fuse F2.
7. The DMX512 protocol compatible constant voltage dimming device of 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.
8. The utility model provides a compatible DMX512 agreement's constant voltage lamp system of adjusting luminance which characterized in that: the constant voltage dimming lamp system includes: a main control machine, a switch, a plurality of DMX512 sub-controllers, a plurality of DC constant voltage power supplies, a plurality of constant voltage dimming devices as claimed in any one of claims 1 to 7, and a plurality of LED lamp sets, wherein the input end of the switch is connected to the main control machine, the output end of the switch is connected to the plurality of DMX512 sub-controllers, the output end of each DMX512 sub-controller is connected to one of the constant voltage dimming devices, the input line of each constant voltage dimming device is made of two 5-core wires, one of the two 5-core wires is connected to the DC constant voltage power supply and the DMX512 sub-controller, the other is connected to the next constant voltage dimming device, the DA signal lines of all constant voltage dimming devices are in parallel, the DB signal lines of all constant voltage dimming devices are in parallel, and the ADO address line of the previous constant voltage dimming device is connected to the ADI address line of the next constant voltage dimming device.
9. The constant voltage dimming lamp system as claimed in claim 8, wherein: the output line of the constant-voltage dimming device adopts two 2-core wires, each 2-core wire is used for outputting a PWM voltage signal, and each 2-core wire is respectively connected with a constant-voltage single-color uncontrollable 2-core lamp; the connecting lines among the main control machine, the switchboard, the DMX512 sub-controllers and the constant-voltage dimming device adopt a super-five shielded twisted pair, and the maximum distance between a signal source and the constant-voltage dimming device is not more than 100 meters.
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|---|---|---|---|---|
| CN201837859U (en) * | 2010-09-14 | 2011-05-18 | 镇江市旋丽电器有限公司 | Smart glass controller |
| CN105792424A (en) * | 2016-04-13 | 2016-07-20 | 大连工业大学 | Controller based on DMX512 protocol |
| CN207969033U (en) * | 2018-04-03 | 2018-10-12 | 上海中天照明成套有限公司 | A kind of Novel LED lamp DMX signals decoding constant current output driver |
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| TWI470942B (en) * | 2010-07-30 | 2015-01-21 | My Semi Inc | Driver circuit of light emitting diode, decoding circuit and decoding method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201837859U (en) * | 2010-09-14 | 2011-05-18 | 镇江市旋丽电器有限公司 | Smart glass controller |
| CN105792424A (en) * | 2016-04-13 | 2016-07-20 | 大连工业大学 | Controller based on DMX512 protocol |
| CN207969033U (en) * | 2018-04-03 | 2018-10-12 | 上海中天照明成套有限公司 | A kind of Novel LED lamp DMX signals decoding constant current output driver |
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