CN204291487U - Based on the LED automatic addressing circuit of DMX512, light fixture and system - Google Patents

Abstract

The utility model is applicable to the field of LED lighting, and provides an LED automatic addressing circuit, a lamp and a system based on the DMX512 protocol. The circuit includes: a processing unit; The unit, its differential input end is connected with the two normally closed output ends of the address coding control unit, its output end is connected with the signal receiving end of the processing unit, and its control end is connected with the processing unit; the second conversion unit, its input end is connected with the processing unit The signal sending end is connected, the differential output end is connected with the two normally open input ends of the address coding control unit, and the control end is connected with the processing unit. The utility model makes the LED lamps in the state of parallel connection or series connection by controlling the address coding control unit, and realizes the drive through the conversion unit in the series state, and then realizes the automatic addressing control through the accumulation address of the processing unit, and the operation is intelligent.

Description

LED automatic addressing circuit, lamps and system based on DMX512

technical field

The utility model belongs to the field of LED lighting, in particular to an LED automatic addressing circuit based on the DMX512 protocol, an LED lamp and an LED lighting control system.

Background technique

In today's era, under the background of rising concerns about global energy shortages, energy conservation is an important issue facing us in the future. LED light-emitting products are widely used in the field of lighting due to their long life, low heat generation, energy saving and environmental protection. LED is also known as a new type of green light source product. With the development of technology, LED lighting fixtures are expanding their application range at a faster speed.

At present, many LED lighting products controlled by the international standard DMX512 protocol have appeared on the market, mainly used for landscape lighting, stage lighting, etc. The address coding method of this series of products is to adjust the address through the key circuit on the lamp, and adjust the address 1 to 512 of the lamp through an external key circuit on the lamp, then save it in the memory chip, and display the address information through the LED digital tube.

However, the addressing method of this product needs to manually adjust each DMX512 protocol LED lamp, which is cumbersome and takes a long time to operate. Moreover, since the addresses of all LED lamps on a group of DMX512 channels cannot be repeated, it is not Conducive to product installation and maintenance.

Utility model content

The purpose of the embodiment of the present invention is to provide an automatic addressing circuit for LED lamps based on the DMX512 protocol, aiming at solving the problem of cumbersome operation and long operation time caused by manual keystroke addressing control in the LED lamps of the DMX512 protocol standard. question.

The embodiment of the utility model is realized in this way, a LED automatic addressing circuit based on the DMX512 protocol, its differential transmission end is connected to the sub-controller through the bus, and its output end is connected to the LED lamp. The automatic addressing circuit includes:

A processing unit that generates switching control signals, conversion control signals and drive control signals, the output of the processing unit is the output of the automatic addressing circuit;

Receive the DMX512 lamp control signal, and convert the DMX512 lamp control signal into a differential detection signal according to the switching control signal, so that multiple LED lamps are connected in parallel to the address coding control unit on the bus, and the control terminal of the address coding control unit is connected to the The third universal input and output (I/O) of the processing unit is connected, and the common end of the address coding control unit is the differential transmission end of the automatic addressing circuit;

A first conversion unit that converts the differential detection signal into a TTL detection signal according to the conversion control signal, the differential input terminal of the first conversion unit is connected to the two normally closed output terminals of the address encoding control unit, and the first conversion unit The output terminal of the conversion unit is connected to the signal receiving terminal (RXD) of the processing unit, and the control terminal of the first conversion unit is connected to the first general input and output terminal (H/L) of the processing unit;

A second conversion unit that converts the TTL drive control signal into a differential drive control signal according to the conversion control signal, the input terminal of the second conversion unit is connected to the signal transmission terminal (TXD) of the processing unit, and the second The differential output terminal of the conversion unit is connected to the two normally open input terminals of the address coding control unit, so that the address coding control unit receives the differential driving control signal according to the switching control signal, so that a plurality of LED lamps are connected in series to the On the bus, the control terminal of the second conversion unit is connected to the second general input and output terminal (H/L) of the processing unit.

Further, the first conversion unit is a first RS485 communication module, the two data terminals of the first RS485 communication module are differential input terminals of the first conversion unit, and the output terminals of the first RS485 communication module are The output terminal of the first conversion unit, the reset terminal of the first RS485 communication module is the control terminal of the first conversion unit;

The second conversion unit is a second RS485 communication module, the input end of the second RS485 communication module is the input end of the second conversion unit, and the two data ends of the second RS485 communication module are the second The differential output terminal of the conversion unit, the reset terminal of the first RS485 communication module is the control terminal of the first conversion unit.

Further, the first conversion unit also includes:

Bidirectional TVS regulator Z1, bidirectional TVS regulator Z2, resistor R1, resistor R2, resistor R4, resistor R5;

One of the two data ends of the first RS485 communication module is respectively connected to the first end of the bidirectional TVS regulator Z1, one end of the resistor R1 and one end of the resistor R2, and the bidirectional TVS regulator The second end of Z1 and the other end of the resistor R1 are simultaneously grounded, and the other end of the resistor R2 is a differential input end of the first conversion unit;

The other of the two data ends of the first RS485 communication module is respectively connected to the first end of the bidirectional TVS voltage regulator tube Z2, one end of the resistor R5 and one end of the resistor R4, and the bidirectional TVS regulator The second end of the tube Z2 and the other end of the resistor R5 are simultaneously grounded, and the other end of the resistor R4 is the other differential input end of the first conversion unit;

The second conversion unit also includes:

Bidirectional TVS regulator Z3, bidirectional TVS regulator Z4, resistor R6, resistor R8, resistor R9, resistor R11;

One of the two data ends of the second RS485 communication module is respectively connected to the first end of the bidirectional TVS regulator Z4, one end of the resistor R6 and one end of the resistor R8, and the bidirectional TVS regulator The second end of Z4 and the other end of the resistor R6 are simultaneously grounded, and the other end of the resistor R8 is a differential input end of the first conversion unit;

The other of the two data ends of the second RS485 communication module is respectively connected to the first end of the bidirectional TVS voltage regulator tube Z5, one end of the resistor R11 and one end of the resistor R9, and the bidirectional TVS voltage regulator The second end of the tube Z5 and the other end of the resistor R11 are grounded simultaneously, and the other end of the resistor R9 is the other differential input end of the first conversion unit.

Further, the first RS485 communication module includes:

Capacitor C1, resistor R3 and MAX1487 type communication chip (U1);

The power supply end of the MAX1487 type communication chip (U1) is connected to the power supply voltage, and grounded through the capacitor C1, and the reset end and the transceiver control end (DE) of the MAX1487 type communication chip (U1) are simultaneously the first RS485 The control end of the communication module is grounded through the resistor R3, the output end of the MAX1487 type communication chip (U1) is the output end of the first RS485 communication module, and the two data ends of the MAX1487 type communication chip (U1) are the Describe the two data terminals of the first RS485 communication module;

The second RS485 communication module includes:

Capacitor C2 and MAX1487 type communication chip (U2);

The power supply end of the MAX1487 type communication chip (U2) is connected to the power supply voltage, and grounded through the capacitor C2, and the reset end and the transceiver control end (DE) of the MAX1487 type communication chip (U2) are simultaneously the second RS485 The control terminal of the communication module, the input terminal (DI) of the MAX1487 type communication chip (U2) is the input terminal of the second RS485 communication module, and the two data terminals of the MAX1487 type communication chip (U2) are the second Two data terminals of the RS485 communication module.

Further, the address encoding control unit includes:

Resistor R7, resistor R10, diode D1, first switching tube Q1 and dual relay;

One end of the resistor R7 is the control end of the address coding control unit, the other end of the resistor R7 is connected to one end of the resistor R10 and the control end of the first switch tube at the same time, and the other end of the resistor R10 is One end is grounded simultaneously with the output end of the first switch tube, the input end of the first switch tube is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the power supply end of the address coding control unit voltage, the anode and cathode of the diode D1 are also connected to the two ends of the coil of the dual relay, the two normally closed terminals of the dual relay are the two normally closed output terminals of the address coding control unit, and the dual The two normally open terminals of the one-way relay are the normally open input terminals of the address coding control unit, and the two common terminals of the two-way relay are the common terminals of the address coding control unit.

Furthermore, the first switch tube is an NPN transistor;

The collector of the NPN transistor is the input terminal of the first switch, the base of the NPN transistor is the control terminal of the first switch, and the emitter of the NPN transistor is the first switch. output end of the tube.

Further, the automatic addressing circuit also includes:

An output port (POUT) for easy insertion, the output port is connected to the differential transmission end of the automatic addressing circuit.

Further, the automatic addressing circuit also includes:

A DC stabilized power supply, used to provide a stable power supply voltage, the output terminals of the DC stabilized power supply are respectively connected to the processing unit, the first conversion unit, the second conversion unit, and the address code control Unit's power terminal connection.

Another object of the embodiment of the present utility model is to provide an LED lamp adopting the above-mentioned LED automatic addressing circuit based on the DMX512 protocol.

Another object of the embodiment of the present invention is to provide an LED lighting control system based on the DMX512 protocol. The LED lighting control system includes a host computer, a master controller connected to the host computer, and multiple The sub-controller connected to the controller and the above-mentioned LED lamps based on the DMX512 protocol.

In the embodiment of the utility model, multiple LED lamps are placed in parallel or in series by controlling the address coding control unit, and in the serial state, the drive control signal and the addressing signal are received through the conversion unit, and the LED lamp is realized by adding the address through the processing unit. Automatic addressing control, the circuit does not need manual operation, which greatly improves the addressing efficiency of LED lamps, makes the product more intelligent, and the circuit is simple, which is convenient for product installation and maintenance.

Description of drawings

Fig. 1 is the structural diagram of the LED automatic addressing circuit based on DMX512 agreement that the utility model embodiment provides;

Fig. 2 is an example circuit structure diagram of the first and second switching units in the LED automatic addressing circuit based on the DMX512 protocol provided by the embodiment of the present invention;

Fig. 3 is an example circuit structure diagram of the address coding control unit in the LED automatic addressing circuit based on the DMX512 protocol provided by the embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Embodiment of the utility model.

Below in conjunction with specific embodiment the realization of the utility model is described in detail:

Fig. 1 shows the structure of the LED automatic addressing circuit based on the DMX512 protocol provided by the embodiment of the utility model. For the convenience of description, only the parts related to the utility model are shown.

As an embodiment of the utility model, the LED automatic addressing circuit based on the DMX512 protocol can be applied to any LED lamp and LED lighting control system.

As an embodiment of the present invention, the differential transmission end of the LED automatic addressing circuit 1 based on the DMX512 protocol is connected to the sub-controller 5 through the bus, and its output end is connected to the LED lamp 2, including:

The processing unit 11 generates a switching control signal, a conversion control signal and a drive control signal, and the output end of the processing unit 11 is the output end of the automatic addressing circuit;

The address code control unit 13 is used to receive the DMX512 lamp control signal, and convert the DMX512 lamp control signal into a differential detection signal according to the switching control signal, so that multiple LED lamps are connected in parallel on the bus. The control terminal of the address code control unit 13 is connected to the The third universal input and output terminal (I/O) of processing unit 11 is connected, and the common terminal of address encoding control unit 13 is the differential transmission terminal of automatic addressing circuit;

The first conversion unit 12A is used to convert the differential detection signal into a TTL (Transistor-Transistor Logic) detection signal according to the conversion control signal, the differential input terminal of the first conversion unit 12A and the two normally closed output terminals of the address coding control unit 13 Connect, the output terminal of the first conversion unit 12A is connected with the signal receiving terminal (RXD) of the processing unit 11, and the control terminal of the first conversion unit 12A is connected with the first universal input and output terminal (H/L) of the processing unit 11;

The second conversion unit 12B is used to convert the TTL drive control signal into a differential drive control signal according to the conversion control signal. The input terminal of the second conversion unit 12B is connected to the signal transmission terminal (TXD) of the processing unit 11, and the second conversion unit The differential output terminal of 12B is connected to the two normally open input terminals of the address coding control unit 13, so that the address coding control unit 13 receives the differential drive control signal according to the switching control signal, so that a plurality of LED lamps 2 are connected in series on the bus, and the second switching The control terminal of the unit 12B is connected to the second general-purpose input and output terminal (H/L) of the processing unit 11 .

In the embodiment of the present utility model, when in the initial state, the address coding control unit 13 is placed at the normally closed end by default, and is connected with the first conversion unit 12A to convert the DMX512 lamp control signal into a differential detection signal. The first conversion unit 12A In the initial state, by default, the differential detection signal is converted into a TTL detection signal and sent to the processing unit 11. The processing unit 11 extracts the control command from the converted DMX512 lamp control signal, and then generates the switching control signal, conversion control signal and drive control signal. , and then respectively control the address coding control unit 13, the first conversion unit 12A and the second conversion unit 12B.

In the embodiment of the present utility model, the processing unit 11 generates a switch control signal after receiving the converted DMX512 lamp control signal, and the address coding control unit 13 converts the DMX512 lamp control signal received from the sub-controller 5 into A differential detection signal, the differential signal is converted into a TTL detection signal by the first conversion unit 12A and then output to the processing unit 11 for decoding to identify whether the DMX512 control signal contains an address coding command. When it is recognized that the DMX512 control signal contains an address coding command After confirming the local address, the conversion control signal is generated again to control the address coding control unit 13 to enter the normally open state, and the differential drive control signal is received to connect a plurality of LED lamps 2 in series on the bus. At the same time, the processing unit 11 converts the local Adding 1 to the machine address converts the TTL drive control signal into a differential drive control signal through the second conversion unit 12B, and outputs it to the address coding control unit 13 to be completed by the next LED lamp.

In the embodiment of the present utility model, after the processing unit 11 decodes the DMX512 control signal, if the DMX512 control signal contains an address coding command, then the drive control signal and the addressing signal can be obtained, and when the addressing signal is not received, the processing Unit 11 generates a conversion control signal to control the first conversion unit to be in a signal receiving state, and controls the address coding control unit 13 to be in a normally closed state through the generated switching control signal, so that all LED lamps 2 are in a parallel state on the DMX512 bus; The lamps 2 are in the parallel state when they do not receive the addressing signal. After all the LED lamps 2 connected in parallel on the DMX512 bus receive the addressing signal, the processing unit 11 controls the address coding control unit 13 to switch to the normal mode through the generated switching control signal. In the open state, all LED lamps 2 are in series mode, and the differential transmission terminals AO+ and BO- are turned on. Only when the first lamp from the DMX512 control signal receives the drive control signal decoded from the DMX512 control signal, the address 1 will be obtained. , and then add 1 to the address through the processing unit 11 and send it to the second lamp, and so on, the automatic encoding is completed until the last lamp is automatically encoded;

In addition, in the initial state, it is considered that the LED lamps 2 are in a parallel state.

In the embodiment of the present utility model, after receiving the conversion control signal output by the processing unit 11, the first conversion unit 12A and the second conversion unit 12B realize the conversion between the differential signal and the TTL signal, and the processing unit 11 passes two channels The conversion unit realizes the transmission of driving control signals and address signals to and from the LED lamp 2 , so as to drive the LED lamp 2 .

In the embodiment of the utility model, multiple LED lamps are placed in parallel or in series by controlling the address coding control unit, and in the serial state, the drive control signal and the addressing signal are received through the conversion unit, and the LED lamp is realized by adding the address through the processing unit. Automatic addressing control, the circuit does not need manual operation, which greatly improves the addressing efficiency of LED lamps, makes the product more intelligent, and the circuit is simple, which is convenient for product installation and maintenance.

Fig. 2 shows an example circuit structure of the first and second switching units in the LED automatic addressing circuit based on the DMX512 protocol provided by the embodiment of the present invention. For the convenience of illustration, only the parts related to the present invention are shown.

As an embodiment of the present utility model, the first converting unit 12A may adopt a first RS485 communication module;

Wherein, the two data terminals of the first RS485 communication module are differential input terminals of the first conversion unit 12A, the output terminal of the first RS485 communication module is the output terminal of the first conversion unit 12A, and the reset terminal of the first RS485 communication module is the first conversion unit 12A. A control terminal of the converting unit 12A;

Preferably, the first conversion unit 12A further includes:

Bidirectional TVS regulator Z1, bidirectional TVS regulator Z2, resistor R1, resistor R2, resistor R4, resistor R5;

One of the two data ends of the first RS485 communication module is respectively connected to the first end of the bidirectional TVS voltage regulator Z1, one end of the resistor R1 and one end of the resistor R2, and the second end of the bidirectional TVS voltage regulator Z1 is connected to the other end of the resistor R1. One end is grounded at the same time, and the other end of the resistor R2 is a differential input end of the first conversion unit 12A;

The other of the two data ends of the first RS485 communication module is respectively connected with the first end of the bidirectional TVS voltage regulator Z2, one end of the resistor R5 and one end of the resistor R4, and the second end of the bidirectional TVS voltage regulator Z2 is connected with the resistor R5. The other end is grounded at the same time, and the other end of the resistor R4 is the other differential input end of the first converting unit 12A.

As an embodiment of the present utility model, the second converting unit 12B may adopt a second RS485 communication module;

Wherein, the input terminal of the second RS485 communication module is the input terminal of the second conversion unit 12B, the two data terminals of the second RS485 communication module are the differential output terminals of the second conversion unit 12B, and the reset terminal of the first RS485 communication module is the second conversion unit 12B. A control terminal of the conversion unit 12A.

Preferably, the second converting unit 12B further includes:

Bidirectional TVS regulator Z3, bidirectional TVS regulator Z4, resistor R6, resistor R8, resistor R9, resistor R11;

One of the two data ends of the second RS485 communication module is respectively connected with the first end of the bidirectional TVS voltage regulator tube Z4, one end of the resistor R6 and one end of the resistor R8, and the second end of the bidirectional TVS voltage regulator tube Z4 is connected with the other end of the resistor R6. One end is grounded at the same time, and the other end of the resistor R8 is a differential input end of the first conversion unit 12A;

The other of the two data ends of the second RS485 communication module is respectively connected to the first end of the bidirectional TVS voltage regulator Z5, one end of the resistor R11 and one end of the resistor R9, and the second end of the bidirectional TVS voltage regulator Z5 is connected to the end of the resistor R11. The other end is grounded at the same time, and the other end of the resistor R9 is the other differential input end of the first conversion unit 12A.

As a preferred embodiment of the present utility model, the first RS485 communication module includes:

Capacitor C1, resistor R3 and MAX1487 type communication chip (U1);

The power supply end of the MAX1487 type communication chip (U1) is connected to the power supply voltage VCC, and grounded through the capacitor C1, and the reset end and the transceiver control (RE/DE) of the MAX1487 type communication chip (U1) are simultaneously the control end of the first RS485 communication module through The resistance R3 is grounded, the output end of the MAX1487 type communication chip (U1) is the output end of the first RS485 communication module, and the two data ends of the MAX1487 type communication chip (U1) are the two data ends of the first RS485 communication module;

The second RS485 communication module includes:

Capacitor C2 and MAX1487 type communication chip (U2);

The power supply end of the MAX1487 communication chip (U2) is connected to the power supply voltage VCC, and is grounded through the capacitor C2. The reset terminal and the transceiver control (RE/DE) of the MAX1487 communication chip (U2) are simultaneously the control terminals of the second RS485 communication module. The input terminal (DI) of the MAX1487 communication chip (U2) is the input terminal of the second RS485 communication module, and the two data terminals of the MAX1487 communication chip (U2) are the two data terminals of the second RS485 communication module.

In the embodiment of the utility model, Z1, Z2 and Z4, Z5 serve the purpose of protecting the first RS485 communication module and the second RS485 communication module.

The first conversion circuit 12A is bidirectionally connected to the processing unit 11 through the serial ports RXD and TXD of the processing unit 11 , and the second conversion circuit 12B is unidirectionally connected to the processing unit 11 through the serial port TXD of the processing unit 11 .

Fig. 3 shows an example circuit structure of the address coding control unit in the LED automatic addressing circuit based on the DMX512 protocol provided by the embodiment of the present invention. For the convenience of description, only the parts related to the present invention are shown.

As an embodiment of the present utility model, the address coding control unit 13 includes:

Resistor R7, resistor R10, diode D1, first switch tube Q1 and dual relay RL1;

One end of the resistor R7 is the control end of the address coding control unit 13, the other end of the resistor R7 is connected with one end of the resistor R10 and the control end of the first switching tube Q1 at the same time, and the other end of the resistor R10 is connected with the output end of the first switching tube Q1 At the same time, it is connected to ground, the input end of the first switch tube Q1 is connected to the anode of the diode D1, the cathode of the diode D1 is connected to the power supply voltage for the power supply end of the address coding control unit 13, and the anode and cathode of the diode D1 are also connected to the coil of the two-way relay RL1 The two ends (P1, P2) are connected, the two normally closed terminals (P5, P6) of the double-way relay RL1 are the two normally-closed output terminals (Ai+, Bi-) of the address coding control unit 13, and the two normally-open terminals of the double-way relay RL1 (P7, P8) are the normally open input terminals (A2+, B2-) of the address encoding control unit 13, and the two common terminals (P3, P4) of the two-way relay RL1 are the common terminals (Ao+, Bo-) of the address encoding control unit 13 ).

Preferably, the first switch tube is an NPN transistor;

The collector of the NPN transistor is the input terminal of the first switch tube, the base of the NPN transistor is the control terminal of the first switch tube, and the emitter of the NPN transistor is the output terminal of the first switch tube.

As a preferred embodiment of the present invention, the automatic addressing circuit may also include:

An output port (POUT) for easy plugging, the output port is connected with the differential transmission end of the automatic addressing circuit.

As a preferred embodiment of the present invention, the automatic addressing circuit may also include:

The DC stabilized power supply is used to provide a stable power supply voltage. The output terminals of the DC stabilized power supply are respectively connected to the power terminals of the processing unit 11 , the first conversion unit 12A, the second conversion unit 12B, and the address coding control unit 13 .

In the embodiment of the utility model, the resistor R7 and the resistor R10 form the base control terminal of the first switching tube Q1, and the processing unit 11 controls the conduction of the first switching tube Q1 by switching the control signal, and then controls the power-off of the coil The two sets of switches of the two-way relay RL1 are closed or disconnected. Among them, the diode D3 prevents overcurrent, and the common terminals Ao+ and Bo- of the relay RL1 are connected to the sub-controller as differential transmission terminals. In addition, Ai+, Bi- and A2+, B2- It realizes parallel and series switching of signals.

Another object of the embodiment of the present utility model is to provide an LED lamp adopting the above-mentioned LED automatic addressing circuit based on the DMX512 protocol. as well as

A LED lighting control system based on DMX512 protocol, the system includes:

The upper computer 3, the main controller 4 connected to the upper computer 3, the multiple sub-controllers 5 connected to the main controller 4, and the LED automatic addressing circuit 1 and LED lamps 2 based on the DMX512 protocol in the above embodiment.

In the embodiment of the present utility model, the computer host computer 3 has built-in control software, configures the main controller 4 through the Ethernet interface, and sends the lighting control signal and lamp display data to the main controller 4 . The main controller 4 distributes the corresponding data to each DMX512 sub-controller 5 after processing the received data information. The DMX512 sub-controller 5 generates a standard DMX512 control signal according to the received signal, and sends the DMX512 control signal through the RS485 bus. Of course, the bus Multiple lamps can be mounted on it, and the lamps intercept corresponding control signals from the RS485 bus according to their preset addresses to complete relevant control operations.

In the embodiment of the utility model, multiple LED lamps are placed in parallel or in series by controlling the address coding control unit, and in the serial state, the drive control signal and the addressing signal are received through the conversion unit, and the LED lamp is realized by adding the address through the processing unit. Automatic addressing control, the circuit does not need manual operation, which greatly improves the addressing efficiency of LED lamps, makes the product more intelligent, and the circuit is simple, which is convenient for product installation and maintenance.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model should be included in the utility model. within the scope of protection.

Claims (10)

1. A kind of LED automatic addressing circuit based on DMX512 protocol, its differential transmission end is connected with sub-controller by bus, and its output terminal is connected with LED light fixture, it is characterized in that, described automatic addressing circuit comprises: A processing unit that generates switching control signals, conversion control signals and drive control signals, the output of the processing unit is the output of the automatic addressing circuit; Receive the DMX512 lamp control signal, and convert the DMX512 lamp control signal into a differential detection signal according to the switching control signal, so that multiple LED lamps are connected in parallel to the address coding control unit on the bus, and the control terminal of the address coding control unit is connected to the The third universal input and output (I/O) of the processing unit is connected, and the common end of the address coding control unit is the differential transmission end of the automatic addressing circuit; A first conversion unit that converts the differential detection signal into a TTL detection signal according to the conversion control signal, the differential input terminal of the first conversion unit is connected to the two normally closed output terminals of the address encoding control unit, and the first conversion unit The output terminal of the conversion unit is connected to the signal receiving terminal (RXD) of the processing unit, and the control terminal of the first conversion unit is connected to the first general input and output terminal (H/L) of the processing unit; A second conversion unit that converts the TTL drive control signal into a differential drive control signal according to the conversion control signal, the input terminal of the second conversion unit is connected to the signal transmission terminal (TXD) of the processing unit, and the second The differential output terminal of the conversion unit is connected to the two normally open input terminals of the address coding control unit, so that the address coding control unit receives the differential driving control signal according to the switching control signal, so that a plurality of LED lamps are connected in series to the On the bus, the control terminal of the second conversion unit is connected to the second general input and output terminal (H/L) of the processing unit. 2. automatic addressing circuit as claimed in claim 1, is characterized in that, described first conversion unit is the first RS485 communication module, and two data ends of described first RS485 communication module are the first conversion unit A differential input terminal, the output terminal of the first RS485 communication module is the output terminal of the first conversion unit, and the reset terminal of the first RS485 communication module is the control terminal of the first conversion unit; The second conversion unit is a second RS485 communication module, the input end of the second RS485 communication module is the input end of the second conversion unit, and the two data ends of the second RS485 communication module are the second The differential output terminal of the conversion unit, the reset terminal of the first RS485 communication module is the control terminal of the first conversion unit. 3. automatic addressing circuit as claimed in claim 2, is characterized in that, described first conversion unit also comprises: Bidirectional TVS regulator Z1, bidirectional TVS regulator Z2, resistor R1, resistor R2, resistor R4, resistor R5; One of the two data ends of the first RS485 communication module is respectively connected to the first end of the bidirectional TVS regulator Z1, one end of the resistor R1 and one end of the resistor R2, and the bidirectional TVS regulator The second end of Z1 and the other end of the resistor R1 are simultaneously grounded, and the other end of the resistor R2 is a differential input end of the first conversion unit; The other of the two data ends of the first RS485 communication module is respectively connected to the first end of the bidirectional TVS voltage regulator tube Z2, one end of the resistor R5 and one end of the resistor R4, and the bidirectional TVS regulator The second end of the tube Z2 and the other end of the resistor R5 are simultaneously grounded, and the other end of the resistor R4 is the other differential input end of the first conversion unit; The second conversion unit also includes: Bidirectional TVS regulator Z3, bidirectional TVS regulator Z4, resistor R6, resistor R8, resistor R9, resistor R11; One of the two data ends of the second RS485 communication module is respectively connected to the first end of the bidirectional TVS regulator Z4, one end of the resistor R6 and one end of the resistor R8, and the bidirectional TVS regulator The second end of Z4 and the other end of the resistor R6 are simultaneously grounded, and the other end of the resistor R8 is a differential input end of the first conversion unit; The other of the two data ends of the second RS485 communication module is respectively connected to the first end of the bidirectional TVS voltage regulator tube Z5, one end of the resistor R11 and one end of the resistor R9, and the bidirectional TVS voltage regulator The second end of the tube Z5 and the other end of the resistor R11 are grounded simultaneously, and the other end of the resistor R9 is the other differential input end of the first conversion unit. 4. automatic addressing circuit as claimed in claim 2 or 3, is characterized in that, described first RS485 communication module comprises: Capacitor C1, resistor R3 and MAX1487 type communication chip (U1); The power supply end of the MAX1487 type communication chip (U1) is connected to the power supply voltage, and grounded through the capacitor C1, and the reset end and the transceiver control end (DE) of the MAX1487 type communication chip (U1) are simultaneously the first RS485 The control end of the communication module is grounded through the resistor R3, the output end of the MAX1487 type communication chip (U1) is the output end of the first RS485 communication module, and the two data ends of the MAX1487 type communication chip (U1) are the Describe the two data terminals of the first RS485 communication module; The second RS485 communication module includes: Capacitor C2 and MAX1487 type communication chip (U2); The power supply end of the MAX1487 type communication chip (U2) is connected to the power supply voltage, and grounded through the capacitor C2, and the reset end and the transceiver control end (DE) of the MAX1487 type communication chip (U2) are simultaneously the second RS485 The control terminal of the communication module, the input terminal (DI) of the MAX1487 type communication chip (U2) is the input terminal of the second RS485 communication module, and the two data terminals of the MAX1487 type communication chip (U2) are the second Two data terminals of the RS485 communication module. 5. automatic addressing circuit as claimed in claim 1, is characterized in that, described address coding control unit comprises: Resistor R7, resistor R10, diode D1, first switching tube Q1 and dual relay; One end of the resistor R7 is the control end of the address coding control unit, the other end of the resistor R7 is connected to one end of the resistor R10 and the control end of the first switch tube at the same time, and the other end of the resistor R10 is One end is grounded simultaneously with the output end of the first switch tube, the input end of the first switch tube is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the power supply end of the address coding control unit voltage, the anode and cathode of the diode D1 are also connected to the two ends of the coil of the dual relay, the two normally closed terminals of the dual relay are the two normally closed output terminals of the address coding control unit, and the dual The two normally open terminals of the one-way relay are the normally open input terminals of the address coding control unit, and the two common terminals of the two-way relay are the common terminals of the address coding control unit. 6. The automatic addressing circuit as claimed in claim 5, wherein the first switching tube is an NPN transistor; The collector of the NPN transistor is the input terminal of the first switch, the base of the NPN transistor is the control terminal of the first switch, and the emitter of the NPN transistor is the first switch. output end of the tube. 7. automatic addressing circuit as claimed in claim 1, is characterized in that, described automatic addressing circuit also comprises: An output port (POUT) for easy insertion, the output port is connected to the differential transmission end of the automatic addressing circuit. 8. automatic addressing circuit as claimed in claim 1, is characterized in that, described automatic addressing circuit also comprises: A DC stabilized power supply, used to provide a stable power supply voltage, the output terminals of the DC stabilized power supply are respectively connected to the processing unit, the first conversion unit, the second conversion unit, and the address code control Unit's power terminal connection. 9. An LED lamp based on the DMX512 protocol, characterized in that the LED lamp comprises the LED automatic addressing circuit and LEDs based on the DMX512 protocol according to any one of claims 1 to 8. 10. An LED lighting control system based on the DMX512 protocol, characterized in that the LED lighting control system includes a host computer, a master controller connected to the host computer, and multiple sub-controllers connected to the master controller device and the LED lamp based on DMX512 protocol as claimed in claim 9.