CN111954340A - A DMX512 signal amplifier and LED control system - Google Patents

Abstract

The invention relates to the field of lamp control, in particular to a DMX512 signal amplifier and an LED control system. The DMX512 signal amplifier comprises a signal isolation module, a differential signal input processing module and an address signal input processing module which are connected with the input end of the signal isolation module and used as the input of a front stage, and a differential signal output processing module and an address signal output processing module which are connected with the output end of the signal isolation module and used as the output of a rear stage, wherein the differential signal input processing module shapes the input differential signal, converts the input differential signal into a corresponding TTL signal and transmits the TTL signal to the differential signal output processing module through the signal isolation module; the address signal input processing module carries out shaping processing on the input address signal and transmits the shaped address signal to the address signal output processing module through the signal isolation module. The invention can realize the signal isolation of the differential signal and the address signal input at the front stage and the signal output at the rear stage, and improve the safety and the stability of the LED control system.

Description

A DMX512 signal amplifier and LED control system

technical field

The invention relates to the field of lamp control, in particular to a DMX512 signal amplifier and an LED control system.

Background technique

In the outdoor LED control system, there is usually a distance of tens or hundreds of meters between the LED controller and the lamps, or between the lamps and the lamps. The long-distance transmission will cause signal distortion, and it may be struck by lightning, causing the entire LED Control system damaged.

In the existing LED control system, only anti-static and high-voltage pulse protection is added to the signal output port of the LED controller at the user end to achieve signal isolation, but signal isolation cannot be achieved between lamps and lamps. It is easy to cause other lamps to fail to work normally due to the damage of one lamp, and the safety and stability of the entire LED control system are poor.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a DMX512 signal amplifier and an LED control system in view of the above-mentioned defects of the prior art, so as to solve the problem that signal isolation cannot be achieved between lamps and lamps in the existing LED control system, and the safety and stability are poor. The problem.

The technical solution adopted by the present invention to solve the technical problem is to provide a DMX512 signal amplifier for signal isolation between an LED controller and lamps or between lamps and lamps, and the DMX512 signal amplifier includes a signal input A signal isolation module that is isolated from the output, a differential signal input processing module and an address signal input processing module connected to the input end of the signal isolation module and used as the input of the front stage, and a signal isolation module that is connected to the output end of the signal isolation module and used as the output of the latter stage A differential signal output processing module and an address signal output processing module, wherein,

The differential signal input processing module performs shaping processing on the input differential signal, converts the input differential signal into a corresponding TTL signal, and transmits it to the differential signal output processing module through the signal isolation module, and the differential signal output processing module will convert the The obtained TTL signal is converted into the corresponding differential signal and then output;

The address signal input processing module performs shaping processing on the input address signal, and transmits it to the address signal output processing module through the signal isolation module, and the address signal output processing module outputs the shaped address signal.

A further preferred solution of the present invention is: the DMX512 signal amplifier further includes a signal synchronization module for performing equal delay processing on the converted TTL signal and the shaped address signal, and the differential signal output processing module and address The signal output processing modules are all connected with the output end of the signal isolation module through the signal synchronization module.

A further preferred solution of the present invention is: the DMX512 signal amplifier further includes a power supply voltage regulator module and a power supply isolation module for supplying voltage, and the differential signal input processing module and the address signal input processing module are both connected to the power supply voltage regulator module. The differential signal output processing module and the address signal output processing module are both connected to the power supply voltage regulator module through the power isolation module, so as to isolate the power supply of the front-stage input and the rear-stage output.

A further preferred solution of the present invention is that: the signal isolation module includes an optocoupler unit, and the optocoupler unit couples the input TTL signal and the address signal to the output terminal, and transmits the corresponding signal to the differential signal output processing module and the address signal output module.

A further preferred solution of the present invention is that: the differential signal input processing module includes a differential signal comparator unit whose output terminal is connected to the input terminal of the signal isolation module, and the differential signal comparator unit converts the input differential signal into The corresponding TTL signal is transmitted to the signal isolation module.

A further preferred solution of the present invention is: the differential signal input processing module further includes a resettable fuse F1, a bidirectional transient suppression diode D1, a resettable fuse F2, a unidirectional transient suppression diode D2, a unidirectional transient suppression diode D2, state suppression diode D3, pull-up resistor R1, and pull-down resistor R2, the positive electrode of the unidirectional TVS diode D2 is grounded, and the negative electrode is connected to the connection node between the resettable fuse F1 and the bidirectional TVS diode D1, the unidirectional TVS suppression diode D1 The positive electrode of the TVS diode D3 is grounded, and the negative electrode is connected to the connection node of the bidirectional TVS diode D1 and the resettable fuse F2. One end of the pull-up resistor R1 is connected to an input end of the differential signal comparator unit, and the other end is connected to Power supply, one end of the pull-down resistor R2 is connected to the other input end of the differential signal comparator unit, and the other end is grounded.

A further preferred solution of the present invention is that: the differential signal output processing module includes a TTL logic level processor unit whose input end is connected to the output end of the signal isolation module, and the TTL logic level processor unit converts the input The TTL signal is converted into a corresponding differential signal, and the differential signal is output.

A further preferred solution of the present invention is: the differential signal output processing module further includes a resettable fuse F3, a bidirectional transient suppression diode D4, a resettable fuse F4, a unidirectional transient suppression diode D5, a unidirectional transient suppression diode D5, state suppression diode D6, pull-up resistor R3, and pull-down resistor R4, the positive electrode of the one-way TVS diode D5 is grounded, and the negative electrode is connected to the connection node of the resettable fuse F3 and the two-way TVS diode D4, the one-way TVS diode D4 The positive electrode of the TVS diode D6 is grounded, and the negative electrode is connected to the connection node of the bidirectional TVS diode D4 and the resettable fuse F4. One end of the pull-up resistor R3 is connected to an output end of the TTL logic level processor unit, and the other end is connected to the TTL logic level processor unit. One end is connected to the power supply, one end of the pull-down resistor R4 is connected to the other output end of the TTL logic level processor unit, and the other end is grounded.

A further preferred solution of the present invention is that: the address signal input processing module includes a Schmitt trigger unit for performing shaping processing on the address signal input from the previous stage.

The technical solution adopted by the present invention to solve the technical problem is to provide an LED control system, which includes an LED controller and at least one lamp, and also includes the DMX512 signal amplifier as described in any of the above, wherein the DMX512 signal amplifier is arranged on the LED Between the controller and the luminaire, or between a luminaire and another luminaire.

The beneficial effect of the present invention is that, compared with the prior art, by providing a differential signal input processing module, an address signal input processing module, a differential signal output processing module, an address signal output processing module and a signal isolation module, the differential signal input processing module and The address signal input processing module performs shaping processing on the received differential signal and address signal, and the shaped signal is transmitted to the differential signal output processing module and the address signal output processing module at the subsequent stage through the signal isolation module to realize differential signal and address The signal is isolated from the input of the front stage and the output of the rear stage, so as to realize the signal isolation between the LED controller and the lamps, and between the lamps and the lamps in the applied LED control system, realize the multi-point protection on the single bus, and improve the LED control. System security and stability.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

Fig. 1 is the structural block diagram of the LED control system of the present invention (DMX512 signal amplifier is applied between the LED controller and the lamp);

Fig. 2 is the structural block diagram of the LED control system of the present invention (DMX512 signal amplifier is applied between lamps and lamps);

Fig. 3 is the structural block diagram of DMX512 signal amplifier of the present invention;

4 is a schematic circuit diagram of a power isolation module of the present invention;

5 is a schematic circuit diagram of a differential signal input processing module of the present invention;

6 is a differential signal conversion characteristic diagram of the differential signal input processing module of the present invention;

7 is a schematic circuit diagram of a differential signal output processing module of the present invention;

8 is a waveform diagram of an address signal;

Fig. 9 is the voltage transmission characteristic diagram of the address signal input processing module of the present invention;

10 is a schematic circuit diagram of an address signal input processing module of the present invention;

11 is a schematic circuit diagram of an address signal output processing module of the present invention.

Detailed ways

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

The DMX512 signal amplifier 200 of the present invention is applied in an LED control system, and the LED control system further includes an LED controller 100 and at least one lamp 300. The DMX512 signal amplifier 200 is arranged between the LED controller 100 and the lamp 300, as shown in FIG. 1 . , used for signal isolation between the LED controller 100 and the lamp 300; or between the lamp 300 and the lamp 300, as shown in Figure 2, used for signal isolation between the lamp 300 and the lamp 300, improving the LED control system security and stability.

As shown in FIG. 3 , the present invention provides a preferred embodiment of a DMX512 signal amplifier 200 .

Referring to FIG. 3 , the DMX512 signal amplifier 200 includes a signal isolation module 50 for isolating the input and output of the signal, and is connected to the input end of the signal isolation module 50 and is used as the differential signal input processing module 10 and address of the front stage input. The signal input processing module 20, as well as the differential signal output processing module 30 and the address signal output processing module 40 which are connected to the output end of the signal isolation module 50 and output as the latter stage, wherein the differential signal input processing module 10 has a differential signal input to the input The signal is shaped, and the input differential signal is converted into a corresponding TTL signal, and transmitted to the differential signal output processing module 30 through the signal isolation module 50, and the differential signal output processing module 30 converts the converted TTL signal into the corresponding TTL signal. The differential signal is output; the address signal input processing module 20 performs shaping processing on the input address signal, and transmits it to the address signal output processing module 40 through the signal isolation module 50, and the address signal output processing module 40 shapes the processed address signal. The address signal is output.

By setting the differential signal input processing module 10 in the front stage input to perform shaping processing on the input differential signal, and converting the differential signal into a corresponding TTL signal, the address signal input processing module 20 performs shaping processing on the input address signal, and in the subsequent stage Output setting: The address signal output processing module 40 and the differential signal output processing module 30 respectively shape and output the differential signal and the address signal, and a signal isolation module 50 is set between the input of the previous stage and the output of the rear stage to realize the input of the previous stage and the output of the rear stage. Signal isolation of level output, thus realizing the signal isolation between the LED controller 100 and the lamps 300 and between the lamps 300 and 300 in the applied LED control system, realizing multi-point protection on a single bus, and improving the reliability of the LED control system. Security and stability.

Among them, in the LED control system, there is usually a distance of tens or hundreds of meters between the LED controller 100 and the lamp 300, or between the lamp 300 and the lamp 300, and the signal is transmitted over a long distance or in a strong magnetic field environment. It is easy to cause digital signal distortion. The differential signal input processing module 10 is set in the front-end input to perform shaping processing on the differential signal, and the address signal input processing module 20 performs shaping processing on the address signal, so that the output signal can be processed by the LED control chip in the LED control system. The decoding can avoid the influence of signal distortion on the LED control system, and further improve the safety and stability of the LED control system. When the DMX512 signal amplifier 200 is arranged between the LED controller 100 and the lamp 300, the LED controller 100 is connected to the differential signal input processing module 10 and the address signal input processing module 20 of the DMX512 signal amplifier 200 to transmit the differential signal to the differential signal input The processing module 10 transmits the address signal to the address signal input processing module 20. The differential signal output processing module 30 and the address signal output processing module 40 of the DMX512 signal amplifier 200 are connected to the lamps, output differential signals and address signals to the lamps, and perform processing on the lamps. Control; when the DMX512 signal amplifier 200 is set between the lamps 300 and the lamps 300, a lamp 300 is connected to the differential signal input processing module 10 and the address signal input processing module 20 of the DMX512 signal amplifier 200, and the differential signal is transmitted to the differential signal input processing module The module 10 transmits the address signal to the address signal input processing module 20, the other lamp 300 and the differential signal output processing module 30 of the DMX512 signal amplifier 200 and the address signal output processing module 40 receive the differential signal and transmit it to the differential signal.

In this embodiment, in order to reduce the misjudgment of the lamp 300 when writing addresses and parameters, and improve the success rate of writing addresses, the DMX512 signal amplifier 200 further includes a signal for performing processing on the converted TTL signal and the reshaped address signal. The signal synchronization module 60 for equal delay processing, the differential signal output processing module 30 and the address signal output processing module 40 are both connected to the output end of the signal isolation module 50 through the signal synchronization module. Specifically, the signal synchronization module 60 can use a multi-level signal buffer to perform equal delay processing on the TTL signal and the address signal output by the signal isolation module 50 to solve the problem of transmission delay between the input differential signal and the address signal.

Further, the DMX512 signal amplifier 200 further includes a power supply voltage regulator module 70 for providing voltage, and the power supply voltage regulator module 70 is respectively connected with the differential signal input processing module 10, the address signal input processing module 20, and the differential signal output processing module. 30 is connected to the address signal output processing module 40 . The power supply voltage regulator module 70 can use a step-down topology circuit to adapt to a wider external output voltage. In the scenario where the output voltage of the external power supply is too high, the power supply voltage regulator module 70 starts the step-down working mode, and the external power supply In the case of undervoltage of the output voltage, the power supply voltage regulator module 70 starts the boosting working mode and outputs a stable 5V voltage, which is the differential signal input processing module 10, the address signal input processing module 20, the differential signal output processing module 30 and the address signal output. The processing module 40 provides a stable working voltage.

Further, the DMX512 signal amplifier 200 further includes a power isolation module 80 , and the differential signal output processing module 30 and the address signal output processing module 40 are both connected to the power supply voltage stabilization module 70 through the power isolation module 80 . The power isolation module 80 isolates the output voltage of the power voltage regulator module 70 to supply power to the differential signal output processing module 30 , the address signal output processing module 40 and the signal synchronization module 60 of the subsequent stage, so as to realize the input circuit of the previous stage and the output circuit of the subsequent stage. isolation between the power supplies. Using the combination of power isolation and signal coupling isolation, there is no electrical connection between the input signal and the output signal, so that the processing of the input signal of the previous stage and the processing of the output signal of the latter stage work independently without affecting each other. Therefore, the output signal of the latter stage is The high-voltage pulse on the device will not cause interference and damage to the front-end signal source, improving the safety and stability of the overall system. In addition, the signal synchronization module 60 is also connected to the power supply voltage regulation module 70 through the power isolation module 80 to obtain the working voltage.

Specifically, referring to FIG. 4 , the power isolation module 80 includes a voltage regulator chip B0505S U1, a resistor R5 and a capacitor C1, and the resistor R5 and the capacitor C1 are arranged in parallel between pins 3 and 4 of the voltage regulator chip B0505S U1. The resistor R5 is used as a power matching resistor, so that the power isolation module 80 can work in a high-efficiency output mode, and the capacitor C1 can play a filtering role.

In this embodiment, the signal isolation module 50 includes an opto-coupler unit, and the opto-coupler unit couples the input TTL signal and the address signal to the output end, and transmits it to the differential signal output processing module 30 and the address signal output processing correspondingly 40 modules. The optocoupler unit is used to apply coupling technology combined with the aforementioned power isolation to achieve signal isolation and power isolation between the input of the front stage and the output of the rear stage.

Referring to FIG. 5 , the differential signal input processing module 10 in this embodiment includes a differential signal comparator unit whose output terminal is connected to the input terminal of the signal isolation module 50 , and the differential signal comparator unit compares the differential signal input from the previous stage. It is converted into a corresponding TTL signal and transmitted to the signal isolation module 50 .

Further, the differential signal input processing module 10 also includes a resettable fuse F1, a bidirectional transient suppression diode D1, and a resettable fuse F2 connected in series, as well as a unidirectional transient suppression diode D2, a unidirectional transient suppression diode D3, Pull-up resistor R1 and pull-down resistor R2, the anode of the unidirectional TVS diode D2 is grounded, and the negative electrode is connected to the connection node between the resettable fuse F1 and the bidirectional TVS diode D1, the unidirectional TVS diode D3 The positive pole is grounded, and the negative pole is connected to the connection node of the bidirectional transient suppression diode D1 and the resettable fuse F2. One end of the pull-up resistor R1 is connected to an input end of the differential signal comparator unit, and the other end is connected to the power supply. One end of the resistor R2 is connected to the other input end of the differential signal comparator unit, and the other end is grounded. The power supply can be provided by a power supply voltage regulator module.

Wherein, the differential signal comparator unit adopts the differential signal comparator in the first chip SM485 U2. Specifically, one end of the pull-up resistor R1 and the connection node of the resettable fuse F1 and the one-way TVS diode D2 are connected to the pin 6 of the first chip SM485 U2, and one end of the pull-down resistor R2 and the two-way TVS diode D1 are connected to The connection node of the resettable fuse F2 is connected to the pin 7 of the first chip SM485 U2, the A+ signal of the differential signal input by the previous stage is input to the pin 6 of the first chip SM485 U2 through the resettable fuse F1, and the B- signal is processed by the self-recovery fuse F1. The recovery fuse F2 is input to pin 7 of the first chip SM485U2, and the differential signal is converted into the corresponding TTL signal by the differential signal comparator inside the first chip SM485 U2, and is output to the signal isolation by the pin 1 of the first chip SM485 U2 module 50. Under continuous high-voltage pulses, the resettable fuse F1 and resettable fuse F2 are disconnected, preventing the latter-stage bidirectional TVS diode D1, unidirectional TVS diode D2 and unidirectional TVS diode D3 from absorbing excessive high-voltage pulses Energy and heat damage; after the signal is stable, the self-recovery fuse F1 and the self-recovery fuse F2 have low impedance, which has no effect on the input signal. The setting of the one-way TVS diode D2 and the one-way TVS diode D3 can prevent the first chip SM485 U2 from being instantly impacted by high-voltage high-frequency electromagnetic pulses, and protect the first chip SM485 U2. In this embodiment, the differential signal input processing module 10 further includes a resistor R6, one end of the resistor R6 is connected to the pin 7 of the first chip SM485 U2, and the other end is connected to the power supply. The power supply can be provided by a power supply voltage regulator module.

In this embodiment, the input and output voltage characteristics of the differential signal voltage can be seen in FIG. 6 , wherein the voltage of the differential signal _A + signal is defined as VA , the voltage of the differential signal B- signal is defined as _VB , and VA - _VB ≥ _200mV When the output voltage V _OUT = VCC is logic 1, when V _B -V _A ≥ 200mV, the output voltage V _OUT = 0 is logic 0. This input feature is compatible with RS485 level, and has strong anti-common mode interference ability. It is used in the field of RS485 simplex communication.

In this embodiment, the differential signal output processing module 30 includes a TTL logic level processor unit whose input end is connected to the output end of the signal isolation module 50 , and the TTL logic level processor unit converts the input TTL signal into corresponding differential signal, and output the differential signal.

Further, referring to FIG. 7 , the differential signal output processing module 30 further includes a resettable fuse F3, a bidirectional transient suppression diode D4, a resettable fuse F4, and a unidirectional transient suppression diode D5, a unidirectional transient suppression diode D5, and a unidirectional transient suppression diode D5. Suppression diode D6, pull-up resistor R3, and pull-down resistor R4, the anode of the unidirectional transient suppression diode D5 is grounded, and the cathode is connected to the connection node of the resettable fuse F3 and the bidirectional transient suppression diode D4, the unidirectional transient suppression diode D4. The anode of the state suppression diode D6 is grounded, and the cathode is connected to the connection node of the bidirectional transient suppression diode D4 and the resettable fuse F4. One end of the pull-up resistor R3 is connected to an output end of the TTL logic level processor unit, and the other end is connected to the output end of the TTL logic level processor unit. Connect the power supply, one end of the pull-down resistor R4 is connected to the other output end of the TTL logic level processor unit, and the other end is grounded. The power supply can be provided by a power supply voltage regulator module.

The TTL logic level processor unit adopts the TTL logic level processor in the second chip SM485 U3, and the TTL logic level processor converts the TTL signal output by the signal isolation module 50 into a corresponding differential signal. Specifically, one end of the pull-up resistor R3 and the connection node of the resettable fuse F4 and the one-way transient suppression diode D6 are connected to the pin 6 of the second chip SM485 U3, the pull-down resistor R4 and the resettable fuse F3 are connected to the one-way transient The connection node of suppressor diode D4 is connected to pin 7 of the second chip SM485 U3. Under continuous high voltage pulses, the resettable fuse F3 and resettable fuse F4 are disconnected, preventing the bidirectional TVS diode D4, the unidirectional TVS diode D5 and the unidirectional TVS diode D6 from absorbing excessive high voltage pulse energy. Heat damage; after the signal is stable, the self-recovery fuse F3 and the self-recovery fuse F4 have low impedance, which has no effect on the output signal. The setting of the one-way TVS diode D5 and the one-way TVS diode D6 can prevent the second chip SM485 U3 from being instantly impacted by high-voltage high-frequency electromagnetic pulses, and protect the second chip SM485 U3. The TTL signal output by the signal isolation module 50 is output to pin 4 of the second chip SM485 U3, and is converted into a corresponding differential signal by the TTL logic level processor inside the second chip SM485 U3, and the A+ signal is supported by the self-recovery fuse F4. Road output, B- signal is output through the branch of self-recovery fuse F3.

In this embodiment, the address signal input processing module 20 includes a Schmitt trigger unit for performing shaping processing on the address signal input from the previous stage. The Schmitt trigger unit has two stable states. It adopts the potential trigger method, and its state is maintained by the input signal. For the input signal with two different changing directions of negative decreasing and positive increasing, the Schmitt trigger unit has different thresholds. The voltage uses a Schmitt trigger as the input stage of the address signal, which can shape the uneven digital signal. Among them, the input voltage transfer characteristics of the Schmitt trigger unit can refer to Figure 8 and Figure 9, the address input signal voltage rises from U _- through 0 point to U ₊ , the corresponding output voltage is U _0H , the address signal from U ₊ through VCC down to U _- , the corresponding output voltage is U _0L . In the voltage transfer characteristic, the hysteresis voltage ΔV _T =V _T+ -V _T- =V _CC /3.

Specifically, referring to FIG. 10 , the Schmitt trigger unit adopts chip 74LVC1G17 U4, and the address signal input processing module 20 further includes a resettable fuse F5, a unidirectional transient suppression diode D7, a resistor R6 and a capacitor C2. One end of the recovery fuse F5 is connected to pin 2 of the chip 74LVC1G17 U4, the resistor R6 and the one-way transient suppression diode D7 are connected in series between the power supply voltage regulator module 70 and the ground terminal and in parallel with the capacitor C2, and the resistor R6 is connected to the one-way transistor. The connection node of the TVS diode D7 is connected to the pin 2 of the chip 74LVC1G17 U4, the pin 5 of the chip 74LVC1G17 U4 is connected to the power voltage regulator module 70, and the pin 3 is connected to the ground terminal. The address signal input from the previous stage is input to the chip 74LVC1G17 U4 through the self-recovery fuse F5 for shaping, and then the shaped address signal is output from pin 4 to the signal isolation module 50 . The one-way transient suppression diode D7 prevents the chip 74LVC1G17 U4 from being instantly impacted by high energy, and protects the chip 74LVC1G17 U4. Under continuous high-voltage pulses, the resettable fuse F5 is disconnected to prevent the post-stage one-way transient suppression diode D7 from being heated and damaged due to absorbing too much high-voltage pulse energy. After the signal is stable, the resettable fuse F5 has a low impedance, which has a low impedance to the input signal. no effect.

Referring to FIG. 11 , the address signal output processing module 40 in this embodiment includes a push-pull output circuit unit for push-pull output of the shaped address signal. The push-pull output circuit unit can improve the output carrying capacity of the address line. Specifically, the push-pull output circuit unit adopts the chip 74LVC2G17 U5, the pin 3 of the chip 74LVC2G17 U5 inputs the address signal output by the signal isolation module 50, and the address signal output processing module 40 also includes a self-recovery fuse F6, a one-way transient suppression Diode D8 and capacitor C3, one end of resettable fuse F6 is connected to pin 4 of chip 74LVC2G17 U5, the positive electrode of unidirectional TVS diode D8 is grounded, and the negative electrode is connected to pin 4 of chip 74LVC2G17 U5. The address signal output by the signal isolation module 50 is input to pin 4 of the chip 74LVC2G17 U5, and is output by the push-pull output of the chip 74LVC2G17 U5 through the resettable fuse F6. The one-way transient suppression diode D8 prevents the chip 74LVC2G17 U5 from being instantly impacted by high energy, and protects the chip 74LVC2G17 U5. Under continuous high-voltage pulses, the resettable fuse F6 is broken to prevent the one-way transient suppression diode D8 from being damaged due to absorbing excessive high-voltage pulse energy. After the signal is stable, the resettable fuse F5 has a low impedance and has no effect on the output signal. .

The DMX512 signal amplifier 200 of the present invention can be applied in the LED control system to isolate the signal of the lamps 300 of the user-end LED controller 100 to realize multi-point protection on a single bus, and the DMX512 signal amplifier 200 is compatible with unipolar A+ signal input , suitable for single-line DMX512 lamps 300, also compatible with RS485 communication, and can also be used in the field of RS485 simplex communication.

It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them. For those skilled in the art, the technical solutions recorded in the above embodiments can be modified, or some of the technical features can be modified. Equivalent replacements are made; and all such modifications and replacements should fall within the protection scope of the appended claims of the present invention.

Claims (10)

1. A DMX512 signal amplifier is used for signal isolation between an LED controller and a lamp or between the lamp and the lamp, and is characterized in that the DMX512 signal amplifier comprises a signal isolation module for isolating input and output of signals, a differential signal input processing module and an address signal input processing module which are connected with the input end of the signal isolation module and are used as the input of a front stage, and a differential signal output processing module and an address signal output processing module which are connected with the output end of the signal isolation module and are used as the output of a rear stage, wherein,

the differential signal input processing module is used for shaping the input differential signal, converting the input differential signal into a corresponding TTL signal and transmitting the TTL signal to the differential signal output processing module through the signal isolation module, and the differential signal output processing module is used for converting the TTL signal obtained by conversion into a corresponding differential signal and outputting the differential signal;

the address signal input processing module shapes the input address signal and transmits the shaped address signal to the address signal output processing module through the signal isolation module, and the address signal output processing module outputs the shaped address signal.

2. The DMX512 signal amplifier of claim 1, wherein the DMX512 signal amplifier further comprises a signal synchronization module for performing equal delay processing on the converted TTL signal and the shaped address signal, and the differential signal output processing module and the address signal output processing module are both connected to the output end of the signal isolation module through the signal synchronization module.

3. The DMX512 signal amplifier of claim 1 further comprising a power supply voltage stabilization module and a power supply isolation module for providing voltage, wherein the differential signal input processing module and the address signal input processing module are both connected to the power supply voltage stabilization module, and the differential signal output processing module and the address signal output processing module are both connected to the power supply voltage stabilization module through the power supply isolation module for power supply isolation of the front-stage input and the rear-stage output.

4. The DMX512 signal amplifier according to any of claims 1-3, wherein the signal isolation module comprises an opto-coupler unit, the opto-coupler unit couples the input TTL signal and the address signal to the output terminal for transmission to the differential signal output processing module and the address signal output processing module, respectively.

5. The DMX512 signal amplifier of claim 1 wherein the differential signal input processing module includes a differential signal comparator unit having an output connected to the input of the signal isolation module, the differential signal comparator unit converting the input differential signal into a corresponding TTL signal and transmitting the TTL signal to the signal isolation module.

6. The DMX512 signal amplifier of claim 5, wherein the differential signal input processing module further comprises a self-recovery fuse F1, a bidirectional transient suppression diode D1 and a self-recovery fuse F2 connected in series in this order, and a unidirectional transient suppression diode D2, a unidirectional transient suppression diode D3, a pull-up resistor R1, and a pull-down resistor R2, the unidirectional transient suppression diode D2 has an anode connected to ground, a cathode connected to a connection node of the self-recovery fuse F1 and the bidirectional transient suppression diode D1, the unidirectional transient suppression diode D3 has an anode connected to ground, a cathode connected to a connection node of the bidirectional transient suppression diode D1 and the self-recovery fuse F2, the pull-up resistor R1 has one end connected to an input terminal of the differential signal comparator unit and the other end connected to a power supply, the pull-down resistor R2 has one end connected to another input terminal of the differential signal comparator unit, the other end is grounded.

7. The DMX512 signal amplifier of claim 1 wherein the differential signal output processing module includes a TTL logic level processor unit having an input terminal connected to the output terminal of the signal isolation module, the TTL logic level processor unit converting the input TTL signal to a corresponding differential signal and outputting the differential signal.

8. The DMX512 signal amplifier of claim 7, wherein the differential signal output processing module further comprises a self-recovery fuse F3, a bidirectional transient suppression diode D4 and a self-recovery fuse F4 connected in series in this order, and a unidirectional transient suppression diode D5, a unidirectional transient suppression diode D6, a pull-up resistor R3, and a pull-down resistor R4, the unidirectional transient suppression diode D5 has an anode connected to ground, a cathode connected to a connection node of the self-recovery fuse F3 and the bidirectional transient suppression diode D4, the unidirectional transient suppression diode D6 has an anode connected to ground, a cathode connected to a connection node of the bidirectional transient suppression diode D4 and the self-recovery fuse F4, the pull-up resistor R3 has one end connected to an output terminal of the TTL logic level processor unit and the other end connected to a power supply, the pull-down resistor R4 has one end connected to another output terminal of the TTL logic level processor unit, the other end is grounded.

9. The DMX512 signal amplifier of claim 1, wherein the address signal input processing module comprises a schmitt trigger unit for shaping an address signal input from a previous stage.

10. An LED control system comprising an LED controller and at least one light fixture, wherein the LED control system further comprises the DMX512 signal amplifier of any of claims 1-9, wherein the DMX512 signal amplifier is disposed between the LED controller and the light fixture, or between one light fixture and another light fixture.

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