CN111954340A - DMX512 signal amplifier and LED control system - Google Patents
DMX512 signal amplifier and LED control system Download PDFInfo
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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
Technical Field
The invention relates to the field of lamp control, in particular to a DMX512 signal amplifier and an LED control system.
Background
In an outdoor LED control system, a distance of tens or hundreds of meters is usually formed between an LED controller and a lamp or between the lamp and the lamp, signal distortion is caused by long-distance transmission, and the whole LED control system is damaged due to lightning stroke.
In the existing LED control system, antistatic and high-voltage pulse protection is added only at a signal output port of an LED controller at a user side to realize signal isolation, but signal isolation cannot be realized between lamps, other lamps cannot normally work easily due to damage of a certain lamp among a plurality of mutually connected lamps, and the whole LED control system is poor in safety and stability.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a DMX512 signal amplifier and an LED control system, aiming at the above-mentioned defects in the prior art, and solve the problems that signal isolation cannot be realized between lamps and the existing LED control system, and the safety and stability are poor.
The technical scheme adopted by the invention for solving the technical problems is as follows: there is provided a DMX512 signal amplifier for signal isolation between an LED controller and a lamp or between a lamp and a lamp, the DMX512 signal amplifier including a signal isolation module for isolating input and output of a signal, a differential signal input processing module and an address signal input processing module connected to an input terminal of the signal isolation module and serving as a previous stage input, and a differential signal output processing module and an address signal output processing module connected to an output terminal of the signal isolation module and serving as a subsequent stage output, 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.
Further preferred embodiments of the present invention are: the DMX512 signal amplifier also comprises a signal synchronization module used for performing equal delay processing on the converted TTL signal and the address signal after the shaping processing, and the differential signal output processing module and the address signal output processing module are both connected with the output end of the signal isolation module through the signal synchronization module.
Further preferred embodiments of the present invention are: the DMX512 signal amplifier also comprises a power supply voltage stabilizing module and a power supply isolating module, wherein the power supply voltage stabilizing module is used for providing voltage, the differential signal input processing module and the address signal input processing module are both connected with the power supply voltage stabilizing module, and the differential signal output processing module and the address signal output processing module are both connected with the power supply voltage stabilizing module through the power supply isolating module so as to isolate the power supply with the input at the front stage and the output at the rear stage.
Further preferred embodiments of the present invention are: the signal isolation module comprises a photoelectric coupler unit, wherein the photoelectric coupler unit couples the input TTL signal and the address signal to the output end and correspondingly transmits the TTL signal and the address signal to the differential signal output processing module and the address signal output module.
Further preferred embodiments of the present invention are: the differential signal input processing module comprises a differential signal comparator unit, the output end of the differential signal comparator unit is connected with the input end of the signal isolation module, and the differential signal comparator unit converts the input differential signal into a corresponding TTL signal and transmits the TTL signal to the signal isolation module.
Further preferred embodiments of the present invention are: the differential signal input processing module further comprises a self-recovery fuse F1, a bidirectional transient suppression diode D1, a self-recovery fuse F2, a unidirectional transient suppression diode D2, a unidirectional transient suppression diode D3, a pull-up resistor R1 and a pull-down resistor R2 which are sequentially connected in series, wherein the anode of the unidirectional transient suppression diode D2 is grounded, the cathode of the unidirectional transient suppression diode D2 is connected to the connection node of the self-recovery fuse F1 and the bidirectional transient suppression diode D1, the anode of the unidirectional transient suppression diode D3 is grounded, the cathode of the unidirectional transient suppression diode D3 is connected to the connection node of the bidirectional transient suppression diode D1 and the self-recovery fuse F2, one end of the pull-up resistor R1 is connected with one input end of the differential signal comparator unit, the other end of the pull-up resistor R1 is connected with the power supply, one end of the pull-down resistor R2.
Further preferred embodiments of the present invention are: the differential signal output processing module comprises a TTL logic level processor unit of which the input end is connected with the output end of the signal isolation module, and the TTL logic level processor unit converts the input TTL signals into corresponding differential signals and outputs the differential signals.
Further preferred embodiments of the present invention are: the differential signal output processing module further comprises a self-recovery fuse F3, a bidirectional transient suppression diode D4, a self-recovery fuse F4, a unidirectional transient suppression diode D5, a unidirectional transient suppression diode D6, a pull-up resistor R3 and a pull-down resistor R4 which are sequentially connected in series, wherein the anode of the unidirectional transient suppression diode D5 is grounded, the cathode of the unidirectional transient suppression diode D5 is connected to the connection node of the self-recovery fuse F3 and the bidirectional transient suppression diode D4, the anode of the unidirectional transient suppression diode D6 is grounded, the cathode of the unidirectional transient suppression diode D6 is connected to the connection node of the bidirectional transient suppression diode D4 and the self-recovery fuse F4, one end of the pull-up resistor R3 is connected with one output end of the TTL logic level processor unit, the other end of the pull-up resistor R3 is connected with the power supply, one end of the pull-down resistor R4 is.
Further preferred embodiments of the present invention are: the address signal input processing module comprises a Schmitt trigger unit used for shaping the address signal input by the previous stage.
The technical scheme adopted by the invention for solving the technical problems is as follows: an LED control system is provided, which includes an LED controller and at least one lamp, and further includes any one of the above DMX512 signal amplifiers, where the DMX512 signal amplifier is disposed between the LED controller and the lamp, or between one lamp and another lamp.
Compared with the prior art, the invention has the advantages that the differential signal input processing module, the address signal input processing module, the differential signal output processing module, the address signal output processing module and the signal isolation module are arranged, the differential signal input processing module and the address signal input processing module carry out shaping processing on the differential signals and the address signals which are correspondingly received, the signals which are subjected to shaping processing are transmitted to the differential signal output processing module and the address signal output processing module at the rear stage through the signal isolation module, the isolation of the differential signals and the address signals which are input at the front stage and output at the rear stage is realized, the signal isolation between an LED controller and a lamp and between the lamp and the lamp in the applied LED control system is realized, the multi-point protection on a single bus is realized, and the safety and the stability of the LED control system are improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of the LED control system (DMX512 signal amplifier is used between LED controller and lamp) of the present invention;
FIG. 2 is a block diagram of the LED control system (DMX512 signal amplifier is used between lamps) according to the present invention;
FIG. 3 is a block diagram of the DMX512 signal amplifier of the present invention;
FIG. 4 is a schematic circuit diagram of the power isolation module of the present invention;
FIG. 5 is a circuit schematic of the differential signal input processing module of the present invention;
FIG. 6 is a graph of the differential signal conversion characteristics of the differential signal input processing module of the present invention;
FIG. 7 is a circuit schematic of the differential signal output processing module of the present invention;
FIG. 8 is a waveform diagram of an address signal;
FIG. 9 is a voltage transfer characteristic diagram of an address signal input processing module according to the present invention;
FIG. 10 is a circuit schematic of an address signal input processing module of the present invention;
fig. 11 is a circuit diagram of the address signal output processing module of the present invention.
Detailed Description
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 to an LED control system, the LED control system further includes an LED controller 100 and at least one lamp 300, the DMX512 signal amplifier 200 is disposed between the LED controller 100 and the lamp 300, as shown in fig. 1, and is 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 fig. 2, for signal isolation between the lamp 300 and the lamp 300, so as to improve the safety and stability of the LED control system.
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 input and output of signals, a differential signal input processing module 10 and an address signal input processing module 20 connected to an input end of the signal isolation module 50 and used as a front-stage input, and a differential signal output processing module 30 and an address signal output processing module 40 connected to an output end of the signal isolation module 50 and used as a rear-stage output, wherein the differential signal input processing module 10 shapes input differential signals, converts the input differential signals into corresponding TTL signals, and transmits the TTL signals to the differential signal output processing module 30 through the signal isolation module 50, and the differential signal output processing module 30 converts the TTL signals obtained by conversion into corresponding differential signals and outputs the TTL signals; the address signal input processing module 20 shapes the input address signal and transmits the shaped address signal to the address signal output processing module 40 through the signal isolation module 50, and the address signal output processing module 40 outputs the shaped address signal.
The input differential signal input processing module 10 is arranged at the front-stage input for shaping the input differential signal, the differential signal is converted into a corresponding TTL signal, the address signal input processing module 20 is used for shaping the input address signal, the address signal output processing module 40 and the differential signal output processing module 30 are arranged at the rear-stage output for shaping and outputting the differential signal and the address signal respectively, the signal isolation module 50 is arranged between the front-stage input and the rear-stage output for isolating the signals of the front-stage input and the rear-stage output, so that the signal isolation between the LED controller 100 and the lamp 300 and between the lamp 300 and the lamp 300 in the applied LED control system is realized, the multi-point protection on a single bus is realized, and the safety and the stability of the LED control system are improved.
In the LED control system, a distance of tens or hundreds of meters is usually provided between the LED controller 100 and the lamp 300, or between the lamp 300 and the lamp 300, and signals are easily distorted in a long-distance transmission or in a strong magnetic field environment, the differential signal input processing module 10 is arranged at the front-stage input to shape the differential signals, and the address signal input processing module 20 shapes the address signals, so that the output signals can be decoded by an LED control chip in the LED control system, thereby avoiding the influence of signal distortion on the LED control system, and further improving 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, transmits the differential signal to the differential signal input processing module 10, transmits the address signal to the address signal input processing module 20, and 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 lamp, and outputs the differential signal and the address signal to the lamp to control the lamp; when the DMX512 signal amplifier 200 is disposed between the lamp 300 and the lamp 300, the differential signal input processing module 10 and the address signal input processing module 20 of one lamp 300 and the DMX512 signal amplifier 200 are connected to transmit the differential signal to the differential signal input processing module 10 and transmit the address signal to the address signal input processing module 20, and the differential signal output processing module 30 and the address signal output processing module 40 of the other lamp 300 and the DMX512 signal amplifier 200 receive the differential signal and transmit the differential signal to the differential signal.
In this embodiment, in order to reduce the misjudgment of the lamp 300 in writing addresses and parameters and improve the success rate of writing addresses, the DMX512 signal amplifier 200 further includes a signal synchronization module 60 for performing equal delay processing on the converted TTL signal and the shaped address signal, and 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 may employ a multi-stage signal buffer to perform equal-delay processing on the TTL signal and the address signal output by the signal isolation module 50, so as 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 stabilizing module 70 for providing voltage, and the power supply voltage stabilizing module 70 is respectively connected to 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 processing module 40. The power supply voltage stabilizing module 70 may adopt a circuit with a voltage-reducing topology structure, and is adapted to a relatively wide external output voltage, in a scene where the external power supply output voltage is too high, the power supply voltage stabilizing module 70 starts a voltage-reducing working mode, and in a scene where the external power supply output voltage is under-voltage, the power supply voltage stabilizing module 70 starts a voltage-increasing working mode to output a stable 5V voltage, so as to provide a stable working voltage for 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 processing module 40.
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 voltage stabilizing module 70 through the power isolation module 80. The power isolation module 80 isolates the output voltage of the power voltage stabilization 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 at the subsequent stage, so as to achieve power supply isolation between the input circuit at the previous stage and the output circuit at the subsequent stage. The mode of combining power isolation and signal coupling isolation is adopted, no electrical connection exists between input signals and output signals, and the processing of the input signals of the front stage and the processing of the output signals of the rear stage work independently and do not affect each other, so that high-voltage pulses on the output signals of the rear stage cannot cause interference and damage to a signal source of the front stage, and the safety and the stability of the whole system are improved. In addition, the signal synchronization module 60 is also connected to the power voltage stabilization 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 regulation chip B0505S U1, a resistor R5 and a capacitor C1, and the resistor R5 and the capacitor C1 are disposed in parallel between the pin 3 and the pin 4 of the voltage regulation 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 role in filtering.
In this embodiment, the signal isolation module 50 includes a photoelectric coupler unit, and the photoelectric coupler unit couples the input TTL signal and the address signal to the output terminal, and correspondingly transmits the TTL signal and the address signal to the differential signal output processing module 30 and the address signal output processing module 40. And the photoelectric coupler unit is used for realizing signal isolation and power isolation of the front-stage input and the rear-stage output by combining the coupling technology with the power isolation.
Referring to fig. 5, the differential signal input processing module 10 in this embodiment includes a differential signal comparator unit having an output terminal connected to the input terminal of the signal isolation module 50, where the differential signal comparator unit converts a differential signal input at a previous stage into a corresponding TTL signal and transmits the TTL signal to the signal isolation module 50.
Further, the differential signal input processing module 10 further includes a self-recovery fuse F1, a bidirectional transient suppression diode D1, a self-recovery fuse F2, a unidirectional transient suppression diode D2, a unidirectional transient suppression diode D3, a pull-up resistor R1, and a pull-down resistor R2, which are sequentially connected in series, an anode of the unidirectional transient suppression diode D2 is grounded, a cathode of the unidirectional transient suppression diode D2 is connected to a connection node between the self-recovery fuse F1 and the bidirectional transient suppression diode D1, an anode of the unidirectional transient suppression diode D3 is grounded, a cathode of the unidirectional transient suppression diode D3 is connected to a connection node between the bidirectional transient suppression diode D1 and the self-recovery fuse F2, one end of the pull-up resistor R1 is connected to one input end of the differential signal comparator unit, the other end of the pull-up resistor R1 is connected to the power supply, one end of the pull-down resistor R2 is. The power may be provided by a power regulation module.
The differential signal comparator unit adopts a differential signal comparator in a first chip SM 485U 2. Specifically, one end of the pull-up resistor R1 and a connection node of the self-healing fuse F1 and the unidirectional transient suppression diode D2 are connected to the pin 6 of the first chip SM 485U 2, one end of the pull-down resistor R2 and a connection node of the bidirectional transient suppression diode D1 and the self-healing fuse F2 are connected to the pin 7 of the first chip SM 485U 2, an a + signal of a differential signal input at a front stage is input to the pin 6 of the first chip SM 485U 2 through the self-healing fuse F1, a B-signal is input to the pin 7 of the first chip SM 485U 2 through the self-healing fuse F2, and the differential signal is converted into a corresponding TTL signal through a differential signal comparator inside the first chip SM 485U 2 and output to the signal isolation module 50 through the pin 1 of the first chip SM 485U 2. Under continuous high-voltage pulse, the self-recovery fuse F1 and the self-recovery fuse F2 are disconnected, and the rear-stage bidirectional transient suppression diode D1, the unidirectional transient suppression diode D2 and the unidirectional transient suppression diode D3 are prevented from being heated and damaged due to the absorption of excessive high-voltage pulse energy; after the signal is stabilized, the self-healing fuse F1 and the self-healing fuse F2 have low impedance and have no effect on the input signal. The arrangement of the unidirectional transient suppression diode D2 and the unidirectional transient suppression diode D3 can prevent the first chip SM 485U 2 from being instantaneously impacted by high-voltage high-frequency electromagnetic pulses, and protect the first chip SM 485U 2. 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 SM 485U 2, and the other end is connected to a power supply. The power may be provided by a power regulation module.
In the present embodiment, the voltage input/output characteristics of the differential signal can be seen in fig. 6, wherein the voltage of the differential signal a + signal is defined as VAThe voltage of the differential signal B-signal is defined as VB，VA-VBWhen the voltage is more than or equal to 200mV, the output voltage VOUTVCC is logic 1, VB-VAWhen the voltage is more than or equal to 200mV, the output voltage VOUTThe input characteristic is compatible with RS485 level, has strong common mode interference resistance and can be applied to 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 a corresponding differential signal and outputs the differential signal.
Further, referring to fig. 7, the differential signal output processing module 30 further includes a self-recovery fuse F3, a bidirectional transient suppression diode D4 and a self-recovery fuse F4 connected in series in sequence, 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 anode of the unidirectional transient suppression diode D5 is grounded, the cathode is connected to the connection node of the self-recovery fuse F3 and the bidirectional transient suppression diode D4, the anode of the unidirectional transient suppression diode D6 is grounded, the cathode is connected to the connection node of the bidirectional transient suppression diode D4 and the self-recovery fuse F4, one end of the pull-up resistor R3 is connected with one output end of the TTL logic level processor unit, the other end is connected with a power supply, one end of the pull-down resistor R4 is connected with the other output end of the TTL logic level processor unit, and the other end is grounded. The power may be provided by a power regulation module.
The TTL logic level processor unit adopts a TTL logic level processor in the second chip SM 485U 3, and 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 a connection node of the self-recovery fuse F4 and the unidirectional transient suppression diode D6 are connected to the pin 6 of the second chip SM 485U 3, and a connection node of the pull-down resistor R4 and the self-recovery fuse F3 and the unidirectional transient suppression diode D4 is connected to the pin 7 of the second chip SM 485U 3. Under continuous high-voltage pulse, the self-recovery fuse F3 and the self-recovery fuse F4 are disconnected, and the bidirectional transient suppression diode D4, the unidirectional transient suppression diode D5 and the unidirectional transient suppression diode D6 are prevented from being damaged by heat due to the fact that excessive high-voltage pulse energy is absorbed; after the signal is stabilized, the self-healing fuse F3 and the self-healing fuse F4 have low impedance and have no effect on the output signal. The arrangement of the unidirectional transient suppression diode D5 and the unidirectional transient suppression diode D6 can prevent the second chip SM 485U 3 from being instantaneously impacted by high-voltage high-frequency electromagnetic pulses, and protect the second chip SM 485U 3. The TTL signal output by the signal isolation module 50 is output to the pin 4 of the second chip SM 485U 3, and is converted into a corresponding differential signal by the TTL logic level processor inside the second chip SM 485U 3, the a + signal is output through the branch of the self-healing fuse F4, and the B-signal is output through the branch of the self-healing fuse F3.
In this embodiment, the address signal input processing module 20 includes a schmitt trigger unit for shaping an address signal input at a previous stage. The Schmitt trigger unit has two stable states, adopts a potential triggering mode, the states of the Schmitt trigger unit are maintained by input signals, and for the input signals with two different changing directions of negative descending and positive ascending, the Schmitt trigger unit has different threshold voltages, adopts the Schmitt trigger as the input stage of an address signal and can shape uneven digital signals. Wherein, the input voltage transfer characteristics of the Schmitt trigger unit can be seen in FIGS. 8 and 9, the address input signal voltage is derived from U-Rises to U through 0 point+Corresponding to an output voltage of U0HAddress signal slave U+Through VCC to U-Corresponding to an output voltage of U0L. Hysteresis voltage DeltaV in voltage transfer characteristicsT＝VT+-VT-＝VCC/3。
Specifically, referring to fig. 10, the schmitt trigger unit employs a chip 74LVC1G 17U 4, the address signal input processing module 20 further includes a self-recovery fuse F5, a unidirectional transient suppression diode D7, a resistor R6 and a capacitor C2, one end of the self-recovery fuse F5 is connected to a pin 2 of the chip 74LVC1G 17U 4, a resistor R6 and the unidirectional transient suppression diode D7 are connected in series between the power supply voltage stabilization module 70 and the ground and in parallel with the capacitor C2, a connection node of the resistor R6 and the unidirectional transient suppression diode D7 is connected to a pin 2 of the chip 74LVC1G 17U 4, a pin 5 of the chip 74LVC1G 17U 4 is connected to the power supply voltage stabilization module 70, and a pin 3 is connected to the ground. The address signal inputted from the previous stage is inputted to the chip 74LVC1G 17U 4 through the self-recovery fuse F5, and the shaped address signal is outputted from the pin 4 to the signal isolation module 50. The unidirectional transient suppression diode D7 prevents the chip 74LVC1G 17U 4 from being impacted by high-energy transient impact, and protects the chip 74LVC1G 17U 4. Under continuous high-voltage pulse, the self-recovery fuse F5 is broken, the rear-stage unidirectional transient suppression diode D7 is prevented from being damaged due to heating caused by excessive high-voltage pulse energy absorption, and after the signal is stabilized, the self-recovery fuse F5 is low in impedance and has no influence on the input signal.
Referring to fig. 11, the address signal output processing block 40 in the present embodiment includes a push-pull output circuit unit for push-pull outputting the address signal after the shaping processing. The push-pull output circuit unit can improve the output loading capacity of the address line. Specifically, the push-pull output circuit unit adopts a chip 74LVC2G 17U 5, a pin 3 of the chip 74LVC2G 17U 5 inputs an address signal output by the signal isolation module 50, the address signal output processing module 40 further includes a self-recovery fuse F6, a unidirectional transient suppression diode D8 and a capacitor C3, one end of the self-recovery fuse F6 is connected to a pin 4 of the chip 74LVC2G 17U 5, an anode of the unidirectional transient suppression diode D8 is grounded, and a cathode of the self-recovery fuse F6 is connected to a pin 4 of the chip 74LVC2G 17U 5. The address signal output by the signal isolation module 50 inputs the pin 4 of the chip 74LVC2G 17U 5, and is output from the push-pull output of the chip 74LVC2G 17U 5 via the self-healing fuse F6. The unidirectional transient suppression diode D8 prevents the chip 74LVC2G 17U 5 from being impacted by high-energy transient impact, and protects the chip 74LVC2G 17U 5. Under continuous high-voltage pulse, the self-recovery fuse F6 is broken, the one-way transient suppression diode D8 is prevented from being damaged due to heat generated by absorbing excessive high-voltage pulse energy, and after the signal is stabilized, the self-recovery fuse F5 presents low impedance and has no influence on the output signal.
The DMX512 signal amplifier 200 can be applied to an LED control system to isolate signals of the LED controller 100 lamp 300 at a user side, so that multi-point protection on a single bus is realized, and the DMX512 signal amplifier 200 can be compatible with single-polarity A + signal input, is suitable for a single-wire DMX512 lamp 300, is also compatible with RS485 communication, and can be applied to the field of RS485 simplex communication.
It should be understood that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some technical features; and all such modifications and alterations are intended to fall within the scope of the appended claims.
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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| CN202010796699.2A CN111954340A (en) | 2020-08-10 | 2020-08-10 | DMX512 signal amplifier and LED control system |
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