A DMX512 signal amplifier and LED control system

Abstract

The present invention relates to the field of lamp control, and 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 connected to the input end of the signal isolation module and serving as a front-stage input, and a differential signal output processing module and an address signal output processing module connected to the output end of the signal isolation module and serving as a rear-stage output. 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; 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. The present invention can achieve signal isolation of differential signals and address signals at the front-stage input and the rear-stage output, thereby improving the safety and stability of the LED control system.

Description

Technical Field

[0001] The invention relates to the field of lamp control, and in particular to a DMX512 signal amplifier and an LED control system. Background Art

[0002] In outdoor LED control systems, there is usually a distance of tens or hundreds of meters between the LED controller and the lamps, or between the lamps. Long-distance transmission will cause signal distortion and may be struck by lightning, causing damage to the entire LED control system.

[0003] In the existing LED control system, anti-static and high-voltage pulse protection is only added to the signal output port of the user-side LED controller to achieve signal isolation, but signal isolation cannot be achieved between lamps. It is easy for multiple interconnected lamps to fail to work properly due to damage to one lamp, resulting in poor security and stability of the entire LED control system. Summary of the invention

[0004] 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 problems that signal isolation between lamps and lamps in the existing LED control system cannot be achieved, and the safety and stability are poor.

[0005] 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 a lamp or between lamps, the DMX512 signal amplifier comprises a signal isolation module for isolating the input and output of a signal, a differential signal input processing module and an address signal input processing module connected to the input end of the signal isolation module and serving as a front-stage input, and a differential signal output processing module and an address signal output processing module connected to the output end of the signal isolation module and serving as a rear-stage output, wherein:

[0006] 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 the signal to the differential signal output processing module through the signal isolation module. The differential signal output processing module converts the converted TTL signal into a corresponding differential signal and then outputs it;

[0007] The address signal input processing module performs shaping processing on the input address signal and transmits the shaping signal to the address signal output processing module through the signal isolation module. The address signal output processing module outputs the shaped address signal.

[0008] A further preferred embodiment of the present invention is that the DMX512 signal amplifier also 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 the address signal output processing module are both connected to the output end of the signal isolation module through the signal synchronization module.

[0009] A further preferred embodiment of the present invention is that the DMX512 signal amplifier further includes a power supply stabilizing module and a power supply isolation module for providing voltage, the differential signal input processing module and the address signal input processing module are both connected to the power supply stabilizing module, and the differential signal output processing module and the address signal output processing module are both connected to the power supply stabilizing module via the power supply isolation module to perform power supply isolation between the front-stage input and the rear-stage output.

[0010] A further preferred solution of the present invention is that the signal isolation module includes a photoelectric coupler unit, which couples the input TTL signal and address signal to the output end and transmits them to the differential signal output processing module and the address signal output module respectively.

[0011] A further preferred embodiment of the present invention is that the differential signal input processing module includes a differential signal comparator unit whose output end is connected to 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 it to the signal isolation module.

[0012] A further preferred embodiment of the present invention is that the differential signal input processing module further includes a resettable fuse F1, a bidirectional transient suppression diode D1 and a resettable fuse F2, and 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 positive electrode of the unidirectional transient suppression diode D2 is grounded, and the negative electrode is connected to the connection node between the resettable fuse F1 and the bidirectional transient suppression diode D1, the positive electrode of the unidirectional transient suppression diode D3 is grounded, and the negative electrode is connected to the connection node between the bidirectional transient suppression diode D1 and the resettable fuse F2, one end of the pull-up resistor R1 is connected to one input end of the differential signal comparator unit, and the other end is connected to the power supply, and 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.

[0013] A further preferred embodiment 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 TTL signal into a corresponding differential signal and outputs the differential signal.

[0014] A further preferred embodiment of the present invention is that the differential signal output processing module also includes a resettable fuse F3, a bidirectional transient suppression diode D4 and a resettable fuse F4, and a unidirectional transient suppression diode D5, a unidirectional transient suppression diode D6, a pull-up resistor R3, and a pull-down resistor R4 connected in series in sequence, the positive electrode of the unidirectional transient suppression diode D5 is grounded, and the negative electrode is connected to the connection node between the resettable fuse F3 and the bidirectional transient suppression diode D4, the positive electrode of the unidirectional transient suppression diode D6 is grounded, and the negative electrode is connected to the connection node between 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 a 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.

[0015] 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.

[0016] The technical solution adopted by the present invention to solve its technical problem is: to provide an LED control system, including an LED controller and at least one lamp, and also including a DMX512 signal amplifier as described in any of the above, wherein the DMX512 signal amplifier is arranged between the LED controller and the lamp, or between one lamp and another lamp.

[0017] The beneficial effect of the present invention lies in that, compared with the prior art, by setting 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 perform shaping processing on the corresponding received differential signals and address signals, and the shaped signals are transmitted to the differential signal output processing module and the address signal output processing module of the subsequent stage via the signal isolation module, so as to achieve isolation of the differential signal and the address signal at the previous stage input and the subsequent stage output, thereby achieving signal isolation between the LED controller and the lamps, and between the lamps in the applied LED control system, achieving multi-point protection on a single bus, and improving the safety and stability of the LED control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0019] Figure 1 It is a structural block diagram of the LED control system of the present invention (DMX512 signal amplifier is applied between the LED controller and the lamp);

[0020] Figure 2It is a structural block diagram of the LED control system of the present invention (DMX512 signal amplifier is applied between lamps);

[0021] Figure 3 It is a structural block diagram of the DMX512 signal amplifier of the present invention;

[0022] Figure 4 is a circuit diagram of a power isolation module of the present invention;

[0023] Figure 5 is a circuit diagram of a differential signal input processing module of the present invention;

[0024] Figure 6 is a differential signal conversion characteristic diagram of the differential signal input processing module of the present invention;

[0025] Figure 7 is a circuit diagram of a differential signal output processing module of the present invention;

[0026] Figure 8 It is the waveform diagram of the address signal;

[0027] Fig. 9 It is a voltage transmission characteristic diagram of the address signal input processing module of the present invention;

[0028] Fig.10 is a circuit diagram of an address signal input processing module of the present invention;

[0029] Fig.11 It is a circuit diagram of the address signal output processing module of the present invention. DETAILED DESCRIPTION

[0030] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0031] 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. Figure 1 As shown, it is used for signal isolation between the LED controller 100 and the lamp 300; or it is provided between the lamps 300 and the lamps 300, such as Figure 2 As shown, it is used for signal isolation between lamps 300 and lamps 300 to improve the safety and stability of the LED control system.

[0032] like Figure 3 As shown, the present invention provides a preferred embodiment of a DMX512 signal amplifier 200 .

[0033] refer to Figure 3The DMX512 signal amplifier 200 includes a signal isolation module 50 for isolating the input and output of the signal, a differential signal input processing module 10 and an address signal input processing module 20 connected to the input end of the signal isolation module 50 and serving as a front-stage input, and a differential signal output processing module 30 and an address signal output processing module 40 connected to the output end of the signal isolation module 50 and serving as a rear-stage output, wherein the differential signal input processing module 10 performs shaping processing on the input differential signal, converts the input differential signal into a corresponding TTL signal, and transmits the signal 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 a corresponding differential signal and then outputs it; the address signal input processing module 20 performs shaping processing on the input address signal, and transmits the 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 address signal after shaping processing.

[0034] A differential signal input processing module 10 is set at the front-stage input to perform shaping processing on the input differential signal, and the differential signal is converted into a corresponding TTL signal. The address signal input processing module 20 performs shaping processing on the input address signal, and an address signal output processing module 40 and a differential signal output processing module 30 are set at the rear-stage output to respectively shape and output the differential signal and the address signal, and a signal isolation module 50 is set between the front-stage input and the rear-stage output to achieve signal isolation between the front-stage input and the rear-stage output, thereby achieving signal isolation between the LED controller 100 and the lamp 300, and between the lamps 300 and the lamps 300 in the applied LED control system, achieving multi-point protection on a single bus, and improving the safety and stability of the LED control system.

[0035] 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 lamps 300 and the lamps 300. The signal is easily distorted when transmitted over long distances or in a strong magnetic field environment. A differential signal input processing module 10 is set at the front-stage input to shape the differential signal, and an address signal input processing module 20 shapes the address signal so that the output signal can be decoded by the 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 disposed 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, the differential signal is transmitted to the differential signal input processing module 10, the address signal is transmitted 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 lamp, and the differential signal and the address signal are output to the lamp. The lamps are controlled; when the DMX512 signal amplifier 200 is arranged between the lamps 300 and the lamps 300, one 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 10, and the address signal is transmitted to the address signal input processing module 20, and the other lamp 300 is connected to the differential signal output processing module 30 and the address signal output processing module 40 of the DMX512 signal amplifier 200, and the differential signal is transmitted to the differential signal.

[0036] In this embodiment, in order to reduce the erroneous judgment of the lamp 300 when writing addresses and parameters and improve the success rate of address writing, the DMX512 signal amplifier 200 also includes a signal synchronization module 60 for performing equal delay processing on the converted TTL signal and the address signal after shaping, 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 can use 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 transmission delay problem between the input differential signal and the address signal.

[0037] Furthermore, 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 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 regulator module 70 can adopt a circuit of a buck topology structure to adapt to a wider external output voltage. In the scenario where the external power supply output voltage is too high, the power supply voltage regulator module 70 starts the buck working mode. In the scenario where the external power supply output voltage is undervoltage, the power supply voltage regulator module 70 starts the boost working mode and outputs a stable 5V voltage 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.

[0038] Further, the DMX512 signal amplifier 200 also 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 regulator module 70 through the power isolation module 80. The power isolation module 80 isolates the output voltage of the power supply 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, thereby realizing the isolation of the power supply between the front-stage input circuit and the rear-stage output circuit. By combining 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 front-stage input signal and the processing of the rear-stage output signal work separately without affecting each other. Therefore, the high-voltage pulse on the rear-stage output signal will not interfere with and damage the front-stage signal source, thereby improving the safety and stability of the overall system. In addition, the signal synchronization module 60 is also connected to the power supply voltage regulator module 70 through the power isolation module 80 to obtain the working voltage.

[0039] Specifically, refer to Figure 4 The power isolation module 80 includes a voltage stabilizing chip B0505S U1, a resistor R5 and a capacitor C1, and the resistor R5 and the capacitor C1 are connected in parallel between pin 3 and pin 4 of the voltage stabilizing chip B0505S U1. The resistor R5 is used as a power matching resistor to enable the power isolation module 80 to work in a high-efficiency output mode, and the capacitor C1 can play a filtering role.

[0040] In this embodiment, the signal isolation module 50 includes a photoelectric coupler unit, which couples the input TTL signal and address signal to the output end, and transmits them to the differential signal output processing module 30 and the address signal output processing module 40. The photoelectric coupler unit is used to apply coupling technology combined with the aforementioned power isolation to achieve signal isolation and power isolation between the front-stage input and the rear-stage output.

[0041] refer to Figure 5 The differential signal input processing module 10 in this embodiment includes a differential signal comparator unit whose output end is connected to the input end of the signal isolation module 50. The differential signal comparator unit converts the differential signal inputted at the previous stage into a corresponding TTL signal and transmits it to the signal isolation module 50.

[0042] Further, the differential signal input processing module 10 further includes a resettable fuse F1, a bidirectional transient suppression diode D1 and a resettable fuse F2, and a unidirectional transient suppression diode D2, a unidirectional transient suppression diode D3, a pull-up resistor R1, and a pull-down resistor R2 connected in series in sequence, the positive electrode of the unidirectional transient suppression diode D2 is grounded, and the negative electrode is connected to the connection node between the resettable fuse F1 and the bidirectional transient suppression diode D1, the positive electrode of the unidirectional transient suppression diode D3 is grounded, and the negative electrode is connected to the connection node between the bidirectional transient suppression diode D1 and the resettable fuse F2, one end of the pull-up resistor R1 is connected to one input end of the differential signal comparator unit, and the other end is connected to the 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. The power supply can be provided by a power supply voltage stabilizing module.

[0043] 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 self-recovery fuse F1 and the unidirectional transient suppression diode D2 are connected to pin 6 of the first chip SM485 U2, one end of the pull-down resistor R2 and the connection node of the bidirectional transient suppression diode D1 and the self-recovery fuse F2 are connected to pin 7 of the first chip SM485 U2, the A+ signal of the differential signal input from the previous stage is input to pin 6 of the first chip SM485 U2 through the self-recovery fuse F1, and the B- signal is input to pin 7 of the first chip SM485 U2 through the self-recovery fuse F2, and the differential signal is converted into a corresponding TTL signal by the differential signal comparator inside the first chip SM485 U2, and output from pin 1 of the first chip SM485 U2 to the signal isolation module 50. Under continuous high-voltage pulses, the resettable fuses F1 and F2 are disconnected to prevent the subsequent bidirectional transient suppression diodes D1, unidirectional transient suppression diodes D2 and unidirectional transient suppression diodes D3 from heating and being damaged due to absorbing too much high-voltage pulse energy; after the signal is stable, the resettable fuses F1 and F2 are low impedance and have no effect on the input signal. The setting of the unidirectional transient suppression diodes D2 and D3 can prevent the first chip SM485 U2 from being instantly impacted by high-voltage and high-frequency electromagnetic pulses, and protect the first chip SM485 U2. In this embodiment, the differential signal input processing module 10 also includes a resistor R6, one end of which is connected to pin 7 of the first chip SM485 U2, and the other end is connected to a power supply. The power supply can be provided by a power supply voltage stabilizing module.

[0044] In this embodiment, the differential signal voltage input and output voltage characteristics can be seen in Figure 6 , where the voltage of the differential signal A+ is defined as V A , the voltage of the differential signal B-signal is defined as V B , V A -V B ≥200mV, output voltage V OUT =VCC is logic 1, V B -V A ≥200mV, the output voltage V OUT =0 is logic 0. This input characteristic is compatible with RS485 level and has strong anti-common mode interference capability. It can be applied to RS485 simplex communication field.

[0045] 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. The TTL logic level processor unit converts the input TTL signal into a corresponding differential signal and outputs the differential signal.

[0046] Further, refer to Figure 7 , the differential signal output processing module 30 also includes a self-recovery fuse F3, a bidirectional transient suppression diode D4 and a self-recovery fuse F4, and a unidirectional transient suppression diode D5, a unidirectional transient suppression diode D6, a pull-up resistor R3, and a pull-down resistor R4 connected in series in sequence, the positive electrode of the unidirectional transient suppression diode D5 is grounded, and the negative electrode is connected to the connection node of the self-recovery fuse F3 and the bidirectional transient suppression diode D4, the positive electrode of the unidirectional transient suppression diode D6 is grounded, and the negative electrode 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 to an output end of the TTL logic level processor unit, and the other 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. The power supply can be provided by a power supply voltage stabilizing module.

[0047] 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 self-recovery fuse F4 and the unidirectional transient suppression diode D6 are connected to pin 6 of the second chip SM485 U3, and the connection node of the pull-down resistor R4 and the self-recovery fuse F3 and the unidirectional transient suppression diode D4 are connected to pin 7 of the second chip SM485 U3. Under continuous high-voltage pulses, the self-recovery fuse F3 and the self-recovery fuse F4 are disconnected to prevent the bidirectional transient suppression diode D4, the unidirectional transient suppression diode D5 and the unidirectional transient suppression diode D6 from heating and being damaged due to absorbing too much high-voltage pulse energy; after the signal is stable, the self-recovery fuse F3 and the self-recovery fuse F4 are low impedance and have no effect on the output signal. The unidirectional transient suppression diode D5 and the unidirectional transient suppression diode D6 can prevent the second chip SM485 U3 from being subjected to the instantaneous impact of the high-voltage and high-frequency electromagnetic pulse, and protect the second chip SM485 U3. The TTL signal output by the signal isolation module 50 is output to the 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. The A+ signal is output through the branch of the self-recovery fuse F4, and the B- signal is output through the branch of the self-recovery fuse F3.

[0048] In this embodiment, the address signal input processing module 20 includes a Schmitt trigger unit for shaping the address signal input from the previous stage. The Schmitt trigger unit has two stable states, using a potential trigger mode, and its state is maintained by the input signal. For input signals with two different change directions of negative decreasing and positive increasing, the Schmitt trigger unit has different threshold voltages. Using a Schmitt trigger as the input stage of the address signal can shape the uneven digital signal. Among them, the input voltage transfer characteristics of the Schmitt trigger unit can be referred to Figure 8 and Fig. 9 , the address input signal voltage is from U - After 0 point, rise to U + , the corresponding output voltage is U 0H , the address signal is from U + After VCC drops to U - , the corresponding output voltage is U 0L . The hysteresis voltage ΔV in the voltage transfer characteristic T =V T+ -V T- =V CC / 3.

[0049] Specifically, refer to Fig.10 The Schmitt trigger unit adopts chip 74LVC1G17 U4, and the address signal input processing module 20 also 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 pin 2 of the chip 74LVC1G17 U4, the resistor R6 and the unidirectional 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 connection node of the resistor R6 and the unidirectional transient suppression diode D7 is connected to pin 2 of the chip 74LVC1G17 U4, the pin 5 of the chip 74LVC1G17 U4 is connected to the power supply 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, and the shaped address signal is output from pin 4 to the signal isolation module 50. The unidirectional transient suppression diode D7 prevents the chip 74LVC1G17 U4 from being subjected to high-energy instantaneous impacts, and protects the chip 74LVC1G17 U4. Under continuous high-voltage pulses, the self-recovery fuse F5 is disconnected to prevent the subsequent unidirectional transient suppression diode D7 from heating and damage due to absorbing too much high-voltage pulse energy. After the signal stabilizes, the self-recovery fuse F5 presents low impedance and has no effect on the input signal.

[0050] refer to Fig.11The address signal output processing module 40 in this embodiment includes a push-pull output circuit unit for push-pull outputting the address signal after shaping. The push-pull output circuit unit can improve the output load capacity of the address line. Specifically, the push-pull output circuit unit adopts chip 74LVC2G17 U5, and the address signal output by the signal isolation module 50 is input to pin 3 of the chip 74LVC2G17 U5. The address signal output processing module 40 also 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 pin 4 of the chip 74LVC2G17 U5, and the positive electrode of the unidirectional transient suppression diode D8 is grounded, and the negative electrode is connected to pin 4 of the 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 pushed-pull output by the chip 74LVC2G17 U5 and output through the self-recovery fuse F6. The unidirectional transient suppression diode D8 prevents the chip 74LVC2G17 U5 from being subjected to high-energy instantaneous impacts, and protects the chip 74LVC2G17 U5. Under continuous high-voltage pulses, the self-recovery fuse F6 is disconnected to prevent the unidirectional transient suppression diode D8 from heating and damage due to absorbing too much high-voltage pulse energy. After the signal stabilizes, the self-recovery fuse F5 presents low impedance and has no effect on the output signal.

[0051] The DMX512 signal amplifier 200 of the present invention can be used in an LED control system to isolate the signals of the user-end LED controller 100 and the lamp 300 to achieve multi-point protection on a single bus. The DMX512 signal amplifier 200 is compatible with unipolar A+ signal input, suitable for single-line DMX512 lamps 300, and is also compatible with RS485 communication, and can also be used in the field of RS485 simplex communication.

[0052] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A DMX512 signal amplifier, used for signal isolation between LED controller and lamps or between lamps, characterized in that: The DMX512 signal amplifier includes a signal isolation module for isolating the input and output of the signal, a differential signal input processing module and an address signal input processing module connected to the input end of the signal isolation module and serving as a front-stage input, and a differential signal output processing module and an address signal output processing module connected to the output end of the signal isolation module and serving as a rear-stage output, 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 the signal to the differential signal output processing module through the signal isolation module. The differential signal output processing module converts the converted TTL signal into a corresponding differential signal and then outputs it; 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 address signal after the shaping processing; The DMX512 signal amplifier further comprises a signal synchronization module for performing equal delay processing on the converted TTL signal and the address signal after shaping processing, and the differential signal output processing module and the address signal output processing module are both connected to the signal isolation module through the signal synchronization module; The DMX512 signal amplifier also includes a power supply stabilizing module and a power supply isolation module for providing voltage. The differential signal input processing module and the address signal input processing module are both connected to the power supply stabilizing module. The differential signal output processing module and the address signal output processing module are both connected to the power supply stabilizing module through the power supply isolation module to perform power supply isolation between the front-stage input and the rear-stage output.

2. The DMX512 signal amplifier according to claim 1, characterized in that: The signal isolation module includes a photoelectric coupler unit, which couples the input TTL signal and address signal to the output end and transmits them to the differential signal output processing module and the address signal output processing module respectively.

3. The DMX512 signal amplifier according to claim 1, characterized in that: The differential signal input processing module includes a differential signal comparator unit whose output end is connected to the input end of the signal isolation module. The differential signal comparator unit converts the input differential signal into a corresponding TTL signal and transmits it to the signal isolation module.

4. The DMX512 signal amplifier according to claim 3, characterized in that: The differential signal input processing module also includes a resettable fuse F1, a bidirectional transient suppression diode D1 and a resettable fuse F2, and 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 connected in series in sequence. The positive electrode of the unidirectional transient suppression diode D2 is grounded, and the negative electrode is connected to the connection node between the resettable fuse F1 and the bidirectional transient suppression diode D1. The positive electrode of the unidirectional transient suppression diode D3 is grounded, and the negative electrode is connected to the connection node between the bidirectional transient suppression diode D1 and the resettable fuse F2. One end of the pull-up resistor R1 is connected to one input end of the differential signal comparator unit, and the other end is connected to the 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.

5. The DMX512 signal amplifier according to claim 1, characterized in 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. The TTL logic level processor unit converts the input TTL signal into a corresponding differential signal and outputs the differential signal.

6. The DMX512 signal amplifier according to claim 5, characterized in that: The differential signal output processing module also includes a resettable fuse F3, a bidirectional transient suppression diode D4 and a resettable fuse F4, as well as a unidirectional transient suppression diode D5, a unidirectional transient suppression diode D6, a pull-up resistor R3, and a pull-down resistor R4 connected in series in sequence. The positive electrode of the unidirectional transient suppression diode D5 is grounded, and the negative electrode is connected to the connection node between the resettable fuse F3 and the bidirectional transient suppression diode D4. The positive electrode of the unidirectional transient suppression diode D6 is grounded, and the negative electrode is connected to the connection node between 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 a 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.

7. The DMX512 signal amplifier according to claim 1, characterized in that: The address signal input processing module includes a Schmitt trigger unit for shaping the address signal input from the previous stage.

8. An LED control system, comprising an LED controller and at least one lamp, characterized in that: The LED control system further comprises a DMX512 signal amplifier as described in any one of claims 1 to 7, wherein the DMX512 signal amplifier is arranged between the LED controller and the lamp, or between one lamp and another lamp.

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