CN212569078U

CN212569078U - Detection circuit of DMX512 differential signal without signal ground wire

Info

Publication number: CN212569078U
Application number: CN202021331752.3U
Authority: CN
Inventors: 胡波; 隆新级
Original assignee: Foshan Yinhe Lanjing Technology Co ltd
Current assignee: Foshan Yinhe Lanjing Technology Co ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-02-19
Anticipated expiration: 2030-07-09

Abstract

The utility model discloses a detection circuitry of DMX512 difference signal of no signal ground wire, including signal protection circuit, conversion circuit is kept apart to the signal, signal reversal circuit, signal detection circuit and power supply circuit, signal protection circuit received lamps and lanterns signal and transmission signal to signal isolation conversion circuit, signal detection circuit includes A signal detection circuit and B signal detection circuit, the A signal of conversion circuit output is kept apart to A signal detection circuit received signal, the B signal of conversion circuit output is kept apart to B signal detection circuit received signal, be equipped with signal reversal circuit between B signal detection circuit and the signal isolation conversion circuit, signal isolation conversion circuit electric connection ground of referencing, power supply circuit includes 5V conversion circuit, 5V conversion circuit and signal detection circuit electric connection. By arranging the signal isolation conversion circuit, the DMX512 differential signal without reference to the ground is converted into the differential signal with reference to the ground, and then the signal detection circuit reads and detects the differential signal, so that the field detection of the lamp differential signal bus is realized.

Description

Detection circuit of DMX512 differential signal without signal ground wire

Technical Field

The utility model relates to a lamps and lanterns field of detection, in particular to no signal ground wire's DMX512 difference signal's detection circuitry.

Background

At present, in engineering implementation and lamp aging test of the DMX512 differential signals of the DMX512 lamp, the ground wire of the DMX512 controller is not connected with the ground wire of the power supply, so that transmission of the DMX512 differential signals on a bus is not influenced in normal use, but when the lamp fails, because the DMX512 differential signal wires of a plurality of lamps are connected in series by hands, when the signal failure is checked, a reference ground is required to be detected by an oscilloscope, and in actual engineering or product aging, the power ground is disconnected with the signal ground, so that whether the DMX512 differential signal wires have problems or not cannot be detected, and meanwhile, carrying the oscilloscope which is a large and valuable tool brings great inconvenience to field maintenance personnel in an aging area and an on-site, which is reflected in low efficiency and detection pole inconvenience.

The technical problem to be solved by the application is as follows: how to conveniently detect DMX512 differential signals in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a convenient DMX512 differential signal's of no signal ground wire detection circuit who has a problem at on-the-spot direct detection lamps and lanterns DMX512 differential signal line.

In order to achieve the above object, the present invention adopts the following technical solution that a DMX512 differential signal detection circuit without signal ground comprises a signal protection circuit, a signal isolation conversion circuit, a signal inversion circuit, a signal detection circuit and a power supply circuit, wherein the signal protection circuit receives a lamp signal and transmits the signal to the signal isolation conversion circuit, the signal detection circuit comprises an a signal detection circuit and a B signal detection circuit, the MCU1 and the MCU2 are correspondingly arranged, the A signal detection circuit receives an A signal output by the signal isolation conversion circuit, the B signal detection circuit receives a B signal output by the signal isolation conversion circuit, a signal reversing circuit is arranged between the B signal detection circuit and the signal isolation conversion circuit, the signal isolation conversion circuit is electrically connected with reference ground, the power supply circuit comprises a 5V conversion circuit, and the 5V conversion circuit is electrically connected with the signal detection circuit.

The utility model discloses no signal ground wire's DMX512 differential signal's detection circuitry, through setting up signal isolation converting circuit, DMX512 differential signal that will not refer to ground converts to the differential signal that has reference ground, whether rethread signal detection circuitry reads signal data and judges signal bus normal, wherein the B signal of differential signal passes through the signal reversal circuit and converts differential signal's A signal and input B signal detection circuitry, whether the pilot lamp through corresponding setting is lighted at last and gives directly perceived accurate testing result.

In some embodiments, the signal detection circuit a and the signal detection circuit B are respectively provided with an indicator light, and the indicator light emits light in a communication manner according to the detection result. The result is displayed by arranging the indicating lamp, and the display is visual and visible.

In some embodiments, the indicator light includes a red indicator light and a green indicator light, the green indicator light corresponds to a signal normal detection result, and the red indicator light corresponds to a signal abnormal detection result. Adopt green pilot lamp to represent normally respectively, red pilot lamp represents unusually, facilitates the use and observes.

In some embodiments, the power supply circuit further comprises a USB power supply interface electrically coupled with the signal detection circuit. The USB power supply interface is arranged, so that power supplies of a charger, a lamp, a computer and the like are convenient to use, and the field detection is convenient.

In some embodiments, the signal isolation conversion circuit is provided with an a signal port and a B signal port, and the a signal port and the B signal port are externally connected with an oscilloscope. The A, B signal port is arranged, so that an external oscilloscope is convenient to connect, whether the DMX512 differential signal is normal or not is directly detected, and aging test and engineering debugging detection are convenient.

In some embodiments, both the MCU1 and the MCU2 of the signal detection circuit employ STM8S003F3 chips, and the third pins of the MCU1 and the MCU2 are connected to the signal to be detected and output the detection result signal via the sixteenth and seventeenth pins.

The utility model has the advantages that: the utility model discloses detection circuitry of DMX512 difference signal of no signal ground wire, through setting up signal isolation converting circuit, will not have the DMX512 difference signal of reference ground to convert into the difference signal that has the reference ground, whether rethread signal detection circuit reads signal data and judges signal bus normal, reflects the testing result through red and green LED lamp at last, very directly perceived; the integrated structure is small, the carrying is convenient, and the method can be applied to most lamp aging tests and field signal fault troubleshooting controlled by using DMX512 signals; a USB power supply interface is arranged, and the low-voltage direct current 12V-48V power supply is compatible, so that the power can be conveniently taken on site; and an external signal port is additionally arranged, so that the oscilloscope is conveniently mounted, and the detection or the aging test and the engineering debugging can be directly carried out.

Drawings

Fig. 1 is a schematic diagram of a logic circuit of a DMX512 differential signal detection circuit without a signal ground line according to the present invention;

fig. 2 is a schematic circuit diagram of the signal protection circuit of the present invention;

fig. 3 is a schematic circuit diagram of the signal isolation and conversion circuit of the present invention;

fig. 4 is a schematic circuit diagram of the signal detection circuit of the present invention;

fig. 5 is a schematic circuit diagram of the B signal detection circuit of the present invention;

FIG. 6 is a schematic diagram of the signal reversing circuit and the indicator light according to the present invention;

fig. 7 is a schematic diagram of the circuit principle of the power supply circuit of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, the detection circuit of DMX512 differential signal without signal ground includes a signal protection circuit 1, a signal isolation conversion circuit 2, a signal inversion circuit 3, a signal detection circuit and a power supply circuit 5, the signal protection circuit 1 receives a lamp signal and transmits the signal to the signal isolation conversion circuit 2, the signal detection circuit includes an a signal detection circuit 41 and a B signal detection circuit 42, the MCU1 and the MCU2 are correspondingly arranged, the A signal detection circuit 41 receives an A signal output by the signal isolation conversion circuit 2, the B signal detection circuit 42 receives a B signal output by the signal isolation conversion circuit 2, a signal reversing circuit 3 is arranged between the B signal detection circuit 42 and the signal isolation conversion circuit 2, the signal isolation conversion circuit 2 is electrically connected with a reference ground, the power supply circuit 5 comprises a 5V conversion circuit, and the 5V conversion circuit is electrically connected with the signal detection circuit.

The signal detection circuit 41A and the signal detection circuit 42B are respectively and correspondingly provided with an indicator light, and the indicator lights are communicated to emit light corresponding to the detection result.

The pilot lamp includes red pilot lamp and green pilot lamp, and the green pilot lamp corresponds the normal testing result of signal, and the red pilot lamp corresponds the unusual testing result of signal.

The power supply circuit 5 further comprises a USB power supply interface 51, and the USB power supply interface 51 is electrically connected with the signal detection circuit.

The signal isolation conversion circuit 2 is provided with an A signal port and a B signal port, and the A signal port and the B signal port are externally connected with an oscilloscope.

Fig. 2 to 7 are specific schematic circuit diagrams of this embodiment, wherein:

as shown in fig. 2, which is a schematic circuit diagram of the signal protection circuit 1 of this embodiment, signals at the signal access terminals DAI and DBI are accessed to A, B signals, and circuit protection is performed through the fuse resistors F1 and F2, and two zener diodes T1 and T2 are provided for circuit protection.

As shown in fig. 3, which is a schematic diagram of the circuit principle of the signal isolation conversion circuit 2 of this embodiment, AA and BB signals from the signal protection circuit 1 pass through the chip ADUM1200, and finally output a signal a _ RXD to the a signal detection circuit 41 and a signal B to the signal inversion circuit 3.

As shown in fig. 4 and 5, which are schematic circuit diagrams of the signal detection circuit A, B of this embodiment,

the MCU1 and the MCU2 of the signal detection circuit both adopt STM8S003F3 chips, third pins of the MCU1 and the MCU2 are connected with signals to be detected, the signals are respectively from A _ RXD of the signal isolation conversion circuit 2 and B _ RXD of the signal reversing circuit 3, and detection result signals PG1, PR1, PWM1 and PWM2 are respectively output by sixteenth and seventeenth pins to the indicator light circuit.

As shown in fig. 6, which is a schematic diagram of the signal reversing circuit 3 and the indicator lamp of the present embodiment,

the signal reversing circuit 3 chip U3 adopts a 74HCT04 chip, wherein a first pin of U3 is connected with a B signal transmitted by the signal protection circuit 1, and B _ RXD is output to the MCU2 of the B signal detection circuit 42 from a second pin;

the same U3 chip is adopted for control of the indicator lamps, the third, fifth, ninth and eleventh pins of the U3 chip are respectively connected with detection result signals from the MCU1 and the MCU2, control signals of the four indicator lamps are output through the fourth, sixth, eighth and tenth pins, and the detection results are displayed through the four indicator lamps.

As shown in fig. 7, which is a schematic diagram of a circuit principle of the power supply circuit 5 in this embodiment, the circuit is compatible with low-voltage dc 12V to 48V, and is converted into 5V dc for supplying power.

The utility model discloses detection circuitry of DMX512 difference signal of no signal ground wire, through setting up signal isolation converting circuit, will not have the DMX512 difference signal of reference ground to convert into the difference signal that has the reference ground, whether rethread signal detection circuit reads signal data and judges signal bus normal, reflects the testing result through red and green LED lamp at last, very directly perceived; the integrated structure is small, the carrying is convenient, and the method can be applied to most lamp aging tests and field signal fault troubleshooting controlled by using DMX512 signals; a USB power supply interface is arranged, and the low-voltage direct current 12V-48V power supply is compatible, so that the power can be conveniently taken on site; and an external signal port is additionally arranged, so that the oscilloscope is conveniently mounted, and the detection or the aging test and the engineering debugging can be directly carried out.

What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.

Claims

1. The detection circuit of the DMX512 differential signal without the signal ground wire is characterized by comprising a signal protection circuit, a signal isolation conversion circuit, a signal inversion circuit, a signal detection circuit and a power supply circuit, the signal protection circuit receives a lamp signal and transmits the signal to the signal isolation conversion circuit, the signal detection circuit comprises an A signal detection circuit and a B signal detection circuit, the MCU1 and the MCU2 are correspondingly arranged, the A signal detection circuit receives an A signal output by the signal isolation conversion circuit, the B signal detection circuit receives the B signal output by the signal isolation conversion circuit, a signal reversing circuit is arranged between the B signal detection circuit and the signal isolation conversion circuit, the signal isolation conversion circuit is electrically connected with reference ground, the power supply circuit comprises a 5V conversion circuit, and the 5V conversion circuit is electrically connected with the signal detection circuit.

2. The circuit for detecting the DMX512 differential signal of the no-signal ground wire of claim 1, wherein the A signal detection circuit and the B signal detection circuit are respectively and correspondingly provided with an indicator light, and the indicator lights are communicated to emit light corresponding to the detection result.

3. The DMX512 differential signal detection circuit without signal ground of claim 2 wherein the indicator lights comprise a red indicator light and a green indicator light, the green indicator light corresponding to a signal normal detection result and the red indicator light corresponding to a signal abnormal detection result.

4. The signal-ground-free DMX512 differential signal detection circuit according to claim 1, wherein the power supply circuit further comprises a USB power supply interface, the USB power supply interface being electrically coupled to the signal detection circuit.

5. The circuit for detecting the DMX512 differential signal without the signal ground of claim 1, wherein the signal isolation conversion circuit is provided with an A signal port and a B signal port, and the A signal port and the B signal port are externally connected with an oscilloscope.

6. The detection circuit for the DMX512 differential signal without the signal ground of claim 1, wherein an MCU1 and an MCU2 of the signal detection circuit both adopt STM8S003F3 chips, third pins of the MCU1 and the MCU2 are connected to signals to be detected, and detection result signals are output by sixteenth and seventeenth pins.