Isolation circuit, PCB and stage lamp for DMX signal transmission

Abstract

The utility model discloses a kind of isolation circuit, PCB and stage lamp for DMX signal transmission, isolation circuit includes voltage conversion unit and isolation unit, the isolation unit includes signal input part, signal output part and isolation chip U1, the output end of voltage conversion unit is connected with the pin VDD of isolation chip U1;Signal input part is connected with the signal input end of isolation chip U1, signal output part is connected with the signal output end of isolation chip U1;Signal input part and signal output part are used to connect the main control board of stage lamp;The isolation circuit disclosed in the present application, with isolation chip as core, in combination with power conversion, signal input and signal output, form complete DMX signal isolation solution;Replace traditional opto-coupler isolation technology by integrated chip, effectively reduce the required material quantity, and support miniaturization packaging, thereby reduce the demand to PCB area, solve the problem that traditional opto-coupler scheme is difficult to install due to larger size.

Description

Technical Field

[0001] This utility model relates to the field of signal isolation technology, and in particular to an isolation circuit, PCB board and stage light for DMX signal transmission. Background Technology

[0002] In the DMX512 signal transmission system, the key to ensuring stable data transmission lies in signal isolation and anti-interference design. Traditional optocoupler isolation solutions have large optocoupler devices and strict requirements for PCB layout space, which is difficult to meet the space-constrained application requirements, especially in miniaturized lamps or compact devices. In addition, optocoupler solutions have poor electromagnetic compatibility performance and are prone to EMI interference in signal conduction tests. Furthermore, their insulation design requires additional consideration of isolation spacing, which increases the complexity of safety certification.

[0003] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide an isolation circuit for DMX signal transmission, which uses an isolation chip to replace the traditional optocoupler technology, effectively reducing the area requirement of the PCB board and supporting miniaturized packaging, thereby effectively solving the problems encountered in the installation process of optocoupler solutions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An isolation circuit for DMX signal transmission includes a voltage conversion unit and an isolation unit. The isolation unit includes a signal input section, a signal output section, and an isolation chip U1. The input terminal of the voltage conversion unit is used to connect to an external power supply device, and the output terminal of the voltage conversion unit is connected to the VDD pin of the isolation chip U1. The signal input section is connected to the signal input terminal of the isolation chip U1, and the signal output section is connected to the signal output terminal of the isolation chip U1. The signal input section and the signal output section are used to connect to the main control board of a stage light.

[0007] In the isolation circuit for DMX signal transmission, the isolation chip U1 is model CA-IS3643.

[0008] In the isolation circuit for DMX signal transmission, the voltage conversion unit includes a step-down chip UM1, which is model 78L05. The input terminal of the step-down chip UM1 is used to connect to an external power supply device, and the output terminal of the step-down chip UM1 is connected to the VDD pin of the isolation chip U1.

[0009] In the isolation circuit for DMX signal transmission, the voltage conversion unit further includes a rectifier section and a first filter section. The input terminal of the rectifier section is used to connect to an external power supply device, and the output terminal of the rectifier section is connected to the VIN pin of the step-down chip UM1. The input terminal of the first filter section is connected to the Vout pin of the step-down chip UM1, and the output terminal of the first filter section is connected to the VDD pin of the isolation chip U1.

[0010] In the isolation circuit for DMX signal transmission, the isolation unit further includes a second filtering section and a first decoupling section. The output terminal of the voltage conversion unit is connected to the VDD pin of the isolation chip U1 through the second filtering section and the first decoupling section.

[0011] In the isolation circuit for DMX signal transmission, the voltage conversion unit further includes a third filter section and a second decoupling section, and the VISO pin of the isolation chip U1 is grounded through the third filter section and the second decoupling section.

[0012] In the isolation circuit for DMX signal transmission, the voltage conversion unit further includes a voltage divider, and the signal input terminal of the isolation chip U1 is connected to the signal input unit through the voltage divider.

[0013] In the DMX signal transmission isolation circuit, the signal input section includes a first connector J1, and the signal output section includes a second connector J2; pins 2 and 3 of the first connector J1 are respectively connected to pins VI4 and VI3 of the isolation chip U1; pins 2 and 3 of the second connector J2 are respectively connected to pins VO4 and VO3 of the isolation chip U1.

[0014] The present invention also provides a PCB board, characterized in that the PCB board is printed with an isolation circuit for DMX signal transmission as described above.

[0015] This utility model also provides a stage light, including a main control board, on which control circuits and signal transmission circuits are printed; the stage light also includes a PCB board as described above, the PCB board being electrically connected to the main control board, and the signal transmission circuit being electrically connected to the control circuit through the DMX signal transmission isolation circuit.

[0016] Beneficial effects:

[0017] This invention provides an isolation circuit for DMX signal transmission. With the isolation chip U1 as the core, it combines power conversion, signal input, and signal output to form a complete DMX signal isolation solution. This solution uses an integrated chip to replace the traditional optocoupler isolation technology, which effectively reduces the number of materials required and supports miniaturized packaging, thereby reducing the PCB area requirement. It is suitable for integrated applications of embedded lighting fixtures and solves the problem that traditional optocoupler solutions are difficult to install due to their large size. Attached Figure Description

[0018] Figure 1 The circuit schematic diagram of the isolation circuit for DMX signal transmission provided by this utility model;

[0019] Figure 2 Circuit structure diagram of the isolation unit provided by this utility model;

[0020] Figure 3 The circuit structure diagram of the voltage conversion unit provided by this utility model.

[0021] Explanation of key component symbols: 1-Isolation unit, 11-Signal input section, 12-Signal output section, 13-Second filter section, 14-First decoupling section, 15-Third filter section, 16-Second decoupling section, 17-Voltage divider section, 2-Voltage conversion unit, 21-Rectifier section, 22-First filter section. Detailed Implementation

[0022] This utility model provides an isolation circuit, PCB board, and stage light for DMX signal transmission. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments.

[0023] In the description of this utility model, it should be understood that the terms "installation" and "connection" should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] Please see Figures 1 to 3 This utility model provides an isolation circuit for DMX signal transmission, including a voltage conversion unit 2 and an isolation unit 1. The isolation unit 1 includes a signal input section 11, a signal output section 12, and an isolation chip U1. The input terminal of the voltage conversion unit 2 is used to connect to an external power supply device, and the output terminal of the voltage conversion unit 2 is connected to the VDD pin of the isolation chip U1. The signal input section 11 is connected to the signal input terminal of the isolation chip U1, and the signal output section 12 is connected to the signal output terminal of the isolation chip U1. The signal input section 11 and the signal output section 12 are used to connect to the main control board of a stage light.

[0025] In this embodiment, the isolation chip U1 is used to achieve electrical isolation between input and output signals. The external power supply is a +24V power supply, which is reduced to +5V by the voltage conversion unit 2 to provide a stable operating voltage for the isolation chip. The signal input unit 11 is used to receive DMX signals, and the signal output unit 12 is used to output isolated DMX signals. Through the modular design of voltage conversion and signal isolation, stable signal transmission is ensured, and a basic architecture is provided for subsequent circuit optimization, which is convenient for integrated design.

[0026] In this embodiment, the isolation chip U1 is model CA-IS3643. This chip uses magnetic isolation technology to replace the traditional optocoupler, achieving a volume reduction of more than 50%, which is suitable for compact PCB layouts. Its internal isolation structure has the ability to suppress electromagnetic interference conduction, which complies with the EN 55032 Class B standard and is suitable for electromagnetically sensitive scenarios. Moreover, the isolation layer inside the chip directly meets the basic insulation requirements of SELV / PELV, so there is no need to design an additional isolation gap. In other words, through the integrated design of the CA-IS3643 chip, the technical problems of insufficient ESD protection and large space occupation in traditional solutions are effectively overcome. Furthermore, through modular design, comprehensive optimization of cost, performance and safety is achieved.

[0027] This application discloses an isolation circuit for DMX signal transmission. Centered on an isolation chip U1, it integrates power conversion, signal input, and signal output to form a complete DMX signal isolation solution. This solution uses an integrated chip to replace traditional optocoupler isolation technology, effectively reducing the number of required materials and supporting miniaturized packaging, thereby reducing the PCB area requirement. It is suitable for integrated applications in embedded lighting fixtures and solves the problem of traditional optocoupler solutions being difficult to install due to their large size. Furthermore, the integrated chip replaces traditional optocoupler isolation technology, simplifying the manufacturing process, improving production efficiency, reducing production costs, and eliminating losses during photoelectric conversion because it eliminates the need for manual soldering of optocouplers.

[0028] Further, please refer to Figure 1 and Figure 3 The voltage conversion unit 2 includes a step-down chip UM1, which is model 78L05. The input terminal of the step-down chip UM1 is used to connect to an external power supply device, and the output terminal of the step-down chip UM1 is connected to the VDD pin of the isolation chip U1.

[0029] In this embodiment, the input terminal of the step-down chip UM1 is connected to an external power supply device, and its output terminal is connected to the VDD pin of the isolation chip UM1 to stably provide a +5V operating voltage to the isolation chip UM1. The 78L05 chip can convert the input +24V voltage to the +5V required by the isolation chip UM1, while ensuring that the voltage fluctuation does not exceed ±0.1V, thereby ensuring the stable operation of the isolation chip UM1. Since this design only requires a single +24V input, the power conversion stage can be simplified, effectively reducing material costs and circuit design complexity.

[0030] Further, please refer to Figure 1 and Figure 3 The voltage conversion unit 2 further includes a rectifier 21 and a first filter 22. The input terminal of the rectifier 21 is used to connect to an external power supply device, and the output terminal of the rectifier 21 is connected to the VIN pin of the step-down chip UM1. The input terminal of the first filter 22 is connected to the Vout pin of the step-down chip UM1, and the output terminal of the first filter 22 is connected to the VDD pin of the isolation chip U1.

[0031] In this embodiment, please refer to Figure 3 The rectifier section 21 is used to convert unstable DC power into smooth DC power to ensure stable input voltage polarity; the first filter section 22 is used to eliminate low-frequency and high-frequency noise to filter out power supply ripple; the rectifier section 21 includes a first diode D1, a first resistor R1 and a first capacitor C1, the positive terminal of the first diode D1 is used to connect to an external power supply device, the negative terminal of the first diode D1 is connected to one end of the first resistor R1, the other end of the first resistor R1 and one end of the first capacitor C1 are respectively connected to the pin Vin of the step-down chip UM1, and the other end of the first capacitor C1 is grounded; the first filter section 22 includes a second capacitor C2 and a third capacitor C3, the pin Vout of the step-down chip UM1, one end of the third capacitor C3 and one end of the second capacitor C2 are respectively connected to the pin VDD of the isolation chip U1.

[0032] Further, please refer to Figure 1 and Figure 2 The isolation unit 1 further includes a second filter section 13 and a first decoupling section 14. The output terminal of the voltage conversion unit 2 is connected to the VDD pin of the isolation chip U1 through the second filter section 13 and the first decoupling section 14.

[0033] In this embodiment, please refer to Figure 2The second filter section 13 is connected in series between the output terminal of the voltage conversion unit 2 and the VDD pin of the isolation chip U1 to filter out high-frequency interference and reduce interference coupling on the signal line; the first decoupling section 14 is connected in parallel between the VDD pin and the GND pin of the isolation chip U1 to provide transient current support and reduce the impact of power supply fluctuations on the isolation chip U1; the second filter section 13 includes a fifth capacitor C5, and the first decoupling section 14 includes a fourth capacitor C4. The Vout pin of the step-down chip UM1 is connected to one end of the fourth capacitor C4, one end of the fifth capacitor C5, and the VDD pin of the isolation chip U1, respectively; the other end of the fourth capacitor C4 and the other end of the fifth capacitor C5 are grounded, respectively.

[0034] Further, please refer to Figure 1 and Figure 2 The voltage conversion unit 2 further includes a third filter section 15 and a second decoupling section 16. The VISO pin of the isolation chip U1 is grounded through the third filter section 15 and the second decoupling section 16.

[0035] In this embodiment, please refer to Figure 2 The VISO pin of the isolation chip U1 is grounded through the third filter section 15, which can filter out parasitic interference of the isolation layer. The VISO pin grounding design blocks the input-output ground loop, and the common-mode rejection ratio is improved to over 60dB. In addition, the VISO pin of the isolation chip U1 is grounded through the second decoupling section 16, which can stabilize the potential of the isolation layer, ensure basic insulation performance, and meet the safety standard test requirements. The third filter section 15 includes a sixth capacitor C6 and a seventh capacitor C7, and the second decoupling section 16 includes an eighth capacitor C8. The VISO pin of the isolation chip U1 is connected to one end of the sixth capacitor C6, one end of the seventh capacitor C7, and one end of the eighth capacitor C8, respectively. The other ends of the sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8 are grounded respectively.

[0036] Further, please refer to Figure 1 and Figure 2 The voltage conversion unit 2 further includes a voltage divider 17, and the signal input terminal of the isolation chip U1 is connected to the signal input unit 11 through the voltage divider 17.

[0037] In this embodiment, the voltage divider 17 is used to limit the input signal voltage within the safe operating range of the isolation chip U1, avoiding damage to the isolation chip U1. This ensures that the signal amplitude after voltage division matches the input threshold of the isolation chip U1, improving signal transmission reliability and reducing logic misjudgments. The voltage divider 17 includes a second resistor R2 and a third resistor R3. Pin VI3 of the isolation chip U1 is connected to pin 3 of the first connector J1 through the second resistor R2, and pin VI4 of the isolation chip U1 is connected to pin 2 of the first connector J1 through the third resistor R3.

[0038] Further, please refer to Figure 1 and Figure 2 The signal input section 11 includes a first connector J1, and the signal output section 12 includes a second connector J2; pins 2 and 3 of the first connector J1 are respectively connected to pins VI4 and VI3 of the isolation chip U1; pins 2 and 3 of the second connector J2 are respectively connected to pins VO4 and VO3 of the isolation chip U1.

[0039] In this embodiment, the first connector J1 is used to receive DMX input signals, and the second connector J2 is used to output isolated DMX signals. The connector design facilitates quick plug-in and plug-out connection with the main control board, improves production and assembly efficiency, and reduces wiring length and EMI radiation risk.

[0040] The present invention also provides a PCB board, characterized in that the PCB board is printed with an isolation circuit for DMX signal transmission as described above.

[0041] This utility model also provides a stage light, including a main control board, on which control circuits and signal transmission circuits are printed; the stage light also includes a PCB board as described above, the PCB board being electrically connected to the main control board, and the signal transmission circuit being electrically connected to the control circuit through the DMX signal transmission isolation circuit.

[0042] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. An isolation circuit for DMX signal transmission, characterized in that, It includes a voltage conversion unit and an isolation unit. The isolation unit includes a signal input section, a signal output section, and an isolation chip U1. The input terminal of the voltage conversion unit is used to connect to an external power supply device, and the output terminal of the voltage conversion unit is connected to the VDD pin of the isolation chip U1. The signal input section is connected to the signal input terminal of the isolation chip U1, and the signal output section is connected to the signal output terminal of the isolation chip U1. The signal input section and the signal output section are used to connect to the main control board of the stage light.

2. The isolation circuit for DMX signal transmission according to claim 1, characterized in that, The isolation chip U1 is model CA-IS3643.

3. The isolation circuit for DMX signal transmission according to claim 1, characterized in that, The voltage conversion unit includes a step-down chip UM1, which is model 78L05. The input terminal of the step-down chip UM1 is used to connect to an external power supply device, and the output terminal of the step-down chip UM1 is connected to the VDD pin of the isolation chip U1.

4. The isolation circuit for DMX signal transmission according to claim 3, characterized in that, The voltage conversion unit further includes a rectifier section and a first filter section. The input terminal of the rectifier section is used to connect to an external power supply device, and the output terminal of the rectifier section is connected to the VIN pin of the buck chip UM1. The input terminal of the first filter section is connected to the Vout pin of the buck chip UM1, and the output terminal of the first filter section is connected to the VDD pin of the isolation chip U1.

5. The isolation circuit for DMX signal transmission according to claim 2, characterized in that, The isolation unit further includes a second filter section and a first decoupling section. The output terminal of the voltage conversion unit is connected to the VDD pin of the isolation chip U1 through the second filter section and the first decoupling section.

6. The isolation circuit for DMX signal transmission according to claim 2, characterized in that, The voltage conversion unit further includes a third filter section and a second decoupling section, and the VISO pin of the isolation chip U1 is grounded through the third filter section and the second decoupling section.

7. The isolation circuit for DMX signal transmission according to claim 2, characterized in that, The voltage conversion unit further includes a voltage divider section, and the signal input terminal of the isolation chip U1 is connected to the signal input section through the voltage divider section.

8. The isolation circuit for DMX signal transmission according to claim 2, characterized in that, The signal input section includes a first connector J1, and the signal output section includes a second connector J2; pins 2 and 3 of the first connector J1 are respectively connected to pins VI4 and VI3 of the isolation chip U1; pins 2 and 3 of the second connector J2 are respectively connected to pins VO4 and VO3 of the isolation chip U1.

9. A PCB board, characterized in that, The PCB board is printed with an isolation circuit for DMX signal transmission as described in any one of claims 1-8.

10. A stage light, comprising a main control board, wherein control circuitry and signal transmission circuitry are printed on the main control board, characterized in that, It also includes the PCB board as described in claim 9, wherein the PCB board is electrically connected to the main control board, and the signal transmission circuit is electrically connected to the control circuit through the isolation circuit for DMX signal transmission.

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