Communication circuit and light control system
The communication circuit with isolation circuits and DMX512 protocol addresses connectivity and safety issues, enhancing device connectivity and reducing maintenance costs by isolating input and output signals.
Patent Information
- Application Number
- CN202422102648.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-08-28
AI Technical Summary
The existing communication circuit access equipment is small, and it is easy to damage other circuits when the electrical signal suddenly changes, which has poor safety and high maintenance costs.
Using a combination of a control circuit, a first isolation circuit, a second isolation circuit and a signal forwarding circuit, a DMX512 circuit is used to achieve signal isolation, increase the number of equipment access and avoid signal interference, and an isolated power supply is achieved through a third isolation circuit, and the signal protection circuit prevents fault damage.
The signal isolation between the control circuit and the signal forwarding circuit is realized, signal interference is avoided, the number of equipment access is increased, the safety and reliability of the circuit is improved, and maintenance costs are reduced.
Smart Images
Figure CN223108290U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of communication circuits. Specifically, this application relates to a communication circuit and a lighting control system. Background Art
[0002] With the development of society and technology, the centralized control of multiple devices such as street lights, speakers, and cameras has become increasingly common. To achieve the centralized control of devices, it is necessary to use a communication circuit to implement signal transmission.
[0003] In the prior art, a communication circuit uses a signal forwarding circuit to connect a control circuit and a controlled device, and transmits the signal of the control circuit to the controlled device or transmits the signal sent by the controlled device to the control circuit through the signal forwarding circuit. However, this way of directly connecting the signal forwarding circuit to the control circuit easily leads to the connection and interference between the input signal and the output signal, reducing the number of connected controlled devices. Moreover, when an electrical signal mutation occurs in one of the circuits (such as a voltage mutation or a short circuit), the electrical signal is transmitted to other circuits that have not undergone signal mutation, thereby causing damage to other circuits, reducing the safety of the communication circuit and increasing the maintenance cost of the circuit. Summary of the Utility Model
[0004] Embodiments of this application provide a communication circuit and a lighting control system, which can solve the problems of the existing communication circuit having a small number of connected devices, being easily damaged to other circuits during electrical signal mutation, poor safety, and high circuit maintenance cost.
[0005] To achieve this purpose, the embodiments of this application provide the following several solutions.
[0006] According to one aspect of the embodiments of this application, a communication circuit is provided, including a control circuit, a first isolation circuit, a second isolation circuit, and a signal forwarding circuit. The control circuit is respectively connected to the signal forwarding circuit through the first isolation circuit and the second isolation circuit. The signal forwarding circuit includes a DMX512 circuit;
[0007] The first isolation circuit is used to send a first isolation signal to the signal forwarding circuit, and the first isolation signal is generated based on the signal sent by the control circuit;
[0008] The second isolation circuit is used to send a second isolation signal to the control circuit, and the second isolation signal is generated based on the signal sent by the signal forwarding circuit.
[0009] In a possible implementation, a third isolation circuit is further included. The third isolation circuit is respectively connected to the signal forwarding circuit and the control circuit, and the third isolation circuit is used to realize the isolated power supply of the control circuit to the signal sending circuit.
[0010] In a possible implementation, the third isolation circuit is respectively connected to the output end of the first isolation circuit and the input end of the second isolation circuit;
[0011] The third isolation circuit includes an isolation power supply, a twenty-first capacitor, a second capacitor, a twenty-second capacitor, and a third capacitor. The first end of the twenty-first capacitor is connected to the power supply end of the control circuit, the first end of the second capacitor, and the first input end of the isolation power supply. The second end of the twenty-first capacitor is connected to the ground end of the control circuit, the second end of the second capacitor, and the second input end of the isolation power supply. The first output end of the isolation power supply is connected to the first end of the twenty-second capacitor, the first end of the third capacitor, and the first input end of the signal forwarding circuit. The second end of the twenty-second capacitor is grounded and is connected to the second output end of the isolation power supply, the second output end of the third capacitor, and the second output end of the signal forwarding circuit.
[0012] In a possible implementation, the first isolation circuit includes a first digital isolator, a forty-third resistor, a forty-eighth resistor, a fifty-fourth resistor, a thirty-ninth resistor, a forty-sixth resistor, and a fifty-third resistor. The first voltage terminal of the first digital isolator is connected to the power supply terminal of the control circuit. The first ground terminal of the first digital isolator is grounded. The first signal input terminal of the first digital isolator is connected to the control circuit through the forty-third resistor. The second signal output terminal is connected to the second end of the forty-eighth resistor and the first end of the fifty-fourth resistor. The second end of the fifty-fourth resistor is grounded. The first end of the forty-eighth resistor is connected to the control circuit. The second voltage terminal of the first digital isolator, the first end of the thirty-ninth resistor, and the first end of the forty-sixth resistor are connected to the first end of the twenty-second capacitor. The second end of the thirty-ninth resistor is connected to the signal forwarding circuit and the first signal output terminal of the first digital isolator. The second end of the forty-sixth resistor is connected to the second end of the fifty-third resistor and the signal forwarding circuit. The first end of the fifty-third resistor is connected to the second signal output terminal of the first digital isolator. The second ground terminal of the first digital isolator is grounded.
[0013] In a possible implementation, the second isolation circuit includes a sixty-fourth resistor, a sixty-sixth resistor, a second digital isolator, a sixty-third resistor, and a sixty-fifth resistor. The second signal input terminal of the second digital isolator is connected to the second ends of the sixty-fourth resistor and the sixty-sixth resistor. The first end of the sixty-fourth resistor is connected to the control circuit. The first end of the sixty-sixth resistor is grounded. The second signal output terminal of the second digital isolator is connected to the first ends of the sixty-fifth resistor and the sixty-third resistor. The second end of the sixty-third resistor is connected to the signal forwarding circuit. The second end of the sixty-fifth resistor is connected to the first end of the twenty-second capacitor.
[0014] In a possible implementation, the signal forwarding circuit includes a repeater and a fiftieth resistor. The voltage terminal of the repeater is connected to the first end of the twenty-second capacitor. The signal receiving terminal of the repeater is connected to the output terminal of the first isolation circuit. The signal sending terminal of the repeater is connected to the input terminal of the second isolator circuit. The first end of the fiftieth resistor is connected to the first differential signal terminal of the repeater. The second end of the fiftieth resistor is connected to the second differential signal terminal of the repeater.
[0015] In a possible implementation, a signal protection circuit is further included. The signal protection circuit is connected to the first isolation circuit and the second isolation circuit through the signal forwarding circuit.
[0016] In a possible implementation, the signal protection circuit includes a first fuse and a second fuse. The first end of the first fuse is connected to the first differential signal terminal. The second end of the second fuse is connected to the second differential signal terminal.
[0017] In a possible implementation, the signal protection circuit further includes a first transient suppression diode, a second transient suppression diode, a forty-first resistor, and a fifty-second resistor. The anode of the second transient suppression diode is connected to the first differential signal terminal and the first end of the forty-first resistor. The cathode of the second transient suppression diode is connected to the cathode of the first transient suppression diode and grounded. The anode of the first transient suppression diode is connected to the second end of the fiftieth resistor and the first end of the fifty-second resistor. The second end of the fifty-second resistor is grounded.
[0018] According to one aspect of the embodiments of the present application, a lighting control system is provided. The lighting control system includes the communication circuit as described above.
[0019] The beneficial effects brought by the technical solutions provided by the embodiments of the present application are:
[0020] In the communication circuit provided by the present application, the control circuit is respectively connected to the signal forwarding circuit through the first isolation circuit and the second isolation circuit. The signal forwarding circuit includes a DMX512 circuit. The first isolation circuit is used to send a first isolation signal to the signal forwarding circuit, and the first isolation signal is generated based on the signal sent by the control circuit. The second isolation circuit is used to send a second isolation signal to the control circuit, and the second isolation signal is generated based on the signal sent by the signal forwarding circuit. The embodiments of the present application can isolate the input signal and the output signal between the control circuit and the signal forwarding circuit, avoid interference between signals, effectively increase the number of access devices, and can improve the safety and reliability of the circuit and reduce the maintenance cost of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for the description in the embodiments of the present application.
[0022] Figure 1 It is a structural diagram of the communication circuit provided by the embodiment of the present application;
[0023] Figure 2 It is a circuit diagram of the control circuit provided by the embodiment of the present application;
[0024] Figure 3 It is a circuit diagram of the third isolation circuit provided by the embodiment of the present application;
[0025] Figure 4 It is a circuit diagram of the first isolation circuit, the second isolation circuit and the signal forwarding circuit provided by the embodiment of the present application;
[0026] Figure 5 It is a structural diagram of the lighting control system provided by the embodiment of the present application.
[0027] Label description: U2, single-chip microcomputer; J4, fourth interface; R31, thirty-first resistor; C16, sixteenth capacitor; C5, fifth capacitor; C6, sixth capacitor; X1, first crystal oscillator; U6, isolated power supply; C21, twenty-first capacitor; CU2, second capacitor; C22, twenty-second capacitor; CU3, third capacitor; C4, fourth capacitor; C28, twenty-eighth capacitor; C29, twenty-ninth capacitor; C27, twenty-seventh capacitor; C26, twenty-sixth capacitor; U9, first digital isolator; R43, forty-third resistor; R48, forty-eighth resistor; R54, fifty-fourth resistor; R39, thirty-ninth resistor; R46, forty-sixth resistor; R53, fifty-third resistor; R64, sixty-fourth resistor; R66, sixty-sixth resistor; U12, second digital isolator; R63, sixty-third resistor; R65, sixty-fifth resistor; R50, fiftieth resistor; U10, repeater; F1, first fuse; F2, second fuse; Z1, first transient suppression diode; Z2, second transient suppression diode; R41, forty-first resistor; R52, fifty-second resistor; R56, fifty-sixth resistor. Detailed implementation manners
[0028] The embodiments of the present application will be described below with reference to the accompanying drawings in the present application. It should be understood that the implementation manners described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions of the embodiments of the present application.
[0029] Those skilled in the art of the present technology can understand that, unless specifically stated otherwise, the singular forms "a", "an", "the" and "said" used herein may also include the plural forms. It should be further understood that the terms "including" and "comprising" used in the embodiments of the present application mean that the corresponding features can be implemented as the presented features, information, data, steps, operations, elements and / or components, but do not exclude the implementation of other features, information, data, steps, operations, elements, components and / or their combinations supported by the art of the present technology. It should be understood that when we say an element is "connected" or "coupled" to another element, the one element can be directly connected or coupled to the other element, or it can mean that the one element and the other element establish a connection relationship through an intermediate element. In addition, the "connection" or "coupling" used here can include wireless connection or wireless coupling. The term "and / or" used here indicates at least one of the items defined by the term, for example, "A and / or B" indicates being implemented as "A", or being implemented as "A", or being implemented as "A and B".
[0030] To make the purpose, technical solutions and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings.
[0031] The technical solutions of the embodiments of the present invention and the technical effects brought about by the technical solutions of the present invention will be described below through the description of several exemplary embodiments. It should be noted that the following embodiments can be referred to, learned from, or combined with each other. For the same terms, similar features, and similar implementation steps in different embodiments, they will not be described repeatedly.
[0032] The communication circuit and the lighting control system provided in this application are intended to solve at least one technical problem existing in the prior art.
[0033] In an embodiment of this application, a communication circuit is provided, as Figures 1 - 4 shown. This communication circuit can be used in a lighting control system. The communication circuit includes a control circuit, a first isolation circuit, a second isolation circuit, and a signal forwarding circuit. The control circuit is respectively connected to the signal forwarding circuit through the first isolation circuit and the second isolation circuit. The signal forwarding circuit includes a DMX512 circuit. The first isolation circuit is used to send a first isolation signal to the signal forwarding circuit, and the first isolation signal is generated based on the signal sent by the control circuit. The second isolation circuit is used to send a second isolation signal to the control circuit, and the second isolation signal is generated based on the signal sent by the signal forwarding circuit.
[0034] Optionally, the control circuit may include a single-chip microcomputer U2, and signals are sent to the signal forwarding circuit or signals sent by the signal forwarding circuit are received through this single-chip microcomputer U2.
[0035] In one embodiment, the single-chip microcomputer U2 can be a 32-bit microcontroller based on the ARM Cortex-M0 kernel, the capacity of its program memory is 64KB, and the model can be NUC029LAN.
[0036] Specifically, the control circuit may further include a fourth interface J4, a thirty-first resistor R31, and a sixteenth capacitor C16. The third pin, the fourth pin, and the fifth pin of the fourth interface J4 are respectively connected to the single-chip microcomputer U2. The first end of the thirty-first resistor R31 is connected to the power supply, the second end is connected to the third pin of the fourth interface J4 and the first end of the sixteenth capacitor C16, and the second end of the sixteenth capacitor C16 is grounded.
[0037] Optionally, the control circuit may further include a fifth capacitor C5, a sixth capacitor C6, and a first crystal oscillator X1. The first end of the fifth capacitor C5 is grounded and connected to the first end of the sixth capacitor C6. The second end of the fifth capacitor C5 is connected to the first end of the first crystal oscillator X1 and the fifteenth pin of the single-chip microcomputer U2. The second end of the first crystal oscillator X1 is connected to the second end of the sixth capacitor C6 and the sixteenth pin of the single-chip microcomputer U2.
[0038] Optionally, for isolated power supply, the communication circuit further includes a third isolation circuit, which is respectively connected to the signal forwarding circuit and the control circuit, and is used to achieve isolated power supply from the control circuit to the signal sending circuit.
[0039] Optionally, the third isolation circuit is respectively connected to the output end of the first isolation circuit and the input end of the second isolation circuit; the third isolation circuit includes an isolation power supply U6, a twenty-first capacitor C21, a second capacitor CU2, a twenty-second capacitor C22, and a third capacitor CU3. The first end of the twenty-first capacitor C21 is connected to the power supply end of the control circuit, the first end of the second capacitor CU2, and the first input end of the isolation power supply U6. The second end of the twenty-first capacitor C21 is connected to the ground end of the control circuit, the second end of the second capacitor CU2, and the second input end of the isolation power supply U6. The first output end of the isolation power supply U6 is connected to the first end of the twenty-second capacitor, the first end of the third capacitor CU3, and the first input end of the signal forwarding circuit. The second end of the twenty-second capacitor C22 is grounded and is connected to the second output end of the isolation power supply U6, the second output end of the third capacitor CU3, and the second output end of the signal forwarding circuit.
[0040] In one embodiment, the model of the isolation power supply U6 can be ZY0505BLS-1W, and the voltage signal output by the control circuit is converted into an electrical signal that is not connected to the microcontroller U2 through the isolation power supply U6. Among them, the third isolation circuit may further include a fourth capacitor C4, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, a twenty-seventh capacitor C27, and a twenty-sixth capacitor C26. The first end of the fourth capacitor C4 is connected to the power supply connected to the microcontroller U2, and the second end of the fourth capacitor C4 is grounded. The first ends of the twenty-eighth capacitor C28 and the twenty-ninth capacitor C29 are connected to the power supply, and the second ends of the twenty-eighth capacitor C28 and the twenty-ninth capacitor C29 are grounded. The first ends of the twenty-seventh capacitor C27 and the twenty-sixth capacitor C26 are connected to the first end of the twenty-second capacitor C22, and the second end of the twenty-seventh capacitor C27 is grounded and is connected to the second end of the twenty-sixth capacitor C26.
[0041] Optionally, the first isolation circuit includes a first digital isolator U9, a forty-third resistor R43, a forty-eighth resistor R48, a fifty-fourth resistor R54, a thirty-ninth resistor R39, a forty-sixth resistor R46, and a fifty-third resistor R53. The first voltage terminal of the first digital isolator U9 is connected to the power supply terminal of the control circuit. The first ground terminal of the first digital isolator U9 is grounded. The first signal input terminal of the first digital isolator U9 is connected to the control circuit through the forty-third resistor R43. The second signal output terminal is connected to the second terminal of the forty-eighth resistor R48 and the first terminal of the fifty-fourth resistor R54. The second terminal of the fifty-fourth resistor R54 is grounded. The first terminal of the forty-eighth resistor R48 is connected to the control circuit. The second voltage terminal of the first digital isolator U9, the first terminal of the thirty-ninth resistor R39, and the first terminal of the forty-sixth resistor R46 are connected to the first terminal of the twenty-two capacitor. The second terminal of the thirty-ninth resistor R39 is connected to the signal forwarding circuit and the first signal output terminal of the first digital isolator U9. The second terminal of the forty-sixth resistor R46 is connected to the second terminal of the fifty-third resistor R53 and the signal forwarding circuit. The first terminal of the fifty-third resistor R53 is connected to the second signal output terminal of the first digital isolator U9. The second ground terminal of the first digital isolator U9 is grounded.
[0042] Optionally, the second isolation circuit includes a sixty-fourth resistor R64, a sixty-sixth resistor R66, a second digital isolator U12, a sixty-third resistor R63, and a sixty-fifth resistor R65. The second signal input terminal of the second digital isolator U12 is connected to the second terminal of the sixty-fourth resistor R64 and the second terminal of the sixty-sixth resistor R66. The first terminal of the sixty-fourth resistor R64 is connected to the control circuit. The first terminal of the sixty-sixth resistor R66 is grounded. The second signal output terminal of the second digital isolator U12 is connected to the first terminal of the sixty-fifth resistor R65 and the first terminal of the sixty-third resistor R63. The second terminal of the sixty-third resistor R63 is connected to the signal forwarding circuit. The second terminal of the sixty-fifth resistor R65 is connected to the first terminal of the twenty-two capacitor C22.
[0043] In one embodiment, the first digital isolator U9 and the second digital isolator U12 can both be dual-channel digital isolators, and their models can be the same, both being ADUM1200. Specifically, the signals received by the first data isolator from the microcontroller U2 are DMX_CON and TXD, and DMX_CON1 and TXD1 are correspondingly output according to these two signals. The first voltage terminal of the first digital isolator U9 is connected to the power supply corresponding to the control circuit. The signal output by the second digital isolator U12 to the microcontroller U2 is RXD1, and the signal it receives from the signal forwarding circuit is RSD. Isolation between input and output is achieved through the first digital isolator U9 and the second digital isolator U12. Moreover, the first isolation circuit and the second isolation circuit have a signal amplification function, which can effectively increase the number of devices connected to the communication circuit and can extend the signal transmission distance, further improving the performance and stability of the system. Also, these two circuits can isolate the input signal and the output signal, avoiding direct connection between the signals.
[0044] Optionally, the signal forwarding circuit can be a DM512 circuit, and balanced communication between RS-485 and RS-422 is achieved through this circuit. This signal forwarding circuit converts the TTL level output from the microcontroller U2 into a 485 signal level. Among them, the signal forwarding circuit includes a repeater U10 and a fiftieth resistor R50. The voltage terminal of the repeater U10 is connected to the first end of the twenty-second capacitor C22. The signal receiving end of the repeater U10 is connected to the output end of the first isolation circuit. The signal sending end of the repeater U10 is connected to the input end of the second isolator circuit. The first end of the fiftieth resistor R50 is connected to the first differential signal end of the repeater U10, and the second end of the fiftieth resistor R50 is connected to the second differential signal end of the repeater U10.
[0045] In one embodiment, the repeater U10 can be an RS-485 bus transceiver, and its model can be TP8485E. It receives DMX_CON1 sent by the first isolation circuit through the third pin and the second pin (i.e., the DE pin and the RE pin), receives the TXD1 signal sent by the first isolation circuit through the fourth pin, and sends the RXD signal to the second isolation circuit through the first pin. Moreover, the repeater U10 sends the first differential signal and the second differential signal through the sixth pin and the seventh pin. Specifically, when the microcontroller U2 sends data, the output TXD is at a high level, and DMX_CON is also at a high level. Therefore, TXD1 is at a high level, and DMX_CON1 is also at a high level. The signal DMX_CON1 is transmitted to the transceiver, and the transceiver is used as a transmitter to convert the TTL level into a 485 signal level and output the signal corresponding to the 485 level. When the microcontroller U2 does not send data, the output DMX_CON is at a low level. Therefore, DMX_CON1 is at a low level, and the transceiver is used as a receiver to convert the 485 level into a TTL signal level. The sixth pin and the seventh pin are in a high-impedance state, and the signal is controlled by the other end, and the microcontroller U2 receives the signal. During use, to make the chip more stable, a fiftieth resistor R50 is added before the differential signal for impedance matching to improve the anti-interference ability. The signal forwarding circuit uses an RS-485 bus transceiver, which adopts balanced transmission and differential reception, has high receiving sensitivity and strong anti-interference ability, and the signal transmission distance can reach 1000 meters. This characteristic enables the DMX512 signal to maintain a stable transmission quality in a complex or interference-prone environment.
[0046] Optionally, to achieve isolation between the signal forwarding circuit and the controlled device, the communication circuit further includes a signal protection circuit, and the signal protection circuit is connected to the first isolation circuit and the second isolation circuit through the signal forwarding circuit.
[0047] Optionally, the signal protection circuit includes a first fuse F1 and a second fuse F2. The first end of the first fuse F1 is connected to the first differential signal terminal, and the second end of the second fuse F2 is connected to the second differential signal terminal.
[0048] In one embodiment, the first fuse F1 and the second fuse F2 are self-resetting fuses. When an overcurrent or short-circuit fault occurs in the circuit, the current is quickly cut off through the self-resetting fuse to prevent the large current from damaging the circuit or device. Moreover, after the fault is eliminated, the self-resetting fuse can automatically return to its original state and re-close the circuit. This improves the safety and reliability of the circuit, and at the same time reduces the maintenance cost and maintenance time.
[0049] Optionally, the signal protection circuit further includes a first transient suppression diode Z1, a second transient suppression diode Z2, a forty-first resistor R41, and a fifty-second resistor R52. The anode of the second transient suppression diode Z2 is connected to the first differential signal terminal and the first end of the forty-first resistor R41. The cathode of the second transient suppression diode Z2 is connected to the cathode of the first transient suppression diode Z1 and grounded. The anode of the first transient suppression diode Z1 is connected to the second end of the fiftieth resistor R50 and the first end of the fifty-second resistor R52. The second end of the fifty-second resistor R52 is grounded.
[0050] In one embodiment, the signal protection circuit further includes a fifty-sixth resistor R56. The first end of the fifty-sixth resistor R56 is grounded, and the second end is connected to the second end of the fifty-second resistor R52. Among them, electrostatic protection and surge protection are achieved through the first transient suppression diode Z1 and the second transient suppression diode Z2. The transient suppression diode is used to suppress the external voltage from being too high instantaneously. When a surge pulse voltage appears instantaneously in the protected circuit, the transient suppression diode can quickly break down in a Zener manner, changing from a high-resistance state to a low-resistance state, shunting and clamping the surge voltage, so as to protect each component in the circuit from being damaged by the instantaneous surge pulse voltage. And the purpose of setting the forty-first resistor R41 and the fifty-second resistor R52 is to ensure that there is a fixed differential voltage in the idle or open state of the circuit, thereby avoiding communication errors or failures caused by uncertain states.
[0051] In the communication circuit of the embodiment of the present application, the control circuit is respectively connected to the signal forwarding circuit through a first isolation circuit and a second isolation circuit. The signal forwarding circuit includes a DMX512 circuit. The first isolation circuit is used to send a first isolation signal to the signal forwarding circuit, and the first isolation signal is generated based on the signal sent by the control circuit. The second isolation circuit is used to send a second isolation signal to the control circuit, and the second isolation signal is generated based on the signal sent by the signal forwarding circuit. The embodiment of the present application can realize the isolation of the input signal and the output signal between the control circuit and the signal forwarding circuit, avoid interference between signals, effectively increase the number of access devices, and can improve the safety and reliability of the circuit and reduce the maintenance cost of the circuit.
[0052] According to one aspect of the embodiment of the present application, there is also provided a lighting control system, as Figure 5 shown. The lighting control system includes the communication circuit as described in the above embodiment, and the communication circuit can be communicatively connected to one or more LED lights or other lighting fixtures.
[0053] The terms "first", "second", "third", "fourth", "1", "2", etc. (if any) in the description, claims and above-mentioned drawings of this application are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described herein can be implemented in an order other than that shown in the drawings or described in words.
[0054] It should be understood that although the flowcharts of the embodiments of this application indicate each operation step by arrows, the execution order of these steps is not limited to the order indicated by the arrows. Unless otherwise clearly stated in this article, in some implementation scenarios of the embodiments of this application, the implementation steps in each flowchart can be executed in other orders according to requirements. In addition, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages based on the actual implementation scenario. Some or all of these sub-steps or stages can be executed at the same time, and each sub-step or stage among these sub-steps or stages can also be executed at different times respectively. In the scenario where the execution times are different, the execution order of these sub-steps or stages can be flexibly configured according to requirements, and the embodiments of this application do not limit this.
[0055] The above are only optional implementation manners of some implementation scenarios of this application. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the technical concept of the solution of this application, using other similar implementation means based on the technical idea of this application also belongs to the protection scope of the embodiments of this application.
Claims
1. A communication circuit, characterized in that, It includes a control circuit, a first isolation circuit, a second isolation circuit, and a signal forwarding circuit. The control circuit is respectively connected to the signal forwarding circuit through the first isolation circuit and the second isolation circuit. The signal forwarding circuit includes a DMX512 circuit; The first isolation circuit is used to send a first isolation signal to the signal forwarding circuit, and the first isolation signal is generated based on the signal sent by the control circuit; The second isolation circuit is used to send a second isolation signal to the control circuit, and the second isolation signal is generated based on the signal sent by the signal forwarding circuit.
2. The communication circuit according to claim 1, wherein It further includes a third isolation circuit. The third isolation circuit is respectively connected to the signal forwarding circuit and the control circuit, and the third isolation circuit is used to realize isolated power supply from the control circuit to the signal sending circuit.
3. The communication circuit according to claim 2, wherein The third isolation circuit is respectively connected to the output end of the first isolation circuit and the input end of the second isolation circuit; The third isolation circuit includes an isolation power supply, a twenty-first capacitor, a second capacitor, a twenty-second capacitor, and a third capacitor. The first end of the twenty-first capacitor is connected to the power supply end of the control circuit, the first end of the second capacitor, and the first input end of the isolation power supply. The second end of the twenty-first capacitor is connected to the ground end of the control circuit, the second end of the second capacitor, and the second input end of the isolation power supply. The first output end of the isolation power supply is connected to the first end of the twenty-second capacitor, the first end of the third capacitor, and the first input end of the signal forwarding circuit. The second end of the twenty-second capacitor is grounded and is connected to the second output end of the isolation power supply, the second output end of the third capacitor, and the second output end of the signal forwarding circuit.
4. The communication circuit according to claim 3, wherein The first isolation circuit includes a first digital isolator, a forty-third resistor, a forty-eighth resistor, a fifty-fourth resistor, a thirty-ninth resistor, a forty-sixth resistor, and a fifty-third resistor. The first voltage terminal of the first digital isolator is connected to the power supply terminal of the control circuit. The first ground terminal of the first digital isolator is grounded. The first signal input terminal of the first digital isolator is connected to the control circuit through the forty-third resistor. The second signal output terminal is connected to the second end of the forty-eighth resistor and the first end of the fifty-fourth resistor. The second end of the fifty-fourth resistor is grounded. The first end of the forty-eighth resistor is connected to the control circuit. The second voltage terminal of the first digital isolator, the first end of the thirty-ninth resistor, and the first end of the forty-sixth resistor are connected to the first end of the twenty-second capacitor. The second end of the thirty-ninth resistor is connected to the signal forwarding circuit and the first signal output terminal of the first digital isolator. The second end of the forty-sixth resistor is connected to the second end of the fifty-third resistor and the signal forwarding circuit. The first end of the fifty-third resistor is connected to the second signal output terminal of the first digital isolator. The second ground terminal of the first digital isolator is grounded.
5. The communication circuit according to claim 3, wherein The second isolation circuit includes a sixty-fourth resistor, a sixty-sixth resistor, a second digital isolator, a sixty-third resistor, and a sixty-fifth resistor. The second signal input terminal of the second digital isolator is connected to the second ends of the sixty-fourth resistor and the sixty-sixth resistor. The first end of the sixty-fourth resistor is connected to the control circuit. The first end of the sixty-sixth resistor is grounded. The second signal output terminal of the second digital isolator is connected to the first ends of the sixty-fifth resistor and the sixty-third resistor. The second end of the sixty-third resistor is connected to the signal forwarding circuit. The second end of the sixty-fifth resistor is connected to the first end of the twenty-second capacitor.
6. The communication circuit according to claim 3, wherein The signal forwarding circuit includes a repeater and a fiftieth resistor. The voltage terminal of the repeater is connected to the first end of the twenty-second capacitor. The signal receiving terminal of the repeater is connected to the output terminal of the first isolation circuit. The signal sending terminal of the repeater is connected to the input terminal of the second isolation circuit. The first end of the fiftieth resistor is connected to the first differential signal terminal of the repeater. The second end of the fiftieth resistor is connected to the second differential signal terminal of the repeater.
7. The communication circuit according to claim 6, wherein It further includes a signal protection circuit, and the signal protection circuit is connected to the first isolation circuit and the second isolation circuit through the signal forwarding circuit.
8. The communication circuit according to claim 7, wherein The signal protection circuit includes a first fuse and a second fuse. The first end of the first fuse is connected to the first differential signal terminal. The second end of the second fuse is connected to the second differential signal terminal.
9. The communication circuit according to claim 8, wherein, The signal protection circuit further includes a first transient suppression diode, a second transient suppression diode, a forty-first resistor, and a fifty-second resistor. The anode of the second transient suppression diode is connected to the first differential signal terminal and the first end of the forty-first resistor. The cathode of the second transient suppression diode is connected to the cathode of the first transient suppression diode and grounded. The anode of the first transient suppression diode is connected to the second end of the fiftieth resistor and the first end of the fifty-second resistor. The second end of the fifty-second resistor is grounded.
10. A lighting control system, characterized in that, The lighting control system includes the communication circuit according to any one of claims 1-9.