A signal conversion circuit for a point light source

Abstract

This utility model relates to the field of lighting control technology, specifically a signal conversion circuit for point light sources. It includes a main controller, which is connected to a signal converter via a short-circuit protection circuit, a reverse connection protection circuit, a lightning strike protection circuit, and a hot-swap protection circuit. The digital output and input terminals of the signal converter are both connected to an SPI signal driver via the hot-swap protection circuit. The driving terminal of the SPI signal driver is connected to an LED group. The analog output and bus output terminals of the signal converter are also connected to an RS signal output terminal. This signal conversion circuit for point light sources, through the coordinated arrangement of the signal converter, SPI signal driver, and RS485 signal output terminal, can convert SPI to RS485 signals and RS485 to SPI signals, integrating them into the point light source to drive the LEDs. It achieves a control signal transmission distance of 200 meters between points without requiring address writing, facilitating installation and debugging, and enabling long-distance control.

Description

Technical Field

[0001] This utility model relates to the field of lighting control technology, specifically to a signal conversion circuit for a point light source. Background Technology

[0002] LED beads are light-emitting diodes based on semiconductor materials that convert electrical energy into light energy. They have advantages such as high brightness, low power consumption, long lifespan, and fast response, and are widely used in lighting, display, communication, and decoration. When using LED beads, multiple LED beads can be controlled through an SPI interface. SPI-controlled light sources are widely used in full-color modules and soft light strips for indoor and outdoor decorative lighting, in irregularly shaped displays, and in LED displays for high-resolution image display, among other applications.

[0003] However, the transmission distance of the SPI control signal is only 10 meters between points, which is relatively short. On the other hand, the transmission distance of the DMX512 signal control can reach 200 meters between points, but each light source needs to be written with an address code, which increases the complexity of control and cannot meet the current needs of point light source control. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a signal conversion circuit for point light sources, solving the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a signal conversion circuit for a point light source, comprising a main controller, wherein the main controller is connected to a signal converter in sequence via a short-circuit protection circuit, a reverse connection protection circuit, a lightning strike protection circuit, and a hot-swap protection circuit; the digital output terminal and input terminal of the signal converter are both connected to an SPI signal driver via the hot-swap protection circuit; the driving terminal of the SPI signal driver is connected to an LED group; and the analog output terminal and bus output terminal of the signal converter are also connected to an RS signal output terminal in sequence via the short-circuit protection circuit, the reverse connection protection circuit, the lightning strike protection circuit, and the hot-swap protection circuit.

[0006] Optionally, the short-circuit protection circuit includes resettable fuses F1, F2, F3, and F4. When a short circuit occurs, the current will exceed the fuse's 200mA threshold, causing the fuse to trip and the circuit to stop working, thus protecting the circuit and components from damage. Once the fault is cleared, the fuse automatically resets and the circuit resumes normal operation.

[0007] Optionally, the reverse connection protection circuit includes current-limiting resistors R4, R5, R8, and R9. When the wiring is incorrect, the current through the current-limiting resistors R4, R5, R8, and R9 will exceed the 200mA threshold of the fuse, causing the short-circuit protection circuit to disconnect and stop working. Adjusting the current-limiting resistors R4, R5, R8, and R9 will then prevent the circuit from working.

[0008] Optionally, the lightning protection circuit includes bidirectional TVS diodes T2, T3, T4, and T5, which can quickly absorb instantaneous large currents by connecting to GND ground, thereby quickly absorbing the large currents generated during lightning strikes or hot-plugging, and protecting the normal operation of circuit components.

[0009] Optionally, the lightning protection circuit further includes resistors R6, R7, R10, and R11 to enhance the absorption capacity of the bidirectional TVS diodes T2, T4, T5, and T7.

[0010] Optionally, filter capacitors C8 and C9 are also included to increase circuit stability.

[0011] Optionally, the hot-plugging protection circuit includes a current-limiting resistor R12 and a current-limiting resistor R13. The resistance values ​​of the current-limiting resistors R12 and R13 are used to change the current-limiting magnitude, which works in conjunction with the short-circuit protection circuit to protect the circuit and components from damage. When the fault is cleared, the short-circuit protection circuit automatically restores the circuit to normal operation.

[0012] Optionally, the LED light group includes a first LED, a second LED, and a third LED, which are connected in series and are also connected to a voltage divider resistor R1.

[0013] This utility model provides a signal conversion circuit for a point light source, which has the following advantages:

[0014] This signal conversion circuit for point light sources, through the coordinated setup of a signal converter, SPI signal driver, and RS485 signal output terminal, can convert SPI to RS485 signals and RS485 to SPI signals, integrating them into the point light source to drive LEDs. It enables point-to-point control signal transmission over a distance of 200 meters without requiring address writing, facilitating installation and debugging, and providing remote control while effectively reducing control complexity. Short-circuit protection circuits prevent damage during installation and wiring, reverse connection protection circuits prevent damage from incorrect wiring, and lightning strike protection and hot-plug protection circuits quickly absorb large currents generated during lightning strikes or hot-plugging, protecting circuit components and ensuring normal operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the framework of this utility model;

[0016] Figure 2 This is a schematic diagram of the live plugging and unplugging protection circuit of this utility model;

[0017] Figure 3 This is a schematic diagram showing the connection of the short-circuit protection circuit, the reverse connection protection circuit, and the lightning protection circuit of this utility model;

[0018] Figure 4 This is a schematic diagram of the LED lamp assembly circuit connection of this utility model.

[0019] In the diagram: 1. Main controller; 2. Short circuit protection circuit; 3. Reverse connection protection circuit; 4. Lightning protection circuit; 5. Hot-swap protection circuit; 6. Signal converter; 7. RS485 signal output terminal; 8. SPI signal driver; 9. LED light group. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Please see Figure 1This utility model provides a technical solution: a signal conversion circuit for a point light source, including a main controller 1. The main controller 1 is connected to a signal converter 6 in sequence through a short-circuit protection circuit 2, a reverse connection protection circuit 3, a lightning protection circuit 4, and a hot-swap protection circuit 5. The digital output and input terminals of the signal converter 6 are both connected to an SPI signal driver 8 through the hot-swap protection circuit 5. The analog output and bus output terminals of the signal converter 6 are also connected to an RS485 signal output terminal 7 in sequence through the short-circuit protection circuit 2, the reverse connection protection circuit 3, the lightning protection circuit 4, and the hot-swap protection circuit 5. By coordinating the signal converter 6, the SPI signal driver 8, and the RS485 signal output terminal 7, SPI signals can be converted to RS485 signals, and RS485 signals can be converted to SPI signals. These can be integrated into the point light source to drive the LED. This achieves a control signal transmission distance of 200 meters between points without the need to write addresses, making installation and debugging convenient and enabling long-distance control, while effectively reducing the complexity of control.

[0022] Please see Figure 2 and Figure 3 The short-circuit protection circuit 2 includes resettable fuses F1, F2, F3, and F4. When a short circuit occurs, the current will exceed the fuse's 200mA threshold, causing the fuse to trip and stop the circuit from working, thus protecting the circuit and components from damage. Once the fault is cleared, the fuse automatically resets the circuit to normal operation.

[0023] The reverse connection protection circuit 3 includes current-limiting resistors R4, R5, R8, and R9. When the wiring is incorrect, the current through current-limiting resistors R4, R5, R8, and R9 will exceed the 200mA threshold of the fuse. The short-circuit protection circuit 2 will then disconnect and stop working. Adjust the current-limiting resistors R4, R5, R8, and R9.

[0024] The lightning protection circuit 4 includes bidirectional TVS diodes T2, T3, T4, and T5. By connecting to GND ground, it can quickly absorb instantaneous large currents to rapidly absorb the large currents generated during lightning strikes or hot-plugging, protecting the normal operation of circuit components. The lightning protection circuit 4 also includes resistors R6, R7, R10, and R11 to enhance the absorption capacity of bidirectional TVS diodes T2, T4, T5, and T7.

[0025] The hot-plugging protection circuit 5 includes current-limiting resistors R12 and R13. The resistance values ​​of R12 and R13 are used to adjust the current limiting value, working in conjunction with the short-circuit protection circuit 2 to protect the circuit and components from damage. After the fault is cleared, the short-circuit protection circuit 2 automatically restores normal circuit operation. It also includes filter capacitors C8 and C9 to increase circuit stability. Figure 3 As shown, the UCS2904 LED constant current driver IC is used, and its constant current outputs R1, G1, B1 and W1 drive the brightness of the LED group.

[0026] Please see Figure 4 The driving end of the SPI signal driver 8 is connected to an LED group 9, which includes a first LED, a second LED, and a third LED. The first LED, the second LED, and the third LED are connected in series. The first LED, the second LED, and the third LED can be selected using a 5050RGBW 4-in-1 color quantity package, and a voltage divider resistor R1 is also connected to divide the voltage of the red LED.

[0027] In this invention, the working steps of the device are as follows:

[0028] The signal converter 6 receives the RS485 signal from the main controller 1 through the short circuit protection circuit 2, the reverse connection protection circuit 3, the lightning protection circuit 4, and the hot-plug protection circuit 5 in sequence. It converts the signal into an SPI signal and sends it to the SPI signal driver 8, which then drives the LED light group 9 to illuminate.

[0029] Meanwhile, the signal converter 6 receives the SPI signal returned from the SPI signal driver 8, converts it into an RS485 signal, and then transmits it from the RS485 signal output terminal 7 to the next point light source through the short circuit protection circuit 2, the reverse connection protection circuit 3, the lightning protection circuit 4, and the hot-plug protection circuit 5 in sequence.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A signal conversion circuit for a point light source, comprising a master controller (1), characterized in that: The main controller (1) is connected to a signal converter (6) in sequence through a short-circuit protection circuit (2), a reverse connection protection circuit (3), a lightning protection circuit (4), and a hot-swap protection circuit (5). The digital output and input terminals of the signal converter (6) are connected to an SPI signal driver (8) through the hot-swap protection circuit (5). The driving terminal of the SPI signal driver (8) is connected to an LED light group (9). The analog output and bus output terminals of the signal converter (6) are also connected to an RS485 signal output terminal (7) in sequence through the short-circuit protection circuit (2), the reverse connection protection circuit (3), the lightning protection circuit (4), and the hot-swap protection circuit (5).

2. The signal conversion circuit for a point light source according to claim 1, characterized in that: The short-circuit protection circuit (2) includes resettable fuses F1, F2, F3 and F4. When the wiring is short-circuited, the current will exceed the fuse's 200mA threshold. The fuse will disconnect and the circuit will stop working, and the protection circuit and components will not be damaged. When the fault is cleared, the fuse will automatically restore the circuit to normal operation.

3. The signal conversion circuit for a point light source according to claim 1, characterized in that: The reverse connection protection circuit (3) includes current limiting resistors R4, R5, R8 and R9. When the wiring is incorrect, the current through the current limiting resistors R4, R5, R8 and R9 will exceed the 200mA threshold of the fuse. The short circuit protection circuit (2) corresponding to this circuit will disconnect and stop working. Adjust the current limiting resistors R4, R5, R8 and R9.

4. The signal conversion circuit for a point light source according to claim 1, characterized in that: The lightning protection circuit (4) includes bidirectional TVS diodes T2, T3, T4, and T5. By connecting to GND ground, it can quickly absorb instantaneous large currents to quickly absorb the large currents generated during lightning strikes or hot-plugging, thus protecting the normal operation of circuit components.

5. A signal conversion circuit for a point light source according to claim 4, characterized in that: The lightning protection circuit (4) also includes resistors R6, R7, R10 and R11, which are used to enhance the absorption and modification capabilities of the bidirectional TVS transistors T2, T4, T5 and T7.

6. The signal conversion circuit for a point light source according to claim 1, characterized in that: It also includes filter capacitors C8 and C9, which are used to increase circuit stability.

7. The signal conversion circuit for a point light source according to claim 1, characterized in that: The hot-plugging protection circuit (5) includes a current-limiting resistor R12 and a current-limiting resistor R13. The current-limiting value is changed by the resistance values ​​of the current-limiting resistors R12 and R13 to cooperate with the short-circuit protection circuit (2) to protect the circuit and components from damage. When the fault is cleared, the short-circuit protection circuit (2) automatically restores the circuit to normal operation.

8. A signal conversion circuit for a point light source according to claim 1, characterized in that: The LED light group (9) includes a first LED, a second LED and a third LED, which are connected in series and are also connected to a voltage divider resistor R1.

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