DALI low-voltage driving circuit

Abstract

According to the DALI low-voltage driving circuit provided by the utility model, an input voltage is converted into a working voltage through the voltage reduction module, a DALI signal sent by an upper computer is received through the DALI receiving and forwarding module, and the DALI signal is forwarded to the main control module; the DALI signal is converted into a PWN signal through a main control module, and the PWN signal is forwarded to the constant current output module; and controlling a load through a constant current output module according to the PWN signal. According to the utility model, a DALI control protocol is adopted, a reasonable output voltage is designed according to the load condition, accurate control of the load voltage is realized, and the safety, reliability and energy efficiency of the system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, in particular to a DALI low-voltage drive circuit. Background Art

[0002] At present, traditional lighting control systems usually use analog signals to control the brightness and color of lights. Although this method can meet the basic requirements in some simple lighting applications, there are many limitations in actual applications, such as: limited control range, complex installation, poor anti-interference ability, single function and high energy consumption.

[0003] In summary, the problems existing in the prior art continue to be solved. Summary of the Utility Model

[0004] The utility model provides a DALI low-voltage drive circuit to solve the defects in the prior art and realize a reasonable output voltage designed according to different loads.

[0005] The utility model provides a DALI low-voltage drive circuit, including: a buck module, a main control module, a DALI receiving and forwarding module, and a plurality of constant current output modules;

[0006] The buck module is used to convert the input voltage into a working voltage, and the working voltage is used to supply power to the main control module and the DALI receiving and forwarding module;

[0007] The DALI receiving and forwarding module is used to receive the DALI signal sent by the host computer and forward the DALI signal to the main control module;

[0008] The main control module is used to convert the DALI signal into a PWN signal and forward the PWN signal to the constant current output module;

[0009] The constant current output module is used to control the load according to the PWN signal.

[0010] According to a DALI low-voltage drive circuit provided by the utility model, the buck module includes a buck chip U6, a filter capacitor C13, a filter capacitor C14, a filter capacitor C17, a filter capacitor C18, a filter inductor L3, and a freewheeling diode D6;

[0011] The first end of the filtering capacitor C13 is connected to the pin 1 of the step-down chip U6, the second end of the filtering capacitor C13 is connected to the pin 8 of the step-down chip U6, the first end of the filtering capacitor C14 is connected to the pin 1 of the step-down chip U6, the second end of the filtering capacitor C14 is grounded, the first end of the filtering capacitor C17 is connected to the pin 5 of the step-down chip U6, the second end of the filtering capacitor C17 is connected to the first end of the filtering capacitor C18, the second end of the filtering capacitor C18 is grounded, the first end of the filtering inductor L3 is connected to the pin 2 of the step-down chip U6, the second end of the filtering inductor L3 is connected to the first end of the filtering capacitor C18, the first end of the freewheeling diode D6 is connected to the pin 2 of the step-down chip U6, and the second end of the freewheeling diode D6 is grounded.

[0012] According to a DALI low-voltage drive circuit provided by the present invention, the step-down chip U6 is XL1509.

[0013] According to a DALI low-voltage drive circuit provided by the present invention, the DALI receiving and forwarding module includes a step-down chip U1, a rectifier bridge D2, an optocoupler U3, and an optocoupler U4;

[0014] The output end of the step-down chip U1 is connected to the input end of the rectifier bridge D2, and the output end of the rectifier bridge D2 is respectively connected to the input ends of the optocoupler U3 and the optocoupler U4.

[0015] According to a DALI low-voltage drive circuit provided by the present invention, the step-down chip U1 is ST-MC34063.

[0016] According to a DALI low-voltage drive circuit provided by the present invention, the main control module includes a single-chip microcomputer and a single-chip microcomputer peripheral circuit, and the single-chip microcomputer peripheral circuit includes a crystal oscillator, filtering capacitors C4, C5, C6, C11, and a pull-up resistor R3.

[0017] According to a DALI low-voltage drive circuit provided by the present invention, the single-chip microcomputer is NUC029LAN.

[0018] According to a DALI low-voltage drive circuit provided by the present invention, the constant current output module includes a constant current chip and a constant current chip peripheral circuit, and the constant current chip peripheral circuit includes filtering capacitors C12, C15, C16, a freewheeling diode D5, a filtering inductor L2, sampling resistors RS1 and RS2.

[0019] According to a DALI low-voltage drive circuit provided by the present invention, the constant current chip is MBI6658.

[0020] A DALI low-voltage drive circuit provided by the present utility model converts the input voltage to the working voltage through a buck module, receives the DALI signal sent by the host computer through a DALI receiving and forwarding module, and forwards the DALI signal to the main control module; converts the DALI signal into a PWN signal through the main control module, and forwards the PWN signal to the constant current output module; controls the load according to the PWN signal through the constant current output module. The present utility model adopts the DALI control protocol, designs a reasonable output voltage according to the load condition, realizes the precise control of the load voltage, and improves the safety, reliability and energy efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a schematic diagram of the modules of the DALI low-voltage drive circuit provided by the present utility model;

[0023] Figure 2 is the specific circuit diagram of the buck module provided by the present utility model;

[0024] Figure 3 is the specific circuit diagram of the DALI receiving and forwarding module provided by the present utility model;

[0025] Figure 4 is the specific circuit diagram of the main control module provided by the present utility model;

[0026] Figure 5 is the specific circuit diagram of the constant current output module provided by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the present utility model in conjunction with the drawings in the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present utility model belong to the scope of protection of the present utility model.

[0028] Currently, traditional lighting control systems usually use analog signals to control the brightness and color of lights. Although this method can meet the basic needs in some simple lighting applications, there are many limitations in practical applications, including the following aspects:

[0029] Limited control range: In the process of adjusting the brightness and color of lights by the analog signal control method, it is limited by the transmission distance of the signal and the attenuation of the signal strength, resulting in a limited control range and making it difficult to achieve precise long-distance control. This is particularly inconvenient for scenarios that require large-scale lighting control, such as large shopping malls, stadiums, and public buildings.

[0030] Complex installation: Analog signal control systems usually require laying a large number of control cables, which not only increases the complexity and cost of installation but also increases the difficulty of maintenance. Once a fault occurs, the time and effort required to find and repair the problem will also increase significantly.

[0031] Poor anti-interference ability: Analog signals are easily affected by electromagnetic interference, especially in industrial environments where there are a large number of electromagnetic interference sources, which will greatly reduce the accuracy and stability of lighting control, resulting in phenomena such as flickering and out-of-control.

[0032] Single function: Traditional analog signal control systems have relatively single functions and are difficult to meet complex control requirements, such as functions required by modern lighting systems like intelligent dimming, color temperature adjustment, and scene switching.

[0033] High energy consumption: Since traditional analog control systems usually adopt a linear adjustment method during dimming, this will lead to energy waste, and the overall energy efficiency of the system is low, which does not meet the requirements of modern energy conservation and environmental protection.

[0034] To solve the problems in the existing technology, the present utility model proposes a DALI low-voltage drive circuit to achieve a reasonable output voltage according to different loads. The following describes the DALI low-voltage drive circuit, as Figure 1 shown, including but not limited to the following modules:

[0035] Step-down module 110, DALI receiving and forwarding module 120, main control module 130, and several constant current output modules 140;

[0036] The step-down module is used to convert the input voltage to the working voltage, and the working voltage is used to supply power to the main control module and the DALI receiving and forwarding module;

[0037] The DALI receiving and forwarding module is used to receive the DALI signal sent by the upper computer and forward the DALI signal to the main control module;

[0038] The main control module is used to convert the DALI signal into a PWM signal and forward the PWM signal to the constant current output module;

[0039] The constant current output module is used to control the load according to the PWM signal.

[0040] As a further optional embodiment, the buck module includes a buck chip U6, filter capacitors C13, C14, C17, C18, a filter inductor L3, and a freewheeling diode D6;

[0041] Reference Figure 2 As shown in the figure, the first end of the filter capacitor C13 is connected to the 1-pin of the buck chip U6, the second end of the filter capacitor C13 is connected to the 8-pin of the buck chip U6, the first end of the filter capacitor C14 is connected to the 1-pin of the buck chip U6, the second end of the filter capacitor C14 is grounded, the first end of the filter capacitor C17 is connected to the 5-pin of the buck chip U6, the second end of the filter capacitor C17 is connected to the first end of the filter capacitor C18, the second end of the filter capacitor C18 is grounded, the first end of the filter inductor L3 is connected to the 2-pin of the buck chip U6, the second end of the filter inductor L3 is connected to the first end of the filter capacitor C18, the first end of the freewheeling diode D6 is connected to the 2-pin of the buck chip U6, and the second end of the freewheeling diode D6 is grounded.

[0042] As a further optional embodiment, the buck chip U6 is XL1509.

[0043] As a further optional embodiment, the DALI receiving and forwarding module includes a buck chip U1, a rectifier bridge D2, optocouplers U3, and U4;

[0044] Reference Figure 3 As shown in the figure, the output end of the buck chip U1 is connected to the input end of the rectifier bridge D2, and the output end of the rectifier bridge D2 is respectively connected to the input ends of the optocouplers U3 and U4.

[0045] As a further optional embodiment, the buck chip U1 is ST-MC34063.

[0046] As a further optional embodiment, reference Figure 4 As shown in the figure, the main control module includes a single-chip microcomputer and a single-chip microcomputer peripheral circuit. The single-chip microcomputer peripheral circuit includes a crystal oscillator, filter capacitors C4, C5, C6, C11, and a pull-up resistor R3.

[0047] As a further optional embodiment, the single-chip microcomputer is NUC029LAN.

[0048] As a further optional embodiment, referring to Figure 5 , the constant current output module includes a constant current chip and a peripheral circuit of the constant current chip. The peripheral circuit of the constant current chip includes a filter capacitor C12, a filter capacitor C15, a filter capacitor C16, a freewheeling diode D5, a filter inductor L2, a sampling resistor RS1, and a sampling resistor RS2.

[0049] As a further optional embodiment, the constant current chip is MBI6658.

[0050] Based on the above embodiments, the principle of the present utility model will be described as follows:

[0051] The DC-DC buck module is mainly used to step down the external voltage (24~36VDC) to 5V, providing the main power supply for the main control module and the DALI module. This module consists of a buck chip U6 (XL1509) and its peripheral circuit, specifically including:

[0052] Input filter capacitors C14, C13, which are used to filter out high-frequency noise in the input voltage.

[0053] Freewheeling diode D6, which is used to provide a current path during the buck process.

[0054] Filter inductor L3, which is used to smooth the output current and reduce current ripple.

[0055] Output filter capacitors C18, C17, which are used to filter out the ripple in the output voltage and ensure a stable 5V output.

[0056] The working principle is that after the external voltage is stepped down by the U6 (XL1509) buck chip, it is filtered by C14, C13, and then processed by D6, L3, and C18, C17, and finally a stable 5V voltage is output to supply power to the subsequent main control module and DALI module.

[0057] The DALI receiving and forwarding module is used to receive the DALI signal sent by the host computer and convert it into an electrical signal required by the single-chip microcomputer. This module consists of the following parts:

[0058] Buck chip U1 (ST-MC34063), which is used for buck processing.

[0059] Rectifier bridge D2 (MB10F), which rectifies the DALI signal.

[0060] Opto-couplers U3, U4 (TLP521SM), which utilize the characteristic of opto-isolation to achieve isolation between strong and weak electricity.

[0061] Current-limiting resistors R1, R2, and R6 are used to limit the current and protect the circuit.

[0062] Input filter capacitor C1 is used to filter out the high-frequency noise of the input signal.

[0063] Output voltage regulating resistors R4 and R5 are used to adjust the output voltage of U1. The formula is: Vout = 1.23 * (1 + R4 / R5). By selecting different resistance values of R4 and R5, the required output voltage can be obtained.

[0064] Filter capacitors C2, C3, C7, C9, and C10 are used to filter out the ripple in the output signal.

[0065] Zener diode D4 is used to stabilize the output voltage.

[0066] Freewheeling diode D1 is used to provide a current path.

[0067] The DALI module operates in a 16VDC working environment. The DALI signal sent by the host computer is processed by the D2 rectifier bridge and the optocoupler, and finally converted into the electrical signal required by the single-chip microcomputer.

[0068] The main control module consists of a single-chip microcomputer U2 (NUC029LAN) and its peripheral circuits, and is used to receive and process the DALI signal and output a PWM signal to control the constant current module. Specifically, it includes:

[0069] Crystal oscillator X1 (12M) provides a clock signal for the single-chip microcomputer.

[0070] Filter capacitors C6 and C11 are used to stabilize the power supply.

[0071] Program burning port J1 is used for burning the program of the single-chip microcomputer.

[0072] Pull-up resistor R3 is used to provide a stable high level.

[0073] Filter capacitors C4 and C5 are used to filter out the power supply noise.

[0074] After being processed by the DALI receiving and forwarding module, the external DALI signal enters the single-chip microcomputer U2 through pin 38 and pin 37. After being processed by the internal algorithm of the single-chip microcomputer, the PWM signal is output through pin 20, pin 21, and pin 22 to control the constant current output module.

[0075] The constant current output module consists of a constant current chip U5 (MBI6658) and its peripheral circuits, and is used to control the load according to the PWM signal and adjust the brightness. Specifically, it includes:

[0076] Input filter capacitors C15 and C16 are used to filter out the high-frequency noise in the input voltage.

[0077] A freewheeling diode D5 is used to provide a current path.

[0078] A filter inductor L2 is used to smooth the output current and reduce current ripple.

[0079] An output filter capacitor C12 is used to filter out the ripple in the output voltage.

[0080] Sampling resistors RS1 and RS2 are used to detect the output current. The formula is: I = R / 0.1. By adjusting the resistance value of this resistor, the load output current is controlled.

[0081] The working principle is that the constant current output module adjusts the output current according to the PWM signal sent by the single-chip microcomputer U2, controls the brightness of the load, and realizes the precise control of the light.

[0082] Through the coordinated work of the above-mentioned modules, the DALI low-voltage drive circuit of the present utility model can achieve efficient and precise control of the light, and is applicable to various complex lighting application scenarios.

[0083] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course also by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disc, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A DALI low-voltage drive circuit, characterized in that Including: A step-down module, a main control module, a DALI receiving and forwarding module, and several constant current output modules; The step-down module is used to convert the input voltage to the working voltage, and the working voltage is used to supply power to the main control module and the DALI receiving and forwarding module; The DALI receiving and forwarding module is used to receive the DALI signal sent by the host computer and forward the DALI signal to the main control module; The main control module is used to convert the DALI signal into a PWN signal and forward the PWN signal to the constant current output module; The constant current output module is used to control the load according to the PWN signal.

2. The DALI low-voltage drive circuit according to claim 1, wherein The step-down module includes a step-down chip U6, a filter capacitor C13, a filter capacitor C14, a filter capacitor C17, a filter capacitor C18, a filter inductor L3, and a freewheeling diode D6; The first end of the filter capacitor C13 is connected to the 1 pin of the step-down chip U6, the second end of the filter capacitor C13 is connected to the 8 pin of the step-down chip U6, the first end of the filter capacitor C14 is connected to the 1 pin of the step-down chip U6, the second end of the filter capacitor C14 is grounded, the first end of the filter capacitor C17 is connected to the 5 pin of the step-down chip U6, the second end of the filter capacitor C17 is connected to the first end of the filter capacitor C18, the second end of the filter capacitor C18 is grounded, the first end of the filter inductor L3 is connected to the 2 pin of the step-down chip U6, the second end of the filter inductor L3 is connected to the first end of the filter capacitor C18, the first end of the freewheeling diode D6 is connected to the 2 pin of the step-down chip U6, and the second end of the freewheeling diode D6 is grounded.

3. The DALI low-voltage drive circuit according to claim 2, characterized in that, The step-down chip U6 is XL1509.

4. The DALI low-voltage drive circuit according to claim 1, characterized in that, The DALI receiving and forwarding module includes a step-down chip U1, a rectifier bridge D2, an optocoupler U3, and an optocoupler U4; The output end of the step-down chip U1 is connected to the input end of the rectifier bridge D2, and the output end of the rectifier bridge D2 is respectively connected to the input ends of the optocoupler U3 and the optocoupler U4.

5. The DALI low-voltage drive circuit according to claim 4, characterized in that, The step-down chip U1 is ST-MC34063.

6. The DALI low-voltage driving circuit according to claim 1, wherein The main control module includes a single-chip microcomputer and a single-chip microcomputer peripheral circuit. The single-chip microcomputer peripheral circuit includes a crystal oscillator, a filter capacitor C4, a filter capacitor C5, a filter capacitor C6, a filter capacitor C11, and a pull-up resistor R3.

7. The DALI low-voltage drive circuit according to claim 6, characterized in that, The single-chip microcomputer is NUC029LAN.

8. The DALI low-voltage driving circuit according to claim 1, wherein The constant current output module includes a constant current chip and a constant current chip peripheral circuit. The constant current chip peripheral circuit includes a filter capacitor C12, a filter capacitor C15, a filter capacitor C16, a freewheeling diode D5, a filter inductor L2, a sampling resistor RS1, and a sampling resistor RS2.

9. The DALI low-voltage driving circuit according to claim 8, wherein, The constant current chip is MBI6658.

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