A dimming device based on direct current power line signal transmission

Abstract

The utility model belongs to the technical field of light source light modulation equipment, disclose a kind of light modulation device based on direct current power line signal transmission, including light modulation signal sending equipment and at least one light modulation signal receiving equipment.The utility model is loaded to direct current power line by the signal acquisition module, main control unit and signal modulation emitting module of light modulation signal sending equipment with analog light modulation signal modulation electric signal, light modulation signal receiving equipment obtains modulation electric signal from direct current power line and demodulation output, to realize the digital signal transmission based on direct current power line, without additional wiring, reduce the realization cost, enhance the anti-interference ability, realize reliable long-distance transmission, simultaneously, the signal input end of light modulation signal sending equipment and the signal output end of light modulation signal receiving equipment are compatible with original analog voltage light modulation signal, reduce use cost.

Description

Technical Field

[0001] This utility model belongs to the technical field of light source dimming equipment, specifically relating to a dimming device based on DC power line signal transmission. Background Technology

[0002] In dimming systems for industrial lighting, stage lighting, and other fields, 0-10V analog voltage signals are a widely used standard dimming interface. This dimming method uses a controller to output a 0-10V DC voltage, and the dimming driver linearly adjusts the output brightness according to the magnitude of this voltage, thereby achieving brightness adjustment of the light source.

[0003] However, in practical applications, 0-10V analog voltage signals have certain shortcomings. During long-distance transmission of analog voltage signals, noise is easily introduced into the lines, leading to jitter or inaccuracy in the dimming signal, resulting in poor anti-interference capability. Simultaneously, voltage drop occurs during long-distance transmission of analog voltage signals, causing inconsistencies between the analog voltage signal output by the controller and the voltage signal received by the dimming driver, resulting in decreased dimming accuracy and limiting the transmission distance of the analog voltage signal. Furthermore, this dimming method requires independent analog signal lines at each dimming node, leading to high cabling costs and complex wiring in large-scale systems.

[0004] Some existing technologies use DC power line carrier communication (PLC) technology to solve the problem of analog voltage signal dimming. However, existing PLC solutions are mostly used in AC power grids and are highly complex, lacking a simple and efficient method for light source dimming. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects of existing analog voltage signal dimming, such as poor anti-interference ability, limited transmission distance and complicated wiring, so as to provide a dimming device based on DC power line signal transmission.

[0006] A dimming device based on DC power line signal transmission includes a dimming signal transmitting device and at least one dimming signal receiving device; The dimming signal transmitting device includes: The main control unit is used to convert analog dimming signals into digital dimming signals; A signal acquisition module, connected to the main control module, is used to acquire analog dimming signals and input the analog dimming signals into the main control unit; A signal modulation and transmission module, connected to the main control module, is used to acquire digital dimming signals, modulate the digital dimming signals to form modulated electrical signals, and load the modulated electrical signals onto a DC power line; The power conversion isolation module is connected to the DC power line and obtains power to provide operating power for the dimming signal transmitting device. The dimming signal receiving device is connected to the DC power line and the light source respectively, and is used to obtain the modulated electrical signal from the DC power line, demodulate it to obtain a dimming command and output it to the light source.

[0007] Furthermore, the main control unit includes an integrated analog-to-digital converter, which is used to convert analog dimming signals into digital values, and the main control unit is used to convert the digital values ​​into digital dimming signals.

[0008] Furthermore, the signal acquisition module includes a connected voltage divider resistor network and a filter capacitor bank. The voltage divider resistor network is used to adjust the voltage of the analog dimming signal, and the filter capacitor bank is used to filter the dimming signal.

[0009] Furthermore, the signal modulation and transmission module includes an optocoupler isolation unit, a half-bridge driver, and a switching circuit connected in sequence. The half-bridge driver is used to control the switching circuit to switch according to the digital dimming signal, and to load the modulated electrical signal onto the DC power line.

[0010] Furthermore, the power conversion isolation module includes an isolation power chip and a low-dropout linear regulator connected in sequence. The isolation power chip is used to process the power supply of the power line and to supply power to the dimming signal transmitting device through the low-dropout linear regulator.

[0011] Furthermore, the main control unit also includes a crystal oscillator circuit, which is connected to the MCU of the main control unit to provide the operating clock for the MCU.

[0012] Furthermore, the main control unit also includes a power filtering circuit, which includes multiple filter capacitors and filter inductors and is connected to the power input terminal of the MCU of the main control unit.

[0013] Furthermore, the main control unit and the signal modulation and transmission module are connected via USART communication.

[0014] Beneficial Effects: This utility model discloses a dimming device based on DC power line signal transmission, including a dimming signal transmitting device and at least one dimming signal receiving device. The dimming signal transmitting device includes a main control unit, a signal acquisition module, and a signal modulation and transmission module. The signal acquisition module acquires an analog dimming signal, the main control unit converts the analog dimming signal into a digital dimming signal, the signal modulation and transmission module modulates the digital dimming signal to form a modulated electrical signal and loads it onto the DC power line, and then the dimming signal receiving device acquires the modulated electrical signal from the DC power line, demodulates it to obtain a dimming command, and outputs it to the light source, thereby realizing the dimming of the light source. This invention uses a signal acquisition module, a main control unit, and a signal modulation and transmission module of a dimming signal transmitting device to modulate an analog dimming signal onto a DC power line. The dimming signal receiving device then acquires the modulated signal from the DC power line and demodulates and outputs it, thereby realizing digital signal transmission based on the DC power line. This eliminates the need for additional wiring, reduces implementation costs, enhances anti-interference capabilities, and enables reliable long-distance transmission. Furthermore, the signal input and output terminals of the dimming signal transmitting device and the dimming signal receiving device are compatible with existing analog voltage dimming signals, further reducing usage costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic block diagram of the overall structure of this utility model; Figure 2 This is a circuit diagram of the main control unit of the dimming signal transmitting device of this utility model; Figure 3 This is a circuit diagram of the signal acquisition module of the dimming signal transmitting device of this utility model; Figures 4-6 This is a circuit diagram of the signal modulation and transmission module of the dimming signal transmitting device of this utility model; Figure 7 and Figure 8 This is a circuit diagram of the power conversion isolation module of the dimming signal transmitting device of this utility model. Detailed Implementation

[0017] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0018] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0019] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0020] It should be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0021] Reference Figure 1 As shown, this embodiment provides a dimming device based on DC power line signal transmission, including a dimming signal transmitting device and at least one dimming signal receiving device; The dimming signal transmitting device includes: The main control unit is used to convert analog dimming signals into digital dimming signals; Specifically, the main control power supply includes an MCU, and the main control unit also includes an integrated analog-to-digital converter. The analog-to-digital converter is used to convert analog dimming signals into digital values, and the main control unit is used to convert the digital values ​​into digital dimming signals.

[0022] Reference Figure 2As shown, in a preferred embodiment, the MCU is model GD32E103CBT6, which serves as the control core of the system and converts the digital value into a digital dimming signal. The digital dimming signal is a data frame of a specific protocol formed by packaging.

[0023] Specifically, the MCU acquires the scaled analog voltage through its PA6 pin, i.e., the ADC channel. The MCU's internal program periodically performs ADC sampling and maps the obtained 12-bit digital value (0-4095) back to the original 0-10V value using an internal algorithm. The MCU encapsulates information such as the dimming value and local address into a data frame according to a predetermined serial communication protocol and outputs it as serial data through the USART_TX pin. In some other embodiments of this example, the original value of 0-4095 is directly transmitted and parsed by the dimming signal receiving device.

[0024] A signal acquisition module, connected to the main control module, is used to acquire analog dimming signals and input the analog dimming signals into the main control unit; Specifically, the signal acquisition module includes a connected voltage divider resistor network and a filter capacitor bank. The voltage divider resistor network is used to adjust the voltage of the analog dimming signal, and the filter capacitor bank is used to filter the dimming signal. The signal acquisition module proportionally reduces the analog dimming signal to a voltage range acceptable to the analog-to-digital converter pins of the MCU. Preferably, in this embodiment, the analog dimming signal is a 0-10V analog voltage dimming signal.

[0025] Reference Figure 3 As shown, an external 0-10V dimming signal is input through interface J1. A 100K resistor R13 and a 30K resistor R18 divide the external 0-10V dimming signal, thus scaling the voltage down to approximately 2.3V, within the MCU's ADC range of 0-3.3V, while providing ample margin. Simultaneously, a filter capacitor bank, including capacitors C20, C21, and C22, filters the signal, removing high-frequency noise and improving signal acquisition accuracy.

[0026] A signal modulation and transmission module, connected to the main control module, is used to acquire digital dimming signals, modulate the digital dimming signals to form modulated electrical signals, and load the modulated electrical signals onto a DC power line. In this embodiment, the DC power line is a DC 48V DC power line, which serves as the power supply for the dimming signal transmitting device, the dimming signal receiving device, and the light source, and transmits data between the dimming signal transmitting device and the dimming signal receiving device.

[0027] In this embodiment, the signal modulation and transmission module includes an optocoupler isolation unit, a half-bridge driver, and a switching circuit connected in sequence. The half-bridge driver is used to control the switching circuit to switch according to the digital dimming signal, and to load the modulated electrical signal onto the DC power line.

[0028] Specifically, the main control unit and the signal modulation and transmission module are connected via USART communication. The data frames output from the serial port transmit pin of the MCU are optocoupled and then drive the half-bridge driver, which in turn controls the switching of the MOSFETs, converting the digital signal into a modulated waveform that can be transmitted on a DC 48V power line.

[0029] Reference Figures 4-6 As shown, the data frame output from the MCU's serial port transmit pin TX is isolated by optocoupler U6 to form the light control drive signal IN, which includes the light control amount signal. On the other hand, the signal output from the MCU's pins U2-20 is converted into the switch drive signal ON-OFF by optocoupler U7. The isolated signals are sent to the input pins IN and ON-OFF of the half-bridge driver U5. The turn-off pin SD of U5 is connected to the switch drive signal ON-OFF, thus allowing the MCU to forcibly turn off the half-bridge driver and stop transmitting the modulated electrical signal. U5 drives the gates of two MOSFETs Q1 and Q2 according to the light control drive signal IN, rapidly switching the "0" and "1" of the digital signal into current changes on the DC48V bus. The optocoupler isolates the MCU's 3.3V logic level from the driver's 12V level, preventing high-voltage interference from damaging the MCU.

[0030] The power conversion isolation module is connected to the DC power line and obtains power to provide operating power for the dimming signal transmitting device. In this embodiment, the power conversion isolation module includes an isolation power chip and a low-dropout linear regulator connected in sequence. The isolation power chip processes the power supply of the power line and supplies power to the dimming signal transmitting device through the low-dropout linear regulator. The power conversion isolation module converts the input DC48V power line into multiple low-voltage DC power supplies required by the system.

[0031] Specifically, refer to Figure 7 and Figure 8 As shown, the voltage detector U4 RY8610 circuit isolates and converts DC 48V to a safe 12V to power the driver and optocoupler. The isolated DC-DC power module U1 IB1205XT-1WR3 and the low-dropout linear regulator AMS1117 circuit then convert the 12V to 5V to power the MCU and its peripheral circuits.

[0032] The dimming signal receiving device is connected to the DC power line and the light source respectively, and is used to obtain the modulated electrical signal from the DC power line, demodulate it to obtain a dimming command and output it to the light source.

[0033] As a further improvement to this embodiment, the main control unit also includes a crystal oscillator circuit, which is connected to the MCU of the main control unit to provide a working clock for the MCU.

[0034] The main control unit also includes a power filtering circuit, which includes multiple filter capacitors and filter inductors and is connected to the power input terminal of the MCU of the main control unit.

[0035] The dimming device based on DC power line signal transmission provided in this embodiment modulates the analog dimming signal onto the DC power line through the signal acquisition module, main control unit, and signal modulation and transmission module of the dimming signal transmitting device. The dimming signal receiving device obtains the modulated signal from the DC power line and demodulates and outputs it, thereby realizing digital signal transmission based on DC power line. No additional wiring is required, which reduces the implementation cost, enhances the anti-interference capability, and realizes reliable long-distance transmission. At the same time, the signal input end of the dimming signal transmitting device and the signal output end of the dimming signal receiving device are compatible with the original analog voltage dimming signal, which reduces the cost of use.

[0036] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A dimming device based on DC power line signal transmission, characterized in that, Includes a dimming signal transmitting device and at least one dimming signal receiving device; The dimming signal transmitting device includes: The main control unit is used to convert analog dimming signals into digital dimming signals; A signal acquisition module, connected to the main control module, is used to acquire analog dimming signals and input the analog dimming signals into the main control unit; A signal modulation and transmission module, connected to the main control module, is used to acquire digital dimming signals, modulate the digital dimming signals to form modulated electrical signals, and load the modulated electrical signals onto a DC power line; The power conversion isolation module is connected to the DC power line and obtains power to provide operating power for the dimming signal transmitting device. The dimming signal receiving device is connected to the DC power line and the light source respectively, and is used to obtain the modulated electrical signal from the DC power line, demodulate it to obtain a dimming command and output it to the light source.

2. The dimming device based on DC power line signal transmission according to claim 1, characterized in that, The main control unit includes an integrated analog-to-digital converter, which is used to convert analog dimming signals into digital values, and the main control unit is used to convert the digital values ​​into digital dimming signals.

3. The dimming device based on DC power line signal transmission according to claim 1, characterized in that, The signal acquisition module includes a connected voltage divider resistor network and a filter capacitor bank. The voltage divider resistor network is used to adjust the voltage of the analog dimming signal, and the filter capacitor bank is used to filter the dimming signal.

4. A dimming device based on DC power line signal transmission according to claim 1, characterized in that, The signal modulation and transmission module includes an optocoupler isolation unit, a half-bridge driver, and a switching circuit connected in sequence. The half-bridge driver is used to control the switching circuit to switch according to the digital dimming signal, and to load the modulated electrical signal onto the DC power line.

5. A dimming device based on DC power line signal transmission according to claim 1, characterized in that, The power conversion isolation module includes an isolation power chip and a low-dropout linear regulator connected in sequence. The isolation power chip is used to process the power supply of the power line and to supply power to the dimming signal transmitting device through the low-dropout linear regulator.

6. A dimming device based on DC power line signal transmission according to claim 1, characterized in that, The main control unit also includes a crystal oscillator circuit, which is connected to the MCU of the main control unit to provide the operating clock for the MCU.

7. A dimming device based on DC power line signal transmission according to claim 1, characterized in that, The main control unit also includes a power filtering circuit, which includes multiple filter capacitors and filter inductors and is connected to the power input terminal of the MCU of the main control unit.

8. A dimming device based on DC power line signal transmission according to claim 1, characterized in that, The main control unit and the signal modulation and transmission module are connected via USART communication.

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