Dimming information remote transmission device

Abstract

The application provides a dimming information remote transmission device, and relates to the technical field of variable lane signboards. The application is provided with a collection dimming module, and a light intensity sensor for sampling the light intensity of stable light in a road environment is connected to the collection dimming module. The collection dimming module comprises a controller U2, a PWM signal generated according to light data collected by the light intensity sensor, a strong electric alternating current signal representing dimming information generated by a PWM alternating voltage regulating circuit driven by the PWM signal, and a plurality of dimming adapter boards connected remotely by the collection dimming module. Each dimming adapter board comprises a controller U8, a signal collection circuit, an amplification filter circuit and a second power module. The signal collection circuit collects the strong electric alternating current signal. The controller U8 outputs a 0-3.3V adjustable direct current control voltage in a PWM pulse width modulation mode according to the strong electric alternating current signal, and the direct current control voltage is amplified by the amplification filter circuit to obtain a 0-5V direct current control voltage, and the dimming information is transmitted by using the direct current control voltage.

Description

Technical Field

[0001] This utility model relates to the field of variable lane sign technology, and in particular to a dimming information remote transmission device. Background Technology

[0002] In the field of traffic infrastructure, reversible lane signs are key devices for guiding traffic flow, and their adaptive brightness is crucial for driving safety. However, current reversible lane sign dimming systems on the market have significant technical limitations: on the one hand, most existing dimming systems only support two fixed light intensity levels, "bright" and "dark," and cannot achieve adaptive dimming in all weather conditions and environments. Specifically, at the "bright" level, the signs are prone to glare in cloudy environments, while in bright sunshine, the brightness is too dim, making it difficult for the human eye to adapt to changes in lighting conditions and affecting the accuracy of information recognition; at the "dark" level, they also cannot achieve stepless and gentle dimming to follow the changes in light intensity during sunrise and sunset, making it difficult to match the gradual changes in natural light. To adjust the brightness of reversible lane signs according to actual lighting conditions, light intensity data collected by light sensors is required. For reversible lane signs located on the lane, they are affected by dynamic vehicle headlights. If the light sensor is placed on the reversible lane sign, the collected light intensity cannot represent the stable light intensity of the environment in which the reversible lane sign is located. Therefore, the light sensor should be placed in a position away from the influence of vehicle headlights. At the same time, to meet the requirements of the reversible lane controller to control multiple sets of reversible lane signs, long-distance dimming control is required. Utility Model Content

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, this utility model provides a dimming information remote transmission device.

[0004] This utility model provides a dimming information remote transmission device, comprising:

[0005] A dimming acquisition module is communicatively connected to a light sensor that samples the light intensity of stable light in a road environment. The dimming acquisition module includes a controller U2, which generates a PWM signal based on the light data acquired by the light sensor. The PWM signal drives a PWM AC voltage regulation circuit to generate a strong AC signal characterizing dimming information.

[0006] The dimming module supports remote connection to multiple dimming adapter boards. Each dimming adapter board includes: a controller U8, a signal acquisition circuit, an amplification and filtering circuit, and a second power supply module. The signal acquisition circuit acquires high-voltage AC signals. The controller U8 outputs an adjustable DC control voltage of 0-3.3V using PWM pulse width modulation based on the high-voltage AC signals, and the DC control voltage of 0-5V is amplified by the amplification and filtering circuit.

[0007] Furthermore, the PWM AC voltage regulation circuit includes: a PWM soft-start circuit connected to the PWM signal output pin of the controller U2, and a voltage regulation circuit, wherein the PWM pulse width modulation drive signal of the PWM soft-start circuit is processed by the Schmitt trigger NAND gate U5A to drive the voltage regulation circuit to generate a high-voltage AC signal.

[0008] Furthermore, the PWM soft-start circuit includes: an optocoupler U6, with input pin 1 connected to the PWM signal output pin of the controller U2 and input pin 2 grounded; output pin 4 of the optocoupler U6 is connected to a high-level signal via resistor R15, and output pin 3 of the optocoupler U6 is connected to a high-level signal via resistor R19, and is grounded via the soft-start circuit. The soft-start circuit consists of a field-effect transistor VT3, a Zener diode DS2, a resistor R24, and a capacitor C21. Resistor R24 ​​and capacitor C21 are connected in parallel with one end grounded and the other end connected to the Zener diode DS2. The Zener diode DS2 is connected to a high-level signal, and the gate of the field-effect transistor VT3 is connected between the Zener diode DS2 and the resistor R24.

[0009] Furthermore, the PWM soft-start circuit is connected to a feedback circuit. The feedback circuit detects the soft-start circuit status through a Schmitt trigger NAND gate and feeds back the soft-start circuit status to the controller U2 via an optocoupler. The feedback circuit includes a Schmitt trigger NAND gate U5B, one input of which is connected to pin 3 of the output side of the optocoupler U6, and the other input of which is connected to a 15.5V level. The output of the Schmitt trigger NAND gate U5B is connected to the N terminal of diode D6. The P terminal of diode D6 is connected to pin 2 of the input side of optocoupler U8 via resistor R27. Pin 1 of the input side of optocoupler U8 is connected to a 15.5V level via an indicator diode. Pin 4 of the output side of optocoupler U8 is grounded, and pin 3 of the output side of optocoupler U8 is connected to a 3.3V level via resistor R31. Pin 3 of the output side of optocoupler U8 is connected to the controller U2.

[0010] Furthermore, the PWM AC voltage regulation circuit also includes a relay switch circuit and an overvoltage detection circuit. The relay switch circuit is used to control the output of the PWM AC voltage regulation circuit and is driven by the controller U2. The overvoltage detection circuit collects the output of the PWM AC voltage regulation circuit.

[0011] Furthermore, the overvoltage detection circuit includes: an optocoupler U7, with pin 4 of the output side of the optocoupler U7 coupled to the controller U2 via resistor R25 and connected to a 3.3V level, and pin 3 of the output side of the optocoupler U7 grounded; a resistor R28 is provided between pins 1 and 2 of the input side of the optocoupler U7, and pin 1 of the input side of the optocoupler U7 is coupled between a series varistor RV2 and a bidirectional transient diode DX1 via resistor R22; the varistor RV2 is connected to the output of the PWM AC voltage regulation circuit.

[0012] Furthermore, the voltage regulating circuit includes: two N-channel field-effect transistors VT1 and VT3; the gates of VT1 and VT3 are coupled to resistor R13 via resistors R14 and R23 respectively, and resistors R14 and R23 are connected to Zener diode DS1, which is grounded; the sources of VT1 and VT3 are grounded; the drains of VT1 and VT3 are coupled to both ends of capacitor C18, and the drains of VT1 and VT3 are coupled to one plate of capacitors C17 and C19 respectively, with the other plates of capacitors C17 and C19 connected; the drain of VT1 is connected to the AC input via a relay switch circuit, and the drain of VT3 is the AC output; capacitor C17 is connected in parallel with capacitor C16 and varistor RV1; the voltage regulating circuit is connected to a voltage stabilizing filter circuit.

[0013] Furthermore, the signal acquisition circuit includes a signal acquisition chip U10, which is connected to a current sampling circuit and a voltage sampling circuit to acquire high-voltage AC signals. The signal acquisition chip U10 is connected to a controller U8 via an optocoupler U9.

[0014] Furthermore, the amplification and filtering circuit includes: an amplifier U11A, the non-inverting input terminal of the amplifier U11A is connected to the controller U8 via an RC filter circuit, the inverting input terminal of the amplifier U11A is grounded via a resistor R47, and the output terminal of the amplifier U11A is fed back to the inverting input terminal via a resistor R48; a filter capacitor C32 is provided at the output terminal of the amplifier U11A, and the output terminal of the amplifier U11A outputs a 0-5V DC control voltage.

[0015] The technical solution provided by this utility model embodiment has the following advantages compared with the prior art:

[0016] The dimming module of this invention generates a 0-220V high-voltage AC signal representing dimming information based on the light intensity information collected by the light sensor. Each dimming adapter board collects and analyzes the high-voltage AC signal, and drives the controlled power supply to power the variable sign according to the dimming information contained in the high-voltage AC signal, thereby adjusting the brightness of the variable sign. The use of a 0-220V high-voltage AC signal as a long-distance control transmission method avoids the problems of voltage drop accumulation, low economy, and low efficiency in long-distance transmission of low-voltage DC control; for example, low-voltage DC cannot be boosted, the conversion cost is high, and the voltage drop of a 24V DC system increases significantly with transmission distance, requiring an increase in the cross-sectional area of ​​the conductor for compensation. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the controller U2 provided in an embodiment of this utility model;

[0020] Figure 2 A schematic diagram of the first power supply module provided in an embodiment of this utility model;

[0021] Figure 3 A schematic diagram of a light sensor provided in an embodiment of this utility model;

[0022] Figure 4 A schematic diagram of a PWM AC voltage regulation circuit provided for an embodiment of this utility model;

[0023] Figure 5 A schematic diagram of a relay switch circuit provided for an embodiment of this utility model;

[0024] Figure 6 A schematic diagram of the overvoltage detection circuit provided in an embodiment of this utility model;

[0025] Figure 7 A schematic diagram of the controller U8 provided in an embodiment of this utility model;

[0026] Figure 8 A schematic diagram of the signal acquisition circuit provided in an embodiment of this utility model;

[0027] Figure 9A schematic diagram of the second power supply module provided in an embodiment of this utility model;

[0028] Figure 10 This is a schematic diagram of the amplification and filtering circuit provided in an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] The dimming information remote transmission device provided in this application includes:

[0032] A dimming acquisition module is provided, which is communicatively connected to a light sensor that samples the light intensity of stable light in a road environment. The dimming acquisition module includes a controller U2 and a PWM AC voltage regulation circuit. The controller U2 generates a PWM signal based on the light data collected by the light sensor, and the PWM signal drives the PWM AC voltage regulation circuit to generate a strong AC signal characterizing dimming information.

[0033] Each dimming adapter board includes: a controller U8, a signal acquisition circuit, an amplification and filtering circuit, and a second power supply module. The signal acquisition circuit acquires a high-voltage AC signal. The controller U8 outputs an adjustable DC control voltage of 0-3.3V using PWM pulse width modulation based on the high-voltage AC signal, and the voltage is amplified by the amplification and filtering circuit to obtain a DC control voltage of 0-5V. The DC control voltage drives the controlled power supply to power the variable sign, adaptively adjusting the brightness of the variable sign. In an embodiment of the invention, one acquisition dimming module supports the connection of multiple dimming adapter boards, and the dimming adapter boards are set across intersections to realize the adjustment of the brightness of variable signs at multiple intersections.

[0034] In the specific implementation process, such as Figure 3 As shown, one example of a light sensor is the BH170, a digital ambient light sensor (measurement range: 1–65535 lx), which uses I0... 2 The light sensor described in this application communicates via an I / O interface. 2 The controller U2 of the acquisition and dimming module is connected via the C communication bus.

[0035] The acquisition and dimming module includes: a controller U2, a PWM AC voltage regulation circuit, and a first power supply module that supplies power to the acquisition and dimming module and the light sensor.

[0036] like Figure 1 As shown, the controller U2 is electrically connected to a reset circuit, a crystal oscillator circuit, a controller U2 power supply filter circuit, and a debugging interface. The controller U2 generates a PWM signal based on the light data collected by the light sensor. This PWM signal drives a PWM AC voltage regulation circuit to generate a strong AC signal characterizing dimming information.

[0037] In the specific implementation process, such as Figure 4 As shown, the PWM AC voltage regulation circuit includes: a PWM soft-start circuit, a feedback circuit, and a voltage regulation circuit.

[0038] The PWM soft-start circuit includes: an optocoupler U6, with its input pin 1 connected to the PWM signal output pin of the controller U2 and its input pin 2 grounded; its output pin 4 connected to a 15.5V level via resistor R15, and its output pin 3 connected to a 15.5V high level via resistor R19, and its output pin 3 grounded via the soft-start circuit. The soft-start circuit consists of a field-effect transistor VT3, a Zener diode DS2, a resistor R24, and a capacitor C21. Resistor R24 ​​and capacitor C21 are connected in parallel with one end grounded and the other end connected to the Zener diode DS2, which is connected to a 15.5V high level. The gate of the field-effect transistor VT3 is connected between the Zener diode DS2 and resistor R24. The PWM soft-start circuit converts the 3.3V PWM signal from the controller U2 into a 15V PWM drive voltage via optocoupler U6. The necessary conditions for this conversion are controlled by the soft-start circuit consisting of MOSFET VT3, Zener diode DS2, and resistors R24 and capacitor C21. Upon initial power-up, when the voltage is less than 10V, the soft-start circuit is off, and the output of optocoupler U6 is high, effectively shutting down its output. Once the voltage rises and stabilizes at approximately 10V, the soft-start circuit connects to ground. Through the rapid switching of the transistor on the output side of optocoupler U6, a PWM drive signal is generated and provided to the subsequent stages. The PWM soft-start circuit effectively suppresses surge overvoltage interference and instantaneous overcurrent impacts during power-up.

[0039] The feedback circuit detects the status of the soft-start circuit in the PWM soft-start circuit through a Schmitt trigger NAND gate and feeds back the status to the controller via an optocoupler. The feedback circuit includes a Schmitt trigger NAND gate U5B. One input of Schmitt trigger NAND gate U5B is connected to pin 3 of the output side of optocoupler U6, and the other input of Schmitt trigger NAND gate U5B is connected to a 15.5V level. The output of Schmitt trigger NAND gate U5B is connected to the N terminal of diode D6. The P terminal of diode D6 is connected to pin 2 of the input side of optocoupler U8 via resistor R27. Pin 1 of the input side of optocoupler U8 is connected to a 15.5V level via an indicator diode. Pin 4 of the output side of optocoupler U8 is grounded, and pin 3 of the output side of optocoupler U8 is connected to a 3.3V level via resistor R31. Pin 3 of the output side of optocoupler U8 is connected to the controller U2. The feedback circuit is used to feed back error signals to the controller U2.

[0040] The voltage regulation circuit is driven by a PWM soft-start circuit. The PWM pulse width modulation drive signal of the PWM soft-start circuit is processed by a Schmitt trigger NAND gate U5A and then drives the voltage regulation circuit. One input of the Schmitt trigger NAND gate U5A is coupled to pin 4 of the output side of the optocoupler U6 via resistor R17. The other input of the Schmitt trigger NAND gate U5A is connected to a 15.5V level. The output of the Schmitt trigger NAND gate U5A is connected to resistor R16, which is grounded. The output of the Schmitt trigger NAND gate U5A is coupled to the voltage regulation circuit via resistor R13. The Schmitt trigger NAND gate U5A filters out the jitter of the PWM pulse width modulation drive signal. The voltage regulation circuit includes: two N-channel field-effect transistors VT1 and VT3; the gates of VT1 and VT3 are coupled to resistor R13 via resistors R14 and R23 respectively, and resistors R14 and R23 are connected to Zener diode DS1, which is grounded; the sources of VT1 and VT3 are grounded; the drains of VT1 and VT3 are coupled to both ends of capacitor C18, and the drains of VT1 and VT3 are coupled to one plate of capacitors C17 and C19 respectively, with the other plates of capacitors C17 and C19 connected; the drain of VT1 is connected to the AC input via a relay switch circuit, and the drain of VT3 is the AC output; capacitor C17 is connected in parallel with capacitor C16 and varistor RV1; the voltage regulation circuit is connected to a voltage regulator filter circuit, which provides a 15.5V level. The PWM (Pulse Width Modulation) drive signal adjusts the on / off cycles of MOSFETs VT1 and VT3, regulating the duty cycle (pulse width). In each cycle, the sine wave is divided into N equal parts according to the PWM waveform frequency. Within each part, the angle of the conducting portion of the MOSFET switching element is used to transform the narrow conducting pulse into a pulse of equal width but unequal height with the same area, thus changing the amplitude. The transformed pulses after N equal parts form a stepped, amplitude-decreasing approximate sine wave. If N is sufficiently large and the output waveform is filtered, the result will be a smooth sine wave. This yields a high-voltage AC signal containing dimming information.

[0041] In a preferred embodiment, the PWM AC voltage regulator circuit further includes a relay switch circuit, which is used to control the output of the PWM AC voltage regulator circuit and is driven by the controller U2. Specifically, as shown in the example... Figure 5As shown, the relay switch circuit includes: an optocoupler U4, with its input pin 1 connected to a 3.3V level via resistor R7, and its input pin 2 connected to controller U2; its output pin 4 connected to a 12V level via resistor R8, its output pin 3 grounded, and its output pin 4 coupled to the base of transistor Q1 via resistor R11. Transistor Q1 is connected to a relay coil, which is connected to a 12V drive level. Transistor Q1 controls the relay coil to power on, and the relay contacts are connected to a voltage regulator circuit to control the output of the voltage regulator circuit. Figure 6 As shown, the overvoltage detection circuit includes: an optocoupler U7, with pin 4 of the output side of the optocoupler U7 coupled to the controller U2 via resistor R25 and connected to a 3.3V level; pin 3 of the output side of the optocoupler U7 is grounded. A resistor R28 is placed between pins 1 and 2 of the input side of the optocoupler U7; pin 1 of the input side of the optocoupler U7 is coupled between a series varistor RV2 and a bidirectional transient diode DX1 via resistor R22; the varistor RV2 is connected to the output of the PWM AC voltage regulator circuit. The overvoltage detection circuit monitors the voltage on the output side of the PWM AC voltage regulator circuit in real time to prevent overshoot or surge overvoltage on the output side.

[0042] like Figure 2 As shown, the first power module includes a buck regulator chip U1 and a buck regulator chip U3. The buck regulator chip U1 converts 12V to 5V, and the buck regulator chip U3 converts 5V to 3.3V. The 3.3V output from the first power module powers the controller U2 via a power filter circuit. The 3.3V output from the first power module also powers the parasitic circuitry of the controller U2. Furthermore, the 3.3V output from the first power module powers the light sensor and the bus between the light sensor and the controller U2. Finally, the 3.3V output from the first power module powers the display and the feedback circuit.

[0043] In a preferred embodiment, in order to display the working status of the acquisition dimming module, the acquisition dimming module is equipped with a display, and the display is connected to the controller U2 via an SPI bus.

[0044] The light intensity data collected by the light sensor provides data support for the brightness adjustment of the variable lane sign. For variable lane signs located in the lane, they are affected by dynamic vehicle headlights. If the light sensor is placed directly on the variable lane sign, the collected light intensity cannot represent the stable light intensity of the environment in which the variable lane sign is located. Therefore, the light sensor is placed away from the influence of vehicle headlights. Simultaneously, to meet the requirements of the variable lane controller to control multiple sets of variable lane signs, long-distance dimming control is needed. This application uses a 0-220V high-voltage AC signal as the long-distance control transmission method to avoid the problems of voltage drop accumulation, low economy, and low efficiency in long-distance transmission of low-voltage DC control; such as the inability to boost low-voltage DC, high conversion costs, and the significant voltage drop of a 24V DC system with increasing transmission distance requiring increased conductor cross-sectional area compensation.

[0045] The acquisition and dimming module is connected to the dimming adapter board via a transmission line. The dimming adapter board converts the 0-220V high-voltage AC signal output by the acquisition and dimming module into a 0-5V DC control voltage.

[0046] In specific implementation, the dimming adapter board includes: controller U8, signal acquisition circuit, amplification and filtering circuit, and second power supply module.

[0047] Among them, such as Figure 7 As shown, the controller U8 is electrically connected to the reset circuit, the crystal oscillator circuit, the controller U8 power supply filter circuit, and the debugging interface.

[0048] The signal acquisition circuit includes a signal acquisition chip U10, which is connected to a current sampling circuit and a voltage sampling circuit. The signal acquisition chip U10 is also connected to a controller U8 via an optocoupler U9. For example... Figure 8As shown, the signal acquisition chip U10 uses the HLW8032 chip. The TX pin of the HLW8032 chip is connected to pin 2 of the input side of the optocoupler U9. Pin 1 of the input side of the optocoupler U9 is connected to a 5V level via resistor R39. Pin 4 of the output side of the optocoupler U9 is connected to VDD5V via resistor R40 and is also connected to the controller U8. Pin 3 of the output side of the optocoupler U9 is grounded. The optocoupler U9 achieves serial communication isolation. The optocoupler cuts off the direct electrical connection between the input and output terminals, preventing high-voltage circuits from interfering with or damaging low-voltage control circuits, thus improving system safety. Through the "electric-optical-electric" signal conversion mechanism, electromagnetic interference (EMI) and noise are effectively suppressed, ensuring the stability of UART signals in long-distance transmission and reducing the bit error rate. The IP and IN pins of the HLW8032 chip are connected to a current differential sampling circuit. The current differential sampling circuit includes resistors R42 and R44 respectively set on the current differential sampling lines. The two current differential sampling lines are grounded through capacitors C28 and C29 respectively. A coupling resistor R43 is connected between the two current differential sampling lines. The VP pin of the HLW8032 chip is connected to a voltage divider sampling circuit. The voltage divider sampling circuit includes resistors R34, R35, R36, R37, and R38 connected in series between the output of the dimming module and ground, and capacitor C27 connected in parallel with resistor R38.

[0049] During the operation of the dimming adapter board, the controller U8 parses and processes the received serial port information to obtain the dimming information transmitted by the dimming module, and outputs an adjustable DC control voltage of 0-3.3V using PWM pulse width modulation based on the dimming information.

[0050] like Figure 9 As shown, the second power supply module includes: an isolated power supply chip that supplies power to the controller U8 and its peripheral circuits and to the signal acquisition chip U10. The isolated power supply chip converts VDD5V into V5V voltage for powering the signal acquisition chip U10.

[0051] like Figure 10 As shown, the amplification and filtering circuit includes: amplifier U11A, the non-inverting input terminal of amplifier U11A is connected to controller U8 via an RC filter circuit, the inverting input terminal of amplifier U11A is grounded via resistor R47, and the output terminal of amplifier U11A is fed back to the inverting input terminal via resistor R48. A filter capacitor C32 is installed at the output terminal of amplifier U11A, and the output terminal of amplifier U11A outputs a 0-5V DC control voltage. Amplifier U11A converts the 0-3.3V adjustable DC control voltage output from controller U8 into a smooth 0-5V analog DC control voltage.

[0052] In the embodiments provided by this utility model, it should be understood that the disclosed structures and methods can be implemented in other ways. For example, the structural embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, structures, or units, and may be electrical, mechanical, or other forms.

[0053] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0054] Furthermore, in the various embodiments of this utility model, the functional units can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0055] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A dimming information remote transmission device, characterized by comprising: include: A dimming acquisition module is communicatively connected to a light sensor that samples the light intensity of stable light in a road environment. The dimming acquisition module includes a controller U2, which generates a PWM signal based on the light data acquired by the light sensor. The PWM signal drives a PWM AC voltage regulation circuit to generate a strong AC signal characterizing dimming information. The dimming module supports remote connection to multiple dimming adapter boards. Each dimming adapter board includes: a controller U8, a signal acquisition circuit, an amplification and filtering circuit, and a second power supply module. The signal acquisition circuit acquires high-voltage AC signals. The controller U8 outputs an adjustable DC control voltage of 0-3.3V using PWM pulse width modulation based on the high-voltage AC signals, and the DC control voltage of 0-5V is amplified by the amplification and filtering circuit.

2. The dimming information booster of claim 1, wherein The PWM AC voltage regulation circuit includes: a PWM soft-start circuit connected to the PWM signal output pin of the controller U2, and a voltage regulation circuit, wherein the PWM pulse width modulation drive signal of the PWM soft-start circuit is processed by the Schmitt trigger NAND gate U5A and then drives the voltage regulation circuit to generate a high-voltage AC signal.

3. The dimming information far-transmission device according to claim 2, wherein The PWM soft-start circuit includes: an optocoupler U6, with input pin 1 connected to the PWM signal output pin of controller U2 and input pin 2 grounded; output pin 4 of optocoupler U6 is connected to a high-level signal via resistor R15, and output pin 3 of optocoupler U6 is connected to a high-level signal via resistor R19, and is grounded via the soft-start circuit. The soft-start circuit consists of a field-effect transistor VT3, a Zener diode DS2, a resistor R24, and a capacitor C21. Resistor R24 ​​and capacitor C21 are connected in parallel with one end grounded and the other end connected to Zener diode DS2. Zener diode DS2 is connected to a high-level signal, and the gate of field-effect transistor VT3 is connected between Zener diode DS2 and resistor R24.

4. The dimming information far-transmission device according to claim 3, wherein The PWM soft-start circuit is connected to a feedback circuit. The feedback circuit detects the soft-start circuit status through a Schmitt trigger NAND gate and feeds back the soft-start circuit status to the controller U2 via an optocoupler. The feedback circuit includes a Schmitt trigger NAND gate U5B. One input of the Schmitt trigger NAND gate U5B is connected to pin 3 of the output side of the optocoupler U6. The other input of the Schmitt trigger NAND gate U5B is connected to a 15.5V level. The output of the Schmitt trigger NAND gate U5B is connected to the N terminal of diode D6. The P terminal of diode D6 is connected to pin 2 of the input side of optocoupler U8 via resistor R27. Pin 1 of the input side of optocoupler U8 is connected to a 15.5V level via an indicator diode. Pin 4 of the output side of optocoupler U8 is grounded. Pin 3 of the output side of optocoupler U8 is connected to a 3.3V level via resistor R31. Pin 3 of the output side of optocoupler U8 is connected to the controller U2.

5. The dimming information booster of claim 1, wherein The PWM AC voltage regulation circuit also includes a relay switch circuit and an overvoltage detection circuit. The relay switch circuit is used to control the output of the PWM AC voltage regulation circuit and is driven by the controller U2. The overvoltage detection circuit collects the output of the PWM AC voltage regulation circuit.

6. The dimming information booster of claim 5, wherein, The relay switch circuit includes: an optocoupler U4, with its input pin 1 connected to a 3.3V level via resistor R7, and its input pin 2 connected to controller U2; its output pin 4 connected to a 12V level via resistor R8, its output pin 3 grounded, and its output pin 4 coupled to the base of transistor Q1 via resistor R11. Transistor Q1 is connected to a relay coil, which is connected to a 12V drive level. Transistor Q1 controls the relay coil to power on, and the relay contacts are connected to a voltage regulating circuit.

7. The dimming information far-transmission device according to claim 5, wherein The overvoltage detection circuit includes: an optocoupler U7, with pin 4 of the output side of the optocoupler U7 coupled to the controller U2 via resistor R25 and connected to a 3.3V level; pin 3 of the output side of the optocoupler U7 is grounded; a resistor R28 is provided between pins 1 and 2 of the input side of the optocoupler U7; pin 1 of the input side of the optocoupler U7 is coupled between a series varistor RV2 and a bidirectional transient diode DX1 via resistor R22; the varistor RV2 is connected to the output of the PWM AC voltage regulation circuit.

8. The dimming information booster of claim 2, wherein, The voltage regulation circuit includes: two N-channel field-effect transistors VT1 and VT3; the gates of VT1 and VT3 are coupled to resistor R13 via resistors R14 and R23 respectively, and resistors R14 and R23 are connected to Zener diode DS1, which is grounded; the sources of VT1 and VT3 are grounded; the drains of VT1 and VT3 are coupled to both ends of capacitor C18, and the drains of VT1 and VT3 are coupled to one plate of capacitors C17 and C19 respectively, with the other plates of capacitors C17 and C19 connected; the drain of VT1 is connected to the AC input via a relay switch circuit, and the drain of VT3 is the AC output; capacitor C17 is connected in parallel with capacitor C16 and varistor RV1; the voltage regulation circuit is connected to a voltage regulation and filtering circuit.

9. The dimming information booster of claim 1, wherein, The signal acquisition circuit includes a signal acquisition chip U10, which is connected to a current sampling circuit and a voltage sampling circuit. The current sampling circuit and the voltage sampling circuit are used to acquire high-voltage AC signals. The signal acquisition chip U10 is connected to the controller U8 via an optocoupler U9.

10. The dimming information booster of claim 1, wherein The amplification and filtering circuit includes: an amplifier U11A, the non-inverting input terminal of the amplifier U11A is connected to the controller U8 via an RC filter circuit, the inverting input terminal of the amplifier U11A is grounded via a resistor R47, and the output terminal of the amplifier U11A is fed back to the inverting input terminal via a resistor R48; a filter capacitor C32 is provided at the output terminal of the amplifier U11A, and the output terminal of the amplifier U11A outputs a 0-5V DC control voltage.

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