Visible light communication driving circuit and visible light communication driving circuit board

Abstract

The utility model provides a visible light communication drive circuit and a visible light communication drive circuit board. The visible light communication drive circuit comprises a PWM dimming chip and a drive circuit power supply module, wherein the PWM dimming chip is connected between a digital baseband signal processing module and an LED light source and is used for driving the LED light source; the digital baseband signal processing module is connected with the PWM dimming chip through two input lines, and an adjustable resistor R10 is arranged between the two input lines, so that the PWM dimming chip is configured to be in a single-end input mode or a differential input mode by adjusting the resistance value of the adjustable resistor R10; the output end of the PWM dimming chip is connected with the negative electrode of the LED light source, and the positive electrode of the LED light source is connected with the positive electrode of the drive circuit power supply module. The visible light communication driving circuit board comprises a PCB substrate and a visible light communication driving circuit arranged on the PCB substrate. According to the utility model, long-distance high-speed visible light communication can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of visible light communication, concretely relates to a visible light communication drive circuit and visible light communication drive circuit board. BACKGROUND

[0002] ‌Bias-Tee technology is commonly used in visible light communication systems as a driving technique for LED light sources. This technology is a technique that transmits both DC and AC power on the same transmission line. In the application of LEDs, Bias-Tee technology is mainly used to provide DC bias voltage and AC signal for LEDs. Specifically, Bias-Tee technology combines DC bias voltage and AC signal through a coupler and transmits them to the LED, while ensuring that the two do not interfere with each other. This technology is widely used in LED drive circuits, which can simplify circuit design and improve system stability and reliability‌.

[0003] The driving advantages of Bias-Tee in visible light communication mainly include the following aspects‌:

[0004] ‌(1) Improve system transmission bandwidth: by using Bias-Tee elements to add bias current for LED operation, the LED can work in the linear region, thereby setting the modulation degree, realizing signal superposition, and improving the system transmission bandwidth;

[0005] ‌(2) Reduce signal interference: the DC port of Bias-Tee is composed of a feed inductance, which is used to add DC bias to prevent AC signal leakage from the RF port to the power supply system. Under ideal conditions, the DC port will not affect the RF end signal, thereby reducing signal interference;

[0006] ‌(3) Improve system performance: key parameters of Bias-Tee such as DC end bias voltage and current, RF end and DC end isolation, RF bandwidth, etc. have important influence on the performance of the system. By selecting high-frequency inductors and capacitors with ultra-wideband, close to ideal, and no resonance point, the interference to other elements can be reduced, thereby improving the overall performance of the system.

[0007] However, in actual use, when the transmission rate of the communication system is 50Mbps, the sending end uses Bias-Tee mode to drive the LED to send signals, and the receiver is 2000 meters away, the detector will not be able to receive useful signals. SUMMARY

[0008] In order to solve the problems existing in the prior art, a visible light communication drive circuit and visible light communication drive circuit board capable of realizing long-distance high-speed visible light communication are provided.

[0009] The technical scheme adopted by the utility model is:

[0010] The utility model provides a visible light communication drive circuit, including connecting between digital baseband signal processing module and LED light source, for drive the PWM light control chip of LED light source, still include drive circuit power module;

[0011] Two input lines are connected between the digital baseband signal processing module and the PWM light control chip, and an adjustable resistance R10 is arranged between the two input lines, so that the PWM light control chip is configured as a single-ended input mode or a differential input mode by adjusting the resistance value of the adjustable resistance R10.

[0012] The output end of the PWM light control chip is connected to the negative pole of the LED light source, and the positive pole of the LED light source is connected to the voltage output end of the drive circuit power module.

[0013] Based on the above, the PWM light control chip adopts a six-channel laser switch chip iC-HG30.

[0014] Based on the above, the drive circuit power module includes a voltage stabilizing chip U1 for outputting voltage to the PWM light control chip.

[0015] Based on the above, the drive circuit power module adopts DC direct current wide voltage power supply, and the voltage range is 6V to 17V.

[0016] The utility model provides a visible light communication drive circuit board, including PCB substrate and the visible light communication drive circuit of arranging on the PCB substrate.

[0017] The PWM light control chip is arranged in the middle of the PCB substrate, and the peripheral circuit of the PWM light control chip is arranged around the periphery of the PWM light control chip.

[0018] The LED light source is arranged above the PWM light control chip, and the drive circuit power module is arranged on the right side of the PWM light control chip.

[0019] The left lower side of the PWM light control chip is provided with a connection point for connecting the digital baseband signal processing module.

[0020] Based on the above, four fixing holes are arranged in the middle of the PCB substrate, and the fixing holes are used for fixing the heat dissipation fins.

[0021] The utility model has substantial features and progress compared with the prior art, specifically:

[0022] The visible light communication driving circuit based on the PWM dimming chip adopts a switching mode to control the LED light source, the output rate can be controlled by changing the signal frequency of the digital baseband signal processing module inputting the PWM dimming chip, the switching rate can reach 200MHz, high-speed and high-power driving of the LED light source is realized, and thus 50Mbps @2000m reliable visible light communication is realized. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the circuit principle diagram of the driving circuit power supply module in the embodiment 1 of the utility model.

[0024] Figure 2 It is the circuit principle diagram of the driving circuit power supply module in the embodiment 1 of the utility model.

[0025] Figure 3 It is the visible light communication driving circuit board PCB circuit diagram of the embodiment 2 of the utility model. DETAILED DESCRIPTION

[0026] In order to enable the above object, features and advantages of the utility model to be more clearly understood, the utility model will be further described below with reference to the drawings and specific embodiments. It should be explained that the embodiments of the application and the features in the embodiments can be combined with each other without conflict.

[0027] Embodiment 1

[0028] As shown in Figure 1 The embodiment provides a visible light communication driving circuit, which comprises a PWM dimming chip connected between a digital baseband signal processing module and an LED light source and used for driving the LED light source, and further comprises a driving circuit power supply module.

[0029] The digital baseband signal processing module and the PWM dimming chip are connected through two input lines, and an adjustable resistor R10 is arranged between the two input lines to configure the PWM dimming chip to a single-ended input mode or a differential input mode by adjusting the resistance value of the adjustable resistor R10. The adjustment principle of the single-ended input mode and the differential input mode is that when the resistance value of the adjustable resistor R10 is adjusted to be very large so that the two input lines are equivalent to open circuit, the PWM dimming chip is in the single-ended input mode; when the resistance value of the adjustable resistor R10 is adjusted to be appropriate so that the two input lines are equivalent to a pass, the PWM dimming chip is in the differential input mode.

[0030] The output end of the PWM dimming chip is connected to the negative pole of the LED light source, and the positive pole of the LED light source is connected to the voltage output end of the driving circuit power supply module. The PWM dimming chip controls the on-off of the LED light source between the negative pole and the GND to control the switching rate of the LED light source, which facilitates subsequent PCB wiring.

[0031] In some example embodiments, the PWM dimming chip adopts a six-channel laser switch chip iC-HG30. The six-channel laser switch chip iC-HG30 can perform non-spiking switching of the LED with a clear current pulse (frequency range: DC to 250MHz). The LED current is determined by the voltage on pin CIx. The six fast switches are independently controlled by TTL input.

[0032] In some example embodiments, as shown in Figure 2 The driving circuit power supply module includes a voltage stabilizing chip U1 for outputting voltage to the PWM dimming chip. In specific use, the model of the voltage stabilizing chip U1 can be selected according to the designed voltage requirement, such as XL6009. XL6009 is a single-chip integrated circuit specially designed for step-up / step-down, which can work in the input voltage range of DC 5V to 32V, and it has a built-in fixed frequency oscillator (400KHz), a reference voltage stabilizer (1.25V) and a frequency compensation circuit.

[0033] In some example embodiments, the driving circuit power supply module adopts DC direct current wide voltage power supply with a voltage range of 6V to 17V, so that the visible light communication driving circuit can support different types of LED light sources to provide reliable voltage.

[0034] Embodiment 2

[0035] This embodiment provides a visible light communication driving circuit board, as shown in Figure 3 The visible light communication driving circuit board includes a PCB substrate and the visible light communication driving circuit of embodiment 1 arranged on the PCB substrate.

[0036] The PWM dimming chip is arranged at the middle part of the PCB substrate, and the peripheral circuit of the PWM dimming chip is arranged around the PWM dimming chip.

[0037] The LED light source is arranged above the PWM dimming chip, and the driving circuit power supply module is arranged at the right side of the PWM dimming chip.

[0038] The left lower side of the PWM dimming chip is provided with a connection point for connecting the digital baseband signal processing module.

[0039] In some example embodiments, four fixing holes 1 are arranged in the middle of the PCB substrate, and the fixing holes 1 are used for fixing the arranged heat dissipation fins. By arranging the heat dissipation fins, the PWM dimming chip can be prevented from overheating, the driving output is unstable, the PWM dimming chip or the LED light source is effectively prevented from being damaged due to abnormal conditions, and the reliability and stability of the circuit are improved.

[0040] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A visible light communication driving circuit, characterized by: The PWM dimming chip is connected between the digital baseband signal processing module and the LED light source for driving the LED light source, and the driving circuit power supply module is further included; The digital baseband signal processing module and the PWM dimming chip are connected through two input lines, and an adjustable resistor R10 is arranged between the two input lines to configure the PWM dimming chip into a single-ended input mode or a differential input mode by adjusting the resistance value of the adjustable resistor R10; The output end of the PWM dimming chip is connected to the negative pole of the LED light source, and the positive pole of the LED light source is connected to the voltage output end of the driving circuit power supply module.

2. The visible light communication driving circuit according to claim 1, wherein: The PWM dimming chip is a six-channel laser switch chip iC-HG30.

3. The visible light communication driving circuit according to claim 1 or 2, characterized by The driving circuit power supply module includes a voltage stabilizing chip U1 for outputting voltage to the PWM dimming chip.

4. The visible light communication driving circuit according to claim 3, wherein The driving circuit power supply module adopts DC direct current wide voltage power supply, and the voltage range is 6V to 17V.

5. A visible light communication driver circuit board, characterized by: The PCB substrate and the visible light communication driving circuit according to any one of claims 1-4 arranged on the PCB substrate are included; The PWM dimming chip is arranged in the middle of the PCB substrate, and the peripheral circuit of the PWM dimming chip is arranged around the PWM dimming chip; The LED light source is arranged above the PWM dimming chip, and the driving circuit power supply module is arranged on the right side of the PWM dimming chip; The left lower side of the PWM dimming chip is provided with a connection point for connecting the digital baseband signal processing module.

6. The visible light communication driving circuit board according to claim 5, wherein: Four fixing holes are arranged in the middle of the PCB substrate, and the fixing holes are used for fixing the heat dissipation fins.

Images