A voltage control circuit and a communication device

Abstract

The application discloses a voltage control circuit and a communication device, wherein the voltage control circuit comprises a processor module and a voltage control module; an output end of the processor module is connected with an input end of the voltage control module; an output end of the voltage control module is connected with a power supply chip in a visible light communication circuit, and the power supply chip is used for supplying power for a bias circuit in a transmission channel of the visible light communication circuit; wherein the processor module outputs a control signal to the voltage control module, so that the voltage control module controls the power supply chip to output a first voltage, and a voltage value of the first voltage is determined by the control signal.

Description

Technical Field

[0001] This application relates to the field of visible light communication technology, and in particular to a voltage control circuit and communication device. Background Technology

[0002] Visible light communication technology utilizes the persistence of vision effect in the human eye to hide information within rapidly changing illumination intensity, thus perfectly combining the dual functions of lighting and communication. In related technologies, visible light communication systems apply a signal to a fixed DC bias and then transmit the signal into free space via a light source. However, a fixed DC bias may affect the networking flexibility of visible light communication systems, as well as their communication speed, coverage, and other communication performance characteristics. Utility Model Content

[0003] To address the related technical problems, embodiments of this application provide a voltage control circuit and a communication device.

[0004] The technical solution of this application embodiment is implemented as follows:

[0005] This application provides a voltage control circuit, including: a processor module and a voltage control module; the output terminal of the processor module is connected to the input terminal of the voltage control module; the output terminal of the voltage control module is connected to a power supply chip in a visible light communication circuit, the power supply chip being used to supply power to the bias circuit in the transmission channel of the visible light communication circuit; wherein...

[0006] The processor module outputs a control signal to the voltage control module, so that the voltage control module controls the power chip to output a first voltage, the value of which is determined by the control signal.

[0007] In the above scheme, the voltage control module includes: a first digital-to-analog converter (DAC) circuit and a resistor divider circuit; the output terminal of the processor module is connected to the input terminal of the first DAC circuit, the output terminal of the first DAC circuit is connected to the power supply chip, and the resistor divider circuit is connected in parallel with the power supply chip; wherein,

[0008] The processor module outputs the control signal to the first digital-to-analog converter circuit, and the first digital-to-analog converter circuit responds to the control signal by outputting a first current to the resistor divider circuit, so that the power chip outputs the first voltage to the bias circuit.

[0009] In the above scheme, the output terminal of the processor module and the input terminal of the voltage control module are connected through an integrated circuit bus (I2C, Inter-Integrated Circuit).

[0010] In the above scheme, the processor module includes: a processor chip and a temperature sensor connected to the processor chip; wherein,

[0011] The processor chip is used to output the control signal based on the temperature measurement value output by the temperature sensor.

[0012] This application embodiment also provides a communication device, including: a visible light communication circuit and a voltage control circuit. The voltage control circuit includes: a processor module and a voltage control module; the output terminal of the processor module is connected to the input terminal of the voltage control module; the output terminal of the voltage control module is connected to a power supply chip in the visible light communication circuit, the power supply chip being used to supply power to the bias circuit in the transmission channel of the visible light communication circuit; wherein...

[0013] The processor module outputs a control signal to the voltage control module, so that the voltage control module controls the power chip to output a first voltage, the value of which is determined by the control signal.

[0014] In the above scheme, the voltage control module includes: a first digital-to-analog converter circuit and a resistor voltage divider circuit; the output terminal of the processor module is connected to the input terminal of the first digital-to-analog converter circuit, the output terminal of the first digital-to-analog converter circuit is connected to the power supply chip, and the resistor voltage divider circuit is connected in parallel with the power supply chip; wherein,

[0015] The processor module outputs the control signal to the first digital-to-analog converter circuit, and the first digital-to-analog converter circuit responds to the control signal by outputting a first current to the resistor divider circuit, so that the power chip outputs the first voltage to the bias circuit.

[0016] In the above scheme, the output terminal of the processor module and the input terminal of the voltage control module are connected via an I2C bus.

[0017] In the above scheme, the processor module includes: a processor chip and a temperature sensor connected to the processor chip; wherein,

[0018] The processor chip is used to output the control signal based on the temperature measurement value output by the temperature sensor.

[0019] In the above scheme, the visible light communication circuit includes: a baseband unit, a transmitting channel, and a receiving channel; the output terminal of the baseband unit is connected to the input terminal of the transmitting channel, the output terminal of the transmitting channel is used to connect to a light source, the input terminal of the baseband unit is connected to the output terminal of the receiving channel, and the input terminal of the receiving channel is used to connect to a photodetector.

[0020] In the above scheme, the transmission channel includes: a second digital-to-analog converter circuit, a first amplifier, and a bias circuit. The input terminal of the second digital-to-analog converter circuit is connected to the output terminal of the baseband unit, the output terminal of the second digital-to-analog converter circuit is connected to the input terminal of the first amplifier, the output terminal of the first amplifier is connected to the input terminal of the bias circuit, and the output terminal of the bias circuit is used to connect to a light source.

[0021] The receiving channel includes: a first analog-to-digital converter (ADC) circuit, a second amplifier, and a DC blocking circuit. The output of the DC blocking circuit is connected to a photodetector, the output of the DC blocking circuit is connected to the input of the second amplifier, the output of the second amplifier is connected to the input of the first ADC circuit, and the output of the first ADC circuit is connected to the input of the baseband unit.

[0022] In the voltage control circuit and communication device provided in this application embodiment, a voltage control circuit is set up, and a processor module outputs a control signal to the voltage control circuit so that the voltage control module controls the first voltage of the bias circuit in the transmission channel of the visible light communication circuit from the power supply chip. The voltage value of the first voltage is determined by the control signal output by the processor module. In this way, when the control signal output by the processor module is different, the first voltage output by the power supply chip to the bias circuit in the visible light communication circuit is also different. This realizes the function of real-time adjustable bias voltage of the light source in the visible light communication circuit, so that the bias circuit in the visible light communication system can be adapted to different light sources or to different working environments of the same light source, thereby improving the networking flexibility and communication performance of the visible light communication system. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a visible light communication system based on related technologies.

[0024] Figure 2 This is a schematic diagram of a voltage control circuit structure according to an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the second voltage control circuit structure according to an embodiment of this application;

[0026] Figure 4This is a schematic diagram of the third voltage control circuit structure according to an embodiment of this application;

[0027] Figure 5 This is a schematic diagram illustrating the implementation principle of adjustable bias voltage based on changes in ambient temperature, as described in an embodiment of this application. Detailed Implementation

[0028] Visible light communication technology is a novel wireless optical communication technology that combines lighting and communication. This technology utilizes the persistence of vision effect in the human eye to hide information within rapidly changing light intensities, thus perfectly combining the dual functions of lighting and communication. Visible light communication can serve as a supplement to wireless access and can be used in specialized fields such as electromagnetically sensitive locations, secure communication, mines, and data centers.

[0029] At the transmitting end of a visible light communication system, visible light sources such as light-emitting diodes (LEDs) or laser diodes (LDs) emit light signals with rapid brightness changes that are difficult to distinguish with the naked eye, thus transmitting information. At the receiving end of the visible light communication system, photoelectric converters such as photodetectors (PDs) convert the received light signals into electrical signals to acquire information. Specifically, refer to... Figure 1 The schematic diagram of the visible light communication system illustrates the following: At the transmitting end, the downlink transmission signal is output from the baseband unit, converted into an analog signal by a digital-to-analog converter (DAC), and then amplified by an amplifier. The amplified analog signal is then biased by a bias circuit with a fixed DC voltage before being output to free space via a light source. At the receiving end, a digital photodetector (PD) converts the received optical signal into an electrical signal. After DC blocking, the electrical signal is amplified and output to an analog-to-digital converter (ADC). The ADC then converts the electrical signal into a digital signal and inputs it to the baseband unit. To achieve full-duplex communication, the uplink of the visible light communication system typically uses infrared technology.

[0030] As discussed above, visible light communication systems apply a signal to a fixed DC bias and then transmit the signal into free space via a light source. In related technologies, visible light communication systems typically employ a fixed bias circuit. However, in practical applications, different light sources require different bias circuits. Furthermore, even for the same light source, the internal equivalent resistance varies under different ambient temperatures. Therefore, this fixed bias circuit configuration affects the networking flexibility of visible light communication systems and may impact communication speed, coverage, and other communication performance due to variations in the ambient temperature of the light source.

[0031] Based on this, in various embodiments of this application, a voltage control circuit is provided, and the processor module outputs a control signal to the voltage control circuit, so that the voltage control module controls the power supply chip to output a first voltage to the bias circuit in the visible light communication circuit. The value of the first voltage is determined by the control signal output by the processor module. In this way, when the control signal output by the processor module is different, the first voltage output by the power supply chip to the bias circuit in the visible light communication circuit is also different. This realizes the function of real-time adjustable bias voltage of the light source in the visible light communication circuit, so that the bias circuit in the visible light communication system can be adapted to different light sources, or to different working environments of the same light source, thereby improving the networking flexibility and communication performance of the visible light communication system.

[0032] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0033] Reference Figure 2 This application provides a voltage control circuit 210, including a processor module 211 and a voltage control module 212. The output terminal of the processor module 211 is connected to the input terminal of the voltage control module 212. The output terminal of the voltage control module 212 is connected to a power chip 221 in a visible light communication circuit 220. The power chip 221 is used to supply power to the bias circuit 222 in the transmission channel of the visible light communication circuit 220.

[0034] Here, the processor module 211 outputs a control signal to the voltage control module 212 so that the voltage control module 212 controls the power chip 221 to output a voltage, the voltage value of which is determined by the control signal.

[0035] In practical applications, the processor module 211 configures the DAC circuit inside the voltage control module 212 through a control interface, enabling the voltage control module 212 to output a corresponding voltage to the power supply chip 221, thereby controlling the output voltage of the power supply chip 221. In the visible light communication circuit 220, on the transmission channel, the transmitted downlink signal is output from the baseband unit to the DAC circuit, converted into an analog signal, and then output to the adjustable gain amplifier. The output power of the adjustable gain amplifier is adjusted to the driving power corresponding to different light sources. Finally, after adjustable DC voltage bias, the light source outputs the downlink signal to free space. Here, the processor module 211 can configure the DAC circuit inside the voltage control module 212 within a certain range, thereby making the output voltage of the power supply chip 221 adjustable within the corresponding range, achieving the function of adjustable bias voltage for the light source in the visible light communication system.

[0036] In this embodiment, the processor module 211 configures the DAC circuit inside the voltage control module 212 through a control interface. In one embodiment, the output terminal of the processor module 211 and the input terminal of the voltage control module 212 are connected through an I2C bus. That is, the processor module 211 configures the DAC circuit inside the voltage control module 212 through the I2C bus.

[0037] also, Figure 2 As not shown, the processor module 211 may also obtain the operating parameters of the voltage control module 212 from the voltage control module 212, so as to determine whether to configure the DAC circuit inside the voltage control module 212 based on the obtained operating parameters of the voltage control module 212.

[0038] Reference Figure 3 In one embodiment, the voltage control module 212 includes: a first DAC circuit 2121 and a resistor divider circuit 2122; the output terminal of the processor module 211 is connected to the input terminal of the first DAC circuit 2121, the output terminal of the first DAC circuit 2121 is connected to the power chip 221, and the resistor divider circuit 2122 is connected in parallel with the power chip 221.

[0039] Here, the processor module 211 outputs a control signal to the first DAC circuit 2121. In response to the control signal, the first DAC circuit 2121 outputs a first current to the resistor divider circuit 2122, so that the power chip 221 outputs a first voltage to the bias circuit 222.

[0040] When the visible light communication circuit 220 is connected to different light sources, these different light sources correspond to different bias voltages. In practical applications, based on the bias voltage corresponding to the light source connected to the visible light communication circuit 220, the first DAC circuit 2121 outputs a current to the resistor divider circuit 2122. This current is adjustable. When the magnitude of this current changes, the voltage on the regulator feedback pin (FB, FeedBack) of the power supply chip 221 changes, thereby allowing the voltage output of the regulator of the power supply chip 221 to change according to the current. This makes the voltage output of the regulator of the power supply chip 221 adjustable, thus achieving dynamic adjustment of the bias voltage when facing different light sources. Therefore, here, this current can be understood as the control signal output by the first DAC circuit 2121.

[0041] Reference Figure 4 In one embodiment, the processor module 211 includes a processor chip 2111 and a temperature sensor 2112 connected to the processor chip.

[0042] The processor chip 2111 is used to output a control signal based on the temperature measurement value output by the temperature sensor 2112.

[0043] Here, when the bias voltage of the light source connected to the visible light communication circuit 220 changes with the ambient temperature, it is necessary to dynamically adjust the bias voltage. At this time, combined with... Figure 5 The processor chip 2111 first reads the ambient temperature of the current light source using the temperature sensor 2112, and then calculates the bias voltage value corresponding to the current ambient temperature by reading pre-stored temperature correction parameters. Next, the processor chip 2111 controls the first DAC circuit 2121 to output a current matching the calculated bias voltage value to the resistor divider circuit 2122. This causes a change in the voltage on the regulator feedback pin of the power supply chip 221, allowing the voltage output of the regulator in the power supply chip 221 to change according to this current, thus adjusting the bias voltage to match the current ambient temperature. Similarly, this current can be understood as the control signal output by the first DAC circuit 2121.

[0044] It should be noted that in practical applications, the modules in the above embodiments can be implemented based on chips that can provide the same or similar functions, which will not be described one by one here.

[0045] Reference Figure 5 This application also provides a communication device, including a visible light communication circuit 220 and a voltage control circuit 210.

[0046] The voltage control circuit 210 includes a processor module 211 and a voltage control module 212. The output terminal of the processor module 211 is connected to the input terminal of the voltage control module 212. The output terminal of the voltage control module 212 is connected to the power chip 221 in the visible light communication circuit 220. The power chip 221 is used to supply power to the bias circuit 222 in the transmission channel of the visible light communication circuit 220.

[0047] Here, the processor module 211 outputs a control signal to the voltage control module 212, so that the voltage control module 212 controls the power chip 221 to output a first voltage, the value of which is determined by the control signal.

[0048] In practical applications, the processor module 211 configures the DAC circuit inside the voltage control module 212 through a control interface, enabling the voltage control module 212 to output a corresponding voltage to the power supply chip 221, thereby controlling the output voltage of the power supply chip 221. In the visible light communication circuit 220, on the transmission channel, the transmitted downlink signal is output from the baseband unit to the DAC circuit, converted into an analog signal, and then output to the adjustable gain amplifier. The output power of the adjustable gain amplifier is adjusted to the driving power corresponding to different light sources. Finally, after adjustable DC voltage bias, the light source outputs the downlink signal to free space. Here, the processor module 211 can configure the DAC circuit inside the voltage control module 212 within a certain range, thereby making the output voltage of the power supply chip 221 adjustable within the corresponding range, achieving the function of adjustable bias voltage for the light source in the visible light communication system.

[0049] In this embodiment, the processor module 211 configures the DAC circuit inside the voltage control module 212 through a control interface. In one embodiment, the output terminal of the processor module 211 and the input terminal of the voltage control module 212 are connected through an I2C bus. That is, the processor module 211 configures the DAC circuit inside the voltage control module 212 through the I2C bus.

[0050] In one embodiment, the visible light communication circuit 220 includes: a baseband unit, a transmitting channel, and a receiving channel; the output terminal of the baseband unit is connected to the input terminal of the transmitting channel, the output terminal of the transmitting channel is used to connect to a light source, the input terminal of the baseband unit is connected to the output terminal of the receiving channel, and the input terminal of the receiving channel is used to connect to a photodetector.

[0051] In one embodiment, the transmission channel includes a second DAC circuit, a first amplifier, and a bias circuit 222, wherein the input terminal of the second DAC circuit is connected to the output terminal of the baseband unit, the output terminal of the second DAC circuit is connected to the input terminal of the first amplifier, the output terminal of the first amplifier is connected to the input terminal of the bias circuit 222, and the output terminal of the bias circuit 222 is used to connect to a light source.

[0052] The receiving channel includes a first ADC circuit, a second amplifier, and a DC blocking circuit. The input terminal of the DC blocking circuit is connected to a photodetector, the output terminal of the DC blocking circuit is connected to the input terminal of the second amplifier, the output terminal of the second amplifier is connected to the input terminal of the first ADC circuit, and the output terminal of the first ADC circuit is connected to the input terminal of the baseband unit.

[0053] Reference Figure 3In one embodiment, the voltage control module 212 includes: a first DAC circuit 2121 and a resistor divider circuit 2122; the output terminal of the processor module 211 is connected to the input terminal of the first DAC circuit 2121, the output terminal of the first DAC circuit 2121 is connected to the power chip 221, and the resistor divider circuit 2122 is connected in parallel with the power chip 221.

[0054] Here, the processor module 211 outputs a control signal to the first DAC circuit 2121. In response to the control signal, the first DAC circuit 2121 outputs a first current matching the control signal to the resistor divider circuit 2122, so that the power supply chip 221 outputs a first voltage matching the control signal to the bias circuit 222.

[0055] When the visible light communication circuit 220 is connected to different light sources, these different light sources correspond to different bias voltages. In practical applications, based on the bias voltage corresponding to the light source connected to the visible light communication circuit 220, the first DAC circuit 2121 outputs a current to the resistor divider circuit 2122. This current is adjustable. When the magnitude of this current changes, the voltage on the regulator feedback pin (FB, FeedBack) of the power supply chip 221 changes, thereby allowing the voltage output of the regulator of the power supply chip 221 to change according to the current. This makes the voltage output of the regulator of the power supply chip 221 adjustable, thus achieving dynamic adjustment of the bias voltage when facing different light sources. Therefore, here, this current can be understood as the control signal output by the first DAC circuit 2121.

[0056] In one embodiment, the output of the processor module 211 is connected to the input of the voltage control module 212 via an I2C bus.

[0057] Reference Figure 4 In one embodiment, the processor module 211 includes a processor chip 2111 and a temperature sensor 2112 connected to the processor chip.

[0058] The processor chip 2111 is used to output a control signal based on the temperature measurement value output by the temperature sensor 2112.

[0059] Here, when the bias voltage of the light source connected to the visible light communication circuit 220 changes with the ambient temperature, it is necessary to dynamically adjust the bias voltage. At this time, combined with... Figure 5The processor chip 2111 first reads the ambient temperature of the current light source using the temperature sensor 2112, and then calculates the bias voltage value corresponding to the current ambient temperature by reading pre-stored temperature correction parameters. Next, the processor chip 2111 controls the first DAC circuit 2121 to output a current matching the calculated bias voltage value to the resistor divider circuit 2122. This causes a change in the voltage on the regulator feedback pin of the power supply chip 221, allowing the voltage output of the regulator in the power supply chip 221 to change according to this current, thus adjusting the bias voltage to match the current ambient temperature. Similarly, this current can be understood as the control signal output by the first DAC circuit 2121.

[0060] In the voltage control circuit and communication device provided in this application embodiment, a voltage control circuit is set at the front end of the visible light communication circuit. The processor module outputs a control signal to the voltage control circuit, so that the voltage control module controls the power supply chip to output a first voltage to the bias circuit in the transmission channel of the visible light communication circuit. The voltage value of the first voltage is determined by the control signal output by the processor module. In this way, when the control signal output by the processor module is different, the first voltage output by the power supply chip to the bias circuit in the visible light communication circuit is also different. This realizes the function of real-time adjustable bias voltage of the light source in the visible light communication circuit, so that the bias circuit in the visible light communication system can be adapted to different light sources or to different working environments of the same light source, thereby improving the networking flexibility and communication performance of the visible light communication system.

[0061] Furthermore, it should be noted that the embodiments of this application are applicable not only to scenarios with downlink visible light sources, but also to scenarios with uplink infrared light sources.

[0062] It should be noted that terms such as "first" and "second" are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0063] Furthermore, the technical solutions described in the embodiments of this application can be combined arbitrarily without conflict.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application.

Claims

1. A voltage control circuit, characterized in that, include: A processor module and a voltage control module; the output terminal of the processor module is connected to the input terminal of the voltage control module; The output of the voltage control module is connected to the power supply chip in the visible light communication circuit. The power supply chip is used to supply power to the bias circuit in the transmission channel of the visible light communication circuit. The processor module outputs a control signal to the voltage control module, so that the voltage control module controls the power chip to output a first voltage, the value of which is determined by the control signal.

2. The voltage control circuit according to claim 1, characterized in that, The voltage control module includes: a first digital-to-analog converter circuit and a resistor voltage divider circuit; the output terminal of the processor module is connected to the input terminal of the first digital-to-analog converter circuit, the output terminal of the first digital-to-analog converter circuit is connected to the power supply chip, and the resistor voltage divider circuit is connected in parallel with the power supply chip; wherein... The processor module outputs the control signal to the first digital-to-analog converter circuit, and the first digital-to-analog converter circuit responds to the control signal by outputting a first current to the resistor divider circuit, so that the power chip outputs the first voltage to the bias circuit.

3. The voltage control circuit according to claim 1, characterized in that, The output of the processor module is connected to the input of the voltage control module via an I2C bus.

4. The voltage control circuit according to claim 1, characterized in that, The processor module includes: a processor chip and a temperature sensor connected to the processor chip; wherein... The processor chip is used to output the control signal based on the temperature measurement value output by the temperature sensor.

5. A communication device, characterized in that, include: A visible light communication circuit and a voltage control circuit are disclosed. The voltage control circuit includes a processor module and a voltage control module. The output terminal of the processor module is connected to the input terminal of the voltage control module. The output terminal of the voltage control module is connected to a power supply chip in the visible light communication circuit. The power supply chip is used to supply power to the bias circuit in the transmission channel of the visible light communication circuit. The processor module outputs a control signal to the voltage control module, so that the voltage control module controls the power chip to output a first voltage, the value of which is determined by the control signal.

6. The communication device according to claim 5, characterized in that, The voltage control module includes: a first digital-to-analog converter circuit and a resistor voltage divider circuit; the output terminal of the processor module is connected to the input terminal of the first digital-to-analog converter circuit, the output terminal of the first digital-to-analog converter circuit is connected to the power supply chip, and the resistor voltage divider circuit is connected in parallel with the power supply chip; wherein... The processor module outputs the control signal to the first digital-to-analog converter circuit, and the first digital-to-analog converter circuit responds to the control signal by outputting a first current to the resistor divider circuit, so that the power chip outputs the first voltage to the bias circuit.

7. The communication device according to claim 5, characterized in that, The output of the processor module is connected to the input of the voltage control module via an I2C bus.

8. The communication device according to claim 5, characterized in that, The processor module includes: a processor chip and a temperature sensor connected to the processor chip; wherein... The processor chip is used to output the control signal based on the temperature measurement value output by the temperature sensor.

9. The communication device according to any one of claims 5 to 8, characterized in that, The visible light communication circuit includes: a baseband unit, a transmitting channel, and a receiving channel; the output terminal of the baseband unit is connected to the input terminal of the transmitting channel, the output terminal of the transmitting channel is used to connect to a light source, the input terminal of the baseband unit is connected to the output terminal of the receiving channel, and the input terminal of the receiving channel is used to connect to a photodetector.

10. The communication device according to claim 9, characterized in that, The transmission channel includes: a second digital-to-analog converter circuit, a first amplifier, and a bias circuit. The input terminal of the second digital-to-analog converter circuit is connected to the output terminal of the baseband unit, the output terminal of the second digital-to-analog converter circuit is connected to the input terminal of the first amplifier, the output terminal of the first amplifier is connected to the input terminal of the bias circuit, and the output terminal of the bias circuit is used to connect to a light source. The receiving channel includes: a first analog-to-digital converter circuit, a second amplifier, and a DC blocking circuit. The input terminal of the DC blocking circuit is connected to a photodetector, the output terminal of the DC blocking circuit is connected to the input terminal of the second amplifier, the output terminal of the second amplifier is connected to the input terminal of the first analog-to-digital converter circuit, and the output terminal of the first analog-to-digital converter circuit is connected to the input terminal of the baseband unit.

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