Visible light illumination and communication integrated lamp driving system

Abstract

The invention discloses a visible light illumination and communication integrated lamp driving system, which comprises a signal acquisition unit, a control unit, a driving unit, a light source unit and a signal receiving unit, wherein the signal acquisition unit is used for receiving an external optical signal; the control unit is used for modulating and coding the external light signal and outputting a visible light modulation signal; the driving unit is used for driving the light source unit to illuminate according to the visible light modulation signal and sending a visible light signal; the signal receiving unit is used for receiving a user optical signal and carrying out amplification demodulation processing so as to realize communication with a user; wherein the user light signal is sent after a user receives a visible light signal sent by the light source unit. According to the invention, light transmission of information can be realized while illumination is provided.

Description

Technical Field

[0001] The present invention belongs to the field of visible light lighting communication, and in particular relates to a lamp driving system integrating visible light lighting communication. Background Art

[0002] At present, compared with traditional light sources, LED lighting (light emitting diode) has the characteristics of being green and environmentally friendly, small in size, low in power consumption, and long in life, making it very suitable for use as a light source for lamps. The basic structure of a traditional LED light source module includes: an LED light source module and an LED light source driver module. At present, radio communication and its applications have become the most active research field in today's information technology. However, most radio communication technologies are limited by the influence of transmission power and electromagnetic interference, and cannot be used in special occasions such as coal mine safety production, medical monitoring, and marine exploration. Visible light communication is not affected by complex electromagnetic interference and is a communication technology that has re-emerged in recent years. LED light sources have the characteristics of high response sensitivity and good modulation characteristics, making them very suitable as visible light communication light sources. Therefore, it is very necessary to develop a lamp driving system that integrates visible light lighting and communication, which can realize optical transmission of information while providing lighting. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a lamp driving system integrating visible light illumination and communication. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0004] A visible light lighting communication integrated lamp driving system includes: a signal acquisition unit, a control unit, a driving unit, a light source unit and a signal receiving unit; wherein,

[0005] The signal acquisition unit is used to receive external optical signals;

[0006] The control unit is configured to modulate the external optical signal and output a visible light modulated signal;

[0007] The driving unit is configured to drive the light source unit to illuminate and send a visible light signal at the same time according to the visible light modulation signal;

[0008] The signal receiving unit is used to receive the user optical signal and perform amplification and demodulation processing to achieve communication with the user; wherein, the user optical signal is emitted by the user equipment after receiving the visible light signal emitted by the light source unit.

[0009] In one embodiment of the present invention, the driving unit includes:

[0010] Optocoupler isolator, high-speed MOSFET driver, high-speed MOSFET power tube, current limiting resistor, LED driver and switch energy storage capacitor; Among them,

[0011] The input end of the optocoupler isolator serves as the input end of the driving unit to receive the visible light modulation signal, and the output end of the optocoupler isolator is connected to the input end of the high-speed MOSFET driver;

[0012] The output end of the high-speed MOSFET driver is connected to the gate of the high-speed MOSFET power tube;

[0013] The drain of the high-speed MOSFET power tube is connected to the first end of the light source unit, and the source of the high-speed MOSFET power tube is connected to the first end of the current-limiting resistor;

[0014] The second end of the current limiting resistor is grounded;

[0015] The first end of the switch energy storage capacitor is connected to the second end of the light source unit and the positive terminal of the LED driver;

[0016] The second end of the switch energy storage capacitor is connected to the second end of the current limiting resistor and the negative terminal of the LED driver.

[0017] In one embodiment of the present invention, the light source unit is composed of a series-parallel combination of white light LED devices that meet high power requirements.

[0018] In one embodiment of the present invention, the light source unit includes at least two LED branches connected in parallel, and each LED branch includes a plurality of white light LED diodes connected in series.

[0019] In one embodiment of the present invention, the user optical signal includes an infrared light signal.

[0020] In one embodiment of the present invention, the signal receiving unit includes:

[0021] Photodiode, transimpedance amplifier module, single-ended to differential module, digitally controlled variable gain amplifier module, differential to single-ended module, demodulation module and filtering module, among which,

[0022] The photodiode is used to convert the user optical signal into photoelectric conversion and output photocurrent;

[0023] The transimpedance amplification module is used to convert the photocurrent into a voltage signal and amplify it;

[0024] The single-ended to differential conversion module is used to amplify the single-ended voltage signal output by the transimpedance amplifier module and convert it into a differential signal;

[0025] The digitally controlled variable gain amplifier module is used to dynamically amplify the differential signal output by the single-ended to differential conversion module and control the amplification gain to achieve an automatic gain control function for visible light;

[0026] The differential-to-single-ended module is used to convert the differential signal output by the digitally controlled variable gain amplifier module into a single-ended signal;

[0027] The demodulation module is used to demodulate the single-ended signal output by the differential-to-single-ended module and output a demodulated signal;

[0028] The filtering module is used to filter out high-frequency components and low-frequency components in the demodulated signal.

[0029] In one embodiment of the present invention, the transimpedance amplification module includes:

[0030] Resistor R1, capacitor C1 and amplifier chip U1; among them,

[0031] Pin IN- of the amplifier chip U1 is connected to the cathode of the photodiode, the first end of the resistor R1, and the first end of the capacitor C1;

[0032] The second end of the resistor R1 and the second end of the capacitor C1 are connected to the pin Vout of the amplifier chip U1, and the pin Vout of the amplifier chip U1 serves as the output end of the transimpedance amplification module;

[0033] The pin IN+ of the amplifier chip U1 is grounded;

[0034] The power pin V+ of the amplifier chip U1 is connected to a +5V voltage source; the power pin V- of the amplifier chip U1 is connected to a -5V voltage source.

[0035] In one embodiment of the present invention, the single-ended to differential conversion module includes:

[0036] Resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, capacitor C2, capacitor C3, capacitor C4, capacitor C5 and amplifier chip U2; wherein,

[0037] The output end of the transimpedance amplification module is connected to the IN+ pin of the amplifier chip U2 through the capacitor C2 and the resistor R2; the IN- pin of the amplifier chip U2 is grounded through the resistor R3 and the capacitor C3;

[0038] The first ends of the resistor R4 and the capacitor C4 are connected to the pin IN+ of the amplifier chip U2, and the second ends are connected to the pin FB- of the amplifier chip U2;

[0039] The first ends of the resistor R5 and the capacitor C5 are connected to the pin IN- of the amplifier chip U2, and the second ends are connected to the pin FB+ of the amplifier chip U2;

[0040] The first ends of the resistors R6 and R7 are connected to the pin VCOM of the amplifier chip U2, the second end of the resistor R6 is grounded, and the second end of the resistor R7 is connected to a +5V voltage source;

[0041] The power pin V+ of the amplifier chip U2 is connected to a +5V voltage source; the power pin V- of the amplifier chip U2 is grounded;

[0042] The pins FB- and FB+ of the amplifier chip U2 serve as differential output terminals of the single-ended to differential converter module.

[0043] In one embodiment of the present invention, the digitally controlled variable gain amplifier module includes:

[0044] Resistor R8, resistor R9, resistor R10, capacitor C6, capacitor C7, capacitor C8 and amplifier chip U3; wherein,

[0045] The INLO and INHI pins of the amplifier chip U3 respectively receive signals output from the differential output end of the single-ended to differential module;

[0046] The first ends of the resistors R8, R9 and R10 are respectively connected to the DATA, CLCK and LTCH pins of the amplifier chip U3, and the second ends are connected to the control unit to receive serial data;

[0047] Pins OPLO and OPHI of the amplifier chip U3 are connected to the subsequent circuit as output pins;

[0048] The pins VCCI, VCC0, and PWUP of the amplifier chip U3 are connected to a +3.3V voltage source;

[0049] Pins ICOM and OCOM of the amplifier chip U3 are grounded;

[0050] The pin VOCM of the amplifier chip U3 is connected to ground via the capacitor C6;

[0051] The capacitor C7 and the capacitor C8 are respectively connected to the pin VCC0 and the pin OCOM of the amplifier chip U3.

[0052] In one embodiment of the present invention, the differential-to-single-ended module includes:

[0053] Resistor R11, resistor R12, resistor R13, resistor R14, capacitor C9 and amplifier chip U4; wherein,

[0054] The first end of the resistor R11 is connected to the pin OPLO of the amplifier chip U3 in the digitally controlled variable gain amplifier module, and the second end of the resistor R11 is connected to the pin IN- of the amplifier chip U4; the pin IN- of the amplifier chip U4 is also connected to the first end of the capacitor C9 and the first end of the resistor R13;

[0055] The first end of the resistor R12 is connected to the pin OPHI of the amplifier chip U3 in the digitally controlled variable gain amplifier module, and the second end of the resistor R12 is connected to the pin IN+ of the amplifier chip U4; the pin IN+ of the amplifier chip U4 is also connected to the first end of the resistor R14, and the second end of the resistor R14 is grounded;

[0056] The second ends of the capacitor C9 and the resistor R13 are connected to the pin Vout of the amplifier chip U4;

[0057] The power pin V+ of the amplifier chip U4 is connected to a +5V voltage source; the power pin V- of the amplifier chip U4 is connected to a -5V voltage source.

[0058] Beneficial effects of the present invention:

[0059] The integrated visible light illumination and communication lamp driving system provided by the embodiments of the present invention collects and modulates external optical signals, driving the light source unit to illuminate and simultaneously transmit visible light signals. Upon receiving the user optical signal, the system amplifies and demodulates it, thereby enabling the transmission and reception of visible light signals within the integrated visible light illumination and communication lamp driving system, enabling both illumination and optical information transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 A schematic structural diagram of a visible light lighting and communication integrated lamp driving system provided by an embodiment of the present invention;

[0061] Figure 2 Schematic diagram of the visible light communication signal electrical / optical conversion process performed by the driving unit and the light source unit in an embodiment of the present invention;

[0062] Figure 3 is a structural diagram of a signal receiving unit in an embodiment of the present invention;

[0063] Figure 4 This is a circuit diagram of a signal receiving unit in an embodiment of the present invention. DETAILED DESCRIPTION

[0064] The present invention will be further described in detail below with reference to specific examples, but the embodiments of the present invention are not limited thereto.

[0065] The embodiment of the present invention provides a visible light lighting communication integrated lamp driving system, such as Figure 1 As shown, the system may include:

[0066] Signal acquisition unit, control unit, drive unit, light source unit and signal receiving unit; wherein,

[0067] The signal acquisition unit is used to receive external optical signals;

[0068] The control unit is configured to modulate the external optical signal and output a visible light modulated signal;

[0069] The driving unit is configured to drive the light source unit to illuminate and send a visible light signal at the same time according to the visible light modulation signal;

[0070] The signal receiving unit is used to receive the user optical signal and perform amplification and demodulation processing to achieve communication with the user; wherein, the user optical signal is emitted by the user equipment after receiving the visible light signal emitted by the light source unit.

[0071] Among them, the visible light lighting and communication integrated lamp driving system can be set as a whole at a common lamp installation location, for example, it can be set as a street lamp equipment on a street lamp pole, or as an indoor ceiling light equipment, it can be set on the indoor ceiling. The specific location can be set according to needs and is not limited.

[0072] Alternatively, the light source unit in the visible light lighting and communication integrated lamp driving system can be set at a common lamp installation position, and the remaining components can be set at other positions near the light source unit, such as on the ground, as long as the above-mentioned units meet the required communication connection relationship.

[0073] Among them, the signal acquisition unit, control unit, drive unit, and light source unit are connected in sequence. These parts together constitute the transmitting end of the visible light lighting and communication integrated lamp driving system, which is used to drive the light source unit to illuminate after processing based on the external light signal, and at the same time emit visible light signals in the form of bright and dark light to carry certain communication information.

[0074] Specifically, the signal acquisition unit receives an external optical signal, which may be a visible light signal emitted by an external device other than the user device, and the external optical signal itself may carry information instructions. The signal acquisition unit can be implemented using any existing device for receiving optical signals, and this is not limited here.

[0075] The control unit can use any existing modulation method to modulate the received external light signal and output a visible light modulated signal. The modulation process can also be understood as an encoding process. For example, the visible light modulated signal can be a signal composed of 0101, etc.

[0076] After receiving the visible light modulation signal and performing corresponding processing, the driving unit drives the light source unit to emit light in the form of light and dark. While performing illumination, it can realize the electrical / optical conversion of the visible light communication signal and send out a visible light signal, which is the visible light communication signal sent by the sending end.

[0077] In an optional embodiment, the light source unit is composed of a series-parallel combination of white light LED devices that meet high power requirements.

[0078] As an example, the light source unit includes at least two LED branches connected in parallel, and each LED branch includes a plurality of white light LED diodes connected in series.

[0079] In the embodiment of the present invention, the structure of the driving unit is shown in Figure 2 As shown, the driving unit includes:

[0080] Optocoupler isolator, high-speed MOSFET driver, high-speed MOSFET power tube, current limiting resistor, LED driver and switch energy storage capacitor; Among them,

[0081] The input end of the optocoupler isolator serves as the input end of the driving unit to receive the visible light modulation signal, and the output end of the optocoupler isolator is connected to the input end of the high-speed MOSFET driver;

[0082] The output end of the high-speed MOSFET driver is connected to the gate of the high-speed MOSFET power tube;

[0083] The drain of the high-speed MOSFET power tube is connected to the first end of the light source unit, and the source of the high-speed MOSFET power tube is connected to the first end of the current-limiting resistor;

[0084] The second end of the current limiting resistor is grounded;

[0085] The first end of the switch energy storage capacitor is connected to the second end of the light source unit and the positive terminal of the LED driver;

[0086] The second end of the switch energy storage capacitor is connected to the second end of the current limiting resistor and the negative terminal of the LED driver.

[0087] See also Figure 2, which represents the process of electrical / optical conversion of visible light communication signals. The LED lamp group is an example of the light source unit, including multiple LED branches connected in parallel, each LED branch including multiple visible light LED diodes connected in series. The LED driver is a constant voltage driver.

[0088] The visible light modulation signal is connected to the input of a high-speed MOSFET driver via an optocoupler isolator. Through current drive, the output signal is applied to the gate of the high-speed MOSFET power tube, controlling its rapid on / off switching. A current-limiting resistor is connected to the source of the high-speed MOSFET power tube to determine the peak-to-peak value of the visible light LED current. By controlling the gate voltage of the high-speed MOSFET power tube, the current flowing through the visible light LED is controlled, converting the high-speed voltage signal into a high-speed current signal. Through the driver unit, the light source unit can emit light in a bright and dimming manner, emitting visible light signals for communication in the form of flashes.

[0089] Among them, the interference noise generated by the driving unit controlling the high-speed switching of a large current can easily cause other unit circuits to malfunction. The signal isolation circuit uses an optocoupler isolation circuit to avoid noise interference while transmitting signals.

[0090] In the embodiment of the present invention, the optocoupler isolator, high-speed MOSFET driver, high-speed MOSFET power tube, current limiting resistor, LED driver and switch energy storage capacitor can all be implemented using existing devices and are not limited here.

[0091] After the light source unit emits a visible light signal, the user device can receive the visible light signal, perform certain processing, and then emit a user light signal for communication response. The user light signal is also a visible light signal. For example, in an optional embodiment, the user light signal includes an infrared light signal.

[0092] The user optical signal sent by the user equipment is received by the signal receiving unit of the visible light lighting communication integrated lamp driving system.

[0093] In an optional implementation manner, the signal receiving unit includes:

[0094] Photodiode, transimpedance amplifier module, single-ended to differential module, digitally controlled variable gain amplifier module, differential to single-ended module, demodulation module and filtering module, among which,

[0095] The photodiode is used to convert the user optical signal into photoelectric conversion and output photocurrent;

[0096] The transimpedance amplification module is used to convert the photocurrent into a voltage signal and amplify it;

[0097] The single-ended to differential conversion module is used to amplify the single-ended voltage signal output by the transimpedance amplifier module and convert it into a differential signal;

[0098] The digitally controlled variable gain amplifier module is used to dynamically amplify the differential signal output by the single-ended to differential conversion module and control the amplification gain to achieve an automatic gain control function for visible light;

[0099] The differential-to-single-ended module is used to convert the differential signal output by the digitally controlled variable gain amplifier module into a single-ended signal;

[0100] The demodulation module is used to demodulate the single-ended signal output by the differential-to-single-ended module and output a demodulated signal;

[0101] The filtering module is used to filter out high-frequency components and low-frequency components in the demodulated signal.

[0102] See Figure 3 , Figure 3 Schematic diagram of the structure of the signal receiving unit.

[0103] A photodiode is connected before the transimpedance amplifier. After receiving the user's optical signal, it performs photoelectric conversion and outputs a photocurrent. The photodiode can be implemented using existing devices, such as high-speed photodiodes.

[0104] The transimpedance amplification module converts the photocurrent into a voltage signal and amplifies it. The single-ended to differential conversion module then further amplifies the single-ended voltage signal output by the transimpedance amplification module and converts it into a differential signal. Differential signal transmission effectively eliminates common-mode noise interference. The digitally controlled variable gain amplification module dynamically amplifies the input differential signal and controls the amplification gain based on the signal detection results, thereby enabling the system to automatically adjust the gain of visible light at different distances and thus adjust the system's communication distance. The differential to single-ended conversion module further amplifies the differential signal output by the digitally controlled variable gain amplification module and converts it back into a single-ended signal, outputting it to the demodulation module. The demodulation module demodulates the input single-ended signal and outputs a demodulated signal. The filtering module filters out the high-frequency and low-frequency components in the demodulated signal to obtain the communication information carried by the user optical signal. This information can also be in the form of a signal such as 0101 to represent different communication content.

[0105] The demodulation module and the filtering module can be implemented using existing devices.

[0106] As an alternative implementation, see Figure 4 , Figure 4 A circuit diagram of the signal receiving unit.

[0107] Figure 4 The photodiode D1 in the figure has its positive electrode connected to a -8V voltage source (VCC_-8V), and its negative electrode connected to the first-stage transimpedance amplifier circuit, i.e., the transimpedance amplifier module. When the photodiode D1 receives a visible light signal on its light-sensing surface under reverse voltage, it converts the visible light signal into a current signal I S Output. I S The photocurrent is generally too weak to be directly decoded. The transimpedance amplifier module connected after photodiode D1 is a preamplifier. Its function is to amplify the weak photocurrent for subsequent amplification and processing by the next-stage amplifier. However, while amplifying, the preamplifier also introduces thermal noise from its own resistance and shot noise from the transistors. This noise is amplified in the next-stage amplifier, significantly impacting system performance. Therefore, the preamplifier must be specially designed to have low noise, high gain, and a wide bandwidth, thereby enabling the signal receiving unit to achieve a high signal-to-noise ratio. Transimpedance amplifiers offer the advantages of a wide dynamic range, low noise, and high sensitivity, making them suitable for use in high-speed optical communication systems.

[0108] like Figure 4 As shown, the transimpedance amplification module includes:

[0109] Resistor R1, capacitor C1 and amplifier chip U1; among them,

[0110] Pin IN- of the amplifier chip U1 is connected to the cathode of the photodiode, the first end of the resistor R1, and the first end of the capacitor C1;

[0111] The second end of the resistor R1 and the second end of the capacitor C1 are connected to the pin Vout of the amplifier chip U1, and the pin Vout of the amplifier chip U1 serves as the output end of the transimpedance amplification module;

[0112] The pin IN+ of the amplifier chip U1 is grounded;

[0113] The power pin V+ of the amplifier chip U1 is connected to a +5V voltage source; the power pin V- of the amplifier chip U1 is connected to a -5V voltage source.

[0114] Figure 4 The input terminals of the amplifier chip U1 are marked with + and - as pins IN+ and IN-, respectively. The model of the amplifier chip U1 may be AD8001.

[0115] The first-stage transimpedance amplifier circuit converts the current signal I output by the photodiode into S Amplified to the first voltage signal V S1And output to the second stage amplifier circuit. The first voltage signal V S1 The calculation formula is: V S1 =R1*I S The time response of this circuit is largely determined by the time constant of the feedback resistor R1 and its parallel stray capacitance. To minimize the effect of this time constant, two or more resistors can be connected in series or a T-type feedback network can be used to distribute the parallel stray capacitance.

[0116] Figure 4 The second-stage amplifier circuit, namely the second-stage single-ended to differential amplifier circuit, is the single-ended to differential module mentioned above.

[0117] The single-ended to differential module includes:

[0118] Resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, capacitor C2, capacitor C3, capacitor C4, capacitor C5 and amplifier chip U2; wherein,

[0119] The output end of the transimpedance amplification module is connected to the IN+ pin of the amplifier chip U2 through the capacitor C2 and the resistor R2; the IN- pin of the amplifier chip U2 is grounded through the resistor R3 and the capacitor C3;

[0120] The first ends of the resistor R4 and the capacitor C4 are connected to the pin IN+ of the amplifier chip U2, and the second ends are connected to the pin FB- of the amplifier chip U2;

[0121] The first ends of the resistor R5 and the capacitor C5 are connected to the pin IN- of the amplifier chip U2, and the second ends are connected to the pin FB+ of the amplifier chip U2;

[0122] The first ends of the resistors R6 and R7 are connected to the pin VCOM of the amplifier chip U2, the second end of the resistor R6 is grounded, and the second end of the resistor R7 is connected to a +5V voltage source;

[0123] The power pin V+ of the amplifier chip U2 is connected to a +5V voltage source; the power pin V- of the amplifier chip U2 is grounded;

[0124] The pins FB- and FB+ of the amplifier chip U2 serve as differential output terminals of the single-ended to differential converter module.

[0125] Among them, the following requirements are met:

[0126] R2=R3;

[0127] R4=R5;

[0128]

[0129] R6=R7;

[0130]

[0131] V OUT,dm is the differential output voltage after chip U2 amplification, V IN,dm is the differential input voltage of chip U2, V OCM is the output common-mode voltage.

[0132] See also Figure 4 The third-stage programmable amplifier circuit is the digitally controlled variable gain amplifier module.

[0133] This can include:

[0134] Resistor R8, resistor R9, resistor R10, capacitor C6, capacitor C7, capacitor C8 and amplifier chip U3; wherein,

[0135] The INLO and INHI pins of the amplifier chip U3 respectively receive signals output from the differential output end of the single-ended to differential module;

[0136] The first ends of the resistors R8, R9 and R10 are respectively connected to the DATA, CLCK and LTCH pins of the amplifier chip U3, and the second ends are connected to the control unit to receive serial data;

[0137] Pins OPLO and OPHI of the amplifier chip U3 are connected to the subsequent circuit as output pins;

[0138] The pins VCCI, VCC0, and PWUP of the amplifier chip U3 are connected to a +3.3V voltage source;

[0139] Pins ICOM and OCOM of the amplifier chip U3 are grounded;

[0140] The pin VOCM of the amplifier chip U3 is connected to ground via the capacitor C6;

[0141] The capacitor C7 and the capacitor C8 are respectively connected to the pin VCC0 and the pin OCOM of the amplifier chip U3.

[0142] Pins FB- and FB+ of amplifier chip U2 are connected to the INLO and INHI pins of amplifier chip U3 via capacitors C10 and C11, respectively. The DATA, CLCK, and LTCH pins of amplifier chip U3 are digital control ports using a standard TTL interface. Amplifier chip U3 provides two gain control ranges, controlled via a three-wire digital interface, enabling fine-tuning of gain control for higher receiver sensitivity.

[0143] See also Figure 4 The fourth-stage differential-to-single-ended amplifier circuit, namely the differential-to-single-ended module, specifically includes:

[0144] Resistor R11, resistor R12, resistor R13, resistor R14, capacitor C9 and amplifier chip U4; wherein,

[0145] The first end of the resistor R11 is connected to the pin OPLO of the amplifier chip U3 in the digitally controlled variable gain amplifier module, and the second end of the resistor R11 is connected to the pin IN- of the amplifier chip U4; the pin IN- of the amplifier chip U4 is also connected to the first end of the capacitor C9 and the first end of the resistor R13;

[0146] The first end of the resistor R12 is connected to the pin OPHI of the amplifier chip U3 in the digitally controlled variable gain amplifier module, and the second end of the resistor R12 is connected to the pin IN+ of the amplifier chip U4; the pin IN+ of the amplifier chip U4 is also connected to the first end of the resistor R14, and the second end of the resistor R14 is grounded;

[0147] The second ends of the capacitor C9 and the resistor R13 are connected to the pin Vout of the amplifier chip U4;

[0148] The power pin V+ of the amplifier chip U4 is connected to a +5V voltage source; the power pin V- of the amplifier chip U4 is connected to a -5V voltage source.

[0149] The third-stage programmable amplifier circuit outputs the signal V OUTP , V OUTN As the input signal of the fourth stage differential to single-ended amplifier circuit. The output signal V OUT Expressed as:

[0150]

[0151] Among them, V OUT1 and V OUT2 is a differential voltage signal.

[0152] when When V OUT =V OUTP -V OUTN .

[0153] The fourth-stage differential-to-single-ended amplifier circuit amplifies the difference between the applied input voltages. It is a combination of an inverting and a non-inverting amplifier, using negative feedback to control the output gain. The gain depends on the ratio of the input resistors. Therefore, the amplifier's gain can be precisely controlled by selecting the input resistors. While this circuit ideally has zero common-mode gain, due to mismatched resistor values in practice, the common-mode voltage is very small, resulting in limited common-mode gain.

[0154] in addition, Figure 4 The fourth-stage differential-to-single-ended amplifier circuit is also connected to a resistor R15 and a signal acquisition unit.

[0155] The integrated visible light illumination and communication lamp driving system provided by the embodiments of the present invention collects and modulates external optical signals, driving the light source unit to illuminate and simultaneously transmit visible light signals. Upon receiving the user optical signal, the system amplifies and demodulates it, thereby enabling the transmission and reception of visible light signals within the integrated visible light illumination and communication lamp driving system, enabling both illumination and optical information transmission.

[0156] It should be noted that, in the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0157] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0158] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included in the scope of protection of the present invention.

Claims

1. A visible light lighting and communication integrated lamp driving system, characterized in that: include: Signal acquisition unit, control unit, drive unit, light source unit and signal receiving unit; wherein, The signal acquisition unit is used to receive external optical signals; The control unit is configured to modulate the external optical signal and output a visible light modulated signal; The driving unit is configured to drive the light source unit to illuminate and send a visible light signal at the same time according to the visible light modulation signal; The signal receiving unit is used to receive the user optical signal and perform amplification and demodulation processing to achieve communication with the user; wherein, the user optical signal is emitted by the user equipment after receiving the visible light signal emitted by the light source unit.

2. The visible light lighting and communication integrated lamp driving system according to claim 1, characterized in that: The driving unit includes: Optocoupler isolator, high-speed MOSFET driver, high-speed MOSFET power tube, current limiting resistor, LED driver and switch energy storage capacitor; Among them, The input end of the optocoupler isolator serves as the input end of the driving unit to receive the visible light modulation signal, and the output end of the optocoupler isolator is connected to the input end of the high-speed MOSFET driver; The output end of the high-speed MOSFET driver is connected to the gate of the high-speed MOSFET power tube; The drain of the high-speed MOSFET power tube is connected to the first end of the light source unit, and the source of the high-speed MOSFET power tube is connected to the first end of the current-limiting resistor; The second end of the current limiting resistor is grounded; The first end of the switch energy storage capacitor is connected to the second end of the light source unit and the positive terminal of the LED driver; The second end of the switch energy storage capacitor is connected to the second end of the current limiting resistor and the negative terminal of the LED driver.

3. The visible light lighting and communication integrated lamp driving system according to claim 1, characterized in that: The light source unit is composed of a series-parallel combination of white light LED devices that meet high power requirements.

4. The visible light lighting and communication integrated lamp driving system according to claim 3, characterized in that: The light source unit includes at least two LED branches connected in parallel, and each LED branch includes a plurality of white light LED diodes connected in series.

5. The visible light lighting and communication integrated lamp driving system according to claim 1, characterized in that: The user optical signal includes an infrared optical signal.

6. The visible light lighting and communication integrated lamp driving system according to claim 1, characterized in that: The signal receiving unit includes: Photodiode, transimpedance amplifier module, single-ended to differential module, digitally controlled variable gain amplifier module, differential to single-ended module, demodulation module and filtering module, among which, The photodiode is used to convert the user optical signal into photoelectric conversion and output photocurrent; The transimpedance amplification module is used to convert the photocurrent into a voltage signal and amplify it; The single-ended to differential conversion module is used to amplify the single-ended voltage signal output by the transimpedance amplifier module and convert it into a differential signal; The digitally controlled variable gain amplifier module is used to dynamically amplify the differential signal output by the single-ended to differential conversion module and control the amplification gain to achieve an automatic gain control function for visible light; The differential-to-single-ended module is used to convert the differential signal output by the digitally controlled variable gain amplifier module into a single-ended signal; The demodulation module is used to demodulate the single-ended signal output by the differential-to-single-ended module and output a demodulated signal; The filtering module is used to filter out high-frequency components and low-frequency components in the demodulated signal.

7. The visible light lighting and communication integrated lamp driving system according to claim 6, characterized in that: The transimpedance amplification module includes: Resistor R1, capacitor C1 and amplifier chip U1; among them, Pin IN- of the amplifier chip U1 is connected to the cathode of the photodiode, the first end of the resistor R1, and the first end of the capacitor C1; The second end of the resistor R1 and the second end of the capacitor C1 are connected to the pin Vout of the amplifier chip U1, and the pin Vout of the amplifier chip U1 serves as the output end of the transimpedance amplification module; The pin IN+ of the amplifier chip U1 is grounded; The power pin V+ of the amplifier chip U1 is connected to a +5V voltage source; the power pin V- of the amplifier chip U1 is connected to a -5V voltage source.

8. The visible light lighting and communication integrated lamp driving system according to claim 6, characterized in that: The single-ended to differential module includes: Resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, capacitor C2, capacitor C3, capacitor C4, capacitor C5 and amplifier chip U2; wherein, The output end of the transimpedance amplification module is connected to the IN+ pin of the amplifier chip U2 through the capacitor C2 and the resistor R2; the IN- pin of the amplifier chip U2 is grounded through the resistor R3 and the capacitor C3; The first ends of the resistor R4 and the capacitor C4 are connected to the pin IN+ of the amplifier chip U2, and the second ends are connected to the pin FB- of the amplifier chip U2; The first ends of the resistor R5 and the capacitor C5 are connected to the pin IN- of the amplifier chip U2, and the second ends are connected to the pin FB+ of the amplifier chip U2; The first ends of the resistors R6 and R7 are connected to the pin VCOM of the amplifier chip U2, the second end of the resistor R6 is grounded, and the second end of the resistor R7 is connected to a +5V voltage source; The power pin V+ of the amplifier chip U2 is connected to a +5V voltage source; the power pin V- of the amplifier chip U2 is grounded; The pins FB- and FB+ of the amplifier chip U2 serve as differential output terminals of the single-ended to differential converter module.

9. The visible light lighting and communication integrated lamp driving system according to claim 6, characterized in that: The digitally controlled variable gain amplifier module comprises: Resistor R8, resistor R9, resistor R10, capacitor C6, capacitor C7, capacitor C8 and amplifier chip U3; wherein, The INLO and INHI pins of the amplifier chip U3 respectively receive signals output from the differential output end of the single-ended to differential module; The first ends of the resistors R8, R9 and R10 are respectively connected to the DATA, CLCK and LTCH pins of the amplifier chip U3, and the second ends are connected to the control unit to receive serial data; Pins OPLO and OPHI of the amplifier chip U3 are connected to the subsequent circuit as output pins; The pins VCCI, VCC0, and PWUP of the amplifier chip U3 are connected to a +3.3V voltage source; Pins ICOM and OCOM of the amplifier chip U3 are grounded; The pin VOCM of the amplifier chip U3 is connected to ground via the capacitor C6; The capacitor C7 and the capacitor C8 are respectively connected to the pin VCC0 and the pin OCOM of the amplifier chip U3.

10. The visible light lighting and communication integrated lamp driving system according to claim 9, characterized in that: The differential to single-ended module includes: Resistor R11, resistor R12, resistor R13, resistor R14, capacitor C9 and amplifier chip U4; wherein, The first end of the resistor R11 is connected to the pin OPLO of the amplifier chip U3 in the digitally controlled variable gain amplifier module, and the second end of the resistor R11 is connected to the pin IN- of the amplifier chip U4; the pin IN- of the amplifier chip U4 is also connected to the first end of the capacitor C9 and the first end of the resistor R13; The first end of the resistor R12 is connected to the pin OPHI of the amplifier chip U3 in the digitally controlled variable gain amplifier module, and the second end of the resistor R12 is connected to the pin IN+ of the amplifier chip U4; the pin IN+ of the amplifier chip U4 is also connected to the first end of the resistor R14, and the second end of the resistor R14 is grounded; The second ends of the capacitor C9 and the resistor R13 are connected to the pin Vout of the amplifier chip U4; The power pin V+ of the amplifier chip U4 is connected to a +5V voltage source; the power pin V- of the amplifier chip U4 is connected to a -5V voltage source.

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