CN116299360A - Calibration light source adjusting control circuit and method for aerosol laser radar - Google Patents
Calibration light source adjusting control circuit and method for aerosol laser radar Download PDFInfo
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Abstract
The invention relates to a calibration light source regulation control circuit and a method of an aerosol laser radar, wherein the circuit comprises a communication control module which receives a target current instruction and converts the target current instruction into an LED driving reference voltage value; the fast analog dimming driving module comprises a channel selection unit, a hardware PID control circuit and a current sampling circuit, wherein the channel selection unit comprises a plurality of LED channels, each LED channel is provided with an LED chip, the hardware PID control circuit and the current sampling circuit, and at least one LED channel is selected to be conducted in an n-selection mode each time; the hardware PID control circuit is used for receiving the LED driving reference voltage value; the current sampling circuit collects actual working current of the LED chip and feeds the actual working current back to the communication control module for monitoring. The invention can realize the accurate calibration of system constants such as linearity of a photoelectric detection channel of a radar receiving system, crosstalk between multi-wavelength channels, crosstalk from an elastic scattering channel to a Raman scattering channel and the like.
Description
Technical Field
The invention relates to the technical field of light source control, in particular to a calibration light source adjusting control circuit and method of an aerosol laser radar.
Background
The aerosol laser radar is an aerosol concentration distribution detector used in the field of atmospheric remote sensing, and has the advantages of good directivity, high spatial resolution and the like. Aerosol lidar analyzes the distribution and variation of aerosol particles in the atmosphere by emitting one or more wavelengths of laser light into the atmosphere, interacting with the atmosphere, producing a radiation signal containing information about the gas molecules and aerosol particles, and using an inversion method to obtain information about the gas molecules and aerosol particles therefrom.
Domestic aerosol monitoring radars currently use a multi-wavelength multi-channel lidar system to monitor received backscatter signals. The common multi-wavelength multi-channel aerosol laser radar can emit laser with three wavelengths of 1064nm, 532nm and 355nm into the atmosphere, and generates an echo with the scattering effect of particulate matters, and then the echo is received, analyzed and processed by a multi-channel receiving system. Taking an eight-channel receiving system as an example, the receiving system of the aerosol laser radar can not only receive the rice scattering signals generated by the action of multi-wavelength laser and atmospheric aerosol to obtain the spatial distribution condition of the aerosol and the characteristic information of the particle size of the aerosol; the change of nitrogen and water vapor in the atmosphere can be detected by receiving Raman scattering signals generated by the action of the laser with multiple wavelengths and the atmosphere. The spectrum signals required to be received by each channel in the eight-channel receiving system are different and can not be mutually crosstalked, and the specific functions of each channel mainly depend on a target object of the aerosol laser radar, and the channels are mainly divided into a water vapor Raman channel, a nitrogen Raman channel, rice scattering vertical polarization channels with different wavelengths and rice scattering horizontal polarization channels with different wavelengths.
In addition, for the multi-wavelength multi-channel aerosol laser radar, the accuracy of performance parameters such as spatial resolution, detection distance and the like of the laser radar can be directly influenced by the high and low energy of the acquisition frequency of the data acquisition card in the receiving system. Generally, the faster the data acquisition card acquires the frequency, the higher the spatial resolution, so that the higher the accuracy of the data received by the radar. The clear mathematical relationship shows that when the spatial resolution of the aerosol laser radar is required to be 15m, the acquisition frequency of an acquisition card in a radar receiving system needs to be 10MHz, namely the acquisition speed of the acquisition card needs to be 100ns.
With the wide application of lidar in the field of atmospheric monitoring, the accuracy calibration of lidar has become a focus of attention for instrument manufacturers. In the early stage of aerosol laser radar design production, a large number of simulations and tests are not needed, and the receiving system of the aerosol laser radar needs to be calibrated and calibrated under specific conditions before delivery due to various reasons such as application environments, weather and the like. From the observation of actual detection results, the accuracy calibration of system constants such as the linearity of a photoelectric detection channel of a radar receiving system, the crosstalk between multi-wavelength channels, the crosstalk from an elastic scattering channel to a Raman scattering channel and the like has direct influence on the accuracy of receiving an aerosol laser radar echo signal, so that the atmospheric monitoring precision is influenced. Therefore, there is a need to develop a calibration method for aerosol lidar. The current method for calibrating the aerosol laser radar needs to use various optical and electronic instruments to build a calibration platform and is operated by professional experimenters, so that the cost for calibrating the aerosol laser radar is high, and the repeated operation is difficult. Based on the defects, the external light source rule is to replace the process of generating a back scattering effect by the action of laser emitted by a laser to the laser and the atmosphere by a light source which can be used for simulating a laser echo spectrum signal of the aerosol laser radar. The adjustable external light source can well control the intensity and wavelength of emitted light, so that the difficulty in calibrating the linearity parameters of the photoelectric detection channel of the radar receiving system is greatly reduced. In addition, according to research and practice, the higher the dimming frequency of the external light source is, the higher the finally obtained calibration precision is. Therefore, the light source adjusting control circuit and the method for calibrating the receiving system of the multichannel aerosol laser radar are developed, and the important indexes of the aerosol laser radar receiving system can be calibrated and calibrated in a simple, effective and quick manner.
The utility model patent with publication number CN105188201B in prior art 1 discloses a high-speed dimming circuit applied to LED illumination, which consists of a control module, a digital-to-analog conversion module, an addition circuit and a constant current driving module. According to the scheme of the dimming circuit, an adjusting signal with a preset duty ratio is output according to a control instruction input by a user, and the on and off of a high-speed switch in the circuit are controlled to realize LED dimming. However, the dimming mode only depends on selecting a key device which is rapidly conducted to realize the adjustment control of the LED, and the running speed of the whole circuit only reaches millisecond (ms), which can not meet the nanosecond response speed requirement of the light source regulation circuit required to be achieved when the aerosol laser radar device is calibrated. The utility model patent with publication number CN103596325B in the prior art 2 discloses a high-power LED digital linear dimming system which mainly comprises a filtering and protecting circuit between a DC power supply and an LED chip, a PWM control circuit, an output filtering circuit and a singlechip control circuit. The system ensures constant current output of the circuit in a software PID closed-loop control mode, and uses the STM32 singlechip to analyze and process signals fed back by the circuit, thereby achieving the aim of dimming the LED. However, the system processes the digital quantity by using the STM32 as a system master control and combines with the integrated chip to complete some preset functions, and the internal structure of the integrated chip cannot be changed when the circuit structure is designed, so that the circuit structure is limited when the light source adjustment control system is designed. The utility model patent with publication number CN106251811B in the prior art 3 discloses an LED dimming method, which is realized on the basis of matching a main control unit, an MMI module, a PWM dimming module, a light-emitting module formed by switching a light-emitting module by a plurality of analog switches, N groups of LED light bars and a voltage detection module. The LED dimming method adopts a PWM dimming mode and is provided with a feedback loop, so that certain dimming precision is realized, and meanwhile, a multi-choice analog switch is used for switching a specific LED luminous channel, so that the complex control of the LED lamp group is realized. However, the dimming method selects the multiple channels to be connected to the LED directly after being conducted by using the one-to-one analog switch, and the dimming method is free from buffering, so that the circuit is easy to impact too much to influence the dimming stability. The utility model patent with publication number CN210899736U in the prior art 4 discloses a wireless dimming compatible thyristor dimming LED lighting control circuit, which consists of a power supply module, a wireless module, a control module and an LED driving module. The lighting control circuit scheme is manufactured by using an outsourcing thyristor regulator, a wireless dimming instruction is acquired through a wireless communication unit, a dimming signal is output to an LED driving module, meanwhile, the control module tracks a voltage conversion signal of a thyristor to output a corresponding regulating signal, and the LED driving module adjusts the working state of the thyristor by utilizing the regulating signal, so that stable current is output, and light flickering is eliminated. However, this control circuit adjusts the light source by using a thyristor adjuster, which results in extremely low dimming accuracy and is not suitable for high-accuracy dimming applications. The utility model patent with publication number CN204833006U in the prior art 5 discloses an LED chip dimming system based on PID control, which consists of a control loop, a PID controller, an LED chip and a feedback loop. The system continuously carries out PID operation on the target value and the feedback value after the PID controller sets the parameters by adding the PID controller in front of the LED driver, and the operation result is used as an adjusted accurate control signal to be transmitted to the LED driver, so that the dimming purpose is achieved. However, this system uses a PID controller to adjust a control signal input to the controller, which causes problems such as slow circuit response, low dimming accuracy, indirect dimming, and the like.
In summary, the existing LED dimming circuit can implement millisecond dimming and digital dimming, but if used to simulate the laser echo spectrum signal of the aerosol laser radar, the following problems remain to be solved: firstly, the light source regulation control system only depends on selecting a key device which is rapidly conducted to realize the regulation control of the LED, and the running speed of the whole circuit only reaches millisecond (ms), which can not meet the nanosecond response speed requirement of the light source regulation circuit required to be reached when the aerosol laser radar device is calibrated. Secondly, the light source regulation control system processes the digital quantity only by using the embedded chip as a system main control and combines with the integrated chip to complete some preset functions, and the internal structure of the integrated chip cannot be changed when the circuit structure is designed, so that the circuit structure is limited when the light source regulation control system is designed. Thirdly, the light source adjusting control system is directly connected to the LED after being conducted by selecting a plurality of channels through the multi-channel analog switch, and the light source adjusting control system is free from buffering, so that the circuit is easy to impact too much to influence the dimming stability. Fourth, the light source adjustment control system adjusts the light source by using the thyristor adjuster, which results in very low dimming precision and is not suitable for high-precision dimming occasions. Fifth, the light source adjusting control system adjusts the control signal input to the controller by using the PID controller, which may cause problems of slow circuit response, low dimming precision, indirect dimming, etc. Therefore, there is a strong need to provide a calibration light source adjustment control circuit and method for aerosol laser radar to overcome the above-mentioned drawbacks of the prior art.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the technical defect existing in the prior art, and provide a calibration light source adjusting control circuit and method of an aerosol laser radar, which can control the time from the instruction sent by a communication control module to the corresponding illumination sent by an LED chip to be within 100ns by controlling the light intensity of different illumination sent by the LED chip with specific wavelength, and then the radar receiving system receives the light signal sent by the LED chip, thereby realizing the accurate calibration of the system constants such as the linearity of the photoelectric detection channel of the radar receiving system, the crosstalk between multi-wavelength channels, the crosstalk from the elastic scattering channel to the Raman scattering channel, and the like.
In order to solve the technical problems, the present invention provides a calibration light source adjustment control circuit of an aerosol laser radar, comprising:
the communication control module is used for receiving a target current instruction, and the target current instruction is converted into an LED driving reference voltage value;
the fast analog dimming driving module comprises a channel selection unit, a hardware PID control circuit and a current sampling circuit, wherein the channel selection unit comprises a multiplexer and a switch circuit and is used for selecting a plurality of LED channels, each LED channel is provided with an LED chip, at least one LED channel in the plurality of LED channels is selected to be conducted in an n-selecting mode each time, and n is more than or equal to 1;
Each of the LED channels is provided with a hardware PID control circuit connected with the LED chip and a current sampling circuit connected with the hardware PID control circuit, and the hardware PID control circuit is used for receiving an LED driving reference voltage value;
when the hardware PID control circuit on the conducted LED channel is provided with the input of the LED driving reference voltage value, the hardware PID control circuit on the LED channel drives the LED chip on the LED channel to emit light, and the current sampling circuit collects the actual working current of the LED chip in real time and feeds the actual working current back to the hardware PID control circuit for PID negative feedback adjustment and feeds the actual working current back to the communication control module for real-time monitoring.
In one embodiment of the invention, the intelligent dimming control system further comprises a power supply module, wherein the power supply module comprises a plurality of power supply output ends for supplying power, and the plurality of power supply output ends are respectively connected with the communication control module and the rapid analog dimming driving module.
In one embodiment of the present invention, the communication control module includes a first controller, a second controller and a digital-to-analog converter connected in sequence, where the first controller is configured to receive a target current command and convert the target current command into an LED driving reference voltage value, the second controller is configured to transmit a digital quantity corresponding to the LED driving reference voltage value to the digital-to-analog converter, and the digital-to-analog converter is configured to convert the received digital quantity into an analog quantity.
In one embodiment of the present invention, the first controller is embedded circuitry, the second controller is FPGA circuitry, and the digital-to-analog converter is a high-speed DAC chip.
In one embodiment of the present invention, a switching circuit is disposed on each of the plurality of LED channels, and the plurality of switching circuits are connected to the demultiplexer, and the demultiplexer outputs a high level or a low level according to an instruction from the first controller, for selecting at least one of the plurality of LED channels to be turned on.
In one embodiment of the invention, the switch circuit comprises a first triode, a PMOS tube, a first resistor, a second resistor and a first capacitor, wherein the base electrode of the first triode is connected with the multiplexer, the emitter electrode of the first triode is grounded, the collector electrode of the first triode is connected with the grid electrode of the PMOS tube through the first resistor, the drain electrode of the PMOS tube is connected with a power output end of the power module, the source electrode of the PMOS tube is connected with the positive electrode of the LED chip, a second resistor is connected between the grid electrode and the drain electrode of the PMOS tube in parallel, the first capacitor is connected with the second resistor in parallel, the on-off state of the first triode is controlled through the high-low level output by the multiplexer so as to control the on-off state of the PMOS tube, and at least one LED channel in the LED channels is selected to be conducted.
In one embodiment of the present invention, the hardware PID control circuit includes a second triode, a sampling resistor, a first operational amplifier, a third resistor and an accelerating capacitor, where a collector of the second triode is connected with a cathode of the LED chip, an emitter of the second triode is connected with one end of the sampling resistor, another end of the sampling resistor is grounded, a base of the second triode is connected with a pin of the first operational amplifier through the third resistor, another pin of the first operational amplifier is connected with the digital-analog converter, and the accelerating capacitor is connected in parallel with the third resistor.
In one embodiment of the invention, the current sampling circuit comprises a second operational amplifier connected with the emitter of the second triode and a plurality of current sampling sub-circuits, wherein each current sampling sub-circuit in the plurality of current sampling sub-circuits is arranged between the second operational amplifier and the first controller, and the actual working current of the plurality of LED chips is sampled through the second operational amplifier at the same time and is sent to the first controller for real-time monitoring after being amplified.
In one embodiment of the present invention, each current sampling sub-circuit includes a third capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a fourth capacitor and a fifth capacitor, where the third capacitor is connected between a pin of the second operational amplifier and the sixth resistor, and the other end of the sixth resistor is grounded; the fourth resistor is connected with the third capacitor in parallel; the fifth resistor is connected between one pin of the second operational amplifier and the first controller; one end of the fourth capacitor is connected with one power output end of the power module, and the other end of the fourth capacitor is grounded; the fifth capacitor is connected in parallel with the fourth capacitor.
In addition, the invention also provides a calibration light source adjustment control method of the aerosol laser radar, which uses the calibration light source adjustment control circuit of the aerosol laser radar, and comprises the following steps:
step S1: giving a target current instruction of each period of the LED chip on at least one LED channel;
step S2: transmitting the target current instruction of each period to a communication control module, after receiving the target current instruction, a first controller in the communication control module converts the target current value of each period into a corresponding LED driving reference voltage value, and transmits the LED driving reference voltage value to a second controller;
step S3: the second controller outputs digital quantity corresponding to the LED driving reference voltage value to the digital-to-analog converter, and simultaneously feeds back a signal of successful or failed data receiving to the first controller;
step S4: the digital-to-analog converter converts the received digital quantity into analog quantity, and transmits the LED driving reference voltage value converted into the digital quantity to a hardware PID control circuit on a plurality of LED channels in the rapid analog dimming driving module;
step S5: the multiplexer outputs high level or low level according to an instruction from the first controller, is used for selecting at least one LED channel of the plurality of LED channels to be conducted, a hardware PID control circuit on the conducted at least one LED channel takes a received LED driving reference voltage value as a positive phase input of the first operational amplifier, and the working current of an LED power supply is converted into voltage through a sampling resistor to be taken as a negative phase input of the first operational amplifier, so that the LED chip is ensured to work in a constant current state;
Step S6: the current sampling circuit samples the current flowing through the LED chip, the sampled current is amplified by the second operational amplifier and fed back to the first controller, and the first controller monitors the received amplified sampled current in real time;
step S7: after a channel with a corresponding wavelength in an optical receiving system of the aerosol laser radar receives a signal sent by the LED chip, converting the optical signal into an electric signal, and calculating system parameters of the radar receiving system so as to judge whether the radar receiving system meets factory requirements.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) The invention relates to a calibration light source regulation control circuit and a method for an aerosol laser radar, which can control the time from the instruction sent by a communication control module to the corresponding illumination sent by an LED chip to be within 100ns by controlling the light intensity of different illumination sent by the LED chip with specific wavelength, and then a radar receiving system receives the light signals sent by the LED chip, thereby realizing the accurate calibration of system constants such as the linearity of a photoelectric detection channel of the radar receiving system, the crosstalk between multi-wavelength channels, the crosstalk from an elastic scattering channel to a Raman scattering channel and the like, and making a significant contribution to the field of atmospheric aerosol monitoring;
(2) According to the calibration light source regulation control circuit and method for the aerosol laser radar, the response time of the light source regulation control circuit is improved by adopting a mode of combining a fast-on component and hardware PID closed-loop feedback control, so that the use requirement of the calibration aerosol laser radar is 100 ns.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which
Fig. 1 is an eight-way LED dimming schematic diagram of a calibration light source adjustment control circuit for an aerosol laser radar according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of one-way LED dimming of a calibration light source adjustment control circuit of an aerosol laser radar according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a power module according to an embodiment of the invention.
Fig. 4 is a schematic circuit diagram of a power module according to an embodiment of the invention.
Fig. 5 is a schematic diagram of an eight-way switching circuit and a hardware PID control circuit in a fast analog dimming driving module according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a single-way switch circuit and a hardware PID control circuit in a fast analog dimming driving module according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of a four-way current sampling circuit in a fast analog dimming driving module according to an embodiment of the present invention.
Fig. 8 is a flowchart of a calibration light source adjustment control method of an aerosol laser radar according to a second embodiment of the present invention.
Reference numerals in the drawings are described as follows: 1. a PC end; 2. a power module; 3. a communication control module; 4. a rapid analog dimming driving module; 5. an LED chip module; 6. an embedded circuitry; 7. FPGA circuitry; 8. a high speed DAC chip; 9. embedded programming software; 10. FPGA programming software; 11. a demultiplexer; 12. a switching circuit; 13. a hardware PID control circuit; 14. a current sampling circuit; 15. a first triode; 16. a resistor; 17. a capacitor; 18. a MOS tube; 19. a first operational amplifier; 20. a second triode; 21. sampling a resistor; 22. a second operational amplifier; 23. a resistor; 24. a capacitor; 25. a 24V regulated power supply; 26. an 8V buck module; 27. a 5V buck module; 28. 3.3V buck module; 29. a 2.5V buck module; 30. 1.2V buck module.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
Referring to fig. 1-7, a first embodiment of the present invention provides a calibration light source adjustment control circuit for an aerosol laser radar, which includes a communication control module 3, a fast analog dimming driving module 4, a power module 2 and an LED chip module 5. The communication control module 3 is configured to receive a target current command (the target current command may be from the PC terminal 1), and the target current command is converted into an LED driving reference voltage value; the fast analog dimming driving module 4 comprises a channel selection unit, a hardware PID control circuit 13 and a current sampling circuit 14, wherein the channel selection unit comprises a demultiplexer 11 and a switch circuit 12 and is used for selecting a plurality of LED channels, each LED channel is provided with an LED chip, at least one LED channel in the plurality of LED channels is selected to be conducted in an n-selecting mode each time, and n is more than or equal to 1; each of the plurality of LED channels is provided with a hardware PID control circuit 13 connected with the LED chip and a current sampling circuit 14 connected with the hardware PID control circuit 13, wherein the hardware PID control circuit 13 is used for receiving an LED driving reference voltage value; when the hardware PID control circuit 13 on the conducted LED channel has the input of the LED driving reference voltage value, the hardware PID control circuit 13 on the LED channel drives the LED chip on the LED channel to emit light, the current sampling circuit 14 collects the actual working current of the LED chip in real time and feeds the actual working current back to the hardware PID control circuit 13 for PID negative feedback regulation, and feeds the actual working current back to the communication control module 3 for real-time monitoring; the power supply module 2 is connected with the communication control module 3 and the rapid analog dimming driving module 4, and provides required voltage for the communication control module 3 and the rapid analog dimming driving module 4 through the power supply module 2; the LED chip module 5 includes an LED chip.
The calibration light source regulation control circuit of the aerosol laser radar can control the time from the instruction sent by the communication control module 3 to the corresponding illumination sent by the LED chip to be within 100ns by controlling the light intensity of different illumination sent by the LED chip with specific wavelength, and then the radar receiving system receives the light signals sent by the LED chip, thereby realizing the accurate calibration of the system constants such as the linearity of the photoelectric detection channel of the radar receiving system, the crosstalk between multiple wavelength channels, the crosstalk from the elastic scattering channel to the Raman scattering channel and the like, and making a significant contribution to the field of atmospheric aerosol monitoring.
Because the spectrum signals required to be received by each channel in the receiving system of the multi-wavelength multi-channel aerosol laser radar are different and can not be mutually crosstalked, the specific functions of each channel mainly depend on a target object of the aerosol laser radar and are mainly divided into a water vapor Raman channel, a nitrogen Raman channel, a rice scattering vertical polarization channel with different wavelengths and a rice scattering horizontal polarization channel with different wavelengths. Preferably, the calibration light source adjustment control circuit of the aerosol laser radar provided in this embodiment uses eight light wave signals with specific wavelengths and characteristics to correspond to the spectrum signals of each channel in the aerosol laser radar receiving system, for example, the LED chip module 5 includes eight LED chips with specific wavelengths for sending the light wave signals with specific wavelengths to the aerosol laser radar receiving system for receiving.
The communication control module 3 includes a first controller, a second controller and a digital-to-analog converter, which are sequentially connected, and preferably, the first controller is an embedded circuit system 6, the second controller is an FPGA circuit system 7, the digital-to-analog converter is a high-speed DAC chip 8, the embedded circuit system 6 and the FPGA circuit system 7 are mainly used for circuit hardware control and circuit software control, the embedded circuit system 6 is also used for communicating with the PC terminal 1, and outputting a signal to the FPGA circuit system 7 for receiving, and the FPGA circuit system 7 is mainly responsible for outputting a digital quantity according to an instruction requirement sent by the embedded circuit system 6; the high-speed DAC chip 8 takes the digital quantity output by the FPGA circuit system 7 as input and converts the digital quantity into analog quantity output, so that a high-precision LED driving reference voltage value is provided for the hardware PID control circuit 13. The above-described embedded circuitry 6 is programmed by the embedded programming software 9 to perform the required functions and the FPGA circuitry 7 is programmed by the FPGA programming software 10 to perform the required functions.
The faster the acquisition frequency of the data acquisition card in the receiving system of the aerosol laser radar is, the higher the spatial resolution of the laser radar is, so that the higher the accuracy of the data received by the radar is. Therefore, the calibration light source adjusting control circuit of the aerosol laser radar provided by the embodiment combines a quick-conduction device and hardware PID closed-loop feedback control, and meets the use requirement that the acquisition frequency of a data acquisition card in an aerosol laser radar receiving system is 10MHz (the acquisition speed is 100 ns) in a mode of matching an embedded circuit system 6 with an FPGA circuit system 7.
The channel selection unit includes a multiplexer 11 and a switch circuit 12, each of the LED channels is provided with the switch circuit 12, the switch circuits 12 are connected to the multiplexer 11, the multiplexer 11 outputs a high level or a low level according to an instruction from the embedded circuit system 6, at least one LED channel of the LED channels is selected to be turned on by the switch circuit 12, and the other parts are used for driving the LED with constant current and cooperate with the communication control module 3 to achieve the purpose of precisely adjusting and controlling the LED light source.
As shown in fig. 3, the power supply module 2 includes a 24V regulated power supply 25, an 8V buck module 26, a 5V buck module 27, a 3.3V buck module 28, a 2.5V buck module 29, and a 1.2V buck module 30. The 24V regulated power supply 25 can provide a stable 24V dc power supply, and the highest power must be able to meet the power value required when eight LED chips in the LED chip module 5 operate simultaneously, and the power supply may be a mature product in the market. The 8V buck module 26 is connected with and supplies power to the switching circuit 12 in the fast analog dimming driving module 4, and the 8V buck module 26 adopts a high-power-density, integrated switch and FET-type buck voltage stabilizing chip. The 5V buck module 27 is connected with and supplies power to the current sampling circuit 14 and the hardware PID control circuit 13. The 3.3V voltage reducing module 28, the 2.5V voltage reducing module 29 and the 1.2V voltage reducing module 30 are connected with the communication control module and supply power to the embedded circuit system 6 and the FPGA circuit system 7 in the communication control module 3, and the 3.3V voltage reducing module 28, the 2.5V voltage reducing module 29 and the 1.2V voltage reducing module 30 all adopt high-power-density, integrated switch and FET voltage reducing and stabilizing chips, wherein the 3.3V voltage reducing module 28 mainly provides power for the embedded circuit system 6 and the FPGA circuit system 7, and other voltage reducing modules serve the normal working requirements of the FPGA circuit system 7.
As shown in fig. 1, 2, 5, 6 and 7, the calibration light source adjustment control circuit of the aerosol laser radar provided by the invention comprises eight paths of fast analog dimming driving modules 4. The specific circuit and the working principle of the fast analog dimming driving module 4 are described in detail by taking the single fast analog dimming driving module 4 shown in fig. 6 as an example.
The switch circuit 12 includes a first triode Q2, a PMOS transistor Q1, a first resistor R14, a second resistor R15, and a first capacitor C14, where a base electrode of the first triode Q2 is connected to pin No. 15 of the demultiplexer 11, an emitter electrode of the first triode Q2 is grounded, a drain electrode of the PMOS transistor Q1 is connected to an 8V power supply, a source electrode of the PMOS transistor is connected to a positive electrode of the LED1 chip D1, one end of the first resistor R14 is connected to a collector electrode of the first triode Q2, another end of the first resistor R14 is connected to a gate electrode of the PMOS transistor Q1, the second resistor R15 is connected in parallel between gate and drain electrodes of the PMOS transistor Q1, and the first capacitor C14 is connected in parallel to two ends of the second resistor R15.
The switching circuit 12 operates as follows: after the external light source regulation control system is electrified, the power module outputs 8V voltage to supply power for the switch circuit. When the base electrode of the first triode Q2 inputs a low level, no base electrode current exists, the first triode Q2 is disconnected, at the moment, the two ends of the gate-drain electrode of the PMOS tube Q1 obtain high voltage, and the switch circuit is in an off state; when the base electrode of the first triode Q2 inputs high level, the base electrode current exists, the first triode Q2 is conducted, at the moment, the two ends of the gate-drain electrode of the PMOS tube Q1 obtain low voltage, and the switch circuit is in a conducting state.
The hardware PID control circuit 13 comprises a second triode Q3, a sampling resistor Rcs1, a first operational amplifier U5, a third resistor R16, an acceleration capacitor C15 and a second capacitor C16, wherein the collector electrode of the second triode Q3 is connected with the negative electrode of the LED1 chip D1; one end of the sampling resistor Rcs1 is connected with the emitter of the second triode Q3, and the other end of the sampling resistor Rcs1 is grounded; the No. 2 pin of the first operational amplifier U5 is grounded, the No. 3 pin is connected with an output port of a high-speed DAC chip 8 in the communication control module 3, the No. 4 pin is connected with an emitter of the second triode Q3, and the No. 5 pin is connected with a 5V power supply; one end of the third resistor R16 is connected with the base electrode of the second triode Q3, and the other end of the third resistor R16 is connected with the No. 1 pin of the first operational amplifier U5; the accelerating capacitor C15 is connected in parallel with two ends of the third resistor R16; one end of the second capacitor C16 is connected with a 5V power supply, and the other end of the second capacitor C16 is grounded.
The working principle of the hardware PID control circuit 13 is as follows: after the external light source regulation control system is electrified, the power supply module outputs 8V and 5V voltages to supply power for the switching circuit and the first operational amplifier U5 respectively, when the demultiplexer 11 outputs a high level, the switching circuit 12 is conducted, the hardware PID control circuit 13 is electrified, the positive phase input of the first operational amplifier U5 receives the IADJ reference voltage output by the high-speed DAC core, the negative phase input converts the current flowing through the LED chip into voltage through the sampling resistor to be received, at the moment, the first operational amplifier U5 is used as a voltage follower, the negative phase input is continuously regulated along with the positive phase input, so that the positive phase input and the negative phase input are consistent, the current flowing through the LED chip and the target current are kept consistent, and the LED chip is enabled to work in a constant current state.
The current sampling circuit 14 includes a second operational amplifier U13, a third capacitor C39, a fourth resistor R39, a fifth resistor R40, a sixth resistor R41, a fourth capacitor C40, and a fifth capacitor C41, where a pin No. 4 of the second operational amplifier U13 is connected to a 5V power supply, a pin No. 3 is connected to an emitter of a second triode Q3 in the hardware PID control circuit 13, one end of the third capacitor C39 is connected to a pin No. 1 of the second operational amplifier U13, the other end of the third capacitor C39 is connected to one end of the sixth resistor R41, the fourth resistor R39 is connected in parallel to two ends of the third capacitor C39, one end of the fifth resistor R40 is connected to a pin No. 1 of the second operational amplifier, the other end of the fifth resistor R40 is connected to an IO port of an embedded chip in the embedded circuit system 6, one end of the sixth resistor R41 is connected to one end of the third capacitor C39, the other end of the sixth resistor R41 is grounded, the other end of the fourth resistor C40 is connected to the other end of the fourth capacitor C40, and the other end of the fourth resistor C40 is connected to the other end of the fourth capacitor C41 is connected to the ground.
The operating principle of the current sampling circuit 14 is as follows: after the external light source regulation control system is electrified, the power supply module outputs 5V voltage to supply power for the current sampling circuit 14, and as the second operational amplifier U13 can sample four paths of currents simultaneously, the sampling of the LED current in the four paths of hardware PID control circuits can be directly connected to one second operational amplifier U13, the sampled current is amplified by 4.3 times through the fourth resistor R39, the fifth resistor R40 and the sixth resistor R41 and then is output to an IO port of an embedded chip in the embedded circuit system 6 to be received, the obtained current is monitored by programming in the embedded chip, and circuit protection measures are adopted when the obtained current exceeds a set maximum value.
The calibration light source regulation control circuit of the aerosol laser radar can reach the response speed of 100ns, and firstly, the circuit preliminarily improves the response speed of the light source regulation circuit by adopting a quick-turn-on device; secondly, by adopting a hardware analog dimming mode and a hardware PID closed-loop feedback control mode, the response time of a digital device required by PWM dimming is saved, the response speed of a light source regulating circuit is further improved, the use requirement of 100ns is met when the aerosol laser radar is calibrated, and the LED is ensured to work in a constant current state, so that the analog dimming precision is improved; and thirdly, an embedded circuit system and an FPGA circuit system dual-core control system are adopted to optimize the structure of an external light source adjusting control circuit, and meanwhile, the efficiency of processing digital quantity of the system is improved.
Example two
The second embodiment of the invention provides a calibration light source adjustment control method of an aerosol laser radar, which uses the calibration light source adjustment control circuit of the aerosol laser radar provided in the first embodiment. Referring to fig. 8, the method for adjusting and controlling the calibration light source of the aerosol laser radar according to the present embodiment includes the following steps:
Step S1: giving a target current instruction of each period of the LED chip on at least one LED channel;
step S2: transmitting the target current instruction of each period to the communication control module 3, after receiving the target current instruction, the embedded circuit system 6 in the communication control module 3 converts the target current value of each period into a corresponding LED driving reference voltage value, and transmits the LED driving reference voltage value to the FPGA circuit system 7;
step S3: the FPGA circuit system 7 outputs digital quantity corresponding to the LED drive reference voltage value to the high-speed DAC chip 8, and simultaneously feeds back a signal of successful or failed data reception to the embedded circuit system 6;
step S4: the high-speed DAC chip 8 converts the received digital quantity into analog quantity, and transmits the LED driving reference voltage value converted into the digital quantity to the hardware PID control circuit 13 on the multi-path LED channels in the rapid analog dimming driving module 4;
step S5: the multiplexer 11 outputs a high level or a low level according to an instruction from the embedded circuit system 6, and is used for selecting at least one of the plurality of LED channels to be conducted, the hardware PID control circuit 13 on the conducted at least one LED channel takes the received LED driving reference voltage value as the positive phase input of the first operational amplifier, and the working current of the LED power supply is converted into a voltage through the sampling resistor and is taken as the negative phase input of the first operational amplifier, so that the LED chip is ensured to work in a constant current state;
Step S6: the current sampling circuit samples the current flowing through the LED chip, the sampled current is amplified by the second operational amplifier and fed back to the embedded circuit system 6, and the embedded circuit system 6 monitors the received amplified sampled current in real time;
step S7: after a channel with a corresponding wavelength in an optical receiving system of the aerosol laser radar receives a signal sent by the LED chip, converting the optical signal into an electric signal, and calculating system parameters of the radar receiving system so as to judge whether the radar receiving system meets factory requirements.
As an example, the method for controlling adjustment of a calibration light source of an aerosol laser radar according to the present embodiment specifically includes the following operations: powering on a calibration light source regulation control system of the aerosol laser radar, and converting voltage into 8V, 5V, 3.3V, 2.5V and 1.2V of direct current after the power supply module 2 is powered on to supply power for the communication control module 3 and the rapid analog dimming driving module 4; the user sets the minimum target current, the maximum target current and the change of the current value of every other period, which are needed to be achieved when the LED chip with specific wavelength works in the LED chip module 5, at the PC end 1, and the PC end 1 transmits the target current instruction of every period to the communication control module 3 through MODBUS communication; after receiving the target current instruction of each period transmitted by the PC end 1, the embedded circuit system 6 in the communication control module 3 converts the target current value of each period input by a user into a corresponding LED driving reference voltage value, and transmits the LED driving reference voltage value to the FPGA circuit system 7 through UART communication; the FPGA circuit system 7 in the communication control module 3 outputs digital quantity corresponding to the LED driving reference voltage value to the high-speed DAC chip 8, and simultaneously feeds back a signal of success or failure to the embedded circuit system 6 through UART communication; the high-speed DAC chip 8 in the communication control module 3 converts the received digital quantity into analog quantity, and simultaneously transmits the analog quantity to the first operational amplifier U5 of the eight-channel hardware PID control circuit 13 in the fast analog dimming driving module 4 to be used as high-precision reference voltage; after the embedded circuit system 6 in the communication control module 3 uses the LED instruction with which path of corresponding wavelength according to the selection transmitted by the PC end 1, the embedded circuit system 6 controls the conduction of one path of the eight paths of switch circuits 12 by controlling the IO port of the control pin of the demultiplexer 11 to output high level or low level; the hardware PID control circuit 13 takes the received LED driving reference voltage value as the positive phase input of the first operational amplifier U5, converts the working current of the LED chip module 5 into voltage through the sampling resistor Rcs1 to be taken as the negative phase input of the first operational amplifier U5, so as to ensure that the LED chip works in a constant current state, the first operational amplifier U5 is used as a voltage follower, and the output voltage of the first operational amplifier U5 changes along with the positive phase input voltage, so that the working current of the LED chip module 5 is ensured to be the target current of the PC end 1; the current sampling circuit 14 samples the current flowing through the LED chip module 5, and the sampled current is amplified by the second operational amplifier U13 and then fed back to an IO port of an embedded chip of the embedded circuit system for receiving; the embedded circuit system 6 monitors the received amplified sampling current, and takes circuit protection measures when the received amplified sampling current exceeds a set maximum value; after a channel with a corresponding wavelength in the optical receiving system of the aerosol laser radar receives a signal sent by an LED chip in the LED chip module 5, the acquisition card converts the optical signal into an electric signal and transmits the electric signal to the PC end 1, and system parameters such as linearity and the like of the radar receiving system are calculated, so that whether the radar receiving system meets the factory requirement is judged.
The method for controlling the adjustment of the calibration light source of the aerosol laser radar according to the present embodiment is implemented based on the foregoing calibration light source adjustment control circuit of the aerosol laser radar, so that the detailed description of the method can be found in the foregoing example section of the calibration light source adjustment control circuit of the aerosol laser radar, and therefore, the detailed description of the method can be referred to the corresponding description of the examples of the various sections and will not be repeated herein.
In addition, since the calibration light source adjustment control method of the aerosol laser radar of the present embodiment is implemented based on the calibration light source adjustment control circuit of the aerosol laser radar, the function of the method corresponds to the function of the circuit, and the description thereof is omitted here.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. The utility model provides a calibration light source regulation control circuit of aerosol laser radar which characterized in that: comprising the following steps:
the communication control module is used for receiving a target current instruction, and the target current instruction is converted into an LED driving reference voltage value;
the fast analog dimming driving module comprises a channel selection unit, a hardware PID control circuit and a current sampling circuit, wherein the channel selection unit comprises a multiplexer and a switch circuit and is used for selecting a plurality of LED channels, each LED channel is provided with an LED chip, at least one LED channel in the plurality of LED channels is selected to be conducted in an n-selecting mode each time, and n is more than or equal to 1;
Each of the LED channels is provided with a hardware PID control circuit connected with the LED chip and a current sampling circuit connected with the hardware PID control circuit, and the hardware PID control circuit is used for receiving an LED driving reference voltage value;
when the hardware PID control circuit on the conducted LED channel is provided with the input of the LED driving reference voltage value, the hardware PID control circuit on the LED channel drives the LED chip on the LED channel to emit light, and the current sampling circuit collects the actual working current of the LED chip in real time and feeds the actual working current back to the hardware PID control circuit for PID negative feedback adjustment and feeds the actual working current back to the communication control module for real-time monitoring.
2. The calibration light source adjustment control circuit of an aerosol lidar according to claim 1, wherein: the intelligent dimming control system comprises a communication control module, a fast analog dimming driving module and a power module, wherein the communication control module is connected with the fast analog dimming driving module, and the fast analog dimming driving module is connected with the communication control module.
3. The calibration light source adjustment control circuit of an aerosol laser radar according to claim 1 or 2, characterized in that: the communication control module comprises a first controller, a second controller and a digital-to-analog converter which are sequentially connected, wherein the first controller is used for receiving a target current instruction and converting the target current instruction into an LED driving reference voltage value, the second controller is used for transmitting digital quantity corresponding to the LED driving reference voltage value to the digital-to-analog converter, and the digital-to-analog converter is used for converting the received digital quantity into analog quantity.
4. A calibration light source adjustment control circuit for an aerosol lidar according to claim 3, wherein: the first controller is an embedded circuit system, the second controller is an FPGA circuit system, and the digital-to-analog converter is a high-speed DAC chip.
5. A calibration light source adjustment control circuit for an aerosol lidar according to claim 3, wherein: each of the plurality of LED channels is provided with a switch circuit, the plurality of switch circuits are connected with the multiplexer, and the multiplexer outputs high level or low level according to an instruction from the first controller and is used for selecting at least one of the plurality of LED channels to be conducted.
6. The aerosol laser radar calibration light source adjustment control circuit of claim 5, wherein: the switching circuit comprises a first triode, a PMOS tube, a first resistor, a second resistor and a first capacitor, wherein a base electrode of the first triode is connected with the multiplexer, an emitting electrode of the first triode is grounded, a collector electrode of the first triode is connected with a grid electrode of the PMOS tube through the first resistor, a drain electrode of the PMOS tube is connected with a power supply output end of the power supply module, a source electrode of the PMOS tube is connected with a positive electrode of the LED chip, a second resistor is connected between the grid electrode and the drain electrode of the PMOS tube in parallel, the first capacitor is connected with the second resistor in parallel, the on-off state of the first triode is controlled through the high-low level output by the multiplexer, so that the on-off state of the PMOS tube is controlled, and at least one LED channel in a plurality of LED channels is selected to be conducted.
7. The aerosol laser radar calibration light source adjustment control circuit of claim 6, wherein: the hardware PID control circuit comprises a second triode, a sampling resistor, a first operational amplifier, a third resistor and an accelerating capacitor, wherein a collector electrode of the second triode is connected with a negative electrode of the LED chip, an emitting electrode of the second triode is connected with one end of the sampling resistor, the other end of the sampling resistor is grounded, a base electrode of the second triode is connected with one pin of the first operational amplifier through the third resistor, the other pin of the first operational amplifier is connected with the digital-analog converter, and the accelerating capacitor is connected with the third resistor in parallel.
8. The aerosol laser radar calibration light source adjustment control circuit of claim 7, wherein: the current sampling circuit comprises a second operational amplifier connected with the emitter of the second triode and a plurality of current sampling sub-circuits, each current sampling sub-circuit in the plurality of current sampling sub-circuits is arranged between the second operational amplifier and the first controller, and the actual working current of the plurality of LED chips is sampled through the second operational amplifier at the same time and is sent to the first controller for real-time monitoring after being amplified.
9. The aerosol laser radar calibration light source adjustment control circuit of claim 8, wherein: each current sampling sub-circuit comprises a third capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a fourth capacitor and a fifth capacitor, wherein the third capacitor is connected between one pin of the second operational amplifier and the sixth resistor, and the other end of the sixth resistor is grounded; the fourth resistor is connected with the third capacitor in parallel; the fifth resistor is connected between one pin of the second operational amplifier and the first controller; one end of the fourth capacitor is connected with one power output end of the power module, and the other end of the fourth capacitor is grounded; the fifth capacitor is connected in parallel with the fourth capacitor.
10. A calibration light source adjustment control method of an aerosol laser radar is characterized in that: the method using the calibrated light source adjustment control circuit of an aerosol lidar according to any of claims 1 to 9, the method comprising the steps of:
step S1: giving a target current instruction of each period of the LED chip on at least one LED channel;
step S2: transmitting the target current instruction of each period to a communication control module, after receiving the target current instruction, a first controller in the communication control module converts the target current value of each period into a corresponding LED driving reference voltage value, and transmits the LED driving reference voltage value to a second controller;
Step S3: the second controller outputs digital quantity corresponding to the LED driving reference voltage value to the digital-to-analog converter, and simultaneously feeds back a signal of successful or failed data receiving to the first controller;
step S4: the digital-to-analog converter converts the received digital quantity into analog quantity, and transmits the LED driving reference voltage value converted into the digital quantity to a hardware PID control circuit on a plurality of LED channels in the rapid analog dimming driving module;
step S5: the multiplexer outputs high level or low level according to an instruction from the first controller, is used for selecting at least one LED channel of the plurality of LED channels to be conducted, a hardware PID control circuit on the conducted at least one LED channel takes a received LED driving reference voltage value as a positive phase input of the first operational amplifier, and the working current of an LED power supply is converted into voltage through a sampling resistor to be taken as a negative phase input of the first operational amplifier, so that the LED chip is ensured to work in a constant current state;
step S6: the current sampling circuit samples the current flowing through the LED chip, the sampled current is amplified by the second operational amplifier and fed back to the first controller, and the first controller monitors the received amplified sampled current in real time;
Step S7: after a channel with a corresponding wavelength in an optical receiving system of the aerosol laser radar receives a signal sent by the LED chip, converting the optical signal into an electric signal, and calculating system parameters of the radar receiving system so as to judge whether the radar receiving system meets factory requirements.
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