CN115633420B - Multichannel adjustable light source control system and control method - Google Patents
Multichannel adjustable light source control system and control method Download PDFInfo
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- CN115633420B CN115633420B CN202211212912.6A CN202211212912A CN115633420B CN 115633420 B CN115633420 B CN 115633420B CN 202211212912 A CN202211212912 A CN 202211212912A CN 115633420 B CN115633420 B CN 115633420B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/155—Coordinated control of two or more light sources
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/165—Controlling the light source following a pre-assigned programmed sequence; Logic control [LC]
Abstract
The invention discloses a multichannel adjustable light source control system and a control method, wherein the multichannel adjustable light source control system comprises the following steps: the upper computer is used for inputting signals to be controlled, the control signals are divided into digital voltage signals, current signals and PWM signals through the singlechip, the control signals are divided into a plurality of control channels, multi-channel control is realized, the voltage control signals are converted into analog output signals through the DAC module, the brightness of the LED light source is adjusted through the driving chip, voltage driving control is realized, the brightness of the LED light source is adjusted according to the PWM signals, PWM signal control is realized, the current signals or the voltage signals are input into the LED control module, and the brightness of the LED light source is adjusted through the LED control module. The invention realizes multichannel control, and realizes adjustment of numerical values through the upper computer, thereby being capable of accurately controlling the luminous intensity and improving the control precision of the light source.
Description
Technical Field
The invention relates to the technical field of light source control, in particular to a multichannel adjustable light source control system and a control method.
Background
In the prior art, in the processes of camera AA, calibration, fire test and the like, a test chart card needs to be used, and the test chart card needs to be illuminated by using a light source. In practical use, the light source is required to be stable and the brightness of the light source is required to be adjusted in multiple stages, and under the scene of multiple light sources, the brightness of the light is generally required to be manually adjusted, the adjustment resolution is low, the off-line operation is performed, the number of channels is small, and the output value error is large. And the regulating channel is single, when the regulating channel breaks down, the regulating channel cannot be used.
From the above, it can be seen how to achieve multi-channel modulation is a problem to be solved at present.
Disclosure of Invention
The invention aims to provide a multichannel adjustable light source control system and a control method, which solve the defects of single light source adjusting channel and low resolution in the prior art.
In order to solve the above technical problems, the present invention provides a multi-channel adjustable light source control system, comprising:
the LED driving chip receives an analog voltage signal or a PWM signal as a control signal to adjust the brightness of the LED light source;
the second channel takes an LED control module as an adjusting mode of the LED light source, and the LED control module receives a modulation voltage or a modulation current as a control signal to adjust the brightness of the LED light source;
the upper computer is provided with an input interface and is used for inputting an adjusting value, wherein the adjusting value comprises a voltage value, a current value and a PWM wave value;
the singlechip is connected with the upper computer through a USB serial port, and generates corresponding digital voltage signals, current signals and PWM signals according to the regulating values input by the upper computer, wherein the PWM signals are output to the first channel, and the current signals are output to the second channel;
the DAC module is connected to the singlechip, converts the digital voltage signal of the singlechip into an analog voltage signal and outputs the analog voltage signal to the first channel and the second channel respectively.
Preferably, the method further comprises:
the LED lamp group is used for controlling the light emission according to the LED driving chip and the LED control module;
and one end of the switching module is connected with the first channel output end and the second channel output end, and the other end of the switching module is connected with the LED lamp group and used for switching the control channel.
Preferably, the single chip microcomputer includes: STM32F102C6T6, STM32F103C6T6A.
Preferably, the DAC module employs DAC chips TL5649, TL3931.
Preferably, the LED driving chip includes MBI6656, SB42511, LM3402.
Preferably, the LED driving chip includes a voltage control channel and a PWM wave control channel.
Preferably, the voltage control channel includes:
and controlling the output of the LED driving chip according to the output analog voltage, and adjusting the brightness of the LED light source.
Preferably, the PWM wave control channel includes:
and controlling the output of the LED driving chip according to the PWM wave duty ratio, and adjusting the brightness of the LED light source.
The invention also provides a multichannel adjustable light source control method, which comprises the following steps:
setting an illumination intensity control signal;
inputting the illumination intensity control signal into a singlechip, and dividing the illumination intensity control signal into a digital voltage signal, a current signal and a PWM signal by using the singlechip;
converting the digital voltage signal into an analog output voltage using a DAC module;
inputting the analog output voltage or the PWM signal into an LED driving chip, and adjusting the brightness of an LED light source by using the LED driving chip;
and inputting the current signal or the analog output voltage into an LED control module, and adjusting the brightness of the LED light source by using the LED control module.
Preferably, the present invention also provides the use of a multi-channel adjustable light source control method as described in any one of the preceding claims in an optical test system.
The multi-channel adjustable light source control system and the control method provided by the invention are provided with a plurality of control channels, so that flexible control is realized, firstly, a signal required to be controlled is input by an upper computer, a control signal is divided into a digital voltage signal, a current signal and a PWM signal through a singlechip, the control signal is divided into a plurality of control channels, multi-channel control is realized, the voltage control signal is converted into an analog output signal through a DAC module, the brightness of an LED light source is regulated through a driving chip, voltage driving control is realized, the brightness of the LED light source is regulated according to the PWM signal, PWM signal control is realized, the current signal or the voltage signal is input into an LED control module, and the brightness of the LED light source is regulated through the LED control module. The invention realizes multichannel control, and realizes adjustment of numerical values through the upper computer, thereby being capable of accurately controlling the luminous intensity and improving the control precision of the light source.
Drawings
For a clearer description of embodiments of the invention or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a multi-channel adjustable control system provided by the present invention;
fig. 2 is a flowchart of a first embodiment of a method for controlling a multi-channel adjustable light source according to the present invention.
Detailed Description
The core of the invention is to provide a multichannel adjustable light source control system and a control method, wherein the control signal is divided into a plurality of channel controls by a singlechip by utilizing the accurate control value of an upper computer, so that the accurate control of the multichannel controls is realized.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a block diagram of a multi-channel adjustable control system provided by the present invention, and the specific structure is as follows:
the LED driving chip receives an analog voltage signal or a PWM signal as a control signal to adjust the brightness of the LED light source;
the second channel takes an LED control module as an adjusting mode of the LED light source, and the LED control module receives a modulation voltage or a modulation current as a control signal to adjust the brightness of the LED light source.
The upper computer is provided with an input interface and is used for inputting an adjusting value, wherein the adjusting value comprises a voltage value, a current value and a PWM wave value.
The singlechip is connected with the upper computer through a USB serial port, and generates corresponding digital voltage signals, current signals and PWM signals according to the regulating values input by the upper computer, wherein the PWM signals are output to the first channel, and the current signals are output to the second channel.
The DAC module is connected to the singlechip, converts the digital voltage signal of the singlechip into an analog voltage signal and outputs the analog voltage signal to the first channel and the second channel respectively.
And the LED lamp group is used for controlling the light emission according to the LED driving chip and the LED control module.
And one end of the switching module is connected with the first channel output end and the second channel output end, and the other end of the switching module is connected with the LED lamp group and used for switching the control channel. The switching module is used for adjusting and using different control channels.
The multi-channel adjustable control system can control a plurality of groups of LEDs simultaneously, and ensures that each group of LED light sources has the same illumination intensity.
The singlechip comprises: STM32F102C6T6, STM32F103C6T6A.
The DAC module employs DAC chips TL5649, TL3931.
The LED driving chip comprises MBI6656, SB42511 and LM3402.
The second channel further comprises: the current control module receives a current signal output by the singlechip to drive the LM36011 to output different constant currents, the negative electrode of the operational amplifier LM2902N is connected with a grounding resistor, the drain of the N-channel MOS tube 2SK3669 is connected with the negative electrode of the operational amplifier to form negative feedback, the source of the MOS tube is grounded, the whole structure of the current source is a constant current source, and the current of the loop is regulated to achieve the brightness of the current control LED lamp by regulating the voltage of the input end of the operational amplifier.
The LED control module is a comparator formed by a voltage output connected with an operational amplifier OPA2140 and ground, the operational amplifier output is connected with a gate electrode of a mos (MBF 4393LT 1) tube, a source electrode is grounded, and a drain electrode is connected in an LED loop, so that the on-off of the LED loop is controlled to control the LED; the LED and the power supply are connected in series in a current control loop, so that the current control LED is achieved.
In this embodiment, the upper computer is utilized to send out a control signal, the control signal is divided into a voltage control signal, a current control signal and a PWM wave control signal through the singlechip, and is divided into a plurality of control channels, so that multi-channel control is realized, the voltage control signal is converted into an output analog signal through the DAC module, the LED lamp group is driven to emit light through the driving module, voltage control is realized, the LED lamp group is driven to emit light according to the difference of the duty ratio of PWM waves, PWM wave control is realized, and the LED lamp group is controlled to emit light through the current control module according to the current control signal. The invention realizes multichannel control, realizes adjustment value through the upper computer, can accurately control the luminous intensity, improves the control precision of the light source, and can reach 1mV,0.1mA and 1% duty ratio with minimum adjustment voltage.
Referring to fig. 2, fig. 2 is a flowchart of a first embodiment of a method for controlling a multi-channel adjustable light source according to the present invention; the specific operation steps are as follows:
step S201: setting an illumination intensity control signal;
step S202: inputting the illumination intensity control signal into a singlechip, and dividing the illumination intensity control signal into a digital voltage signal, a current signal and a PWM signal by using the singlechip;
step S203: converting the digital voltage signal into an analog output voltage using a DAC module;
step S204: inputting the analog output voltage or the PWM signal into an LED driving chip, and adjusting the brightness of an LED light source by using the LED driving chip;
step S205: and inputting the current signal or the analog output voltage into an LED control module, and adjusting the brightness of the LED light source by using the LED control module.
1. The single-chip microcomputer STM32F102C6T6 and the serial port chip ST3232ECTR are communicated with the upper computer, and voltage and current are set for the upper computer
2. The singlechip and the DAC chip TL5649 are communicated with each other to input digital quantity, and output analog voltage is amplified by the amplifier to reach voltage output of 0V-10V.
The LED driving module controls the LED lamp beads through the output voltage of an LED driving chip MBI6656, the MBI6656 is divided into two control modes, one mode is to adjust the input voltage to achieve the control output, the brightness of the LED lamp is adjusted through the DAC output analog voltage, the other mode is to control the output through the adjustment of the duty ratio of the input PWM wave, and the brightness of the LED lamp is adjusted through the output of the PWM wave with the adjustment of the duty ratio of the single chip microcomputer.
4. The negative electrode of the operational amplifier is connected with the grounding resistor, the drain electrode of the N-channel MOS tube is connected with the negative electrode of the operational amplifier to form negative feedback, the source electrode of the MOS tube is connected with electricity to form a constant current source as a whole, and the current of the loop is adjusted by adjusting the voltage of the input end of the operational amplifier to control the brightness of the LED lamp.
The LED control module is a comparator formed by a voltage output connected with an operational amplifier and ground, the output of the operational amplifier is connected with the gate electrode of a mos tube, the source electrode of the operational amplifier is grounded, and the drain electrode of the operational amplifier is connected in an LED loop, so that the on-off of the LED loop is controlled to control the LED; the LED and the power supply are connected in series in a current control loop, so that the current control LED is achieved.
In the present embodiment, multichannel control is realized, and the control accuracy is high. Firstly, a signal required to be controlled is input by an upper computer, a control signal is divided into a digital voltage signal, a current signal and a PWM signal through a singlechip, the control signal is divided into a plurality of control channels, multi-channel control is realized, the voltage control signal is converted into an analog output signal through a DAC module, the brightness of an LED light source is regulated through a driving chip, voltage driving control is realized, the brightness of the LED light source is regulated according to the PWM signal, PWM signal control is realized, the current signal or the voltage signal is input into an LED control module, and the brightness of the LED light source is regulated through the LED control module. The invention realizes multichannel control, and realizes adjustment of numerical values through the upper computer, thereby being capable of accurately controlling the luminous intensity and improving the control precision of the light source. Improved accuracy and efficiency of optical testing.
The embodiment of the invention also provides a multichannel adjustable light source control device, which comprises: a memory for storing a computer program; and the processor is used for realizing the steps of the multi-channel adjustable light source control method when executing the computer program.
The specific embodiment of the invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the steps of the multi-channel adjustable light source control method when being executed by a processor.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The invention provides a multichannel adjustable light source control system and a control method. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (9)
1. A multi-channel adjustable light source control system, comprising:
the LED driving chip receives an analog voltage signal or a PWM signal as a control signal to adjust the brightness of the LED light source;
the second channel takes an LED control module as an adjusting mode of the LED light source, and the LED control module receives an analog voltage signal or a modulation current as a control signal to adjust the brightness of the LED light source;
the upper computer is provided with an input interface and is used for inputting an adjusting value, wherein the adjusting value comprises a voltage value, a current value and a PWM wave value;
the singlechip is connected with the upper computer through a USB serial port, and generates corresponding digital voltage signals, current signals and PWM signals according to the regulating values input by the upper computer, wherein the PWM signals are output to the first channel, and the current signals are output to the second channel;
the DAC module is connected to the singlechip, converts the digital voltage signal of the singlechip into an analog voltage signal and outputs the analog voltage signal to the first channel and the second channel respectively;
the LED lamp group is used for controlling the light emission according to the LED driving chip and the LED control module;
and one end of the switching module is connected with the first channel output end and the second channel output end, and the other end of the switching module is connected with the LED lamp group and used for switching the control channel.
2. The multi-channel adjustable light source control system of claim 1 wherein the single chip microcomputer comprises: STM32F102C6T6, STM32F103C6T6A.
3. The multi-channel adjustable light source control system of claim 1 wherein the DAC module employs DAC chips TL5649, TL3931.
4. The multi-channel adjustable light source control system of claim 1 wherein the LED driver chip comprises MBI6656, SB42511, LM3402.
5. The multi-channel adjustable light source control system of claim 4 wherein the LED driver chip comprises a voltage control channel and a PWM wave control channel.
6. The multi-channel adjustable light source control system of claim 5 wherein the voltage control channel comprises:
and controlling the output of the LED driving chip according to the output analog voltage, and adjusting the brightness of the LED light source.
7. The multi-channel adjustable light source control system of claim 5 wherein the PWM wave control channel comprises:
and controlling the output of the LED driving chip according to the PWM wave duty ratio, and adjusting the brightness of the LED light source.
8. A method of controlling a multi-channel adjustable light source, comprising:
setting an illumination intensity control signal;
inputting the illumination intensity control signal into a singlechip, and dividing the illumination intensity control signal into a digital voltage signal, a current signal and a PWM signal by using the singlechip;
converting the digital voltage signal into an analog output voltage using a DAC module;
inputting the analog output voltage or the PWM signal into an LED driving chip, and adjusting the brightness of an LED light source by using the LED driving chip;
and inputting the current signal or the analog output voltage into an LED control module, and adjusting the brightness of the LED light source by using the LED control module.
9. Use of a multi-channel adjustable light source control method according to claim 8 in an optical test system.
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