CN115633420A - Multi-channel adjustable light source control system and control method - Google Patents
Multi-channel adjustable light source control system and control method Download PDFInfo
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- CN115633420A CN115633420A CN202211212912.6A CN202211212912A CN115633420A CN 115633420 A CN115633420 A CN 115633420A CN 202211212912 A CN202211212912 A CN 202211212912A CN 115633420 A CN115633420 A CN 115633420A
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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
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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]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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
- 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
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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
- 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]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a multi-channel adjustable light source control system and a control method, which comprises the following steps: the LED light source control system has the advantages that signals required to be controlled are input through the upper computer, control signals are divided into digital voltage signals, current signals and PWM signals through the single chip microcomputer and are divided into a plurality of control channels, multi-channel control is achieved, 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 achieved, the PWM signal control is achieved according to the brightness of the LED light source adjusted through the PWM signals, 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 multi-channel control, realizes numerical value adjustment through the upper computer, can accurately control the luminous intensity and improve 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 multi-channel adjustable light source control system and a control method.
Background
In the prior art, in the processes of camera AA, calibration, flare test and the like, a test graphic card needs to be used, and the test graphic card needs to be illuminated by a light source. In practical use, the light source needs to be stabilized and the brightness of the light source needs to be adjusted in multiple stages, and in a scene with multiple light sources, the brightness of light needs to be adjusted manually, so that the adjustment resolution is low, offline operation is performed, the number of channels is small, and the error of an output value is large. And the adjusting channel is single, and cannot be used when the adjusting channel fails.
In conclusion, it can be seen that how to implement multi-channel regulation is a problem to be solved at present.
Disclosure of Invention
The invention aims to provide a multi-channel 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.
To solve the above technical problem, the present invention provides a multi-channel adjustable light source control system, comprising:
the first channel takes an LED driving chip as an adjusting mode of an LED light source, and 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 adjusting values, and the adjusting values comprise voltage values, current values and PWM wave values;
the single chip microcomputer 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 adjusting 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;
and the DAC module is connected to the singlechip, converts the digital voltage signal of the singlechip into an analog voltage signal and respectively outputs the analog voltage signal to the first channel and the second channel.
Preferably, the method further comprises the following steps:
the LED lamp bank is used for controlling light emission according to the LED driving chip and the LED control module;
and one end of the switching module is connected with the output end of the first channel and the output end of the second channel, and the other end of the switching module is connected with the LED lamp bank and used for switching the control channel.
Preferably, the single chip microcomputer includes: STM32F102C6T6, STM32F103C6T6A.
Preferably, the DAC module adopts DAC chips TL5649 and 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 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.
Preferably, the PWM wave control channel includes:
and controlling the output of the LED driving chip according to the PWM wave ratio, and adjusting the brightness of the LED light source.
The invention also provides a control method of the multichannel adjustable light source, which comprises the following steps:
setting an illumination intensity control signal;
inputting the illumination intensity control signal into a single chip microcomputer, and dividing the illumination intensity control signal into a digital voltage signal, a current signal and a PWM signal by using the single chip microcomputer;
converting the digital voltage signal into an analog output voltage by 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 invention also provides an application of the multi-channel adjustable light source control method in an optical test system.
The invention provides a multi-channel adjustable light source control system and a control method, which are provided with a plurality of control channels to realize flexible control, firstly, signals required to be controlled are input by an upper computer, control signals are divided into digital voltage signals, current signals and PWM signals through a single chip microcomputer and are divided into a plurality of control channels to realize multi-channel control, the voltage control signals are converted into analog output signals through a DAC module, the brightness of an LED light source is adjusted through a driving chip to realize voltage driving control, the brightness of the LED light source is adjusted according to the PWM signals to realize PWM signal control, the current signals or the voltage signals are input into an LED control module, and the brightness of the LED light source is adjusted through the LED control module. The invention realizes multi-channel control, adjusts the numerical value through the upper computer, can accurately control the luminous intensity and improve the control precision of the light source.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
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 multi-channel adjustable light source control system and a control method, an upper computer is used for accurately controlling numerical values, and a control signal is divided into multiple channels through a single chip microcomputer for control, so that accurate control of multi-channel control is realized.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present 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 first channel takes an LED driving chip as an adjusting mode of an LED light source, and 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;
and 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 adjusting values, and the adjusting values comprise voltage values, current values and PWM wave values.
The single chip microcomputer is connected with the upper computer through a USB serial port, and generates corresponding digital voltage signals, current signals and PWM signals according to 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.
And the DAC module is connected to the singlechip, converts the digital voltage signal of the singlechip into an analog voltage signal and respectively outputs the analog voltage signal to the first channel and the second channel.
And the LED lamp bank is used for controlling light emission according to the LED driving chip and the LED control module.
And one end of the switching module is connected with the output end of the first channel and the output end of the second channel, and the other end of the switching module is connected with the LED lamp bank and used for switching the control channel. And regulating to use different control channels by using a switching module.
The multi-channel adjustable control system can simultaneously control a plurality of groups of LEDs and ensure that the light sources of each group of LEDs have the same illumination intensity.
The singlechip comprises: STM32F102C6T6, STM32F103C6T6A.
The DAC module adopts DAC chips TL5649 and TL3931.
The LED driving chip comprises MBI6656, SB42511 and LM3402.
The second channel further comprises: the LED lamp comprises a current control module and an operational amplifier unit, wherein the current control module receives a current signal output by a single chip microcomputer to drive an LM36011 to output different constant currents, the negative electrode of an operational amplifier LM2902N is connected with a grounding resistor, a missing memory of an N-channel MOS tube 2SK3669 is connected with the negative electrode of the operational amplifier to form a negative feedback, the source electrode of the MOS tube is grounded, the whole body forms a constant current source, and the current of a loop is adjusted by adjusting the voltage of the input end of the operational amplifier unit to achieve the current control of the brightness of the LED lamp.
The LED control module is a comparator consisting of a voltage output, an operational amplifier OPA2140 and the ground, the operational amplifier output is connected with a mos (MBF 4393LT 1) tube gate, a source electrode is grounded, and a drain is connected in an LED loop, so that the LED loop is controlled to be switched on and off to control the LED; the LED and the power supply string are arranged in the current control loop, so that the current control of the LED is realized.
In this embodiment, the upper computer is used for sending out a control signal, the control signal is divided into a voltage control signal, a current control signal and a PWM (pulse width modulation) wave control signal through the single chip microcomputer, the control signal is divided into a plurality of control channels, multi-channel control is realized, the voltage control signal is converted into an output analog signal through the DAC (digital-to-analog converter) module, the LED lamp bank is driven by the driving module to emit light, voltage control is realized, the LED lamp bank is driven to emit light according to different PWM wave duty ratios, PWM wave control is realized, and the current control of the LED lamp bank is realized through the current control module according to the current control signal. The invention realizes multi-channel control, realizes the adjustment of numerical values through the upper computer, can accurately control the luminous intensity, improves the control precision of a light source, and can achieve the minimum adjustment voltage of 1mV,0.1mA and 1% duty ratio.
Referring to fig. 2, fig. 2 is a flowchart illustrating a control method of a multi-channel adjustable light source according to a first embodiment of 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 single chip microcomputer, and dividing the illumination intensity control signal into a digital voltage signal, a current signal and a PWM signal by using the single chip microcomputer;
step S203: converting the digital voltage signal into an analog output voltage by 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. Through communication between the single chip microcomputer STM32F102C6T6 and the serial port chip ST3232ECTR and the upper computer, voltage and current are set for the upper computer
2. The singlechip and the DAC chip TL5649 are communicated to input digital quantity, and output analog voltage is amplified by an amplifier to reach 0-10V voltage for output.
LED drive module is through LED driver chip MBI6656 output voltage control LED lamp pearl, and MBI6656 divide into two kinds of control mode again, and one kind has reached control output for adjusting input voltage, and this scheme adjusts the luminance of LED lamp through DAC output analog voltage, and another kind is for the duty ratio control output through the adjustment input PWM ripples, and this scheme adjusts the luminance of LED lamp through the PWM ripples of singlechip output adjustment duty ratio.
4. The negative electrode of the operational amplifier is connected with a 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 integrally form a constant current source, 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 by current.
The LED control module is a comparator consisting of a voltage output, an operational amplifier and a ground, wherein the output of the operational amplifier is connected with a gate pole of the mos tube, a source pole of the mos tube is grounded, and a drain of the mos tube is connected in an LED loop, so that the LED is controlled by controlling the on-off of the LED loop; the LED and the power supply string are arranged in the current control loop, so that the current control of the LED is realized.
In the present embodiment, multi-channel control is realized, and the control accuracy is high. The LED light source control method includes the steps that firstly, signals needing to be controlled are input through an upper computer, control signals are divided into digital voltage signals, current signals and PWM signals through a single chip microcomputer and are divided into a plurality of control channels, multi-channel control is achieved, the voltage control signals are converted into analog output signals through a DAC (digital-to-analog converter) module, the brightness of an LED light source is adjusted through a driving chip, voltage driving control is achieved, the brightness of the LED light source is adjusted according to the PWM signals, PWM signal control is achieved, 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 multi-channel control, realizes numerical value adjustment through the upper computer, can accurately control the luminous intensity and improve the control precision of the light source. Improved accuracy and efficiency of optical testing.
The specific embodiment of the present invention further provides a multi-channel adjustable light source control device, including: a memory for storing a computer program; a processor for implementing the steps of the above-described method of multi-channel adjustable light source control when executing the computer program.
Embodiments of the present invention further provide a computer-readable storage medium having a computer program stored thereon, where the computer program, when executed by a processor, implements the steps of the above-mentioned method for controlling a multi-channel adjustable light source.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
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 components and steps have been described above generally in terms of their functionality in order to clearly illustrate this 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 technical 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. A software module may reside 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 present invention provides a multi-channel adjustable light source control system and a control method thereof. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A multi-channel adjustable light source control system, comprising:
the first channel takes an LED driving chip as an adjusting mode of the LED light source, and 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 adjusting values, and the adjusting values comprise voltage values, current values and PWM wave values;
the single chip microcomputer 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 adjusting 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;
and the DAC module is connected to the singlechip, converts the digital voltage signal of the singlechip into an analog voltage signal and respectively outputs the analog voltage signal to the first channel and the second channel.
2. The multi-channel adjustable luminaire control system of claim 1 further comprising:
the LED lamp bank is used for controlling light emission according to the LED driving chip and the LED control module;
and one end of the switching module is connected with the output end of the first channel and the output end of the second channel, and the other end of the switching module is connected with the LED lamp bank and used for switching the control channel.
3. The multi-channel adjustable light source control system of claim 1, wherein the single-chip microcomputer comprises: STM32F102C6T6, STM32F103C6T6A.
4. The multi-channel adjustable light source control system of claim 1, wherein the DAC module employs DAC chips TL5649, TL3931.
5. The multi-channel adjustable light source control system of claim 1, wherein the LED driving chip comprises MBI6656, SB42511, LM3402.
6. The multi-channel adjustable light source control system of claim 5 wherein the LED driver chips comprise a voltage control channel and a PWM wave control channel.
7. The multi-channel adjustable luminaire control system of claim 6, 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.
8. The multi-channel adjustable luminaire control system of claim 6 wherein the PWM wave control channels comprise:
and controlling the output of the LED driving chip according to the PWM wave ratio, and adjusting the brightness of the LED light source.
9. A method for controlling a multi-channel adjustable light source, comprising:
setting an illumination intensity control signal;
inputting the illumination intensity control signal into a single chip microcomputer, and dividing the illumination intensity control signal into a digital voltage signal, a current signal and a PWM signal by using the single chip microcomputer;
converting the digital voltage signal into an analog output voltage by 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.
10. Use of a method of controlling a multichannel adjustable light source according to claim 9 in an optical test system.
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