WO2020192694A1

WO2020192694A1 - Led light source control device and method, light source assembly and photoelectric pulse detection device

Info

Publication number: WO2020192694A1
Application number: PCT/CN2020/081142
Authority: WO
Inventors: 唐明; 陈建强; 欧阳威; 张小东
Original assignee: 深圳市杰普特光电股份有限公司
Priority date: 2019-03-27
Filing date: 2020-03-25
Publication date: 2020-10-01
Also published as: CN110113835B; CN110113835A

Abstract

The present application relates to an LED light source control device and method, a light source assembly and a photoelectric pulse detection device. The LED light source control device is used to control an LED light source, and the LED light source comprises a plurality of LED lights. The LED light source control device comprises a plurality of constant current drive modules and a control module. The plurality of constant current drive modules are respectively electrically connected to the plurality of LED lights for driving the plurality of LED lights. The control module comprises a uniformity processing module and a current control module. The uniformity processing module is electrically connected to the current control module, and the current control module is electrically connected to the plurality of constant current drive modules. The uniformity processing module is used to receive a uniformity parameter of the LED light source, and determine drive current adjustment solutions for the plurality of LED lights according to the uniformity parameter. The current control module is used to adjust the drive currents of the plurality of LED lights according to the drive current adjustment solutions. The LED light source control device of the present application can improve the uniformity of an LED light source.

Description

LED light source control device, method, light source assembly and photoelectric pulse detection device

Technical field

This application relates to the field of LEDs, in particular to an LED light source control device, method, light source assembly and photoelectric pulse detection device.

Background technique

LED (Light Emitting Diode, light-emitting diode) is a semiconductor electronic component that can convert electrical energy into light energy. With the continuous advancement of technology, LEDs have been widely used in displays, televisions, lighting decoration and lighting.

The LED light source generally includes multiple LED lights. Brightness uniformity is an important indicator of LED light sources. The LED light source in the traditional technology has the problem of poor brightness uniformity due to inconsistencies in installation positions, driving voltages or currents.

Summary of the invention

Based on this, it is necessary to provide an LED light source control device, method, light source assembly, and photoelectric pulse detection device for the above problems.

An LED light source control device is used to control an LED light source, the LED light source includes a plurality of LED lamps, and the LED light source control device includes:

A plurality of constant current drive modules are respectively electrically connected to the plurality of LED lamps for driving the plurality of LED lamps;

The control module includes a uniformity processing module and a current control module, the uniformity processing module is electrically connected to the current control module, and the current control module is electrically connected to the plurality of constant current drive modules respectively; The uniformity processing module is used for receiving the uniformity parameters of the LED light source, and determining the driving current adjustment scheme for the plurality of LED lamps according to the uniformity parameters; the current control module is used for adjusting according to the driving current The solution adjusts the driving current of the plurality of LED lamps.

In one of the embodiments, the control module further includes:

A synchronous drive control module, the current control module is electrically connected to the plurality of constant current drive modules through the drive control module, and the synchronous drive control module is used to control the drive currents of the plurality of LED lamps respectively The multiple constant current drive modules work synchronously.

In one of the embodiments, the constant current drive module includes:

A constant current control module, electrically connected to the LED lamp;

A digital-to-analog conversion module, which is electrically connected to the constant current control module and the synchronous drive control module, and is used to convert a digital signal into an analog signal;

The LED light source control device also includes a plurality of analog-to-digital conversion modules, which are respectively electrically connected to the plurality of constant current control modules, and are electrically connected to the synchronous drive control module, for converting analog signals into digital signals.

In one of the embodiments, the LED light source control device further includes:

The thermostat is arranged at the bottom of the LED light source and is used to adjust the temperature of the LED light source and keep the temperature of the LED light source constant.

In one of the embodiments, the thermostat includes:

The temperature adjustment component is arranged at the bottom of the LED light source and is used to adjust the temperature of the LED light source;

The temperature detection component is arranged at the bottom of the LED light source for detecting the temperature of the LED light source;

A temperature adjustment drive module, which is electrically connected to the temperature adjustment component;

The control module further includes a temperature control module, the temperature control module is electrically connected to the temperature adjustment driving module and the temperature detection component;

The temperature control module is configured to output a control signal to the temperature adjustment driving module according to the preset temperature and the temperature detected by the temperature detection component;

The temperature adjustment driving module is used for driving the temperature adjustment component to work according to the control signal output by the temperature control module, so that the temperature of the LED light source remains constant.

Photoelectric detection device, used to detect the light intensity signal of the LED light source and convert it into the light intensity electrical signal;

The control module also includes a light intensity alarm module, which is electrically connected to the photoelectric detection device, and the light intensity alarm module is used to compare the light intensity electrical signal with a preset threshold value, when the When the light intensity electric signal is greater than the preset threshold value, an alarm signal is output.

An LED light source assembly, including:

LED light source, including multiple LED lights;

LED light source control device, including multiple constant current drive modules, control modules and constant temperature devices;

The plurality of constant current drive modules are respectively electrically connected with the plurality of LED lamps, and are used to drive the plurality of LED lamps;

The thermostat is arranged at the bottom of the LED light source, and is used to adjust the temperature of the LED light source and keep the temperature of the LED light source constant;

The control module includes a uniformity processing module, a current control module, and a synchronous drive control module. The uniformity processing module is electrically connected to the current control module. The uniformity processing module is used to receive the uniformity of the LED light source. And determine the driving current adjustment scheme for the plurality of LED lamps according to the uniformity parameter; the current control module is electrically connected to the plurality of constant current driving modules through the driving control module, so The current control module is used to adjust the driving current of the plurality of LED lamps according to the driving current adjustment scheme; the synchronous driving control module is used to control the plurality of constant currents respectively according to the driving current of the plurality of LED lamps The drive modules work synchronously.

A photoelectric pulse detection device includes the above-mentioned LED light source assembly.

The LED light source control device, the LED light source assembly, and the photoelectric pulse detection device provided by the embodiments of the present application include the plurality of constant current drive modules and the control module. The plurality of constant current drive modules are respectively electrically connected with the plurality of LED lamps to realize individual driving of the plurality of LED lamps. The driving of each LED lamp is not affected by other LED lamps, which improves the stability of the LED light source. The control module includes a uniformity processing module and the current control module. The uniformity processing module receives the uniformity parameter, and determines a driving current driving scheme for the plurality of LED lamps according to the uniformity parameter. The current control module adjusts the driving current of the plurality of LED lamps according to the driving current adjustment scheme, thereby respectively adjusting the light intensity of the LED lamps, so as to achieve uniform light output from the LED light source. The LED light source control device, the LED light source assembly, and the photoelectric pulse detection device provided by the embodiments of the present application can effectively improve the uniformity of the LED light source and improve the light output effect of the LED light source.

An LED light source control method for controlling an LED light source, the LED light source includes a plurality of LED lights, and the method includes:

Acquiring a uniformity parameter of the LED light source, the uniformity parameter characterizing the uniformity of the light intensity of the LED light source;

Determining a driving current adjustment scheme for the plurality of LED lamps according to the uniformity parameter, wherein the driving current adjustment scheme includes the number and adjustment value of the LED lamp whose driving current needs to be adjusted;

Adjusting the driving current of the plurality of LED lamps according to the driving current adjustment scheme.

In one of the embodiments, the determining a driving current adjustment scheme for the plurality of LED lamps according to the uniformity parameter includes:

Determine the light intensity of each LED lamp according to the uniformity parameter;

Determining the driving current adjustment scheme according to the light intensity of each LED lamp;

Comparing the light intensity of each LED lamp with a corresponding preset light intensity threshold;

When the light intensity of the LED lamp is not equal to the corresponding preset light intensity threshold, the number of the LED lamp is obtained, and according to the light intensity of the LED lamp and the corresponding preset light intensity threshold, Determine the adjustment value of the LED light.

The method provided in the embodiment of the present application obtains the uniformity parameter of the LED light source, and determines the driving current adjustment scheme for the plurality of LED lamps according to the uniformity parameter. Further adjusting the driving current of the plurality of LED lamps according to the driving current adjustment scheme, so that the light output intensity of each LED lamp in the LED light source can be adjusted in real time, so that the LED light source emits light uniformly and improves the light output effect.

Description of the drawings

FIG. 1 is a schematic structural diagram of an LED light source control device provided by an embodiment of the application;

2 is a schematic diagram of the structure of an LED light source control device provided by an embodiment of the application;

FIG. 3 is a circuit diagram of a constant current control module provided by an embodiment of the application;

4 is a circuit diagram of a digital-to-analog conversion module provided by an embodiment of the application;

FIG. 5 is a circuit diagram of an analog-to-digital conversion module provided by an embodiment of the application;

FIG. 6 is a circuit diagram of a temperature regulation driving module provided by an embodiment of the application;

FIG. 7 is a schematic flowchart of steps of a method for controlling an LED light source according to an embodiment of the application;

FIG. 8 is a schematic flowchart of steps for determining a driving current adjustment scheme for the plurality of LED lamps according to the uniformity parameter according to an embodiment of the application;

FIG. 9 is a schematic flow chart of the steps of determining the driving current adjustment scheme according to the light intensity of each LED lamp according to an embodiment of the application.

Description of reference signs

LED light source control device 10

Constant current drive module 100

Constant current control module 110

Digital-to-analog conversion module 120

Control module 200

Uniformity processing module 210

Current control module 220

Synchronous drive control module 230

Temperature control module 240

Light intensity alarm module 250

Analog-to-digital conversion module 300

Thermostat device 400

Temperature adjustment components 410

Temperature detection component 420

Temperature control drive module 430

Photoelectric detection device 500

LED light source 20

LED lights 21

detailed description

In order to make the purpose, technical solutions, and advantages of this application clearer and clearer, the following examples are used in conjunction with the accompanying drawings to further describe this application in detail. It should be understood that the specific embodiments described herein are only used to explain the application, and not used to limit the application.

The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequence or technical meaning. The "connection" and "connection" mentioned in this application include direct and indirect connection (connection) unless otherwise specified. In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", The orientation or positional relationship indicated by "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description , Rather than indicating or implying that the pointed device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the application.

In this application, unless expressly stipulated and defined otherwise, the “on” or “under” of the first feature on the second feature may be in direct contact with the first and second features, or indirectly through an intermediary. contact. Moreover, the "above", "above" and "above" of the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the level of the first feature is higher than the second feature. The “below”, “below” and “below” of the second feature of the first feature may mean that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

The embodiment of the present application provides an LED light source control device 10 and an LED light source assembly. In one embodiment, the LED light source control device 10 and the LED light source assembly may be applied to a photoelectric pulse detection device. The photoelectric pulse detection device is used to detect the pulse of the human body, so as to reflect the heart rate of the human body. The photoelectric pulse detection device mainly includes an LED light source assembly and a photoelectric detector (Photoelectric Detector, hereinafter referred to as PD). The principle of the photoelectric pulse detection device for detecting the pulse is mainly that the LED light source assembly emits light and irradiates the arterial blood. The light is reflected by the arterial blood to the PD. The pulse condition can be calculated by the light intensity received by the PD. The photoelectric pulse detection device can be used alone or integrated into wearable electronic devices such as smart bracelets and smart wristbands.

Based on the principle of pulse detection by the photoelectric pulse detection device, whether the light emitted by the LED light source assembly used in the photoelectric pulse detection device is uniform is of vital importance to the accuracy of pulse detection. Therefore, the LED light source control device 10 and the LED light source assembly provided by the embodiments of the present application are applied to the photoelectric pulse detection device, the smart bracelet with pulse detection function, smart wristband, etc., which can effectively improve The accuracy of pulse detection.

In one embodiment, the LED light source control device 10 and the LED light source assembly may also be applied to the detection of PD array functions. The LED light source control device 10 controls the LED light source to emit uniform light and project it onto the PD array. The photoelectric effect of the PD array converts the projected light signals into electrical signals. The later-stage acquisition system collects electrical signals and judges the strength of the collected electrical signals to judge the performance of the PD array. The use of a light source capable of generating uniform light to detect the function of the PD array can effectively eliminate the influence of the light source on the strength of the collected signal and improve the accuracy of the detection.

In one embodiment, the LED light source control device 10 and the LED light source can also be used to test the uniformity of light transmission of light-transmitting materials, such as glass lenses, to improve the accuracy of detection.

In some other embodiments, the LED light source assembly can also be used as a light source of an industrial camera (CDD) to improve the shooting effect of the camera.

The LED light source control device 10 and the LED light source assembly will be further described below in conjunction with specific embodiments.

Referring to FIG. 1, in an embodiment, the LED light source control device 10 is used to control the LED light source 20. The LED light source 20 includes a plurality of LED lamps 21. The number of the LED lights 21 is not limited. The plurality of LED lights 21 may be arranged on a PCB board. The arrangement and the shape of the plurality of LED lights 21 are not limited either, and may be a circular array or a directional array.

The LED light source control device 10 includes a plurality of constant current drive modules 100 and control modules 200. Wherein, the control module 200 includes a uniformity processing module 210 and a current control module 220.

The plurality of constant current driving modules 100 are electrically connected to the plurality of LED lamps 21 respectively. The uniformity processing module 210 is electrically connected to the current control module 220. The current control module 220 is electrically connected to the plurality of constant current driving modules 100 respectively.

The number of the constant current drive modules 100 is the same as the number of the LED lights 21. The constant current driving module 100 is used to drive the LED lamp 21 to light up with a constant current. The structure of the constant current module 100 is not specifically limited, and can be selected according to actual needs.

The uniformity processing module 210 is configured to receive the uniformity parameter of the LED light source 20 and determine the driving current adjustment scheme of the plurality of LED lamps 21 according to the uniformity parameter. Wherein, the uniformity parameter is used to characterize the uniformity of the light intensity of the LED light source 20. For example, the LED light source 20 is a 2×10 matrix formed by 20 LED lamps 21. The 20 LED lights 21 emit light at the same time, and the final light-emitting effect is displayed. Since the light intensity numbered (1,1), (1,5), (2,1) in the matrix is relatively weak, the uniformity parameter is A . The uniformity parameter may be an image parameter, or a digital parameter, and may also be any other parameter that can characterize the difference in the intensity of the LED lights. The uniformity parameter may be obtained through detection by a device for detecting the uniformity parameter, and transmitted to the uniformity processing module. The uniformity parameter may also be detected by manual visual inspection or a manual handheld device to detect the uniformity of the LED light source 20, and input into the uniformity processing module 210 through a keyboard or the like. Specifically, the method for obtaining the uniformity parameter and the expression form of the uniformity parameter are not limited in this application. The driving current adjustment scheme refers to the adjustment of the driving current of each LED lamp 21 according to the uniformity parameter. The driving current adjustment scheme includes, but is not limited to: whether the LED lamp 21 needs to be adjusted, the number of the LED lamp 21 whose driving current needs to be adjusted, and the driving current adjustment value of the LED lamp 21 whose driving current needs to be adjusted . For example, the driving current adjustment scheme obtained according to the uniformity parameter is: the LED lights 21 numbered (1, 1) and numbered (2, 1) need to be adjusted; The adjustment value of the driving current of the LED lamp 21 in) is +2 mA, and the adjustment value of the driving current of the LED lamp 21 numbered (2, 1) is +1 mA.

The current control module 220 is configured to adjust the driving current of the plurality of LED lamps 21 according to the driving current adjustment scheme. The current control module 220 is directly or indirectly electrically connected to each of the constant current driving modules 100 and sends the adjusted driving current to each of the LED lights 21 correspondingly. The constant current driving module 100 drives the corresponding LED lamp 21 to light up with this driving current.

The uniformity processing module 210 and the current control module 220 can be implemented by a hardware circuit, or can be implemented by a combination of a chip or the like with a software program. The uniformity processing module 210 and the current control module 220 may be provided separately, or may be integrated to form an integrated structure. In a specific embodiment, the functions of the uniformity processing module 210 and the current control module 220 are implemented by programming a Microcontroller Unit (MCU). The MCU can include multiple pins and interfaces. The MCU is connected to the plurality of constant current drive modules 100 and other modules or devices through pins and interfaces.

The working process of the LED light source control device 10 is as follows: the uniformity processing module 210 receives the uniformity processing module 210 and performs calculation processing in a preset manner to determine the driving of the plurality of LED lamps 21 Current adjustment scheme. The uniformity processing module 210 transmits the driving current adjustment scheme to the plurality of constant current driving modules 100. The plurality of constant current driving modules 100 drive the plurality of LED lights 21 to light up. The LED light source control device 10 repeats the above process and continuously adjusts the driving current to adjust the brightness of each LED lamp 21, so that the light emitted by the plurality of LED lamps 21 is uniformly distributed in the effective area.

In this embodiment, the LED light source control device 10 includes the plurality of constant current drive modules 100 and the control module 200. The plurality of constant current driving modules 100 are respectively electrically connected to the plurality of LED lamps 21 to realize individual driving of the plurality of LED lamps 21. The driving of each LED lamp 21 is not affected by other LED lamps 21, which improves the stability of the LED light source 20. The control module 200 includes a uniformity processing module 210 and the current control module 220. The uniformity processing module 210 receives the uniformity parameter, and determines a driving current driving scheme for the plurality of LED lamps 21 according to the uniformity parameter. The current control module 220 adjusts the driving current of the plurality of LED lamps 21 according to the driving current adjustment scheme, thereby respectively adjusting the light intensity of the LED lamps 21, so as to achieve uniform light output of the LED light source 20. The LED light source control device 10 provided in this embodiment can effectively improve the uniformity of the LED light source 20 and improve the light output effect of the LED light source 20.

Referring to FIG. 2, in one embodiment, the control module 200 further includes a synchronous drive control module 230. The synchronous drive control module 230 is connected between the plurality of constant current drive modules 100 and the current control module 220. The output terminal of the current control module 220 is electrically connected to the input terminal of the synchronous drive control module 230. The output end of the synchronous drive control module 230 is electrically connected to the plurality of constant current drive modules 100. The synchronous driving control module 230 is configured to control the plurality of constant current driving modules 100 to operate synchronously according to the driving current of the plurality of LED lamps 21.

In an embodiment, the synchronous drive control module 230 may be a Field-Programmable Gate Array (FPGA). When the MCU implements the functions of the uniformity processing module 210 and the current control module 220, the executed code is a sequential loop, and the timeliness is not good. FPGA code can be executed in parallel with better timeliness. Therefore, FPGA can realize the synchronous lighting of a plurality of the LED lights 21. In addition, the time between when the MCU receives an instruction and executes the instruction is not fixed, while the time from when the FPGA receives the instruction to the execution of the instruction is fixed. Therefore, the operation of multiple LED lights 21 can be realized through FPGA. Synchronization.

In an embodiment, each of the constant current driving modules 100 includes a constant current control module 110 and a digital-to-analog conversion module 120. The input terminal of the digital-to-analog conversion module 120 is electrically connected to the output terminal of the constant current control module 110. The output terminal of the digital-to-analog conversion module 120 is connected to the input terminal of the constant current control module 110. The constant current control module 110 is electrically connected to the LED lamp 21. The digital-to-analog conversion module 120 is used for converting the driving current digital signal output by the synchronous driving control module 230 into a driving current analog signal. The constant current control module 110 is used for driving the LED lamp 21 according to the driving current analog signal. The specific circuit of the constant current control module 110 may include current negative feedback composed of a sampling resistor, an operational amplifier, and the like. The sampling resistor is used to collect the current current of the LED lamp 21 and feed it back to the operational amplifier. The operational amplifier adjusts the current of the LED lamp 21 in real time according to the current current of the LED lamp 21 and the driving current input by the digital-to-analog conversion module 120 to realize constant current driving. In one embodiment, the circuit diagram of the constant current control module 110 is shown in FIG. 3. The circuit diagram of the digital-to-analog conversion module 120 is shown in FIG. 4.

In an embodiment, the LED light source control device 10 further includes a plurality of analog-to-digital conversion modules 300. The input ends of the plurality of analog-to-digital conversion modules 300 are respectively electrically connected to the output ends of the plurality of constant current control modules 110. The output terminals of the plurality of analog-to-digital conversion modules 300 are electrically connected to the input terminals of the synchronous drive control module 230 respectively. The analog-to-digital conversion module 300 is configured to convert the current analog current signal of the LED lamp 21 collected by the sampling resistor in the constant current control module 110 into a digital current signal, and output to the synchronous drive control module 230. The synchronous drive control module 230 further transmits the digital current signal to the MCU. MCU can set the output port. The current output of the LED lamp 21 is displayed through the output port. In an embodiment, the circuit diagram of the analog-to-digital conversion module 300 is shown in FIG. 5.

Referring to FIG. 2, in one embodiment, the LED light source control device 10 further includes a thermostat 400. The thermostat 400 is arranged at the bottom of the LED light source 20. The thermostat 400 may be arranged at the bottom of the PCB board of the LED light source 20. The thermostat 400 is used to adjust the temperature of the bottom of the LED light source 20 to keep the temperature of the LED light source 20 constant, so that the plurality of LED lights 21 are not affected by the ambient temperature and maintain stable power. The stable power of the LED light source 20 is the basis of constant current driving and light output uniformity.

The specific structure of the thermostat 400 can be selected according to actual requirements. In one embodiment, the thermostat 400 includes a temperature adjustment component 410, a temperature detection component 420, and a temperature control part. The temperature control part is electrically connected to the temperature adjustment component 410 and the temperature detection component 420. The temperature adjustment component 410 and the temperature detection component 420 are both arranged at the bottom of the LED light source 20. The temperature adjustment component 410 is used to adjust the temperature of the LED light source 20. The temperature detection component 420 is used to detect the temperature of the LED light source 20. The temperature detection component 420 may be a temperature sensor, which is arranged on the PCB board of the plurality of LED lights 21. The temperature adjustment component 410 may have a certain area. The temperature adjustment component 410 can adjust the ambient temperature of the LED light source 20 by transferring heat or cooling to the PCB board of the LED lamp 21.

The temperature control part is used to control the current temperature of the LED light source 20 detected by the temperature detection component 420 to control the operation of the temperature adjustment component 410 so as to adjust the temperature of the LED light source 20. The temperature control part can be realized by a temperature control circuit, or by a chip and a program. In an embodiment, the control module 200 may further include a temperature control module 240. The temperature control module 240 is electrically connected to the temperature adjustment component and the temperature detection component 420. The temperature control module 240 is used for adjusting and controlling the operation of the temperature adjusting component 410 according to the preset temperature and the temperature detected by the temperature detecting component 420, so that the temperature of the LED light source 20 is maintained at the preset temperature. Keep the temperature constant.

One of the temperature adjustment components 410 is a semiconductor refrigerator. The temperature control module 240 controls the operation of the semiconductor refrigerator according to the temperature detected by the temperature detection component 420 and a preset temperature value. When the temperature detection component 420 detects that the current temperature of the LED light source 20 is higher than a preset temperature value, the temperature control module 240 controls the cooling of the semiconductor refrigerator. When the current temperature of the LED light source 20 detected by the temperature detection component 420 is lower than a preset temperature value, the temperature control module 240 controls the heating of the semiconductor refrigerator.

In an embodiment, the thermostat 400 further includes a temperature adjustment driving module 430. The temperature adjustment driving module 430 is electrically connected to the temperature adjustment assembly 410 and the temperature control module 240. The temperature control module 240 detects the current temperature of the LED light source 20 and the preset temperature according to the temperature detection component 420, and outputs a control signal for the operation of the temperature adjustment component 410. The temperature adjustment driving module 430 further drives the temperature adjustment component 410 to work according to the control signal. In an embodiment, the circuit diagram of the temperature regulation driving module 430 is shown in FIG. 6.

Referring to FIG. 2, in one embodiment, the LED light source control device 10 further includes a photodetection device 500. The photodetection device 500 may be arranged in a place around the LED light source 20 that does not affect the direction and intensity of the light. For example, the photodetection device 500 may be arranged on the inner wall of the housing where the LED light source 20 is installed. The photodetection device 500 is used to detect the light intensity signal of the LED light source 20 and convert the light intensity signal into a light intensity electrical signal. The control module 200 further includes a light intensity alarm module 250. The light intensity alarm module 250 is electrically connected to the photoelectric detection device 500. The light intensity alarm module 250 is used to compare the light intensity electrical signal with a preset threshold. When the light intensity electrical signal is greater than the preset threshold, the light intensity alarm module 250 outputs an alarm signal. The light intensity alarm module 250 may be further electrically connected with an alarm device. The alarm device may be a sound alarm device, a light alarm device, or a sound and light alarm device at the same time. In this embodiment, through the photoelectric detection device 500 and the light intensity alarm module 250, when the light intensity of the LED light source 20 is too strong, an alarm signal is output to remind the staff of the abnormal light intensity. The situation is convenient for the staff to adjust and deal with in time.

An embodiment of the present application also provides an LED light source control system. The LED light source control system includes the above-mentioned LED light source control device 10 and a processor. The processor is in communication connection with the control module 200 of the LED light source control device 10. The processor may be a computer device, a programmable logic controller (Programmable Logic Controller, PLC), or a processor of an upper computer. The processor and the control module 20 may be wired or wirelessly connected. The processor can input related control signals to the control module 20. The output signal of the control module 20 can also be further processed or displayed by the processor. The LED light source control system provided in this embodiment includes the LED light source control device 10. The LED light source control device 10 can achieve uniform light output from the LED light source 20. The LED light source control system improves the uniformity of light output of the LED light source 20 and improves the light output effect of the LED light source 20.

An embodiment of the present application provides an LED light source assembly, which includes an LED light source 20 and an LED light source control device 10. The LED light source includes a plurality of LED lights 21. The LED light source control device 10 includes a plurality of constant current driving modules 100, a control module 200 and a constant temperature device 400.

The plurality of constant current driving modules 100 are electrically connected to the plurality of LED lamps 21 respectively. The plurality of constant current driving modules 100 are used to drive the plurality of LED lamps 21. The thermostat 400 is arranged at the bottom of the LED light source 20. The thermostat 400 is used to adjust the temperature of the bottom of the LED light source 20 to keep the temperature of the LED light source 20 constant.

The control module 200 includes a uniformity processing module 210, a current control module 220 and a synchronous drive control module 230. The uniformity processing module 210 is electrically connected to the current control module 220, and the uniformity processing module 210 is configured to receive the uniformity parameter of the LED light source 20, and determine the value of the plurality of uniformity parameters according to the uniformity parameter. The driving current adjustment scheme of the LED lamp 21. The current control module 220 is electrically connected to the plurality of constant current drive modules 100 through the synchronous drive control module 230. The current control module 220 is used for adjusting the driving current of the plurality of LED lamps 21 according to the driving current adjustment scheme. The synchronous driving control module 230 is configured to control the plurality of constant current driving modules 100 to operate synchronously according to the driving current of the plurality of LED lamps 21.

For the specific structure, function, and beneficial effects of the LED light source assembly provided in this embodiment, refer to the above-mentioned embodiment, which will not be repeated here.

An embodiment of the present application also provides a photoelectric pulse detection device. The photoelectric pulse detection device includes the LED light source assembly as described above.

An embodiment of the present application also provides a smart wearable electronic device, which includes the light pulse detection device described above.

The working principles and beneficial effects of the photoelectric pulse detection device and the smart wearable electronic device are as described in the foregoing embodiment, and will not be repeated here.

Referring to Fig. 7, an embodiment of the present application provides a method for controlling an LED light source. The method is used to control the LED light source 20. The LED light source includes a plurality of LED lights 21. The subject of execution of the method may be a computer device or an MCU as described above. The method includes:

S10: Obtain the uniformity parameter of the LED light source 20. The uniformity parameter characterizes the uniformity of the light intensity of the LED light source 20.

S20: Determine a driving current adjustment scheme for the plurality of LED lamps 21 according to the uniformity parameter. Wherein, the driving current adjustment scheme includes the number of the LED lamp 21 whose driving current needs to be adjusted and the adjustment value of the LED lamp 21 whose driving current needs to be adjusted.

S30: Adjust the driving current of the multiple LED lamps 21 according to the driving current adjustment scheme.

The specific adjustment process of the LED light source control method can refer to the above embodiment. In this embodiment, the uniformity parameter of the LED light source 20 is acquired, and the driving current adjustment scheme for the plurality of LED lamps 21 is determined according to the uniformity parameter. The driving current of the plurality of LED lamps 21 is further adjusted according to the driving current adjustment scheme, so that the light output intensity of each LED lamp 21 in the LED light source 20 can be adjusted in real time, so that the LED light source 20 emits light uniformly and improves the light output effect .

Referring to FIG. 8, in one embodiment, S20 includes:

S210: Determine the light intensity of each LED lamp 21 according to the uniformity parameter.

S220: Determine the driving current adjustment scheme according to the light intensity of each LED lamp 21.

Referring to FIG. 9, in one embodiment, S220 includes:

S221: Compare the light intensity of each LED lamp 21 with a corresponding preset light intensity threshold.

S222: When the light intensity of the LED lamp 21 is not equal to the corresponding preset light intensity threshold, the number of the LED lamp 21 is obtained, and the light intensity of the LED lamp 21 is compared with the corresponding preset light intensity threshold. The light intensity threshold is set, and the adjustment value of the LED lamp 21 is determined.

The preset light intensity threshold may be set to different light intensity thresholds for each LED lamp 21 according to the difference of the LED light sources 20. When the light intensity of the LED lamp 21 is equal to the corresponding preset light intensity threshold, it indicates that the LED lamp 21 does not need to be adjusted. When the light intensity of the LED lamp 21 is not equal to the corresponding preset light intensity threshold, it indicates that the LED lamp 21 needs to adjust the driving current to make the LED light source 20 emit uniform light. The specific adjustment value for the driving current of the LED lamp 21 is calculated according to the current light intensity of the LED lamp 21 and the corresponding preset light intensity threshold. For example, according to the uniformity parameter, the light intensity of the LED lamp 21 numbered (1, 1) is 5. The preset light intensity threshold of the LED lamp 21 numbered (1, 1) is 4. Then, the driving current of the LED lamp 21 numbered (1, 1) needs to be adjusted. The adjustment value of the driving current can be determined according to the light intensity (5) and the preset light intensity threshold (4), and the corresponding relationship between the preset light intensity adjustment and the driving current. After adjustment, the light intensity of the LED lamp 21 numbered (1, 1) is 4.

In this embodiment, the light intensity of each LED lamp 21 is determined according to the uniformity parameter, and the light intensity of each LED lamp 21 is compared with a corresponding preset light intensity threshold. When the light intensity of the LED lamp 21 is not equal to the corresponding preset light intensity threshold, the number of the LED lamp 21 is obtained, and the light intensity of the LED lamp 21 is compared with the corresponding preset light intensity. The strong threshold determines the adjustment value of the LED lamp 21. The method provided in this embodiment can accurately obtain the adjustment value of the driving current of each LED lamp 21, thereby realizing the adjustment of the light intensity of each LED lamp 21, and further effectively improving the uniformity of the light output of the LED light source 20 Sex.

The above-mentioned embodiments only express a few implementation modes of the present application, and their description is relatively specific and detailed, but they should not be understood as a limitation on the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can be made, and these all fall within the protection scope of this application. Therefore, the scope of protection of the patent of this application shall be subject to the appended claims.

Claims

An LED light source control device for controlling an LED light source (20), the LED light source includes a plurality of LED lamps (21), characterized in that the LED light source control device includes:

A plurality of constant current driving modules (100), which are respectively electrically connected to the plurality of LED lamps (21), for driving the plurality of LED lamps (21);

The control module (200) includes a uniformity processing module (210) and a current control module (220), the uniformity processing module (210) is electrically connected to the current control module (220), and the current control module ( 220) are respectively electrically connected to the plurality of constant current driving modules (100); the uniformity processing module (210) is used to receive the uniformity parameter of the LED light source (20), and according to the uniformity parameter A driving current adjustment scheme for the plurality of LED lights (21) is determined; the current control module (220) is used to adjust the driving current of the plurality of LED lights (21) according to the driving current adjustment scheme.
The LED light source control device according to claim 1, wherein the control module (200) further comprises:

A synchronous drive control module (230), the current control module (220) is electrically connected to the plurality of constant current drive modules (100) through the synchronous drive control module (230), and the synchronous drive control module ( 230) is used to control the plurality of constant current driving modules (100) to work synchronously according to the driving current of the plurality of LED lamps (21).
The LED light source control device according to claim 2, wherein the constant current drive module (100) comprises:

The constant current control module (110) is electrically connected to the LED lamp (21);

A digital-to-analog conversion module (120), electrically connected to the constant current control module (110) and the synchronous drive control module (230), for converting digital signals into analog signals;

The LED light source control device also includes a plurality of analog-to-digital conversion modules (300), which are respectively electrically connected to the plurality of constant current control modules (110), and are electrically connected to the synchronous drive control module (230), for Convert analog signals to digital signals.
The LED light source control device according to claim 1, further comprising:

The thermostat (400) is arranged at the bottom of the LED light source (20) and is used to adjust the temperature of the LED light source (20) and keep the temperature of the LED light source (20) constant.
The LED light source control device according to claim 4, characterized in that the constant temperature device (400) comprises:

The temperature adjustment component (410) is arranged at the bottom of the LED light source (20) and is used to adjust the temperature of the LED light source (20);

The temperature detection component (420) is arranged at the bottom of the LED light source (20) and is used to detect the temperature of the LED light source (20);

The temperature adjustment drive module (430) is electrically connected to the temperature adjustment assembly (410);

The control module (200) further includes a temperature control module (240), and the temperature control module (240) is electrically connected to the temperature regulation driving module (430) and the temperature detection component (420);

The temperature control module (240) is configured to output a control signal to the temperature adjustment driving module (430) according to the preset temperature and the temperature detected by the temperature detection component (420);

The temperature adjustment driving module (430) is used to drive the temperature adjustment component (410) to work according to the control signal output by the temperature control module (240), so that the temperature of the LED light source (20) remains constant.
The LED light source control device according to claim 1, further comprising:

The photoelectric detection device (500) is used to detect the light intensity signal of the LED light source (20) and convert it into a light intensity electrical signal;

The control module (200) also includes a light intensity alarm module (250), the light intensity alarm module (250) is electrically connected to the photoelectric detection device (500), and the light intensity alarm module (250) is used for The light intensity electrical signal is compared with a preset threshold value, and an alarm signal is output when the light intensity electrical signal is greater than the preset threshold value.
An LED light source assembly, characterized in that it comprises:

LED light source (20), including multiple LED lights (21);

The LED light source control device (10) includes a plurality of constant current drive modules (100), control modules (200) and thermostats (400);

The plurality of constant current driving modules (100) are respectively electrically connected with the plurality of LED lamps (21) for driving the plurality of LED lamps (21);

The thermostat (400) is arranged at the bottom of the LED light source (20), and is used to adjust the temperature of the LED light source (20) and keep the temperature of the LED light source (20) constant;

The control module (200) includes a uniformity processing module (210), a current control module (220), and a synchronous drive control module (230), the uniformity processing module (210) and the current control module (220) Electrically connected, the uniformity processing module (210) is configured to receive the uniformity parameter of the LED light source (20), and determine the driving current adjustment scheme for the plurality of LED lights (21) according to the uniformity parameter The current control module (220) is electrically connected to the plurality of constant current drive modules (100) through the drive control module (230), and the current control module (220) is used for according to the drive current The adjustment scheme adjusts the driving current of the plurality of LED lights (21); the synchronous driving control module (230) is used to control the plurality of constant current driving modes according to the driving current of the plurality of LED lights (21). Group (100) works synchronously.
A photoelectric pulse detection device, characterized by comprising the LED light source assembly according to claim 7.
An LED light source control method for controlling an LED light source (20), the LED light source comprising a plurality of LED lamps (21), characterized in that the method includes:

Acquiring the uniformity parameter of the LED light source (20), the uniformity parameter characterizing the uniformity of the light intensity of the LED light source (20);

Determining a driving current adjustment scheme for the plurality of LED lights (21) according to the uniformity parameter, wherein the driving current adjustment scheme includes the number and adjustment value of the LED lights (21) whose driving current needs to be adjusted;

The driving current of the plurality of LED lamps (21) is adjusted according to the driving current adjustment scheme.
The light source control method according to claim 9, wherein the determining a driving current adjustment scheme for the plurality of LED lights (21) according to the uniformity parameter comprises:

Determining the light intensity of each LED lamp (21) according to the uniformity parameter;

Comparing the light intensity of each LED lamp (21) with a corresponding preset light intensity threshold;

When the light intensity of the LED light (21) is not equal to the corresponding preset light intensity threshold, the number of the LED light (21) is obtained, and the light intensity of the LED light (21) is compared with the corresponding The preset light intensity threshold value determines the adjustment value of the LED lamp (21).