CN111542152A - Ultraviolet light source system with automatic feedback correction function of light intensity and its application - Google Patents
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Abstract
一种带有光强自动反馈校正功能的紫外光源系统及其应用,该紫外光源系统包括功率变换器;电流采集器;紫外光源;光敏传感器;外环控制器,将光敏传感器反馈的电信号和设定光强经运算后输出给内环控制器;以及内环控制器,将电流采集器反馈的电信号和外环控制器输出的信号处理后控制功率变换器输出的电流值。本发明的使用双环控制紫外LED,能够时时反馈系统电流和光强的变化,控制器对功率变换器控制端做出有效的调节,消除紫外LED自身光衰和电源电流变化的影响,保证紫外LED输出光功率恒定,确保紫外光源使用的有效性。
An ultraviolet light source system with automatic light intensity feedback correction function and its application, the ultraviolet light source system comprises a power converter; a current collector; an ultraviolet light source; a photosensitive sensor; The set light intensity is output to the inner loop controller after calculation; and the inner loop controller controls the current value output by the power converter after processing the electrical signal fed back by the current collector and the signal output by the outer loop controller. The dual-loop control of the ultraviolet LED in the present invention can feedback the changes of the system current and light intensity from time to time, and the controller effectively adjusts the control end of the power converter, eliminates the influence of the ultraviolet LED's own light decay and power supply current changes, and ensures that the ultraviolet LED The output light power is constant to ensure the effectiveness of the UV light source.
Description
技术领域technical field
本发明属于半导体技术领域,特别是指一种带有光强自动反馈校正功能的紫外光源系统及其应用。The invention belongs to the technical field of semiconductors, in particular to an ultraviolet light source system with an automatic feedback correction function of light intensity and its application.
背景技术Background technique
紫外LED正逐步取代汞灯位置,不断走进人们的生产和生活中,被应用在印刷、医疗、植物照明、水处理、消毒杀菌等多个领域。但是紫外LED制造工艺还不够完善,在长时间工作中光强衰减比蓝光LED或红光LED衰减速度快,光强的减弱势必影响紫外LED的使用效果,降低在应用中的性能。Ultraviolet LEDs are gradually replacing the position of mercury lamps, and they are constantly entering people's production and life, and are used in printing, medical treatment, plant lighting, water treatment, disinfection and sterilization and other fields. However, the UV LED manufacturing process is not perfect, and the light intensity decays faster than blue LED or red LED during long-term work. The weakening of light intensity will inevitably affect the use effect of UV LED and reduce the performance in application.
为了获得恒定的紫外光强输出,有必要对紫外LED进行控制设计。In order to obtain a constant UV light intensity output, it is necessary to control the design of the UV LED.
发明内容SUMMARY OF THE INVENTION
有鉴于此,本发明的主要目的之一在于提出一种带有光强自动反馈校正功能的紫外光源系统及其应用,以期至少部分地解决上述技术问题中的至少之一。In view of this, one of the main purposes of the present invention is to provide an ultraviolet light source system with automatic light intensity feedback correction function and its application, in order to at least partially solve at least one of the above technical problems.
为了实现上述目的,作为本发明的一个方面,提供了一种带有光强自动反馈校正功能的紫外光源系统,包括:In order to achieve the above purpose, as an aspect of the present invention, a UV light source system with automatic light intensity feedback correction function is provided, including:
功率变换器,将供电电源的电能转换成可调节的电流供给紫外光源;The power converter converts the electric energy of the power supply into an adjustable current to supply the ultraviolet light source;
电流采集器,用于检测输入电流值,并反馈给内环控制器;The current collector is used to detect the input current value and feed it back to the inner loop controller;
紫外光源,发出光强信号;Ultraviolet light source, emit light intensity signal;
光敏传感器,将光强信号转化为电信号并放大后反馈给外环控制器;The photosensitive sensor converts the light intensity signal into an electrical signal and amplifies it and feeds it back to the outer loop controller;
外环控制器,将光敏传感器反馈的电信号和设定光强经运算后输出给内环控制器;以及The outer loop controller outputs the electrical signal fed back by the photosensitive sensor and the set light intensity to the inner loop controller after calculation; and
内环控制器,将电流采集器反馈的电信号和外环控制器输出的信号处理后控制功率变换器输出的电流值。The inner loop controller controls the current value output by the power converter after processing the electrical signal fed back by the current collector and the signal output by the outer loop controller.
作为本发明的另一个方面,还提供了一种如上所述的紫外光源系统在印刷、医疗、植物照明、水处理或消毒杀菌领域的应用。As another aspect of the present invention, an application of the above-mentioned ultraviolet light source system in the fields of printing, medical treatment, plant lighting, water treatment or disinfection and sterilization is also provided.
基于上述技术方案可知,本发明的带有光强自动反馈校正功能的紫外光源系统及其应用相对于现有技术至少具有以下优势之一:Based on the above technical solutions, it can be known that the ultraviolet light source system with the automatic light intensity feedback correction function of the present invention and its application have at least one of the following advantages over the prior art:
1、本发明提供了一种带有光强自动反馈校正功能的紫外光源,通过控制紫外LED的输入电流补偿光衰部分,使紫外LED在要求的光强范围内工作;1. The present invention provides an ultraviolet light source with an automatic feedback correction function of light intensity. By controlling the input current of the ultraviolet LED to compensate the light decay part, the ultraviolet LED can work within the required light intensity range;
2、本发明的使用双环控制紫外LED,能够时时反馈系统电流和光强的变化,控制器对功率变换器控制端做出有效的调节,消除紫外LED自身光衰和电源电流变化的影响,保证紫外LED输出光功率恒定,确保紫外光源使用的有效性。2. The dual-loop control of the ultraviolet LED in the present invention can feedback the changes of the system current and light intensity from time to time, and the controller can effectively adjust the control end of the power converter to eliminate the influence of the light decay of the ultraviolet LED itself and the change of the power supply current, so as to ensure The output light power of the UV LED is constant, ensuring the effectiveness of the UV light source.
附图说明Description of drawings
图1为本发明实施例中带有光强自动反馈校正功能的紫外光源结构原理框图;Fig. 1 is the structural principle block diagram of the ultraviolet light source with light intensity automatic feedback correction function in the embodiment of the present invention;
图2为本发明实施例中双环控制系统框图;2 is a block diagram of a dual-loop control system in an embodiment of the present invention;
图3为本发明实施例中自动反馈控制光强逻辑框图;3 is a logical block diagram of automatic feedback control light intensity in an embodiment of the present invention;
图4为本发明实施例中内环控制器驱动波形图。FIG. 4 is a driving waveform diagram of an inner loop controller in an embodiment of the present invention.
具体实施方式Detailed ways
为使本发明的目的、技术方案和优点更加清楚明白,以下结合具体实施例,并参照附图,对本发明作进一步的详细说明。In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
本发明公开了一种带有光强自动反馈校正功能的紫外光源系统,包括:The invention discloses an ultraviolet light source system with an automatic feedback correction function of light intensity, comprising:
功率变换器,将供电电源的电能转换成可调节的电流供给紫外光源;The power converter converts the electric energy of the power supply into an adjustable current to supply the ultraviolet light source;
电流采集器,用于检测输入电流值,并反馈给内环控制器;The current collector is used to detect the input current value and feed it back to the inner loop controller;
紫外光源,发出光强信号;Ultraviolet light source, emit light intensity signal;
光敏传感器,将光强信号转化为电信号并放大后反馈给外环控制器;The photosensitive sensor converts the light intensity signal into an electrical signal and amplifies it and feeds it back to the outer loop controller;
外环控制器,将光敏传感器反馈的电信号和设定光强经运算后输出给内环控制器;以及The outer loop controller outputs the electrical signal fed back by the photosensitive sensor and the set light intensity to the inner loop controller after calculation; and
内环控制器,将电流采集器反馈的电信号和外环控制器输出的信号处理后控制功率变换器输出的电流值。The inner loop controller controls the current value output by the power converter after processing the electrical signal fed back by the current collector and the signal output by the outer loop controller.
在本发明的一些实施例中,所述紫外光源的波长小于320nm。In some embodiments of the present invention, the wavelength of the ultraviolet light source is less than 320 nm.
在本发明的一些实施例中,所述紫外光源包括紫外LED、汞灯、氙灯或紫外荧光灯中的至少一种。In some embodiments of the present invention, the ultraviolet light source includes at least one of an ultraviolet LED, a mercury lamp, a xenon lamp, or an ultraviolet fluorescent lamp.
在本发明的一些实施例中,所述紫外LED包括单颗紫外LED或多颗紫外LED组成的模组。In some embodiments of the present invention, the ultraviolet LED includes a single ultraviolet LED or a module composed of a plurality of ultraviolet LEDs.
在本发明的一些实施例中,所述紫外光源和光敏传感器的相对位置固定不变。In some embodiments of the present invention, the relative positions of the ultraviolet light source and the photosensitive sensor are fixed.
在本发明的一些实施例中,所述紫外光源系统还包括用于保护紫外光源的过流过压保护器。In some embodiments of the present invention, the ultraviolet light source system further includes an overcurrent and overvoltage protector for protecting the ultraviolet light source.
在本发明的一些实施例中,在所述外环控制器的输入端设定光强上限,超过设定光强上限属于无效输入。In some embodiments of the present invention, an upper limit of light intensity is set at the input end of the outer loop controller, and exceeding the set upper limit of light intensity is an invalid input.
在本发明的一些实施例中,所述电流采集器包括采样电阻或霍尔传感器。In some embodiments of the present invention, the current collector includes a sampling resistor or a Hall sensor.
在本发明的一些实施例中,所述外环控制器和内环控制器的控制方式支持模拟控制、数字控制或模数混合控制;In some embodiments of the present invention, the control modes of the outer loop controller and the inner loop controller support analog control, digital control or mixed analog-digital control;
在本发明的一些实施例中,所述外环控制器和内环控制器的控制算法支持PID控制、模糊控制或机器学习。In some embodiments of the present invention, the control algorithms of the outer loop controller and the inner loop controller support PID control, fuzzy control or machine learning.
本发明还公开了如上所述的紫外光源系统在印刷、医疗、植物照明、水处理或消毒杀菌领域的应用。The invention also discloses the application of the above-mentioned ultraviolet light source system in the fields of printing, medical treatment, plant lighting, water treatment or disinfection and sterilization.
在一个示例性实施例中,本发明的一种带有光强自动反馈校正功能的紫外光源系统,包括:功率变换器1、电流采集器2、紫外LED3、光敏传感器4、外环控制器5,内环控制器6、过流过压保护器7。所述功率变换器1与电源连接,用于转换满足需要的电流。所述光敏传感器4接收紫外LED3发出的光强信号并转化电信号,通过一定比例放大后的电信号反馈给外环控制器5,放大的光强采集电信号与设定光强在外环控制器5内运算后输出信号给内环控制器6;内环控制器6处理电流采集信号和外环控制器5的传递信号,输出控制信号调节功率变换器输出电流值。In an exemplary embodiment, an ultraviolet light source system with automatic light intensity feedback correction function of the present invention includes: a power converter 1 , a
其中,所述外环控制器5和内环控制器6的控制拓扑结构既支持单环控制、也支持内环、外环双环控制,多环控制及其衍生拓扑控制;控制方式支持模拟控制、数字控制、模数混合控制;控制算法支持PID控制、模糊控制、机器学习及其他控制算法。Among them, the control topology structure of the outer loop controller 5 and the
其中,内环控制器6输出高电平信号开启功率变换器1,通过控制高电平占空比调节紫外LED3中的电流大小。The
其中,在外环控制器5输入端设定光强,超过内环控制器5设定上限属于无效输入。Among them, setting the light intensity at the input end of the outer loop controller 5 and exceeding the upper limit set by the inner loop controller 5 are invalid inputs.
其中,过流过压保护器7保护紫外LED3不被高电压及大电流击穿损害。Among them, the overcurrent and overvoltage protector 7 protects the
其中,所述电流采集器2,用于检测输入电流值,并反馈给内环控制器6。Among them, the
其中,所述光敏传感器4,用于接收紫外LED3发出的光强信号,并反馈给外环控制器5。The photosensitive sensor 4 is used for receiving the light intensity signal sent by the
其中,紫外LED3的波长小于320nm,可以是单颗紫外LED或多颗紫外LED组成的模组。Among them, the wavelength of the
其中,系统内紫外LED3与光敏传感器4相对位置固定不变。Among them, the relative positions of the
以下通过具体实施例结合附图对本发明的技术方案做进一步阐述说明。需要注意的是,下述的具体实施例仅是作为举例说明,本发明的保护范围并不限于此。The technical solutions of the present invention will be further described below through specific embodiments and accompanying drawings. It should be noted that the following specific embodiments are only for illustration, and the protection scope of the present invention is not limited thereto.
如图1所示,本实施例公开了一种带有光强自动反馈校正功能的紫外光源系统,主要包括:功率变换器1、电流采集器2、紫外LED3、光敏传感器4、外环控制器5,内环控制器6、过流过压保护器7。As shown in FIG. 1 , this embodiment discloses an ultraviolet light source system with automatic light intensity feedback correction function, which mainly includes: a power converter 1, a
本实施例中的功率变换1与供电电源连接,用于转换成满足需要的电流,将供电电源的电能转换成可调节的电流给紫外LED。本实施例中的电流采集器2可以选择使用采样电阻、霍尔传感器或其他电流采集元件,电流采集器2用于检测输出电流变化,并将采集到的电流信号传递给内环控制器6,光敏传感器用于接收紫外LED3发出的光强信号,光强信号转化弱电信号,经过放大后作为外环电路的负反馈电信号传递给外环控制器5。The power conversion 1 in this embodiment is connected to a power supply, and is used to convert the current into a required current, and convert the electric energy of the power supply into an adjustable current for the ultraviolet LED. The
如图2所示,本实施例中控制器分为内环控制器6和外环控制器5。光敏传感器4接收紫外LED发出的光强转化为电信号,通过一定放大后反馈给外环控制器5,光强采集信号与设定光强比较后在外环控制器内部经过比例积分微分计算输出给内环控制器6。As shown in FIG. 2 , the controller in this embodiment is divided into an
内环控制器6接收到电流采集器2反馈的电信号与外环控制器5输出的电信号比较,比较后的电信号在内环控制器内部处理后控制功率变换器输出电流的大小。The
系统内外部故障可能出现高电压或大电流,导致紫外LED3击穿受损。本实施例中的过流过压保护器7能够检测高电压或大电流,关闭功率变换器输出,保护紫外LED3。紫外LED3是波长小于400nm的单颗LED或多颗紫外LED组成的模组;由于光敏传感器4采集光强信号的大小和紫外LED3距离有关,所以系统内紫外LED3与光敏传感器4相对位置固定不变。Internal and external faults in the system may cause high voltage or high current, resulting in breakdown of the UV LED3. The overcurrent and overvoltage protector 7 in this embodiment can detect high voltage or high current, turn off the output of the power converter, and protect the
下面以BUCK同步整流电路为例,结合附图3对本发明的控制过程进行描述。所举实例只用于解释本发明,并非用于限定本发明的范围。Taking the buck synchronous rectification circuit as an example below, the control process of the present invention will be described with reference to FIG. 3 . The examples are only used to explain the present invention, not to limit the scope of the present invention.
设定光敏传感器接收的紫外LED光强信号经过模拟前端后输出Pf,给定的光强信号为Pg,则光强和反馈光强的差ΔP,Set the UV LED light intensity signal received by the photosensitive sensor to output P f after passing through the analog front end, and the given light intensity signal is P g , then the difference between the light intensity and the feedback light intensity ΔP,
ΔP=Pg-Pf ΔP= Pg - Pf
以PID控制算法为例,计算出外环控制器计算的输出电信号是:Taking the PID control algorithm as an example, the output electrical signal calculated by the outer loop controller is calculated as:
其中KP、KI、KD是外环控制器中设定的比例、积分、微分系数。Among them, K P , K I and K D are the proportional, integral and differential coefficients set in the outer loop controller.
外环控制器的输出信号Ig作为内环控制器的输入信号。The output signal Ig of the outer loop controller is used as the input signal of the inner loop controller.
电流采集器采集到If,反馈给内环控制器,与外环控制器的输出信号Ig做差,得到ΔI,The current collector collects I f and feeds it back to the inner loop controller, and makes a difference with the output signal Ig of the outer loop controller to obtain ΔI,
ΔI=Ig-If ΔI = Ig -If
内环控制器内部计算出输出控制端占空比DThe inner loop controller internally calculates the duty cycle D of the output control terminal
其中K′P、K′I、K′D是内环控制器中设定的比例、积分、微分系数。Among them, K' P , K' I and K' D are the proportional, integral and differential coefficients set in the inner loop controller.
D是内环控制器输出占空比,见图4。D is the output duty cycle of the inner loop controller, see Figure 4.
功率变换器有两个信号输入端:控制信号端HO和同步整流信号端LO。当D=0时,HO输出低电平,功率变送器的上开关管处关断状态,电路处于工作停滞状态;The power converter has two signal input terminals: the control signal terminal HO and the synchronous rectification signal terminal LO. When D=0, HO outputs a low level, the upper switch tube of the power transmitter is turned off, and the circuit is in a stagnant state;
当D≥1时,功率变送器的上开关管处于常开状态,此时流经紫外LED电流是供电电压LED负载内阻的比值,是系统的最大电流;When D≥1, the upper switch tube of the power transmitter is in a normally open state, and the current flowing through the UV LED is the ratio of the internal resistance of the LED load of the supply voltage, which is the maximum current of the system;
当0<D<I时,功率变换器的上开关管在开启时间ton内,紫外LED的电流由供电电源经过上开关管、电感后提供;当功率变换器的上开关管在关闭时间toff内,紫外LED的电流由电感提供,并经过下开关管回流;利用电感的自身特性,实现紫外LED的恒定电流供给,进而实现紫外LED的恒功率输出。When 0<D<I, the upper switch tube of the power converter is in the on time t on , and the current of the UV LED is provided by the power supply after passing through the upper switch tube and the inductor; when the upper switch tube of the power converter is turned off at the time t In off , the current of the UV LED is provided by the inductor and flows back through the lower switch tube; the constant current supply of the UV LED is realized by using the characteristics of the inductor itself, and then the constant power output of the UV LED is realized.
由此可见,本发明提供的自动反馈紫外光源系统,通过反馈光强的变化,能够及时有效的改变供电电流,保证紫外光强的稳定。It can be seen that the automatic feedback ultraviolet light source system provided by the present invention can timely and effectively change the power supply current by feeding back the change of the light intensity, so as to ensure the stability of the ultraviolet light intensity.
以上所述的具体实施例,对本发明的目的、技术方案和有益效果进行了进一步详细说明,应理解的是,以上所述仅为本发明的具体实施例而已,并不用于限制本发明,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。The specific embodiments described above further describe the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above-mentioned specific embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention. Within the spirit and principle of the present invention, any modifications, equivalent replacements, improvements, etc. made should be included within the protection scope of the present invention.
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