CN111542152A - Ultraviolet light source system with light intensity automatic feedback correction function and application thereof - Google Patents
Ultraviolet light source system with light intensity automatic feedback correction function and application thereof Download PDFInfo
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- CN111542152A CN111542152A CN202010445746.9A CN202010445746A CN111542152A CN 111542152 A CN111542152 A CN 111542152A CN 202010445746 A CN202010445746 A CN 202010445746A CN 111542152 A CN111542152 A CN 111542152A
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- light source
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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
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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]
- H05B45/20—Controlling the colour of the light
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Abstract
An ultraviolet light source system with automatic light intensity feedback correction function and application thereof, wherein the ultraviolet light source system comprises a power converter; a current collector; an ultraviolet light source; a photosensitive sensor; the outer ring controller outputs the electric signal fed back by the photosensitive sensor and the set light intensity to the inner ring controller after operation; and the inner loop controller is used for controlling the current value output by the power converter after processing the electric signal fed back by the current collector and the signal output by the outer loop controller. The ultraviolet LED is controlled by the double rings, the change of the current and the light intensity of the system can be fed back in real time, the controller effectively adjusts the control end of the power converter, the influence of the light attenuation of the ultraviolet LED and the change of the current of a power supply is eliminated, the output light power of the ultraviolet LED is ensured to be constant, and the use effectiveness of an ultraviolet light source is ensured.
Description
Technical Field
The invention belongs to the technical field of semiconductors, and particularly relates to an ultraviolet light source system with an automatic light intensity feedback correction function and application thereof.
Background
Ultraviolet LEDs are gradually replacing mercury lamps, continuously enter the production and life of people, and are applied to a plurality of fields of printing, medical treatment, plant illumination, water treatment, disinfection and sterilization and the like. However, the manufacturing process of the ultraviolet LED is not perfect enough, the attenuation speed of the light intensity is higher than that of a blue LED or a red LED in long-time work, the use effect of the ultraviolet LED is influenced by the attenuation of the light intensity, and the performance of the ultraviolet LED in application is reduced.
In order to obtain a constant ultraviolet light intensity output, it is necessary to design the control of the ultraviolet LED.
Disclosure of Invention
It is therefore one of the primary objectives of the claimed invention to provide an ultraviolet light source system with automatic light intensity feedback correction function and its application, so as to at least partially solve at least one of the above technical problems.
In order to achieve the above object, as one aspect of the present invention, there is provided an ultraviolet light source system with an automatic light intensity feedback correction function, comprising:
the power converter converts the electric energy of the power supply into adjustable current to supply to the ultraviolet light source;
the current collector is used for detecting an input current value and feeding back the input current value to the inner loop controller;
an ultraviolet light source for emitting a light intensity signal;
the photosensitive sensor converts the light intensity signal into an electric signal, amplifies the electric signal and feeds the electric signal back to the outer ring controller;
the outer ring controller outputs the electric signal fed back by the photosensitive sensor and the set light intensity to the inner ring controller after operation; and
and the inner-loop controller is used for controlling the current value output by the power converter after processing the electric signal fed back by the current collector and the signal output by the outer-loop controller.
As another aspect of the present invention, there is also provided an application of the ultraviolet light source system as described above in the fields of printing, medical treatment, plant illumination, water treatment, or sterilization.
Based on the technical scheme, compared with the prior art, the ultraviolet light source system with the function of automatically feeding back and correcting the light intensity and the application thereof have at least one of the following advantages:
1. the invention provides an ultraviolet light source with an automatic light intensity feedback correction function, which compensates a light attenuation part by controlling the input current of an ultraviolet LED so that the ultraviolet LED works in a required light intensity range;
2. the ultraviolet LED is controlled by the double rings, the change of the current and the light intensity of the system can be fed back in real time, the controller effectively adjusts the control end of the power converter, the influence of the light attenuation of the ultraviolet LED and the change of the current of a power supply is eliminated, the output light power of the ultraviolet LED is ensured to be constant, and the use effectiveness of an ultraviolet light source is ensured.
Drawings
FIG. 1 is a schematic block diagram of an ultraviolet light source with an automatic light intensity feedback correction function according to an embodiment of the present invention;
FIG. 2 is a block diagram of a dual loop control system in an embodiment of the present invention;
FIG. 3 is a logic diagram of automatic feedback control of light intensity in an embodiment of the present invention;
FIG. 4 is a waveform diagram of the driving of the inner loop controller according to an embodiment of the present invention.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The invention discloses an ultraviolet light source system with automatic light intensity feedback correction function, which comprises:
the power converter converts the electric energy of the power supply into adjustable current to supply to the ultraviolet light source;
the current collector is used for detecting an input current value and feeding back the input current value to the inner loop controller;
an ultraviolet light source for emitting a light intensity signal;
the photosensitive sensor converts the light intensity signal into an electric signal, amplifies the electric signal and feeds the electric signal back to the outer ring controller;
the outer ring controller outputs the electric signal fed back by the photosensitive sensor and the set light intensity to the inner ring controller after operation; and
and the inner-loop controller is used for controlling the current value output by the power converter after processing the electric signal fed back by the current collector and the signal output by the outer-loop controller.
In some embodiments of the invention, the ultraviolet light source has a wavelength of less than 320 nm.
In some embodiments of the invention, the ultraviolet light source comprises at least one of an ultraviolet LED, a mercury lamp, a xenon lamp, or an ultraviolet fluorescent lamp.
In some embodiments of the present invention, the uv LED comprises a single uv LED or a module of multiple uv LEDs.
In some embodiments of the invention, the relative positions of the ultraviolet light source and the photosensor are fixed.
In some embodiments of the invention, the uv light source system further comprises an overcurrent and overvoltage protector for protecting the uv light source.
In some embodiments of the invention, an upper light intensity limit is set at the input of the outer loop controller, exceeding the upper light intensity limit being an invalid input.
In some embodiments of the invention, the current collector comprises a sampling resistor or a hall sensor.
In some embodiments of the invention, the control mode of the outer ring controller and the inner ring controller supports analog control, digital control or analog-digital mixed control;
in some embodiments of the invention, the control algorithms of the outer and inner loop controllers support PID control, fuzzy control or machine learning.
The invention also discloses application of the ultraviolet light source system in the fields of printing, medical treatment, plant illumination, water treatment or disinfection and sterilization.
In an exemplary embodiment, the present invention provides an ultraviolet light source system with an automatic light intensity feedback correction function, comprising: the device comprises a power converter 1, a current collector 2, an ultraviolet LED3, a photosensitive sensor 4, an outer ring controller 5, an inner ring controller 6 and an overcurrent and overvoltage protector 7. The power converter 1 is connected to a power supply for converting a current to meet a demand. The photosensitive sensor 4 receives a light intensity signal sent by the ultraviolet LED3 and converts the light intensity signal into an electric signal, the electric signal is amplified in a certain proportion and fed back to the outer ring controller 5, and the amplified light intensity acquisition electric signal and the set light intensity are operated in the outer ring controller 5 and then output to the inner ring controller 6; the inner ring controller 6 processes the current acquisition signal and the transmission signal of the outer ring controller 5, and outputs a control signal to adjust the output current value of the power converter.
The control topological structures of the outer ring controller 5 and the inner ring controller 6 support single-ring control, inner ring and outer ring double-ring control, multi-ring control and derivative topological control thereof; the control mode supports analog control, digital control and analog-digital mixed control; the control algorithm supports PID control, fuzzy control, machine learning, and other control algorithms.
The inner ring controller 6 outputs a high level signal to turn on the power converter 1, and adjusts the current in the ultraviolet LED3 by controlling the high level duty ratio.
Wherein, the light intensity is set at the input end of the outer ring controller 5, and the invalid input is the result of exceeding the set upper limit of the inner ring controller 5.
The over-current and over-voltage protector 7 protects the ultraviolet LED3 from being damaged by high voltage and large current breakdown.
The current collector 2 is used for detecting an input current value and feeding back the input current value to the inner loop controller 6.
The photosensitive sensor 4 is used for receiving a light intensity signal sent by the ultraviolet LED3 and feeding back the light intensity signal to the outer ring controller 5.
The wavelength of the ultraviolet LED3 is less than 320nm, and the ultraviolet LED3 can be a single ultraviolet LED or a module consisting of a plurality of ultraviolet LEDs.
Wherein, the relative position of the ultraviolet LED3 and the photosensitive sensor 4 in the system is fixed.
The technical solution of the present invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings. It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto.
As shown in fig. 1, the present embodiment discloses an ultraviolet light source system with an automatic light intensity feedback correction function, which mainly includes: the device comprises a power converter 1, a current collector 2, an ultraviolet LED3, a photosensitive sensor 4, an outer ring controller 5, an inner ring controller 6 and an overcurrent and overvoltage protector 7.
The power converter 1 in this embodiment is connected to a power supply, and is configured to convert the power into a current that meets a requirement, and convert the electric energy of the power supply into an adjustable current for the ultraviolet LED. The current collector 2 in this embodiment can selectively use a sampling resistor, a hall sensor or other current collecting elements, the current collector 2 is used for detecting the change of output current and transmitting the collected current signal to the inner loop controller 6, the photosensitive sensor is used for receiving a light intensity signal sent by the ultraviolet LED3, the light intensity signal is converted into a weak current signal, and the weak current signal is amplified and then transmitted to the outer loop controller 5 as a negative feedback electrical signal of the outer loop circuit.
As shown in fig. 2, the controller is divided into an inner ring controller 6 and an outer ring controller 5 in this embodiment. The photosensitive sensor 4 receives light intensity emitted by the ultraviolet LED and converts the light intensity into an electric signal, the electric signal is amplified to a certain degree and then fed back to the outer ring controller 5, and a light intensity acquisition signal is compared with set light intensity and then is output to the inner ring controller 6 through proportional-integral-differential calculation in the outer ring controller.
The electric signal fed back by the current collector 2 received by the inner ring controller 6 is compared with the electric signal output by the outer ring controller 5, and the compared electric signal is processed in the inner ring controller to control the output current of the power converter.
External faults within the system may occur at high voltages or currents, resulting in breakdown damage to the ultraviolet LED 3. The overcurrent and overvoltage protector 7 in this embodiment can detect high voltage or large current, close the output of the power converter, and protect the ultraviolet LED 3. The ultraviolet LED3 is a module consisting of a single LED or a plurality of ultraviolet LEDs with the wavelength less than 400 nm; because the size of the light intensity signal collected by the photosensitive sensor 4 is related to the distance of the ultraviolet LED3, the relative position of the ultraviolet LED3 and the photosensitive sensor 4 in the system is fixed.
The control process of the present invention will be described with reference to fig. 3 by taking a BUCK synchronous rectifier circuit as an example. The examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention.
Setting ultraviolet LED light intensity signals received by the photosensitive sensor to pass through the analog front end and then output PfGiven a light intensity signal of PgThe difference deltap between the light intensity and the feedback light intensity,
ΔP＝Pg-Pf
taking the PID control algorithm as an example, the output electrical signal calculated by the outer loop controller is calculated as follows:
wherein KP、KI、KDIs proportional, integral and differential coefficients set in the outer ring controller.
Output signal I of outer loop controllergAs an input signal to the inner loop controller.
The current collector collects IfFeeding back to the inner loop controller, subtracting the output signal Ig of the outer loop controller to obtain delta I,
ΔI＝Ig-If
the duty ratio D of an output control end is calculated inside the inner ring controller
Wherein K'P、K′I、K′DAre proportional, integral, and differential coefficients set in the inner loop controller.
D is the inner loop controller output duty cycle, see fig. 4.
The power converter has two signal inputs: a control signal terminal HO and a synchronous rectification signal terminal LO. When D is 0, HO outputs low level, an upper switching tube of the power transmitter is in an off state, and the circuit is in a work stagnation state;
when D is larger than or equal to 1, an upper switch tube of the power transmitter is in a normally open state, and the current flowing through the ultraviolet LED is the ratio of the internal resistance of the LED load of the power supply voltage and is the maximum current of the system;
when D is more than 0 and less than I, the upper switch tube of the power converter is on for time tonIn the device, the current of the ultraviolet LED is provided by a power supply through an upper switch tube and an inductor; when the upper switch tube of the power converter is at the closing time toffIn the device, the current of the ultraviolet LED is provided by an inductor and flows back through a lower switching tube; the constant current supply of the ultraviolet LED is realized by utilizing the self characteristic of the inductor, and further, the constant power output of the ultraviolet LED is realized.
Therefore, the automatic feedback ultraviolet light source system provided by the invention can timely and effectively change the power supply current through the feedback of the change of the light intensity, and ensure the stability of the ultraviolet light intensity.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An ultraviolet light source system with an automatic light intensity feedback correction function, comprising:
the power converter converts the electric energy of the power supply into adjustable current to supply to the ultraviolet light source;
the current collector is used for detecting an input current value and feeding back the input current value to the inner loop controller;
an ultraviolet light source for emitting a light intensity signal;
the photosensitive sensor converts the light intensity signal into an electric signal, amplifies the electric signal and feeds the electric signal back to the outer ring controller;
the outer ring controller outputs the electric signal fed back by the photosensitive sensor and the set light intensity to the inner ring controller after operation; and
and the inner-loop controller is used for controlling the current value output by the power converter after processing the electric signal fed back by the current collector and the signal output by the outer-loop controller.
2. The UV light source system of claim 1,
the wavelength of the ultraviolet light source is less than 320 nm.
3. The UV light source system of claim 1,
the ultraviolet light source comprises at least one of an ultraviolet LED, a mercury lamp, a xenon lamp or an ultraviolet fluorescent lamp.
4. The UV light source system of claim 3,
the ultraviolet LED comprises a single ultraviolet LED or a module consisting of a plurality of ultraviolet LEDs.
5. The UV light source system of claim 1,
the relative position of the ultraviolet light source and the photosensitive sensor is fixed.
6. The UV light source system of claim 1,
the ultraviolet light source system also comprises an overcurrent and overvoltage protector for protecting the ultraviolet light source.
7. The UV light source system of claim 1,
and setting an upper limit of light intensity at the input end of the outer ring controller, wherein the light intensity exceeding the upper limit of the set light intensity belongs to invalid input.
8. The UV light source system of claim 1,
the current collector comprises a sampling resistor or a Hall sensor.
9. The UV light source system of claim 1,
the control mode of the outer ring controller and the inner ring controller supports analog control, digital control or analog-digital mixed control;
the control algorithms of the outer ring controller and the inner ring controller support PID control, fuzzy control or machine learning.
10. Use of the uv light source system according to any one of claims 1 to 9 in the fields of printing, medical treatment, plant lighting, water treatment or disinfection and sterilization.
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Cited By (6)
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| CN112783041A (en) * | 2020-12-31 | 2021-05-11 | 南京杰思尔环保智能科技有限公司 | Single-chip microcomputer-based wavelength UV (ultraviolet) generator and method for correcting fuzzy control technology |
| CN112834034A (en) * | 2020-12-31 | 2021-05-25 | 南京杰思尔环保智能科技有限公司 | Neuron network correction wavelength UV generator and method based on single chip microcomputer |
| CN112835291A (en) * | 2020-12-31 | 2021-05-25 | 南京杰思尔环保智能科技有限公司 | Single-chip microcomputer-based self-adaptive wavelength correction UV generator and strategy |
| CN113433106A (en) * | 2021-08-27 | 2021-09-24 | 江苏普度自控技术有限公司 | Sulfur dioxide detection structure, system and method based on ultraviolet fluorescence method |
| CN114237034A (en) * | 2021-12-14 | 2022-03-25 | 中国科学院精密测量科学与技术创新研究院 | Device and method for controlling light intensity stability of spectrum lamp by mercury ion microwave frequency standard |
| CN117420091A (en) * | 2023-12-19 | 2024-01-19 | 河北德润厚天科技股份有限公司 | Method and equipment for detecting quality of purified water |
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