Ultraviolet sterilization control method and device based on UVC-LED, storage medium and sterilizer

Abstract

The invention discloses an ultraviolet sterilization control method and device based on a UVC-LED, a storage medium and a sterilizer. The method comprises the following steps that the flow velocity V of a water body passing through the ultraviolet sterilizer is obtained in real time; according to the flow velocity V and the length L of the reaction cavity of the ultraviolet sterilizer, calculating the time T = L / V when the water body flows through the irradiation area; the preset radiation dose D is equal to E1 * T, and the corresponding target light intensity E1 is matched according to the time T when the water body flows through the irradiation area and the preset radiation dose D; and according to the required target light intensity E1, the driving current of the UVC-LED light source is adjusted, so that the current light intensity reaches E1. When the flow velocity V is increased, the time T for the water body to flow through the irradiation area is shortened, the light intensity E1 needs to be increased at the moment to compensate time shortening, the total dose D is kept unchanged, and the passing water body can reach the preset radiation dose D; when the flow velocity V is reduced, the time T for the water to flow through the irradiation area is increased, the light intensity E1 can be reduced to save energy, and the dosage is ensured to reach the standard.

Description

Technical Field

[0001] The present invention relates to the technical field of ultraviolet sterilization, and in particular to a UVC-LED-based ultraviolet sterilization control method, device, storage medium and sterilizer. Background Art

[0002] UVC-LED (Ultraviolet-C Light Emitting Diode, Chinese abbreviation, deep ultraviolet light-emitting diode) ultraviolet sterilizer emits ultraviolet rays with a wavelength of 200-280nm (UVC band) through semiconductor materials, destroying the DNA / RNA structure of microorganisms and making them lose their replication ability, thereby achieving a sterilization effect.

[0003] During the sterilization process, the traditional UVC-LED ultraviolet sterilizer applies a rated current to the light source in the UVC-LED ultraviolet sterilizer, so that deep ultraviolet rays of rated light intensity are formed in the UVC-LED ultraviolet sterilizer, and the water body is sterilized by the deep ultraviolet rays of rated light intensity.

[0004] The flow rate of water entering the ultraviolet sterilizer is not fixed. When the rated light intensity set for the UVC-LED ultraviolet sterilizer is too small, it cannot guarantee effective sterilization of the water under high flow rate conditions. When the rated light intensity set for the UVC-LED ultraviolet sterilizer is too high, the excessive light intensity will not substantially enhance the sterilization effect, but will shorten the life of the light source. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose a UVC-LED-based ultraviolet sterilization control method, device, storage medium and sterilizer to solve the technical problems in the prior art that the flow rate of water entering the ultraviolet sterilizer is not fixed. When the rated light intensity set for the UVC-LED ultraviolet sterilizer is too small, it cannot ensure effective sterilization of the water under high flow rate conditions. When the rated light intensity set for the UVC-LED ultraviolet sterilizer is too large, the excessive light intensity will not substantially enhance the sterilization effect, but will shorten the life of the light source.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a UVC-LED-based ultraviolet sterilization control method, comprising the following steps:

[0008] Obtain the water flow rate V passing through the ultraviolet sterilizer in real time;

[0009] According to the flow velocity V and the reaction chamber length L of the ultraviolet sterilizer, the time T for the water to flow through the irradiation area is calculated as T = L / V

[0010] The preset radiation dose D = E1 × T, and the corresponding target light intensity E1 is matched according to the time T that the water flows through the irradiation area and the preset radiation dose D;

[0011] According to the required target light intensity E1, the driving current of the UVC-LED light source is adjusted so that the current light intensity reaches E1.

[0012] In one embodiment, after the step of adjusting the driving current of the UVC-LED light source according to the desired target light intensity E1 so that the current light intensity reaches E1, the following steps are further included:

[0013] The light intensity E2 in the ultraviolet radiation area is detected, and the processor compares the detected light intensity E2 with the target light intensity E1, and adjusts the driving current based on the feedback.

[0014] In one embodiment, in the step of obtaining the water flow rate V passing through the ultraviolet sterilizer in real time, obtaining the water flow rate V includes the following steps:

[0015] Receive real-time raw flow velocity data;

[0016] The original data is processed by sliding average filtering to filter out fluctuation noise.

[0017] In one embodiment, the UVC-LED-based ultraviolet sterilization control method further includes the following steps:

[0018] If the flow velocity V is detected to be less than or equal to 0.1 m / s, it is determined that the water flow is stagnant, and the current applied to the UVC-LED light source is reduced so that the current applied to the UVC-LED light source is at the set current value, and the light intensity of the UVC-LED light source is less than 10 mW / cm 2 Work under.

[0019] In one embodiment, after the step of adjusting the driving current of the UVC-LED light source according to the desired target light intensity E1 so that the current light intensity reaches E1, the following steps are further included:

[0020] The driving current is compensated by accumulating values ​​over time according to a preset attenuation curve of the light source.

[0021] In one embodiment, after the step of compensating the driving current by accumulating the value over time according to the preset attenuation curve of the light source, the following steps are further included:

[0022] Divide the light source power into N continuous intervals (P1, P2, ..., P N ), and set the life attenuation weighting factors k1, k2, ..., k corresponding to each interval N , where the k value increases with increasing power;

[0023] Real-time monitoring of the actual operating power P of the light source shi , and accumulate its running time t1, t2,…, t in each power range N ;

[0024] Calculate equivalent life consumption T eff =Σ(k i ×t i ), i=1 to N;

[0025] According to the equivalent life consumption T eff And the preset attenuation curve is used to calculate the compensation driving current.

[0026] In one embodiment, in the step of dividing the light source power, three intervals are defined based on experimental data:

[0027] Light source low power working range: 0%-40% rated power, k1=0.8;

[0028] Medium power working range of light source: 40%-70% rated power, k2=1.0;

[0029] High power working range of light source: 70%-100% rated power, k3=1.5.

[0030] In a second aspect, the present invention also relates to a UVC-LED-based ultraviolet sterilization control device, comprising:

[0031] Flow meter, used to detect the flow velocity V of water;

[0032] The power regulation module is used to adjust the driving current applied to the UVC-LED light source.

[0033] In a third aspect, the present invention further relates to a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method when executed by a processor.

[0034] In a fourth aspect, the present invention also relates to a sterilizer, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the above method when executing the computer program.

[0035] Compared to the prior art, the UVC-LED-based ultraviolet sterilization control method, device, storage medium, and sterilizer provided by the present invention demonstrate that when the flow velocity V increases, the time T for water to flow through the irradiation area decreases. In this case, the light intensity E1 needs to be increased to compensate for the shortened time, maintaining the total dose D unchanged so that the water passing through it can reach the preset radiation dose D. When the flow velocity V decreases, the time T for water to flow through the irradiation area increases. In this case, the light intensity E1 can be reduced to save energy while ensuring that the dose meets the standard. When the flow velocity decreases, the drive current is automatically reduced, reducing power consumption by 40-70%, avoiding excessive power passing through the light source and resulting in a shortened lifespan. By varying the light source's supply current, the light intensity of the light source changes to match the water flow velocity and ensure that the irradiation dose meets the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a workflow diagram of the UVC-LED-based ultraviolet sterilization control method provided by an embodiment of the present invention;

[0037] Figure 2 This is an attenuation curve diagram of the UVC-LED light source in the UVC-LED-based ultraviolet sterilization control method provided by an embodiment of the present invention;

[0038] Figure 3 This is a circuit diagram of a UVC-LED-based ultraviolet sterilization control device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0040] In order to solve the technical problem that the flow rate of water entering the ultraviolet sterilizer is not fixed, when the rated light intensity set for the UVC-LED ultraviolet sterilizer is too small, it is impossible to ensure effective sterilization of the water under high flow rate conditions; when the rated light intensity set for the UVC-LED ultraviolet sterilizer is too high, the excessive light intensity will not substantially enhance the sterilization effect, but will shorten the life of the light source. The present invention provides a UVC-LED-based ultraviolet sterilization control method, device, storage medium and sterilizer, which can adjust the light intensity of the light source according to the flow rate.

[0041] See also Figure 1 , Figure 1 The following is a workflow diagram of a UVC-LED-based ultraviolet sterilization control method according to an embodiment of the present invention. The UVC-LED-based ultraviolet sterilization control method includes the following steps:

[0042] Obtain the water flow rate V passing through the ultraviolet sterilizer in real time;

[0043] According to the flow velocity V and the reaction chamber length L of the ultraviolet sterilizer, calculate the time T = L / V for the water to flow through the irradiation area;

[0044] The preset radiation dose D = E1 × T, and the corresponding target light intensity E1 is matched according to the time T that the water flows through the irradiation area and the preset radiation dose D;

[0045] According to the required target light intensity E1, the driving current of the UVC-LED light source is adjusted so that the current light intensity reaches E1.

[0046] Specifically, as the flow velocity V increases, the time T for water to flow through the irradiation area decreases. In this case, the light intensity E1 needs to be increased to compensate for this shortened time, maintaining the total dose D constant so that the water can reach the preset radiation dose D. As the flow velocity V decreases, the time T for water to flow through the irradiation area increases. In this case, the light intensity E1 can be reduced to save energy while ensuring that the dose meets the standard. As the flow velocity decreases, the drive current is automatically reduced, reducing power consumption by 40-70%, avoiding excessive power passing through the light source and resulting in a shortened lifespan. By varying the light source's supply current, the light intensity of the light source changes to match the water's flow velocity and ensure that the irradiation dose meets the standard.

[0047] The following table shows the power control parameters of the UVC-LED light source for a sterilizer with a processing capacity of 60 tons per hour. The pipe model of the UV sterilizer is DN100, with a diameter of 100mm. The minimum radiation dose for drinking water is 40mJ / cm 2 The reaction chamber is set to have a length of 0.9 m, and can also be set to other values, such as 0.89 m, 0.87 m, etc. The reaction chamber is set to have a length slightly longer so that even if there is an error in the instantaneous light intensity, the water body can still reach the radiation dose standard.

[0048]

[0049] In order to make the actual irradiation intensity reach the target light intensity, in one embodiment, after the step of adjusting the driving current of the UVC-LED light source according to the required target light intensity E1 so that the current light intensity reaches E1, the following steps are also included:

[0050] Detect the light intensity E in the ultraviolet radiation area 2， The processor compares the detected light intensity E2 with the target light intensity E1 and adjusts the driving current based on feedback.

[0051] This embodiment adds a light intensity feedback closed-loop system on the basis of the original open-loop control. A light intensity probe is deployed at a key position in the UV reaction chamber, such as a UVC sensor based on a GaN photodiode. The actual irradiation intensity E2 is collected in real time. The processor calculates the deviation ΔE=|E1-E2| between E2 and the target value E1, and determines the error direction (positive deviation: E2>E1; negative deviation: E2>E1). <E1)。

[0052] Intelligent adjustment layer: Use PID control algorithm to dynamically correct the drive current. The adjustment formula is:

[0053]

[0054] where K p , K i , K d To preset the proportional, integral and differential coefficients to achieve fast convergence and overshoot suppression. Proportional coefficient Kp: the initial value is set to 1.5; integral coefficient K i : Eliminate static error, set to 0.8; differential coefficient K d : Suppress overshoot, set to 0.2; I new is the new current value after adjustment, I current is the current value before adjustment.

[0055] In order to cope with the fluctuation of water flow rate, in one embodiment, in the step of obtaining the water flow rate V passing through the ultraviolet sterilizer in real time, obtaining the water flow rate V includes the following steps:

[0056] Receive real-time raw flow velocity data;

[0057] The original data is processed by sliding average filtering to filter out fluctuation noise.

[0058] A flow sensor is used to collect flow velocity signals in real time. The sampling frequency is usually 50-100 Hz, capturing millisecond-level fluctuations. The sliding average filter algorithm defines the time window width N (e.g., N = 10 corresponds to a 100 ms window at 10 kHz sampling), and calculates the filtered flow velocity at the kth moment:

[0059]

[0060] The window is automatically narrowed during sudden fluctuations and expanded during steady state. The number of control command oscillations is reduced by 80%, the LED drive current adjustment frequency is reduced from 50 times per second to less than 5 times, circuit loss is reduced, and the dosage error is compressed from ±8% to ±1.5%.

[0061] In order to prevent the light source from continuously emitting high power when the water flow in the ultraviolet sterilizer is small and the flow rate is low, in one embodiment, the ultraviolet sterilization control method based on UVC-LED further includes the following steps:

[0062] If the flow velocity V is detected to be less than or equal to 0.1 m / s, it is determined that the water flow is stagnant, and the current applied to the UVC-LED light source is reduced so that the current applied to the UVC-LED light source is at the set current value, and the light intensity of the UVC-LED light source is less than 10 mW / cm 2 Work under.

[0063] The set current value is 5% of the rated current of the UVC-LED light source, specifically 0.6A.

[0064] like Figure 2 As shown, the light intensity of the UVC-LED light source will gradually decay during use. If the same current is supplied to the UVC-LED light source, the light intensity will gradually weaken, which will affect the sterilization effect. Therefore, in one embodiment, after adjusting the driving current of the UVC-LED light source according to the required target light intensity E1 so that the current light intensity reaches E1, the following steps are also included:

[0065] According to the preset attenuation curve of the light source, the driving current is compensated by accumulating the value over time.

[0066] This embodiment solves the problem of light intensity attenuation during long-term use of UVC-LED light sources by combining light attenuation prediction with dynamic current compensation, and upgrades the device from a fixed output rated light intensity to an adaptive maintained light intensity.

[0067] The following table shows the light source attenuation power control parameters for a sterilizer with a processing capacity of 60 tons per hour.

[0068]

[0069] When the light source attenuation ratio exceeds 30%, replace the UVC-LED light source with a new one.

[0070] The UVC-LED light source operates at different powers, and the corresponding lifespan and light intensity attenuation of the UVC-LED light source are different. Therefore, in one embodiment, after compensating the driving current according to the preset attenuation curve of the light source and accumulating the value over time, the following steps are also included:

[0071] Divide the light source power into N continuous intervals (P1, P2, ..., P N ), and set the life attenuation weighting factors k1, k2, ..., k corresponding to each interval N , where the k value increases with increasing power;

[0072] Real-time monitoring of the actual operating power P of the light source shi , and accumulate its running time t1, t2,…, t in each power range N;

[0073] Calculate equivalent life consumption T eff =Σ(k i ×t i ), i=1 to N;

[0074] According to the equivalent life consumption T eff And the preset attenuation curve is used to calculate the compensation driving current.

[0075] This embodiment upgrades the UVC-LED life management from extensive timing to refined efficiency through dynamic modeling of power range and life consumption, using equivalent life consumption T eff Replace the single physical time to reflect the real aging state; through the power interval weight k i , capturing the nonlinear impact of complex working conditions on life; combining real-time compensation with self-learning algorithms to achieve active suppression of light intensity attenuation; measured data show that this solution can extend the effective life of equipment in high-fluctuation scenarios by more than 50%, while reducing redundant energy consumption by 30%.

[0076] In one embodiment, in the step of dividing the light source power, three intervals are defined based on experimental data:

[0077] Light source low power working range: 0%-40% rated power, k1=0.8;

[0078] Medium power working range of light source: 40%-70% rated power, k2=1.0;

[0079] High power working range of light source: 70%-100% rated power, k3=1.5.

[0080] Through experimentally driven power range division and differentiated lifetime attenuation weights, refined control of light source lifetime is achieved.

[0081] like Figure 3 As shown, the present invention also relates to an ultraviolet sterilization control device based on UVC-LED, including a flow meter, a power regulation module and a light intensity probe. The flow meter is used to detect the flow velocity V of the water body; the power regulation module is used to adjust the driving current applied to the UVC-LED light source; the light intensity probe is arranged in the reaction chamber of the ultraviolet sterilizer, and is used to detect the real-time collection of actual irradiation intensity E2 when the light source emits light.

[0082] The processor is connected to the flow meter, light intensity probe and power regulation module. The power regulation module is connected to the UVC-LED light source. The processor divides the interval according to the power P and accumulates the running time t of each interval. i , running time t i 、T eff The data is stored in the memory.

[0083] Among them, the flow meter can be an electromagnetic flow meter, an ultrasonic flow meter, a turbine flow meter, etc.; the power regulation module can be a dedicated LED driver IC (Integrated Circuit), specific models include TI LM3409, Infineon ILD6070, etc., which integrates constant current control, PWM dimming, and over-temperature protection functions; it can also be an MCU (Microcontroller Unit) and a driver combination, specific models include STM32G4 series combined with MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor); the light intensity probe can be a UVC sensor with a GaN (gallium nitride) photodiode, or a silicon carbide ultraviolet sensor.

[0084] The present invention also relates to a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method when executed by a processor.

[0085] If the integrated module / unit of the UVC-LED ultraviolet sterilization control device of the sterilizer is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. Computer-readable media may include: any entity or device that can carry computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0086] The present invention also relates to a sterilizer, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the steps of the above method are implemented when the processor executes the computer program.

[0087] When a processor executes a computer program, it implements the functions of each module / unit in each of the aforementioned UVC-LED ultraviolet sterilization control device embodiments. The computer program can be divided into one or more modules / units, one or more of which are stored in a memory and executed by the processor to implement the present invention. One or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program in the UVC-LED ultraviolet sterilization control device.

[0088] The processor can be a central processing unit, a digital signal processor, an application-specific integrated circuit, an off-the-shelf programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc. The processor is the control center of the sterilizer and connects various parts of the entire sterilizer using various interfaces and lines.

[0089] The memory can be used to store computer programs and / or modules. The processor implements the various functions of the sterilizer by running or executing the computer programs and / or modules stored in the memory and accessing the data stored in the memory. The memory can primarily include a program storage area and a data storage area. The program storage area can store the operating system and at least one application required for a function, while the data storage area can store data generated based on the use of the phone. Furthermore, the memory can be one or more of a hard drive, internal memory, a plug-in hard drive, a memory card, and a flash memory card.

[0090] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A UVC-LED-based ultraviolet sterilization control method, characterized in that: The following steps are involved: Obtain the water flow rate V passing through the ultraviolet sterilizer in real time; Calculate the time T=L / V for the water to flow through the irradiation area based on the flow velocity V and the reaction chamber length L of the ultraviolet sterilizer; The preset radiation dose D = E1 × T, and the corresponding target light intensity E1 is matched according to the time T that the water flows through the irradiation area and the preset radiation dose D; According to the required target light intensity E1, the driving current of the UVC-LED light source is adjusted so that the current light intensity reaches E1.

2. The UVC-LED-based ultraviolet sterilization control method according to claim 1, characterized in that: After the step of adjusting the driving current of the UVC-LED light source according to the required target light intensity E1 so that the current light intensity reaches E1, the following steps are also included: Detect the light intensity E in the ultraviolet radiation area 2， The processor compares the detected light intensity E2 with the target light intensity E1 and adjusts the driving current based on feedback.

3. The UVC-LED-based ultraviolet sterilization control method according to claim 1, characterized in that: In the step of obtaining the water flow rate V passing through the ultraviolet sterilizer in real time, obtaining the water flow rate V includes the following steps: Receive real-time raw flow velocity data; The original data is processed by sliding average filtering to filter out fluctuation noise.

4. The UVC-LED-based ultraviolet sterilization control method according to claim 1, characterized in that: The following steps are also included: If the flow velocity V is detected to be less than or equal to 0.1 m / s, it is determined that the water flow is stagnant, and the current applied to the UVC-LED light source is reduced so that the current applied to the UVC-LED light source is at the set current value, and the light intensity of the UVC-LED light source is less than 10 mW / cm 2 Work under.

5. The UVC-LED-based ultraviolet sterilization control method according to claim 1, characterized in that: After the step of adjusting the driving current of the UVC-LED light source according to the required target light intensity E1 so that the current light intensity reaches E1, the following steps are also included: The driving current is compensated by accumulating values ​​over time according to a preset attenuation curve of the light source.

6. The UVC-LED-based ultraviolet sterilization control method according to claim 5, characterized in that: After the step of compensating the driving current by accumulating the value over time according to the preset attenuation curve of the light source, the following steps are also included: Divide the light source power into N continuous intervals (P1, P2, ..., P N ), and set the life attenuation weighting factors k1, k2, ..., k corresponding to each interval N , where the k value increases with increasing power; Real-time monitoring of the actual operating power P of the light source shi , and accumulate its running time t1, t2,…, t in each power range N ; Calculate equivalent life consumption T eff =Σ(k i ×t i ), i=1 to N; According to the equivalent life consumption T eff And the preset attenuation curve is used to calculate the compensation driving current.

7. The UVC-LED-based ultraviolet sterilization control method according to claim 6, characterized in that: In the step of dividing the light source power, three intervals are defined based on experimental data: Light source low power working range: 0%-40% rated power, k1=0.8; Medium power working range of light source: 40%-70% rated power, k2=1.0; High power working range of light source: 70%-100% rated power, k3=1.

5.

8. A UVC-LED-based ultraviolet sterilization control device, characterized in that: include: Flow meter, used to detect the flow velocity V of water; The power regulation module is used to adjust the driving current applied to the UVC-LED light source.

9. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A sterilizer, characterized in that: The method comprises a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the method according to any one of claims 1 to 7 when executing the computer program.

Images