CN116019951A - Proportional-integral driving control circuit and chlorine dioxide sterilizer with same - Google Patents
Proportional-integral driving control circuit and chlorine dioxide sterilizer with same Download PDFInfo
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- CN116019951A CN116019951A CN202310322192.7A CN202310322192A CN116019951A CN 116019951 A CN116019951 A CN 116019951A CN 202310322192 A CN202310322192 A CN 202310322192A CN 116019951 A CN116019951 A CN 116019951A
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Abstract
The invention relates to the technical field of automatic control of sterilizing machines, in particular to a proportional-integral driving control circuit and a chlorine dioxide sterilizing machine with the same, wherein the proportional-integral driving control circuit comprises: a proportional-integral control circuit and a constant current source driving circuit; when the concentration of chlorine dioxide gas in the ambient gas deviates from a reference value, the proportional integration control circuit performs proportional amplification integration treatment on the deviation according to a preset integration time constant and a preset proportional coefficient, and controls the constant current source driving circuit to perform constant current adjustment on the driving current of the LED ultraviolet lamp; the preset integral time constant is matched with the relaxation time of the gradient change of the concentration of the chlorine dioxide gas in the ambient gas, and the proportionality coefficient is set according to the thermal inertia of the chlorine dioxide gas in the ambient gas. The invention can continuously change the driving current of the LED ultraviolet lamp, thereby realizing continuous adjustment of the slow release rate of chlorine dioxide and improving the control precision and the control efficiency.
Description
Technical Field
The invention relates to the technical field of automatic control of sterilizing machines, in particular to a proportional-integral driving control circuit and a chlorine dioxide sterilizing machine with the proportional-integral driving control circuit.
Background
The chlorine dioxide gas sterilizer is a professional device widely used for environmental disinfection and sterilization, and utilizes the gel slow release principle to release the chlorine dioxide gas into the air for mixing, thereby playing a role in disinfection and sterilization. Therefore, controlling the concentration of chlorine dioxide gas becomes a technical key of the chlorine dioxide sterilizer. The control technologies widely used at present are an open control technology, a proportional integral control technology and a fuzzy control technology.
The open control technology has simple principle and releases chlorine dioxide gas at a certain release concentration in a timing way, and has the defect that the control precision is difficult to grasp, so that the chlorine dioxide component in the gas is suddenly high and suddenly low, and the disinfection and sterilization effects are affected. The proportional integral control technology is accurate in control, zero residual error can be achieved, but due to the effect of relaxation time during gas molecule diffusion, the concentration gradient of chlorine dioxide gas is very uneven, the thermal inertia is very large, the concentration of the chlorine dioxide gas cannot be reflected in real time, the system control time constant is large, the time for achieving system balance is long, and the working efficiency of the sterilizer is affected. The fuzzy control technology is a digital control technology, a control strategy is established by using a fuzzy model, the efficiency is higher, but the accuracy is slightly poor, and the application of the fuzzy control technology in a chlorine dioxide sterilizer is affected.
In the various control modes, the slow release function of the chlorine dioxide gel cannot be changed continuously, and the slow release function is used as a terminal executing mechanism of the system, so that the control precision and the control efficiency of the system are greatly influenced.
Therefore, how to realize continuous adjustment of the slow release rate of chlorine dioxide and improve the control accuracy and control efficiency of the sterilizer is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the invention provides a proportional-integral driving control circuit and a chlorine dioxide sterilizer with the same, which can continuously change the driving current of an LED ultraviolet lamp, further realize continuous adjustment of the slow release rate of chlorine dioxide and improve the control precision and the control efficiency.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a proportional-integral drive control circuit for a chlorine dioxide sterilizer, comprising: a proportional-integral control circuit and a constant current source driving circuit;
when the concentration of chlorine dioxide gas in the ambient gas deviates from a reference value, the proportional integral control circuit performs proportional amplification integral processing on the deviation according to a preset integral time constant and a proportional coefficient, and controls the constant current source driving circuit to perform constant current adjustment on the driving current of the LED ultraviolet lamp;
the preset integral time constant is matched with the relaxation time of the gradient change of the concentration of the chlorine dioxide gas in the ambient gas, and the proportionality coefficient is set according to the thermal inertia of the chlorine dioxide gas in the ambient gas.
Further, the proportional-integral control circuit includes: the first operational amplifier A1, the second operational amplifier A2, the integrator A3, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9 and the capacitor C1;
the concentration signal Vi of chlorine dioxide in the ambient gas is transmitted to the inverting input end of the first operational amplifier A1 through a resistor R1, and the reference value signal Vr is transmitted to the non-inverting input end of the first operational amplifier A1 through a resistor R2; one end of the resistor R3 is connected with the non-inverting input end of the first operational amplifier A1, and the other end of the resistor R is grounded; the resistor R4 is connected between the inverting input end and the output end of the first operational amplifier A1; the first operational amplifier compares and amplifies the concentration signal Vi and the reference value signal Vr and outputs a difference value V1 of the concentration signal Vi and the reference value signal Vr;
one end of the resistor R5 is grounded, and the other end of the resistor R5 is connected with the inverting input end of the second operational amplifier A2; the resistor R7 is connected between the inverting input end and the output end of the second operational amplifier A2; the difference V1 is transmitted to the non-inverting input end of the second operational amplifier A2 through a resistor R6, and is subjected to proportional amplification through the second operational amplifier A2 to obtain an output voltage V2;
one end of the resistor R9 is grounded, and the other end of the resistor R9 is connected to the non-inverting input end of the integrator A3; the capacitor C1 is connected between the inverting input end and the output end of the integrator A3; the output voltage V2 is transmitted to the inverting input end of the integrator A3 through the resistor R8, and the output voltage V3 is obtained through the integration processing of the integrator A3.
Further, the amplification factor k=1+r7/R5 of the second operational amplifier A2 is set as the scaling factor of the proportional-integral control circuit.
Further, the time constant τ=r8×c1 of the integrator A3.
Further, the constant current source driving circuit includes: the third operational amplifier A4, the resistor R10, the resistor R11, the resistor R12, the transistor T1 and the transistor T2, wherein the transistor T1 and the transistor T2 form a common base transistor group;
the output voltage V3 of the integrator A3 is transmitted to the non-inverting input end of the third operational amplifier A4 through a resistor R10; one end of the resistor R11 is connected with the output end of the third operational amplifier A4, and the other end is connected with the base electrode of the common base electrode transistor group; one end of the resistor R12 is grounded, and the other end of the resistor R12 is respectively connected with the inverting input end of the third operational amplifier A4 and the emitter of the common base transistor group; the collector of the common base transistor group is connected with the LED ultraviolet lamp.
Further, the output current of the constant current source driving circuit is: io=v3/R12.
In a second aspect, the present invention provides a chlorine dioxide sterilizer, a sterilizer body and the proportional-integral driving control circuit.
Further, the sterilizer body includes: the device comprises a main control board, a display screen, a drainage fan, a fan driving power supply, an inlet gas concentration sensor, a first impedance transformation amplifier, an LED ultraviolet lamp and chlorine dioxide gel; the main control board is respectively connected with the first impedance transformation amplifier, the proportional-integral control circuit, the display screen and the fan driving power supply; the intake gas concentration sensor is connected with the first impedance transformation amplifier; the drainage fan is connected with the fan driving power supply; the LED ultraviolet lamp is connected with the constant current source driving circuit; the chlorine dioxide gel is slowly released under the irradiation of a light source emitted by the LED ultraviolet lamp;
the inlet gas concentration sensor is used for detecting the chlorine dioxide concentration of the ambient gas and enters the proportional-integral control circuit through the first impedance transformation amplifier;
the main control board is used for presetting a chlorine dioxide concentration reference value, and synchronously inputting the chlorine dioxide concentration of the environmental gas and the set chlorine dioxide concentration reference value into the proportional-integral control circuit;
and the proportional-integral control circuit is used for performing proportional-amplification integral processing on deviation when the deviation exists between the chlorine dioxide concentration of the ambient gas and the reference value, and controlling the constant current source driving circuit to perform constant current adjustment on the driving current of the LED ultraviolet lamp.
Further, the sterilizer body further includes: an outlet gas concentration sensor and a second impedance transformation amplifier; the second impedance transformation amplifier is connected with the main control board; the air outlet gas concentration sensor is used for detecting the concentration of chlorine dioxide to be released into the environment and enters the main control board through the second impedance transformation amplifier, and the main control board judges whether the concentration of the chlorine dioxide to be released into the environment exceeds a preset safety value or not.
Compared with the prior art, the invention discloses the proportional-integral drive control circuit and the chlorine dioxide sterilizer with the proportional-integral drive control circuit, and the free path and relaxation time of the molecular motion of the gas are different, so that the chlorine dioxide gas in the environmental gas has certain thermal inertia. The invention designs the proportional integral control circuit by utilizing the characteristic, matches the integral time constant of the proportional integral control circuit according to the relaxation time of the gradient change of the chlorine dioxide gas concentration in the ambient gas, sets the proportional coefficient of the proportional integral control circuit according to the thermal inertia of the chlorine dioxide gas mixture in the ambient gas, thereby rapidly and accurately reaching the balance state of the system and improving the control precision and the working efficiency of the system. The proportional-integral control circuit controls the constant current source driving circuit under the set integral time constant and the set proportional coefficient to provide continuously variable driving current for the LED ultraviolet lamp, so that the slow-release rate of the chlorine dioxide gel is continuously changed. The invention fully utilizes the gradient change of the gas concentration and the relaxation time effect, accurately reflects the concentration change of the chlorine dioxide gas, continuously adjusts the slow release rate of the chlorine dioxide, realizes the rapid balance of the system, and obviously improves the control precision and the control efficiency. Meanwhile, the circuit of the invention consists of pure hardware, and adopts a device redundancy design, thereby improving the response rate of the system and the reliability of the circuit.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a proportional-integral drive control circuit according to the present invention;
fig. 2 is a schematic diagram of residual characteristics of the proportional-integral driving control circuit provided by the invention.
Fig. 3 is a block diagram of the chlorine dioxide sterilizer provided by the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a proportional-integral driving control circuit for a chlorine dioxide sterilizer, which comprises the following components: a proportional-integral control circuit and a constant current source driving circuit;
when the concentration of chlorine dioxide gas in the ambient gas deviates from a reference value, the proportional integration control circuit performs proportional amplification integration treatment on the deviation according to a preset integration time constant and a preset proportional coefficient, and controls the constant current source driving circuit to perform constant current adjustment on the driving current of the LED ultraviolet lamp;
the preset integral time constant is matched with the relaxation time of the gradient change of the concentration of the chlorine dioxide gas in the ambient gas, and the proportionality coefficient is set according to the thermal inertia of the chlorine dioxide gas in the ambient gas.
Specifically, as shown in fig. 1, the proportional-integral control circuit includes: the first operational amplifier A1, the second operational amplifier A2, the integrator A3, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9 and the capacitor C1;
the concentration signal Vi of chlorine dioxide in the ambient gas is transmitted to the inverting input end of the first operational amplifier A1 through a resistor R1, and the reference value signal Vr is transmitted to the non-inverting input end of the first operational amplifier A1 through a resistor R2; one end of the resistor R3 is connected with the non-inverting input end of the first operational amplifier A1, and the other end of the resistor R is grounded; the resistor R4 is connected between the inverting input end and the output end of the first operational amplifier A1; the first operational amplifier compares and amplifies the concentration signal Vi and the reference value signal Vr and outputs a difference value V1 of the concentration signal Vi and the reference value signal Vr;
one end of the resistor R5 is grounded, and the other end of the resistor R5 is connected with the inverting input end of the second operational amplifier A2; the resistor R7 is connected between the inverting input end and the output end of the second operational amplifier A2; the difference V1 is transmitted to the non-inverting input end of the second operational amplifier A2 through a resistor R6, and is subjected to proportional amplification through the second operational amplifier A2 to obtain an output voltage V2;
one end of the resistor R9 is grounded, and the other end of the resistor R9 is connected to the non-inverting input end of the integrator A3; the capacitor C1 is connected between the inverting input end and the output end of the integrator A3; the output voltage V2 is transmitted to the inverting input end of the integrator A3 through the resistor R8, and the output voltage V3 is obtained through the integration processing of the integrator A3.
Wherein, the adjustment of the amplification factor of the second operational amplifier A2 is realized by adjusting the resistance values of the resistor R5 and the resistor R7.
The resistor R5 and the resistor R7 together determine the amplification factor of the second operational amplifier A2, which is (1+r7/R5), that is, the scaling factor of the proportional-integral control circuit. The second operational amplifier A2 amplifies the difference value V1, and adjusts and controls the difference value V1 to the direction of decreasing the absolute value through the closed-loop negative feedback principle. The larger the amplification of the second operational amplifier A2, the faster the adjustment of the difference V1, and the shorter the transition time to zero of the difference V1. In the implementation process, the amplification factor of the second operational amplifier A2 is also set according to the thermal inertia of the chlorine dioxide gas in the ambient gas, and because the diffusion of the chlorine dioxide gas is a slow process, the amplification factor of the second operational amplifier A2 is not too large.
The time constant τ=r8×c1 of the integrator A3. That is, the product of the resistor R8 and the capacitor C1 can be adjusted to change the integration time constant, so that the integration time constant tau is matched with the diffusion relaxation time of the chlorine dioxide gas in the environment gas.
In another embodiment, the constant current source driving circuit includes: the third operational amplifier A4, the resistor R10, the resistor R11, the resistor R12, the transistor T1 and the transistor T2, wherein the transistor T1 and the transistor T2 form a common base transistor group;
the output voltage V3 of the integrator A3 is transmitted to the non-inverting input end of the third operational amplifier A4 through a resistor R10; one end of the resistor R11 is connected with the output end of the third operational amplifier A4, and the other end is connected with the base electrode of the common base electrode transistor group; one end of the resistor R12 is grounded, and the other end of the resistor R12 is respectively connected with the inverting input end of the third operational amplifier A4 and the emitter of the common base transistor group; the collector of the common base transistor group is connected with the LED ultraviolet lamp. The constant current source driving circuit outputs voltage Vc to directly drive the LED ultraviolet lamp group, so that the light intensity of the LED ultraviolet lamp group is changed, and the slow release rate of the chlorine dioxide gel is further regulated, so that accurate closed-loop control is formed.
In the embodiment of the invention, the common base transistor group formed by the transistor T1 and the transistor T2 adopts a redundant design, wherein one transistor is damaged, and the other transistor can work normally. And the number of transistors can be increased according to the output current.
In one embodiment, the output current of the constant current source driving circuit is: io=v3/R12.
In other embodiments, as shown in fig. 3, the present invention also provides a chlorine dioxide sterilizer, comprising: a sterilizer body and a proportional-integral drive control circuit as shown in fig. 1.
Specifically, the sterilizer body includes: the device comprises a main control board, a display screen, a drainage fan, a fan driving power supply, an inlet gas concentration sensor, a first impedance transformation amplifier, an LED ultraviolet lamp and chlorine dioxide gel; the main control board is respectively connected with the first impedance transformation amplifier, the proportional-integral control circuit, the display screen and the fan driving power supply; the intake gas concentration sensor is connected with the first impedance transformation amplifier; the drainage fan is connected with a fan driving power supply; the LED ultraviolet lamp is connected with the constant current source driving circuit; the chlorine dioxide gel is slowly released under the irradiation of a light source emitted by an LED ultraviolet lamp;
the inlet gas concentration sensor is used for detecting the chlorine dioxide concentration of the ambient gas and enters the proportional-integral control circuit through the first impedance transformation amplifier;
the main control board is used for presetting a chlorine dioxide concentration reference value, and synchronously inputting the chlorine dioxide concentration of the environmental gas and the preset chlorine dioxide concentration reference value into the proportional-integral control circuit;
and the proportional-integral control circuit is used for carrying out proportional-amplification integral processing on the deviation when the deviation exists between the chlorine dioxide concentration of the ambient gas and the reference value, and controlling the constant current source driving circuit to carry out constant current adjustment on the driving current of the LED ultraviolet lamp.
As shown in fig. 2, the residual characteristic of the proportional-integral drive control circuit of the chlorine dioxide sterilizer is shown.
The first operational amplifier A1 compares and amplifies the concentration signal Vi and the reference value signal Vr, outputs a difference value V1 of the concentration signal Vi and the reference value signal Vr, and amplifies the difference value V1 by the proportional amplifier to obtain an output voltage V2, wherein the vertical axis in FIG. 2 is the output voltage V2, and the fluctuation graph is a damped sinusoidal oscillation waveform; the horizontal axis is the time after power-on.
When the proportionality coefficient is larger, the system convergence balance time is shorter, and the fluctuation period number is smaller. When the integration time constant is large, the system residual error tends to zero. Because the integral control is carried out on the system residual error, the system residual error can tend to zero during balance, and the accurate control is realized. The integral time constant of the proportional integral control circuit is matched with the relaxation time of chlorine dioxide gas in the ambient gas. The residual error of the system is the difference value between the concentration signal Vi and the reference value signal Vr, the proportional-integral control circuit realizes closed-loop automatic control of the system, and the residual error of the system tends to zero in an ideal state.
In another embodiment, the sterilizer body further comprises: an outlet gas concentration sensor and a second impedance transformation amplifier; the second impedance transformation amplifier is connected with the main control board; the air outlet gas concentration sensor is used for detecting the concentration of chlorine dioxide to be released into the environment and enters the main control board through the second impedance transformation amplifier, and the main control board judges whether the concentration of the chlorine dioxide to be released into the environment exceeds a preset safety value.
Because the output of the gas concentration sensor is a current type signal, and the output of the amplifying circuit is a voltage signal, the conversion of the current voltage signal is necessary, and the second impedance conversion amplifier is used for realizing the matching of the collected data of the gas concentration sensor and the main control board. Similarly, the principle of the first impedance transformation amplifier functions the same as the second impedance transformation amplifier.
The invention is provided with the gas concentration sensor for monitoring the concentration of chlorine dioxide gas to be released into the environment, so that the concentration of the chlorine dioxide released into the environment is in a safe value range, and the protection effect is achieved. The safe value of the chlorine dioxide gas concentration is the maximum allowable chlorine dioxide gas concentration value in the environment gas. The main control board controls the whole machine, and when the concentration of chlorine dioxide released into the environment exceeds a preset safety value, the main control board can send out a reset instruction or a power-off protection instruction.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. A proportional-integral drive control circuit for a chlorine dioxide sterilizer, comprising: a proportional-integral control circuit and a constant current source driving circuit;
when the concentration of chlorine dioxide gas in the ambient gas deviates from a reference value, the proportional integral control circuit performs proportional amplification integral processing on the deviation according to a preset integral time constant and a proportional coefficient, and controls the constant current source driving circuit to perform constant current adjustment on the driving current of the LED ultraviolet lamp;
the preset integral time constant is matched with the relaxation time of the gradient change of the concentration of the chlorine dioxide gas in the ambient gas, and the proportionality coefficient is set according to the thermal inertia of the chlorine dioxide gas in the ambient gas.
2. The proportional-integral drive control circuit for a chlorine dioxide sterilizer of claim 1, wherein the proportional-integral control circuit comprises: the first operational amplifier A1, the second operational amplifier A2, the integrator A3, the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, the resistor R7, the resistor R8, the resistor R9 and the capacitor C1;
the concentration signal Vi of chlorine dioxide in the ambient gas is transmitted to the inverting input end of the first operational amplifier A1 through a resistor R1, and the reference value signal Vr is transmitted to the non-inverting input end of the first operational amplifier A1 through a resistor R2; one end of the resistor R3 is connected with the non-inverting input end of the first operational amplifier A1, and the other end of the resistor R is grounded; the resistor R4 is connected between the inverting input end and the output end of the first operational amplifier A1; the first operational amplifier compares and amplifies the concentration signal Vi and the reference value signal Vr and outputs a difference value V1 of the concentration signal Vi and the reference value signal Vr;
one end of the resistor R5 is grounded, and the other end of the resistor R5 is connected with the inverting input end of the second operational amplifier A2; the resistor R7 is connected between the inverting input end and the output end of the second operational amplifier A2; the difference V1 is transmitted to the non-inverting input end of the second operational amplifier A2 through a resistor R6, and is subjected to proportional amplification through the second operational amplifier A2 to obtain an output voltage V2;
one end of the resistor R9 is grounded, and the other end of the resistor R9 is connected to the non-inverting input end of the integrator A3; the capacitor C1 is connected between the inverting input end and the output end of the integrator A3; the output voltage V2 is transmitted to the inverting input end of the integrator A3 through the resistor R8, and the output voltage V3 is obtained through the integration processing of the integrator A3.
3. The proportional-integral drive control circuit for chlorine dioxide sterilizer of claim 2, wherein the amplification factor k=1+r7/R5 of the second operational amplifier A2 is set as the proportional coefficient of the proportional-integral control circuit.
4. A proportional-integral drive control circuit for a chlorine dioxide sterilizer as claimed in claim 2, wherein the time constant τ=r8×c1 of the integrator A3.
5. The proportional-integral drive control circuit for a chlorine dioxide sterilizer of claim 2, wherein the constant current source drive circuit comprises: the third operational amplifier A4, the resistor R10, the resistor R11, the resistor R12, the transistor T1 and the transistor T2, wherein the transistor T1 and the transistor T2 form a common base transistor group;
the output voltage V3 of the integrator A3 is transmitted to the non-inverting input end of the third operational amplifier A4 through a resistor R10; one end of the resistor R11 is connected with the output end of the third operational amplifier A4, and the other end is connected with the base electrode of the common base electrode transistor group; one end of the resistor R12 is grounded, and the other end of the resistor R12 is respectively connected with the inverting input end of the third operational amplifier A4 and the emitter of the common base transistor group; the collector of the common base transistor group is connected with the LED ultraviolet lamp.
6. The proportional-integral drive control circuit for chlorine dioxide sterilizer of claim 4, wherein the output current of the constant current source drive circuit is: io=v3/R12.
7. A chlorine dioxide sterilizer, comprising: a sterilizer body and a proportional-integral drive control circuit as claimed in any one of claims 1 to 6.
8. The chlorine dioxide sterilizer of claim 7, wherein the sterilizer body includes: the device comprises a main control board, a display screen, a drainage fan, a fan driving power supply, an inlet gas concentration sensor, a first impedance transformation amplifier, an LED ultraviolet lamp and chlorine dioxide gel; the main control board is respectively connected with the first impedance transformation amplifier, the proportional-integral control circuit, the display screen and the fan driving power supply; the intake gas concentration sensor is connected with the first impedance transformation amplifier; the drainage fan is connected with the fan driving power supply; the LED ultraviolet lamp is connected with the constant current source driving circuit; the chlorine dioxide gel is slowly released under the irradiation of a light source emitted by the LED ultraviolet lamp;
the inlet gas concentration sensor is used for detecting the chlorine dioxide concentration of the ambient gas and enters the proportional-integral control circuit through the first impedance transformation amplifier;
the main control board is used for presetting a chlorine dioxide concentration reference value, and synchronously inputting the chlorine dioxide concentration of the environmental gas and the set chlorine dioxide concentration reference value into the proportional-integral control circuit;
and the proportional-integral control circuit is used for performing proportional-amplification integral processing on deviation when the deviation exists between the chlorine dioxide concentration of the ambient gas and the reference value, and controlling the constant current source driving circuit to perform constant current adjustment on the driving current of the LED ultraviolet lamp.
9. The chlorine dioxide sterilizer of claim 8, wherein the sterilizer body further comprises: an outlet gas concentration sensor and a second impedance transformation amplifier; the second impedance transformation amplifier is connected with the main control board; the air outlet gas concentration sensor is used for detecting the concentration of chlorine dioxide to be released into the environment and enters the main control board through the second impedance transformation amplifier, and the main control board judges whether the concentration of the chlorine dioxide to be released into the environment exceeds a preset safety value or not.
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| CN116019951B (en) | 2023-06-09 |
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