CN115117843A - Power supply control system for plasma sterilization device - Google Patents
Power supply control system for plasma sterilization device Download PDFInfo
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- CN115117843A CN115117843A CN202210869203.9A CN202210869203A CN115117843A CN 115117843 A CN115117843 A CN 115117843A CN 202210869203 A CN202210869203 A CN 202210869203A CN 115117843 A CN115117843 A CN 115117843A
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- 230000001954 sterilising effect Effects 0.000 title claims abstract description 47
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 29
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- 239000003990 capacitor Substances 0.000 claims description 116
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- 238000013528 artificial neural network Methods 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
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Abstract
The invention discloses a power supply control system of a plasma sterilization device, belonging to the technical field of plasma sterilization power supplies and comprising: the control circuit receives the target power and the safe current range input by the display and input circuit, compares the input power of the high-voltage alternating-current power supply used for plasma sterilization and the power detected by the input current transmitted by the detection circuit, and sends a real-time control signal when the input power of the high-voltage alternating-current power supply used for plasma sterilization and the power detected by the input current exceed the target power; the push-pull square wave generating circuit is used for adjusting the duty ratio according to the value of the analog signal to obtain a square wave signal; the method receives the square wave signals transmitted by the push-pull square wave generating circuit, processes the square wave signals into two paths of isolated square waves to be output, and realizes the regulation of the power output power of the plasma sterilization device.
Description
Technical Field
The invention belongs to the technical field of plasma sterilization power supplies, and relates to a power supply control system for a plasma sterilization device.
Background
At present, domestic plasma sterilization is applied to fresh vegetables, medical instruments, environmental sterilization and other aspects due to the advantages of low temperature, high efficiency, environmental protection, safety and portability, researches show that under certain other conditions, the yield of active substances such as ozone generated by Dielectric Barrier Discharge (DBD) is in direct proportion to the output power of a dielectric barrier discharge excitation source, and the load characteristic of the DBD is influenced by factors such as temperature, humidity and gas flow rate to generate large-range fluctuation. However, the dielectric barrier discharge excitation source widely used in industry at present is generally an open-loop power supply, and cannot ensure the stability of output power under the condition of DBD load characteristic variation, which affects the stability of the sterilization effect of the device. The DBD may not work normally due to oxidation, external force, etc., and the working state of the load needs to be detected, so that the DBD can be replaced at any time when working abnormally. But the dielectric barrier discharge power supply widely used in industry at present lacks effective protection measures against load abnormality.
Disclosure of Invention
In order to solve the above technical problems in the prior art, the present invention provides a power control system for a plasma sterilization apparatus, which indirectly controls the output power of a power supply by using a method of controlling the input power, since the input power detection of a plasma load is easy to implement and has low cost; the duty ratio of a switching tube of an alternating current high-voltage power supply used in industry is controlled by adopting a self-adaptive control mode of RBF-PI so as to adjust output power, the self-adaption to load change is achieved, the robustness of a control system is improved, a key and an OLED screen are adopted to realize a man-machine interaction function, a user can conveniently adjust target power and the normal working current range of the power supply, when abnormal working conditions occur, the output of the power supply is controlled to be cut off by a main control chip, and an LED and a buzzer are used to realize an alarm function. The stability of the plasma sterilization device and the sterilization effect is improved;
the invention provides the technical scheme that: a power control system for a plasma sterilization device, comprising:
a detection circuit for detecting the input power and input current of a high-voltage alternating-current power supply used for plasma sterilization;
the display and input circuit is used for displaying and setting a target power value, and the current range is used as a working target power and a safe current range;
the control circuit receives the input power transmitted by the detection circuit, processes the data and outputs the power value at the next moment; the control circuit receives the target power and the safe current range input by the display and input circuit, compares the target power and the safe current range with the input power of the high-voltage alternating current power supply used for plasma sterilization and the power detected by the input current, which are transmitted by the detection circuit, outputs a real-time control signal, controls the input power of the high-voltage alternating current power supply used for plasma sterilization, and tracks the target power input by the input circuit; when the input current of a high-voltage alternating current power supply used for plasma sterilization does not accord with the safe current range, outputting an alarm signal;
the digital-to-analog conversion circuit receives the processed digital signal transmitted by the control circuit and converts the digital signal into an analog signal;
the push-pull square wave generating circuit receives the analog signal transmitted by the digital-to-analog conversion circuit, and adjusts the duty ratio according to the value of the analog signal to obtain a square wave signal;
the IGBT negative pressure turn-off driving circuit receives the square wave signals transmitted by the push-pull square wave generating circuit, processes the square wave signals into two paths of isolated square waves and outputs the isolated square waves to realize the adjustment of the power output power of the plasma sterilization device;
and when the current value is not within the set safe current value range, the alarm circuit receives the control signal of the control circuit to alarm.
Further, the method comprises the following steps: the detection circuit comprises a first input end, a second input end, a third input end, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a current type voltage transformer, a current transformer and a power measurement chip;
the first input end is connected with the first end of the first resistor,
two ends of the primary side of the current type voltage transformer are respectively connected with the second end and the second input end of the first resistor, the secondary side of the current type voltage transformer is connected with the second resistor in parallel,
the first end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the first capacitor, the second end of the second resistor is connected with the second end of the first capacitor and the fourth pin of the power sampling chip, the second end of the first capacitor is grounded,
the current transformer is connected with the fourth resistor in parallel, the first end and the second end of the fourth resistor are respectively connected with the first end of the fifth resistor and the first end of the sixth resistor, the first end of the second capacitor is connected with the second end of the fifth resistor and the second pin of the power measurement chip, the second end of the third capacitor is connected with the second end of the sixth resistor and the third pin of the power measurement chip, the second end of the second capacitor is connected with the first end of the third capacitor, the first end of the fourth capacitor and the first pin of the power measurement chip are jointly connected into a positive five-volt power supply, the second pin of the fourth capacitor and the fifth pin of the power measurement chip are jointly grounded, and the sixth pin of the power measurement chip is connected with the control circuit.
Further: the push-pull square wave generating circuit comprises a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a potentiometer and a push-pull square wave generating chip;
a second end of the ninth capacitor, a second end of the fourteenth resistor and a first end of the fifteenth capacitor are connected to a fourth pin of the push-pull square-wave generating chip, a first end of the eleventh capacitor is connected to a fifth pin of the push-pull square-wave generating chip, a first end and a second end of the potentiometer are connected to a sixth pin of the push-pull square-wave generating chip, the first pin of the push-pull square-wave generating chip is connected to the sixteenth pin, the second pin of the push-pull square-wave generating chip is connected to the fifteenth pin and a first end of the sixteenth resistor, an eighth pin, an eleventh pin, a twelfth pin of the push-pull square-wave generating chip and a first end of the twelfth capacitor are connected to a positive fifteen-volt power supply, a second end of the tenth capacitor, a second end of the fifteenth resistor and a second end of the eleventh capacitor are connected together, the third end of the potentiometer, the second end of the twelfth capacitor and the eighth pin of the push-pull square wave generating chip are grounded together, and the ninth pin and the tenth pin of the push-pull square wave generating chip are respectively connected to the second pin and the fourth pin of the IGBT driving chip in the IGBT negative pressure turn-off driving circuit.
Further: the IGBT negative pressure turn-off driving circuit comprises an IGBT driving chip circuit, a first path of isolation square wave output sub-circuit and a second path of isolation square wave output sub-circuit;
the IGBT driving chip circuit comprises a seventeenth resistor and a thirteenth capacitor; a sixth pin of the IGBT driving chip is connected with a second end of a seventeenth resistor and a first end of a thirteenth capacitor, the first end of the seventeenth resistor is connected with a positive fifteen-volt power supply, and the second end of the thirteenth capacitor is grounded;
the first isolation square wave output sub-circuit comprises an eighteenth resistor, a twentieth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a first inductor, a second diode, a first optocoupler, a first output end and a second output end, wherein a seventh pin of the IGBT driving chip is connected with a first end of the eighteenth resistor, a second end of the eighteenth resistor is connected with a second end of the first optocoupler, a third end of the first optocoupler is grounded, a sixth pin and a seventh pin of the first optocoupler are connected with the first output end together, a fifth pin is connected with a second end of the second diode, a second end of the fifteenth capacitor is connected with a negative electrode of the first twenty-four isolation power supply together, an eighth pin of the first optocoupler is connected with the twentieth resistor, the fourteenth capacitor and a first end of the first inductor, and a second end of the first inductor is connected with a positive electrode of the first twenty-four volt isolation power supply, a second end of the twentieth resistor, a first end of the second diode, a second end of the fourteenth capacitor and a first end of the fifteenth capacitor are connected to a second output end together;
the second path of isolation square wave output sub-circuit has the same structure as the first path of isolation square wave output sub-circuit.
Further: the control circuit comprises a fifth capacitor, a sixth capacitor and a chip STM32F103C8T 6;
the display and input circuit comprises a first switch, a second switch, a third switch, a fourth switch and an OLED display screen;
the alarm circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a first diode, a triode, a first LED, a second LED and a buzzer;
a first end of the ninth resistor is connected to a positive five-volt power supply, a second end of the ninth resistor is connected to a first end of the first diode and a first end of the buzzer, a second end of the buzzer is connected to a second end of the first diode and a first end of the triode, a second end of the tenth resistor is connected to a first end of the eleventh resistor and a third end of the triode, a second end of the eleventh resistor is connected to the third end of the triode and is grounded together, a first end of the tenth resistor is connected to a thirteenth pin of the STM32F103C8T6, a second end of the first switch, a second switch, a third switch and a fourth switch are respectively connected to a third pin, a first pin, a fourth pin and a second pin of the STM32F103C8T6, a first end of the first switch, a second switch, a third switch and a first end of the fourth switch are connected to ground together, first ends of the first LED and the second LED are respectively connected with a fifteenth pin and a fourteenth pin of the STM32F103C8T6, second ends of the first LED and the second LED are respectively connected with a twelfth resistor and a thirteenth resistor, second ends of the twelfth resistor and the thirteenth resistor are commonly connected with a three-point three-volt power supply, a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin of the OLED display screen are respectively connected with a twenty-first pin, a twenty-third pin, a twenty-sixth pin, a twenty-ninth pin, a thirty-sixth pin, a thirty-fifth pin, a thirty-fourth pin, a thirty-third pin and a twenty-sixth pin of the STM32F103C8T6, a first end of the fifth capacitor is commonly connected with a positive five-volt power supply and a twenty-point three-volt power supply of the STM32F103C8T 6335 is commonly connected with the twenty-point three-volt power supply of the STM32F103C8T 3535, the nineteenth pin of the STM32F103C8T6 is connected to the second ends of the fifth and sixth capacitors, and the twenty ninth pin, the thirtieth pin, the thirty-first pin and the thirty-second pin of the STM32F103C8T6 are connected to the first pin, the fourth pin, the second pin and the third pin of the digital-to-analog conversion chip in the digital-to-analog conversion circuit, respectively.
Further: the control circuit receives the input power transmitted by the detection circuit and processes the data, and the process of outputting the power value at the next moment is as follows:
acquiring a target power value, wherein the current range is used as a working target power and a safe current range;
acquiring input power and current value of a high-voltage alternating-current power supply used for plasma sterilization;
based on the difference value between the current power value and the target power value as an error value, a system function is set through an RBF neural network;
and updating the proportional and integral parameters in the PI control in real time according to the set system function, realizing the self-adaptive function of the load and obtaining the power value at the next moment.
The invention provides a power supply control system for a plasma sterilization device, which adopts a method for controlling input power to indirectly control the output power of a power supply because the input power detection of a plasma load is easy to implement and has low cost; the error range of the output power is enabled to be within an allowable range and the cost for the plasma load power detection is reduced;
the duty ratio of a switching tube of an AC high-voltage power supply used in industry is controlled by adopting an RBF-PI self-adaptive control mode so as to regulate output power, so that the self-adaption to load change is achieved, and the robustness of a control system is improved;
the key and the OLED screen are adopted to realize a man-machine interaction function, a user can conveniently adjust the target power and the normal working current range of the power supply, when abnormal working conditions occur, the control circuit controls the power supply to be cut off, and the LED and the buzzer are used to realize an alarm function. The stability of plasma sterilizing equipment and sterilizing effect has been improved. The application has the following advantages: the invention has the advantages and positive effects that:
(1) the invention adopts the input power detection mode to indirectly control the output power, so that the error range of the output power is in an allowable range and the cost for detecting the plasma load power is reduced.
(2) The method adopts the RBF radial basis function neural network to set the system function on line, and updates the PI parameter in real time according to the system function set by the neural network, thereby realizing the self-adaption to the load and improving the stability of the power control system.
(3) The invention adopts the mode of detecting the input current to judge whether the load is in a normal working state, thereby ensuring the safety and the effectiveness of the system.
(4) The invention adopts the user interaction mode of OLED and keys to set the target power and the current range of normal operation, has higher stability compared with the mode of a potentiometer commonly used in industry, and is more convenient for the operation of a user.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic block diagram of a control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a plasma power control circuit in an embodiment of the present invention.
Detailed Description
It should be noted that, in the case of conflict, the embodiments and features of the embodiments of the present invention may be combined with each other, and the present invention will be described in detail with reference to the accompanying drawings and embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in fig. 1, which shows a schematic block diagram of a power control system for a plasma sterilization device in an embodiment of the present invention, the control system includes a detection circuit 1, a control circuit 2, a digital-to-analog conversion circuit 3, a push-pull square wave generation circuit 4, an IGBT negative pressure turn-off drive circuit 5, an alarm circuit 6, and a display and input circuit 7;
the detection circuit 1 comprises three input ends, is connected with the input end of the plasma power supply, and is used for detecting the input power and the input current value of the plasma power supply and sending the power value and current-only data to the control circuit 2;
the chip STM32F103C8T6 in the control circuit 2 integrates an RBF radial basis function neural network and a PI controller,
the control circuit 2 receives the power value and the current value of the detection circuit 1, and sends the data of the power value sent by the detection circuit 1 after being processed by the program to the digital-to-analog conversion circuit 3,
the control circuit 2 receives the target power and the safe current range input by the display and input circuit, compares the target power and the safe current range with the input power of the high-voltage alternating current power supply used for plasma sterilization and the power detected by the input current transmitted by the detection circuit, and outputs a real-time control signal; controlling the input power of a high-voltage alternating-current power supply used for plasma sterilization, and tracking the target power input by an input circuit; when the input current of a high-voltage alternating current power supply used for plasma sterilization does not accord with the safe current range, outputting an alarm signal;
judging whether to trigger an alarm circuit 6 according to the current value sent by the detection circuit 1, setting a target power value and a safe working current value range according to the time for pressing the key of the input and display and circuit 7, and driving an OLED display screen of the input and display circuit 7 to display the current power value, the current value, the set target power value and the safe working current value range;
the digital-to-analog conversion circuit 3 receives the data sent by the main control chip 2, converts the data into a corresponding analog voltage value and outputs the analog voltage value to the push-pull square wave generating circuit 4;
the push-pull square wave generating circuit 4 adjusts the duty ratio of the two push-pull square waves output by the push-pull square wave generating circuit according to the analog voltage value output by the analog-to-digital conversion circuit, and outputs the two push-pull square waves to the IGBT negative pressure turn-off driving circuit 5; the push-pull square wave generating circuit 5 adjusts the duty ratio of the square wave according to the analog voltage value of the digital-to-analog conversion circuit 3, and controls the conduction time of the IGBT of the plasma sterilization device power supply in each period to control the power output of the power supply;
the IGBT negative pressure turn-off driving circuit 5 comprises four input ends and four output ends, the four input ends are connected with two paths of isolation power supplies provided by the plasma sterilization power supply, the IGBT negative pressure turn-off driving circuit 5 converts two paths of push-pull square waves of the push-pull square wave generating circuit 4 into two paths of isolated alternating current square waves, the two paths of alternating current square waves are added to two paths of switching tubes of the plasma sterilization power supply through the four output ends, and the conduction time of the switching tubes is adjusted so as to adjust the output power.
The alarm circuit 6 realizes the alarm of an LED display lamp and a buzzer under the control of the main control chip; if the current value is not within the set safe current value range, the main control chip controls the LED and the buzzer to alarm and outputs digital-to-analog conversion data as the maximum value to enable the turn-on time of the IGBT to be zero;
the display and input circuit 7 sets the ranges of the target power and the normal working current value in the main control chip circuit in a key mode, and displays the input power value, the input current value, the target power value and the normal working current value range of the current plasma sterilization power supply through communication with the main control chip.
Fig. 2 is a circuit diagram of a plasma power control circuit according to an embodiment of the present invention.
The detection circuit 1 comprises a first input end, a second input end, a third input end, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a current type voltage transformer, a current transformer and a power measurement chip;
the first input end is connected with the first end of the first resistor,
two ends of the primary side of the current type voltage transformer are respectively connected with the second end and the second input end of the first resistor, the secondary side of the current type voltage transformer is connected with the second resistor in parallel,
the first end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the first capacitor, the second end of the second resistor is connected with the second end of the first capacitor and the fourth pin of the power sampling chip, the second end of the first capacitor is grounded,
the current transformer is connected with the fourth resistor in parallel, the first end and the second end of the fourth resistor are respectively connected with the first end of the fifth resistor and the first end of the sixth resistor, the first end of the second capacitor is connected with the second end of the fifth resistor and the second pin of the power measurement chip, the second end of the third capacitor is connected with the second end of the sixth resistor and the third pin of the power measurement chip, the second end of the second capacitor is connected with the first end of the third capacitor, the first end of the fourth capacitor and the first pin of the power measurement chip are jointly connected into a positive five-volt power supply, the second pin of the fourth capacitor and the fifth pin of the power measurement chip are jointly grounded, and the sixth pin of the power measurement chip is connected with the control circuit.
The first input end and the second input end of the detection circuit 1 are respectively connected with a zero line and a live line input by a plasma power supply, the zero line or the live line at the input end of the plasma power supply penetrates through the third input end of the detection circuit 1, namely a current transformer, the HLW8032 power detection chip in the detection circuit 1 realizes the isolation detection of the input power and the current of the plasma power supply through a peripheral circuit thereof, and transmits the input power and the input current value to the main control chip in a serial port communication mode;
the control circuit 2 comprises a fifth capacitor, a sixth capacitor and a chip STM32F103C8T 6;
the main control chip in the control circuit 2 is STM32F103C8T6, the main control chip takes the power and current value sent by the detection circuit 1 received at the current moment as the power value and current value of the plasma sterilization power supply,
the main control chip 2 is integrated with an RBF neural network and a PI controller, a user sets a target power in the main control chip through the pressing time of a first key and a second key in a display and input circuit 7, the control circuit 2 sets a system function through the RBF radial basis function neural network according to the error between the input power of the plasma power supply and a target power value at the past moment and the duty ratio information output by the main control chip, and adjusts the proportional coefficient and the integral coefficient of PI control in real time according to the system function, so as to realize self-adaption to load change and improve the robustness of the control system, and the user can set a current value range of normal work of the power supply through the pressing time of the first key and the second key in the display and input circuit 7 according to the actual use condition,
the control circuit 2 sends data of an error between the current power and the target power after being processed by a PI program to the digital-to-analog conversion circuit 3 in an SPI communication mode, when an input current value is not in a normal working range, the control circuit 2 sends data 1023 to the digital-to-analog conversion circuit in the SPI communication mode, and the levels of a 14 th pin and a 15 th pin of the control circuit 2 are pulled down, and the level of a 13 th pin is pulled up;
the main component of the digital-to-analog conversion circuit 3 is XD5615, the XD5615 communicates with the control circuit 2 through SPI communication, a sixth pin of the XD5615 is connected to a seventh resistor, the eighth resistor divides a voltage value obtained by five-volt voltage generated by a push-pull square wave generating chip in the push-pull square wave generating circuit 4 into five-volt voltage, and the voltage value is used as a reference voltage value, when data received by the XD5615 changes from 0 to 1023, a level value output by the seventh pin of the XD5615 changes from 0 to 2 times of the reference voltage value, and the level value is output to the push-pull square wave generating circuit 4;
the main element of the push-pull square wave generating circuit 4 is a push-pull square wave generating chip TL494, the output level of the digital-to-analog conversion circuit 3 is used as a modulation wave, the TL494 adjusts the frequency of the carrier wave according to the values of the eleventh capacitor and the potentiometer, when the value of the modulation wave changes from 0 to 3.5V, the duty ratio of the two push-pull square waves output by the TL494 changes from maximum to 0, and the push-pull square waves are sent to the IGBT negative-pressure turn-off driving circuit 5;
the push-pull square wave generating circuit 4 comprises a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a potentiometer and a push-pull square wave generating chip;
a second end of the ninth capacitor, a second end of the fourteenth resistor and a first end of the fifteenth capacitor are jointly connected to a fourth pin of the push-pull square wave generating chip, a first end of the eleventh capacitor is connected to a fifth pin of the push-pull square wave generating chip, a first end and a second end of the potentiometer are connected to a sixth pin of the push-pull square wave generating chip, the first pin of the push-pull square wave generating chip is connected to the sixteenth pin, the second pin of the push-pull square wave generating chip is connected to the fifteenth pin and a first end of the sixteenth resistor, an eighth pin, an eleventh pin, a twelfth pin and a first end of the twelfth capacitor are jointly connected to a positive fifteen-volt power supply, a second end of the tenth capacitor, a second end of the fifteenth resistor and a second end of the eleventh capacitor, the third end of the potentiometer, the second end of the twelfth capacitor and the eighth pin of the push-pull square wave generating chip are grounded together, and the ninth pin and the tenth pin of the push-pull square wave generating chip are respectively connected to the second pin and the fourth pin of the IGBT driving chip in the IGBT negative pressure turn-off driving circuit.
The IGBT negative pressure turn-off driving circuit (5) comprises an IGBT driving chip circuit, a first path of isolation square wave output sub-circuit and a second path of isolation square wave output sub-circuit;
the IGBT driving chip circuit comprises a seventeenth resistor and a thirteenth capacitor; a sixth pin of the IGBT driving chip is connected with a second end of a seventeenth resistor and a first end of a thirteenth capacitor, the first end of the seventeenth resistor is connected with a positive fifteen-volt power supply, and the second end of the thirteenth capacitor is grounded;
the first isolation square wave output sub-circuit comprises an eighteenth resistor, a twentieth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a first inductor, a second diode, a first optical coupler, a first output end and a second output end, wherein a seventh pin of the IGBT driving chip is connected with a first end of the eighteenth resistor, a second end of the eighteenth resistor is connected with a second end of the first optical coupler, a third end of the first optical coupler is grounded, a sixth pin and a seventh pin of the first optical coupler are connected with the first output end together, a fifth pin is connected with a second end of the second diode, a second end of the fifteenth capacitor is connected with a negative electrode of the first twenty-four isolation power supply together, an eighth pin of the first optical coupler is connected with the twentieth resistor, the fourteenth capacitor and a first end of the first inductor are connected with each other
A second end of the first inductor is connected to an anode of a first path of twenty-four volt isolated power supply, and a second end of the twentieth resistor, a first end of the second diode, a second end of the fourteenth capacitor and a first end of the fifteenth capacitor are connected to a second output end together;
the second path of isolation square wave output sub-circuit has the same structure as the first path of isolation square wave output sub-circuit.
The IGBT negative pressure turn-off driving circuit 5 comprises a fourth input end, a fifth input end, a sixth input end, a seventh input end, a first output end, a second output end, a third output end and a fourth output end,
wherein the fourth input end and the fifth input end are respectively connected with the anode and the cathode of a first path of isolated power supply provided by the plasma power supply, the sixth input end and the seventh input end are respectively connected with the anode and the cathode of a second path of isolated power supply provided by the plasma power supply, the second pin and the third pin of TC4427 in the IGBT negative pressure turn-off driving circuit 5 are respectively connected with the tenth pin and the ninth pin of TL494 in the push-pull square wave generating circuit, so as to improve the maximum driving current value of the driving circuit, the seventh pin and the fifth pin of TC4427 are respectively connected with the second pin of the first optical coupler and the second optical coupler through an eighteenth resistor and a nineteenth resistor, the model of the first optical coupler and the second optical coupler is FOD3120SD, the first optical coupler and the second optical coupler convert the two paths of alternating current push-pull square waves output by the push-pull generating circuit 4 into two paths of isolated square waves through the peripheral circuits thereof, and the first output end and the second output end are respectively connected to the grid electrode and the collector electrode of the first switching tube of the plasma power supply, the third output end and the fourth output end are respectively connected to the grid electrode and the collector electrode of the second switching tube of the plasma power supply and are used for driving the two switching tubes, the conduction time of the two switching tubes is controlled, and the adjustment of the output power is further realized.
The display and input circuit comprises a first switch, a second switch, a third switch, a fourth switch and an OLED display screen;
the alarm circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a first diode, a triode, a first LED, a second LED and a buzzer;
a first end of the ninth resistor is connected to a positive five-volt power supply, a second end of the ninth resistor is connected to a first end of the first diode and a first end of the buzzer, a second end of the buzzer is connected to a second end of the first diode and a first end of the triode, a second end of the tenth resistor is connected to a first end of the eleventh resistor and a third end of the triode, a second end of the eleventh resistor is connected to the third end of the triode and is grounded together, a first end of the tenth resistor is connected to a thirteenth pin of the STM32F103C8T6, a second end of the first switch, a second switch, a third switch and a fourth switch are respectively connected to a third pin, a first pin, a fourth pin and a second pin of the STM32F103C8T6, a first end of the first switch, a second switch, a third switch and a first end of the fourth switch are connected to ground together, first ends of the first LED and the second LED are respectively connected with a fifteenth pin and a fourteenth pin of the STM32F103C8T6, second ends of the first LED and the second LED are respectively connected with a twelfth resistor and a thirteenth resistor, second ends of the twelfth resistor and the thirteenth resistor are commonly connected with a three-point three-volt power supply, a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin of the OLED display screen are respectively connected with a twenty-first pin, a twenty-third pin, a twenty-sixth pin, a twenty-ninth pin, a thirty-sixth pin, a thirty-fifth pin, a thirty-fourth pin, a thirty-third pin and a twenty-sixth pin of the STM32F103C8T6, a first end of the fifth capacitor is commonly connected with a positive five-volt power supply and a twenty-point three-volt power supply of the STM32F103C8T 6335 is commonly connected with the twenty-point three-volt power supply of the STM32F103C8T 3535, the nineteenth pin of the STM32F103C8T6 is connected with the second ends of the fifth capacitor and the sixth capacitor, and the twenty ninth pin, the thirtieth pin, the thirty-first pin and the thirty-second pin of the STM32F103C8T6 are respectively connected with the first pin, the fourth pin, the second pin and the third pin of the digital-to-analog conversion chip in the digital-to-analog conversion circuit (3). A first LED and a second LED in the alarm circuit 6 respectively light an alarm when the outputs of a thirteenth pin and a fourteenth pin of the main control chip STM32F103C8T6 are low levels, and a triode in the alarm circuit 6 is turned on when the output of the thirteenth pin of the main control chip STM32F103C8T6 is high voltage and drives a buzzer to alarm;
first switch, second switch, third switch, fourth switch in the demonstration and input circuit 7 are adjusted through the mode that the button is pressed the time that the third pin, first pin, fourth pin, the second pin of main control chip STM32F103C8T6 insert the low level, its inside register value is adjusted through the ground connection time of discernment every pin to main control chip STM32F103C8T6, and the current power value that main control chip STM32F103C8T6 sent, current value, target power value to and the current value scope of normal work are received to the OLED display screen in the demonstration and input circuit 7 through the communication mode of SPI and are shown.
Further, the control circuit 2 outputs the power value at the next time based on the input power received from the detection circuit 1 and the data processing, as follows:
acquiring a target power value, wherein the current range is used as a working target power and a safe current range;
acquiring input power and current value of a high-voltage alternating-current power supply used for plasma sterilization;
based on the difference value between the current power value and the target power value as an error value, a system function is set through an RBF neural network;
and updating the proportional and integral parameters in the PI control in real time according to the set system function, realizing the self-adaptive function of the load and obtaining the power value at the next moment.
Finally, it should be noted that: the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and various media capable of storing program codes.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A power control system for a plasma sterilization apparatus, characterized in that: the method comprises the following steps:
a detection circuit for detecting the input power and input current of a high-voltage alternating-current power supply used for plasma sterilization;
the display and input circuit is used for displaying and setting a target power value, and the current range is used as the working target power and the safe current range;
the control circuit receives the input power transmitted by the detection circuit, processes the data and outputs the power value at the next moment; the control circuit receives the target power and the safe current range input by the display and input circuit, compares the target power and the safe current range with the input power of the high-voltage alternating current power supply used for plasma sterilization and the power detected by the input current, which are transmitted by the detection circuit, outputs a real-time control signal, controls the input power of the high-voltage alternating current power supply used for plasma sterilization, and tracks the target power input by the input circuit; when the input current of a high-voltage alternating current power supply used for plasma sterilization does not accord with the safe current range, outputting an alarm signal;
the digital-to-analog conversion circuit receives the processed digital signal transmitted by the control circuit and converts the digital signal into an analog signal;
the push-pull square wave generating circuit receives the analog signal transmitted by the digital-to-analog conversion circuit, and adjusts the duty ratio according to the value of the analog signal to obtain a square wave signal;
the IGBT negative pressure turn-off driving circuit receives the square wave signals transmitted by the push-pull square wave generating circuit, processes the square wave signals into two paths of isolated square waves and outputs the isolated square waves to realize the adjustment of the power output power of the plasma sterilization device;
and the alarm circuit receives the control signal of the control circuit to give an alarm when the current value is not within the set safe current value range.
2. The power control system for a plasma sterilization apparatus according to claim 1, wherein: the detection circuit comprises a first input end, a second input end, a third input end, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a current type voltage transformer, a current transformer and a power measurement chip;
the first input end is connected with the first end of the first resistor,
two ends of the primary side of the current type voltage transformer are respectively connected with the second end and the second input end of the first resistor, the secondary side of the current type voltage transformer is connected with the second resistor in parallel,
the first end of the second resistor is connected with the first end of the third resistor, the second end of the third resistor is connected with the first end of the first capacitor, the second end of the second resistor is connected with the second end of the first capacitor and the fourth pin of the power sampling chip, the second end of the first capacitor is grounded,
the current transformer is connected with the fourth resistor in parallel, the first end and the second end of the fourth resistor are respectively connected with the first end of the fifth resistor and the first end of the sixth resistor, the first end of the second capacitor is connected with the second end of the fifth resistor and the second pin of the power measurement chip, the second end of the third capacitor is connected with the second end of the sixth resistor and the third pin of the power measurement chip, the second end of the second capacitor is connected with the first end of the third capacitor, the first end of the fourth capacitor and the first pin of the power measurement chip are jointly connected into a positive five-volt power supply, the second pin of the fourth capacitor and the fifth pin of the power measurement chip are jointly grounded, and the sixth pin of the power measurement chip is connected with the control circuit.
3. The power control circuit for a plasma sterilization apparatus according to claim 1, wherein:
the push-pull square wave generating circuit comprises a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a potentiometer and a push-pull square wave generating chip;
a second end of the ninth capacitor, a second end of the fourteenth resistor and a first end of the fifteenth capacitor are jointly connected to a fourth pin of the push-pull square wave generating chip, a first end of the eleventh capacitor is connected to a fifth pin of the push-pull square wave generating chip, a first end and a second end of the potentiometer are connected to a sixth pin of the push-pull square wave generating chip, the first pin of the push-pull square wave generating chip is connected to the sixteenth pin, the second pin of the push-pull square wave generating chip is connected to the fifteenth pin and a first end of the sixteenth resistor, an eighth pin, an eleventh pin, a twelfth pin and a first end of the twelfth capacitor are jointly connected to a positive fifteen-volt power supply, a second end of the tenth capacitor, a second end of the fifteenth resistor and a second end of the eleventh capacitor, the third end of the potentiometer, the second end of the twelfth capacitor and the eighth pin of the push-pull square wave generating chip are grounded together, and the ninth pin and the tenth pin of the push-pull square wave generating chip are respectively connected to the second pin and the fourth pin of the IGBT driving chip in the IGBT negative pressure turn-off driving circuit.
4. The power control circuit for a plasma sterilization device according to claim 1, wherein:
the IGBT negative pressure turn-off driving circuit comprises an IGBT driving chip circuit, a first path of isolation square wave output sub-circuit and a second path of isolation square wave output sub-circuit;
the IGBT driving chip circuit comprises a seventeenth resistor and a thirteenth capacitor; a sixth pin of the IGBT driving chip is connected with a second end of a seventeenth resistor and a first end of a thirteenth capacitor, the first end of the seventeenth resistor is connected with a positive fifteen-volt power supply, and the second end of the thirteenth capacitor is grounded;
the first isolation square wave output sub-circuit comprises an eighteenth resistor, a twentieth resistor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, a first inductor, a second diode, a first optocoupler, a first output end and a second output end, wherein a seventh pin of the IGBT driving chip is connected with a first end of the eighteenth resistor, a second end of the eighteenth resistor is connected with a second end of the first optocoupler, a third end of the first optocoupler is grounded, a sixth pin and a seventh pin of the first optocoupler are connected with the first output end together, a fifth pin is connected with a second end of the second diode, a second end of the fifteenth capacitor is connected with a negative electrode of the first twenty-four isolation power supply together, an eighth pin of the first optocoupler is connected with the twentieth resistor, the fourteenth capacitor and a first end of the first inductor, and a second end of the first inductor is connected with a positive electrode of the first twenty-four volt isolation power supply, a second end of the twentieth resistor, a first end of the second diode, a second end of the fourteenth capacitor and a first end of the fifteenth capacitor are connected to a second output end together;
the second path of isolation square wave output sub-circuit has the same structure as the first path of isolation square wave output sub-circuit.
5. The power control circuit for a plasma sterilization apparatus according to claim 1, wherein: the control circuit comprises a fifth capacitor, a sixth capacitor and a chip STM32F103C8T 6;
the display and input circuit comprises a first switch, a second switch, a third switch, a fourth switch and an OLED display screen;
the alarm circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a first diode, a triode, a first LED, a second LED and a buzzer;
a first end of the ninth resistor is connected to a positive five-volt power supply, a second end of the ninth resistor is connected to a first end of the first diode and a first end of the buzzer, a second end of the buzzer is connected to a second end of the first diode and a first end of the triode, a second end of the tenth resistor is connected to a first end of the eleventh resistor and a third end of the triode, a second end of the eleventh resistor is connected to the third end of the triode and is grounded together, a first end of the tenth resistor is connected to a thirteenth pin of the STM32F103C8T6, a second end of the first switch, a second switch, a third switch and a fourth switch are respectively connected to a third pin, a first pin, a fourth pin and a second pin of the STM32F103C8T6, a first end of the first switch, a second switch, a third switch and a first end of the fourth switch are connected to ground together, first ends of the first LED and the second LED are respectively connected with a fifteenth pin and a fourteenth pin of the STM32F103C8T6, second ends of the first LED and the second LED are respectively connected with a twelfth resistor and a thirteenth resistor, second ends of the twelfth resistor and the thirteenth resistor are commonly connected with a three-point three-volt power supply, a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin of the OLED display screen are respectively connected with a twenty-first pin, a twenty-third pin, a twenty-sixth pin, a twenty-ninth pin, a thirty-sixth pin, a thirty-fifth pin, a thirty-fourth pin, a thirty-third pin and a twenty-sixth pin of the STM32F103C8T6, a first end of the fifth capacitor is commonly connected with a positive five-volt power supply and a twenty-point three-volt power supply of the STM32F103C8T 6335 is commonly connected with the twenty-point three-volt power supply of the STM32F103C8T 3535, the nineteenth pin of the STM32F103C8T6 is connected to the second ends of the fifth and sixth capacitors, and the twenty ninth pin, the thirtieth pin, the thirty-first pin and the thirty-second pin of the STM32F103C8T6 are connected to the first pin, the fourth pin, the second pin and the third pin of the digital-to-analog conversion chip in the digital-to-analog conversion circuit, respectively.
6. The power control circuit for a plasma sterilization apparatus according to claim 1, wherein: the control circuit receives the input power transmitted by the detection circuit and processes the data, and the process of outputting the power value at the next moment is as follows:
acquiring a target power value, wherein the current range is used as a working target power and a safe current range;
acquiring input power and current value of a high-voltage alternating-current power supply used for plasma sterilization;
based on the difference value between the current power value and the target power value as an error value, a system function is set through an RBF neural network;
and updating the proportional and integral parameters in the PI control in real time according to the set system function, realizing the self-adaptive function of the load and obtaining the power value at the next moment.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210869203.9A CN115117843B (en) | 2022-07-21 | Power supply control system for plasma sterilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210869203.9A CN115117843B (en) | 2022-07-21 | Power supply control system for plasma sterilization device |
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| CN115117843B CN115117843B (en) | 2024-07-05 |
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