Photovoltaic system based on microprocessor and used for preventing hot spot effect of photovoltaic module
阅读说明：本技术 一种基于微处理器的防止光伏组件热斑效应的光伏系统 (Photovoltaic system based on microprocessor and used for preventing hot spot effect of photovoltaic module ) 是由 丁利民 朱佳琪 何斌 李冉 赵钧儒 周承斌 张林明 邓征 于 2019-03-19 设计创作，主要内容包括：本发明提供了一种基于微处理器的防止光伏组件热斑效应的光伏系统,包括串联的多个光伏组件,每个光伏组件包括多个光伏电池单元；电压检测器,连接各个光伏组件的两端,用于采集各个光伏组件的电压值；可控开关,连接该多个光伏组件；以及控制装置,连接该电压检测器和可控开关,且根据各个电压值控制该可控开关的状态,从而决定该多个光伏组件是否接入该光伏系统。该光伏系统可以有效的保护光伏组件中的光伏电池单元在使用周期内不会因为热斑效应而损坏。(The invention provides a microprocessor-based photovoltaic system for preventing hot spot effect of photovoltaic modules, which comprises a plurality of photovoltaic modules connected in series, wherein each photovoltaic module comprises a plurality of photovoltaic battery units; the voltage detector is connected with two ends of each photovoltaic module and used for collecting the voltage value of each photovoltaic module; the controllable switch is connected with the photovoltaic modules; and the control device is connected with the voltage detector and the controllable switch and controls the state of the controllable switch according to each voltage value so as to determine whether the photovoltaic components are connected into the photovoltaic system or not. The photovoltaic system can effectively protect the photovoltaic cell units in the photovoltaic module from being damaged due to the hot spot effect in the service cycle.)
1. A microprocessor-based photovoltaic system for preventing hot-spotting effects on photovoltaic modules, comprising:
a plurality of photovoltaic modules connected in series, each photovoltaic module comprising a plurality of photovoltaic cells;
the voltage detector is connected with two ends of each photovoltaic module and used for collecting the voltage value of each photovoltaic module;
the controllable switch is connected with the photovoltaic components; and
and the control device is connected with the voltage detector and the controllable switch and controls the state of the controllable switch according to each voltage value so as to determine whether the photovoltaic components are connected into the photovoltaic system or not.
2. The photovoltaic system of claim 1, wherein the controllable switch comprises a first switch and a second switch connected in series across the plurality of photovoltaic modules.
3. The photovoltaic system of claim 1, wherein the controllable switches comprise a plurality of switch sets, each switch set comprising a first switch and a second switch connected in series across each photovoltaic module and a third switch connected in parallel across each photovoltaic module.
4. The photovoltaic system of claim 1, wherein the control device comprises:
the microprocessor is connected with the voltage detector and determines a plurality of control signals according to the voltage values;
the digital-to-analog converter is connected with the microprocessor and used for converting the plurality of control signals;
and the driver is connected with the digital-to-analog converter and the controllable switch and used for generating a plurality of driving signals according to the plurality of control signals and outputting the driving signals to the controllable switch.
5. The photovoltaic system of claim 4, wherein the microprocessor is configured to:
calculating an average voltage of the plurality of photovoltaic modules;
calculating a difference between the minimum voltage and the average voltage of the plurality of photovoltaic modules; and
when the difference value is larger than a threshold value, determining that the photovoltaic components or the photovoltaic component with the minimum voltage stop accessing the photovoltaic system.
6. The photovoltaic system of claim 5, wherein the microprocessor is further configured to:
calculating an average voltage of the plurality of photovoltaic modules;
calculating a difference between the minimum voltage and the average voltage of the plurality of photovoltaic modules; and
when the difference is smaller than or equal to the threshold value, the photovoltaic components or the photovoltaic component with the minimum voltage are determined to be connected to the photovoltaic system.
7. Photovoltaic system according to claim 5 or 6, characterized in that the threshold value is 10% of the average voltage.
8. The photovoltaic system of claim 4, wherein the driver has a time delay.
9. The pv system of claim 1 further comprising a pv inverter connected across the pv modules.
Technical Field
The invention mainly relates to the field of solar energy, in particular to a photovoltaic system for preventing hot spot effect of a photovoltaic module based on a microprocessor.
Background
Photovoltaic modules, also called solar panels, are the core part of solar power generation systems. The photovoltaic module is used for converting solar energy into electric energy and transmitting the electric energy to a storage battery for storage or pushing a load to work. Fig. 1 is a schematic structural diagram of a conventional photovoltaic module. Generally, a photovoltaic module is obtained by connecting
However, under certain conditions, a part of the
In order to prevent damage caused by the hot spot effect, a
Disclosure of Invention
The invention aims to provide a photovoltaic system for preventing a hot spot effect of a photovoltaic module based on a microprocessor, which can effectively protect a photovoltaic cell unit in the photovoltaic module from being damaged due to the hot spot effect in a service cycle.
In order to solve the above technical problem, the present invention provides a photovoltaic system based on a microprocessor for preventing hot spot effect of a photovoltaic module, comprising: a plurality of photovoltaic modules connected in series, each photovoltaic module comprising a plurality of photovoltaic cells; the voltage detector is connected with two ends of each photovoltaic module and used for collecting the voltage value of each photovoltaic module; the controllable switch is connected with the photovoltaic components; and the control device is connected with the voltage detector and the controllable switch and controls the state of the controllable switch according to each voltage value so as to determine whether the photovoltaic components are connected to the photovoltaic system or not.
In an embodiment of the invention, the controllable switch comprises a first switch and a second switch connected in series across the plurality of photovoltaic modules.
In an embodiment of the invention, the controllable switches comprise a plurality of switch groups, each switch group comprising a first switch and a second switch connected in series across each photovoltaic module and a third switch connected in parallel across each photovoltaic module.
In an embodiment of the present invention, the control device includes: the microprocessor is connected with the voltage detector and determines a plurality of control signals according to the voltage values; the digital-to-analog converter is connected with the microprocessor and used for converting the plurality of control signals; and the driver is connected with the digital-to-analog converter and the controllable switch and used for generating a plurality of driving signals according to the plurality of control signals and outputting the driving signals to the controllable switch.
In an embodiment of the invention, the microprocessor is configured to: calculating an average voltage of the plurality of photovoltaic modules; calculating a difference between the minimum voltage and the average voltage of the plurality of photovoltaic modules; and when the difference value is larger than a threshold value, determining that the photovoltaic components or the photovoltaic component with the minimum voltage stop accessing the photovoltaic system.
In an embodiment of the invention, the microprocessor is further configured to: calculating an average voltage of the plurality of photovoltaic modules; calculating a difference between the minimum voltage and the average voltage of the plurality of photovoltaic modules; and when the difference value is smaller than or equal to the threshold value, determining that the photovoltaic components or the photovoltaic component with the minimum voltage are connected to the photovoltaic system.
In an embodiment of the invention, the threshold is 10% of the average voltage.
In an embodiment of the invention, the driver has a time delay.
In an embodiment of the invention, the photovoltaic system further comprises a photovoltaic inverter connected at both ends of the plurality of photovoltaic modules.
Compared with the prior art, the invention has the following advantages: detecting a photovoltaic module connected in series in a photovoltaic system, and when a photovoltaic cell unit in the photovoltaic module is shielded, protecting the photovoltaic system and the photovoltaic cell unit from being damaged due to the influence of a hot spot effect even if the photovoltaic module connected in series stops being connected into the photovoltaic system; each photovoltaic module in the photovoltaic system is detected, and when any one photovoltaic module is shielded, the photovoltaic module is stopped to be connected into the photovoltaic system, so that the precise and precise control of the photovoltaic module is realized; after the influence of the hot spot effect is eliminated, the photovoltaic module which is stopped to be connected into the photovoltaic system can be connected into the photovoltaic system again to generate electric energy, and the output of the photovoltaic system is ensured.
Drawings
FIG. 1 is a schematic diagram of a photovoltaic module with bypass diodes connected in parallel;
FIG. 2 is a schematic structural diagram of a photovoltaic system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a photovoltaic system according to another embodiment of the present invention;
fig. 4 is a block diagram of a control device in a photovoltaic system according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.
As used in this application and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.
In describing the embodiments of the present invention in detail, the cross-sectional views illustrating the structure of the device are not enlarged partially in a general scale for convenience of illustration, and the schematic drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
For convenience in description, spatial relational terms such as "below," "beneath," "below," "under," "over," "upper," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that these terms of spatial relationship are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary words "below" and "beneath" can encompass both an orientation of up and down. The device may have other orientations (rotated 90 degrees or at other orientations) and the spatial relationship descriptors used herein should be interpreted accordingly. Further, it will also be understood that when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.
In the context of this application, a structure described as having a first feature "on" a second feature may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features are formed in between the first and second features, such that the first and second features may not be in direct contact.
It will be understood that when an element is referred to as being "on," "connected to," "coupled to" or "contacting" another element, it can be directly on, connected or coupled to, or contacting the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly on," "directly connected to," "directly coupled to" or "directly contacting" another element, there are no intervening elements present. Similarly, when a first component is said to be "in electrical contact with" or "electrically coupled to" a second component, there is an electrical path between the first component and the second component that allows current to flow. The electrical path may include capacitors, coupled inductors, and/or other components that allow current to flow even without direct contact between the conductive components.
Fig. 2 is a schematic structural diagram of a photovoltaic system according to an embodiment of the present invention. Referring to fig. 2, the photovoltaic system comprises a plurality of photovoltaic modules 20, a voltage detector 30, a controllable switch 40 and a control device 50 connected in series. Wherein each photovoltaic module 20 comprises a plurality of photovoltaic cells. The voltage detector 30 is connected to two ends of each photovoltaic module 20, and is used for collecting the voltage value of each photovoltaic module 20. The controllable switch 40 is used to connect a plurality of photovoltaic modules 20. The control device 50 is connected to the voltage detector 30 and the controllable switch 40. The voltage value of each photovoltaic module 20 detected by the voltage detector 30 is sent to the control device 50, and the control device 50 controls the state of the controllable switch 40 according to the voltage value of each photovoltaic module 20, so as to determine whether each photovoltaic module is connected to the photovoltaic system.
In some embodiments, the controllable switch 40 comprises a first switch 41 and a second switch 42. The first switch 41 and the second switch 42 are respectively connected in series at two ends of the plurality of photovoltaic modules 20. Referring to fig. 2, it is assumed that n photovoltaic modules, respectively designated as 21 and 22 … 2n, are connected in series in the photovoltaic system. The first switch 41 has one end connected in series to the first photovoltaic module 21 of the n photovoltaic modules 20, and the other end connected to the control device 50. One end of the second switch 42 is connected in series with the last photovoltaic module 2n of the n photovoltaic modules 20, and the other end is connected to the control device 50.
It should be noted that the photovoltaic system of the present invention is formed by connecting multiple sets of photovoltaic modules 20 in series in parallel, and is shown with reference to fig. 1. The focus of the present description is on the description of the series-connected photovoltaic modules 20, and a group of series-connected photovoltaic modules 20 constitutes a group of strings of photovoltaic modules. The photovoltaic module string connecting method can be applied to each group of photovoltaic module strings connected in parallel in the photovoltaic system, and can also be applied to partial photovoltaic module strings connected in parallel in the photovoltaic system.
In designing the photovoltaic module 20, the lighting environment of a plurality of photovoltaic modules 20 connected in series is designed according to the requirement of consistency. That is, at the same time point, the illumination received by each of the photovoltaic modules 20 is theoretically the same, and therefore, the voltage output by each of the photovoltaic modules 20 should be the same.
In the above embodiment, when the photovoltaic module 20 is shielded and cannot be illuminated or the illumination received by the photovoltaic module is weakened, the voltage value detected by the voltage detector 30 changes, and the control device 50 controls the first switch 41 and the second switch 42 to be turned off according to the voltage value sent by the voltage detector 30, so that the plurality of photovoltaic modules 20 are disconnected from the photovoltaic system, thereby playing a role in protecting the whole photovoltaic system. It can be understood that, since the group of photovoltaic module strings are connected in parallel in the photovoltaic system, there is no influence on the entire photovoltaic system and other photovoltaic module strings in the photovoltaic system.
It should be noted that, in the embodiment shown in fig. 2, when the first switch 41 and the second switch 42 are turned off, the operation of the voltage detector 30 is not affected, and each photovoltaic module 20 is still connected in parallel with the voltage detector 30. The voltage detector 30 may continue to measure the voltage across each photovoltaic module 20, where the measured voltage is the no-load voltage of the plurality of photovoltaic modules 20. In the case that the photovoltaic module 20 is only temporarily blocked, when the voltage detector 30 measures that the voltage across the photovoltaic module 20 is restored to a normal level, the control device 50 may control the first switch 41 and the second switch 42 to be closed, so that the group of the plurality of photovoltaic modules 20 connected in series is reconnected to the whole photovoltaic system.
Fig. 3 is a schematic structural diagram of a photovoltaic system according to another embodiment of the present invention. Referring to fig. 3, the photovoltaic system of the present embodiment includes a plurality of photovoltaic modules 20, a voltage detector 30, a controllable switch 40, and a control device 50 connected in series. The controllable switch 40 includes a plurality of switch groups, each of which includes a first switch 41, a second switch 42 connected in series across each photovoltaic module 20, and a third switch 43 connected in parallel across each photovoltaic module 20. Referring to fig. 3, it is assumed that n photovoltaic modules, respectively labeled 21 and 22 … 2n, are connected in series in the photovoltaic system. For the first photovoltaic module 21, a first switch 411 and a second switch 421 are connected in series at both ends thereof, and a third switch 431 is connected in parallel at both ends thereof. The first switch 411, the second switch 421 and the third switch 431 constitute a switch group of the photovoltaic module 21. Similarly, for the second photovoltaic module 22, a first switch 412 and a second switch 422 are connected in series at both ends thereof, and a third switch 432 is connected in parallel at both ends thereof. The first switch 412, the second switch 422, and the third switch 432 form a switch set of the photovoltaic module 22. And the like, up to the nth photovoltaic module 2n, a first switch 41n and a second switch 42n are connected in series at two ends thereof, and a third switch 43n is connected in parallel at two ends thereof. The first switch 41n, the second switch 42n and the third switch 43n constitute a switch group of the photovoltaic module 2 n.
In the present embodiment, the voltage detector 30 detects the voltage across each photovoltaic module 20. When the photovoltaic module 20 is shielded from the light or the light is weakened, the voltage value detected by the voltage detector 30 changes. The control device 50 controls the switch groups according to the voltage values sent by the voltage detector 30, so that the first switch 41 and the second switch 42 of the photovoltaic module 20 corresponding to the voltage change are turned off, so that the photovoltaic module 20 is turned off from the group of the photovoltaic modules 20 connected in series, and the third switch 43 in the corresponding switch group is turned on, so as to ensure that the series of the photovoltaic modules 20 are not broken. For example, if a first one 21 of the photovoltaic modules 20 is blocked, the voltage detector 30 detects a change in the voltage value thereof and transmits the voltage value to the control device 50. The control device 50 determines the voltage value, and if the determination result is that the first photovoltaic module 21 needs to stop accessing the photovoltaic system, the control device 50 controls the first switch 411 and the second switch 421 to be turned off, and controls the third switch 431 to be turned on, so that the first photovoltaic module 21 is turned off from the photovoltaic system. In this way, the first photovoltaic module 21 can be protected at the same time as the remaining photovoltaic modules 20 in the photovoltaic system.
In some embodiments, the voltage detector 30 detects the voltage across the photovoltaic module 20 in real time and transmits the detected voltage value to the control device 50 in real time.
In other embodiments, the voltage detector 30 detects the voltage across the photovoltaic module 20 in non-real time, but at certain frequency intervals according to a certain set pattern. Similarly, the detected voltage value is also transmitted to the control device 50 at a constant frequency.
In some embodiments, the voltage detector 30 may determine the detected voltage value, and send the voltage value to the control device 50 only when the voltage value meets a certain predetermined requirement.
In the embodiment shown in fig. 3, since the control device 50 performs voltage detection and switching control on each photovoltaic module 21, when any one of the photovoltaic modules 21 is blocked, the photovoltaic module 21 can be disconnected from the photovoltaic system, the control is accurate, and the influence of hot spot effect on the photovoltaic system can be avoided to a great extent.
The number of switching modules may also be reduced appropriately on the basis of the embodiment shown in fig. 3, while taking into account the cost consumption associated with the switching modules. For example, the first switch 41 and the second switch 42 may be connected in series across each of two or more photovoltaic modules and the third switch 43 may be connected in parallel across the two or more photovoltaic modules.
It should be noted that, in the embodiment shown in fig. 3, when the first switch 41 and the second switch 42 are turned off and the third switch 43 is turned on, the operation of the voltage detector 30 is not affected, and each photovoltaic module 20 is still connected in parallel with the voltage detector 30. The voltage detector 30 may continue to measure the voltage across each photovoltaic module 20, where the measured voltage is the no-load voltage of each photovoltaic module 20. In the case that the photovoltaic module 20 is only temporarily blocked, when the voltage detector 30 measures that the voltage across the photovoltaic module 20 returns to a normal level, the control device 50 may control the first switch 41 and the second switch 42 to be closed, and simultaneously open the third switch 43, so that the photovoltaic module 20 is reconnected to the series string of photovoltaic modules.
Fig. 4 is a block diagram of a control device 50 in a photovoltaic system according to an embodiment of the present invention. Referring to fig. 4, the control device 50 mainly includes a microprocessor 51, a digital-to-analog converter 52, and a driver 53. The microprocessor 51 is connected to the voltage detector 30, and determines a plurality of control signals according to the voltage values of the photovoltaic modules 20 detected by the voltage detector 30. The digital-to-analog converter 52 is connected to the micro-controller 51 for converting a plurality of digital control signals of the micro-controller 51 into analog signals. The driver 53 is connected to the digital-to-analog converter 52 and the controllable switches 40, and is configured to generate a plurality of driving signals according to a plurality of control signals, and output the plurality of driving signals to the controllable switches 40, that is, the plurality of driving signals are used to control the corresponding controllable switches 40 to be turned off or on.
In some embodiments, the microprocessor 51 is configured to calculate an average voltage of the plurality of photovoltaic modules 20 and calculate a difference between a minimum voltage and the average voltage of the plurality of photovoltaic modules 20. When the difference is greater than a certain threshold, it is determined that the photovoltaic modules 20 or the photovoltaic module 20 with the minimum voltage stops accessing the photovoltaic system, so as to prevent the influence caused by the hot spot effect.
On the basis of the above embodiment, the microprocessor 51 may be further configured to determine that the photovoltaic modules 20 or the photovoltaic module 20 with the minimum voltage is connected to the photovoltaic system when the difference between the minimum voltage and the average voltage of the photovoltaic modules 20 is less than or equal to the threshold value, so that the photovoltaic modules 20 may be put into normal operation again after the risk of the hot spot effect is eliminated.
The threshold may be 1% to 10% of the average voltage of the plurality of photovoltaic modules 20 connected together in series.
Corresponding to the embodiment shown in fig. 2, the microprocessor 51 calculates an average voltage of the plurality of photovoltaic modules 20 connected in series, and calculates a difference between a minimum voltage and the average voltage of the plurality of photovoltaic modules 20. When the difference is greater than the threshold, the microprocessor 51 sends a control signal to the digital-to-analog converter 52, and the digital-to-analog converter 52 and the driver 53 generate a driving signal according to the control signal, wherein the driving signal can be output to the first switch 41 and the second switch 42 connected in series at two ends of the plurality of photovoltaic modules 20, and drive the first switch 41 and the second switch 42 to be turned off, so that the plurality of photovoltaic modules 20 stop being connected to the photovoltaic system. At this time, the voltage detector 30 still performs voltage detection on the plurality of photovoltaic modules 20. When the difference between the minimum voltage and the average voltage of the photovoltaic modules 20 is less than or equal to the threshold value, the microprocessor 51 sends a control signal to the digital-to-analog converter 52, and the digital-to-analog converter 52 and the driver 53 generate a driving signal according to the control signal, wherein the driving signal can be output to the first switch 41 and the second switch 42 which are connected in series at two ends of the photovoltaic modules 20, and drives the first switch 41 and the second switch 42 to be connected, so that the photovoltaic modules 20 are connected to the photovoltaic system.
Corresponding to the embodiment shown in fig. 3, the photovoltaic module 20 having the smallest voltage is assumed to be the nth photovoltaic module 2 n. When the difference between the minimum voltage and the average voltage is greater than the threshold value, the microprocessor 51 sends a control signal to the digital-to-analog converter 52, and the digital-to-analog converter 52 and the driver 53 generate a driving signal according to the control signal. The driving signals output to the first switch 41n, the second switch 42n and the third switch 43n at both ends of the photovoltaic module 2n can turn off the first switch 41n and the second switch 42n and turn on the third switch 43n, thereby stopping the photovoltaic module 2n from accessing the photovoltaic system. When the difference between the minimum voltage and the average voltage is less than or equal to the threshold value, the microprocessor 51 sends a control signal to the digital-to-analog converter 52, and the digital-to-analog converter 52 and the driver 53 generate a driving signal according to the control signal. The driving signals output to the first switch 41n, the second switch 42n and the third switch 43n at two ends of the photovoltaic module 2n can make the first switch 41n and the second switch 42n connected and make the third switch 43n disconnected, so that the photovoltaic module 2n is connected to the photovoltaic system.
In some embodiments, the driver 53 has a time delay. The time of the delay may be 1 minute to 10 minutes. The actuator will not issue an actuation command until after the set time delay, causing the corresponding controllable switch 40 to be opened or closed. The advantage of this arrangement is that when the photovoltaic module 20 is only temporarily shielded, the hot spot effect is not generated, and the photovoltaic module 20 and the photovoltaic system do not need to be disconnected, so that the photovoltaic system can stably operate.
In some embodiments, the controllable switch 40 in the photovoltaic system may be a relay unit, and accordingly, the driver 53 may be a relay output unit which may output the driving signal to the corresponding relay unit of the or each photovoltaic module 20.
Referring to FIG. 4, in some embodiments, control device 50 also includes an alarm module 54. When the difference between the minimum voltage and the average voltage is greater than the threshold value, i.e. there is a risk of hot spot effect in the photovoltaic system, the control device 50 outputs an alarm command to the alarm module 54 in addition to controlling the controllable switch 40. The alarm module 54 may generate an audible and visual alarm signal to alert maintenance personnel to inspect the corresponding photovoltaic module 20.
In some embodiments, the control device 50 may further include an analog-to-digital converter 55 for converting the analog voltage detected by the voltage detector 30 into a digital quantity, a power supply module 57 for supplying power to the control device 50, and a display unit 56 for displaying information. It is understood that the analog-to-digital converter 55 is not required in the control device 50 when the voltage detector 30 can directly output a digital signal to the control device 50.
In some embodiments, a photovoltaic inverter is also connected across the plurality of photovoltaic modules 20, and is capable of converting electrical energy generated by the photovoltaic system into ac power at the mains frequency for entry into the commercial power transmission system.
This application uses specific words to describe embodiments of the application. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the present application is included in at least one embodiment of the present application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the present application may be combined as appropriate.
Although the present invention has been described with reference to the present specific embodiments, it will be appreciated by those skilled in the art that the above embodiments are merely illustrative of the present invention, and various equivalent changes and substitutions may be made without departing from the spirit of the invention, and therefore, it is intended that all changes and modifications to the above embodiments within the spirit and scope of the present invention be covered by the appended claims.
- 上一篇：一种医用注射器针头装配设备
- 下一篇：一种便于移动的小型太阳能柴油发电一体机