CN106301246A - The power supply circuits of a kind of radio-frequency power amplifier and mobile terminal - Google Patents
The power supply circuits of a kind of radio-frequency power amplifier and mobile terminal Download PDFInfo
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- CN106301246A CN106301246A CN201610609376.1A CN201610609376A CN106301246A CN 106301246 A CN106301246 A CN 106301246A CN 201610609376 A CN201610609376 A CN 201610609376A CN 106301246 A CN106301246 A CN 106301246A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
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Abstract
本发明提供一种射频功率放大器的供电电路以及移动终端，该供电电路包括：电源、多个射频功率放大器、第二开关电路以及天线，其中，多个射频功率放大器与电源之间设置有第一开关电路；多个射频功率放大器中的至少一个通过第一开关电路与电源电连接；第二开关电路连接于多个射频功率放大器与天线之间，多个射频功率放大器中的至少一个通过第二开关电路与天线电连接。本发明通过在电源与射频功率放大器之间设置开关电路，避免失效的射频功率放大器对连接使用中的射频放大器的影响，提高移动终端的电源的稳定性，同时延长移动终端的使用时长。
The present invention provides a power supply circuit of a radio frequency power amplifier and a mobile terminal. The power supply circuit includes: a power supply, a plurality of radio frequency power amplifiers, a second switch circuit and an antenna, wherein a first A switch circuit; at least one of the multiple radio frequency power amplifiers is electrically connected to the power supply through the first switch circuit; the second switch circuit is connected between the multiple radio frequency power amplifiers and the antenna, and at least one of the multiple radio frequency power amplifiers is connected through the second The switch circuit is electrically connected with the antenna. In the present invention, a switch circuit is arranged between the power supply and the radio frequency power amplifier to avoid the influence of the failed radio frequency power amplifier on the connected radio frequency amplifier in use, improve the stability of the power supply of the mobile terminal, and prolong the service life of the mobile terminal at the same time.
Description
技术领域technical field
本发明涉及通信技术领域，特别是涉及一种射频功率放大器的供电电路及移动终端。The invention relates to the technical field of communication, in particular to a power supply circuit of a radio frequency power amplifier and a mobile terminal.
背景技术Background technique
目前，随着移动终端向着多模多频方向的不断发展，移动终端可支持多个频段，但由于射频功率放大器的带宽受限，所以移动终端中一般包括有多个射频功率放大器。At present, with the continuous development of mobile terminals towards multi-mode and multi-frequency, mobile terminals can support multiple frequency bands. However, due to the limited bandwidth of radio frequency power amplifiers, mobile terminals generally include multiple radio frequency power amplifiers.
由于射频功率放大器的功耗大、工艺复杂等原因，射频功率放大器的整体失效率偏高。有时射频功率放大器的失效会使得其电源管脚短路或对地阻值下降，导致系统上电时出现漏电，漏电电流从1mA～3A不等。而且，射频功率放大器失效漏电会严重缩短移动终端电池使用时间，当漏电电流大于预充阶段的充电电流时，会导致移动终端低电关机后无法开机。Due to the large power consumption and complicated process of the radio frequency power amplifier, the overall failure rate of the radio frequency power amplifier is relatively high. Sometimes the failure of the RF power amplifier will cause its power supply pins to be short-circuited or the resistance to ground will drop, resulting in leakage when the system is powered on, and the leakage current ranges from 1mA to 3A. Moreover, the failure of the RF power amplifier and the leakage will seriously shorten the battery life of the mobile terminal. When the leakage current is greater than the charging current in the pre-charging stage, it will cause the mobile terminal to fail to turn on after the low power shutdown.
如果多个射频功率放大器的电源管脚短接后一起接到开关电源，当其中一个射频功率放大器失效导致电源脚对地阻值下降后，只要开关电源一开启，失效的射频功率放大器就会漏电，如果漏电电流较大，则会导致电源不稳定从而影响其他射频功率放大器的正常工作。If the power pins of multiple RF power amplifiers are short-circuited and connected to the switching power supply together, when one of the RF power amplifiers fails and the resistance of the power pins to ground drops, as soon as the switching power supply is turned on, the failed RF power amplifier will leak , if the leakage current is large, it will lead to unstable power supply and affect the normal operation of other RF power amplifiers.
发明内容Contents of the invention
本发明实施例提供一种射频功率放大器的供电电路及移动终端，以解决现有技术中射频功率放大器失效漏电造成的移动终端电池电源不稳定以及使用时间缩短的问题。Embodiments of the present invention provide a power supply circuit of a radio frequency power amplifier and a mobile terminal, so as to solve the problems in the prior art that the battery power supply of the mobile terminal is unstable and the service time is shortened due to the failure and leakage of the radio frequency power amplifier.
一方面，本发明实施例提供一种射频功率放大器的供电电路，包括：电源、多个射频功率放大器、第二开关电路以及天线，其中，多个所述射频功率放大器与所述电源之间设置有第一开关电路；On the one hand, an embodiment of the present invention provides a power supply circuit for a radio frequency power amplifier, including: a power supply, a plurality of radio frequency power amplifiers, a second switch circuit, and an antenna, wherein a plurality of radio frequency power amplifiers and the power supply are provided between There is a first switch circuit;
多个所述射频功率放大器中的至少一个通过所述第一开关电路与所述电源电连接；At least one of the plurality of radio frequency power amplifiers is electrically connected to the power supply through the first switch circuit;
所述第二开关电路连接于多个所述射频功率放大器与所述天线之间，多个所述射频功率放大器中的至少一个通过所述第二开关电路与所述天线电连接。The second switch circuit is connected between the plurality of radio frequency power amplifiers and the antenna, and at least one of the plurality of radio frequency power amplifiers is electrically connected to the antenna through the second switch circuit.
另一方面，本发明实施例还提供一种移动终端，包括：如上述实施例所述的射频功率放大器的供电电路。On the other hand, an embodiment of the present invention further provides a mobile terminal, including: the power supply circuit for a radio frequency power amplifier as described in the above embodiment.
本发明实施例提供的射频功率放大器的供电电路，通过在电源与射频功率放大器之间设置开关电路，避免失效的射频功率放大器对连接使用中的射频放大器的影响，提高移动终端的电源的稳定性，同时延长移动终端的使用时长。The power supply circuit of the radio frequency power amplifier provided by the embodiment of the present invention, by setting a switch circuit between the power supply and the radio frequency power amplifier, avoids the influence of the failed radio frequency power amplifier on the radio frequency amplifier in use, and improves the stability of the power supply of the mobile terminal , while prolonging the usage time of the mobile terminal.
附图说明Description of drawings
为了更清楚地说明本发明实施例的技术方案，下面将对本发明实施例的描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.
图1为本发明第一实施例的射频功率放大器的供电电路的示意图；Fig. 1 is the schematic diagram of the power supply circuit of the radio frequency power amplifier of the first embodiment of the present invention;
图2为本发明第二实施例的射频功率放大器的供电电路的示意图；2 is a schematic diagram of a power supply circuit of a radio frequency power amplifier according to a second embodiment of the present invention;
图3为本发明第三实施例的射频功率放大器的供电电路的示意图。FIG. 3 is a schematic diagram of a power supply circuit of a radio frequency power amplifier according to a third embodiment of the present invention.
具体实施方式detailed description
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
第一实施例first embodiment
如图1所示，为本发明第一实施例提供的射频功率放大器的供电电路，包括：电源1、多个射频功率放大器2、第二开关电路3以及天线4。As shown in FIG. 1 , the power supply circuit for a radio frequency power amplifier provided in the first embodiment of the present invention includes: a power supply 1 , a plurality of radio frequency power amplifiers 2 , a second switch circuit 3 and an antenna 4 .
这里，电源1包括：移动终端的电池电源或开关电源。Here, the power supply 1 includes: a battery power supply or a switching power supply of the mobile terminal.
需要说明的是，多个射频功率放大器所放大的射频信号的频段不同。也就是说，每次移动终端通过检测所处的周围网络环境确定的使用频段一般是不同的。It should be noted that the frequency bands of the radio frequency signals amplified by the multiple radio frequency power amplifiers are different. That is to say, the used frequency band determined by the mobile terminal by detecting the surrounding network environment is generally different each time.
其中，多个射频功率放大器2与电源1之间设置有第一开关电路5。Wherein, a first switch circuit 5 is arranged between the plurality of radio frequency power amplifiers 2 and the power supply 1 .
这里，第一开关电路5连接于电源1与多个射频功率放大器2之间。多个射频功率放大器2中的至少一个通过该第一开关电路5与电源1电连接。Here, the first switch circuit 5 is connected between the power supply 1 and the plurality of radio frequency power amplifiers 2 . At least one of the multiple radio frequency power amplifiers 2 is electrically connected to the power supply 1 through the first switch circuit 5 .
第二开关电路3连接于多个射频功率放大器2与天线4之间。多个射频功率放大器2中的至少一个通过该第二开关电路3与天线4电连接。The second switch circuit 3 is connected between the plurality of RF power amplifiers 2 and the antenna 4 . At least one of the multiple radio frequency power amplifiers 2 is electrically connected to the antenna 4 through the second switch circuit 3 .
优选的，如图1所示，本发明实施例中第一开关电路5包括：一单刀多掷开关51，该单刀多掷开关51的动端与所述电源1连接，与动端相对应的该单刀多掷开关51的多个定端分别与多个射频功率放大器2一一对应连接。Preferably, as shown in Figure 1, the first switch circuit 5 in the embodiment of the present invention includes: a single-pole multi-throw switch 51, the moving end of the single-pole multi-throw switch 51 is connected to the power supply 1, and the corresponding Multiple fixed terminals of the single-pole multiple-throw switch 51 are respectively connected to multiple radio frequency power amplifiers 2 in one-to-one correspondence.
更具体的，与动端相对应的该单刀多掷开关51的多个定端分别与多个射频功率放大器2的电源管脚一一对应连接。More specifically, the fixed ends of the SPMT switch 51 corresponding to the moving ends are respectively connected to the power supply pins of the plurality of radio frequency power amplifiers 2 in one-to-one correspondence.
需要说明的是，该单刀多掷开关51的动端也就是所谓的“刀”，可控制多个射频功率放大器2中的具体哪一个射频功率放大器与电源1电连接。It should be noted that the moving end of the single-pole multi-throw switch 51 is the so-called “knife”, which can control which radio frequency power amplifier among the plurality of radio frequency power amplifiers 2 is electrically connected to the power source 1 .
这里，移动终端可根据移动终端的使用频段，控制单刀多掷开关51的动端选择闭合至与移动终端的使用频段对应的射频功率放大器2的电源管脚，此时，第二开关电路3对应连接至该射频功率放大器2的输出端。Here, the mobile terminal can control the moving end of the single-pole multi-throw switch 51 to selectively close to the power supply pin of the RF power amplifier 2 corresponding to the frequency band used by the mobile terminal according to the frequency band used by the mobile terminal. At this time, the second switch circuit 3 corresponds to Connect to the output terminal of the RF power amplifier 2.
本发明实施例提供的射频功率放大器的供电电路，通过在电源与射频功率放大器之间设置开关电路，避免失效的射频功率放大器对连接使用中的射频放大器的影响，提高移动终端的电源的稳定性，同时延长移动终端的使用时长。The power supply circuit of the radio frequency power amplifier provided by the embodiment of the present invention, by setting a switch circuit between the power supply and the radio frequency power amplifier, avoids the influence of the failed radio frequency power amplifier on the radio frequency amplifier in use, and improves the stability of the power supply of the mobile terminal , while prolonging the usage time of the mobile terminal.
第二实施例second embodiment
如图2所示，为本发明第二实施例提供的射频功率放大器的供电电路，包括：电源1、多个射频功率放大器2、第二开关电路3以及天线4。As shown in FIG. 2 , the power supply circuit for a radio frequency power amplifier provided in the second embodiment of the present invention includes: a power supply 1 , a plurality of radio frequency power amplifiers 2 , a second switch circuit 3 and an antenna 4 .
这里，电源1包括：移动终端的电池电源或开关电源。Here, the power supply 1 includes: a battery power supply or a switching power supply of the mobile terminal.
需要说明的是，多个射频功率放大器所放大的射频信号的频段不同。也就是说，每次移动终端通过检测所处的周围网络环境确定的使用频段一般是不同的。It should be noted that the frequency bands of the radio frequency signals amplified by the multiple radio frequency power amplifiers are different. That is to say, the used frequency band determined by the mobile terminal by detecting the surrounding network environment is generally different each time.
其中，多个射频功率放大器2与电源1之间设置有第一开关电路5。Wherein, a first switch circuit 5 is arranged between the plurality of radio frequency power amplifiers 2 and the power supply 1 .
优先的，本发明实施例中第一开关电路5包括多个单路开关52，多个单路开关52的一端分别与电源1连接，多个单路开关52的另一端分别与多个射频功率放大器2一一对应连接。Preferably, in the embodiment of the present invention, the first switch circuit 5 includes a plurality of single-way switches 52, one end of the plurality of single-way switches 52 is respectively connected to the power supply 1, and the other end of the plurality of single-way switches 52 is respectively connected to a plurality of radio frequency power Amplifiers 2 are connected in one-to-one correspondence.
更具体的，多个单路开关52的另一端分别与多个射频功率放大器2的电源管脚一一对应连接。More specifically, the other ends of the multiple one-way switches 52 are respectively connected to the power supply pins of the multiple radio frequency power amplifiers 2 in a one-to-one correspondence.
需要说明的是，移动终端可根据移动终端的使用频段，控制多个单路开关52中的一个单路开关闭合，这里闭合的电路开关与移动终端的使用频段对应的射频功率放大器2连接。It should be noted that the mobile terminal can control one of the multiple one-way switches 52 to close according to the frequency band used by the mobile terminal, where the closed circuit switch is connected to the RF power amplifier 2 corresponding to the frequency band used by the mobile terminal.
当然，移动终端可根据移动终端的使用频段，控制多个单路开关52中的两个或两个以上的单路开关闭合。此时，需要说明的是，当多个单路开关52中的两个或两个以上的单路开关闭合时，可在与之对应的射频功率放大器2与第二开关电路3之间设置合路器，第二开关电路3对应连接至合路器的输出端，移动终端的射频信号经过合路器的输出端通过天线4发射出去；也可对应设置多根天线，通过多根天线将经多个单路开关52中的两个或两个以上的单路开关闭合时与之对应的射频功率放大器2放大后的射频信号发射出去。Of course, the mobile terminal can control two or more of the multiple one-way switches 52 to close according to the frequency band used by the mobile terminal. At this point, it should be noted that, when two or more of the multiple single-way switches 52 are closed, a switching circuit can be set between the corresponding radio frequency power amplifier 2 and the second switch circuit 3. The second switch circuit 3 is correspondingly connected to the output end of the combiner, and the radio frequency signal of the mobile terminal is transmitted through the antenna 4 through the output end of the combiner; multiple antennas can also be set correspondingly, through which the radio frequency signal will be transmitted through the antenna 4 When two or more one-way switches among the plurality of one-way switches 52 are closed, the corresponding radio frequency signal amplified by the radio frequency power amplifier 2 is transmitted out.
本发明实施例提供的射频功率放大器的供电电路，通过在电源与射频功率放大器之间设置多个单路开关，可灵活选择射频功率放大器，避免失效的射频功率放大器对连接使用中的射频放大器的影响，提高移动终端的电源的稳定性，同时延长移动终端的使用时长。The power supply circuit of the radio frequency power amplifier provided by the embodiment of the present invention can flexibly select the radio frequency power amplifier by arranging a plurality of single-way switches between the power supply and the radio frequency power amplifier, so as to avoid the failure of the radio frequency power amplifier to be connected to the radio frequency amplifier in use. influence, improve the stability of the power supply of the mobile terminal, and prolong the service life of the mobile terminal at the same time.
第三实施例third embodiment
如图3所示，为本发明第三实施例提供的射频功率放大器的供电电路，包括：电源1、多个射频功率放大器2、第二开关电路3以及天线4。As shown in FIG. 3 , the power supply circuit for a radio frequency power amplifier provided by the third embodiment of the present invention includes: a power supply 1 , a plurality of radio frequency power amplifiers 2 , a second switch circuit 3 and an antenna 4 .
需要说明的是，多个射频功率放大器所放大的射频信号的频段不同。也就是说，每次移动终端通过检测所处的周围网络环境确定的使用频段一般是不同的。It should be noted that the frequency bands of the radio frequency signals amplified by the multiple radio frequency power amplifiers are different. That is to say, the used frequency band determined by the mobile terminal by detecting the surrounding network environment is generally different each time.
其中，多个射频功率放大器2与电源1之间设置有第一开关电路5。Wherein, a first switch circuit 5 is arranged between the plurality of radio frequency power amplifiers 2 and the power supply 1 .
优先的，本发明实施例中第一开关电路5包括多个单路开关52，多个单路开关52的一端分别与电源1连接，多个单路开关52的另一端分别与多个射频功率放大器2中的第一数量的射频功率放大器一一对应连接；Preferably, in the embodiment of the present invention, the first switch circuit 5 includes a plurality of single-way switches 52, one end of the plurality of single-way switches 52 is respectively connected to the power supply 1, and the other end of the plurality of single-way switches 52 is respectively connected to a plurality of radio frequency power The radio frequency power amplifiers of the first quantity in the amplifier 2 are connected in one-to-one correspondence;
需要说明的是，多个单路开关52的另一端分别与多个射频功率放大器2中的第一数量的射频功率放大器一一对应连接，也就是说，并非所有的射频功率放大器2与电源1之间设置有单路开关52。It should be noted that the other ends of the plurality of one-way switches 52 are respectively connected to the first number of radio frequency power amplifiers in the plurality of radio frequency power amplifiers 2 in one-to-one correspondence, that is to say, not all radio frequency power amplifiers 2 are connected to the power supply 1 A one-way switch 52 is arranged between them.
这里，第一数量小于本发明实施例的射频功率放大器2的数量。Here, the first number is smaller than the number of radio frequency power amplifiers 2 in the embodiment of the present invention.
多个射频功率放大器2中除第一数量的射频功率放大器之外的剩余数量的射频功率放大器与电源1电连接。Among the plurality of radio frequency power amplifiers 2 , the remaining radio frequency power amplifiers except the first radio frequency power amplifiers are electrically connected to the power supply 1 .
需要说明的是，与多个单路开关52连接的第一数量的射频功率放大器的失效概率大于预设失效概率。It should be noted that the failure probability of the first number of radio frequency power amplifiers connected to the plurality of one-way switches 52 is greater than the preset failure probability.
多个射频功率放大器2中除第一数量的射频功率放大器之外的剩余数量的射频功率放大器的失效概率小于预设失效概率。The failure probability of the remaining number of radio frequency power amplifiers in the plurality of radio frequency power amplifiers 2 except the first number of radio frequency power amplifiers is less than a preset failure probability.
这里，预设失效概率为预先统计的设置于移动终端上的射频功率放大器的历史失效概率。Here, the preset failure probability is the historical failure probability of the radio frequency power amplifier set on the mobile terminal that is counted in advance.
本发明实施例提供的射频功率放大器的供电电路，通过在电源与多个射频功率放大器之间部分设置单路开关，节约成本且可灵活选择射频功率放大器，避免失效的射频功率放大器对连接使用中的射频放大器的影响，提高移动终端的电源的稳定性，同时延长移动终端的使用时长。The power supply circuit of the radio frequency power amplifier provided by the embodiment of the present invention, by partially setting a single switch between the power supply and a plurality of radio frequency power amplifiers, saves costs and can flexibly select the radio frequency power amplifier, and avoids the failure of the radio frequency power amplifier to be connected during use. The influence of the radio frequency amplifier improves the stability of the power supply of the mobile terminal and prolongs the service life of the mobile terminal at the same time.
本发明实施例还提供一种移动终端，包括如上述实施例所述的射频功率放大器的供电电路。The embodiment of the present invention also provides a mobile terminal, including the power supply circuit of the radio frequency power amplifier as described in the above embodiment.
这里，该移动终端为为手机、平板电脑、个人数字助理、车载电脑、音乐播放器、手提电脑或导航仪。Here, the mobile terminal is a mobile phone, a tablet computer, a personal digital assistant, a vehicle computer, a music player, a laptop computer or a navigator.
还需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者终端设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者终端设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者终端设备中还存在另外的相同要素。It should also be noted that in this article, relational terms such as first and second etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations Any such actual relationship or order exists between. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or terminal equipment comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements identified, or also include elements inherent in such a process, method, article, or end-equipment. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article or terminal device comprising the element.
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above description is a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.
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