CN108282004A - A kind of power circuit of phone charger - Google Patents
A kind of power circuit of phone charger Download PDFInfo
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- CN108282004A CN108282004A CN201810112267.8A CN201810112267A CN108282004A CN 108282004 A CN108282004 A CN 108282004A CN 201810112267 A CN201810112267 A CN 201810112267A CN 108282004 A CN108282004 A CN 108282004A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Details of circuit arrangements for charging or discharging batteries or supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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Abstract
本发明提供一种手机充电器的电源电路，包括电阻R1、R2、R3、R4、R5、R6、R7、R8，电容C1、C2、C3，二极管D1、D2，稳压管ZD1、变压器T1、电感L1、晶体管VT1、MOS管Q1、三端稳压源U1、光耦U2。本发明电源电路结构简单，成本低，不需振荡电路，无直通现象；工作在临界工作状态，采取自激振荡工作方式来实现峰值电流控制；电路元件全部由分立式元件构成，抗干扰能力强，工作稳定可靠，电压升降范围宽；变频控制可以获得高效和可靠的工作。
The present invention provides a power supply circuit of a mobile phone charger, including resistors R1, R2, R3, R4, R5, R6, R7, R8, capacitors C1, C2, C3, diodes D1, D2, regulator tube ZD1, transformer T1, Inductor L1, transistor VT1, MOS transistor Q1, three-terminal voltage regulator U1, optocoupler U2. The power supply circuit of the present invention is simple in structure, low in cost, does not need an oscillating circuit, and has no through phenomenon; works in a critical working state, and adopts a self-excited oscillation working mode to realize peak current control; all circuit components are composed of discrete components, and the anti-interference ability Strong, stable and reliable work, wide range of voltage rise and fall; frequency conversion control can obtain efficient and reliable work.
Description
技术领域technical field
本发明涉及电源电路技术领域，具体涉及一种手机充电器的电源电路。The invention relates to the technical field of power circuits, in particular to a power circuit of a mobile phone charger.
背景技术Background technique
手机充电器又称为移动电源，是由一个稳定电源加上必要的恒流、限压、限时等控制电路构成，主要是为蓄电装置提供能量的设备，在生活领域被广泛用于手机、相机、数码等等常见电器。Mobile phone charger, also known as mobile power supply, is composed of a stable power supply plus necessary constant current, voltage limiting, time-limiting and other control circuits. It is mainly a device that provides energy for power storage devices. It is widely used in mobile phones, Cameras, digital and other common electrical appliances.
现有的手机充电器电源一般采用PWM控制，不仅电路结构复杂，而且成本较高，功率管的开通关断需要使用专用集成芯片的PWM控制，容易出现直通现象，电路工作在断续工作状态抗干扰能力差，电压升降范围较窄。The existing mobile phone charger power supply generally adopts PWM control, not only the circuit structure is complex, but also the cost is high, the power tube needs to be turned on and off using the PWM control of the dedicated integrated chip, which is prone to direct phenomenon, and the circuit works in the intermittent working state against The interference ability is poor, and the range of voltage rise and fall is narrow.
发明内容Contents of the invention
(一)解决的技术问题(1) Solved technical problems
本发明针对上述手机充电器电源的缺陷问题，提供了一种手机充电器的电源电路，电源电路采用自激振荡式电路，具有结构简单、成本低，采用少数分离元件就可以得到需专用芯片才能实现的电压输出性能，通过变频控制可以获得高效和可靠的工作。The present invention aims at the defects of the mobile phone charger power supply mentioned above, and provides a power supply circuit of a mobile phone charger. Realized voltage output performance, efficient and reliable work can be obtained through frequency conversion control.
(二)技术方案(2) Technical solution
为实现以上目的，本发明通过以下技术方案予以实现：To achieve the above object, the present invention is achieved through the following technical solutions:
一种手机充电器的电源电路，包括电阻R1、R2、R3、R4、R5、R6、R7、R8，电容C1、C2、C3，二极管D1、D2，稳压管ZD1、变压器T1、电感L1、晶体管VT1、MOS管Q1、三端稳压源U1、光耦U2；输入电压Ui与电阻R1一端、变压器T1原边绕组Np一端相连，电阻R1另一端与稳压管ZD1阴极、MOS管Q1栅极、晶体管VT1集电极相连，稳压管ZD1阳极接地，MOS管Q1漏极与变压器原边绕组Np另一端相连，MOS管Q1源极分别与电阻R2、R3一端相连，电阻R2另一端与晶体管VT1基极相连，晶体管VT1发射极接地，电阻R3另一端接地；变压器副边绕组Ns一端接地，变压器副边绕组Ns另一端与二极管D1阳极、电阻R4、电阻R5一端相连，二极管D1阴极与电容C1、电感L1一端相连，电容C1另一端接地，电感L1另一端与电容C2一端相连，电容C2另一端接地，电容C2两端电压为输出电压Vo；电阻R4另一端与电阻R7一端、光耦U2的1脚相连，电阻R7另一端与光耦U2的2脚、三端稳压源U1的3脚相连，电阻R5另一端与三端稳压源U1的1脚、电阻R6一端相连，电阻R6另一端与三端稳压源U1的2脚相连并接地，光耦U2的3脚与晶体管VT1的基极相连，光耦U2的4脚与电阻R8、电容C3一端相连，电容C3另一端接地，电阻R8另一端与二极管D2阴极相连，二极管D2阳极与变压器T1辅助绕组Nf一端相连，变压器T1辅助绕组Nf另一端接地。A power supply circuit of a mobile phone charger, including resistors R1, R2, R3, R4, R5, R6, R7, R8, capacitors C1, C2, C3, diodes D1, D2, voltage regulator tube ZD1, transformer T1, inductor L1, Transistor VT1, MOS tube Q1, three-terminal voltage regulator U1, optocoupler U2; the input voltage Ui is connected to one end of resistor R1 and one end of transformer T1 primary winding Np, and the other end of resistor R1 is connected to the cathode of regulator ZD1 and the gate of MOS tube Q1 Pole and collector of transistor VT1 are connected, the anode of regulator tube ZD1 is grounded, the drain of MOS tube Q1 is connected to the other end of transformer primary winding Np, the source of MOS tube Q1 is connected to one end of resistors R2 and R3 respectively, and the other end of resistor R2 is connected to transistor The base of VT1 is connected, the emitter of transistor VT1 is grounded, and the other end of resistor R3 is grounded; one end of the secondary winding Ns of the transformer is grounded, the other end of the secondary winding Ns of the transformer is connected to the anode of diode D1, resistor R4, and one end of resistor R5, and the cathode of diode D1 is connected to the capacitor C1, one end of inductor L1 is connected, the other end of capacitor C1 is grounded, the other end of inductor L1 is connected to one end of capacitor C2, the other end of capacitor C2 is grounded, the voltage across capacitor C2 is the output voltage Vo; the other end of resistor R4 is connected to one end of resistor R7, and the optocoupler The other end of resistor R7 is connected to pin 2 of optocoupler U2 and pin 3 of three-terminal voltage regulator U1, the other end of resistor R5 is connected to pin 1 of three-terminal voltage regulator U1 and one end of resistor R6. The other end of R6 is connected to pin 2 of the three-terminal voltage regulator U1 and grounded, pin 3 of optocoupler U2 is connected to the base of transistor VT1, pin 4 of optocoupler U2 is connected to resistor R8 and one end of capacitor C3, and the other end of capacitor C3 The other end of the resistor R8 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to one end of the auxiliary winding Nf of the transformer T1, and the other end of the auxiliary winding Nf of the transformer T1 is grounded.
根据本发明的一实施例，所述三端稳压源为TL431。According to an embodiment of the present invention, the three-terminal voltage regulator is TL431.
根据本发明的一实施例，所述光耦U2为光耦PS2561。According to an embodiment of the present invention, the optocoupler U2 is an optocoupler PS2561.
根据本发明的一实施例，所述晶体管VT1为NPN三极管。According to an embodiment of the present invention, the transistor VT1 is an NPN transistor.
根据本发明的一实施例，所述NPN三极管为9013。According to an embodiment of the present invention, the NPN transistor is 9013.
根据本发明的一实施例，所述电阻R2两端并联有电容C7。According to an embodiment of the present invention, a capacitor C7 is connected in parallel with both ends of the resistor R2.
根据本发明的一实施例，所述变压器T1原边绕组Np一端与电阻R9、电容C4一端相连，电阻R9、电容C4另一端分别与二极管D3阴极相连，二极管D3阳极与变压器T1原边绕组Np另一端相连。According to an embodiment of the present invention, one end of the primary winding Np of the transformer T1 is connected to one end of the resistor R9 and the capacitor C4, the other ends of the resistor R9 and the capacitor C4 are respectively connected to the cathode of the diode D3, and the anode of the diode D3 is connected to the primary winding Np of the transformer T1. The other end is connected.
根据本发明的一实施例，所述二极管D2的阳极与稳压管ZD2阴极相连，稳压管ZD2阳极与电阻R12一端相连，电阻R12另一端与晶体管VT1基极相连。According to an embodiment of the present invention, the anode of the diode D2 is connected to the cathode of the voltage regulator transistor ZD2, the anode of the voltage regulator transistor ZD2 is connected to one end of the resistor R12, and the other end of the resistor R12 is connected to the base of the transistor VT1.
根据本发明的一实施例，所述二极管D2阳极与电阻R10一端相连，电阻R10另一端与电容C5一端相连，电容C5另一端与MOS管Q1栅极相连。According to an embodiment of the present invention, the anode of the diode D2 is connected to one end of the resistor R10, the other end of the resistor R10 is connected to one end of the capacitor C5, and the other end of the capacitor C5 is connected to the gate of the MOS transistor Q1.
根据本发明的一实施例，有电阻R11与电容C6串联后并联在三端稳压源U1的1脚与3脚之间。According to an embodiment of the present invention, the resistor R11 and the capacitor C6 are connected in parallel between pin 1 and pin 3 of the three-terminal voltage regulator U1 in series.
(三)有益效果(3) Beneficial effects
本发明的有益效果：一种手机充电器的电源电路，结构简单，成本低，不需振荡电路，无直通现象；工作在临界工作状态，采取自激振荡工作方式来实现峰值电流控制；电路元件全部由分立式元件构成，抗干扰能力强，工作稳定可靠，电压升降范围宽；变频控制可以获得高效和可靠的工作。Beneficial effects of the present invention: a power supply circuit of a mobile phone charger has simple structure, low cost, does not need an oscillating circuit, and has no through phenomenon; works in a critical working state, adopts a self-excited oscillation working mode to realize peak current control; circuit components All are composed of discrete components, with strong anti-interference ability, stable and reliable operation, and wide range of voltage rise and fall; frequency conversion control can obtain efficient and reliable work.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术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 in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.
图1为本发明电源电路原理图。Fig. 1 is a schematic diagram of the power supply circuit of the present invention.
附图标记说明：Explanation of reference signs:
电阻R1、R2、R3、R4、R5、R6、R7、R8、R9、R10、R11、R12，电容C1、C2、C3、C4、C5、C6、C7，二极管D1、D2、D3，稳压管ZD1、ZD2，变压器T1、电感L1、晶体管VT1、MOS管Q1、三端稳压源U1、光耦U2。Resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, capacitors C1, C2, C3, C4, C5, C6, C7, diodes D1, D2, D3, regulator tubes ZD1, ZD2, transformer T1, inductor L1, transistor VT1, MOS tube Q1, three-terminal voltage regulator U1, optocoupler U2.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚，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。In order to make the purpose, 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 in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.
结合图1，一种手机充电器的电源电路，包括电阻R1、R2、R3、R4、R5、R6、R7、R8，电容C1、C2、C3，二极管D1、D2，稳压管ZD1、变压器T1、电感L1、晶体管VT1、MOS管Q1、三端稳压源U1、光耦U2。输入电压Ui与电阻R1一端、变压器T1原边绕组Np一端相连，电阻R1另一端与稳压管ZD1阴极、MOS管Q1栅极、晶体管VT1集电极相连，稳压管ZD1阳极接地，MOS管Q1漏极与变压器原边绕组Np另一端相连，MOS管Q1源极分别与电阻R2、R3一端相连，电阻R2另一端与晶体管VT1基极相连，晶体管VT1发射极接地，电阻R3另一端接地；变压器副边绕组Ns一端接地，变压器副边绕组Ns另一端与二极管D1阳极、电阻R4、电阻R5一端相连，二极管D1阴极与电容C1、电感L1一端相连，电容C1另一端接地，电感L1另一端与电容C2一端相连，电容C2另一端接地，电容C2两端电压为输出电压Vo；电阻R4另一端与电阻R7一端、光耦U2的1脚相连，电阻R7另一端与光耦U2的2脚、三端稳压源U1的3脚相连，电阻R5另一端与三端稳压源U1的1脚、电阻R6一端相连，电阻R6另一端与三端稳压源U1的2脚相连并接地，光耦U2的3脚与晶体管VT1的基极相连，光耦U2的4脚与电阻R8、电容C3一端相连，电容C3另一端接地，电阻R8另一端与二极管D2阴极相连，二极管D2阳极与变压器T1辅助绕组Nf一端相连，变压器T1辅助绕组Nf另一端接地。Combined with Figure 1, a power supply circuit of a mobile phone charger, including resistors R1, R2, R3, R4, R5, R6, R7, R8, capacitors C1, C2, C3, diodes D1, D2, voltage regulator tube ZD1, transformer T1 , inductor L1, transistor VT1, MOS tube Q1, three-terminal voltage regulator U1, optocoupler U2. The input voltage Ui is connected to one end of the resistor R1 and one end of the primary winding Np of the transformer T1, the other end of the resistor R1 is connected to the cathode of the voltage regulator tube ZD1, the gate of the MOS tube Q1, and the collector of the transistor VT1, the anode of the voltage regulator tube ZD1 is grounded, and the MOS tube Q1 The drain is connected to the other end of the primary winding Np of the transformer, the source of the MOS tube Q1 is connected to one end of the resistors R2 and R3 respectively, the other end of the resistor R2 is connected to the base of the transistor VT1, the emitter of the transistor VT1 is grounded, and the other end of the resistor R3 is grounded; the transformer One end of the secondary winding Ns is grounded, the other end of the secondary winding Ns of the transformer is connected to the anode of the diode D1, one end of the resistor R4, and one end of the resistor R5, the cathode of the diode D1 is connected to one end of the capacitor C1 and the inductor L1, the other end of the capacitor C1 is grounded, and the other end of the inductor L1 is connected to One end of capacitor C2 is connected, the other end of capacitor C2 is grounded, and the voltage across capacitor C2 is the output voltage Vo; the other end of resistor R4 is connected to one end of resistor R7 and pin 1 of optocoupler U2, and the other end of resistor R7 is connected to pin 2 of optocoupler U2, The 3-pin of the three-terminal voltage regulator U1 is connected, the other end of the resistor R5 is connected to the 1-pin of the three-terminal voltage regulator U1, and one end of the resistor R6 is connected, and the other end of the resistor R6 is connected to the 2-pin of the three-terminal voltage regulator U1 and grounded. Pin 3 of the coupler U2 is connected to the base of the transistor VT1, pin 4 of the optocoupler U2 is connected to the resistor R8 and one end of the capacitor C3, the other end of the capacitor C3 is grounded, the other end of the resistor R8 is connected to the cathode of the diode D2, and the anode of the diode D2 is connected to the transformer T1 One end of the auxiliary winding Nf is connected, and the other end of the auxiliary winding Nf of the transformer T1 is grounded.
三端稳压源为TL431。光耦U2为光耦PS2561。晶体管VT1为NPN三极管，NPN三极管为9013。The three-terminal voltage regulator is TL431. Optocoupler U2 is optocoupler PS2561. The transistor VT1 is an NPN transistor, and the NPN transistor is 9013.
为了加速晶体管VT1的开通和MOS管Q1关断，在电阻R2两端并联有电容C7，加速电容C7使得电阻R2短路，加快晶体管VT1的开通和MOS管Q1关断，从而提高电源的稳定性和可靠性。In order to accelerate the turn-on of the transistor VT1 and the turn-off of the MOS transistor Q1, a capacitor C7 is connected in parallel at both ends of the resistor R2. The acceleration capacitor C7 short-circuits the resistor R2 to speed up the turn-on of the transistor VT1 and the turn-off of the MOS transistor Q1, thereby improving the stability of the power supply and reliability.
为了使MOS管Q1关断后，变压器T1原边绕组Np上的储存的能量快速释放掉，增加了放电回路。变压器T1原边绕组Np一端与电阻R9、电容C4一端相连，电阻R9、电容C4另一端分别与二极管D3阴极相连，二极管D3阳极与变压器T1原边绕组Np另一端相连。In order to quickly release the energy stored in the primary winding Np of the transformer T1 after the MOS transistor Q1 is turned off, a discharge circuit is added. One end of the primary winding Np of the transformer T1 is connected to one end of the resistor R9 and one end of the capacitor C4, the other ends of the resistor R9 and the capacitor C4 are respectively connected to the cathode of the diode D3, and the anode of the diode D3 is connected to the other end of the primary winding Np of the transformer T1.
为了使加快反馈顺利实现，MOS管Q1的栅极能够提供可靠的驱动电压。二极管D2的阳极与稳压管ZD2阴极相连，稳压管ZD2阳极与电阻R12一端相连，电阻R12另一端与晶体管VT1基极相连；二极管D2阳极与电阻R10一端相连，电阻R10另一端与电容C5一端相连，电容C5另一端与MOS管Q1栅极相连。In order to realize the fast feedback smoothly, the gate of the MOS transistor Q1 can provide a reliable driving voltage. The anode of diode D2 is connected to the cathode of Zener tube ZD2, the anode of Zener tube ZD2 is connected to one end of resistor R12, the other end of resistor R12 is connected to the base of transistor VT1; the anode of diode D2 is connected to one end of resistor R10, and the other end of resistor R10 is connected to capacitor C5 One end is connected, and the other end of the capacitor C5 is connected to the gate of the MOS transistor Q1.
为了使电源电路的反馈回路工作在双极点，增加了PI调节，有电阻R11与电容C6串联后并联在三端稳压源U1的1脚与3脚之间。In order to make the feedback loop of the power supply circuit work at a double pole, a PI adjustment is added, and a resistor R11 and a capacitor C6 are connected in series and connected in parallel between pin 1 and pin 3 of the three-terminal voltage regulator U1.
本发明手机充电器的电源电路，电路结构简单，只需要少数分离元件就可以得到需专用芯片才能实现的电压输出性能，通过良好的设计就可以获得高效和可靠的工作。许多与驱动有关的困难(驱动波形、变压器饱和等)在本发明电源电路中得到很好的解决。由于电源总是工作于完全能量传递模式，副边整流二极管零电流导通，反向恢复电流和损耗很小，产生的振铃相对于不完全能量传递模式要小很多，因此输出的高频杂音也要小很多。The power supply circuit of the mobile phone charger of the present invention has a simple circuit structure, only needs a small number of separate components to obtain the voltage output performance that can only be realized by a dedicated chip, and can obtain high-efficiency and reliable work through good design. Many difficulties associated with driving (driving waveforms, transformer saturation, etc.) are well resolved in the power supply circuit of the present invention. Since the power supply always works in the complete energy transfer mode, the secondary rectifier diode conducts with zero current, the reverse recovery current and loss are very small, and the ringing generated is much smaller than that in the incomplete energy transfer mode, so the output high-frequency noise Also much smaller.
本发明电源电路是一种PFM变频控制电源，其稳压控制过程不是像PWM方式，而是有稳压管组成电平开关控制开关管的通/断。普通PWM稳压过程无论自激式还是它激式，开关管的通/断总是按其工作频率周期性地进行，PWM系统只是控制每个周期脉冲的宽度。为了使稳压过程有平滑的特性，PWM系统工作在线性区脉宽调制管既不能饱和也不能截止，因此不会因其截止而使某一周期脉冲宽度为零，也不会因其截止而使某一周期脉冲宽度达到间歇振荡器时间常数电路设定的最大宽度，一般仅为其50％。The power supply circuit of the present invention is a PFM frequency conversion control power supply. Its voltage stabilization control process is not like the PWM mode, but a level switch composed of a voltage stabilization tube to control the on/off of the switch tube. No matter self-excited or other-excited in the common PWM voltage regulation process, the on/off of the switching tube is always carried out periodically according to its operating frequency, and the PWM system only controls the width of each cycle pulse. In order to make the voltage regulation process have smooth characteristics, the PWM system works in the linear region, and the pulse width modulation tube can neither be saturated nor cut off, so the pulse width of a certain period will not be zero due to its cut-off, nor will it be affected by the cut-off. Make the pulse width of a certain cycle reach the maximum width set by the intermittent oscillator time constant circuit, generally only 50% of it.
综上所述，本发明实施例，手机充电器的电源电路，结构简单，成本低，不需振荡电路，无直通现象；工作在临界工作状态，采取自激振荡工作方式来实现峰值电流控制；电路元件全部由分立式元件构成，抗干扰能力强，工作稳定可靠，电压升降范围宽；变频控制可以获得高效和可靠的工作。In summary, in the embodiment of the present invention, the power supply circuit of the mobile phone charger has a simple structure, low cost, no need for an oscillation circuit, and no through phenomenon; it works in a critical working state, and adopts a self-excited oscillation working mode to realize peak current control; The circuit components are all composed of discrete components, with strong anti-interference ability, stable and reliable operation, wide range of voltage rise and fall; frequency conversion control can obtain efficient and reliable work.
以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be described in the foregoing embodiments Modifications are made to the recorded technical solutions, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
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