阅读说明：本技术 激光发射器驱动电路、系统及高速光通信装置 (Laser transmitter driving circuit, system and high-speed optical communication device ) 是由 张宁 张超 臧凯 于 2020-06-20 设计创作，主要内容包括：本申请提供了一种激光发射器驱动电路,应用于多个激光发射器,激光发射器驱动电路包括：选择模块、高电压产生模块、多个充放电模块及多个电容组,选择模块及高电压产生模块分别连接多个充放电模块,选择模块用于向多个充放电模块分别发送选择信号,高电压产生模块用于向多个充放电模块分别提供高电压信号；激光发射器包括第一电极；其中,单个电容组的一端与对应的激光发射器的第一电极连接,且另一端接地,充放电模块根据选择信号并通过高电压信号对电容组充电,当电容组放电时,电流经过激光发射器连接,以驱动激光发射器发射激光。激光发射器驱动电路减轻驱动激光发射器的负担。本申请还提供了一种激光发射器驱动系统及高速光通信装置。(The application provides a laser emitter drive circuit is applied to a plurality of laser emitter, and laser emitter drive circuit includes: the high-voltage generating module is used for respectively providing high-voltage signals to the plurality of charging and discharging modules; the laser transmitter comprises a first electrode; one end of each capacitor group is connected with the first electrode of the corresponding laser transmitter, the other end of each capacitor group is grounded, the charge-discharge module charges the capacitor groups according to the selection signals and through high-voltage signals, and when the capacitor groups are discharged, current is connected through the laser transmitters so as to drive the laser transmitters to emit laser. The laser emitter driving circuit reduces the burden of driving the laser emitter. The application also provides a laser transmitter driving system and a high-speed optical communication device.)

1. A laser transmitter driving circuit applied to a plurality of laser transmitters is characterized by comprising: the charge-discharge control circuit comprises a selection module, a high voltage generation module, a plurality of charge-discharge modules and a plurality of capacitor groups, wherein the selection module and the high voltage generation module are respectively connected with the plurality of charge-discharge modules, the selection module is used for respectively sending selection signals to the plurality of charge-discharge modules, and the high voltage generation module is used for respectively providing high voltage signals to the plurality of charge-discharge modules; the laser transmitter comprises a first electrode; one end of each capacitor bank is connected with the corresponding first electrode of the laser transmitter, the other end of each capacitor bank is grounded, the charge and discharge module charges the capacitor banks according to the selection signals and through the high-voltage signals, and when the capacitor banks discharge, current passes through the laser transmitters to be connected so as to drive the laser transmitters to transmit laser.

2. The laser transmitter driving circuit according to claim 1, wherein the charge-discharge module comprises: the first voltage translation circuit is connected with the selection module and used for receiving the selection signal and boosting the selection signal to obtain a boosted signal, and the inverter is connected with the first voltage translation circuit and used for receiving the boosted signal and inverting the potential of the boosted signal to obtain a counter-voltage signal.

3. The laser transmitter driving circuit according to claim 2, wherein the first switch and the second switch each comprise a gate, a source and a drain, the gate of the first switch is connected to the back-voltage signal and the gate of the second switch, the source of the first switch is connected to the high-voltage generating module for receiving the high-voltage signal, the drain of the first switch is connected to the first electrode, the source of the second switch is grounded, and the drain of the second switch is connected to the first electrode.

4. The laser transmitter driver circuit of claim 3, wherein the first switch is a P-type transistor and the second switch is an N-type transistor.

5. The laser emitter drive circuit of claim 1, further comprising: the laser emitter comprises a pulse generation module and a switch module, wherein the pulse generation module is used for generating a first pulse signal, the switch module is connected with the pulse unit to receive the first pulse signal, the switch module is also connected with the high-voltage generation module to receive the high-voltage signal, and the switch module is matched with the charge and discharge module according to the first pulse signal and the high-voltage signal to drive the laser emitter to emit laser.

6. The laser transmitter drive circuit of claim 5, wherein the switching module comprises: the second voltage translation circuit is connected with the pulse generation module and used for receiving the first pulse signal and boosting the first pulse signal to obtain a second pulse signal, and the buffer is connected with the second voltage translation circuit and used for receiving the second pulse signal and buffering the second pulse signal to obtain a third pulse signal.

7. The laser transmitter driving circuit according to claim 6, wherein the third switch and the fourth switch each comprise a gate, a source and a drain, the gate of the third switch is connected to the third pulse signal and the gate of the fourth switch, the source of the third switch is connected to the high voltage generating module for receiving the high voltage signal, the laser transmitter further comprises a second electrode, the drain of the third switch is connected to the second electrode, the source of the fourth switch is grounded, and the drain of the fourth switch is connected to the second electrode.

8. The laser transmitter driving circuit according to claim 7, wherein the second electrodes of a plurality of the laser transmitters are simultaneously connected to the drain of the third switch and the drain of the fourth switch.

9. The laser transmitter driver circuit of claim 7, wherein the third switch is a P-type transistor and the fourth switch is an N-type transistor.

10. The laser transmitter driving circuit according to claim 1, wherein the capacitor bank is constituted by one capacitor or two or more capacitors.

11. A laser transmitter drive system comprising a plurality of laser transmitters and a laser transmitter drive circuit as claimed in any one of claims 1 to 10 for driving the plurality of laser transmitters to emit laser light.

12. A high speed optical communication device, comprising the laser transmitter driving system of claim 11.

Technical Field

The present application relates to the field of optoelectronic technologies, and in particular, to a laser transmitter driving circuit, a laser transmitter driving system, and a high-speed optical communication device.

Background

Currently, optical communication systems are one of the important research directions. Laser is widely used in the technical fields of high-speed optical communication systems, laser radars and the like as one of the commonly used information carriers in optical communication systems. Due to the fact that the laser emitting power of the laser emitter is high, a driving circuit with strong driving capability is needed to drive the laser emitter to work.

Disclosure of Invention

The application discloses laser emitter drive circuit when normal drive laser emitter work, reduces laser emitter's instantaneous power for the burden of drive capability of drive circuit can alleviate.

In a first aspect, the present application provides a laser transmitter driving circuit applied to a plurality of laser transmitters, the laser transmitter driving circuit including: the charge-discharge control circuit comprises a selection module, a high voltage generation module, a plurality of charge-discharge modules and a plurality of capacitor groups, wherein the selection module and the high voltage generation module are respectively connected with the plurality of charge-discharge modules, the selection module is used for respectively sending selection signals to the plurality of charge-discharge modules, and the high voltage generation module is used for respectively providing high voltage signals to the plurality of charge-discharge modules; the laser transmitter comprises a first electrode; one end of each capacitor bank is connected with the corresponding first electrode of the laser transmitter, the other end of each capacitor bank is grounded, the charge and discharge module charges the capacitor banks according to the selection signals and through the high-voltage signals, and when the capacitor banks discharge, current passes through the laser transmitters to be connected so as to drive the laser transmitters to transmit laser.

Compared with the prior art, the charge-discharge module in the laser transmitter driving circuit can selectively drive the laser transmitter to transmit laser according to the selection signal, so that the instantaneous power of the laser transmitter to transmit laser in the same time is reduced, and the burden of the driving capability of the laser transmitter driving circuit is reduced.

In a second aspect, the present application further provides a laser emitter driving system, where the laser emitter driving system includes a plurality of laser emitters and the laser emitter driving circuit according to the first aspect, and the laser emitter driving circuit is configured to drive the plurality of laser emitters to emit laser light.

In a third aspect, the present application also provides a high-speed optical communication device comprising the laser emitter driving system according to the second aspect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any inventive exercise.

Fig. 1 is a schematic diagram of a driving circuit framework of a laser transmitter according to a first embodiment of the present disclosure.

Fig. 2 is a schematic circuit diagram of a charge-discharge module according to an embodiment of the present disclosure.

Fig. 3 is a schematic diagram of a laser transmitter according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a P-type transistor according to an embodiment of the present application.

Fig. 5 is a schematic diagram of an N-type transistor according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a driving circuit framework of a laser transmitter according to an embodiment of the present disclosure.

Fig. 7 is a circuit schematic diagram of a switch module according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a laser transmitter driving system according to an embodiment of the present disclosure.

Fig. 9 is a schematic diagram of a high-speed optical communication device according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Referring to fig. 1, fig. 1 is a schematic diagram of a laser transmitter driving circuit 1 according to a first embodiment of the present disclosure. The laser emitter driving circuit 1 is applied to a plurality of laser emitters 21, and includes: the charging and discharging circuit comprises a selection module 11, a high voltage generation module 12 and a plurality of charging and discharging modules 13. The selection module 11 and the high voltage generation module 12 are respectively connected to the plurality of charge-discharge modules 13, the selection module 11 is configured to respectively send a selection signal to the plurality of charge-discharge modules 13, and the high voltage generation module 12 is configured to respectively provide a high voltage signal to the plurality of charge-discharge modules 13. The laser transmitter 21 includes a first electrode 211 (see fig. 2 and 3); one end of the single capacitor bank 135 is connected to the corresponding first electrode 211 of the laser emitter 21, and the other end of the single capacitor bank is grounded, the charge and discharge module 13 charges the capacitor bank 135 according to the selection signal and through the high voltage signal, and when the capacitor bank 135 discharges, a current flows through the laser emitter 21 to drive the laser emitter 21 to emit laser.

It should be noted that the voltage value of the high voltage signal generated by the high voltage generation module 12 is greater than or equal to the voltage value of a power signal, and the power signal may be generated by a power device externally connected to the laser emitter driving circuit 1, or may be generated inside the laser emitter driving circuit 1.

It is understood that the high voltage signal generated by the high voltage generating module 12 is applied to the laser transmitter 21 through the charging and discharging module 13. Specifically, in this embodiment, the selection signal generated by the selection module 11 may be a high level signal or a low level signal. For example, when the selection signal is at a high level, the charging and discharging module 13 transmits the high voltage signal to the laser emitter 21 to drive the laser emitter 21 to emit laser light; when the selection signal is at a low level, the charge and discharge module 13 stops transmitting the high voltage signal to the laser emitter 21 and pulls down the voltage of the first electrode 211 to a ground voltage, and the laser emitter 21 does not emit laser light.

Optionally, in other possible embodiments, the charge and discharge module 13 may also transmit the high voltage signal to the laser transmitter 21 when the selection signal is at a low level, or the selection signal is a signal in another form. It should be understood that the form of the selection signal is not limited in the present application as long as the charging and discharging module 13 is not affected for driving the laser emitter 21 to emit laser according to the selection signal and the high voltage signal.

It can be understood that, in this embodiment, the charging and discharging module 13 can selectively drive the laser emitter 21 to emit laser according to the selection signal, so as to reduce the instantaneous power of the laser emitter 21 emitting laser at the same time, thereby reducing the burden of the driving capability of the laser emitter driving circuit 1.

In a possible embodiment, please refer to fig. 2 together, and fig. 2 is a schematic circuit diagram of a charge-discharge module according to an embodiment of the present disclosure. The charge and discharge module 13 includes: a first voltage level shifter 131, an inverter 132, a first switch 133, and a second switch 134. The first voltage translation circuit 131 is connected to the selection module 11, and configured to receive the selection signal and boost the selection signal to obtain a boosted signal. The inverter 132 is connected to the first voltage translation circuit 131, and configured to receive the boosted voltage signal and invert the potential of the boosted voltage signal to obtain a back-voltage signal.

Specifically, the first voltage translation circuit 131 may be, but is not limited to, a voltage boost circuit. In this embodiment, the selection signal is a signal of a power domain of the power signal, the first voltage level shifter circuit 131 boosts the selection signal to obtain the boosted voltage signal, and the boosted voltage signal is a signal of a power domain of the high voltage signal. The power domain refers to a voltage range, for example, the power domain of the power signal refers to 0V to the maximum voltage of the power signal, and the maximum voltage of the power signal may be 2V, 3V, 5V, etc. under different requirements. Similarly, the power domain of the high voltage signal is 0V to the maximum voltage value of the high voltage signal. The inverter 132 inverts the potential of the boosted voltage signal to obtain the back voltage signal, in other words, the inverter 132 inverts the phase of the boosted voltage signal by 180 degrees, that is, the phase difference between the back voltage signal and the boosted voltage signal is 180 degrees.

Specifically, the back voltage signal may control the first switch 133 and the second switch 134 to be turned on or off, and the high voltage signal or the ground signal may be applied to the first electrode 211 of the laser emitter 21, respectively.

Specifically, the on/off of the first switch 133 and the second switch 134 means that the second switch 134 is turned off when the first switch 133 is turned on; alternatively, when the first switch 133 is turned off, the second switch 134 is turned on.

Specifically, in the present embodiment, please refer to fig. 3, and fig. 3 is a schematic diagram of a laser transmitter according to an embodiment of the present application. As shown in fig. 3, the laser transmitter 21 includes a first electrode 211, a light emitting element 212 and a second electrode 213, and the light emitting element 212 emits laser light when driven by voltages of the first electrode 211 and the second electrode 213. When the back voltage signal is at a low potential, the first switch 133 is turned on, the second switch 134 is turned off, and the high voltage signal is applied to the first electrode 31 of the laser emitter 21 through the first switch 133; when the back voltage signal is at a high potential, the first switch 133 is turned off, the second switch 134 is turned on, and a ground signal is applied to the first electrode 211 of the laser transmitter 21 through the second switch 134.

Further, referring to fig. 2 again, the first switch 133 and the second switch 134 each include a gate g, a source s and a drain d. The gate g of the first switch 133 is connected to the back-voltage signal and the gate g of the second switch 134, the source s of the first switch 133 is connected to the high-voltage generating module 12 for receiving the high-voltage signal, and the drain d of the first switch 133 is connected to the first electrode 211. The source s of the second switch 134 is grounded, and the drain d of the second switch 134 is connected to the first electrode 211.

Specifically, in the present embodiment, the first switch 133 and the second switch 134 are transistors. The transistor is characterized in that when the gate g of the first switch 133 or the second switch 134 is loaded with a suitable voltage signal, the source s and the drain d of the first switch 133 or the second switch 134 are turned on.

Specifically, in the present embodiment, please refer to fig. 4 and fig. 5 together, wherein fig. 4 is a schematic diagram of a P-type transistor according to an embodiment of the present application; fig. 5 is a schematic diagram of an N-type transistor according to an embodiment of the present application. The first switch 133 is a P-type transistor, and the second switch 134 is an N-type transistor.

Specifically, as shown in fig. 4, the P-type transistor is formed by a gate g and an N-type semiconductor wrapping two P-type semiconductors, wherein one P-type semiconductor is a source s and the other P-type semiconductor is a drain d. The gate g is a metal electrode, and an insulating layer I is further disposed between the gate g and the source s and the drain d. As trivalent element impurities are doped in the P-type semiconductor material, most carriers in the P-type semiconductor are holes, and the holes are positively charged. When the gate g of the first switch 133 is loaded with a low potential, the two P-type semiconductors form a channel to turn on the source s and the drain d of the first switch 133.

In contrast, as shown in fig. 5, the N-type transistor is formed by a gate g and a P-type semiconductor wrapping two N-type semiconductors, wherein one N-type semiconductor is a source s and the other is a drain d. Since pentavalent element impurities are doped in the N-type semiconductor material, most carriers in the N-type semiconductor are electrons, and the electrons are negatively charged. When the gate g of the second switch 134 is applied with a high voltage, two N-type semiconductors form a channel to turn on the source s and the drain d of the first switch 133.

That is, in the present embodiment, when the back voltage signal is at a low potential, that is, when the selection signal is at a high potential, the first switch 133 is turned on, the second switch 134 is turned off, and the high voltage signal is applied to the first electrode 211 of the laser emitter 21 through the first switch 133. When the back voltage signal is at a high level, that is, when the selection signal is at a low level, the first switch 133 is turned off, the second switch 134 is turned on, and the ground signal is applied to the first electrode 211 of the laser emitter 21 through the second switch 134.

It is understood that, in other possible embodiments, the first switch 133 and the second switch 134 may also be other types of switches, as long as the high voltage signal or the ground signal is applied to the first electrode 211 of the laser transmitter 21 according to the on or off of the first switch 133 and the second switch 134, respectively, which is not limited in this application.

In one possible embodiment, please refer to fig. 6, and fig. 6 is a schematic diagram of a driving circuit framework of a laser transmitter according to an embodiment of the present disclosure. The laser transmitter driving circuit 1 further includes: pulse generation module 14, and switch module 15. The pulse generating module 14 is configured to generate a first pulse signal, the switch module 15 is connected to the pulse unit to receive the first pulse signal, and the switch module 15 is further connected to the high voltage generating module 12 to receive the high voltage signal. The switch module 15 is matched with the charge and discharge module 13 according to the first pulse signal and the high voltage signal to drive the laser emitter 21 to emit laser.

Specifically, the first pulse signal generated by the pulse generating module 14 may be a square wave, a triangular wave, a sawtooth wave, or the like. In this embodiment, when the first pulse signal is at a high potential, the switch module 15 turns on a circuit where the laser emitter 21 is located, so that the charge and discharge module 13 drives the laser emitter 21 to emit laser.

It can be understood that, by adjusting the frequency of the first pulse signal, the frequency of the switch module 15 conducting the circuit where the laser transmitter 21 is located can be adjusted, that is, the frequency of the laser transmitter 21 emitting laser can be adjusted, so as to achieve the technical effects of high-speed optical communication or laser radar.

Specifically, in a possible embodiment, please refer to fig. 7 together, and fig. 7 is a schematic circuit diagram of a switch module according to an embodiment of the present disclosure. The switch module 15 includes: a second voltage level shifter 151, a buffer 152, a third switch 153, and a fourth switch 154. The second voltage translation circuit 151 is connected to the pulse generating module 14, and is configured to receive the first pulse signal and boost the first pulse signal to obtain a second pulse signal. The buffer 152 is connected to the second voltage level shifter 151, and is configured to receive the second pulse signal and buffer the second pulse signal to obtain a third pulse signal.

Specifically, please refer to the above description for the second voltage level shifting circuit 151, which is not repeated herein. The first pulse signal is a signal of a power domain of the power signal, the second voltage level shifter circuit 151 boosts the first pulse signal to obtain the second pulse signal, and the second pulse signal is a signal of the power domain of the high voltage signal. The buffer 152 delays the output time of the third pulse signal, and functions as a buffer circuit.

Further, referring to fig. 7 again, the third switch 153 and the fourth switch 154 each include a gate g, a source s and a drain d. The gate g of the third switch 153 is connected to the third pulse signal and the gate g of the fourth switch 154. The source s of the third switch 153 is connected to the high voltage generating module 12 for receiving the high voltage signal. The laser transmitter 21 further includes a second electrode 213, a drain d of the third switch 153 is connected to the second electrode 213, a source s of the fourth switch 154 is grounded, and a drain d of the fourth switch 154 is connected to the second electrode 213.

It is understood that, in the present embodiment, the second electrodes 213 of a plurality of the laser emitters 21 are simultaneously connected to the drain d of the third switch 153 and the drain d of the fourth switch 154. That is, the switch module 15 can control whether the plurality of laser emitters 21 are turned on or not at the same time by controlling the difference of the voltage signals applied to the second electrodes 213 of the laser emitters 21.

Optionally, in other possible embodiments, the first electrodes 211 of the plurality of laser emitters 21 are simultaneously connected to the drain d of the third switch 153 and the drain d of the fourth switch 154, and the second electrodes 213 of the plurality of laser emitters 21 are connected to the plurality of charge and discharge modules 13 in a one-to-one correspondence manner.

Specifically, in the present embodiment, the third switch 153 and the fourth switch 154 are transistors. For the characteristics of the transistor, please refer to the above description, which is not repeated herein. In this embodiment, the third switch 153 is a P-type transistor, and the fourth switch 154 is an N-type transistor.

Specifically, the buffer signal may control the third switch 153 and the fourth switch 154 to be turned on or off, and the high voltage signal or the ground signal may be applied to the second electrode 213 of the laser emitter 21, respectively.

Specifically, the on/off of the third switch 153 and the fourth switch 154 means that when the third switch 153 is on, the fourth switch 154 is off; alternatively, when the third switch 153 is turned off, the fourth switch 154 is turned on.

Specifically, the characteristics of the P-type transistor and the N-type transistor are described above, and are not described herein again. In this embodiment, when the third pulse signal is at a low potential, that is, the first pulse signal is at a low potential, the first switch 133 is turned on, the second switch 134 is turned off, and the high voltage signal is applied to the second electrode 213 of the laser emitter 21 through the first switch 133. When the third pulse signal is at a high potential, that is, the first pulse signal is at a high potential, the first switch 133 is turned off, the second switch 134 is turned on, and a ground signal is applied to the second electrode 213 of the laser emitter 21 through the second switch 134.

It is understood that, in other possible embodiments, the third switch 153 and the fourth switch 154 may also be other types of switches, as long as the high voltage signal or the ground signal is applied to the second electrode 213 of the laser transmitter 21 according to the on or off of the third switch 153 and the fourth switch 154, respectively, which is not limited in this application.

In one possible embodiment, please refer to FIG. 6 again. The charge and discharge module 13 further includes a plurality of capacitor banks 135. One end of the capacitor bank 135 is connected to the first electrode 211 of the corresponding laser transmitter 21, and the other end is grounded. The charge-discharge module 13 charges the capacitor bank 135 according to the selection signal and the high voltage signal. When the switch module 15 controls the path where the laser transmitter 21 is located to be opened, the capacitor bank 135 discharges, and a current passes through the laser transmitter 21.

Specifically, the charging and discharging module 13 charges the capacitor bank 135 according to the selection signal and the high voltage signal, for example, when the selection signal is high, that is, the back voltage signal is low, the first switch 133 is turned on, and the high voltage signal is loaded to one end of the capacitor bank 135 to charge the capacitor bank 135.

Specifically, when the switch module 15 controls the path where the laser emitter 21 is located to be opened, that is, when the first pulse signal is at a high potential, that is, the third pulse signal is at a high potential, the ground signal is loaded to the other end of the capacitor bank 135 and the second electrode 213 of the laser emitter 21. The charge stored in the capacitor bank 135 flows through the laser emitter 21, so that the laser emitter 21 emits laser light.

In a possible embodiment, the capacitor bank 135 is formed by one capacitor or two capacitors or more.

Specifically, when the number of capacitors in the capacitor bank 135 is greater than or equal to two, the capacitors may be connected in series or in parallel to form the capacitor bank 135 with different capacitance values, so as to satisfy the current required for driving different laser emitters 21.

Fig. 8 is a schematic diagram of a frame of a laser transmitter driving system 2 according to an embodiment of the present disclosure, and fig. 8 is a schematic diagram of a laser transmitter driving system. The laser emitter drive system 2 includes a plurality of laser emitters 21 and the laser emitter drive circuit 1 as described above. The laser emitter driving circuit 1 is configured to drive the plurality of laser emitters 21 to emit laser light.

Specifically, the laser emitter 21 can emit laser under driving, and the laser has wide application in many fields due to the characteristics of directional light emission, high brightness, pure color, large energy and the like. In contrast, the drive circuit required to drive the laser emitter 21 is more demanding. The laser emitter driving circuit 1 selectively drives any of the plurality of laser emitters 21 to emit laser, so that the instantaneous power of the laser emitters 21 is reduced, and the burden of the driving circuit is reduced. Specifically, please refer to the above description for the laser transmitter driving circuit 1, which is not described herein again.

Fig. 9 is a schematic diagram of a high-speed optical communication device 3 according to an embodiment of the present application, and fig. 9 is a schematic diagram of a high-speed optical communication device frame. The high speed optical communication device 3 comprises a laser transmitter drive system 2 as described above.

Specifically, as shown in fig. 9, the high-speed optical communication device 3 generally further includes a receiving module 31, the laser emitted by the laser emitter 21 can be used as a carrier of communication data, and the receiving module 31 is configured to receive the laser emitted by the laser emitter 21 and convert a laser signal into a data electrical signal, so as to achieve a technical effect of high-speed optical communication.

The principle and the implementation of the present application are explained herein by applying specific examples, and the above description of the embodiments is only used to help understand the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.