阅读说明：本技术 一种晶体振荡器的温度补偿方法及系统 (Temperature compensation method and system of crystal oscillator ) 是由 李妥 岳焕慧 于 2021-10-13 设计创作，主要内容包括：本发明涉及一种晶体振荡器的温度补偿方法及系统,所述一种晶体振荡器的温度补偿方法包括：利用晶体振荡器的环境温度值获取环境温度数字输出值；根据所述环境温度数字输出值对晶体振荡器进行温度补偿,所述一种晶体振荡器的温度补偿系统包括：采集模块,用于利用晶体振荡器的环境温度值获取环境温度数字输出值；补偿模块,用于根据所述环境温度数字输出值对晶体振荡器进行温度补偿,采用一对一的方式控制温度补偿输出频率,提升了补偿精度,在实施方法中减少花销,同时显著降低了控制字变化过程中由于电容失配导致的非线性问题。(The invention relates to a temperature compensation method and a temperature compensation system for a crystal oscillator, wherein the temperature compensation method for the crystal oscillator comprises the following steps: acquiring an environment temperature digital output value by using an environment temperature value of a crystal oscillator; according to the environment temperature digital output value, temperature compensation is carried out on the crystal oscillator, and the temperature compensation system of the crystal oscillator comprises: the acquisition module is used for acquiring an environment temperature digital output value by utilizing the environment temperature value of the crystal oscillator; and the compensation module is used for carrying out temperature compensation on the crystal oscillator according to the environment temperature digital output value, controlling the temperature compensation output frequency in a one-to-one mode, improving the compensation precision, reducing the cost in the implementation method and simultaneously remarkably reducing the nonlinear problem caused by capacitance mismatch in the control word change process.)

1. A method of temperature compensation of a crystal oscillator, comprising:

acquiring an environment temperature digital output value by using an environment temperature value of a crystal oscillator;

and carrying out temperature compensation on the crystal oscillator according to the environment temperature digital output value.

2. The method of claim 1, wherein obtaining the ambient temperature digital output value using the ambient temperature value of the crystal oscillator comprises:

acquiring an environment temperature sampling value by using an environment temperature value of a crystal oscillator;

and judging the size of the environment temperature sampling value and a preset moving average operation period value, if the size is smaller than the preset moving average operation period value, using the current environment temperature sampling value as an environment temperature digital output value, and otherwise, obtaining the environment temperature digital output value based on a moving average algorithm according to the environment temperature sampling value.

3. The method of claim 2, wherein the pre-determined moving average operation period value comprises:

the calculation period value is a moving average calculation period value, the sensor resolution for obtaining the ambient temperature, the ambient temperature compensation period, and the ambient temperature change rate.

4. The method of claim 1, wherein temperature compensating the crystal oscillator based on the ambient temperature digital output value comprises:

Acquiring a temperature compensation load capacitance value based on a preset load capacitance value library according to the environment temperature digital output value;

and performing temperature compensation on the crystal oscillator by using the temperature compensation load capacitance value.

5. The method of claim 4, wherein the presetting of the load capacitance value library comprises:

obtaining a load capacitance-temperature curve by using the environment temperature digital output value and a load capacitance value corresponding to the environment temperature digital output value based on a least square method;

and obtaining load capacitance values corresponding to different environment temperature digital output values by using the environment temperature digital output values according to the load capacitance-temperature curve, and establishing a load capacitance value library.

6. The method of claim 4, wherein obtaining the temperature compensation load capacitance value based on a preset load capacitance value library according to the environment temperature digital output value comprises:

when the low-order value of the environment temperature digital output value is zero, the load capacitance storage value corresponding to the high-order value of the environment temperature digital output value is used as a temperature compensation load capacitance value;

and when the low-order value of the environment temperature digital output value is not zero, calculating the temperature compensation load capacitance value by utilizing the load capacitance storage value corresponding to the high-order value of the environment temperature digital output value and the next-stage load capacitance storage value corresponding to the high-order value of the environment temperature digital output value according to the low-order value of the environment temperature digital output value.

7. The method of claim 6, wherein the calculating of the temperature compensated load capacitance value using the load capacitance storage value corresponding to the higher value of the ambient temperature digital output value and the next-stage load capacitance storage value corresponding to the higher value of the ambient temperature digital output value according to the lower value of the ambient temperature digital output value is as follows:

wherein N is a temperature compensation value, k is a low value according to the environment temperature digital output value,high order pair for ambient temperature digital output valueThe value of the corresponding load capacitance is stored,and L is the low-order value digit of the environment temperature digital output value.

8. A temperature compensation system for a crystal oscillator, comprising:

the acquisition module is used for acquiring an environment temperature digital output value by utilizing the environment temperature value of the crystal oscillator;

and the compensation module is used for carrying out temperature compensation on the crystal oscillator according to the environment temperature digital output value.

9. The system of claim 8, wherein obtaining the ambient temperature digital output value using the ambient temperature value of the crystal oscillator comprises:

Acquiring an environment temperature sampling value by using an environment temperature value of a crystal oscillator;

and judging the size of the environment temperature sampling value and a preset moving average operation period value, if the size is smaller than the preset moving average operation period value, using the current environment temperature sampling value as an environment temperature digital output value, and otherwise, obtaining the environment temperature digital output value based on a moving average algorithm according to the environment temperature sampling value.

10. The system of claim 9, wherein the predetermined moving average calculation period value comprises:

the calculation period value is a moving average calculation period value, the sensor resolution for obtaining the ambient temperature, the ambient temperature compensation period, and the ambient temperature change rate.

Technical Field

The invention relates to the technical field of integrated circuits, in particular to a temperature compensation method and system of a crystal oscillator.

Background

The time-frequency product is widely applied to time synchronization systems of various industries, and covers terminal equipment systems such as communication systems, power systems, broadcast televisions, Internet of things and the like. The quartz crystal is limited by the material characteristics of the quartz crystal, the oscillation frequency can change along with the ambient temperature, the temperature drift of the quartz crystal can reach dozens or even hundreds of ppm generally within the temperature range of-45-90 ℃, the requirements of a communication system and electronic equipment in the 5G intelligent science and technology era on high precision and stable clock output are difficult to meet, the adjustment of the output frequency of the crystal oscillator can be realized by adjusting the load capacitance of the crystal oscillator, but due to the difference of the crystal characteristics, a temperature compensation scheme needs to be made for each crystal oscillator to realize high-precision frequency output. The off-chip temperature compensation scheme implemented using discrete devices requires significant hardware overhead and is limited by the difficulty in achieving high-precision frequency output with device precision.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a temperature compensation method of a crystal oscillator, which comprises the following steps:

acquiring an environment temperature digital output value by using an environment temperature value of a crystal oscillator;

and carrying out temperature compensation on the crystal oscillator according to the environment temperature digital output value.

Preferably, the obtaining the environment temperature digital output value by using the environment temperature value of the crystal oscillator includes:

acquiring an environment temperature sampling value by using an environment temperature value of a crystal oscillator;

and judging the size of the environment temperature sampling value and a preset moving average operation period value, if the size is smaller than the preset moving average operation period value, using the current environment temperature sampling value as an environment temperature digital output value, and otherwise, obtaining the environment temperature digital output value based on a moving average algorithm according to the environment temperature sampling value.

Further, the value of the preset moving average operation period value includes:

wherein M is the moving average operation period value,in order to obtain the sensor resolution of the ambient temperature,in order to compensate for the period of ambient temperature,is the ambient temperature rate of change.

Preferably, the temperature compensation of the crystal oscillator according to the environment temperature digital output value includes:

Acquiring a temperature compensation load capacitance value based on a preset load capacitance value library according to the environment temperature digital output value;

and performing temperature compensation on the crystal oscillator by using the temperature compensation load capacitance value.

Further, the presetting of the load capacitance value library comprises:

obtaining a load capacitance-temperature curve by using the environment temperature digital output value and a load capacitance value corresponding to the environment temperature digital output value based on a least square method;

and obtaining load capacitance values corresponding to different environment temperature digital output values by using the environment temperature digital output values according to the load capacitance-temperature curve, and establishing a load capacitance value library.

Further, the obtaining of the temperature compensation load capacitance value according to the environment temperature digital output value based on a preset load capacitance value library includes:

when the low-order value of the environment temperature digital output value is zero, the load capacitance storage value corresponding to the high-order value of the environment temperature digital output value is used as a temperature compensation load capacitance value;

and when the low-order value of the environment temperature digital output value is not zero, calculating the temperature compensation load capacitance value by utilizing the load capacitance storage value corresponding to the high-order value of the environment temperature digital output value and the next-stage load capacitance storage value corresponding to the high-order value of the environment temperature digital output value according to the low-order value of the environment temperature digital output value.

Further, the calculation formula for calculating the temperature compensation load capacitance value by using the load capacitance storage value corresponding to the high value of the environment temperature digital output value and the next-stage load capacitance storage value corresponding to the high value of the environment temperature digital output value according to the low value of the environment temperature digital output value is as follows:

wherein N is a temperature compensation value, k is a low value according to the environment temperature digital output value,the value of the load capacitance stored for the upper bits of the ambient temperature digital output value,and L is the low-order value digit of the environment temperature digital output value.

Based on the same inventive concept, the invention also provides a temperature compensation system of the crystal oscillator, comprising:

the acquisition module is used for acquiring an environment temperature digital output value by utilizing the environment temperature value of the crystal oscillator;

and the compensation module is used for carrying out temperature compensation on the crystal oscillator according to the environment temperature digital output value.

Compared with the closest prior art, the invention has the following beneficial effects:

acquiring an environment temperature digital output value by using an environment temperature value of a crystal oscillator; according to the environment temperature digital output value, temperature compensation is carried out on the crystal oscillator to acquire environment temperature, a voltage signal related to the temperature is subjected to digital filtering processing, a digital signal corresponding to current temperature information is obtained, a control capacitance value corresponding to the current temperature is obtained in a corresponding query mode, and the control capacitance value is pre-stored in a least square polynomial fitting mode and has uniqueness, so that the output temperature compensation effect can be guaranteed to be remarkable.

Drawings

FIG. 1 is a flow chart of a method for compensating temperature of a crystal oscillator according to the present invention;

FIG. 2 is a schematic diagram of a temperature compensation device for a crystal oscillator according to the present invention;

FIG. 3 is a schematic diagram of a digital signal processing circuit according to the present invention;

FIG. 4 is a schematic diagram of a digital signal processing circuit according to the present invention connected to a variable capacitor array;

FIG. 5 is a circuit diagram of a temperature compensation device for a crystal oscillator according to the present invention;

FIG. 6 is a schematic diagram of a crystal oscillator temperature-frequency relationship provided by the present invention;

FIG. 7 is a schematic diagram of a relationship between measured data and polynomial fitting data provided by the present invention;

fig. 8 is a schematic diagram of a temperature compensation system of a crystal oscillator according to the present invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

the invention provides a temperature compensation method of a crystal oscillator, as shown in fig. 1, comprising:

step 1: acquiring an environment temperature digital output value by using an environment temperature value of a crystal oscillator;

step 2: and carrying out temperature compensation on the crystal oscillator according to the environment temperature digital output value.

In this embodiment, a connection schematic of an apparatus for implementing temperature compensation of a crystal oscillator is shown in fig. 2.

The step 1 specifically comprises the following steps:

1-1, acquiring an environment temperature sampling value by using an environment temperature value of a crystal oscillator;

and 1-2, judging the size of the environment temperature sampling value and a preset moving average operation period value, if the size is smaller than the preset moving average operation period value, using the current environment temperature sampling value as an environment temperature digital output value, and otherwise, obtaining the environment temperature digital output value based on a moving average algorithm according to the environment temperature sampling value.

The step 1-1 specifically comprises:

wherein M is the moving average operation period value,in order to obtain the sensor resolution of the ambient temperature,in order to compensate for the period of ambient temperature,is the ambient temperature rate of change.

The step 2 specifically comprises the following steps:

2-1: acquiring a temperature compensation load capacitance value based on a preset load capacitance value library according to the environment temperature digital output value;

2-2: and performing temperature compensation on the crystal oscillator by using the temperature compensation load capacitance value.

The step 2-1 specifically comprises:

2-1-1: obtaining a load capacitance-temperature curve by using the environment temperature digital output value and a load capacitance value corresponding to the environment temperature digital output value based on a least square method;

2-1-2 obtaining load capacitance values corresponding to different environment temperature digital output values by using the environment temperature digital output values according to the load capacitance-temperature curve, and establishing a load capacitance value library.

2-1-3: when the low-order value of the environment temperature digital output value is zero, the load capacitance storage value corresponding to the high-order value of the environment temperature digital output value is used as a temperature compensation load capacitance value;

2-1-4: and when the low-order value of the environment temperature digital output value is not zero, calculating the temperature compensation load capacitance value by utilizing the load capacitance storage value corresponding to the high-order value of the environment temperature digital output value and the next-stage load capacitance storage value corresponding to the high-order value of the environment temperature digital output value according to the low-order value of the environment temperature digital output value.

In this embodiment, in the temperature compensation method for a crystal oscillator, the low-order value is 3bits, and the high-order value is 7 bits.

The steps 2-1-4 specifically comprise:

wherein N is a temperature compensation value, k is a low value according to the environment temperature digital output value,the value of the load capacitance stored for the upper bits of the ambient temperature digital output value,and L is the low-order value digit of the environment temperature digital output value.

In this embodiment, as shown in fig. 3, when the low 3bits value is zero, the temperature compensation load capacitance value is the load capacitance storage value corresponding to the high 7bits value of the environment temperature digital output value, when the low 3bits value of the environment temperature digital output value is 1, the low 3bits value of the environment temperature digital output value uses the load capacitance storage value corresponding to the high 7bits value of the environment temperature digital output value to take seven eighths of the value, the next-stage load capacitance storage value corresponding to the high 7bits value of the environment temperature digital output value calculates one eighth of the temperature compensation load capacitance value, and the temperature compensation load capacitance values are obtained by combining the values, and so on.

In this embodiment, a schematic connection diagram of a digital signal processing circuit and a variable capacitor array implemented by the method is shown in fig. 4.

In this embodiment, a schematic circuit connection between the crystal oscillator and the device for implementing the method is shown in fig. 5.

In this embodiment, a temperature compensation method for a crystal oscillator, a temperature-frequency relationship of the crystal oscillator is schematically shown in fig. 6.

In this embodiment, a relationship between measured data and polynomial fitting data is schematically shown in fig. 7.

Example 2:

as shown in fig. 8, the present invention provides a temperature compensation system for a crystal oscillator, comprising:

the acquisition module is used for acquiring an environment temperature digital output value by utilizing the environment temperature value of the crystal oscillator;

and the compensation module is used for carrying out temperature compensation on the crystal oscillator according to the environment temperature digital output value.

The obtaining of the digital output value of the ambient temperature by using the ambient temperature value of the crystal oscillator includes:

acquiring an environment temperature sampling value by using an environment temperature value of a crystal oscillator;

and judging the size of the environment temperature sampling value and a preset moving average operation period value, if the size is smaller than the preset moving average operation period value, using the current environment temperature sampling value as an environment temperature digital output value, and otherwise, obtaining the environment temperature digital output value based on a moving average algorithm according to the environment temperature sampling value.

The preset value of the moving average operation period value comprises the following steps:

wherein M is the moving average operation period value,in order to obtain the sensor resolution of the ambient temperature,in order to compensate for the period of ambient temperature,is the ambient temperature rate of change.

The temperature compensation of the crystal oscillator according to the environment temperature digital output value comprises the following steps:

acquiring a temperature compensation load capacitance value based on a preset load capacitance value library according to the environment temperature digital output value;

and performing temperature compensation on the crystal oscillator by using the temperature compensation load capacitance value.

The presetting of the load capacitance value library comprises the following steps:

obtaining a load capacitance-temperature curve by using the environment temperature digital output value and a load capacitance value corresponding to the environment temperature digital output value based on a least square method;

and obtaining load capacitance values corresponding to different environment temperature digital output values by using the environment temperature digital output values according to the load capacitance-temperature curve, and establishing a load capacitance value library.

The acquiring of the temperature compensation load capacitance value according to the environment temperature digital output value based on a preset load capacitance value library comprises:

when the low-order value of the environment temperature digital output value is zero, the load capacitance storage value corresponding to the high-order value of the environment temperature digital output value is used as a temperature compensation load capacitance value;

And when the low-order value of the environment temperature digital output value is not zero, calculating the temperature compensation load capacitance value by utilizing the load capacitance storage value corresponding to the high-order value of the environment temperature digital output value and the next-stage load capacitance storage value corresponding to the high-order value of the environment temperature digital output value according to the low-order value of the environment temperature digital output value.

The calculation formula for calculating the temperature compensation load capacitance value by using the load capacitance storage value corresponding to the high-order value of the environment temperature digital output value and the next-stage load capacitance storage value corresponding to the high-order value of the environment temperature digital output value according to the low-order value of the environment temperature digital output value is as follows:

wherein N is a temperature compensation value, k is a low value according to the environment temperature digital output value,the value of the load capacitance stored for the upper bits of the ambient temperature digital output value,and L is the low-order value digit of the environment temperature digital output value.

Example 3:

an SoC scheme for a crystal oscillator temperature compensation system is presented.

The temperature sensor generates an output voltage proportional to temperature using temperature characteristics of the PN junction. Specifically, the structure includes a mirror current source, a proportional bipolar transistor, and a resistor. The precisely matched current source sends the same current into the bipolar transistors with different proportions to generate a base collector voltage difference which is proportional to the temperature, and the voltage difference can be used as the output voltage of the temperature sensor V _TS . In a well-matched circuit, the saturation current of the bipolar transistor is only positively correlated with the base-emitter junction area, and the circuit structure can generate a positive temperature coefficient (PTAT) voltage with high linearity.

The A/D converter converts the positive temperature coefficient voltage output by the temperature sensorV _TS Conversion to N bits digital signalD _TS In this embodiment, a 10 bits successive approximation analog-to-digital converter is adopted, a Flash structure realized by voltage division of a resistor string is adopted for digital-to-analog conversion in each clock cycle, and linearity and monotonicity of a conversion result are ensured by layout wiring methods such as central symmetry, so that accuracy of table lookup and interpolation operation in a full temperature interval is realized. Because the sampling rate requirement of the analog-digital converter is not high, the precision can be improved by sacrificing the speed. The digital-to-analog converter in the successive approximation circuit can select structures such as a current rudder, a weight capacitor and a segmented resistor according to the mismatch level of a specific process and considering performance and cost. The analog-to-digital converter 22 may also be implemented using a pipeline, oversampling (sigma-delta), or other structure.

The voltage value output by the temperature sensor is taken into consideration the influence of the thermal noise of the circuit even under the environment with constant temperature V _TS There will also be some degree of fluctuation; thereby influencingD _TS Resulting in poor short term stability of the crystal oscillator output frequency. The method is characterized in that the environment temperature is a slowly-varying quantity, noise interference at the output end of the temperature sensor can be reduced in a low-pass filtering mode, the method is realized by adopting a moving average digital filtering mode, the digital signal processing circuit comprises a digital filter and a linear interpolation module, a period value M of moving average operation is reasonably set according to the change rate of the environment temperature, timely reaction to temperature change is guaranteed while the environment noise is filtered, boundary processing is carried out on the moving average filter, and when a sampling value is smaller than M, only a current value is taken as the output of the digital filter, so that the reliability of the output result of the filter cannot be influenced by an incorrect register preset value.

The output result of the analog-to-digital converter after being output by the moving average filterHigh 7bits ofLow 3bits for non-volatile memory addressingFor linear interpolation.

Due to the fact thatThe resolution of the compensation capacitor is 0.125 ℃, in the embodiment, the compensation of the crystal oscillator is realized by adopting a linear interpolation mode within a temperature range of 1 ℃, and in a larger temperature range, compensation capacitor control words corresponding to different temperatures are obtained by adopting a polynomial fitting mode. The frequency precision of the crystal oscillator after temperature compensation is ensured, and the expenditure of a temperature compensation system on a nonvolatile memory is saved.

The nonvolatile memory adopts a 128-byte structure corresponding to a 7-bit address signal given by the digital signal processing circuit. Each double byte corresponds to a capacitor array control word, wherein the six lower bits adopt binary coding, and the ten higher bits adopt thermometer coding, so that nonlinearity caused by capacitor mismatch is effectively inhibited.

For an N bits binary weight capacitor array, assuming that the capacitance value of a unit capacitor is C, the mismatch is CIn the extreme case, the maximum mismatch of the system occursToDuring the conversion, the maximum mismatch is. When N is large, monotonicity of the system cannot be guaranteed, and a convergence process in a temperature compensation process is affected.

The 16 bits capacitor array adopts a 10+6 structure, and the lower six bits are a binary weight capacitor array; the high ten bits are in a thermometer coding form, each bit change is only 1 unit capacitance change, and the linear adjustment process of the whole capacitor array is realized through the layout of central symmetry.

The digital signal processing circuit provides a proper load capacitance value according to the output of the digital-to-analog converter and data in the nonvolatile memory, and the frequency accuracy of the crystal oscillator is ensured.

The series resonant frequency of the crystal oscillator may be expressed as WhereinLIs the equivalent inductance of the crystal and is,C _S is the equivalent series capacitance of the crystal. When considering the packaging capacitance of the crystal and other parallel capacitorsC _P And a load capacitorC _L Then, the crystal oscillation frequency can be expressed as formula (1); by adjustingC _L The output frequency of the crystal oscillator can be adjusted when the load capacitance isC _L +ΔC _L The crystal oscillator frequency is expressed by equation (2).（1）

（2）

Load capacitance variationΔC _L Induced frequency changeΔωAs shown in the formula (3), in consideration ofΔC _L For relatively small amounts, equation (3) can be simplified toAnd the change of the frequency and the change of the load capacitor are in a linear relation, so that in the temperature compensation process of the crystal oscillator, the temperature curve of the load capacitor can be directly fitted according to the temperature characteristic curve of the frequency of the crystal, different temperature values are brought into the fitted curve, and the compensation capacitance value corresponding to the temperature can be obtained.（3）

In this embodiment, as shown in fig. 6, in order to ensure the accuracy of the fitting curve, the frequency-temperature characteristic curve of the crystal oscillator in the full temperature range is divided into three segments for fitting: a low temperature section (-45 ℃ to 0 ℃), a normal temperature section (0 ℃ to 50 ℃), and a high temperature section (50 ℃ to 90 ℃). Taking the low temperature section as an example, as shown in fig. 7, the quartic polynomial obtained by least square fitting substantially matches the measured data. In the same way, the frequency-temperature curve of the crystal oscillator is obtained by respectively fitting the normal temperature section and the high temperature section through a least square algorithm.

In this exampleLower 3 bits for linear interpolation and higher 7bits for addressing of preset compensation capacitance of crystal oscillator, thereforeAnd respectively carrying in corresponding curve segments obtained by the polynomial fitting, so as to obtain the preset temperature compensation capacitance value corresponding to each address in the nonvolatile memory.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.