Optimization method and system for electric power equipment tilt monitoring device based on low power consumption

Abstract

The present invention relates to the field of monitoring optimization technology, and discloses an optimization method and system for a tilt monitoring device of electric power equipment based on low power consumption, including obtaining the output signal amplitude of the tilt sensor and the input common mode voltage range of the operational amplifier, selecting several candidate operational amplifiers from multiple operational amplifiers according to the output signal amplitude, the input common mode voltage range and the standard parameters of the operational amplifier; using an operational amplifier test circuit to test the performance of each candidate operational amplifier to obtain the operational amplifier performance parameters, and selecting a preferred operational amplifier from the candidate operational amplifiers according to the operational amplifier performance parameters; integrating the preferred operational amplifier into a signal conditioning circuit, optimizing the structure of the signal conditioning circuit according to the power consumption characteristics of the preferred operational amplifier, and using a preset algorithm to perform adaptive power consumption control on the signal conditioning circuit. The present invention performs device selection and circuit optimization through comprehensive analysis, effectively reducing the overall power consumption of the monitoring device and improving the stability of the operation of the monitoring device.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring optimization, and in particular to an optimization method and system for a low-power-consumption electric power equipment tilt monitoring device. Background Art

[0002] In the power system, line towers are one of the basic infrastructures of the high-voltage power transmission system. With the development of the power supply industry, the use of line towers is increasing rapidly and is widely distributed. Towers installed in some adverse geological areas (such as goaf areas, landslide areas, swamp paddy fields, seaside typhoon areas, sandy land and high-salt frozen soil areas, etc.) usually have a certain degree of inclination. The inclination of the tower may cause the tower to collapse, which will seriously affect the power supply safety. Of course, for other power equipment such as transformers, the inclination will also affect the power supply safety. Therefore, inclination monitoring is a very necessary monitoring method.

[0003] At present, in the tilt monitoring device of power equipment based on low-power technology, the selection of op amps for the signal conditioning circuit of the inclination sensor has an important impact on the power consumption of the device. Due to the limited terminal power supply voltage, the power supply voltage range and common-mode input range of the op amp become key factors. When the output signal amplitude of the inclination sensor is small, in order to improve the signal-to-noise ratio, it is usually necessary to reasonably amplify the sensor signal, and the common-mode voltage of the op amp input stage will increase accordingly. However, many op amps will have a large static operating current under a higher common-mode voltage, resulting in a significant increase in system power consumption. In addition, due to the high output impedance of the inclination sensor, there will be a certain offset voltage at the input of the op amp, which further aggravates the impact of the common-mode voltage on power consumption. Therefore, in actual circuit design, how to balance the gain-bandwidth product, common-mode input range, output swing and other parameters of the op amp, and select appropriate devices to reduce system power consumption. And how to reasonably design and control circuit parameters based on the device to reduce the power consumption of the op amp in the actual working state is also a technical problem that needs to be solved urgently. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides an optimization method and system for an electric equipment tilt monitoring device based on low power consumption, so as to solve the problem of excessive power consumption of traditional tilt sensor signal conditioning circuits and achieve the effect of reducing the overall power consumption of the monitoring device.

[0005] In a first aspect, the present invention provides an optimization method for a low-power-consumption electric equipment tilt monitoring device, the method comprising:

[0006] Acquire the output signal amplitude of the tilt sensor and the input common-mode voltage range of the operational amplifier in the corresponding signal conditioning circuit, and select a plurality of candidate operational amplifiers from a plurality of operational amplifiers according to the output signal amplitude, the input common-mode voltage range and the standard parameters of the operational amplifier;

[0007] Using an operational amplifier test circuit to test the performance of each candidate operational amplifier under different input common mode voltages to obtain operational amplifier performance parameters, and selecting a preferred operational amplifier from the candidate operational amplifiers based on the operational amplifier performance parameters;

[0008] The preferred operational amplifier is integrated into a signal conditioning circuit, the structure of the signal conditioning circuit is optimized according to the power consumption characteristics of the preferred operational amplifier, and a preset algorithm is used to perform adaptive power consumption control on the signal conditioning circuit.

[0009] Furthermore, the step of selecting a plurality of candidate operational amplifiers from a plurality of operational amplifiers according to the output signal amplitude, the input common mode voltage range and the standard parameters of the operational amplifier comprises:

[0010] Sampling the common mode voltage of the output end of the tilt sensor to obtain a common mode voltage sampling value, and selecting a first operational amplifier sequence from a plurality of operational amplifiers according to the common mode voltage sampling value and the input common mode voltage range;

[0011] According to the output signal amplitude, the standard parameters of the operational amplifier and the closed-loop gain requirements of the signal conditioning circuit, the minimum signal amplitude of the inclination sensor, the operational amplifier gain multiples and the operational amplifier gain-bandwidth product of each operational amplifier in the first operational amplifier sequence and the closed-loop gain value of the signal conditioning circuit are obtained, and according to the minimum signal amplitude, the operational amplifier gain multiples, the operational amplifier gain-bandwidth product and the closed-loop gain value, a plurality of operational amplifiers are selected from the first operational amplifier sequence to obtain a second operational amplifier sequence;

[0012] The operational amplifiers in the second operational amplifier sequence are measured for offset voltage to obtain inherent offset and temperature drift, and multiple operational amplifiers are selected from the second operational amplifier sequence according to the inherent offset and the temperature drift to obtain candidate operational amplifiers.

[0013] Furthermore, the step of selecting a first operational amplifier sequence from a plurality of operational amplifiers according to the common mode voltage sampling value and the input common mode voltage range comprises:

[0014] Calculate the overlap between the common mode voltage sampling value and the input common mode voltage range to obtain the effective common mode range of each operational amplifier;

[0015] Obtaining the input and output swing ranges of each operational amplifier, and comparing the input and output swing ranges with the power supply voltage range of the power equipment tilt monitoring device to obtain a comparison result;

[0016] A first operational amplifier sequence is selected from the plurality of operational amplifiers according to the comparison result and the effective common mode range.

[0017] Further, the step of obtaining the minimum signal amplitude of the inclination sensor, the operational amplifier gain multiple and the operational amplifier gain-bandwidth product of each operational amplifier in the first operational amplifier sequence, and the closed-loop gain value of the signal conditioning circuit according to the output signal amplitude, the operational amplifier standard parameters, and the closed-loop gain requirement of the signal conditioning circuit, and selecting a plurality of operational amplifiers from the first operational amplifier sequence according to the minimum signal amplitude, the operational amplifier gain multiple, the operational amplifier gain-bandwidth product, and the closed-loop gain value to obtain the second operational amplifier sequence includes:

[0018] According to the relationship curve between the output signal amplitude and the inclination measurement range of the inclination sensor, the output voltage value corresponding to the minimum detection angle is obtained, and according to the angle resolution of the inclination sensor and the output voltage value, the minimum signal amplitude is obtained;

[0019] Determining the operational amplifier gain multiples of each operational amplifier in the first operational amplifier sequence according to the operational amplifier standard parameters;

[0020] According to the output dynamic response waveform of the tilt sensor, a highest frequency component is obtained, and according to the highest frequency component and the operational amplifier gain multiple, an operational amplifier gain-bandwidth product of each operational amplifier in the first operational amplifier sequence is obtained;

[0021] Determine the closed-loop gain value according to the closed-loop gain requirement of the signal conditioning circuit;

[0022] The minimum signal amplitude is compared with the operational amplifier gain multiple, and the operational amplifier gain multiple is compared with the closed-loop gain value, and according to the comparison result, a plurality of operational amplifiers are selected from the first operational amplifier sequence to obtain a second operational amplifier sequence.

[0023] Furthermore, the step of using an operational amplifier test circuit to test the performance of each candidate operational amplifier under different input common mode voltages to obtain operational amplifier performance parameters includes:

[0024] An operational amplifier power consumption test circuit is used to test the power consumption of each candidate operational amplifier under different input common mode voltages to obtain operational amplifier power consumption data, and data fitting is performed on the input common mode voltage and the corresponding operational amplifier power consumption data to obtain a voltage power consumption model, and the actual power consumption value of each candidate operational amplifier is determined according to the voltage power consumption model;

[0025] The operational amplifier noise test circuit is used to measure the operational amplifier input noise of each candidate operational amplifier, and the noise index is determined according to the measured value;

[0026] The bandwidth of each candidate op amp is measured by using an op amp closed-loop gain test circuit to obtain an op amp bandwidth index;

[0027] The operational amplifier stability test circuit is used to measure the phase margin of each candidate operational amplifier to obtain the phase margin index.

[0028] Furthermore, the step of selecting a preferred operational amplifier from candidate operational amplifiers according to the operational amplifier performance parameters includes:

[0029] Compare the actual power consumption value of each candidate operational amplifier with the upper power consumption threshold, and select the candidate operational amplifier whose actual power consumption value is less than the upper power consumption threshold as the first candidate operational amplifier;

[0030] Compare the noise index of each first candidate operational amplifier with the noise index threshold, and use the first candidate operational amplifier whose noise index is less than the noise index threshold as the second candidate operational amplifier;

[0031] Compare the op amp bandwidth index of each second candidate op amp with the bandwidth index threshold range, and use the second candidate op amp whose op amp bandwidth index is within the bandwidth index threshold range as the third candidate op amp;

[0032] The phase margin of each third candidate operational amplifier is compared with the phase margin threshold, and the third candidate operational amplifier whose phase margin is less than the phase margin threshold is selected as the preferred operational amplifier.

[0033] Furthermore, the step of comparing the actual power consumption value of each candidate operational amplifier with the upper power consumption threshold and selecting the candidate operational amplifier whose actual power consumption value is less than the upper power consumption threshold as the first candidate operational amplifier includes:

[0034] The actual power consumption values ​​of each candidate op amp at different test temperatures are compared with the corresponding upper power consumption threshold, and the candidate op amp whose actual power consumption values ​​at each test temperature are less than the upper power consumption threshold is selected as the first candidate op amp, wherein the upper power consumption threshold at different test temperatures is the product of the power consumption reference value and the temperature correction coefficient at the corresponding test temperature.

[0035] Furthermore, the step of integrating the preferred operational amplifier into a signal conditioning circuit and optimizing the structure of the signal conditioning circuit according to the power consumption characteristics of the preferred operational amplifier includes:

[0036] Constructing a bias current branch of a signal conditioning circuit according to megohm-level resistors, determining an op amp bias voltage according to static power consumption, a mid-voltage point, and a resistor divider network of the preferred op amp, and using the op amp bias voltage to drive the bias current branch;

[0037] An enabling control circuit of the preferred operational amplifier is constructed to implement switching control of the working state of the preferred operational amplifier.

[0038] Furthermore, the step of using a preset algorithm to perform adaptive power consumption control on the signal conditioning circuit includes:

[0039] Determine the angle change rate according to the angle data output by the inclination sensor, compare the angle change rate with a change rate threshold, adjust the sampling frequency of the inclination sensor according to the change rate comparison result, and dynamically adjust the working state of the operational amplifier in the signal conditioning circuit according to the adjusted sampling frequency;

[0040] The chip temperature of the operational amplifier is obtained, the chip temperature is compared with a temperature threshold, and the working state of the operational amplifier is controlled according to the temperature comparison result.

[0041] In a second aspect, the present invention provides an optimization system for a low-power-consumption electric equipment tilt monitoring device, wherein the electric equipment tilt monitoring device comprises a tilt sensor and a corresponding signal conditioning circuit, and the system comprises:

[0042] A first screening module is used to obtain the output signal amplitude of the tilt sensor and the input common mode voltage range of the operational amplifier in the corresponding signal conditioning circuit, and select a number of candidate operational amplifiers from a plurality of operational amplifiers according to the output signal amplitude, the input common mode voltage range and the standard parameters of the operational amplifier;

[0043] The second screening module is used to test the performance of each candidate operational amplifier under different input common mode voltages using an operational amplifier test circuit to obtain operational amplifier performance parameters, and select a preferred operational amplifier from the candidate operational amplifiers according to the operational amplifier performance parameters;

[0044] The power consumption optimization module is used to integrate the preferred operational amplifier into the signal conditioning circuit, optimize the structure of the signal conditioning circuit according to the power consumption characteristics of the preferred operational amplifier, and use a preset algorithm to perform adaptive power consumption control on the signal conditioning circuit.

[0045] The present invention provides an optimization method and system for a low-power-consumption electric equipment tilt monitoring device. The present invention can select the most suitable operational amplifier by evaluating the operational amplifier in the signal conditioning circuit from multiple aspects such as applicability and performance, thereby reducing the overall power consumption of the monitoring device, and through circuit structure optimization and power consumption control algorithm optimization, while further reducing the overall power consumption, ensure that the monitoring device can work stably and reliably. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a flow chart of an optimization method of a tilt monitoring device for electric equipment based on low power consumption in an embodiment of the present invention;

[0047] Figure 2 It is a structural schematic diagram of an optimization system of a low-power-consumption electric equipment tilt monitoring device in an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] See also Figure 1 The first embodiment of the present invention proposes an optimization method for a low-power-consumption electric equipment tilt monitoring device, which includes steps S10 to S30:

[0050] Step S10, obtaining the output signal amplitude of the tilt sensor and the input common mode voltage range of the operational amplifier in the corresponding signal conditioning circuit, and selecting a plurality of candidate operational amplifiers from a plurality of operational amplifiers according to the output signal amplitude, the input common mode voltage range and the standard parameters of the operational amplifier;

[0051] Step S20, using an operational amplifier test circuit to test the performance of each candidate operational amplifier under different input common mode voltages to obtain operational amplifier performance parameters, and selecting a preferred operational amplifier from the candidate operational amplifiers based on the operational amplifier performance parameters;

[0052] Step S30, integrating the preferred operational amplifier into a signal conditioning circuit, optimizing the structure of the signal conditioning circuit according to the power consumption characteristics of the preferred operational amplifier, and using a preset algorithm to perform adaptive power consumption control on the signal conditioning circuit.

[0053] The present invention provides a method for optimizing a tilt monitoring device for electric equipment. The tilt monitoring device for electric equipment is mainly used to monitor the tilt state of electric equipment including power generation and transmission equipment such as poles, transformers, and lines. Preferably, in this embodiment, the monitoring device can use the narrowband Internet of Things NB-IoT communication technology to realize remote monitoring of various electric equipment. In this device, at least a tilt sensor is included to monitor the tilt angle. Of course, there may also be other sensors, such as temperature sensors, vibration sensors, etc. At the same time, the monitoring device also includes a signal conditioning circuit corresponding to the sensor. The monitoring device collects the tilt state of the electric equipment through the tilt sensor, and after signal processing through the signal conditioning circuit, the signal is transmitted through the NB-IoT communication technology. On this basis, the present invention mainly optimizes the selection of operational amplifiers in the signal conditioning circuit. By optimizing the selection of operational amplifiers, the problem of excessive power consumption of the traditional tilt sensor signal conditioning circuit is solved, and the power consumption of the device is minimized while ensuring the accuracy of signal acquisition.

[0054] As the signal conditioning circuit corresponding to the inclination sensor, the selection of its operational amplifier first needs to consider the working parameters of the corresponding inclination sensor. Therefore, in this embodiment, the first operational amplifier screening is performed according to the output signal amplitude of the inclination sensor and the input common mode voltage range of the operational amplifier in the corresponding signal conditioning circuit. The specific steps include:

[0055] Sampling the common mode voltage of the output end of the tilt sensor to obtain a common mode voltage sampling value, and selecting a first operational amplifier sequence from a plurality of operational amplifiers according to the common mode voltage sampling value and the input common mode voltage range;

[0056] According to the output signal amplitude, the standard parameters of the operational amplifier and the closed-loop gain requirements of the signal conditioning circuit, the minimum signal amplitude of the inclination sensor, the operational amplifier gain multiples and the operational amplifier gain-bandwidth product of each operational amplifier in the first operational amplifier sequence and the closed-loop gain value of the signal conditioning circuit are obtained, and according to the minimum signal amplitude, the operational amplifier gain multiples, the operational amplifier gain-bandwidth product and the closed-loop gain value, a plurality of operational amplifiers are selected from the first operational amplifier sequence to obtain a second operational amplifier sequence;

[0057] The operational amplifiers in the second operational amplifier sequence are measured for offset voltage to obtain inherent offset and temperature drift, and multiple operational amplifiers are selected from the second operational amplifier sequence according to the inherent offset and the temperature drift to obtain candidate operational amplifiers.

[0058] In this embodiment, the first screening of the operational amplifier is divided into three steps. The first step is to perform the first screening according to the common mode voltage of the tilt sensor, and select the first operational amplifier sequence from multiple operational amplifiers, and the steps include:

[0059] Calculate the overlap between the common mode voltage sampling value and the input common mode voltage range to obtain the effective common mode range of each operational amplifier;

[0060] Obtaining the input and output swing ranges of each operational amplifier, and comparing the input and output swing ranges with the power supply voltage range of the power equipment tilt monitoring device to obtain a comparison result;

[0061] A first operational amplifier sequence is selected from the plurality of operational amplifiers according to the comparison result and the effective common mode range.

[0062] In this embodiment, a common-mode voltage sampling value is first obtained from the output end of the inclination sensor. For example, a voltage signal proportional to the inclination angle output by the inclination sensor is extracted and measured through a differential amplifier circuit or other methods to obtain a common-mode voltage sampling value. Then, the overlap between the sampled common-mode voltage sampling value and the input common-mode voltage range of different types of operational amplifiers is calculated, and the effective common-mode range of each operational amplifier is generated according to the overlap. Obviously, the larger the effective common-mode range, the more compatible the operational amplifier is with the inclination sensor in processing the common-mode voltage. In this embodiment and subsequent descriptions, the operational amplifier refers to the operational amplifier.

[0063] Different operational amplifiers also have different input and output swing ranges. The input and output swing range refers to the input voltage range and output voltage range of the operational amplifier under normal operation. The input and output swing of the operational amplifier is related to the voltage of the power supply. For example, the output swing of the operational amplifier is usually small and cannot completely reach the power supply voltage. When the output voltage is close to the power supply voltage, the amplification performance of the operational amplifier will be significantly reduced, that is, the voltage of the power supply of the monitoring device will also affect the selection of the operation. Therefore, in this embodiment, the input and output swing ranges of each operational amplifier are compared with the voltage range of the power supply. If the input voltage exceeds the input swing range of the operational amplifier, the operational amplifier may not work properly or the output may be distorted. If the output swing of the operational amplifier can be very close to the power supply voltage, then this operational amplifier will make the performance of its internal transistor in the saturation and cutoff states more superior, thereby achieving a larger output swing. Then, according to the comparison results of the effective common mode range and the power supply voltage, for example, by threshold comparison, multiple operational amplifiers are selected from multiple operational amplifiers to form a first operational amplifier sequence.

[0064] It can be seen that in the first step of op amp screening, the voltage between the tilt sensor and the power supply and the op amp is compared to screen out the op amp with a more suitable voltage. According to the screened first op amp sequence, the second step of screening is carried out through the circuit gain. The specific steps include:

[0065] According to the relationship curve between the output signal amplitude and the inclination measurement range of the inclination sensor, the output voltage value corresponding to the minimum detection angle is obtained, and according to the angle resolution of the inclination sensor and the output voltage value, the minimum signal amplitude is obtained;

[0066] Determining the operational amplifier gain multiples of each operational amplifier in the first operational amplifier sequence according to the operational amplifier standard parameters;

[0067] According to the output dynamic response waveform of the tilt sensor, a highest frequency component is obtained, and according to the highest frequency component and the operational amplifier gain multiple, an operational amplifier gain-bandwidth product of each operational amplifier in the first operational amplifier sequence is obtained;

[0068] Determine the closed-loop gain value according to the closed-loop gain requirement of the signal conditioning circuit;

[0069] The minimum signal amplitude is compared with the operational amplifier gain multiple, and the operational amplifier gain multiple is compared with the closed-loop gain value, and according to the comparison result, a plurality of operational amplifiers are selected from the first operational amplifier sequence to obtain a second operational amplifier sequence.

[0070] In this embodiment, the output voltage value corresponding to the minimum detection angle is first obtained based on the relationship curve between the output signal amplitude of the inclination sensor and the inclination measurement range. The curve can be obtained through the sensor manual or experimental measurement. The angular resolution refers to the minimum angle change that the inclination sensor can detect, and the minimum signal amplitude refers to the voltage change output by the sensor at the minimum detection angle, that is, the minimum voltage difference that the sensor can recognize. After determining the angular resolution of the sensor (for example, 0.0001°) and the output voltage value corresponding to the minimum detection angle, it is assumed that the voltage change of the sensor within the angular resolution range (for example, from 0° to 0.0001°) is linear, so the voltage change corresponding to the angular resolution can be calculated through the proportional relationship:

[0071]

[0072] Where V max and V min The sensor is at the maximum measuring angle D max The corresponding output voltage value and minimum detection angle D min The corresponding output voltage value is: is the angular resolution, where V max and D max All of these can be obtained by referring to technical manuals or experimental measurements.

[0073] For the voltage change near the minimum detection angle, the above formula can be simplified to:

[0074]

[0075] Where V min1 is an angle D slightly larger than the minimum detection angle min1 The corresponding output voltage value, D min1 It can be set according to the actual situation. In ideal case, the angle resolution The corresponding voltage change ΔV min This is the minimum signal amplitude.

[0076] The minimum signal amplitude is the minimum voltage change that the sensor can produce at the minimum detection angle. This value can determine the minimum detectable signal of the op amp, thereby ensuring that the signal can be accurately amplified and identified after passing through the op amp.

[0077] The op amp gain multiples of each op amp are determined based on standard parameters of different types of operational amplifiers. The op amp gain multiples can be determined by dividing the output voltage of the op amp by the input voltage of the op amp.

[0078] The output dynamic response waveform of the tilt sensor contains the voltage signal generated by the sensor at different tilt angles. By analyzing this waveform, the highest frequency component (f_max), that is, the fastest changing part of the waveform, can be determined. The gain-bandwidth product (GBP) is an important parameter of the op amp, which represents the product of the op amp gain and bandwidth. Therefore, the op amp gain-bandwidth product can be calculated by the following formula:

[0079] GBP=f_max*G

[0080] Where G represents the above op amp gain multiple.

[0081] The closed-loop gain value of a signal conditioning circuit refers to the amplification factor of the input signal by the signal conditioning circuit. The closed-loop gain value is determined according to application requirements to ensure that the signal can be amplified to an appropriate level for subsequent circuit processing.

[0082] Through the above steps, the data that can be obtained include the minimum signal amplitude of the inclination sensor, the op amp gain multiples and the op amp gain-bandwidth product of each operational amplifier in the first op amp sequence, and the closed-loop gain value of the signal conditioning circuit. Among them, the minimum signal amplitude is closely related to the op amp gain multiple, and this correlation is mainly reflected in the needs of signal amplification and identification. The minimum signal amplitude of the inclination sensor refers to the minimum voltage change that can be generated at the minimum detection angle. This value is crucial to determine the minimum detectable signal of the op amp, because it is necessary to ensure that the signal can be accurately amplified and identified after passing through the op amp. The gain multiple of the op amp determines the degree to which the signal is amplified. The higher the gain multiple, the greater the degree to which the signal is amplified. However, the higher the gain multiple is, the better, because too high a gain multiple may introduce more noise, resulting in a decrease in signal quality. Therefore, when selecting the op amp gain multiple, it is necessary to weigh the signal amplification needs and noise suppression capabilities. Specifically, if the minimum signal amplitude of the inclination sensor is small, then in order to ensure that the signal can be accurately identified after amplification, it may be necessary to select an op amp with a higher gain multiple. This can amplify small signals to a sufficient level for subsequent circuit processing. Conversely, if the minimum signal amplitude of the tilt sensor is large, an op amp with a lower gain multiple can be selected to avoid introducing too much noise.

[0083] At the same time, the op amp gain-bandwidth product and the closed-loop gain value of the signal conditioning circuit are also closely related. The closed-loop gain is the amplification factor of the conditioning circuit on the input signal, which determines the proportional relationship between the output signal and the input signal. GBP is an important parameter of the op amp, which indicates the bandwidth of the op amp when the gain is 1, or the product of the gain and bandwidth of the op amp is a constant. It is equal to the frequency when the open-loop gain of the op amp crosses 0dB, and is a key indicator for evaluating the performance of the op amp at high frequencies. In a closed-loop circuit, the closed-loop gain affects its bandwidth. As the closed-loop gain increases, the bandwidth of the op amp decreases accordingly to keep the GBP unchanged. This means that if a higher closed-loop gain is required, an op amp with a higher GBP needs to be selected to ensure sufficient gain within the required frequency range.

[0084] According to the above two relationships, the minimum signal amplitude is compared with the operational amplifier gain multiple, and the operational amplifier gain multiple is compared with the closed-loop gain value. According to the two comparison results, multiple operational amplifiers that are more matched with the inclination sensor and the signal conditioning circuit are selected from the first operational amplifier sequence as the second operational amplifier sequence, thus completing the second step of screening.

[0085] The third step of screening is to conduct the final screening based on the offset voltage of the op amp. Specifically, the offset voltage of each operational amplifier in the second op amp sequence is measured. The inherent offset, also known as the input offset voltage, refers to the voltage value that needs to be compensated at the input end in order to make the output of the op amp zero. The input end of the op amp is short-circuited, and then the output voltage is measured. This output voltage is the offset voltage of the op amp, that is, the inherent offset voltage. The temperature drift, also known as the input offset voltage temperature drift, refers to the offset voltage of the op amp that changes with the temperature. It reflects the sensitivity of the op amp to temperature changes. By measuring the offset voltage of the op amp at different temperatures, and then calculating the ratio of these offset voltages to the temperature change, the temperature drift is obtained. In addition, the parameter information of the temperature drift is usually provided in the data sheet of the op amp, which can be directly consulted. After obtaining the inherent offset and temperature drift of the op amp, multiple operational amplifiers are selected from the second op amp sequence as candidate op amps by comparing with the offset threshold and the temperature drift threshold.

[0086] In this embodiment, a comprehensive analysis is performed on voltage, gain, offset voltage and other aspects to select candidate operational amplifiers that are compatible with the tilt sensor and signal conditioning circuit in the monitoring device from multiple operational amplifiers, thereby completing the first screening. The second screening is based on the first screening, and the preferred operational amplifier with better performance is selected by considering the performance of the operational amplifier under different input common mode voltages. The screening steps specifically include:

[0087] An operational amplifier power consumption test circuit is used to test the power consumption of each candidate operational amplifier under different input common mode voltages to obtain operational amplifier power consumption data, and data fitting is performed on the input common mode voltage and the corresponding operational amplifier power consumption data to obtain a voltage power consumption model, and the actual power consumption value of each candidate operational amplifier is determined according to the voltage power consumption model;

[0088] The operational amplifier noise test circuit is used to measure the operational amplifier input noise of each candidate operational amplifier, and the noise index is determined according to the measured value;

[0089] The bandwidth of each candidate op amp is measured by using an op amp closed-loop gain test circuit to obtain an op amp bandwidth index;

[0090] The operational amplifier stability test circuit is used to measure the phase margin of each candidate operational amplifier to obtain the phase margin index.

[0091] In this embodiment, performance testing is performed using an operational amplifier test circuit, wherein the operational amplifier test circuit includes multiple test circuits such as power consumption test, noise test, gain test and stability test. Specifically, the power consumption test circuit is used to test the candidate operational amplifier under different input common mode voltage conditions to obtain the operational amplifier power consumption data. For example, an excitation is applied to the input end of the test circuit according to a sinusoidal wave signal, the common mode voltage reference value is adjusted by a signal generator, and the current is collected at the output point of the operational amplifier to obtain a static current reference value under no-load and a load current value after adding resistance. The static power consumption of the operational amplifier is determined according to the product of the static current reference value and the operational amplifier power supply voltage, and the dynamic power consumption of the operational amplifier is determined according to the product of the load current value and the operational amplifier power supply voltage. The sum of the static power consumption and the dynamic power consumption is used as the operational amplifier power consumption data.

[0092] Then, the power consumption data of the operational amplifier and the input common mode voltage are fitted to construct a voltage power consumption model. Specifically, the operational amplifier input common mode voltage value and the power consumption data of the operational amplifier measured by the power consumption test circuit are first obtained, and the input common mode voltage value is generated within the power supply voltage range at a fixed interval. Then, a data point sequence is generated according to the input common mode voltage value and the power consumption data of the operational amplifier, and a third-order polynomial function is used to fit the data points, and the polynomial coefficient value is calculated according to the least squares criterion. The fitting curve equation is generated according to the residual square sum and the goodness of fit criterion, and the functional relationship between the common mode voltage and the power consumption is obtained from the fitting equation. The actual power consumption value of the operational amplifier is determined according to the voltage power consumption model of each operational amplifier. In a preferred embodiment, since the temperature will affect the power consumption of the operational amplifier, within the range of zero to seventy degrees, every ten degrees of temperature increase will cause the power consumption to increase by about 3%. Therefore, after obtaining the actual power consumption value, the corresponding temperature correction coefficient can be selected according to the current test temperature to correct the actual power consumption data. The temperature correction ensures that the power consumption data measured under different environmental conditions are comparable.

[0093] For noise testing, this embodiment uses an op amp noise test circuit to measure the op amp input noise of each candidate op amp to determine the noise index. Specifically, for the op amp noise test data, a bandpass filter is used to separate the input noise in the frequency domain, and the op amp noise index is obtained according to the root mean square value of the noise voltage in the signal frequency band. The noise index reflects the noise performance of the op amp in the actual application frequency band.

[0094] For bandwidth testing, this embodiment uses an op amp closed-loop gain test circuit to measure the bandwidth of each candidate op amp. Specifically, the op amp closed-loop gain test circuit collects the amplitude-frequency characteristic curve under the nominal gain multiple, calculates the negative three-decibel point bandwidth value from the frequency response data, and then compares the signal bandwidth with the calculated op amp bandwidth to obtain the op amp bandwidth index. The closed-loop gain test reflects the bandwidth characteristics of the op amp under actual working conditions. Assuming that for an op amp with a gain setting of one hundred times, the amplitude attenuation of a one hundred-hertz sinusoidal signal input does not exceed 0.1%, and the attenuation at ten kilohertz reaches 30%. The negative three-decibel frequency point is usually located near five kilohertz. The ratio of the signal bandwidth to the op amp bandwidth should be less than 0.2 to ensure the gain flatness within the entire signal frequency band.

[0095] For the phase margin test, this embodiment uses an op amp stability test circuit to measure the phase margin of each candidate op amp, and reads the phase delay at the unit gain frequency from the frequency response curve. The difference between the phase delay of the closed-loop op amp at the unit gain frequency and one hundred and eighty degrees is the phase margin. Too small a phase margin can cause the op amp to ring during step response, and even self-oscillate under certain operating conditions. In actual testing, the intersection of the phase curve and the amplitude curve on the frequency response curve reflects the phase margin. The higher the intersection frequency, the better the stability.

[0096] After obtaining the four performance parameters of power consumption, noise, bandwidth and phase margin through the above steps, the preferred op amp with the best performance is selected from the candidate op amps according to these performance parameters. The specific steps include:

[0097] Compare the actual power consumption value of each candidate operational amplifier with the upper power consumption threshold, and select the candidate operational amplifier whose actual power consumption value is less than the upper power consumption threshold as the first candidate operational amplifier;

[0098] Compare the noise index of each first candidate operational amplifier with the noise index threshold, and use the first candidate operational amplifier whose noise index is less than the noise index threshold as the second candidate operational amplifier;

[0099] Compare the op amp bandwidth index of each second candidate op amp with the bandwidth index threshold range, and use the second candidate op amp whose op amp bandwidth index is within the bandwidth index threshold range as the third candidate op amp;

[0100] The phase margin of each third candidate operational amplifier is compared with the phase margin threshold, and the third candidate operational amplifier whose phase margin is less than the phase margin threshold is selected as the preferred operational amplifier.

[0101] In this embodiment, firstly, according to the comparison result between the actual power consumption value and the upper limit threshold of power consumption, the candidate operational amplifiers are screened for the first time, and the first candidate operational amplifier with a power consumption less than the upper limit threshold is selected. The upper limit threshold of power consumption here can be determined according to the power consumption reference value of the operational amplifier. Preferably, considering the influence of temperature on power consumption, when performing power consumption test, when multiple tests are performed at different test temperatures and no temperature correction is performed, when performing threshold comparison, the power consumption reference value can be multiplied by the corresponding temperature correction coefficient to perform temperature correction on the upper limit threshold. Similarly, the effect of comparing power consumption at different temperatures can be achieved. By comparing the power consumption values, operational amplifiers with lower power consumption can be screened out.

[0102] For the first candidate operational amplifier screened out, a second screening is performed based on the comparison between the noise index and the noise index threshold, and a second candidate operational amplifier having a noise index less than the noise index threshold is screened out. The second candidate operational amplifier has good noise performance on the basis of low power consumption.

[0103] For the second candidate op amp, its op amp bandwidth index is compared with the bandwidth index threshold, where the bandwidth index threshold includes the maximum threshold and the minimum threshold. The ratio of signal bandwidth to op amp bandwidth is not the larger or smaller the better. If the signal bandwidth is much smaller than the op amp bandwidth, then the op amp will have enough bandwidth margin when processing the signal, so that it may be easier to maintain the flatness of the gain. However, this does not mean that the smaller the ratio, the better, because too small a ratio may cause the op amp resources to be underutilized, increasing the cost. If the signal bandwidth is close to or greater than the op amp bandwidth, then the op amp may encounter bandwidth limitations when processing the signal, causing the gain to drop in the high-frequency part, thereby affecting the gain flatness. In addition, problems such as nonlinear distortion and phase delay may also become more serious. Therefore, in order to ensure the gain flatness within the entire signal frequency band, it is necessary to weigh the relative relationship between the signal bandwidth and the op amp bandwidth, and it is necessary to select an op amp with sufficient bandwidth margin to ensure that the signal can be stably amplified within the entire frequency band. Therefore, in this embodiment, a threshold range is provided to limit the bandwidth of the op amp.

[0104] For the op amps within the bandwidth index threshold range, the phase margin and the phase margin threshold will be judged. The ideal phase margin should be greater than 45 degrees. The higher the phase margin, the better the stability. Therefore, by comparing with the phase margin threshold, the op amp with the best stability can be selected as the final preferred op amp. In this embodiment, the applicability of the candidate op amps is comprehensively evaluated through power consumption, noise, bandwidth and stability, and the operational amplifier with the best power consumption characteristics and performance can be selected as the preferred op amp for the signal conditioning circuit, so that the signal conditioning circuit has the effect of low power consumption and high performance.

[0105] After the preferred op amp is integrated into the signal conditioning circuit, the structure of the signal conditioning circuit can be optimized according to the power consumption performance of the preferred op amp to further reduce power consumption. The specific steps include:

[0106] Constructing a bias current branch of a signal conditioning circuit according to megohm-level resistors, determining an op amp bias voltage according to static power consumption, a mid-voltage point, and a resistor divider network of the preferred op amp, and using the op amp bias voltage to drive the bias current branch;

[0107] An enabling control circuit of the preferred operational amplifier is constructed to implement switching control of the working state of the preferred operational amplifier.

[0108] In the present embodiment, the bias current branch is a necessary structure in a conventional signal conditioning circuit. The bias current directly affects the static power consumption of the operational amplifier. Therefore, the bias current branch of the present embodiment is composed of megohm resistors and has a smaller static power consumption. The driving voltage of the bias current branch, i.e., the bias voltage of the operational amplifier, is obtained based on the mid-voltage point and the resistor divider network. Specifically, based on the characteristic that the input common-mode voltage range of the operational amplifier is from zero volts to the positive power supply voltage, the minimum power consumption position is searched from the mid-voltage point to both ends, and the positive power supply voltage is reduced to the mid-point voltage value through a fifty-to-one resistor divider network. A 2.5 volt constant voltage output is obtained from the reference voltage chip, and the input bias voltage of the operational amplifier is generated according to the resistor divider ratio. The bias current branch is formed by megohm resistors, and the voltage drop is detected from both ends of the bias resistor to calculate the current value. The bias current is limited to less than one microampere by connecting a ten-megohm resistor in series, and the bias current is compensated according to the leakage current upper limit curve. The bias resistance value is set according to the standby current threshold.

[0109] The selection of input and output resistors involves overcurrent protection and bandwidth limitation. The instantaneous value of the load current is collected from the input and output ends of the op amp. The input overcurrent is limited by connecting a 100-kilo-ohm resistor in series with the input stage. Short-circuit protection is achieved by connecting a 10-kilo-ohm resistor in series with the output stage. The power consumption value is calculated based on the load current and operating voltage product curve, and the protection resistance value is set according to the load margin curve.

[0110] At the same time, an enable control circuit is added to the op amp, and the enable control of the op amp is set to use low-level effective logic. A low-level shutdown signal is input from the op amp enable terminal, and the op amp enters a normal working state through a rising edge trigger. The internal bias circuit is turned on and off according to the enable pulse output by the switch controller, and the idle module power supply is cut off according to the shutdown delay signal. Specifically, the product of the load current and the power supply voltage reflects the dynamic power consumption. When working at full load, the output stage power consumption can account for 50% of the total power consumption. Therefore, the enable control of the op amp uses low-level effective logic. When the enable terminal is grounded, the op amp enters the shutdown state, the internal bias circuit is disconnected, and the power consumption will be significantly reduced. The recovery time from shutdown to normal operation is in microseconds. The conduction sequence of the bias circuit is controlled by a rising edge trigger. The switch controller outputs a kilohertz enable pulse with a duty cycle of 10%, so that the op amp works in intermittent mode, and the average power consumption is reduced to 10% of that of continuous operation. The idle module includes circuits such as reference source and temperature compensation, which automatically cut off the power supply in standby mode to further reduce power consumption. It should be noted that the optimization of the circuit structure such as the resistance, voltage and bias current branch in this embodiment is optimized on the basis of the conventional signal conditioning circuit. For other parts of the signal conditioning circuit, the conventional signal conditioning circuit structure can be referred to. In addition, the structural optimization step in this embodiment is only a preferred optimization method, not a specific limitation. According to the selected preferred op amp, other adaptive adjustments can be made to the signal conditioning circuit to reduce the power consumption of the circuit, which will not be repeated here.

[0111] In addition to optimizing the structure of the signal conditioning circuit, the present invention also provides an optimization algorithm to control the power consumption of the signal conditioning circuit, and the algorithm includes:

[0112] Determine the angle change rate according to the angle data output by the inclination sensor, compare the angle change rate with a change rate threshold, adjust the sampling frequency of the inclination sensor according to the change rate comparison result, and dynamically adjust the working state of the operational amplifier in the signal conditioning circuit according to the adjusted sampling frequency;

[0113] The chip temperature of the operational amplifier is obtained, the chip temperature is compared with a temperature threshold, and the working state of the operational amplifier is controlled according to the temperature comparison result.

[0114] In this embodiment, the adaptive power consumption control algorithm mainly controls the working state of the operational amplifier through the angle change collected by the inclination sensor and the temperature change of the operational amplifier, thereby realizing the power consumption control of the signal conditioning circuit. Specifically, firstly, the angle value output by the inclination sensor during operation is obtained. The angle value will change with time. The angle change rate can be obtained by calculating the difference between two sampling values ​​at a fixed time interval. Preferably, before calculating the angle change rate, the angle change data can be filtered using a sliding window averager to ensure the calculation accuracy of the angle change rate.

[0115] The tilt sensor monitors the tilt state of the power equipment, so the angle change rate essentially reflects the motion state of the monitored object. In this embodiment, the change rate threshold is set to determine whether the monitored object is moving or in a static state, and the sampling frequency of the tilt sensor is adjusted according to the state of the monitored object. For example, when the monitored object is in a static state, the sampling frequency of the tilt sensor is reduced, and when the monitored object is in a moving state, the sampling frequency of the tilt sensor is increased. When the sampling frequency of the tilt sensor changes, the working state of the operational amplifier in the signal conditioning circuit is adjusted according to the generated sampling timing signal. The working state here includes a static working state, a dynamic working state and a deep sleep state. By dynamically adjusting the working state of the operational amplifier, the overall power consumption of the signal conditioning circuit can be effectively reduced.

[0116] In addition to the dynamic adjustment of the working state based on the sampling frequency, another power consumption control in this embodiment is the control based on the temperature, and the temperature protection provides another layer of restriction on the working state of the operational amplifier. Specifically, the normal working parameters of the operational amplifier include the temperature parameters, that is, when the chip temperature is within the standard operating temperature range, the operational amplifier can work normally. When the chip temperature is too high, it not only affects the performance of the operational amplifier, such as the open-loop gain and stability, but also increases the failure probability of the operational amplifier, including device damage and increased failure rate. Therefore, in this embodiment, the operational amplifier is thermally protected by monitoring the temperature of the chip. When the chip temperature is too high, the working state of the operational amplifier is adjusted downward, such as from the dynamic working state to the static working state. When the chip temperature is still too high, its working state can be adjusted to a deep sleep state. In addition, when the temperature limit conflicts with the angle change rate requirement, the temperature protection is performed first, sacrificing the sampling accuracy in exchange for the reliability of the device. In actual monitoring, the temperature limit exceeds the limit mainly when the ambient temperature rises or the load is too heavy. By reducing the working intensity, the chip damage is avoided. Through the power consumption control algorithm of this embodiment, not only the power consumption of the signal conditioning circuit is effectively reduced, but also the stability of the operation of the signal conditioning circuit is improved, thereby achieving optimized control of low power consumption and high stability of the power equipment tilt monitoring device.

[0117] This embodiment provides an optimization method for a tilt monitoring device for electric equipment based on low power consumption. The present invention evaluates the applicability of the operational amplifier corresponding to the tilt sensor through multiple aspects such as power consumption, noise, bandwidth and stability, and through comprehensive judgment of the performance of the operational amplifier, it can obtain the operational amplifier that is most suitable for the signal conditioning circuit, thereby reducing the overall power consumption of the monitoring device. In addition, the present invention further reduces the overall power consumption through circuit structure optimization and power consumption control algorithm optimization, while ensuring that the monitoring device can work stably and reliably. The optimization method provided by the present invention can not only be applied to the power consumption control of the signal conditioning circuit of the tilt sensor of the tilt monitoring device for electric equipment, but also to other sensors used for state monitoring, such as temperature sensors, vibration sensors, etc., and their corresponding signal conditioning circuits can all be optimized for power consumption using the optimization method provided by the present invention. Therefore, the optimization method provided by the present invention also has high versatility and practicality.

[0118] See also Figure 2 Based on the same inventive concept, the second embodiment of the present invention proposes an optimization system for a low-power-consumption electric equipment tilt monitoring device, wherein the electric equipment tilt monitoring device includes a tilt sensor and a corresponding signal conditioning circuit, and the system includes:

[0119] The first screening module 10 is used to obtain the output signal amplitude of the tilt sensor and the input common mode voltage range of the operational amplifier in the corresponding signal conditioning circuit, and select a number of candidate operational amplifiers from a plurality of operational amplifiers according to the output signal amplitude, the input common mode voltage range and the standard parameters of the operational amplifier;

[0120] The second screening module 20 is used to test the performance of each candidate operational amplifier under different input common mode voltages using an operational amplifier test circuit to obtain operational amplifier performance parameters, and select a preferred operational amplifier from the candidate operational amplifiers according to the operational amplifier performance parameters;

[0121] The power consumption optimization module 30 is used to integrate the preferred operational amplifier into the signal conditioning circuit, optimize the structure of the signal conditioning circuit according to the power consumption characteristics of the preferred operational amplifier, and use a preset algorithm to perform adaptive power consumption control on the signal conditioning circuit.

[0122] The technical features and technical effects of the optimization system for the low-power-consumption electric equipment tilt monitoring device proposed in the embodiment of the present invention are the same as the method proposed in the embodiment of the present invention, and will not be described in detail here. Each module in the above-mentioned optimization system for the low-power-consumption electric equipment tilt monitoring device can be implemented in whole or in part through software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above-mentioned modules.

[0123] In summary, an optimization method and system for an electric power equipment tilt monitoring device based on low power consumption is proposed in an embodiment of the present invention. The method obtains the output signal amplitude of the tilt sensor and the input common-mode voltage range of the operational amplifier in the corresponding signal conditioning circuit, and selects several candidate operational amplifiers from multiple operational amplifiers according to the output signal amplitude, the input common-mode voltage range and the standard parameters of the operational amplifier; uses an operational amplifier test circuit to test the performance of each candidate operational amplifier under different input common-mode voltages to obtain operational amplifier performance parameters, and selects a preferred operational amplifier from the candidate operational amplifiers according to the operational amplifier performance parameters; integrates the preferred operational amplifier into the signal conditioning circuit, optimizes the structure of the signal conditioning circuit according to the power consumption characteristics of the preferred operational amplifier, and uses a preset algorithm to perform adaptive power consumption control on the signal conditioning circuit. The present invention evaluates the suitability of the operational amplifier corresponding to the inclination sensor through power consumption, noise, bandwidth, stability and other aspects, and by comprehensively judging the performance of the operational amplifier, it is possible to obtain the operational amplifier that is most suitable for the signal conditioning circuit, thereby reducing the overall power consumption of the monitoring device. In addition, the present invention further reduces the overall power consumption through circuit structure optimization and power consumption control algorithm optimization, while ensuring that the monitoring device can work stably and reliably. The optimization method provided by the present invention can not only be applied to the power consumption control of the signal conditioning circuit of the inclination sensor of the inclination monitoring device of the power equipment, but also to other sensors used for state monitoring, such as temperature sensors, vibration sensors, etc., and their corresponding signal conditioning circuits can all be optimized for power consumption using the optimization method provided by the present invention. Therefore, the optimization method provided by the present invention also has high versatility and practicality.

[0124] Each embodiment in this specification is described in a progressive manner, and the same or similar parts of each embodiment can be directly referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. It should be noted that the technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0125] The above-mentioned embodiments only express several preferred implementation modes of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in the technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be regarded as the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be based on the protection scope of the claims.

Claims

1. An optimization method for a low-power-consumption electric equipment tilt monitoring device, characterized in that: The electric power equipment tilt monitoring device comprises a tilt sensor and a corresponding signal conditioning circuit, and the method comprises: Acquire the output signal amplitude of the tilt sensor and the input common mode voltage range of the operational amplifier in the corresponding signal conditioning circuit, and select a plurality of candidate operational amplifiers from a plurality of operational amplifiers according to the output signal amplitude, the input common mode voltage range and the standard parameters of the operational amplifier; An operational amplifier test circuit is used to test the performance of each candidate operational amplifier under different input common mode voltages to obtain operational amplifier performance parameters, and a preferred operational amplifier is selected from the candidate operational amplifiers according to the operational amplifier performance parameters, wherein the operational amplifier performance parameters include actual power consumption value, noise index, operational amplifier bandwidth index and phase margin index; Integrating the preferred operational amplifier into a signal conditioning circuit, optimizing the structure of the signal conditioning circuit according to the power consumption characteristics of the preferred operational amplifier, and using a preset algorithm to perform adaptive power consumption control on the signal conditioning circuit; The step of selecting a plurality of candidate operational amplifiers from a plurality of operational amplifiers according to the output signal amplitude, the input common mode voltage range and the standard parameters of the operational amplifier comprises: Sampling the common-mode voltage at the output end of the tilt sensor to obtain a common-mode voltage sampling value, and selecting a first operational amplifier sequence from a plurality of operational amplifiers according to the common-mode voltage sampling value and the input common-mode voltage range; According to the output signal amplitude, the standard parameters of the operational amplifier and the closed-loop gain requirements of the signal conditioning circuit, the minimum signal amplitude of the inclination sensor, the operational amplifier gain multiples and the operational amplifier gain-bandwidth product of each operational amplifier in the first operational amplifier sequence and the closed-loop gain value of the signal conditioning circuit are obtained, and according to the minimum signal amplitude, the operational amplifier gain multiples, the operational amplifier gain-bandwidth product and the closed-loop gain value, a plurality of operational amplifiers are selected from the first operational amplifier sequence to obtain a second operational amplifier sequence; Measuring offset voltages of operational amplifiers in the second operational amplifier sequence to obtain inherent offset and temperature drift, and selecting multiple operational amplifiers from the second operational amplifier sequence according to the inherent offset and the temperature drift to obtain candidate operational amplifiers; The step of selecting a preferred operational amplifier from candidate operational amplifiers according to the operational amplifier performance parameters comprises: Compare the actual power consumption value of each candidate operational amplifier with the upper power consumption threshold, and select the candidate operational amplifier whose actual power consumption value is less than the upper power consumption threshold as the first candidate operational amplifier; Compare the noise index of each first candidate operational amplifier with the noise index threshold, and use the first candidate operational amplifier whose noise index is less than the noise index threshold as the second candidate operational amplifier; Compare the op amp bandwidth index of each second candidate op amp with the bandwidth index threshold range, and use the second candidate op amp whose op amp bandwidth index is within the bandwidth index threshold range as the third candidate op amp; The phase margin index of each third candidate operational amplifier is compared with the phase margin threshold, and the third candidate operational amplifier whose phase margin index is smaller than the phase margin threshold is selected as the preferred operational amplifier.

2. The optimization method of the low-power-consumption electric equipment tilt monitoring device according to claim 1, characterized in that: The step of selecting a first operational amplifier sequence from a plurality of operational amplifiers according to the common mode voltage sampling value and the input common mode voltage range comprises: Calculate the overlap between the common mode voltage sampling value and the input common mode voltage range to obtain the effective common mode range of each operational amplifier; Obtaining the input and output swing ranges of each operational amplifier, and comparing the input and output swing ranges with the power supply voltage range of the power equipment tilt monitoring device to obtain a comparison result; A first operational amplifier sequence is selected from the plurality of operational amplifiers according to the comparison result and the effective common mode range.

3. The optimization method of the low-power-consumption electric equipment tilt monitoring device according to claim 1, characterized in that: The step of obtaining the minimum signal amplitude of the tilt sensor, the operational amplifier gain multiple and the operational amplifier gain-bandwidth product of each operational amplifier in the first operational amplifier sequence, and the closed-loop gain value of the signal conditioning circuit according to the output signal amplitude, the operational amplifier standard parameters, and the closed-loop gain requirement of the signal conditioning circuit, and selecting a plurality of operational amplifiers from the first operational amplifier sequence according to the minimum signal amplitude, the operational amplifier gain multiple, the operational amplifier gain-bandwidth product, and the closed-loop gain value to obtain the second operational amplifier sequence comprises: According to the relationship curve between the output signal amplitude and the inclination measurement range of the inclination sensor, the output voltage value corresponding to the minimum detection angle is obtained, and according to the angle resolution of the inclination sensor and the output voltage value, the minimum signal amplitude is obtained; Determining the operational amplifier gain multiples of each operational amplifier in the first operational amplifier sequence according to the operational amplifier standard parameters; According to the output dynamic response waveform of the tilt sensor, a highest frequency component is obtained, and according to the highest frequency component and the operational amplifier gain multiple, an operational amplifier gain-bandwidth product of each operational amplifier in the first operational amplifier sequence is obtained; Determine the closed-loop gain value according to the closed-loop gain requirement of the signal conditioning circuit; The minimum signal amplitude is compared with the operational amplifier gain multiple, and the operational amplifier gain multiple is compared with the closed-loop gain value, and according to the comparison result, a plurality of operational amplifiers are selected from the first operational amplifier sequence to obtain a second operational amplifier sequence.

4. The optimization method of the low-power-consumption electric equipment tilt monitoring device according to claim 1, characterized in that: The step of using an operational amplifier test circuit to test the performance of each candidate operational amplifier under different input common mode voltages to obtain the operational amplifier performance parameters comprises: An operational amplifier power consumption test circuit is used to test the power consumption of each candidate operational amplifier under different input common mode voltages to obtain operational amplifier power consumption data, and data fitting is performed on the input common mode voltage and the corresponding operational amplifier power consumption data to obtain a voltage power consumption model, and the actual power consumption value of each candidate operational amplifier is determined according to the voltage power consumption model; The operational amplifier noise test circuit is used to measure the operational amplifier input noise of each candidate operational amplifier, and the noise index is determined according to the measured value; The bandwidth of each candidate op amp is measured by using an op amp closed-loop gain test circuit to obtain an op amp bandwidth index; The operational amplifier stability test circuit is used to measure the phase margin of each candidate operational amplifier to obtain the phase margin index.

5. The optimization method of the low-power-consumption electric equipment tilt monitoring device according to claim 1, characterized in that: The step of comparing the actual power consumption value of each candidate operational amplifier with the upper power consumption threshold and selecting the candidate operational amplifier whose actual power consumption value is less than the upper power consumption threshold as the first candidate operational amplifier comprises: The actual power consumption values ​​of each candidate op amp at different test temperatures are compared with the corresponding upper power consumption threshold, and the candidate op amp whose actual power consumption values ​​at each test temperature are less than the upper power consumption threshold is selected as the first candidate op amp, wherein the upper power consumption threshold at different test temperatures is the product of the power consumption reference value and the temperature correction coefficient at the corresponding test temperature.

6. The optimization method of the low-power-consumption electric equipment tilt monitoring device according to claim 1, characterized in that: The step of integrating the preferred operational amplifier into the signal conditioning circuit and optimizing the structure of the signal conditioning circuit according to the power consumption characteristics of the preferred operational amplifier comprises: Constructing a bias current branch of a signal conditioning circuit according to megohm-level resistors, determining an op amp bias voltage according to static power consumption, a mid-voltage point, and a resistor divider network of the preferred op amp, and using the op amp bias voltage to drive the bias current branch; An enabling control circuit of the preferred operational amplifier is constructed to implement switching control of the working state of the preferred operational amplifier.

7. The optimization method of the low-power-consumption electric equipment tilt monitoring device according to claim 1, characterized in that: The step of using a preset algorithm to perform adaptive power consumption control on the signal conditioning circuit includes: Determine the angle change rate according to the angle data output by the inclination sensor, compare the angle change rate with a change rate threshold, adjust the sampling frequency of the inclination sensor according to the change rate comparison result, and dynamically adjust the working state of the operational amplifier in the signal conditioning circuit according to the adjusted sampling frequency; The chip temperature of the operational amplifier is obtained, the chip temperature is compared with a temperature threshold, and the working state of the operational amplifier is controlled according to the temperature comparison result.

8. An optimization system for a low-power-consumption electric equipment tilt monitoring device, characterized in that: The electric power equipment tilt monitoring device includes a tilt sensor and a corresponding signal conditioning circuit, and the system includes: A first screening module is used to obtain the output signal amplitude of the tilt sensor and the input common mode voltage range of the operational amplifier in the corresponding signal conditioning circuit, and select a number of candidate operational amplifiers from a plurality of operational amplifiers according to the output signal amplitude, the input common mode voltage range and the standard parameters of the operational amplifier; The step of selecting a plurality of candidate operational amplifiers from a plurality of operational amplifiers according to the output signal amplitude, the input common mode voltage range and the standard parameters of the operational amplifier comprises: Sampling the common-mode voltage at the output end of the tilt sensor to obtain a common-mode voltage sampling value, and selecting a first operational amplifier sequence from a plurality of operational amplifiers according to the common-mode voltage sampling value and the input common-mode voltage range; According to the output signal amplitude, the standard parameters of the operational amplifier and the closed-loop gain requirements of the signal conditioning circuit, the minimum signal amplitude of the inclination sensor, the operational amplifier gain multiples and the operational amplifier gain-bandwidth product of each operational amplifier in the first operational amplifier sequence and the closed-loop gain value of the signal conditioning circuit are obtained, and according to the minimum signal amplitude, the operational amplifier gain multiples, the operational amplifier gain-bandwidth product and the closed-loop gain value, a plurality of operational amplifiers are selected from the first operational amplifier sequence to obtain a second operational amplifier sequence; Measuring offset voltages of operational amplifiers in the second operational amplifier sequence to obtain inherent offset and temperature drift, and selecting multiple operational amplifiers from the second operational amplifier sequence according to the inherent offset and the temperature drift to obtain candidate operational amplifiers; The second screening module is used to test the performance of each candidate operational amplifier under different input common mode voltages using an operational amplifier test circuit to obtain operational amplifier performance parameters, and select a preferred operational amplifier from the candidate operational amplifiers according to the operational amplifier performance parameters, wherein the operational amplifier performance parameters include actual power consumption value, noise index, operational amplifier bandwidth index and phase margin index; The step of selecting a preferred operational amplifier from candidate operational amplifiers according to the operational amplifier performance parameters comprises: Compare the actual power consumption value of each candidate operational amplifier with the upper power consumption threshold, and select the candidate operational amplifier whose actual power consumption value is less than the upper power consumption threshold as the first candidate operational amplifier; Compare the noise index of each first candidate operational amplifier with the noise index threshold, and use the first candidate operational amplifier whose noise index is less than the noise index threshold as the second candidate operational amplifier; Compare the op amp bandwidth index of each second candidate op amp with the bandwidth index threshold range, and use the second candidate op amp whose op amp bandwidth index is within the bandwidth index threshold range as the third candidate op amp; Comparing the phase margin index of each third candidate operational amplifier with the phase margin threshold, and selecting the third candidate operational amplifier whose phase margin index is smaller than the phase margin threshold as the preferred operational amplifier; The power consumption optimization module is used to integrate the preferred operational amplifier into the signal conditioning circuit, optimize the structure of the signal conditioning circuit according to the power consumption characteristics of the preferred operational amplifier, and use a preset algorithm to perform adaptive power consumption control on the signal conditioning circuit.

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