CN116754823B - Control method of fluxgate vibration - Google Patents
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Abstract
The invention provides a control method of fluxgate oscillation, which is applied to a fluxgate current sensor and comprises the following steps: step 1: collecting real-time coil current of the fluxgate in a design measurement range of the fluxgate; step 2: obtaining the current change rate of the coil current of the fluxgate based on the real-time coil current, and judging whether the fluxgate reaches a saturated state or not according to the current change rate; step 3: when the fluxgate reaches a saturated state, the direction of the current change of the coil of the fluxgate is controlled to be reversed. The invention can keep good symmetry of the current curve of the fluxgate coil even when the measured current is not zero, reduce the subsequent signal processing difficulty, and simultaneously the method does not require the maximum current consumption of the fluxgate to reach the sensor to perform current inversion, thereby reducing the power consumption of the fluxgate sensor.
Description
Technical Field
The invention relates to the technical field of fluxgate current sensors, in particular to a control method of fluxgate oscillation.
Background
The fluxgate current sensor has the characteristics of high precision and low temperature drift, and is widely applied to occasions requiring current precision measurement. The existing fluxgate current sensor technology mainly adopts a scheme of self-excitation oscillation of a single iron core Shan Raozu, the scheme is mainly applied to current measurement of a measuring range below 1500A, and as the measured current increases, the consumption current of the fluxgate current sensor also increases, for example, the current consumption of the fluxgate current sensor of the 1500A measuring range can reach 1300mA at maximum when the 1500A current is measured, and the application scene of the fluxgate current sensor is greatly limited. In the prior art, a single-core self-excitation oscillation method is adopted to control the fluxgate oscillation: the circuit sets a fixed current comparison point, when the current in the fluxgate coil reaches the set maximum value or minimum value, the current change direction of the fluxgate coil is reversed, the method adopts the fixed current comparison point, when the measured current is not zero, the current curve in the coil loses symmetry, and further the change of the oscillation duty ratio is caused, the difficulty is brought to measurement, meanwhile, the method also prolongs the current reversal time of the circuit in one direction, and the power consumption of the whole sensor is increased, so the invention provides a fluxgate oscillation control method.
Disclosure of Invention
The invention provides a control method of fluxgate oscillation, which is used for solving the problems, and even when the measured current is not zero, the current curve of a fluxgate coil can keep good symmetry, so that the subsequent signal processing difficulty is reduced.
The invention provides a control method of fluxgate oscillation, which is applied to a fluxgate current sensor and comprises the following steps:
step 1: collecting real-time coil current of the fluxgate in a design measurement range of the fluxgate;
step 2: obtaining the current change rate of the coil current of the fluxgate based on the real-time coil current, and judging whether the fluxgate reaches a saturated state or not according to the current change rate;
step 3: when the fluxgate is judged to reach the saturation state, the direction of the coil current change of the fluxgate is controlled to be reversed.
Preferably, in step 2 of a method for controlling fluxgate oscillation, the method includes:
generating a coil current change image based on the real-time coil current, acquiring the slope of each point on the coil current change image, and determining the current change rate corresponding to each time point according to the slope;
when the current change rate reaches a preset value, judging that the fluxgate reaches a saturated state, and executing the step 3;
otherwise, judging that the magnetic flux gate does not reach saturation state, and executing the step 1.
Preferably, in step 3 of a method for controlling fluxgate oscillation, the method includes:
when the fluxgate reaches a saturation state, a saturation signal is sent to the current control module;
and after the current control module receives the saturation signal, taking the current time point as a signal reversing node, and controlling the direction reversal of the coil current change direction of the fluxgate.
Preferably, in step 3 of a method for controlling fluxgate oscillation, the method further includes:
and recording a time node for controlling the direction reversal of the coil current change direction of the fluxgate to generate a control operation log, and storing the control operation log.
Preferably, in a method for controlling fluxgate oscillation, controlling a direction reversal of a coil current change direction of a fluxgate includes:
the coil excitation voltage is controlled to generate phase inversion, the phase inversion excitation voltage is applied to two ends of the coil, and the direction of the coil current change is inverted.
Preferably, in the method for controlling fluxgate oscillation, step 1 includes:
collecting the current of a real-time coil of the fluxgate based on a preset collection strategy, repeatedly collecting the current for a plurality of times during each data collection in a first data collection stage, and calculating a data fluctuation coefficient of the repeated collection for a plurality of times;
when the data fluctuation coefficient is in a preset range, taking the average value of the data in the corresponding acquisition time acquired repeatedly for a plurality of times as the current acquired final real-time coil current;
when the fluctuation coefficient of the data is not in the preset range, determining a fluctuation mutation point, and carrying out weighted average on the data before the fluctuation mutation point to obtain the current acquired final real-time coil current;
taking the real-time coil current corresponding to the fluctuation mutation point as the final real-time coil current of new data acquisition, and triggering a second data acquisition stage;
the first data acquisition stage performs data acquisition according to a first preset frequency, and the second data acquisition stage performs data acquisition according to a second preset frequency, wherein the first preset frequency is smaller than the second preset frequency.
Preferably, in the method for controlling fluxgate oscillation, step 1 further includes:
when the data fluctuation coefficient is not in the preset range, determining a first time node corresponding to the fluctuation mutation point in the current acquisition corresponding acquisition time, and obtaining a node segmentation rate corresponding to the first time node based on the position of the first time node in the acquisition time;
calculating the current acquired error time length based on the node segmentation rate and the fixed time length corresponding to the acquisition time;
meanwhile, a second time node of the fluctuation mutation point in the current unidirectional saturation period is determined, and a critical point of current change rate mutation is determined according to the error duration and the second time node;
and correcting the acquisition frequency of the coil current in the first data acquisition stage based on a third time node corresponding to the critical point.
Preferably, in a method for controlling fluxgate oscillation, determining a critical point of a change of a current change rate according to an error duration and a second time node includes:
predicting a mutation interval of coil current based on the error duration and a second time node;
acquiring a current variation image, determining the position of a previous unidirectional saturation node, which is consistent with the current direction of a coil corresponding to a current unidirectional saturation period, predicting the current variation image of the abrupt change interval based on the symmetry of a magnetic flux gate coil current curve, and judging a fluctuation abrupt change point as a critical point of abrupt change of the current variation rate when the predicted image is identical with an image corresponding to a recorded part of the abrupt change interval;
otherwise, determining a change point of the corresponding current change rate on the predicted image, and taking the change point as a critical point of abrupt change of the current change rate.
Preferably, in a method for controlling fluxgate oscillation, correcting the collection frequency of the coil current in the first data collection stage based on a third time node corresponding to the critical point includes:
acquiring a fourth time node corresponding to a previous unidirectional saturation node with the opposite coil current direction corresponding to the current unidirectional saturation period, and calculating to obtain a first phase duration corresponding to a first data acquisition phase based on the fourth time node and a third time node;
meanwhile, the corresponding repetition times and inherent time length of each acquisition are obtained, a single time interval is calculated, the time length of the first stage is corrected based on the single time interval, and the actual stage time length is obtained;
the method comprises the steps of obtaining data recording times of a first data acquisition stage of a plurality of unidirectional saturation periods, calculating to obtain average recording times, calculating to obtain correction frequency based on the average recording times and actual stage duration, and taking the correction frequency as a preset acquisition frequency of the first data acquisition stage.
Preferably, in the method for controlling fluxgate oscillation, the correction is performed on the acquisition frequency of the coil current in the first data acquisition stage, and the method further includes:
determining an acquisition end node corresponding to the first data acquisition stage based on the correction frequency, and calculating a waiting time interval between the acquisition end node and a third time node;
obtaining the predicted interval acquisition times based on the waiting time interval and the single time interval, and taking the critical point as a trigger point of the second data acquisition stage when the predicted interval acquisition times are smaller than or equal to a threshold value;
when the collection times of the prediction interval are larger than the threshold value, obtaining the product of the threshold value and the single time interval to obtain the prediction waiting time length, obtaining the prediction node based on the third time node corresponding to the critical point and the prediction waiting time length, and taking the position corresponding to the prediction node as a trigger point of the second data collection stage.
Compared with the prior art, the invention at least comprises the following beneficial effects:
the invention provides a control method for fluxgate oscillation, which adopts an ADC (Analog-to-Digital Converter ) to rapidly sample fluxgate coil current in a fluxgate design measurement range, judges whether a fluxgate reaches saturation or not by judging the change rate of the coil current, controls the current direction reversal of the fluxgate once the fluxgate is saturated in a certain direction, can keep good symmetry of a fluxgate coil current curve even when the measured current is not zero, reduces the subsequent signal processing difficulty, and simultaneously does not require the maximum current consumption of the fluxgate to reach a sensor to carry out current reversal, thereby reducing the power consumption of the fluxgate sensor.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of a method for controlling fluxgate oscillations according to the present invention;
FIG. 2 is a waveform diagram of a fluxgate coil of the present invention when the measured current is zero;
FIG. 3 is a waveform diagram of a measured current in a fluxgate coil of the present invention that is not zero;
FIG. 4 is a flowchart illustrating a method step 2 of controlling a fluxgate oscillation according to the present invention;
FIG. 5 is a flowchart illustrating a method for controlling fluxgate oscillations according to step 3 of the present invention;
fig. 6 is a flowchart of a method step 1 of controlling fluxgate oscillation according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, it being understood that the preferred embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Example 1:
the invention provides a control method of fluxgate oscillation, which is applied to a fluxgate current sensor, as shown in fig. 1, and comprises the following steps:
step 1: collecting real-time coil current of the fluxgate in a design measurement range of the fluxgate;
step 2: obtaining the current change rate of the coil current of the fluxgate based on the real-time coil current, and judging whether the fluxgate reaches a saturated state or not according to the current change rate;
step 3: when the fluxgate is judged to reach the saturation state, the direction of the coil current change of the fluxgate is controlled to be reversed.
In this embodiment, the saturation state includes saturation states in both the forward and reverse directions.
The beneficial effects of the technical scheme are that: according to the invention, ADC (Analog-to-Digital Converter) is adopted in a fluxgate design measurement range to rapidly sample fluxgate coil current, whether the fluxgate reaches saturation is judged by judging the change rate of the coil current, once the fluxgate is saturated in a certain direction, the direction reversal of the fluxgate current is controlled, and the waveform of the current in the fluxgate coil is shown in fig. 2-3, so that the current curve of the fluxgate coil can maintain good symmetry even when the measured current is not zero, the subsequent signal processing difficulty is reduced, meanwhile, the method does not require that the maximum current consumption of the fluxgate to reach the sensor is not required to be current reversal, and the power consumption of the fluxgate sensor is reduced.
Example 2:
on the basis of the above embodiment 1, step 2, as shown in fig. 3, includes:
step 201: generating a coil current change image based on the real-time coil current, acquiring the slope of each point on the coil current change image, and determining the current change rate corresponding to each time point according to the slope;
step 202: when the current change rate reaches a preset value, judging that the fluxgate reaches a saturated state, and executing the step 3;
step 203: and when the current change rate does not reach the preset value, judging that the fluxgate does not reach the saturation state, and executing the step 1.
In this embodiment, two preset values are set, one is the forward saturation change rate and the other is the reverse saturation change rate.
The beneficial effects of the technical scheme are that: according to the invention, based on the real-time coil current, a coil current change image is generated, the slope of each point on the coil current change image is obtained, the current change rate corresponding to each time point is determined according to the slope, and whether the fluxgate reaches a saturated state is judged according to the current change rate, so that the current reversal node can be rapidly determined under the condition that the symmetry of the fluxgate coil current image is ensured, and the subsequent current data processing is convenient.
Example 3:
on the basis of the above embodiment 1, step 3, as shown in fig. 4, includes:
step 301: when the fluxgate reaches a saturation state, a saturation signal is sent to the current control module;
step 302: and after the current control module receives the saturation signal, taking the current time point as a signal reversing node, and controlling the direction reversal of the coil current change direction of the fluxgate.
In this embodiment, the saturation signal is a control instruction for reversing a control current signal sent to a current control module when the fluxgate reaches a saturation state, where the current control module includes program software for controlling the fluxgate to perform current reversing.
In this embodiment, the signal inversion node refers to a time node at which the coil current of the fluxgate is inverted.
The beneficial effects of the technical scheme are that: when the fluxgate reaches a saturation state, the invention sends a saturation signal to the current control module, and after the current control module receives the saturation signal, the current time point is taken as a signal reversing node and the coil current generation direction of the fluxgate is controlled to be reversed, so that the current reversal can be completed even if the maximum current consumption of the fluxgate sensor is not reached, the power consumption of the fluxgate sensor is reduced, the duty ratio of the fluxgate self-excitation oscillation is kept at a relatively fixed value, and the measurement of the coil current is facilitated.
Example 4:
on the basis of the above embodiment 3, controlling the direction reversal of the coil current change direction of the fluxgate includes:
the coil exciting voltage is controlled to generate phase inversion, the phase inversion exciting voltage is loaded to two ends of the coil, and the direction of the current change of the coil is reversed
The beneficial effects of the technical scheme are that: the coil excitation voltage is controlled to generate phase inversion, the phase inversion excitation voltage flows through the coil, the direction of the coil current change is inverted, the current control module is ensured to quickly respond after receiving the saturation signal, and the quick response of the coil current change inversion is realized.
Example 5:
on the basis of embodiment 3 above, step 3 further includes:
and recording a time node for controlling the direction reversal of the coil current change direction of the fluxgate to generate a control operation log, and storing the control operation log.
The beneficial effects of the technical scheme are that: the invention records and stores the time node for controlling the inversion of the coil current generation direction of the fluxgate to generate the control operation log, thereby facilitating the user to check the direction conversion control of the fluxgate and knowing the self-excitation oscillation working process of the fluxgate in time.
Example 6:
on the basis of the above embodiment 1, step 1, as shown in fig. 5, includes:
step 101: collecting the current of a real-time coil of the fluxgate based on a preset collection strategy, repeatedly collecting the current for a plurality of times during each data collection in a first data collection stage, and calculating a data fluctuation coefficient of the repeated collection for a plurality of times;
step 102: when the data fluctuation coefficient is in a preset range, taking the average value of the data in the corresponding acquisition time acquired repeatedly for a plurality of times as the current acquired final real-time coil current;
step 103: when the fluctuation coefficient of the data is not in the preset range, determining a fluctuation mutation point, and carrying out weighted average on the data before the fluctuation mutation point to obtain the current acquired final real-time coil current;
step 104: taking the real-time coil current corresponding to the fluctuation mutation point as the final real-time coil current of new data acquisition, and triggering a second data acquisition stage;
the first data acquisition stage performs data acquisition according to a first preset frequency, and the second data acquisition stage performs data acquisition according to a second preset frequency, wherein the first preset frequency is smaller than the second preset frequency.
In this embodiment, the preset acquisition strategy includes two measurement phases, namely a first data acquisition phase and a second data acquisition phase, and the acquisition strategy of each unidirectional saturation period is the same. One complete saturation period includes two unidirectional saturation periods with opposite saturation directions.
In this embodiment, the first data acquisition stage refers to acquisition of fluxgate coil current according to a fixed acquisition frequency, and in this stage, uninterrupted data acquisition is performed multiple times (more than or equal to 3) for each acquisition, so that accuracy of coil current data acquisition is ensured while detection consumption is reduced, whether a coil current acquisition period is matched with actual change of coil current or not can be timely detected, a change position of a coil current change rate can be timely detected, and timeliness of determination of a saturation node is improved; the second data acquisition stage is to perform high-frequency dense data acquisition on the current of the fluxgate coil, so that the saturated node is ensured to be found in time.
In this embodiment, the data fluctuation coefficient refers to the fluctuation condition of the single-time collected data in the first data collection stage, and is specifically calculated as follows:
wherein ω represents the current acquired data fluctuation coefficient; n represents the total number of repeated sampling for the current sampling, and N is more than or equal to 3; n represents the acquisition times of no fluctuation in the current acquisition; x is x i Refers to the coil current value corresponding to the ith acquisition in the current acquisition.
In this embodiment, the final real-time coil current refers to the final data currently acquired for drawing the coil current variation image.
In this embodiment, the fluctuation abrupt point refers to a node at which the coil current change rate changes.
The beneficial effects of the technical scheme are that: the method comprises the steps of collecting real-time coil current of a fluxgate based on a preset collection strategy, dividing the collection of the coil current of each unidirectional saturation period into two stages, repeatedly collecting for a plurality of times during each data collection in a first data collection stage, calculating a data fluctuation coefficient of the repeatedly collected plurality of times, and judging whether fluctuation system data is in a preset range or not, reducing detection consumption and guaranteeing the accuracy of coil current data collection; when the data fluctuation coefficient is in a preset range, taking the average value of the data in the corresponding acquisition time of repeated acquisition for a plurality of times as the current acquired final real-time coil current, reducing the accidental of data acquisition and improving the data accuracy; when the fluctuation coefficient of the data is not in the preset range, determining a fluctuation mutation point, and carrying out weighted average on the data before the fluctuation mutation point to obtain the final real-time coil current acquired currently, thereby ensuring the effectiveness of the current acquisition; and the real-time coil current corresponding to the fluctuation mutation point is used as the final real-time coil current of new data acquisition, and the second data acquisition stage is triggered, so that the change position of the coil current change rate can be timely detected, the high-frequency concentration detection is timely triggered, and the timeliness of the determination of the saturation node is improved.
Example 7:
on the basis of embodiment 6 above, step 1 further includes:
when the data fluctuation coefficient is not in the preset range, determining a first time node corresponding to the fluctuation mutation point in the current acquisition corresponding acquisition time, and obtaining a node segmentation rate corresponding to the first time node based on the position of the first time node in the acquisition time;
calculating the current acquired error time length based on the node segmentation rate and the fixed time length corresponding to the acquisition time;
meanwhile, a second time node of the fluctuation mutation point in the current unidirectional saturation period is determined, and a critical point of current change rate mutation is determined according to the error duration and the second time node;
and correcting the acquisition frequency of the coil current in the first data acquisition stage based on a third time node corresponding to the critical point.
In this embodiment, the first time node refers to a time point of the fluctuation mutation point in the acquisition time corresponding to the current acquisition and multiple repeated acquisitions.
In this embodiment, the node segmentation rate refers to a representation value of a position of a first time node in an acquisition time, and specifically is calculated as follows:
assuming that the number of repeated acquisitions corresponding to the current acquisition is 4 and the fluctuation mutation node appears in the 3 rd data acquisition, the node segmentation rate is
In this embodiment, the fixed duration refers to the same acquisition time corresponding to each acquisition in the first data acquisition stage, and the repeated acquisition times are also the same.
In this embodiment, the error duration refers to the time that has been acquired before the fluctuation mutation point in the acquisition time:
wherein T is W Representing the error duration of current acquisition; t represents a fixed time length corresponding to each acquisition time in the first data acquisition stage;the node segmentation rate corresponding to the first time point is represented, and M represents the corresponding acquisition times of the first time node in the current acquisition.
In this embodiment, the second time node refers to a time point corresponding to the fluctuation mutation point in the current unidirectional saturation period.
In this embodiment, the critical point refers to a time node at which the coil current change rate changes.
In this embodiment, the third time node refers to a time corresponding to the current unidirectional saturation period of the critical point.
The beneficial effects of the technical scheme are that: when the data fluctuation coefficient is not in a preset range, determining a first time node corresponding to a fluctuation mutation point in the current acquisition corresponding acquisition time, and obtaining a node segmentation rate corresponding to the first time node based on the position of the first time node in the acquisition time; calculating the current acquired error time length based on the node segmentation rate and the fixed time length corresponding to the acquisition time; meanwhile, a second time node of the fluctuation mutation point in the current unidirectional saturation period is determined, and a critical point of current change rate mutation is determined according to the error duration and the second time node; and on the basis of a third time node corresponding to the critical point, correcting the acquisition frequency of the coil current in the first data acquisition stage, timely detecting whether the coil current acquisition period is matched with the actual change of the coil current, ensuring that the change rate of the coil current changes position in time when the coil current acquisition period and the coil current are not matched, ensuring the accuracy of coil current detection, and improving the timeliness of the determination of the saturation node.
Example 8:
on the basis of embodiment 7 above, determining the critical point of the change in the current change rate according to the error duration and the second time node includes:
predicting a mutation interval of coil current based on the error duration and a second time node;
acquiring a current variation image, determining the position of a previous unidirectional saturation node, which is consistent with the current direction of a coil corresponding to a current unidirectional saturation period, predicting the current variation image of the abrupt change interval based on the symmetry of a magnetic flux gate coil current curve, and judging a fluctuation abrupt change point as a critical point of abrupt change of the current variation rate when the predicted image is identical with an image corresponding to a recorded part of the abrupt change interval;
otherwise, determining a change point of the corresponding current change rate on the predicted image, and taking the change point as a critical point of abrupt change of the current change rate.
In this embodiment, the upper time limit of the abrupt change interval is the second time node, the lower time limit is the difference between the second time node and the error duration, and the error duration is the interval length.
In this embodiment, the predicted image is an image in which the current change image of the previous unidirectional saturation node whose coil current direction corresponds to the current unidirectional saturation period is mapped to the position corresponding to the abrupt region according to the symmetry of the fluxgate coil current curve.
In this embodiment, the recorded portion of the mutation area refers to an image that is already recorded and drawn according to the actual collected data on the mutation area.
In this embodiment, the change point refers to a node at which the current change rate on the predicted image changes.
The beneficial effects of the technical scheme are that: the method predicts the abrupt change interval of the coil current based on the error duration and the second time node, acquires the predicted image according to the image of the last unidirectional saturation node, which is consistent with the current direction of the coil corresponding to the current unidirectional saturation period, according to the symmetry of the current curve of the fluxgate coil, determines the critical point position according to the comparison of the predicted image and the image corresponding to the recorded part of the abrupt change interval, further confirms the beginning change position of the current change rate of the coil, provides a basis for the adjustment of the acquisition frequency of the first data acquisition stage, and ensures the timely triggering of the second data acquisition stage.
Example 9:
on the basis of embodiment 7, correcting the acquisition frequency of the coil current in the first data acquisition stage based on the third time node corresponding to the critical point includes:
acquiring a fourth time node corresponding to a previous unidirectional saturation node with the opposite coil current direction corresponding to the current unidirectional saturation period, and calculating to obtain a first phase duration corresponding to a first data acquisition phase based on the fourth time node and a third time node;
meanwhile, the corresponding repetition times and inherent time length of each acquisition are obtained, a single time interval is calculated, the time length of the first stage is corrected based on the single time interval, and the actual stage time length is obtained;
the method comprises the steps of obtaining data recording times of a first data acquisition stage of a plurality of unidirectional saturation periods, calculating to obtain average recording times, calculating to obtain correction frequency based on the average recording times and actual stage duration, and taking the correction frequency as a preset acquisition frequency of the first data acquisition stage.
In this embodiment, the fourth time node refers to a time point corresponding to a previous unidirectional saturation node having a direction opposite to a coil current corresponding to a current unidirectional saturation period.
In this embodiment, the first phase refers to a difference between the fourth time node and the third time node.
In this embodiment, the single time interval refers to a quotient obtained by dividing the inherent time period by the number of repetitions.
In this embodiment, the actual phase duration refers to the first phase duration minus the single time interval.
In this embodiment, the correction frequency refers to the acquisition frequency used for correcting the acquisition frequency of the coil current in the first data acquisition stage, and refers to the quotient of the actual stage duration and the average recording number.
The beneficial effects of the technical scheme are that: according to the method, according to the fourth time node corresponding to the last unidirectional saturation node with the opposite coil current direction corresponding to the current unidirectional saturation period, the first stage duration corresponding to the first data acquisition stage is calculated and obtained based on the fourth time node and the third time node; meanwhile, the corresponding repetition times and the inherent time length of each acquisition are obtained, a single time interval is calculated, the time length of the first stage is corrected based on the single time interval, the actual stage time length is obtained, and the data acquisition strategy transformation response time exists between the first data acquisition stage and the second data acquisition stage; the method comprises the steps of obtaining data recording times of a first data acquisition stage of a plurality of unidirectional saturation periods, calculating to obtain average recording times, calculating to obtain correction frequency based on the average recording times and actual stage duration, and adjusting the acquisition frequency by taking historical data as a basis, wherein the acquisition accuracy meets user requirements while the data acquisition consumption is saved.
Example 10:
on the basis of the above embodiment 9, the correction of the acquisition frequency of the coil current in the first data acquisition stage further includes:
determining an acquisition end node corresponding to the first data acquisition stage based on the correction frequency, and calculating a waiting time interval between the acquisition end node and a critical point;
obtaining the predicted interval acquisition times based on the waiting time interval and the single time interval, and taking the critical point as a trigger point of the second data acquisition stage when the predicted interval acquisition times are smaller than or equal to a threshold value;
when the collection times of the prediction interval are larger than the threshold value, obtaining the product of the threshold value and the single time interval to obtain the prediction waiting time length, obtaining the prediction node based on the third time node corresponding to the critical point and the prediction waiting time length, and taking the position corresponding to the prediction node as a trigger point of the second data collection stage.
In this embodiment, the acquisition end time point refers to the time when the last acquisition of the first data acquisition phase ends.
In this embodiment, each unidirectional saturation period has an independent time monitor, and when each unidirectional saturation period ends, the time monitor is cleared and timing is restarted.
In this embodiment, the waiting time interval refers to a difference between the acquisition end node and the third time node.
In this embodiment, the number of collection of the predicted interval refers to a quotient obtained by dividing the waiting time interval by the single time interval.
In this embodiment, the predicted waiting time period refers to a product of the threshold corresponding times and a single time interval.
In this embodiment, the predicted node refers to a time point obtained by subtracting the predicted waiting time from the third time node.
The beneficial effects of the technical scheme are that: the invention corrects the acquisition frequency of the coil current in the first data acquisition stage and simultaneously determines the triggering stage corresponding to the second data acquisition stage, thereby ensuring that the change point of the current change rate of each unidirectional saturation period can be found in time and the saturation node of the fluxgate can be accurately monitored. Determining an acquisition end node corresponding to the first data acquisition stage based on the correction frequency, and calculating a waiting time interval between the acquisition end node and a third time node; obtaining the collection times of the prediction interval based on the waiting time interval and the single time interval, and taking the critical point as the trigger point of the second data collection stage when the collection times of the prediction interval are smaller than or equal to a threshold value; when the collection times of the prediction interval is larger than the threshold value, obtaining the product of the threshold value and the single time interval to obtain the prediction waiting time, obtaining the prediction node based on the third time node corresponding to the critical point and the prediction waiting time, taking the position corresponding to the prediction node as the trigger point of the second data collection stage, ensuring that the time interval between the first data collection stage and the second data collection stage is kept within a certain range, namely providing sufficient response time for strategy transformation, and avoiding the problem of inaccurate current images caused by the interval time process.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. The control method of the fluxgate oscillation is applied to a fluxgate current sensor and is characterized by comprising the following steps of:
step 1: collecting real-time coil current of the fluxgate in a design measurement range of the fluxgate;
step 2: obtaining the current change rate of the coil current of the fluxgate based on the real-time coil current, and judging whether the fluxgate reaches a saturated state or not according to the current change rate;
step 3: when judging that the fluxgate reaches a saturated state, controlling the coil current change direction of the fluxgate to be reversed;
wherein, step 1 includes:
collecting the current of a real-time coil of the fluxgate based on a preset collection strategy, repeatedly collecting the current for a plurality of times during each data collection in a first data collection stage, and calculating a data fluctuation coefficient of the repeated collection for a plurality of times;
when the data fluctuation coefficient is in a preset range, taking the average value of the data in the corresponding acquisition time acquired repeatedly for a plurality of times as the current acquired final real-time coil current;
when the fluctuation coefficient of the data is not in the preset range, determining a fluctuation mutation point, and carrying out weighted average on the data before the fluctuation mutation point to obtain the current acquired final real-time coil current;
taking the real-time coil current corresponding to the fluctuation mutation point as the final real-time coil current of new data acquisition, and triggering a second data acquisition stage;
the first data acquisition stage performs data acquisition according to a first preset frequency, and the second data acquisition stage performs data acquisition according to a second preset frequency, wherein the first preset frequency is smaller than the second preset frequency;
step 1, further comprising:
when the data fluctuation coefficient is not in the preset range, determining a first time node corresponding to the fluctuation mutation point in the current acquisition corresponding acquisition time, and obtaining a node segmentation rate corresponding to the first time node based on the position of the first time node in the acquisition time;
calculating the current acquired error time length based on the node segmentation rate and the fixed time length corresponding to the acquisition time;
meanwhile, a second time node of the fluctuation mutation point in the current unidirectional saturation period is determined, and a critical point of current change rate mutation is determined according to the error duration and the second time node;
and correcting the acquisition frequency of the coil current in the first data acquisition stage based on a third time node corresponding to the critical point.
2. The method of claim 1, wherein step 2 comprises:
generating a coil current change image based on the real-time coil current, acquiring the slope of each point on the coil current change image, and determining the current change rate corresponding to each time point according to the slope;
when the current change rate reaches a preset value, judging that the fluxgate reaches a saturated state, and executing the step 3;
otherwise, judging that the magnetic flux gate does not reach saturation state, and executing the step 1.
3. The method of claim 1, wherein step 3 comprises:
when the fluxgate reaches a saturation state, a saturation signal is sent to the current control module;
and after the current control module receives the saturation signal, taking the current time point as a signal reversing node, and controlling the direction reversal of the coil current change direction of the fluxgate.
4. A method of controlling fluxgate oscillations according to claim 3, characterized in that controlling the direction reversal of the direction of the coil current change of the fluxgate comprises:
the coil excitation voltage is controlled to generate phase inversion, the phase inversion excitation voltage is applied to two ends of the coil, and the direction of the coil current change is inverted.
5. The method of claim 3, wherein step 3 further comprises:
and recording a time node for controlling the direction reversal of the coil current change direction of the fluxgate to generate a control operation log, and storing the control operation log.
6. The method of claim 1, wherein determining the critical point for the change in the current rate of change based on the error duration and the second time node comprises:
predicting a mutation interval of coil current based on the error duration and a second time node;
acquiring a current variation image, determining the position of a previous unidirectional saturation node, which is consistent with the current direction of a coil corresponding to a current unidirectional saturation period, predicting the current variation image of the abrupt change interval based on the symmetry of a magnetic flux gate coil current curve, and judging a fluctuation abrupt change point as a critical point of abrupt change of the current variation rate when the predicted image is identical with an image corresponding to a recorded part of the abrupt change interval;
otherwise, determining a change point of the corresponding current change rate on the predicted image, and taking the change point as a critical point of abrupt change of the current change rate.
7. The method of claim 1, wherein correcting the acquisition frequency of the coil current in the first data acquisition stage based on the third time node corresponding to the critical point comprises:
acquiring a fourth time node corresponding to a previous unidirectional saturation node with the opposite coil current direction corresponding to the current unidirectional saturation period, and calculating to obtain a first phase duration corresponding to a first data acquisition phase based on the fourth time node and a third time node;
meanwhile, the corresponding repetition times and inherent time length of each acquisition are obtained, a single time interval is calculated, the time length of the first stage is corrected based on the single time interval, and the actual stage time length is obtained;
the method comprises the steps of obtaining data recording times of a first data acquisition stage of a plurality of unidirectional saturation periods, calculating to obtain average recording times, calculating to obtain correction frequency based on the average recording times and actual stage duration, and taking the correction frequency as a preset acquisition frequency of the first data acquisition stage.
8. The method of claim 7, wherein correcting the acquisition frequency of the coil current in the first data acquisition phase further comprises:
determining an acquisition end node corresponding to the first data acquisition stage based on the correction frequency, and calculating a waiting time interval between the acquisition end node and a third time node;
obtaining the predicted interval acquisition times based on the waiting time interval and the single time interval, and taking the critical point as a trigger point of the second data acquisition stage when the predicted interval acquisition times are smaller than or equal to a threshold value;
when the collection times of the prediction interval are larger than the threshold value, obtaining the product of the threshold value and the single time interval to obtain the prediction waiting time length, obtaining the prediction node based on the third time node corresponding to the critical point and the prediction waiting time length, and taking the position corresponding to the prediction node as a trigger point of the second data collection stage.
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