CN218099351U - Detection signal reconstruction system and circuit - Google Patents
Detection signal reconstruction system and circuit Download PDFInfo
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- CN218099351U CN218099351U CN202221933596.7U CN202221933596U CN218099351U CN 218099351 U CN218099351 U CN 218099351U CN 202221933596 U CN202221933596 U CN 202221933596U CN 218099351 U CN218099351 U CN 218099351U
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Abstract
The utility model discloses a detection signal reconstruction system, which comprises a processing module, a comprehensive node, a PID control module and a model module; the original signal output by the external sensor is connected into the processing module, the comprehensive node receives the transmission value of the processing module and the model module, the output data of the comprehensive node is transmitted to the PID control module, and the output data of the PID control module is transmitted to the model module; and the processing result of the PID control module is output as a reconstructed original signal. The utility model also provides a detection signal reconstruction circuit. Compared with the prior art, the utility model discloses detection signal reconstruction system and reconstruction circuit that provide in the middle of do not use the signal sampling of high bandwidth, condition the device, on keeping the basis that traditional low-cost low bandwidth signal sampling was taked care of the structure, the signal of going back as far as possible, reconsitution play and original signal are pressed close to effectively promote current converter control high speed motor or super high speed motor's ability.
Description
Technical Field
The utility model belongs to the technical field of detect, in particular to current detection signal reconstruction system in converter.
Background
The motor is generally driven and controlled by a power electronic frequency conversion device. When a traditional power electronic frequency conversion device such as a frequency converter is connected with a motor, in order to ensure the operation effect of the motor, a detection point is usually required to be arranged at the designated position of the frequency converter, a corresponding current conditioning circuit is arranged at the detection point to detect the current value of the point, and front-end detection data is provided for monitoring the working condition of the frequency converter and the operation condition of the motor, so as to further realize the real-time data provision for the working control of the frequency converter and the operation control of the motor.
In the frequency converter provided in the prior art, the driving object at the beginning of the design is often a medium-low speed motor, the highest alternating frequency of the alternating current output by the frequency converter is often in the range of 600 to 800Hz or even lower frequency, and in order to adapt to the alternating frequency output by the frequency converter, the selection of devices in the current conditioning circuit is often correspondingly adjusted accordingly: for example, a current sensor more sensitive to the medium-low frequency alternating current is selected in the current conditioning circuit, and a filter with the central frequency point matched with the alternating frequency of the alternating current output by the frequency converter is selected, so that the current conditioning circuit has a low bandwidth, can be matched with the medium-low speed motor and the frequency converter for driving the medium-low speed motor, and detects a current signal with high accuracy by using low circuit noise.
In recent years, along with popularization of energy conservation and emission reduction concepts, application of high-speed motors, particularly high-power high-speed and ultrahigh-speed motors, is more and more popularized. When a high-power high-speed and ultrahigh-speed motor runs, a frequency converter capable of outputting high-frequency and ultrahigh-frequency alternating current is necessarily required to be arranged corresponding to the motor. For a frequency converter capable of outputting high-frequency and ultrahigh-frequency alternating current, if a current conditioning circuit of the original adaptive low-frequency converter is still adopted, the current conditioning circuit of the original adaptive low-frequency converter has larger phase attenuation and phase delay on high-frequency fundamental wave current, and the reliability of a detection result is poorer; if the composition of the current conditioning circuit is modified aiming at the frequency converter capable of outputting high-frequency and ultrahigh-frequency alternating current, the current sensor sensitive to the high-frequency alternating current and the filter with the higher central frequency point are selected to form the current conditioning circuit with the higher bandwidth, the high bandwidth of the current conditioning circuit brings non-negligible noise to a detection result, and due to the fact that the devices with high signal-to-noise ratio and high bandwidth are high in manufacturing cost and not easy to obtain, the circuit cost and the manufacturing difficulty of the reset current conditioning circuit are greatly improved, and the reset current conditioning circuit is difficult to apply in an actual motor control scene.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, an object of the utility model is to provide a detection signal reconfiguration system, this system architecture is succinct, realize convenient, with low costs for in the scene that converter and high-speed motor drive are connected, can reconstruct more accurate detection signal, provide more accurate detection data for motor control and operation.
Another object of the utility model is to provide a detection signal reconstruction circuit, this circuit is being connected with the motor not destroying original converter, adopt the sensor and conditioning circuit to obtain under the prerequisite of assigned position department detected signal, through addding the model circuit, comparison circuit and signal reconstruction PI control circuit, simulate original conditioning circuit to the influence of sensor signal and compensate this influence, rebuild more reliably with hardware circuit's form, more accurate signal, low-cost locally provides the higher decision basis of credibility for motor control operation, this circuit is used and is connected at converter and high-speed or hypervelocity motor, when converter output high frequency alternating current drive motor moves the scene, can effectively deal with original signal detection process to the influence of original signal, guarantee that high speed motor or hypervelocity motor are stable, controlled operation reliably.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a detection signal reconstruction system, the detection signal reconstruction system comprising:
the processing module has fixed transfer characteristics and is used for carrying out data processing on the original signal;
the system also includes a synthetic node for calculating the deviation;
a PID control module for following the deviation and reconstructing a reconstructed signal close to the original signal according to the deviation;
and a model module having transfer characteristics identical or similar to those of the processing module for simulating the influence of the processing module on the original signal;
the original signal output by the external sensor is connected into the processing module, the comprehensive node receives the transmission value of the processing module and the model module, the output data of the comprehensive node is transmitted to the PID control module, and the output data of the PID control module is transmitted to the model module; and the processing result of the PID control module is output as a reconstructed original signal.
The frequency converter is used as a power conversion device, and generally comprises a rectifying circuit, a filter circuit, a chopper circuit, an inverter circuit and the like in the frequency converter; after external power frequency commercial power is connected into a frequency converter, the commercial power is converted into alternating current with certain voltage U and certain alternating frequency f through the steps of rectification, filtering, chopping, inversion and the like, the alternating current is connected into a motor, and the rotating speed of the motor is adjusted
It can be clearly known that the running condition and the rotating speed change of the motor are directly related to the alternating current output by the frequency converter, and if the rotating speed change of the motor needs to be controlled or the running condition of the motor needs to be changed as required, a reasonable means is needed to obtain the alternating frequency, the alternating current voltage amplitude and the real-time numerical values of other specified physical quantities of the alternating current output by the frequency converter.
In general, the original signal output by the external sensor is weak and has low signal-to-noise ratio, and the corresponding data processing must be performed on the original signal, so that the data suitable for subsequent analysis or execution can be obtained after the amplitude of the original signal is amplified, the noise in the original signal is filtered, and the signal-to-noise ratio of the original signal is improved. In order to avoid the system error introduced by the data processing process for the original signal, the utility model provides a technical scheme in additionally set up the model module, this model module is based on the observer principle, and is constructed with the transmission characteristic similar to processing module, on one hand, the original signal of external sensor output inserts to processing module, synthesizes node and receives the value of passing of processing module and model module, synthesizes the output data of node and sends to PID control module, PID control module's processing result is as the original signal output of reconsitution; on the other hand, the output data of the PID control module is transmitted to the model module; the model module simulates the effect of the original signal influenced by the processing module in the data processing process, and provides a deviation basis for the original signal reconstruction of the PID control module.
When the technical scheme is implemented specifically, the system structure that the original frequency converter is connected with the motor and the processing module is adopted to perform data processing on the original signal to obtain the designated physical quantity signal at the designated position is not damaged, but on the basis of the original system structure, the model module is additionally arranged to simulate the influence of the processing module on the signal, compensate the signal according to the real-time deviation value, reconstruct a reconstructed signal which is closer to and more accurate than the original signal, and provide a more real decision basis for motor control.
Furthermore, the PID control module is one or a combination of more of a P unit, an I unit and a D unit. In the implementation, a person skilled in the art can select to form the P controller by a single P unit or to form the PI controller by combining the P unit and the I unit according to the specific application scenario and the device parameters.
Further, the Z-domain discretization transfer function of the system is as follows:
wherein a is 0 、a 1 、a 2 、b 0 、b 1 、b 2 Are all adjustable parameters. The utility model provides a technical scheme is at concrete implementation in-process, and wherein single module such as processing module, comprehensive node, PID control module and model module can specifically adopt the hardware circuit that has corresponding input/output relation, have the calculator that corresponds the algorithm, have the complete set data processing program of unanimous data processing method to realize one by oneAfter the single module is realized, the system formed by constructing the biographical relation recorded by the technical scheme provided by the utility model, wherein a 0 、a 1 、a 2 、b 0 、b 1 、b 2 In the specific implementation, a person skilled in the art may correspondingly adjust specific electronic component parameters in each hardware circuit, specific node coefficients in each calculator, specific variable parameters in each data processing program, and the like, an internal structure of a single module, an implementation manner thereof, an implementation principle thereof, and the like according to specific situations, which are not the core claimed in the present application.
The utility model also provides a detection signal reconstruction circuit, this circuit including:
the conditioning circuit is used for receiving the original signal detected by the external sensor, further processing the signal of the external sensor, filtering and outputting the signal to be a conditioning signal;
the model circuit is used for simulating the influence of the conditioning circuit on the original signal and outputting a model signal;
the comparison circuit is used for comparing the conditioning signal with the model signal and calculating the amplitude difference and the phase difference of the conditioning signal and the model signal;
and a signal reconstruction PI control circuit for reconstructing a reconstructed signal that is close to the original signal in amplitude and phase according to a comparison result between the conditioned signal and the model signal;
an original signal output by the external sensor is connected to the model circuit, the output end of the model circuit is connected to the positive feedback end of the comparison circuit, the output end of the comparison circuit is connected to the signal reconstruction PI control circuit, the output end of the signal reconstruction PI control circuit is connected to the model circuit, and the output end of the model circuit is connected to the negative feedback end of the comparison circuit.
As described above, in the frequency converter provided in the prior art, a driving object at the beginning of design is often a medium-low speed motor, an alternating frequency of an alternating current output by such a frequency converter is often in a frequency range of 0 to 800Hz or even lower, and a conditioning circuit correspondingly arranged to the frequency range often has characteristics of a center frequency point close to the frequency range, a low bandwidth, low-pass filtering, and the like. However, with the economic and technical development, the required rotating speed of the motor is increasingly greater, a high-speed motor or even an ultra-high-speed motor gradually appears in the market, a corresponding frequency converter must correspondingly provide high-frequency or even ultra-high-frequency alternating current to correspondingly drive the motor to operate, in this scene, the alternating frequency of an original signal detected by an external sensor is inevitably increased along with the increase of the working frequency of the frequency converter, an original conditioning circuit with the characteristics of lower central frequency point, lower bandwidth, low-pass filtering and the like is difficult to be qualified for a conditioning task at this time, because the frequency point of the original detection circuit is lower and is far from the fundamental frequency of the original signal, after the original signal passes through the conditioning circuit, the high-frequency component is influenced by the circuit to have obvious amplitude attenuation and phase delay, when the conditioning circuit with the characteristic of low-pass filtering is used for processing the high-frequency original signal, inevitable exists, if measures are not correspondingly taken, after the original signal becomes a conditioning signal, the amplitude and the phase of the conditioning circuit are greatly distorted, a back-stage circuit is difficult to directly use the conditioning signal to accurately control the operation of the motor, and the stability of the high-speed motor or the ultra-speed motor during operation is greatly reduced.
Therefore, the application provides a detection signal reconstruction circuit, which utilizes the observer design principle, does not destroy the original conditioning circuit with low-pass filtering characteristic, but researches the input and output characteristics in advance, constructs a model circuit with input and output characteristics similar to the input and output characteristics and applies the model circuit to the detection signal reconstruction circuit, reconstructs a signal after passing through a signal reconstruction PI control circuit by utilizing the difference value of output signals of the model circuit and the conditioning circuit, so that the attenuated amplitude and the delayed phase of an original signal after passing through the conditioning signal can be compensated, and finally a reconstructed signal which is closer to the original signal in the relation of the amplitude and the phase is obtained, so that a signal with higher reliability can be obtained on the premise of not changing the original joint structure of a frequency converter and a motor and the hardware setting and structure of an external sensor and the conditioning circuit, and the signal can be taken by a rear-stage controller or a rear-stage actuator to drive a high-speed or ultra-high-speed motor, thereby helping the high-speed or the ultra-speed motor to be controlled to start and stop and stably run.
Further, the transfer function of the S domain of the circuit is:
wherein, a' is 0 、a 1 `、a` 2 、b` 0 、b 1 `、b` 2 Are all adjustable parameters.
Furthermore, the conditioning circuit comprises a detection signal processor and a low-pass filter, wherein the input end of the detection signal processor is connected with an original signal output by an external sensor, the output end of the detection signal processor is connected with the low-pass filter, and the output end of the low-pass filter is connected with the positive feedback end of the comparison circuit.
Furthermore, the model circuit comprises a first resistor and a first capacitor, wherein one end of the first resistor is connected with the output end of the signal reconstruction PI control circuit, the other end of the first resistor is connected with one end of the first capacitor, the other end of the first capacitor is grounded, and the common end of the first resistor and the first capacitor is connected with the comparison circuit. It should be emphasized that, in order to simulate the transfer characteristic of the conventional conditioning circuit in the prior art, the model circuit is constructed in the form of the RC low-pass filter in the present application, so that the transfer characteristic of the conventional conditioning circuit in the prior art can be fitted to the maximum extent. In practical implementation, the specific hardware structure of the model circuit should be set corresponding to the actual conditioning circuit.
Furthermore, the comparison circuit comprises a first operational amplifier and a second resistor; the output end of the low-pass filter is connected with the positive phase input end of the first operational amplifier, one end of the second resistor is connected with the negative phase input end of the first operational amplifier, and the other end of the second resistor is connected with the output end of the first operational amplifier; the common end of the first resistor and the first capacitor is connected to the inverting input end of the first operational amplifier.
Further, the signal reconstruction PI control circuit comprises a second operational amplifier, a third resistor and a second capacitor; the positive phase input end of the second operational amplifier is grounded, the negative phase input end of the second operational amplifier is connected with the output end of the first operational amplifier, one end of the third resistor is connected with the negative phase input end of the second operational amplifier, the other end of the third resistor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with the output end of the second operational amplifier.
When the detection signal reconstruction circuit is applied to practice, the following method is adopted for working:
s1: signal acquisition: setting a corresponding sensor for the specified physical quantity to be detected at the specified position, detecting the specified physical quantity at the position through the sensor, and acquiring the output data of the sensor as an original signal;
s2: signal conditioning: performing signal conditioning on the original signal to obtain a conditioning signal matched with a rear-stage controller or a rear-stage actuator;
s3: signal reconstruction: and after the attenuation and delay of the modulation signal are compensated by the influence of the analog signal conditioning process on the original signal, reconstructing to generate a reconstructed signal closer to the original signal, and supplying the reconstructed signal to a rear-stage controller or a rear-stage actuator.
The utility model has the advantages that: compared with the prior art, the utility model discloses detection signal reconstruction system, reconstruction circuit and reconstruction method that provide in the middle of do not use the signal sampling of high bandwidth, condition the device, on keeping the basis that traditional low-cost low bandwidth signal sampling was taked care of the structure, restore as far as possible, reconstruct the signal of going close to with original signal, effectively promote the ability of current converter control high speed motor or hypervelocity motor.
Drawings
Fig. 1 is a system block diagram of a detection signal reconstruction system provided in the first embodiment, where S is an external sensor and J is a synthetic node.
Fig. 2 is a schematic circuit configuration diagram of the detection signal reconstruction circuit provided in the second embodiment. Where S is an external sensor.
Fig. 3 is a waveform diagram of the original signal i-sensor, the conditioned signal i-filtered, and the reconstructed signal i-estimated in the detection signal reconstruction circuit provided in the second embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
the first embodiment is as follows:
please refer to fig. 1.
In one embodiment, a detection signal reconstruction system includes:
the processing module has fixed transfer characteristics and is used for carrying out data processing on the original signal D-sensor;
the system also includes a composite node J for calculating the deviation;
a PID control module for following the deviation and reconstructing a reconstructed signal D-interested close to the original signal D-sensor according to the deviation;
and a model module having transfer characteristics consistent with the processing module for simulating the influence of the processing module on the original signal D-sensor;
an original signal D-sensor output by an external sensor is connected into a processing module, a comprehensive node J receives transmission values of the processing module and a model module, output data of the comprehensive node J is transmitted to a PID control module, and output data of the PID control module is transmitted to the model module; and outputting a processing result of the PID control module as a reconstructed original signal D-sensor.
Further, in the present embodiment, the PID control module is a PI controller formed by coupling a P unit and an I unit.
Further, in this embodiment, the Z-domain discretization transfer function of the system is:
wherein a is 0 、a 1 、a 2 、b 0 、b 1 、b 2 Are all adjustable parameters.
The detection signal reconstruction system works according to the following detection signal reconstruction method when being applied specifically, and the method comprises the following steps:
s1: signal acquisition: setting a corresponding sensor for the specified physical quantity to be detected at the specified position, detecting the specified physical quantity at the position through the sensor, and acquiring the output data of the sensor as an original signal D-sensor;
s2: signal conditioning: performing signal conditioning on the original signal D-sensor to obtain a conditioning signal matched with a rear-stage controller or a rear-stage actuator;
s3: signal reconstruction: and simulating the influence of the signal conditioning process on the original signal D-sensor, reconstructing to generate a reconstructed signal D-affected closer to the original signal D-sensor after compensating the attenuation amount and the delay amount of the conditioning signal, and supplying the reconstructed signal D-affected to a rear-stage controller or a rear-stage actuator.
The second embodiment is as follows:
please refer to fig. 2-3.
In this embodiment, a detection signal reconstruction circuit is provided, which includes:
the conditioning circuit is used for receiving an original signal i-sensor detected by an external sensor, further processing the signal of the external sensor, filtering and outputting the signal to be a conditioned signal i-filtered;
the model circuit is used for simulating the influence of the conditioning circuit on the original signal i-sensor and outputting a model signal i-feedback;
the comparison circuit is used for comparing the conditioning signal i-filtered and the model signal i-feedback and calculating the amplitude difference and the phase difference of the conditioning signal i-filtered and the model signal i-feedback;
and a signal reconstruction PI control circuit for reconstructing a reconstructed signal i-estimated which is close to the original signal i-sensor in amplitude and phase according to the comparison result between the conditioning signal i-filtered and the model signal i-feedback;
an original signal i-sensor output by an external sensor is connected into a model circuit, the output end of the model circuit is connected with the positive feedback end of a comparison circuit, the output end of the comparison circuit is connected with a signal reconstruction PI control circuit, the output end of the signal reconstruction PI control circuit is connected into the model circuit, and the output end of the model circuit is connected with the negative feedback end of the comparison circuit.
Further, in this embodiment, the transfer function of the domain S of the circuit is:
wherein, a' is 0 、a 1 `、a` 2 、b` 0 、b 1 `、b` 2 Are all adjustable parameters.
Further, in this embodiment, the conditioning circuit includes a detection signal processor and a low pass filter, an input end of the detection signal processor is connected to the original signal i-sensor output by the external sensor, an output end of the detection signal processor is connected to the low pass filter, and an output end of the low pass filter is connected to the positive feedback end of the comparison circuit.
Further, in this embodiment, the model circuit includes a first resistor R1 and a first capacitor C1, one end of the first resistor R1 is connected to the output end of the signal reconstruction PI control circuit, the other end of the first resistor R1 is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is grounded, and a common end of the first resistor R1 and the first capacitor C1 is connected to the comparison circuit. It should be emphasized that, in order to simulate the transfer characteristic of the conventional conditioning circuit in the prior art, in the present embodiment, the model circuit is constructed in the form of an RC low-pass filter, so that the transfer characteristic of the conventional conditioning circuit in the prior art can be fitted to the maximum extent. In practical implementation, the specific hardware structure of the model circuit should be set corresponding to the actual conditioning circuit.
Further, in this embodiment, the comparison circuit includes a first operational amplifier Q1 and a second resistor; the output end of the low-pass filter is connected with the positive phase input end of the first operational amplifier Q1, one end of the second resistor is connected with the negative phase input end of the first operational amplifier Q1, and the other end of the second resistor is connected with the output end of the first operational amplifier Q1; the common end of the first resistor R1 and the first capacitor C1 is connected to the inverting input end of the first operational amplifier Q1.
Further, in this embodiment, the signal reconstruction PI control circuit includes a first operational amplifier Q2, a third resistor R3, and a second capacitor C2; the non-inverting input end of the first operational amplifier Q2 is grounded, the inverting input end of the first operational amplifier Q1 is connected with the output end of the first operational amplifier Q1, one end of a third resistor R3 is connected with the inverting input end of the first operational amplifier Q2, the other end of the third resistor R3 is connected with one end of a second capacitor C2, and the other end of the second capacitor C2 is connected with the output end of the first operational amplifier Q2.
In a specific application, the detection signal reconstruction circuit operates according to the following detection signal reconstruction method:
s1: signal acquisition: setting a corresponding sensor for a specified physical quantity to be detected at a specified position, detecting the specified physical quantity at the position through the sensor to obtain the size of the specified physical quantity at the position, and acquiring sensor output data as an original signal i-sensor;
s2: signal conditioning: performing signal conditioning on the original signal i-sensor to obtain a conditioned signal i-filtered matched with a rear-stage controller or a rear-stage actuator;
s3: signal reconstruction: and simulating the influence of the signal conditioning process on the original signal i-sensor, reconstructing a reconstructed signal i-affected which is closer to the original signal i-sensor after compensating the attenuation amount and the delay amount of the conditioning signal i-filtered, and supplying the reconstructed signal i-affected to a rear-stage controller or a rear-stage actuator.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A detection signal reconstruction system, the detection signal reconstruction system comprising:
the processing module has fixed transfer characteristics and is used for carrying out data processing on the original signal;
the system is characterized by also comprising a comprehensive node for calculating deviation;
a PID control module for following the deviation and reconstructing a reconstructed signal close to the original signal according to the deviation;
and a model module for simulating the effect of the processing module on the original signal;
external original signals are input into the processing module, the comprehensive node receives the transmission value of the processing module and the model module, the output data of the comprehensive node is transmitted to the PID control module, and the output data of the PID control module is transmitted to the model module;
and the processing result of the PID control module is output as a reconstructed original signal.
2. The system for reconstructing a detection signal according to claim 1, wherein the PID control module is one or a combination of P unit, I unit and D unit.
3. The detection signal reconstruction system of claim 2, wherein the Z-domain discretization transfer function of the system is:
wherein a is 0 、a 1 、a 2 、b 0 、b 1 、b 2 Are all adjustable parameters.
4. A detection signal reconstruction circuit, comprising:
the conditioning circuit is used for receiving the original signal detected by the external sensor, further processing the signal of the external sensor, filtering and outputting the signal to be a conditioning signal;
the circuit is characterized by also comprising a model circuit for simulating the influence of the conditioning circuit on an original signal and outputting a model signal;
the comparison circuit is used for comparing the conditioning signal with the model signal and calculating the amplitude difference and the phase difference of the conditioning signal and the model signal;
and a signal reconstruction PI control circuit for reconstructing a reconstructed signal that is close to the original signal in amplitude and phase according to a comparison result between the conditioned signal and the model signal;
the output end of the signal reconstruction PI control circuit is connected with the model circuit, and the output end of the model circuit is connected with the negative feedback end of the comparison circuit.
5. The detection signal reconstruction circuit of claim 4, wherein the transfer function of the S domain of the circuit is:
wherein, a' is 0 、a 1 `、a` 2 、b` 0 、b 1 `、b` 2 Are all adjustable parameters.
6. The detection signal reconstruction circuit of claim 5, wherein the conditioning circuit comprises a detection signal processor and a low pass filter, an input terminal of the detection signal processor is connected to an original signal output by the external sensor, an output terminal of the detection signal processor is connected to the low pass filter, and an output terminal of the low pass filter is connected to a positive feedback terminal of the comparison circuit.
7. The detection signal reconstruction circuit according to claim 6, wherein the model circuit includes a first resistor and a first capacitor, one end of the first resistor is connected to the output terminal of the signal reconstruction PI control circuit, the other end of the first resistor is connected to one end of the first capacitor, the other end of the first capacitor is grounded, and a common terminal of the first resistor and the first capacitor is connected to the comparison circuit.
8. The detection signal reconstruction circuit of claim 7, wherein the comparison circuit includes a first operational amplifier and a second resistor; the output end of the low-pass filter is connected with the positive input end of the first operational amplifier, one end of the second resistor is connected with the negative input end of the first operational amplifier, and the other end of the second resistor is connected with the output end of the first operational amplifier; and the common end of the first resistor and the first capacitor is connected to the inverting input end of the first operational amplifier.
9. The detection signal reconstruction circuit of claim 8, wherein the signal reconstruction PI control circuit includes a second operational amplifier, a third resistor, and a second capacitor; the positive phase input end of the second operational amplifier is grounded, the negative phase input end of the second operational amplifier is connected with the output end of the first operational amplifier, one end of the third resistor is connected with the negative phase input end of the second operational amplifier, the other end of the third resistor is connected with one end of the second capacitor, and the other end of the second capacitor is connected with the output end of the second operational amplifier.
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