CN106773786B - RVDT signal simulation circuit, method and device - Google Patents

RVDT signal simulation circuit, method and device Download PDF

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Publication number
CN106773786B
CN106773786B CN201611226577.XA CN201611226577A CN106773786B CN 106773786 B CN106773786 B CN 106773786B CN 201611226577 A CN201611226577 A CN 201611226577A CN 106773786 B CN106773786 B CN 106773786B
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signal
digital
differential signal
circuit
rvdt
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CN106773786A (en
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何海燕
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Beijing Runke General Technology Co Ltd
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Beijing Runke General Technology Co Ltd
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B17/00Systems involving the use of models or simulators of said systems
    • G05B17/02Systems involving the use of models or simulators of said systems electric

Abstract

The invention provides an RVDT signal simulation circuit, a method and a device. The circuit includes: the signal acquisition circuit, the controller and the signal output circuit; the signal acquisition circuit is used for acquiring an analog excitation signal input by a sensor primary coil of the RVDT, converting the analog excitation signal into a digital excitation signal and transmitting the digital excitation signal to the controller; the controller is used for determining the current wiring mode of the RVDT, determining the functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal from the preset functional relation between the differential signal corresponding to each wiring mode of the RVDT and the excitation signal, calculating the digital differential signal corresponding to the digital excitation signal according to the determined functional relation, and transmitting the digital differential signal to the signal output circuit; the signal output circuit is used for converting the digital differential signal into an analog differential signal. The invention can be compatible with the signal simulation of the RVDT with different wiring modes in a convenient mode at lower cost.

Description

RVDT signal simulation circuit, method and device
Technical Field
The invention relates to the technical field of signal simulation, in particular to an RVDT (Rotary variable differential Transformer) signal simulation circuit, method and device.
Background
The RVDT can convert mechanical displacement signals into electrical signals for output; the RVDT can be applied to transmission and feedback control of ball valve positions, hydraulic pumps, forklifts, robots, fans and other equipment, and particularly has wide application in spacecrafts such as airplanes and the like. Therefore, the simulation of the RVDT signals is of great significance, particularly in the application of spacecrafts such as airplanes and the like, the simulation of the RVDT signals can simulate real RVDT sensor signals in an airborne system so as to verify the correctness of ground test equipment and assist the ground debugging of the airborne system of the airplane.
The RVDT signal simulation mainly simulates the electrical characteristics of the RVDT, and the main aspect of the simulation is that when the sensor primary coil of the RVDT receives the excitation signal input, the sensor secondary coil of the RVDT simulates the output of a differential signal corresponding to the excitation signal.
Currently, RVDT signal simulation is realized mainly through the combination of simulation hardware circuits such as a multiplier, an adder, a subtracter and the like; the wiring modes of the RVDT are various (such as two-wire system, three-wire system, four-wire system and the like), the RVDTs of different wiring modes have different functional relations of differential signals of analog output relative to input excitation signals, and one group of simulation hardware circuits can only realize the signal simulation of the RVDT in one wiring mode and cannot realize the signal simulation of the RVDTs of various wiring modes in one group of simulation hardware circuits; in order to realize signal simulation of RVDTs in multiple wiring modes, corresponding simulation hardware circuits need to be respectively set for RVDTs in different wiring modes, which causes higher simulation cost and more complicated simulation implementation. Therefore, how to be compatible with the signal simulation of the RVDTs of different wiring modes in a low-cost and convenient manner becomes a problem to be considered by those skilled in the art.
Disclosure of Invention
In view of this, embodiments of the present invention provide an RVDT signal simulation circuit, method and apparatus, which achieve the purpose of being compatible with RVDT signal simulations of different wiring modes in a low cost and convenient manner.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
an RVDT signal simulation circuit comprising: the signal acquisition circuit, the controller and the signal output circuit;
the signal acquisition circuit is used for acquiring an analog excitation signal input by a sensor primary coil of the RVDT, converting the analog excitation signal into a digital excitation signal and transmitting the converted digital excitation signal to the controller;
the controller is used for determining the current wiring mode of the RVDT, determining the functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal from the preset functional relation between the differential signal corresponding to each wiring mode of the RVDT and the excitation signal, calculating the digital differential signal corresponding to the digital excitation signal according to the determined functional relation, and transmitting the determined digital differential signal to the signal output circuit;
the signal output circuit is used for converting the digital differential signal into an analog differential signal.
Optionally, the functional relationship between the differential signal and the excitation signal indicates a functional relationship that the frequency of the differential signal is the same as that of the excitation signal, and the amplitude of the differential signal changes with the angular displacement; the controller is configured to calculate a digital differential signal corresponding to the digital excitation signal according to the determined functional relationship, and specifically includes:
analyzing the digital excitation signal, and determining the amplitude and the frequency of the digital excitation signal;
determining a current angular displacement;
and determining a digital differential signal corresponding to the amplitude, the frequency and the current angular displacement according to the determined functional relation.
Optionally, the controller is configured to determine, according to the determined functional relationship, a digital differential signal corresponding to the amplitude, the frequency, and the current angular displacement, and specifically includes:
acquiring a predefined transformer ratio of a sensor secondary coil and a sensor primary coil of the RVDT and a set angular displacement range upper limit value;
and substituting the amplitude, the frequency, the current angular displacement, the transformation ratio and the angular displacement range upper limit value into the determined functional relation to calculate the digital differential signal.
Optionally, the signal acquisition circuit includes: the first program control signal conditioning circuit and the first analog-to-digital conversion circuit;
the first program-controlled signal conditioning circuit is used for expanding the acquisition amplitude range of the analog excitation signal of the primary coil of the input sensor under the control of the controller;
the first analog-to-digital conversion circuit is used for carrying out analog-to-digital conversion on the analog excitation signal which is processed by the first program control signal conditioning circuit and is used for expanding the acquisition amplitude range under the control of the controller and transmitting the converted digital excitation signal to the controller;
the signal output circuit includes: the first double-channel digital-to-analog conversion circuit, the first double-channel filter circuit, the first double-channel power amplification circuit, the second double-channel digital-to-analog conversion circuit, the second double-channel filter circuit and the second double-channel power amplification circuit;
the first double-channel digital-to-analog conversion circuit is used for respectively carrying out digital-to-analog conversion processing on the digital differential signals of the high channel and the low channel at one end output by the controller;
the first dual-channel filter circuit is used for respectively filtering the analog differential signals of the high channel and the low channel converted by the first dual-channel digital-to-analog conversion circuit;
the first dual-path power amplifying circuit is used for respectively performing power amplification processing on the analog differential signals of the high channel and the low channel filtered by the first dual-path filter circuit;
the second double-channel digital-to-analog conversion circuit is used for respectively carrying out digital-to-analog conversion processing on the digital differential signals of the high channel and the low channel at the other end output by the controller;
the second dual-channel filter circuit is used for respectively filtering the analog differential signals of the high channel and the low channel converted by the second dual-channel digital-to-analog conversion circuit;
the second dual-path power amplifying circuit is used for respectively performing power amplification processing on the analog differential signals of the high channel and the low channel filtered by the second dual-path filter circuit.
Optionally, the RVDT signal simulation circuit further includes: a differential signal acquisition circuit;
the differential signal acquisition circuit is used for acquiring an analog differential signal which is output by the acquisition signal output circuit and obtained by the last simulation, converting the analog differential signal into a digital differential signal and inputting the digital differential signal into the controller;
the controller is further configured to determine a phase of a digital differential signal obtained by a previous simulation input to the differential signal acquisition circuit, and subtract the phase of a digital excitation signal used by the previous simulation from the determined phase to obtain a compensation phase difference; and according to the compensation phase difference, performing phase compensation on the digital differential signal of the current simulation calculation.
Optionally, the differential signal acquisition circuit includes:
the second program control signal conditioning circuit is used for being controlled by the controller to expand the acquisition amplitude range of the analog differential signal;
and the second analog-to-digital conversion circuit is used for converting the analog differential signal obtained by the last simulation into a digital differential signal under the control of the controller and inputting the converted digital differential signal into the controller.
The embodiment of the invention also provides an RVDT signal simulation method which is applied to a controller and comprises the following steps:
acquiring a digital excitation signal;
determining the current wiring mode of the RVDT, and determining the functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal from the preset functional relation between the differential signal corresponding to each wiring mode of the RVDT and the excitation signal;
and calculating a digital differential signal corresponding to the digital excitation signal according to the determined functional relationship.
Optionally, the functional relationship between the differential signal and the excitation signal indicates a functional relationship that the frequency of the differential signal is the same as that of the excitation signal, and the amplitude of the differential signal changes with the angular displacement; said calculating a digital difference signal corresponding to said digital excitation signal based on said determined functional relationship comprises:
analyzing the digital excitation signal, and determining the amplitude and the frequency of the digital excitation signal;
determining a current angular displacement;
and determining a digital differential signal corresponding to the amplitude, the frequency and the current angular displacement according to the determined functional relation.
Optionally, the RVDT signal simulation method further includes:
acquiring a digital differential signal obtained by the last simulation;
determining the phase of the digital differential signal obtained by the last simulation;
subtracting the phase of the digital excitation signal used by the previous simulation from the determined phase to obtain a compensation phase difference;
and according to the compensation phase difference, performing phase compensation on the digital differential signal of the current simulation calculation.
The embodiment of the invention also provides an RVDT signal simulation device which is applied to a controller, and the device comprises:
the acquisition module is used for acquiring a digital excitation signal;
the functional relation determining module is used for determining the current wiring mode of the RVDT and determining the functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal from the preset functional relation between the differential signal corresponding to each wiring mode of the RVDT and the excitation signal;
and the differential signal calculation module is used for calculating the digital differential signal corresponding to the digital excitation signal according to the determined functional relation.
Based on the above technical solution, the RVDT signal simulation circuit provided in the embodiment of the present invention may preset, by the controller, a functional relationship between a differential signal and an excitation signal corresponding to each wiring mode of the RVDT, so that after the current wiring mode of the RVDT used for simulation is determined, a digital differential signal corresponding to the digital excitation signal may be calculated based on the digital excitation signal input by the signal acquisition circuit and the functional relationship between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal; and then the signal output circuit performs digital-to-analog conversion on the digital differential signal to obtain an analog differential signal, thereby completing the signal simulation of the RVDT. The embodiment of the invention calculates the digital differential signals corresponding to the digital excitation signals in a data processing mode through the controller, and presets the functional relation between the differential signals corresponding to the wiring modes of the RVDTs and the excitation signals in the controller, so that the calling of the functional relation between the differential signals of the corresponding wiring modes and the excitation signals can be realized when any wiring mode of the RVDTs is selected for signal simulation, the digital differential signals corresponding to the digital excitation signals are calculated, the aim of being compatible with the signal simulation of the RVDTs of different wiring modes in one RVDT signal simulation circuit is realized, the adjustment of the signal simulation of the RVDTs of different wiring modes can be realized by adjusting the functional relation between the called differential signals and the excitation signals, the simulation cost is lower, and the simulation realization process is more convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an RVDT signal simulation circuit according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating a controller calculating a digital differential signal according to an embodiment of the present invention;
FIG. 3 is another schematic diagram of an RVDT signal simulation circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another RVDT signal simulation circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another RVDT signal simulation circuit according to an embodiment of the present invention;
fig. 6 is a flowchart of an RVDT signal simulation method according to an embodiment of the present invention;
FIG. 7 is a flowchart of a method for calculating a digital differential signal according to an embodiment of the present invention;
FIG. 8 is a flowchart of a method for compensating a phase of a differential signal according to an embodiment of the present invention;
fig. 9 is a block diagram of an RVDT signal simulation apparatus according to an embodiment of the present invention;
fig. 10 is a block diagram of a differential signal calculation module according to an embodiment of the present invention;
fig. 11 is another structural block diagram of the RVDT signal simulation apparatus according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The RVDT signal simulation requires that when the sensor primary coil of the RVDT receives the input of the excitation signal, the sensor secondary coil of the RVDT needs to output a differential signal corresponding to the excitation signal; and because the functional relationship of the output differential signal and the input excitation signal is different due to different wiring modes of the RVDT, the signal simulation of the RVDT compatible with different wiring modes becomes a difficult problem in the signal simulation of the RVDT.
In order to realize signal simulation compatibility of the RVDTs in different wiring modes, the embodiment of the invention mainly adopts a controller to simulate the output of differential signals corresponding to excitation signals in a software mode, and simulates the differential signals corresponding to the excitation signals in the wiring mode and outputs the differential signals by presetting a signal simulation algorithm (namely a functional relation between the differential signals corresponding to the wiring modes of the RVDTs and the excitation signals) so that when a user selects a certain wiring mode of the RVDTs to simulate the signals, the controller can call the signal simulation algorithm corresponding to the wiring mode to simulate the differential signals corresponding to the excitation signals in the wiring mode. In this way, the controller can call a signal simulation algorithm corresponding to the wiring mode selected by the user based on any wiring mode of the RVDT selected by the user, and realize simulation of the RVDT signals under the wiring mode of the RVDT selected by the user, so that the aim of signal simulation of the RVDTs compatible with different wiring modes in one group of circuits is fulfilled.
Based on the above-mentioned idea, fig. 1 shows a schematic structural diagram of an RVDT signal simulation circuit provided by an embodiment of the present invention, and referring to fig. 1, the RVDT signal simulation circuit may include: the device comprises a signal acquisition circuit 10, a controller 20 and a signal output circuit 30.
The signal acquisition circuit 10 and the controller 20, and the signal output circuit 30 and the controller 20 can be connected and communicated in a wired mode;
optionally, the controller 20 may be provided with a signal input interface and a signal output interface, the signal acquisition circuit 10 may be connected to the signal input interface of the controller 20, and the signal output circuit 30 may be connected to the signal output interface of the controller 20;
further, the controller 20 may be provided with a plurality of control interfaces, and the controller 20 may be connected to the signal acquisition circuit 10, the signal output circuit 30, and even other external circuits with respect to the controller 20 through the control interfaces; the controller 20 may control the operation of the acquisition circuit 10, the signal output circuit 30, or other external circuits.
Optionally, the controller 20 may be implemented by an FPGA (Field Programmable Gate Array), and the communication protocol used by the RVDT signal simulation circuit provided in the embodiment of the present invention may be determined according to a communication protocol supported by the FPGA.
As shown in fig. 1, in the embodiment of the present invention, the signal acquisition circuit 10 may be a hardware circuit that acquires an analog excitation signal (an excitation signal in an analog form) input by the primary coil of the RVDT and converts the analog excitation signal into a digital excitation signal (an excitation signal in a digital form), and the digital excitation signal converted by the signal acquisition circuit 10 is transmitted to the controller 20 for processing;
optionally, for the acquired excitation signal, the signal acquisition circuit 10 may further expand the signal acquisition amplitude range of the excitation signal; correspondingly, the signal acquisition circuit 10 can be implemented by configuring a program-controlled signal conditioning circuit capable of expanding the signal acquisition amplitude range, an analog-to-digital conversion circuit (AD conversion circuit) capable of performing analog-to-digital conversion, and the like;
alternatively, the signal collecting circuit 10 may be controlled by the controller 20 to collect the excitation signal, such as under the control of the controller 20, to expand the signal collecting amplitude range of the excitation signal, under the control of the controller 20, to realize the conversion of the excitation signal from an analog signal to a digital signal, and so on.
The controller 20 is preset with a function relationship between the difference signal corresponding to each wiring mode of the RVDT and the excitation signal in advance, and can receive the current wiring mode information of the RVDT configured by the user on the upper computer 40 when the RVDT signal is simulated; optionally, the RVDT current wiring pattern received by the controller may be latched into a register (e.g., when the controller employs an FPGA controller, the register of the FPGA controller may latch the received RVDT current wiring pattern);
optionally, the user transmits the configured RVDT current wiring mode to the controller 20 through the upper computer 40, which is only an optional manner for the controller 20 to determine the RVDT current wiring mode; the user can transmit the configured RVDT current wiring mode to the controller 20 through any communication mode supported by the controller 20;
after the controller 20 determines the current wiring pattern of the RVDT used for the simulation, the functional relationship between the differential signal corresponding to the current wiring pattern of the RVDT and the driving signal is determined from the preset functional relationship between the differential signal corresponding to each wiring pattern of the RVDT and the driving signal, so as to calculate a digital differential signal (differential signal in digital form) corresponding to the digital driving signal input to the controller 20, and output the calculated digital differential signal to the signal output circuit 30.
The signal output circuit 30 can convert the digital differential signal output by the controller 20 into an analog differential signal (differential signal in a mode form), so as to obtain an analog differential signal corresponding to the analog excitation signal input to the primary coil of the RVDT sensor, thereby completing signal simulation of the RVDT sensor;
optionally, the signal output circuit 30 may perform post-processing such as filtering, power amplification and the like on the analog differential signal besides converting the digital differential signal into the analog differential signal;
accordingly, the signal output circuit can be realized by providing a digital-to-analog conversion circuit (DA conversion circuit) capable of performing digital-to-analog conversion, a filter circuit capable of performing filter processing, a power amplifier circuit capable of amplifying signal power, and the like.
The RVDT signal simulation circuit provided by the embodiment of the invention can preset the functional relationship between the differential signal and the excitation signal corresponding to each wiring mode of the RVDT through the controller, so that after the current wiring mode of the RVDT used for simulation is determined, the digital differential signal corresponding to the digital excitation signal can be calculated based on the digital excitation signal input by the signal acquisition circuit and the functional relationship between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal; and then the signal output circuit performs digital-to-analog conversion on the digital differential signal to obtain an analog differential signal, thereby completing the signal simulation of the RVDT. The embodiment of the invention calculates the digital differential signals corresponding to the digital excitation signals in a data processing mode through the controller, and presets the functional relation between the differential signals corresponding to the wiring modes of the RVDTs and the excitation signals in the controller, so that the calling of the functional relation between the differential signals of the corresponding wiring modes and the excitation signals can be realized when any wiring mode of the RVDTs is selected for signal simulation, the digital differential signals corresponding to the digital excitation signals are calculated, the aim of being compatible with the signal simulation of the RVDTs of different wiring modes in one RVDT signal simulation circuit is realized, the adjustment of the signal simulation of the RVDTs of different wiring modes can be realized by adjusting the functional relation between the called differential signals and the excitation signals, the simulation cost is lower, and the simulation realization process is more convenient.
In the RVDT signal simulation, the electrical characteristics of the RVDT are mainly reflected in that when the primary coil of the sensor receives the input of the excitation signal, the secondary coil of the sensor outputs a differential signal which has the same frequency as the excitation signal and the amplitude which changes along with the change of the angular displacement;
taking RVDT of three-wire system and four-wire system wiring mode as an example, the excitation signal V of the primary coil of the sensor is setEXCA is the amplitude of the excitation signal, f is the frequency of the excitation signal, VEXCVoltage is indicated. The angular displacement range is set as (-theta)M,ΘM) When the current angular displacement is alpha, K is the transformation ratio of the secondary coil and the primary coil, the secondary coil of the sensor outputs a differential signal V at two endsA、VB,VARepresenting the voltage at terminal A (typically a winding), VBRepresents the voltage at terminal B (typically the other winding); the differential signal of one of the channels can be represented as VA=A*K*sin2πft*(0.5+α/(2ΘM) The differential signal of the other channel may be represented as V)B=A*K*sin2πft*(0.5-α/(2ΘM) ); in the RVDT of the two-wire system wiring mode, the secondary coil of the sensor only outputs a single-ended differential signal VA
The embodiment of the invention can analyze the functional relationship between the excitation signal and the differential signal in each wiring mode of the RVDT (such as the functional relationship between the excitation signal and the differential signal in the two-wire, three-wire and four-wire wiring modes shown above), and arrange and preset the functional relationship between the excitation signal and the differential signal corresponding to each wiring mode of the RVDT in the controller.
Because the primary coil of the sensor receives the input of the excitation signal, the secondary coil of the sensor needs to output a differential signal which has the same frequency as the excitation signal and the amplitude which changes along with the change of the angular displacement, after the controller determines the functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal, the controller needs to calculate a digital differential signal based on the parameters of the amplitude A, the frequency f, the current angular displacement alpha and the like of the excitation signal; specifically, in the embodiment of the present invention, the controller may analyze the digital excitation signal input by the signal input module, determine the amplitude a and the frequency f of the digital excitation signal, determine the current angular displacement α configured by the user, and determine the digital differential signal corresponding to the amplitude a, the frequency f, and the current angular displacement α based on the functional relationship between the differential signal corresponding to the current wiring mode and the excitation signal.
Taking the functional relationship between the excitation signal and the differential signal as an example, optionally, fig. 2 shows an optional schematic diagram of the controller for calculating the digital differential signal, as shown in fig. 2, after receiving the digital excitation signal input by the signal input module, the controller may analyze the digital excitation signal to determine the amplitude a and the frequency f of the digital excitation signal;
optionally, the amplitude a may be obtained by collecting a waveform of the excitation signal and extracting a maximum value of an amplitude of the waveform, and the frequency f may be measured by measuring a time of a zero crossing point of the waveform of the excitation signal; further, the controller may also determine a phase of the digital excitation signal, which may be found by looking up a waveform look-up table;
optionally, the controller may receive a current wiring mode and a current angular displacement α of the RVDT configured by the user through the upper computer, and obtain a predefined transformation ratio K between the secondary coil and the primary coil of the RVDT sensor, and set an upper limit value Θ of an angular displacement rangeM(ii) a The controller can determine the function relation between the preset excitation signal corresponding to the current wiring mode of the RVDT and the differential signal, and the amplitude A and the frequency f of the digital excitation signal, the current angular displacement alpha configured by a user, the predefined transformation ratio K of the secondary coil and the primary coil, and the set upper limit theta of the angular displacement rangeMAnd substituting the digital differential signal into the determined functional relation to calculate the digital differential signal.
Optionally, the differential signal at each end calculated by the controller may have a high channel value and a low channel value, and accordingly, the signal output circuit needs to perform two-channel digital-to-analog conversion, filtering, power amplification and the like on the high channel value and the low channel value, respectively, for the differential signal at each end calculated by the controller;
optionally, fig. 3 shows another schematic structural diagram of an RVDT signal simulation circuit provided in an embodiment of the present invention, which is shown in fig. 1 and fig. 3, and in fig. 3, the structure of the signal acquisition circuit 10 and the signal output circuit 30 is refined;
specifically, the signal acquisition circuit 10 may include: a first program control signal conditioning circuit 11, a first analog-to-digital conversion circuit 12 (a first AD conversion circuit);
the first programmable signal conditioning circuit 11 can expand the acquisition amplitude range of the analog excitation signal input to the primary coil of the sensor, so that the first AD conversion circuit 12 at the later stage can obtain the full-scale analog excitation signal; optionally, the first program-controlled signal conditioning circuit 11 may implement a controllable gain conditioning function of the analog excitation signal under the control of the controller 20, and effectively expand an acquisition amplitude range of the analog excitation signal, and accordingly, a control program for controlling the first program-controlled signal conditioning circuit may be set in the controller 20;
the first AD conversion circuit is used for performing analog-to-digital conversion on the analog excitation signal which is processed by the first program control signal conditioning circuit and is used for expanding the acquisition amplitude range, and outputting the converted digital excitation signal to the controller 20; alternatively, the first AD conversion circuit may implement an analog-to-digital conversion function under the control of the controller, and accordingly, a control program for controlling the first AD conversion circuit may be provided in the controller 20.
Since the signal output circuit 30 needs to perform the dual-channel processing of the high channel value and the low channel value on the differential signal at each end calculated by the controller, in the embodiment of the present invention, the signal output circuit 30 may set a dual-channel processing circuit for the differential signal at each end;
as shown in fig. 3, the signal output circuit 30 may include: a first two-channel digital-to-analog conversion circuit (first two-channel DA conversion circuit) 31, a first two-channel filter circuit 32, a first two-channel power amplification circuit 33, a second two-channel digital-to-analog conversion circuit (second two-channel DA conversion circuit) 34, a second two-channel filter circuit 35, a second two-channel power amplification circuit 36;
the first dual-channel DA conversion circuit 31 may perform digital-to-analog conversion processing on the digital differential signals of the high channel and the low channel at one end output by the controller, respectively; a digital differential signal V of one end as output by the controllerAThe high-channel digital differential signal and the low-channel digital differential signal can be converted into a high-channel analog differential signal V by the processing of the first two-channel DA conversion circuit 31A1And a low channel analog differential signal VA2(ii) a The first dual filter circuit 32 may convert the high-channel analog differential signal V converted by the first dual DA conversion circuit 31A1And a low channel analog differential signal VA2Respectively carrying out filtering processing; the first dual-channel power amplifying circuit 33 may filter the high-channel analog differential signal V filtered by the first dual-channel filtering circuit 32A1And a low channel analog differential signal VA2Respectively carrying out power amplification treatment to obtain a high-channel analog differential signal V after power amplificationA-HAnd a low channel analog differential signal VA-LThereby obtaining an analog differential signal V of one endA
Similarly, the controller obtains the digital differential signal V at the other endBThe high-channel digital differential signal and the low-channel digital differential signal can be converted into a high-channel analog differential signal V through the processing of the second two-channel DA conversion circuit 34B1And a low channel analog differential signal VB2High channel analog differential signal VB1And a low channel analog differential signal VB2Then processed by the second two-way filter circuit 35 to realize the high-channel analog differential signal VB1And a low channel analog differential signal VB2Filtering of (1); filtered high-channel analog differential signal VB1And a low channel analog differential signal VB2Then processed by a second two-way power amplifying circuit 36 to obtain a power amplified high-channel analog differential signal VB-HAnd a low channel analog differential signal VB-LThereby obtaining an analog differential signal V of the other endB
Optionally, the embodiments of the present inventionThe differential signal V can be calculated when the current wiring mode of the RVDT is a 3-wire system and a 4-wire systemA,VBWhen the current wiring mode of the RVDT is 2-wire system, only the differential signal V needs to be calculatedARealizing the simulation output of signals;
as an alternative example, four wire system time, VA-H=VA/2,VA-L=-VA/2,VB-H=VB/2,VB-L=-VB2; three wire system time, VA-H=VA,VA-L=0,VB-H=VB,VB-L0; in two-wire system, only V needs to be calculatedAI.e. correspondingly, VA-H=VA/2,VA-L=-VA/2。
In the prior art, because the simulation of the RVDT signals is performed through the combination of hardware circuits such as a multiplier, an adder, a subtracter and the like, the delay of each stage of hardware circuit causes the phase deviation of a differential signal and an excitation signal, and the simulation result has errors; in the prior art, in order to solve the deviation, a hardware compensation circuit is generally arranged to compensate the phase deviation, however, the arrangement of the hardware compensation circuit easily causes the oscillation of the circuit, and the self-adaptive phase compensation in the working frequency range of the sensor cannot be realized;
in order to better solve the problem of errors in simulation results caused by phase deviation between the differential signal and the excitation signal, and reduce circuit oscillation in the phase deviation compensation process, so as to implement adaptive phase compensation in the sensor operating frequency range, fig. 4 shows a further structural schematic diagram of the RVDT signal simulation circuit provided by the embodiment of the present invention, and in combination with fig. 1 and fig. 4, on the basis of fig. 1, the RVDT signal simulation circuit shown in fig. 4 further includes: a differential signal acquisition circuit 50;
the differential signal acquisition circuit 50 is configured to acquire an analog differential signal output by the signal output circuit 30 and obtained through the last simulation, convert the analog differential signal into a digital differential signal, and input the digital differential signal into the controller 20;
optionally, for the analog differential signal obtained by the last simulation output by the acquired signal output circuit, the differential signal acquisition circuit 50 may further expand the signal acquisition amplitude range of the analog differential signal;
correspondingly, the differential signal acquisition circuit 50 can be implemented by configuring a program-controlled signal conditioning circuit capable of expanding the signal acquisition amplitude range, an analog-to-digital conversion circuit capable of performing analog-to-digital conversion, and the like; it should be noted that, the principle of the program-controlled signal conditioning circuit, the analog-to-digital conversion circuit and the signal acquisition circuit configured by the differential signal acquisition circuit 50 may be the same, but not the same hardware;
optionally, the differential signal acquisition circuit 50 may implement a controllable gain conditioning function of the analog differential signal under the control of the controller 20, so as to effectively expand an acquisition amplitude range of the analog differential signal, and meanwhile, the differential signal acquisition circuit 50 may perform analog-to-digital conversion under the control of the controller 20.
After receiving the digital differential signal obtained by the previous simulation input by the differential signal acquisition circuit 50, the controller 20 may analyze the phase of the digital differential signal to determine the phase θ 1 of the digital differential signal, subtract the phase θ 1 of the digital differential signal from the phase θ 2 of the digital excitation signal input to the controller during the previous simulation to obtain the compensation phase difference θ 1- θ 2; the controller 20 will perform phase compensation on the digital differential signal calculated by the current simulation according to the compensation phase difference during the current simulation;
that is, the controller 20 may calculate a compensation phase difference at the current simulation of the controller according to the phase of the differential signal obtained by the previous simulation and the phase of the excitation signal corresponding to the previous simulation, where the compensation phase difference compensates the phase deviation of the differential signal obtained at the current simulation of the controller relative to the excitation signal;
as for the differential signal obtained by the 2 nd simulation, the controller may update the compensation phase difference based on the phases of the differential signal obtained by the 2 nd simulation and the excitation signal used by the 2 nd simulation, the updated compensation phase difference being to compensate for the phase deviation of the differential signal with respect to the excitation signal when the differential signal is calculated by the 3 rd simulation;
further, since the differential signal obtained by the previous simulation does not exist when the signal simulation is performed for the first time, the compensation phase difference during the first signal simulation can be defaulted to be zero in the embodiment of the present invention;
it should be noted that, in the embodiment of the present invention, the phase difference between the differential signal obtained by the last simulation and the excitation signal used by the last simulation is compensated, so as to make the compensated phase difference approach zero, and make the phases of the differential signal and the excitation signal approach zero without deviation.
Optionally, the differential signal obtained by simulation may have a multi-end value, and when the phase deviation of the differential signal and the excitation signal is compensated, the phase difference between the differential signal of one end obtained by previous simulation and the excitation signal used by previous simulation may be used to compensate the phase deviation between the differential signal obtained by the end simulation and the excitation signal when current simulation is performed;
as shown in fig. 5, to the secondary coil voltage VATaking the phase compensation of (1) as an example, V obtained from the last simulationA_H、VAL is the differential signal V obtained by the last simulation as a wholeA(ii) a The second program control signal conditioning circuit 51 of the differential signal acquisition circuit 50 acquires the analog differential signal V obtained by the last simulation output by the signal output circuit 30AThen, the second analog-to-digital conversion circuit (second AD conversion circuit) 52 of the differential signal acquisition circuit 50 converts the analog differential signal V obtained by the last simulationAConverted into a digital differential signal and input to the controller 20; the controller 20 can analyze the digital differential signal V obtained from the last simulationAThe phase theta 1 obtained by the analysis is subtracted by the phase theta 2 of the excitation signal used in the previous simulation to obtain a differential signal V used for the current simulationAWill compensate the digital differential signal V of the present simulation at the present simulationAPhase deviation from the excitation signal;
optionally for the secondary winding voltage VBIn a manner similar to that described above for the secondary winding voltage VAThe phase compensation of (2) can be referred to each other in the same way.
The RVDT signal simulation circuit provided by the embodiment of the invention can be compatible with the RVDT signal simulation of different wiring modes in one RVDT signal simulation circuit, and realizes the RVDT signal simulation with lower cost and more convenient simulation realization process; the phase difference between the differential signal obtained by the last simulation and the excitation signal used by the last simulation can be calculated, the phase deviation between the differential signal corresponding to the current simulation and the excitation signal can be compensated, the phase deviation between the differential signal and the excitation signal can be reduced, and the accuracy of the differential signal obtained by the simulation can be improved; meanwhile, the method is different from the mode of realizing the RVDT signal simulation by manually adjusting the resistance value of the adjustable resistor connected to the secondary coil side of the transformer in the prior art, and the embodiment of the invention can realize the automation of the RVDT signal simulation.
The RVDT signal simulation method provided by the embodiments of the present invention is described below from the perspective of a controller, and the RVDT signal simulation method described below may be cross-referenced with the contents of the RVDT signal simulation circuit described above.
Fig. 6 is a flowchart of an RVDT signal simulation method according to an embodiment of the present invention, where the method is applicable to a controller, and the controller may be implemented by a data processing circuit such as an FPGA controller, and referring to fig. 6, the method may include:
s100, acquiring a digital excitation signal;
optionally, the controller may obtain a digital excitation signal acquired by the signal acquisition circuit and subjected to analog-to-digital conversion.
Step S110, determining the current wiring mode of the RVDT, and determining the functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal from the preset functional relation between the differential signal corresponding to each wiring mode of the RVDT and the excitation signal;
in the embodiment of the invention, the controller is preset with the functional relationship between the differential signal and the excitation signal corresponding to each wiring mode of the RVDT, so that when a user selects any wiring mode of the RVDT to perform signal simulation, the embodiment of the invention can call the functional relationship between the corresponding differential signal and the excitation signal to realize the calculation and output of the differential signal;
optionally, the current wiring mode of the RVDT can be configured in the upper computer by a user and then transmitted to the controller;
after the controller determines the current wiring mode of the RVDT, the controller can call a preset functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal for the signal simulation at this time.
And step S120, calculating a digital differential signal corresponding to the digital excitation signal according to the determined functional relation.
Because the functional relationship between the differential signal and the excitation signal corresponding to each wiring mode of the RVDT can be preset in the controller, the functional relationship between the differential signal and the excitation signal of the corresponding wiring mode can be called when any wiring mode of the RVDT is selected for signal simulation, the digital differential signal corresponding to the digital excitation signal can be calculated, and the purpose of being compatible with RVDT signal simulation of different wiring modes in one RVDT signal simulation circuit can be realized.
Optionally, in any wiring mode of the RVDT, the functional relationship between the differential signal and the excitation signal may be expressed as a functional relationship in which the frequency of the differential signal is the same as that of the excitation signal, and the amplitude of the differential signal changes with the angular displacement; namely, when the sensor primary coil of the RVDT receives the input of the excitation signal, the sensor secondary coil outputs a differential signal which has the same frequency as the excitation signal and the amplitude which changes along with the change of the angular displacement; the specific functional relation expression can refer to the description of the RVDT signal simulation circuit part;
correspondingly, fig. 7 shows a flow of a method for calculating, by the controller, a digital differential signal corresponding to the digital excitation signal according to a functional relationship used in the present simulation, and referring to fig. 7, the method may include:
step S200, analyzing the digital excitation signal, and determining the amplitude and the frequency of the digital excitation signal;
step S210, determining the current angular displacement;
step S220, determining digital differential signals corresponding to the amplitude, the frequency and the current angular displacement according to the determined functional relation.
Optionally, the embodiment of the present invention may obtain a predefined transformation ratio between the secondary coil and the primary coil of the RVDT sensor, and a set upper limit value of the angular displacement range; and the amplitude, the frequency, the current angular displacement, the transformation ratio and the upper limit value of the angular displacement range are substituted into the determined functional relation, and the digital differential signal is calculated.
Furthermore, in the embodiment of the present invention, when the digital differential signal is calculated each time, the phase compensation of the calculated digital differential signal can be performed through the phase difference between the differential signal obtained by the previous simulation and all the excitation signals simulated at the previous time;
optionally, fig. 8 is a flowchart illustrating a method for compensating a phase of a differential signal according to an embodiment of the present invention, and referring to fig. 8, the method may include:
step S300, obtaining a digital differential signal obtained by the last simulation;
optionally, the controller may obtain a digital differential signal acquired by the differential signal acquisition circuit from the signal output circuit and subjected to analog-to-digital conversion.
Step S310, determining the phase of the digital differential signal obtained by the previous simulation;
step S320, subtracting the phase of the digital excitation signal used by the previous simulation from the determined phase to obtain a compensation phase difference;
and S330, performing phase compensation on the digital differential signal of the current simulation calculation according to the compensation phase difference.
By the method shown in fig. 8, the phase of the digital differential signal calculated by each simulation can be compensated through the phase difference between the differential signal obtained by the previous simulation and all the excitation signals obtained by the previous simulation, so that the phase deviation between the differential signal and the excitation signals is reduced, and the accuracy of the differential signal obtained by the simulation is improved.
Optionally, the differential signal obtained by simulation may have a multi-end value, and a phase difference between the differential signal of one end obtained by previous simulation and the excitation signal used by previous simulation may be used to compensate for a phase deviation between the differential signal obtained by simulation of the end and the excitation signal in current simulation.
The embodiment of the invention also provides an RVDT signal simulation device, which can be regarded as a functional module architecture required to be set by a controller for realizing the RVDT signal simulation method, and the specific contents can be referred to each other; the controller can burn or write in a program corresponding to the functional module architecture to realize the implementation of the RVDT signal simulation method.
Fig. 9 is a block diagram of an RVDT signal simulation apparatus according to an embodiment of the present invention, where the RVDT signal simulation apparatus is applicable to a controller, and referring to fig. 9, the RVDT signal simulation apparatus may include:
an obtaining module 100, configured to obtain a digital excitation signal;
a functional relationship determining module 200, configured to determine a current wiring mode of the RVDT, and determine a functional relationship between a differential signal and an excitation signal corresponding to the current wiring mode of the RVDT from a preset functional relationship between a differential signal and an excitation signal corresponding to each wiring mode of the RVDT;
a differential signal calculation module 300, configured to calculate a digital differential signal corresponding to the digital excitation signal according to the determined functional relationship.
Alternatively, fig. 10 shows an alternative structure of the differential signal calculation module 300, and referring to fig. 10, the differential signal calculation module 300 may include:
an analyzing unit 310, configured to analyze the digital excitation signal and determine an amplitude and a frequency of the digital excitation signal;
an angular displacement determination unit 320 for determining a current angular displacement;
a calculating unit 330, configured to determine, according to the determined functional relationship, a digital differential signal corresponding to the amplitude, the frequency, and the current angular displacement.
Optionally, the calculating unit 330 is specifically configured to calculate the digital differential signal by substituting the amplitude, the frequency, the current angular displacement, a predefined transformer ratio of the sensor secondary coil and the sensor primary coil of the RVDT, and a set upper limit value of an angular displacement range into the determined functional relationship.
Optionally, fig. 11 shows another structural block diagram of the RVDT signal simulation apparatus, and in conjunction with fig. 9 and fig. 11, the apparatus may further include:
a differential signal obtaining module 400, configured to obtain a digital differential signal obtained through previous simulation;
a phase determining module 500, configured to determine a phase of a digital differential signal obtained by a previous simulation;
a phase difference determining module 600, configured to subtract the phase of the digital excitation signal used in the previous simulation from the determined phase to obtain a compensated phase difference;
and the phase compensation module 700 is configured to perform phase compensation on the digital differential signal currently calculated by simulation according to the compensation phase difference.
Optionally, the differential signal obtained by simulation may have a multi-end value, and a phase difference between the differential signal of one end obtained by previous simulation and the excitation signal used by previous simulation may be used to compensate for a phase deviation between the differential signal obtained by simulation of the end and the excitation signal in current simulation.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. An RVDT signal simulation circuit, comprising: the signal acquisition circuit, the controller and the signal output circuit;
the signal acquisition circuit is used for acquiring an analog excitation signal input by a sensor primary coil of the RVDT, converting the analog excitation signal into a digital excitation signal and transmitting the converted digital excitation signal to the controller;
the controller is used for determining the current wiring mode of the RVDT, determining the functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal from the preset functional relation between the differential signal corresponding to each wiring mode of the RVDT and the excitation signal, calculating the digital differential signal corresponding to the digital excitation signal according to the determined functional relation, and transmitting the determined digital differential signal to the signal output circuit;
the signal output circuit is used for converting the digital differential signal into an analog differential signal;
further comprising: a differential signal acquisition circuit;
the differential signal acquisition circuit is used for acquiring an analog differential signal which is output by the acquisition signal output circuit and obtained by the last simulation, converting the analog differential signal into a digital differential signal and inputting the digital differential signal into the controller;
the controller is further configured to determine a phase of a digital differential signal obtained by a previous simulation input to the differential signal acquisition circuit, and subtract the phase of a digital excitation signal used by the previous simulation from the determined phase to obtain a compensation phase difference; and according to the compensation phase difference, performing phase compensation on the digital differential signal of the current simulation calculation.
2. The RVDT signal simulation circuit according to claim 1, wherein the controller is configured to calculate a digital differential signal corresponding to the digital stimulus signal based on the determined functional relationship, in particular comprising:
analyzing the digital excitation signal, and determining the amplitude and the frequency of the digital excitation signal;
determining a current angular displacement;
and determining a digital differential signal corresponding to the amplitude, the frequency and the current angular displacement according to the determined functional relation.
3. The RVDT signal simulation circuit of claim 2, wherein the controller is configured to determine a digital differential signal corresponding to the amplitude, frequency and the current angular displacement from the determined functional relationship, in particular comprising:
acquiring a predefined transformer ratio of a sensor secondary coil and a sensor primary coil of the RVDT and a set angular displacement range upper limit value;
and substituting the amplitude, the frequency, the current angular displacement, the transformation ratio and the angular displacement range upper limit value into the determined functional relation to calculate the digital differential signal.
4. The RVDT signal simulation circuit of claim 1, wherein the signal acquisition circuit comprises: the first program control signal conditioning circuit and the first analog-to-digital conversion circuit;
the first program-controlled signal conditioning circuit is used for expanding the acquisition amplitude range of the analog excitation signal of the primary coil of the input sensor under the control of the controller;
the first analog-to-digital conversion circuit is used for carrying out analog-to-digital conversion on the analog excitation signal which is processed by the first program control signal conditioning circuit and is used for expanding the acquisition amplitude range under the control of the controller and transmitting the converted digital excitation signal to the controller;
the signal output circuit includes: the first double-channel digital-to-analog conversion circuit, the first double-channel filter circuit, the first double-channel power amplification circuit, the second double-channel digital-to-analog conversion circuit, the second double-channel filter circuit and the second double-channel power amplification circuit;
the first double-channel digital-to-analog conversion circuit is used for respectively carrying out digital-to-analog conversion processing on the digital differential signals of the high channel and the low channel at one end output by the controller;
the first dual-channel filter circuit is used for respectively filtering the analog differential signals of the high channel and the low channel converted by the first dual-channel digital-to-analog conversion circuit;
the first dual-path power amplifying circuit is used for respectively performing power amplification processing on the analog differential signals of the high channel and the low channel filtered by the first dual-path filter circuit;
the second double-channel digital-to-analog conversion circuit is used for respectively carrying out digital-to-analog conversion processing on the digital differential signals of the high channel and the low channel at the other end output by the controller;
the second dual-channel filter circuit is used for respectively filtering the analog differential signals of the high channel and the low channel converted by the second dual-channel digital-to-analog conversion circuit;
the second dual-path power amplifying circuit is used for respectively performing power amplification processing on the analog differential signals of the high channel and the low channel filtered by the second dual-path filter circuit.
5. The RVDT signal simulation circuit of claim 1, wherein the differential signal acquisition circuit comprises:
the second program control signal conditioning circuit is used for being controlled by the controller to expand the acquisition amplitude range of the analog differential signal;
and the second analog-to-digital conversion circuit is used for converting the analog differential signal obtained by the last simulation into a digital differential signal under the control of the controller and inputting the converted digital differential signal into the controller.
6. An RVDT signal simulation method, applied to a controller, the method comprising:
acquiring a digital excitation signal;
determining the current wiring mode of the RVDT, and determining the functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal from the preset functional relation between the differential signal corresponding to each wiring mode of the RVDT and the excitation signal;
calculating a digital differential signal corresponding to the digital excitation signal according to the determined functional relationship;
further comprising:
acquiring a digital differential signal obtained by the last simulation;
determining the phase of the digital differential signal obtained by the last simulation;
subtracting the phase of the digital excitation signal used by the previous simulation from the determined phase to obtain a compensation phase difference;
and according to the compensation phase difference, performing phase compensation on the digital differential signal of the current simulation calculation.
7. The RVDT signal simulation method according to claim 6, wherein the calculating a digital differential signal corresponding to the digital stimulus signal according to the determined functional relationship comprises:
analyzing the digital excitation signal, and determining the amplitude and the frequency of the digital excitation signal;
determining a current angular displacement;
and determining digital differential signals corresponding to the amplitude, the frequency and the current angular displacement according to the determined functional relation between the differential signals corresponding to the RVDT current wiring mode and the excitation signals.
8. An RVDT signal simulation apparatus, for use in a controller, the apparatus comprising:
the acquisition module is used for acquiring a digital excitation signal;
the functional relation determining module is used for determining the current wiring mode of the RVDT and determining the functional relation between the differential signal corresponding to the current wiring mode of the RVDT and the excitation signal from the preset functional relation between the differential signal corresponding to each wiring mode of the RVDT and the excitation signal;
the differential signal calculation module is used for calculating a digital differential signal corresponding to the digital excitation signal according to the determined functional relationship between the differential signal corresponding to the RVDT current wiring mode and the excitation signal;
the device further comprises:
the differential signal acquisition module is used for acquiring a digital differential signal obtained by the last simulation;
the phase determining module is used for determining the phase of the digital differential signal obtained by the previous simulation;
the phase difference determining module is used for subtracting the phase of the digital excitation signal used by the previous simulation from the determined phase to obtain a compensation phase difference;
and the phase compensation module is used for performing phase compensation on the digital differential signal of the current simulation calculation according to the compensation phase difference.
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