CN111695317B - Rotary-change signal simulation device, simulation system and simulation method - Google Patents
Rotary-change signal simulation device, simulation system and simulation method Download PDFInfo
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- G06F30/30—Circuit design
- G06F30/34—Circuit design for reconfigurable circuits, e.g. field programmable gate arrays [FPGA] or programmable logic devices [PLD]
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Abstract
The invention discloses a simulation device, a simulation system and a simulation method for a rotation-varying signal, wherein the device comprises: the device comprises a rotation simulation unit and a signal processing unit, wherein the rotation simulation unit is used for outputting rotation simulation signals according to input excitation signals; the signal processing unit is used for receiving and processing an excitation test signal output by the motor to be tested to generate the excitation signal suitable for being received by the rotation simulation unit, and receiving and processing the rotation simulation signal output by the rotation simulation unit to generate a rotation simulation test signal suitable for being received by the motor to be tested. According to the invention, the excitation test signal is processed to generate the excitation signal meeting the voltage requirement of the rotary simulation unit, and the rotary simulation signal output by the rotary simulation unit is processed to generate the rotary simulation test signal suitable for being received by the motor to be tested, so that the simulation of various rotary signals is compatible, and the method has the characteristics of good compatibility, test safety and high test precision.
Description
Technical Field
The invention relates to the field of motor testing. And more particularly, to a rotation-varying signal simulation apparatus, a simulation system, and a simulation method.
Background
At present, a test system can be directly connected into a physical motor for motor test, however, the method has the following defects: 1. the motor is large in size and inconvenient for system integration; 2. the rotating speed of the motor actually rotating around 6000 revolutions is large by 3, and the same motor cannot be compatible with the tests of different motor controller products.
In the prior art, an FPGA board card can be used for replacing a physical motor to test the motor. According to the method, the FPGA board card is inserted into a case in the equipment, and the FPGA board card is used for simulating a rotary-change signal simulation motor for testing. However, since the output voltage and the input voltage of the FPGA board are only typically-10V to 10V, in order to reduce signal interference during the test, a high dc bias voltage is usually added to the spin-change signal, which results in that the voltage of the spin-change signal in this state exceeds the input and output voltage ranges of the FPGA board. Moreover, the same FPGA board cannot be compatible with various voltage changes due to the limitation of input and output voltage ranges of the FPGA board in the face of rotation signals with different voltage amplitudes. In the prior art, the FPGA board card can only be inserted into a case inside the equipment, so that near point measurement cannot be realized, and the motor test precision is inaccurate due to easy interference in the signal transmission process.
Therefore, a new device, system and method for simulating a rotation-varying signal are needed.
Disclosure of Invention
The invention aims to provide a rotation-varying signal simulation device, a simulation system and a simulation method, which are used for solving at least one of the problems in the prior art;
in order to achieve the above purpose, the invention adopts the following technical scheme:
the first aspect of the present invention provides a rotation-varying signal simulation device, including:
a rotation simulation unit and a signal processing unit, wherein
The rotation simulation unit is used for outputting rotation simulation signals according to the input excitation signals;
the signal processing unit is used for receiving and processing an excitation test signal output by the motor to be tested to generate the excitation signal suitable for being received by the rotation simulation unit, and receiving and processing the rotation simulation signal output by the rotation simulation unit to generate a rotation simulation test signal suitable for being received by the motor to be tested.
Optionally the spiral variation simulation unit comprises:
the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the received excitation signal and outputting a digital excitation signal;
the rotary simulation device is used for receiving the digital excitation signal, simulating and outputting a digital rotary simulation signal;
the digital-to-analog conversion unit is used for carrying out digital-to-analog conversion on the received digital rotary-to-analog simulation signal and outputting the rotary-to-analog simulation signal.
Optionally, the rotary transformer simulation unit further includes a network communication unit, configured to communicate with the signal processing unit and communicate with an external device.
Optionally, the signal processing unit includes:
the first processing unit is used for receiving and processing an excitation test signal output by the motor to be tested to generate the excitation signal suitable for being received by the rotary transformer simulation unit;
the second processing unit is used for receiving and processing the rotation simulation signals output by the rotation simulation unit to generate rotation simulation test signals suitable for being received by the motor to be tested.
Optionally, the first processing unit includes a first filtering unit and a first operational amplifier unit, the clutter of the excitation test signal is filtered by the first filtering unit, and the excitation signal suitable for being received by the rotation simulation unit is output by shrinking or amplifying by the first operational amplifier unit; the second processing unit comprises a second filtering unit and a second operational amplifier unit, clutter in the rotation simulation signal is filtered through the second filtering unit, and the clutter is reduced or amplified through the second operational amplifier unit to output the rotation simulation test signal which is suitable for being received by the motor to be tested.
Optionally, the rotation simulation signal includes a sine signal and a cosine signal.
Optionally, the spiral variation simulation device is Xilinx-XC5VLX30.
A second aspect of the present invention provides a system for simulating a rotation-varying signal, comprising a control terminal and a simulation device as described above,
the control terminal is used for sending a control instruction to the simulation device to control the motor to be tested of the simulation device to output an excitation test signal to the signal processing unit, converting the excitation signal into an excitation signal suitable for being received by the rotation simulation unit through the signal processing unit and transmitting the excitation signal to the rotation simulation unit, so that the rotation simulation unit outputs a rotation simulation signal to the signal processing unit according to the excitation signal, converting the excitation signal into a rotation simulation test signal suitable for being received by the motor to be tested through the signal processing unit and transmitting the rotation simulation signal to the rotation simulation unit.
Optionally, the emulation system further comprises a switch, wherein the switch is used for exchanging and transmitting data between the control terminal and the emulation device.
The third aspect of the present invention provides a method for performing a rotation signal simulation by using the rotation signal simulation system, including:
the control terminal sends a control instruction to a motor to be tested of the simulation device;
the motor to be tested outputs an excitation test signal and transmits the excitation test signal to the signal processing unit, and the excitation test signal is converted into an excitation signal suitable for being received by the rotary simulation unit through the signal processing unit;
and the rotation simulation system outputs a rotation simulation signal according to the excitation signal, and converts the rotation simulation signal into a rotation simulation test signal suitable for being received by a motor to be tested through the signal processing unit.
The beneficial effects of the invention are as follows:
according to the invention, the excitation test signal is processed to generate the excitation signal meeting the voltage requirement of the rotary simulation unit, and the rotary simulation signal output by the rotary simulation unit is processed to generate the rotary simulation test signal suitable for being received by the motor to be tested, so that simulation compatible with various rotary signals is realized, and the method has the characteristics of good compatibility, test safety and high test precision.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a rotary signal simulation device according to an embodiment of the present invention;
FIG. 2 shows a schematic circuit model of a rotary encoder according to an embodiment of the present invention;
FIG. 3 illustrates a schematic diagram of the excitation signal and the rotation signal according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a simulation of a rotary signal according to an embodiment of the invention;
FIG. 5 shows a block diagram of a system for simulating a rotary signal according to an embodiment of the invention;
fig. 6 shows a flowchart of a method for simulating a spiral-change signal according to an embodiment of the invention.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
For limitation of input and output voltage ranges of an FPGA board in the prior art, as shown in fig. 1, one embodiment of the present invention discloses a device for simulating a rotation signal, which includes: a rotation simulation unit and a signal processing unit, wherein
The rotation simulation unit is used for outputting rotation simulation signals according to the input excitation signals;
the signal processing unit is used for receiving and processing an excitation test signal output by the motor to be tested to generate the excitation signal suitable for being received by the rotation simulation unit, and receiving and processing the rotation simulation signal output by the rotation simulation unit to generate a rotation simulation test signal suitable for being received by the motor to be tested.
According to the embodiment of the invention, the excitation test signal is processed for the first time to generate the excitation signal meeting the voltage requirement of the rotary simulation unit, namely, the input voltage range of the FPGA board is met; meanwhile, the second processing is carried out on the rotation simulation signals output after the simulation test signals are simulated by the rotation simulation unit, namely the rotation simulation test signals suitable for being received by the motor to be tested are generated through signal processing under the condition of meeting the output voltage range of the FPGA board card, so that the simulation of the rotation simulation signals compatible with different amplitudes is realized, the problems in the prior art can be solved, the universality and the stability are improved, and meanwhile, the characteristics of good compatibility, test safety and high test precision are achieved, and the method has wide application prospects.
Fig. 2 shows a circuit model of a classical rotary encoder, which is typically configured with a primary winding on the rotor and two secondary windings on the stator, the two stator windings being mechanically offset by 90 °, so that the rotation can produce two output voltages (S3-S1, S2-S4) modulated by the sine and cosine of the shaft angle. As shown in FIG. 2, excitation signals output by a motor to be tested are connected to R1 and R2 ends, the motor rotates to generate S3-S1 sine component signals and S2-S4 cosine component signals, and the sine component signals and the cosine component signals of the excitation signals and the rotation signals are shown in FIG. 3. Since bias voltages output by rotary encoders in the market have no uniform specification, the output voltage amplitude may be various, such as 2.5v,13.5v, etc.; the output voltages of different encoders applied to different scenes are inconsistent, and the same rotary encoder cannot realize the rotation simulation of different scenes. According to the rotary change simulation device, the rotary change simulation device in the device is used for calculating according to different rotary change algorithms so as to simulate the rotary change signals of the rotary encoder. The rotary variable simulation device realizes rotary variable signal simulation of different types of rotary encoders, such as rotary photoelectric encoders, rotary transformers, magnetic induction encoders, grating encoders, induction synchronizers and the like by being configured into different encoding modes.
Similarly, because the excitation test signals output by the motor to be tested are different according to different types, for example, 13vpp,5vpp and the like, the acquisition upper limit voltage of the FPGA board card is set to be 10V, when the voltage of the acquired excitation test signals exceeds 10V, the voltage value of the output rotation simulation signals is limited to be 10V, so that the acquired excitation test signals are distorted, and further the output rotation simulation signals are distorted; even breakdown burn out of the FPGA board card, the FPGA board card cannot work. Therefore, the amplitude of the excitation signal acquired by the FPGA board and the output rotation simulation signal is limited by the upper limit voltage of the FPGA board. The embodiment of the invention utilizes the signal processing unit to collect the voltage of the excitation test signal, and reduces the voltage to the collected voltage range of the rotary simulation device through the signal processing unit, and outputs the excitation signal in the normal working range of the rotary simulation device; and when the motor is output, the voltage of the rotation simulation signal output by the rotation simulation device is processed to a voltage working range suitable for the motor to be tested by the signal processing unit, so that the rotation simulation compatible with excitation signals with various different voltage amplitudes is realized.
In some alternative implementations of the present embodiment, as shown in fig. 1, the rotation simulation unit includes:
the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the received excitation signal and outputting a digital excitation signal;
the rotary simulation device is used for receiving the digital excitation signal, simulating and outputting a digital rotary simulation signal;
the digital-to-analog conversion unit is used for carrying out digital-to-analog conversion on the received digital rotary-to-analog simulation signal and outputting the rotary-to-analog simulation signal.
In this embodiment, the analog-to-digital conversion unit converts the received excitation signal of the analog quantity into a digital excitation signal and transmits the digital excitation signal to the rotary transformer simulation device. The rotary simulation device of the embodiment adopts an FPGA, the specific model is Xilinx-XC5VLX30, digital rotary simulation signals are obtained through a rotary algorithm arranged in the FPGA according to digital excitation signals, and the digital rotary simulation signals comprise sine signals and cosine signals. In order to facilitate the signal processing unit to receive, the digital rotation simulation signal is converted into a rotation simulation signal of analog quantity through a digital-to-analog conversion unit and is output to the signal processing unit.
In some alternative implementations of the present embodiment, as shown in fig. 1, the signal processing unit includes:
the first processing unit is used for receiving and processing an excitation test signal output by the motor to be tested to generate the excitation signal suitable for being received by the rotary transformer simulation unit;
the second processing unit is used for receiving and processing the rotation simulation signals output by the rotation simulation unit to generate rotation simulation test signals suitable for being received by the motor to be tested.
In this embodiment, the signal processing unit performs signal processing on an excitation test signal output by the motor to be tested through the first processing unit, and outputs an excitation signal capable of meeting a receiving voltage range received by the rotation simulation unit. Similarly, considering the output voltage range of the rotation simulation signal output by the rotation simulation unit, the signal processing unit performs signal processing on the rotation simulation signal output by the rotation simulation unit through the second processing unit, and outputs a rotation simulation test signal capable of meeting the electrode to be tested.
In some optional implementations of this embodiment, the first processing unit includes a first filtering unit and a first operational amplifier unit, where clutter of the excitation test signal is filtered by the first filtering unit, and the clutter is reduced or amplified by the first operational amplifier unit to output the excitation signal suitable for being received by the rotation simulation unit; and
the second processing unit comprises a second filtering unit and a second operational amplifier unit, clutter in the rotation simulation signal is filtered through the second filtering unit, and the clutter is reduced or amplified through the second operational amplifier unit to output the rotation simulation test signal which is suitable for being received by the motor to be tested.
In a specific example, as shown in fig. 4, the rotary transformer simulation device adopts an FPGA chip, the first operational amplifier unit of the first processing unit adopts an attenuation circuit, and the second operational amplifier unit of the second processing unit adopts an amplification circuit. The excitation test signal of the motor to be tested is input into an attenuation circuit through a logic gate in the first processing unit, and is attenuated to a fixed multiple by the attenuation circuit to generate the excitation signal suitable for being received by the rotary simulation unit, and the excitation signal can meet input and output voltages in the normal working range of the FPGA chip.
The exciting signal passes through an analog-to-digital conversion unit (ADC) and converts the exciting signal in the form of an analog signal into a digital exciting signal in the analog-to-digital conversion unit and then outputs the digital exciting signal to the FPGA chip, the FPGA chip acquires the voltage digital signal of the exciting signal at high speed and realizes the calculation of a rotation simulation signal in the FPGA chip according to a programmed rotation algorithm, the values of sine and cosine components are calculated and then output to a digital-to-analog conversion unit (DAC), and the digital analog unit converts the digital signals of the sine and cosine components into the rotation simulation signal in the form of the analog signal and outputs the rotation simulation signal to the second processing unit. Because the voltage output by the digital-to-analog conversion unit (DAC) is in a fixed range and cannot meet the larger voltage, the voltage of the rotary-to-analog simulation test signal meeting the working range of the motor to be tested can be output after the voltage is amplified by the operational amplifier circuit of the second processing unit, so that the motor to be tested is compatible with various types of motors to be tested.
In the specific example, the simulation device not only ensures that the excitation signal input to the rotary simulation device meets the working range of the rotary simulation device through the first processing of the excitation test signal and the second processing of the output rotary simulation signal, so that the working stability of the rotary simulation device is effectively ensured, but also the precision of the excitation signal acquired by the rotary simulation device can be ensured, and the phenomenon of signal distortion acquired due to the fact that the voltage value of the excitation signal exceeds the upper limit value acquired by the rotary simulation device is avoided; after the second processing of the signal processing unit, the rotary simulation signals can be output to simulate the rotary simulation test signals of various different rotary encoders, so that the test of the motor to be tested is realized, the problem of signal output range limitation when the FPGA board card is adopted for simulation is broken through, and the universality of the rotary simulation is further enhanced.
In some optional implementations of this embodiment, the rotary transformer simulation unit further includes a network communication unit, configured to communicate with the signal processing unit and communicate with an external device, so as to implement remote communication with the signal conditioning unit and implement remote communication with the external device, where in this embodiment, the external device is an upper computer.
As shown in fig. 1, the network communication unit is integrated in the rotary transformer simulation unit, and in a specific example, the network communication unit may transmit signals by adopting a wired network interface transmission manner, such as RS485, RS232, and a CAN bus; the network communication unit can also adopt a wireless transmission mode, such as a Wifi or Bluetooth mode for transmitting signals, so that the rotary simulation unit can realize a distributed measurement mode, the near point receives an excitation signal test signal of the motor to be tested and outputs a rotary simulated sine-cosine transformation simulation signal to the motor to be tested, the signal transmission distance is shortened, and interference signals in the signal transmission process can be reduced. The whole network communication unit integrates a network port, and the rotary simulation unit can be placed at a position close to a motor to be tested through configuration of the network communication unit, so that interference signals generated in the transmission process of the rotary test are reduced to the minimum, and the stability and the accuracy of the signals are ensured.
Another embodiment of the present invention discloses a system for simulating a rotation-varying signal, as shown in fig. 5, which includes a control terminal and the above-mentioned rotation-varying signal simulation device,
the control terminal is used for sending a control instruction to the simulation device to control the motor to be tested of the simulation device to output an excitation test signal to the signal processing unit, converting the excitation signal into an excitation signal suitable for being received by the rotation simulation unit through the signal processing unit and transmitting the excitation signal to the rotation simulation unit, so that the rotation simulation unit outputs a rotation simulation signal to the signal processing unit according to the excitation signal, converting the excitation signal into a rotation simulation test signal suitable for being received by the motor to be tested through the signal processing unit and transmitting the rotation simulation signal to the rotation simulation unit.
In this embodiment, the control terminal is an upper computer, and the upper computer sends a control instruction to control the rotation-transformation signal simulation device to perform motor test on different electrodes to be tested, and specifically, the rotation-transformation simulation test signals are output through the signal processing unit and the rotation-transformation simulation unit according to excitation test signals output by different motors to be tested.
In some optional implementations of this embodiment, the emulation system further comprises a switch for exchanging and transmitting data between the control terminal and the emulation device.
In a specific example, as shown in fig. 5, the control terminal is an upper computer, the upper computer is connected with the rotation-transformation signal simulation device through a switch, and upper computer software in the upper computer can send initial parameter information to the rotation-transformation simulation device through a network port to set parameters of the rotation-transformation simulation device, for example: the information such as the transformation ratio, the rotating speed and the initial angle when the rotation transformation simulation device performs rotation transformation simulation; the upper computer software sends a control instruction to the motor to be tested, and drives the exciting motor to be tested to send an excitation test signal; the rotary simulation device carries out rotary simulation according to the received parameter information and the excitation test signal, wherein the signal processing unit receives the excitation test signal, converts the excitation test signal into an excitation signal suitable for being received by the rotary simulation unit and transmits the excitation signal to the rotary simulation unit, so that the rotary simulation unit outputs a rotary simulation signal to the signal processing unit according to the excitation signal, and the rotary simulation signal is converted into a rotary simulation test signal suitable for being received by a motor to be tested by the signal processing unit and transmitted to the rotary simulation unit. The embodiment of the invention can solve the problems in the prior art, improves the universality and the stability, and has the characteristics of good compatibility, test safety and high test precision. The simulation system of the embodiment of the invention can provide simulation of various rotation simulation signals.
It should be noted that, the principle and the workflow of the rotary signal simulation system provided in this embodiment are similar to those of the rotary signal simulation device described above, and the relevant parts can be referred to the above description, and are not repeated here.
As shown in fig. 6, another embodiment of the present invention discloses a method for performing a spiral-change signal simulation by using the spiral-change signal simulation system, which includes:
the control terminal sends a control instruction to a motor to be tested of the simulation device;
the motor to be tested outputs an excitation test signal and transmits the excitation test signal to the signal processing unit, and the excitation test signal is converted into an excitation signal suitable for being received by the rotary simulation unit through the signal processing unit;
and the rotation simulation system outputs a rotation simulation signal according to the excitation signal, and converts the rotation simulation signal into a rotation simulation test signal suitable for being received by a motor to be tested through the signal processing unit.
In some optional implementations of this embodiment, the rotary transformer simulation unit further includes a network communication unit for performing remote communication with the signal processing unit and communicating with an external device.
The embodiment of the invention can solve the problems in the prior art, improves the universality and the stability, and has the characteristics of good compatibility, test safety and high test precision. The simulation method of the embodiment of the invention can provide simulation of various rotation simulation signals.
It should be noted that, the specific flow of the method for simulating the rotation-varying signal provided by the embodiment of the present invention is similar to the working principle of the above-mentioned system for simulating the rotation-varying signal, and the relevant points can be referred to the above description and will not be repeated here.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (7)
1. A rotation signal simulation device, comprising: a rotation simulation unit and a signal processing unit, wherein
The rotation simulation unit is used for outputting rotation simulation signals according to the input excitation signals;
the signal processing unit is configured to receive and process an excitation test signal output by a motor to be tested to generate the excitation signal suitable for being received by the rotation simulation unit, and receive and process the rotation simulation signal output by the rotation simulation unit to generate a rotation simulation test signal suitable for being received by the motor to be tested, where the signal processing unit includes:
the first processing unit is used for receiving and processing an excitation test signal output by the motor to be tested to generate the excitation signal suitable for being received by the rotary transformer simulation unit, and the excitation signal is positioned in the input voltage range of the rotary transformer simulation device;
the second processing unit is used for receiving and processing the rotation simulation signals output by the rotation simulation unit to generate rotation simulation test signals suitable for being received by the motor to be tested, and the rotation simulation test signals are positioned in the input voltage range of the motor to be tested;
wherein, the spiral change simulation unit includes:
the analog-to-digital conversion unit is used for performing analog-to-digital conversion on the received excitation signal and outputting a digital excitation signal;
the rotary simulation device is used for receiving the digital excitation signal, simulating and outputting a digital rotary simulation signal, the rotary simulation device is Xilinx-XC5VLX30, and the digital rotary simulation signal output by the rotary simulation device is used for simulating signals output by different coding modes and different types of rotary encoders;
the digital-to-analog conversion unit is used for carrying out digital-to-analog conversion on the received digital rotary-to-analog simulation signal and outputting the rotary-to-analog simulation signal.
2. The apparatus of claim 1, wherein the rotational-transformation simulation unit further comprises a network communication unit for communicating with the signal processing unit and with an external device.
3. The apparatus according to claim 2, wherein the first processing unit includes a first filtering unit and a first operational amplifier unit, clutter of the excitation test signal is filtered by the first filtering unit, and the excitation signal suitable for being received by the rotation simulation unit is reduced or amplified by the first operational amplifier unit; and
the second processing unit comprises a second filtering unit and a second operational amplifier unit, clutter in the rotation simulation signal is filtered through the second filtering unit, and the clutter is reduced or amplified through the second operational amplifier unit to output the rotation simulation test signal which is suitable for being received by the motor to be tested.
4. The apparatus of claim 2, wherein the rotation-varying simulation signal comprises a sine signal and a cosine signal.
5. A system for simulating a rotary signal, comprising a control terminal and a simulation device according to any one of claims 1-4,
the control terminal is used for sending a control instruction to the simulation device to control the motor to be tested of the simulation device to output an excitation test signal to the signal processing unit, converting the excitation signal into an excitation signal suitable for being received by the rotation simulation unit through the signal processing unit and transmitting the excitation signal to the rotation simulation unit, so that the rotation simulation unit outputs a rotation simulation signal to the signal processing unit according to the excitation signal, converting the excitation signal into a rotation simulation test signal suitable for being received by the motor to be tested through the signal processing unit and transmitting the rotation simulation signal to the rotation simulation unit.
6. The system of claim 5, wherein the emulation system further comprises a switch for exchanging and transmitting data between the control terminal and the emulation device.
7. A method of performing a spiral-change signal simulation using the spiral-change signal simulation system of any of claims 5-6, comprising:
the control terminal sends a control instruction to a motor to be tested of the simulation device;
the motor to be tested outputs an excitation test signal and transmits the excitation test signal to the signal processing unit, and the excitation test signal is converted into an excitation signal suitable for being received by the rotary simulation unit through the signal processing unit;
and the rotation simulation system outputs a rotation simulation signal according to the excitation signal, and converts the rotation simulation signal into a rotation simulation test signal suitable for being received by a motor to be tested through the signal processing unit.
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| CN102156263A (en) * | 2011-04-02 | 2011-08-17 | 华中科技大学 | Excitation system simulation test device for synchronous generator |
| CN109521755A (en) * | 2019-01-21 | 2019-03-26 | 苏州华兴源创科技股份有限公司 | A kind of analogue system, rotation become test macro and rotation becomes test method |
| CN209878873U (en) * | 2019-01-24 | 2019-12-31 | 中广核工程有限公司 | Excitation voltage isolation sampling circuit and generator excitation system simulation tester |
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