2 Huazhong University of Science and Technology Wang Yongzheng Zeng Ming Xu Guiying Dongfang Motor Co., Ltd. Chen Linli method and key questions in the design of the host computer, proposed some better solutions 1 Introduction With the rapid development of electronic counterparts, computer-aided test system 喔 1 Asahi 618, is being widely used for 1 month. , defense. In many fields such as scientific research, its main role is to collect and process the physical parameters of the objective world at three points, and to control the controlled objects in order to achieve the intended synchronization. In the control of generator set, the excitation system is an important equipment, and its performance is closely related to the working performance of the generator set. Therefore, it is of great significance to the factory inspection and online test of the excitation system. At present, the detection of the excitation system in China is mostly adopted. 1 test method, using a conventional instrument such as a knife with a small 1 leather device, recording and analysis by manual reading, so there are short test cycles, low test accuracy and artificial strength. In order to improve this situation, we have developed a set for excitation. A computer-aided test system for the test device to improve the test level of the excitation system. 2 system overall scheme The system consists of three parts, phase voltage and current source with adjustable frequency value controlled by single chip microcomputer, external signal acquisition and processing unit, 1 micro computer system, including the overall structure of microcomputer printer and signal acquisition card system. Box 1 phase 8 inverter voltage source current source MCU system printer computer system signal pre-processing signal detection card system working principle as follows: phase voltage source gun flow source adopts single factory machine control, cross rendering inversion mode, 3 signal modulation, The operating condition of the analog step generator is connected to the input end of the excitation device. The computer system controls the power supply by communicating with the single chip microcomputer. The signal to be detected on each template of the excitation device passes through the front. After processing, it is sent to the signal detection card, and after being converted by the person 0, the result is transmitted to the bit microcomputer for data processing. Analyze and output the test curve and the main functions that should be completed by the test computer system. For example, it can cooperate with the exciting system test with the dense power supply for the National Natural Science Foundation of China 69974417, the Hubei Provincial Natural Science Foundation Project 9 and 015 and the China Scholarship Council The open-loop test of each operating channel of the returning personnel fund-funded system can detect the input and output signals of each function template of the excitation control device, and complete the drawing of the relationship between the voltage turbulence voltage, the current frequency, the voltage pulse, the firing angle, the current pulse firing angle and the like. It can measure the active power monthly reactive power and calculate the power factor. It can simulate the operation condition of the hair dryer and carry out the simulation test of the operating conditions such as the Asahi load. The real-time test curve and the knot can be combined with the single-chip system to enter the hall in real time. The film can be tested by the single-chip system for the excitation system. The power supply performs remote operation and control. 61 can generate and print a variety of different reports according to the same test 3 signal detection part of the implementation of the signal detection part mainly includes the signal pre-processing box and signal acquisition, 1 card, through which the external signal into the office. It is converted into a digital signal input computer. The external signals to be detected mainly include six kinds of common ground signals, common ground signals, and common DC signals, which are not common DC signal pulse signal switching signals. The range of the size of each signal is also different, from a few hundred millivolts to tens of volts, even hundreds of volts, and the number of signals to be detected is large, a total of 64 channels of AC signals, 40 channels of DC signals, 12 channels of pulse signals 1 and 1.6 are measured. Road opening; No. 1, plus 16 alternate channels, a total of 148 channels, except that the same channel signal can be used because it does not need to measure at the same time. In total, it is also necessary to measure the signal acquisition of 0 channels. The way the road is selected, a dozen pieces are used in the signal pre-processing box. 4051 for multi-channel signal selection The strobe of these 004051 is realized by the address strobe circuit of the acquisition card. The address selection power-on routing consists of two 745138 decoders, so that 288=128 signals can be selected to meet the system requirements in the signal pre-processing box. The 04051 output is connected to the chip on the capture card, on the input of 04051. When the signal needs to be measured, the lower level 004051 and the upper 405 corresponding to the signal can be strobed to input the signal into the programmable amplifier. The programmable amplifier can The measured multiples of different sizes are converted to the system. The level is old, while the control is multiplied, the latch selects the converted signal, and the 0 converts to a digital signal. The capture card is inserted into the 13-person bus slot of the computer to exchange data with the computer through the bus. The overall meaning of the signal detection part 2. The two lines of the same signal are respectively connected to the input terminals of the two pieces of 4051, and the outputs of the two pieces of 4051 are respectively connected to the two input ends of the differential operational amplifier. Detecting the signal of the common ground by using the rms measurement circuit. For the common ground signal, only the slice 4051 can be used to select the detection pulse signal, and the pulse is converted into a standard square wave with the same width and frequency of the same pulse signal. The amount of DC that reflects the amplitude of the pulse, the width of the detected square wave and the DC voltage are small, that is, the signal of the pulse is known to be able to achieve the isolation detection of the switch with high voltage and the switching amount. Long-line transmission of the signal, and then only need to detect the level of the signal after isolation to obtain the switch state to ensure the accuracy of signal detection. The melon conversion chip uses 12-bit into 0 chip people 0574 to make the given signal in the system test directly from the computer. Control, the capture card also has two pieces of 0 people 0,832, can provide two-way test simulation 0 No. 4 software design program Mountain in the test system to complete the test species have a few, need to show After comparison, the system software was compiled with 8 cents 1 + 5.0 in the Chinese environment 95 environment. The function and design method of each module of system software structure block 3 are as follows: 1 man-machine interface design. Since the user of the software is a lot of different testers, the interface is friendly and intuitive, and the disc is easy to use. Utilize, the Chinese-language dynamic link library in + can design the interface of the command. And in the status bar at the bottom of the screen gives the corresponding mention of each step, while at the same time can be (1) dynamic menu and dialog box, so that users simply select the menu items in the menu and dialog box by moving and pressing the mouse, You can complete the operation. This minimizes manual typing, which reduces errors and increases efficiency. For the collected data, the dynamic display can be realized by refreshing the screen, and the corresponding curve signal acquisition and processing program can be drawn at the same time as the data is displayed. The sequence is mainly for reading and writing control on the signal detection card, and reading and decoding the address. The operation of the device, that is, the operation of the hardware port, because the signal acquisition card is a microcomputer expansion plug-in board, such as the plug-and-play fast specification of Sishen 895, the need to write the corresponding driver dragon will make the development complicated. Therefore, the method of writing a 32-bit dynamic link library of a microcomputer port read/write function by using 0+ can be used to realize the read/write input and output port, and the method is simple and practical. 3 report generation and printing procedures. Due to the wide variety of tests involved in the test, the reports are different, so the multi-document template structure provided in + can be used to make each test correspond to a template, have their own document frame and view, and provide different menus for different experiments. Therefore, each test has relative independence, can meet different requirements, and is very flexible. At the same time, there are only two reports for each test, which can be easily displayed. Print preview and printing, multi-document template structure, can also save the test data corresponding to different experiments in different suffix file names, so when you need to query, just double-click the file name in the resource manager of the boundary 95 The corresponding 4 serial communication program can be opened. This program is mainly used for the 32-bit serial communication in the communication industry between the microcomputer and the single-chip microcomputer. The serial communication in the 3.1 and 003 is very different. It is possible to use the multi-thread to realize the process. Initialization work. Then the main thread plays according to the needs, and when appropriate, the new communication monitors the thread, and the communication thread monitors the communication port. When there is data input, it sends a boundary message to the main thread, and the main thread processes it and reads the valid data. Thus, the host computer and the station machine do not affect the upper level while communicating in real time. The machine performs other operations. 5 Conclusions (1) Excitation test device computer aid test system, NPC shortens the test time of the excitation system, improves the test accuracy, and reduces the labor intensity of labor, overcoming the shortcomings of manual test. The hardware and software design methods provided in this paper can also be used in the design of other computer-aided test systems. Microcomputer interface technology and applications. Huazhong University of Science and Technology Press, 2 Kingdom translation. Xian 1 + technology insider. Tsinghua University Press, 1996 3 Zhao Ren Ren translation. Become a programmer's guide. Tsinghua University Press, 1995, 61670 AC drive provides high performance and flexibility in a compact package. The new 45170 parent-flow inverter series is 13 6 out; inverter 豕 family of low power of the Bay 15, you, 70 parent flow inverter series in the compact panel-mounted armor The river has the characteristics of the configuration in the application field. Such as volts. Hertz or vector control features without sensors. Thermal performance with almost no action The active thermal management program of this 70 AC drive recognizes the overload condition and makes internal adjustments to reduce the overheating of the inverter against the shutdown. 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