| As a kind of power device, switching power supply is widely used in various kinds of electronic equipments, its quality would directly affect the technical performance, security and reliability of the instruments. The electrical performance test and aging test of the power supply products are two important processes to ensure the quality and working stability of the products. With the rapid development of industry electronic instruments and consumer electronics, the production of power supply has become an important branch of electron industry. However, the traditional manual test method of power supply is so inefficient that cannot meet the requirements of high-speed, high-precision and mult-function test in large batch production of different specifications. The fact that plentiful power supplies use resistor to deplete their energy in aging test, not only results in huge energy waste, but also brings about serious thermal pollution to production environment. Besides, the aging system has a poor adaptability for the test of different capacity power supplies. Therefore, it is very important to research and develop new performance test method and energy-saving aging technology for DC power supplies.By means of comprehensive analyzing the operation principle and the characteristics of electrical performance test of DC switching power supply, and according to the national standards and the test requirements in massive production, the paper develops a new DC Power Supply Automatic Test Systems(ATS) based on virtual instruments technique,and designed by a graphical programming language──LabVIEW. Withthe integrated design technology of system software and hardware, it has realized the function of ripple test and combination mode test of constant-current, constant-voltage, over-current, short-circuit etc. The design process of the software and hardware is narrated in detail, and an in-depth analysis on the control method and measuring precision of the system is also presented in this thesis. On the basis of researching the method, situation and control requirement of the energy-saving aging test system based on modern power electronic techniques, a new solution of energy-saving aging test which contains energy-collect and energy-feedback is designed for the lower power supplies. Two control circuit projects of high-frequency PWM inverter are constructed in this paper, and their control effectiveness are researched and compared by the simulation function in Matlab, meanwhile, the system parameters of two projects are analyzed and optimized.Both the actual application and simulation show: the power supply ATS, which based on virtual instrument techniques, has advantages of good performance, high measure speed, easy operation and good compatibility, thus it can meet the requirements of long-time and uninterrupted automatic test in large-batch production. The solution of the energy-saving aging test of power supply can accurately control the aging current, and has the characteristics of low harmonic pollution and high power factor, and the energy recovery rate of aging test system can reach 80%. The whole test system has reached the design target of high performance-to-price ratio, and possesses great value of popularization and application. |
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