基于PLC的高功率充电电源的设计与控制系统实现
[Abstract]:With the development of national defense laser weapon and the increase of pulse energy, pulse laser system becomes more and more important. The charging power of laser power supply is an important part of experimental laser system. The capacitor of laser is charged to the required voltage. The early laser charging power supply basically uses the DC power supply composed of voltage regulator and rectifier circuit to realize the charge control of the laser capacitor, but in recent years, the volume of the laser charging power supply is greatly reduced because of the switching power supply technology. However, the power supply control is difficult, the reliability is low, and the pulse frequency range is limited, which makes the laser system unable to realize the high power pulse energy. In this paper, the high power charging power supply based on PLC and its control system are studied. The power supply is quite different from the previous charging power supply, and contains a charging splitter and a number of energy storage capacitors. A semiconductor switch is connected to each capacitor discharge loop. The charging extension charges the energy storage of several energy storage capacitors in advance, and then transfers the energy of the energy storage capacitors to the laser capacitors one by one through the resonant inductance series resonance, and controls the circuit by De-Q. The charging voltage of laser capacitor is accurate. The semiconductor switch, which uses the latest technology inside the power supply, replaces the former thyristor switch, and makes the working life of the power supply increase greatly. The whole power supply has high efficiency, high power and accurate charging voltage. In the process of charging the power supply, the electromagnetic energy storage of the resonant inductor is 50 kJ, which is difficult to realize in engineering. In this paper, the design and calculation method of inductor is given in detail. The charging extension adopts series resonant full-bridge inverter technology and soft switching technology of power switch tube. It outputs in a constant current mode, realizes zero current turn-on and zero voltage turn-off of power switch tube, and reduces switching loss. In this paper, the working characteristics and mode of full-bridge inverter of series resonance are analyzed in detail, especially the influence of distribution parameters of high-frequency transformer on resonance. The design of parameters, simulation and experimental waveforms are given. At the same time, the De-Q control circuit is analyzed in detail, and the parameter design, simulation and experimental waveform are given. The control system adopts Siemens PLC as the core controller to realize the work flow, state indication, parameter setting and fault protection of the power supply. Remote control is developed with VB software. According to the function requirement of power supply system, the software flow chart of the system is given, and the hardware and software design of the control system is completed. The test results show that the high power charging power supply and control system are reliable, stable and correct, and the total charge energy, single charge energy and average charge power are 3 MJ, 0.1 MJ and 1.2 MW respectively.
【学位授予单位】:电子科技大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TN86;TP273
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