連續(xù)模式單級PFC反激式變換器的研究與設(shè)計
[Abstract]:With the increasingly stringent standards, the design of switching power supply is facing more and more challenges. The mandatory requirement of power factor (PF) or harmonic content becomes more and more popular with the increasing of equipment power. The power factor correction (PFC) technique can improve the utilization rate of the current in the line, reduce the harmonic component of the current, and improve the power factor of the electric equipment. Single-stage PFC flyback converters are widely used at present. At present, the related structures in the market include the following two types: the first is critical mode single-stage PFC flyback converters, which are usually used in peak current control mode. The structure and complexity of the circuit are basically the same as those of the common flyback converter, and the cost of the circuit is very low. Because the system works in critical mode, the peak current of inductor and switch is large, so it is more suitable for low power applications. The second one is continuous mode single-stage PFC flyback converter. This kind of structure usually adopts average current control mode and is more suitable for medium power (about 100W). However, the control mode of this structure is more complex, the circuit cost is high, and special control IC. is needed. In this paper, a third type of single-stage PFC flyback converter is proposed, which has the advantages of the two converters mentioned above. This control mode uses a fixed switch off time and realizes the continuous mode. Allows the system to use a simple and inexpensive peak current control mode. Compared with the intermittent mode, this structure can effectively reduce the peak current of the switch, secondary output diode and inductor, alleviate the high harmonic current stress of the former EMI filter, and compare with the average current control mode, at the same time, compared with the average current control mode, this structure can reduce the peak current of the switch tube, the secondary output diode and the inductor. This kind of structure does not need the special control chip, the circuit structure is relatively simple, the cost is relatively low. In this paper, the critical mode and the continuous mode are compared, and the large signal modeling of the single-stage PFC flyback converter with fixed turn-off time control mode is completed. At the same time, the system circuit is designed, and the feasibility of the structure is verified by simulation. Finally, the prototype is designed and manufactured, and the theory is verified by the prototype.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TM46
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