| Three-phase power factor correction techniques are widely used,and it is one of the most effective methods to reduce harmonic current and improve power factor. Especially in UPS and high-power switching power supply, it is applied. Single-phase PFC has been developed in low electronics field. Three-phase PFC has been more and more popular due to its advantages including low cost,simple circuits construct, and convenient control. Three-phase PFC has broad prospects to be applied.A single-stage PFC converter combines the PFC stage and a DC/DC converter into one stage with a shared switch and controller. It reduces cost and simplify the control method。The paper introduces two full bridge three-phase single-stage PFC-DC/DC converters, Two topology models both operate in discontinuous conduction mode(DCM), the peak of input current follows the input voltage automatically. The electrical isolation between input and output sides is achieved and output voltage regulation can be achieved as well as power factor correction. The soft-switching(zero-voltage-switching)of four switches can be realized. The working principle of two topologies has been given in this paper. Based on Matlab software simulation, the correctness of the theoretical analysis is verified.The merits of digital control include simple hardware, flexible control and easy to realize advanced arithmetic etc. In the current it is popular to use digital control in APFC circuit. Phase shift control can be realized by using digital signal processors(DSP).Finally, based on full bridge three-phase single-stage PFC-DC/DC converter, with a core of TMS320F2812 DSP, the parameter is calculating and software program is debugged. The three-phase single-stage PFC-DC/DC converter has been built to verify the theoretical analysis. |
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