| Nowadays, the electronic power equipments are widely used in power system, industrial, household and other aspects. With bring benefits to humanity but also produce the problems of harmonic pollution. The Power Factor Correction (PFC) technology emerged as the times require, and showed its good performance gradually, which evolved into the most important research focus in modern power electronics area. Power Factor Correction technology can shape line current and eliminate the undesirable effects on power network by the line current harmonics. Consequently it is an effective method of restraining harmonic currents and increasing power factor.In power supply and electrical equipments often use a front-end full-bridge diode rectifier to exchange AC into DC, and combine the boost converter as the main circuit structure, then through the PFC stage realizes power factor correction function. Generally, there are on-state losses that brought by the two rectifier diodes in the main circuit structure with rectifier at any time. With improving of the power level, the loss of bridge rectifier occupies a quite large proportion in the whole power stage loss, which seriously limits its application in the high-power occasions. Thereby adopting bridgeless PFC topology has an important significance to improve the overall system efficiency.This research introduces some commonly topologies of APFC circuits. Furthermore, several relevant control strategies were clarified. In addition, the bridgeless power factor converter based on the IC UC3854chip that using the average current control was proposed. Then article developed a250W experimental prototype and presented the control diagram of system. According to the requirements of design, all the circuit components’parameters were calculated. Application of MATLAB software, the circuit was simulated to verify the reliability of the parameters.Finally, the experimental prototype was debugged and the corresponding experimental waveforms were given. The experiment results prove the good performance of the bridgeless PFC converter. |
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