Multi-port PFC converter and current sensor-free control strategy thereof

The invention discloses a multi-port PFC (Power Factor Correction) converter. The multi-port PFC converter is composed of an input AC (Alternating Current) power supply, an input filter, a diode rectifying circuit, a buck-boost converter and a multi-path dc-dc converter. Meanwhile, the invention also provides a control strategy which does not need a current sensor and is based on the multi-terminal PFC converter. According to the multi-port PFC converter and the control strategy provided by the invention, the synchronization of an input side power grid and the control of the PFC converter can be realized without any current sensor while the high electric energy quality, the high power factor and the multi-port output of the input current can be realized, so that the cost of the system is greatly saved. 本发明公开了一种多端口PFC变换器，该多端口PFC变换器由输入交流电源、输入滤波器、二极管整流电路、buck-boost变换器及多路dc-dc变换器组成。同时本发明还提供了一种基于此多端PFC变换器的无需电流传感器的控制策略。本发明提供的多端口PFC变换器及控制策略可实现输入电流高电能质量、高功率因数及多端口输出的同时，无需任何电流传感器即可实现输入侧电网的同步及PFC变换器的控制，因此极大地节约了系统的成本。