-3 Single Phase-Three Phase Combined Using Type Conversion Circuit and Vehicle-mounting type charger

摘要

The present invention discloses a single-phase three-phase combined conversion circuit, which includes an EMC module, a PFC module, a switch K1 and a control module, wherein the EMC module is A, B, C, N lines of the power grid and the PFC module The three lines A1, B1, and C1 connected between and drawn out by the EMC module are connected to the PFC module, and the three lines A1, B1, and C1 are connected to the virtual midpoint installed through capacitors CX1, CX2 and CX3, respectively. and the virtual midpoint is connected to the midpoint of the bus bar of the PFC module through the switch K1, and the control module is used to detect the power grid input signal and control the state of the switch K1 based on the type of the power grid input signal do. By using the technical solution of the present invention, it is possible not only to reduce the common mode noise in the three-phase conversion mode, but also to ensure that a control method with a relatively large bus voltage adjustment range can be used in the three-phase conversion mode; Even when switching to single-phase conversion mode, the influence of common-mode noise on the DC side on input type EMC can be reduced.