Abstract

This paper presents a new four-quadrant bridgeless boost type rectifier with the use of Active Virtual Ground (AVG) technology. The presented topology can step up the AC grid voltage to a regulated DC voltage under a stable bidirectional current flow with real power or reactive power delivery. By using bridgeless rectifier configuration and 3-level switching method, only two high frequency switches are required through the four-quadrant operation. Small input current ripple is guaranteed by the AVG circuit. A high efficiency system is also able to be guaranteed by low semiconductor loss. Benefit from the AVG technology, a LCL filter is formed at the input during the operation. The filter capacitor clamps the voltage ripple between the grid and the DC bus terminal. Hence the leakage current in the bridgeless PFC is minimized and causes a low common-mode (CM) noise system. The differential-mode (DM) noise is also maintained in a small value due to the small grid current ripple. Finally a high efficiency and low noise four-quadrant rectifier is built. The presented topology is successfully implemented on a 750W prototype and the performance is experimentally verified which show a good agreement with the theoretical knowledge. The operation principles and the controller implementation are also described in details.

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