AC/DC CONVERTER WITH NEUTRAL VOLTAGE LIFT CAPACITOR

摘要

Some embodiments are directed to an AC/DC converter comprising a first AC terminal for connection to a first AC circuit terminal, a neutral line terminal for connection to a neutral AC circuit terminal, a common node, a first AC side active bridge coupled between the first AC terminal and the common node, and a neutral voltage lift capacitor coupled between the neutral line terminal and the common node. The converter comprises first and second DC terminals, and a capacitor between the first and second terminals. A DC-side active bridge is coupled between the first and second terminals. An inductor is coupled between a switchable nodes of the first AC side active bridge and the DC side active bridge. A controller is arranged to control the first AC side active bridge and the DC-side active bridge so to alternate voltage across the first AC terminal and the neutral line terminal.

主权项

1. A bi-directional AC to DC converter comprising:
a first AC terminal for connection to a first AC circuit terminal; a neutral line terminal for connection to a neutral AC circuit terminal; a common node; a first AC side active bridge coupled between the first AC terminal and the common node; a neutral voltage lift capacitor coupled between the neutral line terminal and the common node; a first DC terminal; a second DC terminal; a buffer capacitor arranged between the first DC terminal and the second DC terminal; a DC-side active bridge coupled between the first DC terminal and the second DC terminal; a first inductor coupled between a switchable node of the first AC side active bridge and a switchable node of the DC side active bridge; a controller arranged to control the first AC side active bridge and the DC-side active bridge so that an alternating voltage across the first AC terminal and the neutral line terminal is converted to and from a direct voltage across the first DC terminal and the second DC terminal.