Patent ID: 8031497

Claim:
A three-leg power converter apparatus, comprising: a first input/output port, a second input/output port, and a third input/output port with each of them having two terminals; a three-leg bridge converter having three single-leg circuits, two DC terminals connecting with the two terminals of the first input/output port, and three mid-terminals, with each mid-terminal being located at a middle point of one of the three single-leg circuits; a controller electrically connecting to the three-leg bridge converter for controlling an input or output current passing through each DC terminal and mid-terminal; a filter circuit having one side connecting to two of the mid-terminals of the three-leg bridge converter and another side connecting to the two terminals of the second input/output port; and a decoupling circuit having a first terminal and a second terminal respectively connecting to the two terminals of the second input/output port and a third terminal connecting to one of the two terminals of the third input/output port, with the other terminal of the third input/output port connecting to the other mid-terminal that dose not connect with the filter circuit.