Patent ID: 7429831

Claim:
A balance controlling circuit, comprising: a transformer having an input, a first output, and a second output, wherein the input is configured to connect to an external circuit, and the first output is configured to connect to ground; a first capacitor having a first port and a second port, wherein the first port connects to the second output of the transformer; a second capacitor having a first port and a second port, wherein the second port is configured to connect to ground, and the first port connects to the second output of the transformer; a first inductor having a first port, a second port, a third port, and a fourth port, wherein the first port and the third port of the first inductor connect to the first port of the first capacitor; and a second inductor having a first port, a second port, a third port, and a fourth port, wherein the third port of the second inductor connects to the second port of the first inductor, and the first port of the second inductor connects to the first port and the third port of the first inductor and the first port of the second capacitor respectively; wherein the fourth port of the first inductor is configured to be a first output port, the fourth port of the second inductor is configured to be a second output port, and the second port of the second inductor is configured to be a third output port.