Patent ID: 7456695
Filing Date: 2008-11-25
Classification: G01R,H04B

Abstract:
1. A cross-coupled phase-lock-loop filter (CCPLL) for tracking a signal of an electric grid, the CCPLL comprising: a plurality of PLL filters, wherein an input for a first PLL filter in the plurality of PLL filters comprises the signal of the electric grid minus an output signal from at least a second PLL filter in the plurality of PLL filters wherein the first PLL filter comprises: a synchronous frame phase-lock-loop circuit comprising a d-axis signal output and a q-axis signal output, wherein at least one of the d-axis signal output and the q-axis signal output are coupled to at least one signal filter, and an output of the at least one signal filter is further coupled to a circuit for providing a reverse-transformation of the output of the at least one signal filter to provide a reverse transformation signal.