Patent ID: 9742309
Date: 2017-08-22
CPC Classifications: G01R,H02M,Y02B

Claim:
1. A waveform shape discriminator, comprising a running maximum finder circuit coupled to receive an input sense signal that is representative of an input of a power converter, wherein the running maximum finder circuit is further coupled to receive a zero crossing signal, wherein the running maximum finder circuit is coupled to update a running maximum signal in response to the input sense signal and the zero crossing signal; a scaling circuit coupled to receive the running maximum signal from the running maximum finder circuit to generate a running maximum threshold signal in response to the running maximum signal, wherein the running maximum threshold signal is a scaled representation of the running maximum signal; a first comparator coupled to receive the input sense signal and the running maximum threshold signal that is representative of the running maximum signal; a search window block coupled to receive the input sense signal to detect a search window in the input sense signal, wherein the search window block comprises a zero crossing detector coupled to output the zero crossing signal, wherein the running maximum finder circuit is coupled to output the running maximum signal representative of a maximum value of the input sense signal in the search window as defined by the zero crossing signal; and an output circuit coupled to output a shape signal in a presence of a waveform shape of the input sense signal, wherein the shape signal has N number of values, and each of the values corresponds to a shape.