RIPPLE FILTER CIRCUIT AND RIPPLE FILTER METHOD

摘要

A method of filtering a ripple can include: (i) generating, by a sampling circuit, a sense voltage signal that represents an output current flowing through a load; (ii) generating, by a filter circuit, a filter voltage signal by filtering the sense voltage signal, where the filter circuit includes a switch capacitor circuit and a filter capacitor; and (iii) generating, by an error amplifying circuit, an error compensation signal by amplifying a difference between the sense voltage signal and the filter voltage signal, where the error compensation signal is configured to compensate and regulate the output current flowing through the load by controlling a power switch that is coupled to the load and the sampling circuit.

主权项

1. A method of filtering a ripple, the method comprising:
a) generating, by a sampling circuit, a sense voltage signal that represents an output current flowing through a load; b) generating, by a filter circuit, a filter voltage signal by filtering said sense voltage signal, wherein said filter circuit comprises a switch capacitor circuit and a filter capacitor; and c) generating, by an error amplifying circuit, an error compensation signal by amplifying a difference between said sense voltage signal and said filter voltage signal, wherein said error compensation signal is configured to compensate and regulate said output current flowing through said load by controlling a power switch that is coupled to said load and said sampling circuit.