Patent ID: 7795846
Filing Date: 2010-09-14
Classification: H02M

Abstract:
1. A switching circuit for converting an input voltage into an output voltage, comprising: an input terminal for receiving the input voltage, a power switching element coupled to the input terminal and having duty cycle d controllable to adjust the output voltage with respect to a desired level using inductor current representing current in an inductor element connectable to the power switching element, an average and hold circuit responsive to a voltage at an output of the power switching element to produce an average switch voltage over an ON phase of a switching cycle of the power switching element; a voltage-to-current converter responsive to the average switch voltage for producing representation of an average inductor current over one or more switching cycles of the power switching element; and a current modulator having a duty cycle equal to 1-d for modulating the representation of the average inductor current to produce a signal proportional to an average output current of the switching circuit over one or more switching cycles of the power switching element.