Patent ID: 6930474
Filing Date: 2005-08-16
Classification: H02M,Y02B

Abstract:
1. A current sense apparatus using a combination of a simulation and a real sense for generating a current sense signal for a switching mode DC-to-DC power converter having a high-side transistor connected between an input voltage and an output node, and a low-side transistor connected between the output node and a reference potential, to provide an output voltage and an output current from the output node through an inductor, the apparatus comprising: a ramp signal generator for generating a ramp signal with a slope proportional to a difference between the input and output voltages during each first half cycles of a clock; a DC signal generator for generating a DC signal proportional to a DC component of a current through the low-side transistor by measuring the current through the low-side transistor; and a summing circuit for combining the ramp and DC signals to generate the current sense signal.