Patent ID: 7969694
Filing Date: 2011-06-28
Classification: H02M,Y02B

Abstract:
1. A power-processing device, comprising: a first system input configured to be coupled to a diode and an inductor of a power supply circuit; a first resistor comprising a first terminal coupled to a switch, and a second terminal coupled to the first system input, wherein the resistance of the first resistor is of a same order of magnitude as an on-resistance of the switch; a second resistor comprising a first terminal coupled to a first current source, and a second terminal coupled to the first system input; and a comparator with a first input terminal coupled to the first terminal of the first resistor and a second input terminal coupled to the first terminal of the second resistor, wherein the comparator asserts an output signal when a voltage difference between the first and second input terminals of the comparator crosses a threshold.