Patent ID: 9712053
Date: 2017-07-18
CPC Classifications: G05F,H02M

Claim:
1. A method of determining output inductor current for a DC-DC switching regulator including a bypass switch coupling ends of the output inductor and an output capacitor, the output inductor having one end coupled to a node between a high side switch and a low side switch coupled in series and another end coupled to the output capacitor, comprising: digitizing a first voltage of a node between the output inductor and the output capacitor at a first time to obtain a first digital output capacitor voltage; storing an indication of the first digital output capacitor voltage; digitizing a second voltage of the node between the output inductor and the output capacitor at a second time to obtain a second digital output capacitor voltage; determining a first value indicative of output capacitor current based on the indication of the first digital output capacitor voltage and the second digital output capacitor voltage; digitizing a third voltage of the node between the output inductor and the output capacitor at a third time to obtain a third digital output capacitor voltage; storing an indication of the third digital output capacitor voltage; digitizing a fourth voltage of the node between the output inductor and the output capacitor at a fourth time to obtain a fourth digital output capacitor voltage; determining a second value indicative of output capacitor current based on the indication of the third digital output capacitor voltage and the fourth digital output capacitor voltage; and determining an indication of output inductor current based on the first value indicative of output capacitor current and the second value indicative of output capacitor current to obtain an indication of output inductor current; wherein the bypass switch is open at the first time and the second time and the bypass switch is closed at the third time and the fourth time.