Inductor current sensing scheme for PWM regulator

Details Inductor current sensing scheme for PWM regulator Inductor current sensing scheme for PWM regulator

2006-09-12

2006-09-12

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

Reexamination Certificate

active

07106035

ABSTRACT:
An inductor current measurement scheme generates an output voltage as a function of inductor current in a pulse width modulation-based DC—DC voltage converter. The converter has an upper controlled switch and a lower controlled switch coupled in series between an input voltage terminal and a reference voltage terminal. A common connection of the upper controlled switch and the lower controlled switch provides a phase node voltage. An inductor L and a parasitic direct current resistance (DCR) are coupled between the phase node and an output node coupled to a load. The scheme generates a sense current as a function of the difference between the phase node voltage and the output voltage. This sense current is then supplied to a resistor-capacitor network comprised of a resistor Rs and a capacitor Cs, wherein the product of Rs*Cs=L/DCR, so as to produce a voltage across the resistor-capacitor network that is proportional to the inductor current.

REFERENCES:
patent: 5982160 (1999-11-01), Walters et al.
patent: 6646450 (2003-11-01), Liebler
patent: 6812677 (2004-11-01), Walters et al.
patent: 6833690 (2004-12-01), Walters et al.
patent: 6870352 (2005-03-01), Walters et al.

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