Current sensing in multiple coupled inductors by time...

Details Current sensing in multiple coupled inductors by time... Current sensing in multiple coupled inductors by time...

2007-06-19

2007-06-19

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S290000

Reexamination Certificate

active

11341874

ABSTRACT:
Voltage regulators often have coupled output inductors because coupled output inductors provide improvements in cost and efficiency. Coupled inductors are often used in multi-phase voltage regulators. Feedback control of voltage regulators often requires accurate and responsive sensing of output current. Provided is a technique for accurately sensing the magnitude of output current in coupled inductors. An RC circuit (comprising a resistor and capacitor in series) is connected in parallel with the coupled inductor. The inductor has a leakage inductance Lk and a DC (ohmic) resistance of DCR. The resistor and capacitor are selected such that an RC time constant is equal to an L/R time constant of Lk/DCR. With the matching time constants, a sum of voltages on the capacitors is accurately proportional to a sum of currents flowing in the output inductors. Also provided is a technique for sensing current when an uncoupled center tap inductor is present.

REFERENCES:
patent: 5982160 (1999-11-01), Walters et al.
patent: 6469481 (2002-10-01), Tateishi
patent: 6897641 (2005-05-01), Herbert
patent: 7026798 (2006-04-01), Cheung et al.
patent: 7106035 (2006-09-01), Xing

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