Circuit and method for capacitor effective series resistance...

Details Circuit and method for capacitor effective series resistance... Circuit and method for capacitor effective series resistance...

2011-03-01

2011-03-01

Dole, Timothy J (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S678000, C324S659000, C324S548000

Reexamination Certificate

active

07898268

ABSTRACT:
A circuit and method for capacitor effective series resistance measurement. One embodiment provides a method for measuring the effective series resistance of a capacitor having a capacitor voltage. The method includes amplifying the capacitor voltage with an AC coupled amplifier yielding a first amplified signal. The capacitor is discharged with a constant current for a measurement time thus causing a voltage swing of the capacitor voltage due to a voltage drop across the effective series resistance. The capacitor voltage is amplified with the AC coupled amplifier yielding a second amplified signal being dependent on the voltage swing. The effective series resistance is calculated from the first and the second amplified signals.

REFERENCES:
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patent: 2005/0270042 (2005-12-01), Doljack
patent: 2007/0030016 (2007-02-01), Schumacher et al.
patent: 2007/0115006 (2007-05-01), Anude et al.
patent: 2008/0204049 (2008-08-01), Kawate et al.
SLVA061 “Understanding Boost Power Stages in Switchmode Power Supplies”, Application Report (Texas Instruments) Mar. 1999, pp. 1-28.

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