Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Magnetic saturation
Reexamination Certificate
2007-12-11
2007-12-11
Hollington, Jermele (Department: 2829)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Magnetic saturation
Reexamination Certificate
active
11372567
ABSTRACT:
A system and method measures parameters associated with an inductor such as in a switching converter. The inductance value can be determined by monitoring voltages and currents associated with the inductor when a measurement mode is activated. In one example, the measurement is provided by a signal processing system that includes an analog differentiator. In another example, the measurement is provided by a signal processing system that converts the analog measurement voltages into digital quantities that are analyzed in the digital domain. The value of the inductance value is determined by calculating of ΔVLand ΔIL/Δt. The saturation point in the inductance is located by measuring the change in slew rate of the inductance during the measurement mode. Average values for the inductor and the slew rate can be determined using digital techniques. Other parameters such as current limit and on-time of the inductor can be adjusted by this methodology.
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Hertzberg Brett A.
Hollington Jermele
Merchant & Gould
National Semiconductor Corporation
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