System and method for determining load current in switching...

Details System and method for determining load current in switching... System and method for determining load current in switching...

2007-01-09

2007-01-09

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

C323S284000, C323S285000, C323S286000, C323S222000

Reexamination Certificate

active

11006746

ABSTRACT:
Novel circuitry and methodology for determining a load current in a switching regulator circuit operable in a pulse skipping mode of operation and having main and synchronous switches. The load current is determined based on a ratio of time when the synchronous switch is on in the pulse skipping mode to an average period of a switching cycle in the pulse skipping mode. The load current may be measured by a circuit that determines an average value of a switch control signal for controlling the synchronous switch. The load current determining circuit may comprise a low-pass filter for filtering the switch control signal proportional to an input voltage supplied to the switching regulator circuit.

REFERENCES:
patent: 4694239 (1987-09-01), Marchio′ et al.
patent: 5552694 (1996-09-01), Appeltans
patent: 6366070 (2002-04-01), Cooke et al.
patent: 6396252 (2002-05-01), Culpepper et al.

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