Method of detecting switching power supply output current

Details Method of detecting switching power supply output current Method of detecting switching power supply output current

2006-01-24

2006-01-24

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S284000, C323S351000

Reexamination Certificate

active

06989657

ABSTRACT:
A method and apparatus for detecting output current in switching power supplies forgoes the need for any resistor or other components in series with the load. A method according to the invention includes the steps of inferring the peak current through the inductor as a function of input voltage and inductor charge time, and deriving the current available to the load based upon the flyback voltage during discharge of the inductor. Although a disclosed example is based upon a buck/boost topology, other converter topologies are anticipated. In terms of apparatus, in a switching power supply of the type wherein a switching device is used to charge an inductor that discharges to a load, the invention provides devices arranged for detecting output current without the need for a resistor or other component in series with the load. In the preferred embodiment, these devices include electrical components operative to generate a signal indicative of peak inductor current, and a switch for switching the signal to provide a waveform, the integral of which is proportional to peak inductor current multiplied by the duty cycle of the discharge of the inductor. Circuitry is further used for comparing the waveform to a fixed reference so as to output a signal indicative of load current.

REFERENCES:
patent: 5367247 (1994-11-01), Blocher et al.
patent: 5696439 (1997-12-01), Presti et al.
patent: 6194882 (2001-02-01), Mirow et al.
patent: 6690144 (2004-02-01), DeNicholas et al.
patent: 6778416 (2004-08-01), Bruno

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