SYSTEM AND METHOD FOR MAINTAINING A CONSTANT OUTPUT VOLTAGE RIPPLE IN A BUCK CONVERTER IN DISCONTINUOUS CONDUCTION MODE

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United States of America Patent

SERIAL NO

15585028

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Abstract

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The system and method creates a substantially constant output voltage ripple in a buck converter in discontinuous conduction mode by varying the on-time of a pulse width modulator (PWM) signal driving the buck converter when the buck converter is operating in discontinuous conduction mode. A first signal is generated that is a function of the switching frequency of the buck converter. This signal is low-pass filtered and compared with a second signal that is a function of the switching frequency of the buck converter when operating in continuous conduction mode and with constant PWM on-time. The output signal generated by the comparator is a signal that is equal to the ratio of the first signal and the second signal. The on-time of a voltage controlled oscillator is controlled by the output signal, the oscillator signal causing the on-time of the PWM signal to vary in a controlled fashion.

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Patent Owner(s)

Patent OwnerAddress
INTERSIL AMERICAS LLC1001 MURPHY RANCH ROAD MILPITAS CA 95035

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
HOUSTON, Michael Jason Cary, US 18 210
LAUR, Steven Patrick Raleigh, US 7 19

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