Digital voltage converter with constant off-time and...

Details Digital voltage converter with constant off-time and... Digital voltage converter with constant off-time and...

2007-07-13

2010-02-02

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

C323S222000, C323S283000

Reexamination Certificate

active

07656136

ABSTRACT:
In a digital boost or buck-boost converter, a pulse width modulation signal has an on-time and an off-time. A constant off-time period is provided to set the off-time to be constant, and an on-time period to determine the on-time is derived by monitoring the output voltage of the converter. With the constant off-time, the output voltage and the on-time period will have a linear relation, thereby reducing the output ripple when the converter operates with a high duty-ratio.

REFERENCES:
patent: 5801935 (1998-09-01), Sugden et al.
patent: 6178104 (2001-01-01), Choi
patent: 6448745 (2002-09-01), Killat
patent: 6992468 (2006-01-01), Kranz
patent: 7141956 (2006-11-01), Chapuis
patent: 7202651 (2007-04-01), Chapuis
patent: 7315157 (2008-01-01), Chapuis
patent: 7323851 (2008-01-01), Markowski
patent: 7394236 (2008-07-01), Chapuis et al.

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