Method and apparatus for a pulse width modulated DC-DC...

Details Method and apparatus for a pulse width modulated DC-DC... Method and apparatus for a pulse width modulated DC-DC...

2008-06-17

2008-06-17

Sterrett, Jeffrey L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S283000, C363S097000

Reexamination Certificate

active

07388358

ABSTRACT:
A pulse width modulated pulse signal is generated and its duty cycle adjusted according to at least two different schedules, for example, a coarse tuning cycle and a fine tuning cycle. The target duty cycle is derived according to an offset between output voltage and target voltage, as well as the rate of changes in the offset. In the coarse tuning cycle, large changes in the control signal pulse width is used to drive output voltage to target at a fast pace. As output voltage approaches target voltage, smaller adjustment are made to the duty cycle of the control pulse width in the fine tuning cycle. The rate of pulse width change is also taken into consideration, to further improve operation of the DC-DC converter.

REFERENCES:
patent: 5272614 (1993-12-01), Brunk et al.
patent: 5506484 (1996-04-01), Munro et al.
patent: 6025706 (2000-02-01), Takimoto et al.
patent: 7239116 (2007-07-01), Tang
patent: 2006/0022656 (2006-02-01), Leung et al.
patent: 2006/0132110 (2006-06-01), Tang
patent: 2007/0018627 (2007-01-01), Chen

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