Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2000-11-14
2001-08-14
Riley, Shawn (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S283000
Reexamination Certificate
active
06275019
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to switching power supplies, and more particularly, to a circuit for controlling non-overlap times in the controller of such power supplies.
BACKGROUND OF THE INVENTION
Switching power supplies use a driver controller that turns the power switches ON and OFF. It is important that the controller not allow both power switches to be ON at the same time. So, the controller operates to turn OFF one switch before it turns ON the other, a so-called non-overlap condition. For efficient operation of the power supply, the optimum non-overlap duration that both switches are OFF depends on the specific circuit arrangement and the specific components used.
Some controllers use a constant duration non-overlap time that is sufficient for most applications. But this approach means that there will be specific circuit arrangements for which the non-overlap time duration will not be near optimal. Other controllers attempt to control the non-overlap time duration according to the specific circuit arrangement, but such approaches tend to rely on relatively complex sensing and control circuits such as complex phase-locked loops.
REFERENCES:
patent: 5260861 (1993-11-01), Wert
patent: 5272615 (1993-12-01), Wert
patent: 5777461 (1998-07-01), Massie et al.
patent: 5781058 (1998-07-01), Sanzo et al.
patent: 5896058 (1999-04-01), Sanzo et al.
patent: 6057675 (2000-05-01), Tateishi
Atkins Robert D.
Riley Shawn
Semiconductor Components Industries LLC
Wallace Michael T.
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