Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2011-03-08
2011-03-08
Han, Jessica (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S259000, C323S271000
Reexamination Certificate
active
07902807
ABSTRACT:
A method of and system for modulating buck and boost modulation ramps of a multiple switch node power converter without overlap. As the pulse width or duty cycle of the signal to a modulated complementary switching pair approaches a pre-established reference pulse width or duty cycle, plural fixed-width or fixed duty cycle pulses are generated and introduced to a nonmodulated complementary switching pair. A controller detects proximity to the pulse width or duty cycle limit and, correspondingly, initiates prematurely a pseudo-buck-boost mode in the power converter by generating fixed-width or fixed duty cycle pulses to the nonmodulated complementary switching pair while the duty cycles or pulse widths to the modulated complementary switching pair are still controlled by the appropriate modulation ramp. The net effect is that the power converter reaches its optimal operating point without overlap and eliminates any sub-harmonic switching.
REFERENCES:
patent: 6384652 (2002-05-01), Shu
patent: 7479769 (2009-01-01), Xu
patent: 7652453 (2010-01-01), Iulian
patent: 7656142 (2010-02-01), Liao
Keskar Neeraj Arun
Miller Peter James
Brady III Wade J.
Han Jessica
Kempler William B.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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