Multiple switch node power converter control scheme that...

Details Multiple switch node power converter control scheme that... Multiple switch node power converter control scheme that...

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

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