Dynamic duty cycle clamping for switching converters

Details Dynamic duty cycle clamping for switching converters Dynamic duty cycle clamping for switching converters

2005-05-17

2005-05-17

Patel, Rajnikant B. (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S080000, C323S268000

Reexamination Certificate

active

06894910

ABSTRACT:
A method and system for dynamic limiting of the pulse width or duty cycle of a switched DC-to-DC power supply. The system includes a first comparator coupled to the voltage to be regulated and to a reference voltage for generating an error signal. The error signal controls the duty cycle or pulse width of a PWM. A limiter circuit includes a further comparator which compares the error signal to a second reference voltage to generate a further limiting feedback signal for application to the first comparator. When the error signal tends to rise above a value established by the second reference voltage, the limiter applies a signal to the first comparator tending to reduce the error signal to thereby prevent the error signal from rising sufficiently to produce the undesired operating condition.

REFERENCES:
patent: 4218647 (1980-08-01), Haas
patent: 6326771 (2001-12-01), Popescu-Stanesti

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