System and method to limit maximum duty cycle and/or provide...

Details System and method to limit maximum duty cycle and/or provide... System and method to limit maximum duty cycle and/or provide...

2005-07-26

2005-07-26

Nguyen, Matthew V. (Department: 2838)

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

Reexamination Certificate

active

06922346

ABSTRACT:
A system and method are disclosed to limit a maximum duty cycle and/or provide a volt-second clamp for a pulse-width modulated (PWM) signal. Depending on the circuit topology, this approach can limit the absolute duty cycle or operate as a volt-second clamp in which the duty cycle is limited as a function of a variable input control voltage, such as a line voltage. The duty cycle can be selectively programmed by setting one or more external reference components, such as one or more respective resistors. Additionally, through component matching, desired clamping can be achieved with a high level of accuracy.

REFERENCES:
patent: 5021937 (1991-06-01), Cohen
patent: 5710697 (1998-01-01), Cooke et al.
patent: 6229366 (2001-05-01), Balakirshnan et al.
patent: 6246296 (2001-06-01), Smith
patent: 6356464 (2002-03-01), Balakrishnan et al.
Product brochure entitled, “Unitrode Average Current Mode PWM Controller”, Texas Instruments Incorporated, pp. 1-9, Copyright 1999.
Product brochure entitled, “Unitrode Current Mode PWM Controller”, Texas Instruments Incorporated, pp. 1-8, Copyright 1999.
Product catalog entitled, “Texas Instruments Sine On Power Supply Control”, Texas Instruments Incorporated, www.ti.com/sc/aajq1, Issue 1, pp. 1-12, 1Q 2002.

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