Patent Number: 8,716,999

Title: Dynamic frequency and pulse-width modulation of dual-mode switching power controllers in photovoltaic arrays

Abstract: A converter unit configured to couple to a photovoltaic panel may include a controller that monitors: an output voltage and output current obtained from the photovoltaic panel by a switching power core within the converter unit, and an output voltage and output current produced by the switching power core. The controller may calculate a desired duty-cycle value based on the monitored values, and implement a mapping algorithm that translates the duty-cycle value to a pulse-width value and a modulus value. The pulse-width value and the modulus value may be used to simultaneously respectively modulate the pulse-width and pulse-period of a pulse-width modulated (PWM) signal, while maintaining an appropriate linear final duty-cycle ratio between the pulse-width and the pulse-period of the PWM signal. The PWM signal may be provided to the switching power core to control the switching of the switching power core.

Inventors: Williams; Bertrand J. (Austin, TX)

Assignee: Draker, Inc.

International Classification: H02M 3/157 (20060101); H02M 1/36 (20070101)

Expiration Date: 5/06/12018