Patent ID: 8525502
Filing Date: 2013-09-03
Classification: H02M,Y02B

Abstract:
1. A digital pulse controller comprising: digital logic to send pulses to the high side and low side switches of a switch-mode power supply converter, the digital logic allowing for a pulse frequency mode which includes a frequency targeting mode and an ultrasonic mode, the ultrasonic mode being switched into when the frequency of the pulses is at or below a frequency threshold and a total on-time of the pulses reaches a minimum threshold; wherein during the frequency targeting mode if the frequency is within an acceptable range, the frequency is adjusted without changing the total on-time of the pulse, and wherein if the frequency is at or below the frequency threshold, but the total on-time is above the minimum threshold the total on time of the pulses is reduced; and wherein during the ultrasonic mode the total on-time of the pulses is kept fixed at the minimum threshold and the ratio of the high-side pulse on-time to low-side pulse on-time is adjusted to control an output voltage.