Patent ID: 9698681
Date: 2017-07-04
CPC Classifications: H02M

Claim:
1. An adaptive duty cycle limiting circuit for use with a switching DC-to-DC converter comprising: a ramp generator configured for receiving an output voltage of the switching DC-to-DC converter communicated from an output terminal of the switching DC-to-DC converter and configured for generating an output ramp signal created from the output voltage of the switching DC-to-DC converter; a variable voltage source configured for receiving an adjusting voltage level indicating the voltage level of an input voltage source and configured for generating an output voltage level that is a fractional value of the voltage level of the input voltage source; and a comparator circuit configured for receiving the output voltage level of the variable voltage source, and the output voltage ramp signal, and configured for determining if the voltage level of the variable voltage source is less than or greater than output voltage ramp signal to generate a duty cycle limit signal for transfer to a converter switching control circuit to adjust the duty cycle of the switching DC-to-DC converter.