Patent ID: 9337811
Filing Date: 2016-05-10
CPC Classification: G05B,H02M,H03K

Claim Text:
1. A method for hysteretic control of a pulse width modulation (PWM) generator, said method comprising the steps of: monitoring an output of a PWM generator; determining when the output of the PWM generator changes from a low to a high level; starting a blanking timer when the output of the PWM generator changes from the low to the high level; selecting a high limit value from a high limit register as an input to a digital-to-analog converter (DAC); determining when the blanking timer has timed out; enabling an output of a comparator when the blanking timer has timed out for indicating a comparison of an output of the DAC representing the high limit value with a process feedback signal; determining when the process feedback signal is greater than the DAC output; signaling the PWM generator to change its output to the low level when the process feedback signal is greater than the DAC output; determining when the output of the PWM generator changes from the high to the low level; starting the blanking timer when the output of the PWM generator changes from the high to the low level; reversing the output of the comparator; selecting a low limit value from a low limit register as the input to the DAC; determining when the blanking timer has timed out; enabling the output of the comparator when the blanking timer has timed out for indicating a comparison of the output of the DAC representing the low limit value with the process feedback signal; determining when the process feedback signal is less than the DAC output; signaling the PWM generator to change its output to the high level when the process feedback signal is less than the DAC output; and returning to the step of monitoring the output of the PWM generator.