Patent ID: 9203305
Filing Date: 2015-12-01
Classification: G05B,H02M

Abstract:
1. A pulse width modulation power converter, comprising: an output stage generating an output voltage according to a pulse width modulation signal and an input voltage by a switching element, a source of an output voltage reference, an analog digital converter connected to the output stage and to the source of the output voltage reference, sampling and amplifying a difference between the output voltage and the output voltage reference to generate an error signal, a PID controller connected to the analog digital converter and to the switching element wherein the PID controller is configured by a set of PID coefficients, for determining a duty ratio, a pulse width modulator that generates the pulse width modulation signal according to the duty ratio, a detector for detecting a steady state and a load transient, wherein the pulse width modulation converter further comprises: a memory for storing a first set of PID coefficients and a second set of PID coefficients, a mode selector for selecting one of the first set of PID coefficients or the second set of PID coefficients for configuring the PID controller, the first set of PID coefficients being selected in case the steady state is detected, and the second set of PID coefficients being selected in case the load transient is detected, wherein the detector for detecting the steady state and the load transient monitors the error signal and compares each value of the error signal to its predecessor by generating an error signal difference; and wherein a duty ratio difference of the duty ratio and its predecessor is computed, and, in case during an off-time of the pulse width modulation signal, the duty ratio difference exceeds a threshold, the pulse width modulator is triggered to start a new pulse width modulation period.