POWER CONVERTER CONTROLLER WITH STABILITY COMPENSATION

摘要

A switch mode power converter includes a primary side, an energy transfer element, and a secondary side. The secondary side includes output terminals coupled to a load and an output capacitance across the output terminals. The secondary side further includes a compensation signal generator—configured to generate a compensation signal. The compensation signal compensates charging the output capacitance with power transferred from the primary side to the secondary side. The secondary side further includes computational circuitry configured to output an adjusted compensation signal that compensates, based on the compensation signal, one of an output sense signal representative of an output signal at the output terminals and a reference signal representative of a desired output voltage of the switch mode power converter. The secondary side further includes a comparator to compare the adjusted compensation signal with the other one of the output sense signal and the reference signal.

主权项

1. Controller circuitry for a switch mode power converter having an output capacitance to smooth an output voltage of the switch mode power converter, the controller circuitry comprising:
an output sense input coupled to receive an output sense signal representative of the output voltage of the switch mode power converter; a switching sense signal input coupled to receive a switching sense signal indicative of switching of a switch of the switch mode power converter; compensation circuitry coupled to receive the switching sense signal and configured to, based on the switching sense signal, output a compensated reference signal, wherein during at least a part of a time that the output capacitance is being charged, the compensated reference signal is representative of a lower output than a desired output voltage of the switch mode power converter; and a comparator configured to compare the compensated reference signal with the output sense signal representative of the output voltage of the switch mode power converter, wherein the comparator is configured to output a comparison result signal indicative of a result of the comparison of the compensated reference signal with the output sense signal.