Texas Instruments Incorporated
Transient control for power factor correction

Abstract:

A drive circuit includes a transient detector that includes a detector input to receive a loop error signal from a phased locked loop (PLL) and generates a transient detected output signal if a transient is detected in an alternating current (AC) input voltage. A controller includes a controller input to receive the transient detected output signal from the transient detector and a feedback input to sense the AC input voltage provided to a bridge circuit. The controller is configured to apply a PLL angle output signal from the PLL to control switch output signals to the bridge circuit if the transient detected output signal is not generated and configured to apply the AC input voltage sensed from the feedback input to control the switch output signals to the bridge circuit if the transient detected output signal is generated.