Patent ID: 9059641
Filing Date: 2015-06-16
Classification: G01R,H02M,Y02B,Y02P

Abstract:
1. A power-factor-correction (PFC) converter circuit, comprising: a rectifier circuit; an energy storage device coupled to the rectifier circuit and configured to receive an input voltage from the rectifier circuit; a switch coupled to the energy storage device, the switch configurable to provide a path for removing energy from the energy storage device; a microcontroller coupled to the energy storage device and the switch; and an analog-to-digital converter (ADC) coupled to an output of the power-factor-correction (PFC) converter circuit and to the microcontroller, where the microcontroller includes a pulse width modulation (PWM) module coupled to the energy storage device, the PWM module being configured to enable the ADC to sample an output voltage of the power-factor-correction (PFC) converter circuit by detecting a zero voltage crossing point of the input voltage received from the rectifier circuit based on an absence of a trigger event that occurs external to the microcontroller, the absence of the trigger event being based on an end of decrease current flow in the energy storage device.