Low total harmonic distortion and high power factor correction power converters

摘要

A controller circuit for the control of a power converter is disclosed. An example controller circuit generates a waveform that drives a switch that controls the power converter. The controller circuit includes a divider module that generates a modification factor based on a ratio of the two input signals of the module. The circuit includes a module that generates a first waveform configured for a critical conducting mode of operation of a power converter and an on-time adjuster module that modifies the first waveform based on the modification factor and generates a second waveform. The second waveform is delivered to the switch. An example modification factor is the ratio of the output voltage to the rectified input voltage of the power converter.

主权项

1. A controller circuit comprising:
a divider module configured to receive a first signal and a second signal and to generate a modification factor proportional to a ratio of the first signal and the second signal; a critical conducting mode module including a pulse width modulation (PWM) circuit configured to generate a first waveform when the circuit is operating in a critical conducting mode; and an on-time adjuster module coupled to the divider module and the critical conducting mode module and configured to receive the modification factor and the first waveform and generate a second waveform based on the first waveform and the modification factor.