Phase angle detection module for power converter

摘要

A power converter controller asserts a leading edge signal when a leading edge of a voltage signal is detected. The voltage sense signal is representative of an input voltage of the power converter. A trailing edge signal is asserted when a trailing edge of the voltage signal is detected. A first state of a threshold signal is generated when the voltage sense signal is at or above an upper threshold and generating a second state of the threshold signal when the voltage sense signal is at or below a lower threshold. A conduction signal is updated in response to the leading edge signal, the trailing edge signal, and the threshold signal. The conduction signal is for controlling a switch coupled to regulate an output of the power converter.

主权项

1. A switched mode power converter comprising:
a switch; an energy transfer element coupled to the switch; and a controller coupled to the switch to regulate an output of the switched mode power converter, wherein the controller includes:
a phase angle detector coupled to output a conduction signal in response to a voltage sense signal, wherein the voltage sense signal is representative of an input voltage of the switched mode power converter, the phase angle detector comprising:a leading edge detection module coupled to assert a leading edge signal in response to detecting a leading edge in the voltage sense signal;a trailing edge detection module coupled to assert a trailing edge signal in response to detecting a trailing edge in in the voltage sense signal;a threshold module coupled to generate a first state of a threshold signal when the voltage sense signal is at or above an upper threshold and coupled to generate a second state of the threshold signal when the voltage sense signal is at or below a lower threshold; anda phase angle converter module coupled to receive the leading edge signal, the trailing edge signal, and the threshold signal, and further coupled to output the conduction signal; and a drive circuit coupled to output a drive signal in response to the conduction signal, wherein the switch is coupled to regulate an output of the switched mode power converter in response to the conduction signal.