Phase angle detection module for power converter

A controller for a power converter, the controller comprising:

• 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 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;
• and
• a 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 drive signal is for controlling a switch coupled to regulate an output of the power converter.

A method of operating a controller of a power converter, the method comprising:

• asserting a leading edge signal when a leading edge of a voltage sense signal is detected, wherein the voltage sense signal is representative of an input voltage of the power converter;
• asserting a trailing edge signal when a trailing edge of the voltage sense signal is detected;
• generating a first state of a threshold signal 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;
• updating a conduction signal in response to the leading edge signal, the trailing edge signal, and the threshold signal, wherein the conduction signal is for controlling a switch coupled to regulate an output of the power converter.