Controller for detecting an output current of a power converter, device for detecting an average output current of a power converter, method for detecting an average output current of a power converter, and method for detecting an output current of a power converter

A device for detecting an average output current of a power converter, the device comprising:

• a current generation unit for generating a first charge current according to an intermediate voltage, wherein the intermediate voltage corresponds to the average output current of a secondary side of the power converter;
• a first voltage generation unit coupled to the current generation unit for generating a first node voltage according to the first charge current, a first discharge current, a discharge time, and an inverse discharge time;
• a first current mirror unit coupled to the first voltage generation unit for generating a first current according to the first node voltage, and generating a second voltage according to the first current, wherein the second voltage corresponds to the average output current of the secondary side of the power converter;
• and
• a second current mirror unit coupled to the first current mirror unit for generating the first discharge current according to the first current.

A method for detecting an average output current of a power converter, the method comprising:

• generating a first charge current according to an intermediate voltage, wherein the intermediate voltage corresponds to the average output current of a secondary side of the power converter;
• generating a first node voltage according to the first charge current, a first discharge current, a discharge time, and an inverse discharge time;
• generating a first current according to the first node voltage;
• generating the first discharge current according to the first current;
• and
• generating a second voltage according to the first current, wherein the second voltage corresponds to the average output current of the secondary side of the power converter.

A method for detecting an output current of a power converter, the method comprising:

• setting an intermediate voltage to be between a maximum value and a minimum value of a detection voltage during a turning-on time of a power switch of a primary side of the power converter when the power converter is powered on;
• generating a first variable turning-on time according to the detection voltage, the intermediate voltage, and the turning-on time, wherein a second variable turning-on time is equal to the turning-on time minus the first variable turning-on time;
• and
• adjusting the intermediate voltage according to the first variable turning-on time, the second variable turning-on time, the turning-on time, a charge current, and a discharge current, wherein the output current corresponds to the intermediate voltage.