Isolated power converter

An apparatus comprising:

• a feedback voltage processor having first and second inputs and a feedback output, the first input coupled to a power converter output terminal, the second input coupled to a target voltage terminal, and the feedback voltage processor configured to generate a feedback indicator at the feedback output responsive to a first voltage at the power converter output terminal and a target voltage at the target voltage terminal;
• a control message generator having a control input and a control message output, the control input coupled to the power converter output terminal, and the control message generator configured to provide a control message at the control message output responsive to whether the first voltage is within a target voltage range;
• and
• a status signal generator having a first signal input, a second signal input, and a status signal output, the first signal input coupled to the feedback output, the second signal input coupled to the control message output, and the status signal generator configured to:
• receive the feedback indicator at the first signal input;
• receive the control message at the second signal input;
• and
• provide a status signal at the status signal output, the status signal including the feedback indicator and the control message.

A method comprising:

• receiving a status signal via a communication channel between primary side and secondary side circuits of a power converter, in which the status signal includes a feedback indicator and a control message, in which the feedback indicator represents a relationship between a target voltage and an output voltage of the secondary side circuit, and the control message indicates whether the output voltage is within a target voltage range;
• determining a state of the feedback indicator;
• responsive to the state of the feedback indicator, set an on-time period and an off-time period of a power stage of the primary side circuit;
• and
• responsive to the control message, set a state of an output voltage status terminal indicating whether the output voltage is within the target voltage range.

A method comprising:

• receiving a first voltage from an output of a power converter;
• generating a feedback indicator representing a relationship between the first voltage and a target voltage;
• generating a control message indicating whether the first voltage is within a target voltage range;
• generating a status signal including the feedback indicator and the control message;
• and
• transmitting the status signal via a communication channel between primary and secondary side circuits of the power converter.

An apparatus, comprising:

• a primary side circuit including:
• a power stage having a power stage voltage input, a power stage control input, and a power stage output;
• a controller having a power stage control output, an output voltage status terminal, and a status signal input, the power stage control output coupled to the power stage control input;
• a transformer having a primary side coil and a secondary side coil, the primary side coil coupled to the power stage output;
• a secondary side circuit having a secondary side input and an output voltage terminal, the secondary side input coupled to the secondary side coil, the secondary side circuit including:
• a feedback voltage processor having a feedback input and a feedback output, the feedback input coupled to the output voltage terminal;
• a control message generator having a control input and a control message output, the control input coupled to the output voltage terminal;
• and
• a status signal generator having first and second signal inputs and a status signal output, the first signal input coupled to the feedback output, and the second signal input coupled to the control message output;
• and
• a communication channel device having a channel input and a channel output, the channel input coupled to the status signal output, and the channel output coupled to the status signal input.