Patent ID: 9735566
Date: 2017-08-15
CPC Classifications: H02H

Claim:
1. An over-voltage protection loop for a transformer, the transformer to include a primary clock and feedback control circuit, a main servo loop circuit, and the over-voltage protection loop, the over-voltage protection loop comprising: an over-voltage winding magnetically coupled to a magnetic core, the over-voltage winding which, in response to a voltage on a primary winding in the primary clock and feedback control circuit, is activated to provide a secondary side voltage supply; an error amplifier electrically coupled to a first node and a second node, wherein the error amplifier uses the secondary side voltage supply to maintain a voltage on the second node according to an internal reference voltage; a feedback impedance electrically coupled between the first node and the second node, the feedback impedance which introduces a time delay to provide feedback from the first node to the second node; and an output voltage sensing circuit electrically coupled to at least the second node and a output node, the output voltage sensing circuit which controls an output voltage at the output node based on the voltage at the second node, wherein the over-voltage protection loop provides the output voltage for the transformer under an error condition.