Patent ID: 11881787
Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A method of operating a power converter, the method comprising:
making, by a controller, a push transistor on a primary side of the power converter conductive in response to a start of a push phase of the power converter;
making, by the controller, a pull transistor on the primary side of the power converter conductive in response to a start of a pull phase of the power converter;
making, by the controller, a push-high rectifier on a secondary side of the power converter conductive during each in response to the start of the push phase, wherein the push-high rectifier is coupled between a phase node and a first terminal of a secondary winding of a transformer;
making, by the controller, a push-low rectifier on the secondary side of the power converter conductive in response to the start of the push phase, wherein the push-low rectifier is coupled between a second terminal of the secondary winding and a ground node;
making, by the controller, a pull-high rectifier on the secondary side of the power converter conductive in response to the start of the pull phase, wherein pull pull-high rectifier is coupled between the phase node and the second terminal of the secondary winding;
limiting, by a clamp circuit coupled to the phase node, a push-phase voltage excursion of the phase node during the push phase by:
conducting a current from the phase node through a diode to a clamp capacitor in response to determining that a voltage on the phase node exceeds an excursion voltage; and then
coupling the phase node to the clamp capacitor in response to determining a first predetermined time has elapsed since the start of the push phase.