US 11,722,067 B2
Flyback converter with secondary side regulation
Satish Kumar Vemuri, Raleigh, NC (US); James M. Walden, Apex, NC (US); and Isaac Cohen, Dix Hills, NY (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by Texas Instruments Incorporated, Dallas, TX (US)
Filed on May 23, 2018, as Appl. No. 15/987,493.
Application 15/987,493 is a continuation of application No. 15/202,629, filed on Jul. 6, 2016, granted, now 10,008,947.
Claims priority of provisional application 62/199,791, filed on Jul. 31, 2015.
Prior Publication US 2018/0269797 A1, Sep. 20, 2018
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/33592 (2013.01) [H02M 3/33523 (2013.01); H02M 1/0009 (2021.05); Y02B 70/10 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A control circuit for controlling a switch coupled to a secondary winding of a transformer, the control circuit comprising:
a logic circuit having first and second logic inputs, a setpoint voltage reference input, a threshold voltage reference input, and a logic output, the first logic input adapted to be coupled to a first terminal of the secondary winding, the second logic input adapted to be coupled to a second terminal of the secondary winding, the logic output adapted to be coupled to a control terminal of the switch, and the logic circuit configured to:
close the switch a first time during a first power transfer cycle by providing a first control at the logic output responsive to the first logic input;
open the switch during the first power transfer cycle in response to detecting a current of the secondary winding returning to zero; and
close the switch a second time responsive to a positive voltage spike at the second logic input during the first power transfer cycle.