US 11,056,968 B2
Power converter, power controller, and control method capable of providing multiple protections
Chun-Teh Chen, Hsinchu (TW); Yi Lun Shen, Hsinchu (TW); Yu-Yun Huang, Hsinchu (TW); and Ren Yi Chen, Hsinchu (TW)
Assigned to WELTREND SEMICONDUCTOR INC., Hsinchu (TW)
Filed by Weltrend Semiconductor Inc., Hsinchu (TW)
Filed on Sep. 27, 2018, as Appl. No. 16/144,411.
Claims priority of application No. 106134107 (TW), filed on Oct. 3, 2017.
Prior Publication US 2019/0103807 A1, Apr. 4, 2019
Int. Cl. H02M 1/36 (2007.01); H02M 1/32 (2007.01); H02M 3/335 (2006.01); H02H 7/12 (2006.01)
CPC H02M 1/32 (2013.01) [H02H 7/1213 (2013.01); H02M 3/33507 (2013.01); H02M 3/33523 (2013.01); H02M 2001/327 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A power converter for converting an input voltage into an output voltage, the power converter comprising:
a transformer with a primary winding, a secondary winding and an auxiliary winding;
a power switch connected in series with the primary winding between the input voltage and an input ground;
a power controller controlling the power switch to control a winding current through the primary winding, wherein the power controller has a multi-function pin; and
a multi-purpose circuit, comprising:
first and second resistors, wherein a connection node makes the first and second resistors connected in series between two ends of the auxiliary winding; and
a rectifier and a thermistor, connected in parallel between the multi-function pin and the connection node;
wherein the power controller is capable of performing over-voltage protection and over-temperature protection via the multi-purpose circuit and the multi-function pin.