US 11,946,979 B2
Short circuit and soft short protection for data interface charging
Jianming Yao, Campbell, CA (US); Kai-wen Chin, Campbell, CA (US); Yong Li, Campbell, CA (US); Cong Zheng, Campbell, CA (US); David Nguyen, Campbell, CA (US); and Fuqiang Shi, Campbell, CA (US)
Assigned to Dialog Semiconductor Inc., Campbell, CA (US)
Filed by DIALOG SEMICONDUCTOR INC., Campbell, CA (US)
Filed on Jun. 8, 2021, as Appl. No. 17/342,495.
Application 17/342,495 is a continuation of application No. 15/604,515, filed on May 24, 2017, granted, now 11,031,796.
Claims priority of provisional application 62/341,606, filed on May 25, 2016.
Prior Publication US 2021/0293897 A1, Sep. 23, 2021
Int. Cl. G01R 31/50 (2020.01); G01R 31/52 (2020.01); H02J 7/00 (2006.01); H02M 1/32 (2007.01); H02M 3/335 (2006.01)
CPC G01R 31/52 (2020.01) [G01R 31/50 (2020.01); H02J 7/0071 (2020.01); H02M 1/32 (2013.01); H02M 3/33523 (2013.01); H02J 7/00 (2013.01); H02J 7/00034 (2020.01)] 6 Claims
OG exemplary drawing
 
1. A method of short or soft-short circuit condition detection, comprising:
while a load device draws no current and is connected to a switching power converter through a data interface cable, ceasing a cycling of a primary-side power switch in the switching power converter during a set period of time;
determining whether an output voltage to the data interface cable has dropped below a droop threshold rate during the set period of time while the primary-side power switch has ceased cycling; and
detecting a presence of a soft-short circuit in the data interface cable responsive to a determination that the output voltage dropped below the droop threshold rate during the set period of time.