US 12,224,613 B2
Charging system and charging method of universal serial bus
Li-Hsin Huang, Shenzhen (CN)
Assigned to ARK MICROELECTRONIC CORP. LTD., Guangdong (CN)
Filed by Ark Semiconductor Corp. Ltd., Shenzhen (CN)
Filed on Nov. 1, 2021, as Appl. No. 17/516,644.
Claims priority of application No. 202011518778.3 (CN), filed on Dec. 21, 2020.
Prior Publication US 2022/0200294 A1, Jun. 23, 2022
Int. Cl. H02J 7/00 (2006.01); G06F 1/26 (2006.01); G06F 13/42 (2006.01)
CPC H02J 7/007 (2013.01) [G06F 1/26 (2013.01); G06F 13/4282 (2013.01); G06F 2213/0042 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A charging system comprising:
a primary power source;
a power source controller coupled to the primary power source, comprising:
an auxiliary power source;
a first auxiliary power terminal coupled to the auxiliary power source, and configured to provide a first detection current; and
a load detection circuit;
a first switch comprising:
a first terminal coupled to the primary power source;
a second terminal; and
a control terminal coupled to the power source controller;
a third switch comprising:
a first terminal coupled to the first auxiliary power terminal;
a second terminal; and
a control terminal coupled to the power source controller; and
a first port coupled to the second terminal of the first switch and the second terminal of the third switch;
wherein:
the power source controller stores a preset no-load threshold current, representing a state in which the first port being disconnected or a first wire connected to the first port is floating;
the power source controller initially sets the first switch to be off, the third switch to be on, and the first auxiliary power terminal to provide the first detection current to the first port through the third switch; and
when the first detection current is less than the preset no-load threshold value, the power source controller determines that no load is coupled to the first port and maintains the first switch to be off, the third switch to be on, and the first auxiliary power terminal to provide the first detection current through the third switch.