US 11,888,342 B2
Bi-directional battery charging circuit with voltage regulation control
Yuncong Jiang, Santa Clara, CA (US); Christian Sporck, Campbell, CA (US); and Guanghui Li, Chengdu (CN)
Assigned to Monolithic Power Systems, Inc., San Jose, CA (US)
Filed by Monolithic Power Systems, Inc., San Jose, CA (US)
Filed on Dec. 29, 2020, as Appl. No. 17/136,980.
Claims priority of provisional application 63/023,852, filed on May 12, 2020.
Prior Publication US 2021/0359534 A1, Nov. 18, 2021
Int. Cl. H02J 7/00 (2006.01); G06F 1/30 (2006.01); H02J 9/06 (2006.01); H02M 3/158 (2006.01)
CPC H02J 7/00714 (2020.01) [G06F 1/30 (2013.01); H02J 7/0013 (2013.01); H02J 9/06 (2013.01); H02J 2207/20 (2020.01); H02M 3/1582 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electric system, having an input terminal to receive an input voltage, a system output terminal to provide a system voltage, and N charging output terminals coupled to N loads respectively, wherein N is an integer greater than 1, the electric system comprising:
an input switch coupled between the input terminal and a first terminal;
a switching circuit, coupled between the first terminal and the system output terminal, wherein the switching circuit is configured to work in a buck mode to convert a boost output voltage at the first terminal to the system voltage, or to work in a boost mode to convert the system voltage to the boost output voltage;
N charging units, wherein for each integer i from 1 to N, the ith charging unit of the N charging units has an input terminal coupled to the first terminal, and an output terminal coupled to the ith charging output terminal of the N charging output terminals for charging the ith load of the N loads; and
a voltage control module, having N input terminals coupled to the N charging units respectively, wherein the voltage control module is configured to sense N charging currents passing through the N charging units respectively, and to adjust the boost output voltage based on the N charging currents, wherein when the N charging currents are higher than or equal to a fast charge threshold current, the boost output voltage is controlled to decrease from an initial voltage.