US 12,322,993 B2
Battery charger with a plurality of secondary transformer circuits
Martin Larsèn, Jönköping (SE)
Assigned to HUSQVARNA AB, Huskvarna (SE)
Appl. No. 17/291,448
Filed by Husqvarna AB, Huskvarna (SE)
PCT Filed Nov. 12, 2019, PCT No. PCT/SE2019/051139
§ 371(c)(1), (2) Date May 5, 2021,
PCT Pub. No. WO2020/111998, PCT Pub. Date Jun. 4, 2020.
Claims priority of application No. 1851468-7 (SE), filed on Nov. 27, 2018.
Prior Publication US 2022/0006316 A1, Jan. 6, 2022
Int. Cl. H02J 7/02 (2016.01); H02J 7/00 (2006.01)
CPC H02J 7/02 (2013.01) [H02J 7/00047 (2020.01); H02J 2207/20 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A battery charger, wherein the battery charger includes a charging circuit which comprises:
a primary transformer circuit connectable to a power source to receive charging current from the power source; and
a plurality of secondary transformer circuits, wherein at least one of the plurality of secondary circuits is arranged to cooperate with the primary transformer circuit to provide a charging voltage to at least one battery, and wherein the plurality of secondary transformer circuits are connected in series with each other; and wherein
a first secondary transformer circuit is configured to provide a first charging voltage to the at least one battery by means of a first set of terminals defining a first output, and
at least one second secondary transformer circuit is configured to provide an additive charging voltage, which is added to the first charging voltage from the first secondary transformer circuit to form a second charging voltage, wherein the second charging voltage is provided to the at least one battery by means of a second set of terminals defining a second output,
wherein the battery charger further comprises a charge control circuit connected to the charging circuit, and wherein the charge control circuit is arranged to identify which one of the first and second outputs the at least one battery is connected to, and
wherein the charge control circuit is arranged to identify the which one of the first and second outputs the at least one battery is connected to by communication with the at least one battery.