US 11,996,719 B2
Modular storage unit with charger for power tool battery packs
Omid Shirazi, Wauwatosa, WI (US); Nathan J. Gustafson, Milwaukee, WI (US); and Matthew J. Peña, Wauwatosa, WI (US)
Assigned to Milwaukee Electric Tool Corporation, Brookfield, WI (US)
Filed by MILWAUKEE ELECTRIC TOOL CORPORATION, Brookfield, WI (US)
Filed on Mar. 26, 2021, as Appl. No. 17/214,479.
Claims priority of provisional application 63/000,688, filed on Mar. 27, 2020.
Prior Publication US 2021/0305824 A1, Sep. 30, 2021
Int. Cl. H02J 7/00 (2006.01); H01M 50/204 (2021.01); H01M 50/244 (2021.01); H01M 50/247 (2021.01); H02M 1/42 (2007.01); H02M 3/335 (2006.01)
CPC H02J 7/0044 (2013.01) [H01M 50/204 (2021.01); H01M 50/244 (2021.01); H01M 50/247 (2021.01); H02J 7/0045 (2013.01); H02M 1/425 (2013.01); H02M 3/33507 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A charger for power tool battery packs comprising:
a battery pack interface configured to receive a power tool battery pack;
an AC power input for receiving input AC power;
a converter for converting AC power at the AC power input to high-voltage DC output; and
a DC-DC converter connected between the converter and the battery pack interface, the DC-DC converter including an active clamp flyback topology and configured to convert the high-voltage DC output to a charging DC power provided to the battery pack interface,
wherein the DC-DC converter further includes:
an active clamp flyback converter receiving the high-voltage DC output;
an active clamp flyback controller configured to control the active clamp flyback converter to convert the high-voltage DC output to a corresponding voltage;
a charge FET electrically connected between the AC flyback converter and the battery pack interface; and
a charge FET control circuit configured to enable and disable the charge FET to charge the power tool battery pack using the corresponding voltage.