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 |
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.
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