US 12,139,039 B2
Charging EV battery using parallel buck and boost converters
Aaron Rogers, Newark, CA (US); Nathan Biesterfeld, Newark, CA (US); and Nikola Milivojevic, Newark, CA (US)
Assigned to SPEED CHARGE, LLC, Carter Lake, IA (US)
Filed by SPEED CHARGE, LLC, Carter Lake, IA (US)
Filed on May 9, 2023, as Appl. No. 18/195,352.
Application 18/195,352 is a continuation of application No. 17/821,368, filed on Aug. 22, 2022, granted, now 11,642,981.
Claims priority of provisional application 63/391,703, filed on Jul. 22, 2022.
Prior Publication US 2024/0025296 A1, Jan. 25, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H02J 7/00 (2006.01); B60L 50/60 (2019.01); B60L 53/10 (2019.01); B60L 53/53 (2019.01); B60L 58/18 (2019.01); H02J 7/34 (2006.01); H02M 1/00 (2006.01); H02M 3/158 (2006.01)
CPC B60L 58/18 (2019.02) [B60L 50/60 (2019.02); B60L 53/11 (2019.02); B60L 53/53 (2019.02); H02J 7/00714 (2020.01); H02J 7/342 (2020.01); H02M 1/0009 (2021.05); H02M 3/1582 (2013.01); B60L 2210/10 (2013.01); B60L 2210/12 (2013.01); B60L 2210/14 (2013.01); H02J 2207/20 (2020.01)] 18 Claims
OG exemplary drawing
 
1. A method for controlling a charging current while transferring energy from a source battery to a target battery in an electric vehicle (EV), the method comprising:
operating, by control circuitry, a buck converter at a fixed switching frequency to transfer power from the source battery to the target battery, in a first operational mode, wherein a pulse width modulation (PWM) duty cycle increases during the first operation mode;
in response to detecting a first trigger event, transitioning from the first operational mode to a second operational mode to operate the buck converter at a variable switching frequency to increase a resolution of the PWM duty cycle relative to the first operational mode; and
in response to detecting a second trigger event, transitioning to a third operational mode to activate a boost converter coupled to the source battery and the target battery.