US 12,244,170 B2
Voltage conversion circuit, control method, DC/DC converter, and device
Tao Liang, Dongguan (CN); Weiping Liu, Dongguan (CN); Ren Liu, Dongguan (CN); and Dong Li, Shenzhen (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Guangdong (CN)
Filed on Jan. 30, 2023, as Appl. No. 18/161,252.
Application 18/161,252 is a continuation of application No. PCT/CN2021/108478, filed on Jul. 26, 2021.
Claims priority of application No. 202010761976.6 (CN), filed on Jul. 31, 2020.
Prior Publication US 2023/0179011 A1, Jun. 8, 2023
Int. Cl. H02J 7/34 (2006.01); H02J 7/00 (2006.01); H02M 1/32 (2007.01); H02M 1/36 (2007.01); B60L 3/04 (2006.01)
CPC H02J 7/345 (2013.01) [H02J 7/0013 (2013.01); H02M 1/32 (2013.01); H02M 1/36 (2013.01); B60L 3/04 (2013.01); B60L 2210/10 (2013.01); H02J 2207/20 (2020.01); H02J 2207/50 (2020.01)] 15 Claims
OG exemplary drawing
 
1. A voltage conversion circuit, comprising: a failure isolation module, a soft start module, and a voltage conversion module, wherein the voltage conversion module comprises an output filter capacitor;
both a first terminal of the failure isolation module and a first terminal of the soft start module are connected to a positive electrode of a first battery, both a second terminal of the failure isolation module and a second terminal of the soft start module are connected to a first terminal of the output filter capacitor, a second terminal of the output filter capacitor is connected to a negative electrode of the first battery, the voltage conversion module is connected to a high-voltage bus capacitor, and a rated voltage of the first battery is less than or equal to a first preset voltage;
the soft start module is configured to connect the first battery and the output filter capacitor, so that the first battery charges the output filter capacitor; and
the failure isolation module is configured to be turned on when the output filter capacitor is charged by the first battery and a voltage of the output filter capacitor is greater than or equal to a second preset voltage, so that the voltage conversion module converts a low-voltage direct current output by the first battery into a high-voltage direct current to charge the high-voltage bus capacitor, wherein the second preset voltage is less than the first preset voltage.