US 12,438,436 B2
Power converter
Da Jin, Shanghai (CN); Yahong Xiong, Shanghai (CN); and Qinghua Su, Shanghai (CN)
Assigned to Delta Electronics, Inc., Taoyuan (TW)
Filed by Delta Electronics, Inc., Taoyuan (TW)
Filed on Dec. 21, 2022, as Appl. No. 18/086,481.
Claims priority of application No. 202210160584.3 (CN), filed on Feb. 22, 2022.
Prior Publication US 2023/0268820 A1, Aug. 24, 2023
Int. Cl. H02M 3/07 (2006.01); H02M 1/00 (2006.01)
CPC H02M 1/0054 (2021.05) [H02M 3/07 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A power converter, comprising:
a positive input terminal, a ground terminal, a positive output terminal and a negative output terminal, wherein the negative output terminal is coupled to the ground terminal;
an input capacitor, wherein a first terminal and a second terminal of the input capacitor are electrically connected to the positive input terminal and the ground terminal respectively;
an input switch, wherein a first terminal of the input switch is electrically connected to the first terminal of the input capacitor;
a first bridge arm, electrically connected between a second terminal of the input switch and the ground terminal and comprising a first upper switch, a first middle switch and a first lower switch electrically connected in series, wherein the first upper switch and the first lower switch are electrically connected to the second terminal of the input switch and the ground terminal respectively, the first upper switch is connected to the first middle switch to form a first upper node, and the first middle switch is connected to the first lower switch to form a first lower node;
a second bridge arm, electrically connected to the first bridge arm in parallel and comprising a second upper switch, a second middle switch and a second lower switch electrically connected in series, wherein the second upper switch and the second lower switch are electrically connected to the second terminal of the input switch and the ground terminal respectively, the second upper switch is connected to the second middle switch to form a second upper node, and the second middle switch is connected to the second lower switch to form a second lower node;
a first storage capacitor, coupled between the first upper node and the second lower node;
a second storage capacitor, coupled between the second upper node and the first lower node;
a first output inductor, electrically connected between the first lower node and the positive output terminal;
a second output inductor, electrically connected between the second lower node and the positive output terminal; and
an output capacitor, coupled between the positive output terminal and the negative output terminal,
wherein the input switch is configured to block a rush current between the input capacitor and the first storage capacitor and/or the second storage capacitor,
wherein a control signal of the first upper switch and a control signal of the second upper switch have a same duty ratio and are out of phase with respect to each other by 180 degrees, a control signal of the first lower switch is complementary to the control signal of the second upper switch, and a control signal of the second lower switch is complementary to the control signal of the first upper switch,
wherein when the duty ratio is less than or equal to 50%, the first middle switch and the second upper switch are turned on and off synchronously, the second middle switch and the first upper switch are turned on and off synchronously, and the input switch is kept in an on state.