US 12,407,245 B2
Power converter improving input overvoltage from output voltage drop
Chun-Kai Hsu, Hsinchu (TW); and Chih-Heng Su, Hsinchu (TW)
Assigned to ANPEC ELECTRONICS CORPORATION, Hsinchu (TW)
Filed by ANPEC ELECTRONICS CORPORATION, Hsinchu (TW)
Filed on Nov. 13, 2023, as Appl. No. 18/508,185.
Claims priority of application No. 112133963 (TW), filed on Sep. 7, 2023.
Prior Publication US 2025/0088091 A1, Mar. 13, 2025
Int. Cl. H02M 1/00 (2007.01); H02M 1/14 (2006.01); H02M 3/158 (2006.01)
CPC H02M 1/143 (2013.01) [H02M 1/0003 (2021.05); H02M 3/158 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A power converter improving input overvoltage from output voltage drop, comprising:
a high-side switch, wherein a first terminal of the high-side switch is connected to an input voltage source and receives an input voltage from the input voltage source;
a low-side switch, wherein a first terminal of the low-side switch is connected to a second terminal of the high-side switch, a second terminal of the low-side switch is grounded, a node between the first terminal of the low-side switch and the second terminal of the high-side switch is connected to a first terminal of an inductor, a second terminal of the inductor is connected to first terminals of one or more output capacitors, second terminals of the one or more output capacitors are grounded, and a node between the second terminal of the inductor and the first terminals of the one or more output capacitors is used as an output terminal of the power converter;
a control circuit connected to a control terminal of the high-side switch and a control terminal of the low-side switch, and configured to control operations of the high-side switch and the low-side switch; and
a voltage threshold determining circuit configured to determine whether an output voltage of an output voltage signal at the output terminal of the power converter is dropping according to an output voltage dropping signal from an external dropping indicating circuit connected thereto to determine or adjust a voltage threshold, and configured to output a voltage threshold indicating signal indicating the voltage threshold; and
a voltage drop suppression circuit connected to the first terminal of the high-side switch and the voltage threshold determining circuit and configured to detect a voltage of the first terminal of the high-side switch, wherein, when the voltage drop suppression circuit determines that the voltage of the first terminal of the high-side switch is higher than the voltage threshold indicated by the voltage threshold indicating signal from the voltage threshold determining circuit, the voltage drop suppression circuit pulls down the voltage of the first terminal of the high-side switch.