US 12,294,304 B2
Buck-boost switching regulator capable of damping out the ringing and control method thereof
Shei-Chie Yang, Taichung (TW); Yuan-Yen Mai, Taipei (TW); Pao-Hsun Yu, Hsinchu (TW); and Cheng-Hung Hsu, Changhua (TW)
Assigned to RICHTEK TECHNOLOGY CORPORATION, Zhubei (TW)
Filed by Richtek Technology Corporation, Zhubei (TW)
Filed on Dec. 27, 2022, as Appl. No. 18/146,493.
Application 18/146,493 is a continuation in part of application No. 17/566,678, filed on Dec. 30, 2021, granted, now 11,736,013.
Claims priority of provisional application 63/298,679, filed on Jan. 12, 2022.
Claims priority of application No. 111121941 (TW), filed on Jun. 14, 2022.
Prior Publication US 2023/0216410 A1, Jul. 6, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/1582 (2013.01) [H02M 1/0054 (2021.05)] 26 Claims
OG exemplary drawing
 
1. A buck-boost switching regulator configured to convert an input power into an output power, comprising:
a power switch circuit, comprising an input switch unit and an output switch unit, wherein the input switch unit is configured to alternatingly connect a first end of an inductor to the input power or a ground potential, and the output switch unit is configured to alternatingly connect a second end of the inductor to the output power or the ground potential, so as to convert the input power into the output power;
a bypass control circuit, configured to generate a bypass control signal according to a conversion voltage difference between an input voltage of the input power and an output voltage of the output power and according to whether an inductor current flowing through the inductor reaches an output current of the output power; and
a bypass switching circuit, wherein when the conversion voltage difference is less than a reference voltage and when the inductor current flowing through the inductor reaches the output current, the bypass control signal controls the bypass switching circuit to electrically connect the input power to the output power, so that the buck-boost switching regulator operates in a bypass mode.