US 12,334,757 B2
Switching charger for supplying stable power
Chun-Kai Hsu, Hsinchu (TW); Chih-Heng Su, Hsinchu (TW); and Chih-Ning Chen, Taipei (TW)
Assigned to ANPEC ELECTRONICS CORPORATION, Hsinchu (TW)
Filed by ANPEC ELECTRONICS CORPORATION, Hsinchu (TW)
Filed on Jul. 19, 2022, as Appl. No. 17/868,054.
Claims priority of application No. 111117393 (TW), filed on May 10, 2022.
Prior Publication US 2023/0369868 A1, Nov. 16, 2023
Int. Cl. H02J 7/00 (2006.01); G05F 1/56 (2006.01); H03F 3/45 (2006.01); H03K 19/20 (2006.01)
CPC H02J 7/00047 (2020.01) [G05F 1/56 (2013.01); H03F 3/45475 (2013.01); H03K 19/20 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A switching charger for supplying stable power, comprising:
a switch circuit connected to an input power source and a first terminal of an inductor, a second terminal of the inductor being connected to a battery;
a plurality of operational amplifiers including:
a first operational amplifier, wherein a first input terminal of the first operational amplifier is connected to the battery, and a second input terminal of the first operational amplifier is coupled to a first reference voltage;
a second operational amplifier, wherein a first input terminal of the second operational amplifier is connected to the second terminal of the inductor, and a second input terminal of the second operational amplifier is connected to the battery;
a third operational amplifier, wherein a first input terminal of the third operational amplifier is connected to the input power source, and a second input terminal of the third operational amplifier is connected to a system circuit; and
a fourth operational amplifier, wherein a first input terminal of the fourth operational amplifier is connected to the battery, and a second input terminal of the fourth operational amplifier is connected to the second terminal of the inductor;
a first selector circuit connected to an output terminal of the third operational amplifier and an output terminal of the fourth operational amplifier, wherein the first selector circuit is configured to select one of a signal outputted by the third operational amplifier and a signal outputted by the fourth operational amplifier so as to output a first selected signal;
a second selector circuit connected to an output terminal of the first operational amplifier, an output terminal of the second operational amplifier and an output terminal of the first selector circuit, wherein the second selector circuit is configured to select one of the first selected signal, a signal outputted by the first operational amplifier and a signal outputted by the second operational amplifier so as to output a second selected signal; and
a control circuit connected to the second selector circuit and the switch circuit, and configured to control the switch circuit according to the second selected signal.