US 12,224,675 B2
Voltage detection circuit, switching converter and integrated circuit
Jiabin Chen, Hangzhou (CN); and Hongxing Wang, Hangzhou (CN)
Assigned to Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed by Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed on May 18, 2022, as Appl. No. 17/747,282.
Claims priority of application No. 202110677238.8 (CN), filed on Jun. 18, 2021.
Prior Publication US 2022/0407428 A1, Dec. 22, 2022
Int. Cl. H02M 3/335 (2006.01); G01R 19/10 (2006.01); H02M 3/156 (2006.01)
CPC H02M 3/33592 (2013.01) [G01R 19/10 (2013.01); H02M 3/156 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A voltage detection circuit for a switching converter having a switch and a magnetic element connected in series, wherein a first terminal of the switch and a first terminal of the magnetic element are connected to a common node, the voltage detection circuit comprising:
a) a low-pass filter configured to receive a first voltage across the switch, and to generate a second voltage representing an average value of the first voltage;
b) wherein the second voltage represents a voltage between a second terminal of the switch and a second terminal of the magnetic element in a steady state of the switching converter; and
c) wherein the switching converter is configured as a Boost converter, the switch is connected between the common node and a negative input terminal of the switching converter, the magnetic element is connected to a positive input terminal of the switching converter and the common node, and the second voltage represents an input voltage of the switching converter.