US 12,316,213 B2
Snubber circuit
Kyung Hyun Kim, Seoul (KR)
Assigned to LG INNOTEK CO., LTD., Seoul (KR)
Appl. No. 17/788,621
Filed by LG INNOTEK CO., LTD., Seoul (KR)
PCT Filed Nov. 25, 2020, PCT No. PCT/KR2020/016782
§ 371(c)(1), (2) Date Jun. 23, 2022,
PCT Pub. No. WO2021/137441, PCT Pub. Date Jul. 8, 2021.
Claims priority of application No. 10-2019-0177707 (KR), filed on Dec. 30, 2019.
Prior Publication US 2023/0029203 A1, Jan. 26, 2023
Int. Cl. H02M 1/34 (2007.01); H02M 3/335 (2006.01)
CPC H02M 1/344 (2021.05) [H02M 3/33576 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A snubber circuit connected to a secondary side switch of a transformer, the snubber circuit comprising:
a diode connected to an input terminal of the secondary side switch;
a capacitor connected to an output terminal of the diode;
a resistor connected in parallel with the capacitor;
a snubber switch directly connecting the resistor and a ground;
a sensing resistor connected to the input terminal of the secondary side switch and configured to detect voltage of the input terminal of the secondary side switch; and
an OP-AMP being inputted the detected voltage of the input terminal of the secondary side switch and a reference voltage, and output a high or low signal to a gate of the snubber switch through a comparison of the detected voltage of the input terminal of the secondary side switch with the reference voltage,
wherein a switching frequency of the snubber switch is less than or equal to a switching frequency of the secondary side switch, and
wherein the resistor is disposed in between the capacitor and the snubber switch.