US 11,990,840 B2
LLC controller and control method for power converter
Yao-Tsung Chen, Zhubei (TW); and Kuan-Hsien Chou, Zhubei (TW)
Assigned to LEADTREND TECHNOLOGY CORPORATION, Zhubei (TW)
Filed by Leadtrend Technology Corporation, Zhubei (TW)
Filed on Jun. 15, 2022, as Appl. No. 17/840,864.
Claims priority of application No. 110141881 (TW), filed on Nov. 10, 2021.
Prior Publication US 2023/0147857 A1, May 11, 2023
Int. Cl. H02M 3/335 (2006.01); H02H 7/12 (2006.01); H02M 1/00 (2006.01); H02M 3/00 (2006.01); H02M 3/24 (2006.01)
CPC H02M 3/24 (2013.01) [H02H 7/1213 (2013.01); H02M 1/0009 (2021.05); H02M 3/01 (2021.05)] 11 Claims
OG exemplary drawing
 
1. A control method in use of a power converter comprising high-side and low-side switches connected in series between an input power line and a ground line, wherein the high-side and low-side switches are for driving a resonant circuit to resonate, and the power converter includes a detector detecting the resonant circuit to provide a detection signal representing a magnitude of resonance in the resonant circuit, the control method comprising:
providing a high-side control signal and a low-side control signal to control the high-side and low-side switches respectively;
detecting a duty cycle of one of the high-side and low-side switches;
determining a threshold in response to the duty cycle; and
triggering an over-current protection based on the threshold and the detection signal, wherein when the over-current protection is triggered, at least one of the high-side and low-side switches stops providing power to the resonant circuit, and the resonance subsides.