US 12,088,195 B2
Resonant converter with multiple resonant tank circuits
Junjie Feng, Campbell, CA (US); Xu Han, Hangzhou (CN); Fengchun He, Hangzhou (CN); Daocheng Huang, Cupertino, CA (US); and Yuhang Sun, Hangzhou (CN)
Assigned to Monolithic Power Systems, Inc., Kirkland, WA (US)
Filed by Monolithic Power Systems, Inc., San Jose, CA (US)
Filed on Nov. 6, 2023, as Appl. No. 18/502,971.
Application 18/502,971 is a continuation of application No. 17/881,937, filed on Aug. 5, 2022, granted, now 11,855,530.
Prior Publication US 2024/0072653 A1, Feb. 29, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/00 (2006.01); H02M 1/12 (2006.01); H02M 3/335 (2006.01)
CPC H02M 3/01 (2021.05) [H02M 1/12 (2013.01); H02M 3/33573 (2021.05); H02M 3/33576 (2013.01); H02M 3/33592 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A resonant converter comprising:
an input voltage node configured to receive a DC input voltage;
an output voltage node configured to provide a DC output voltage;
an inverter circuit comprising a first switch, a second switch, a third switch, and a fourth switch, first terminals of the first switch and the third switch are connected to the input voltage node, a second terminal of the first switch is connected to a first terminal of the second switch at a first bridge node, and a second terminal of the third switch is connected to a first terminal of the fourth switch at a second bridge node;
a primary resonant tank circuit comprising a first resonant capacitor, a first resonant inductor, and a primary winding of a transformer that are connected in series between the first bridge node and the second bridge node;
a rectifier connected to a secondary winding of the transformer;
a secondary resonant tank circuit disposed between the secondary winding of the transformer and the output voltage node, the secondary resonant tank circuit comprising a second resonant capacitor and a second resonant inductor, a tank node of the secondary resonant tank circuit is formed between terminals of the second resonant capacitor and the second resonant inductor; and
a capacitor, a first end of the capacitor is connected to the second terminals of the second and fourth switches, a second end of the capacitor is connected to a ground, and the first end of the capacitor is further connected to the tank node,
wherein the tank node of the secondary resonant tank circuit is connected to the first bridge node through the second switch, and is connected to the second bridge node through the fourth switch.