US 12,470,134 B2
Resonant converter having switch on-time control mechanism
Jing-Yuan Lin, New Taipei (TW); Yan-Cheng Hou, Chiayi County (TW); and Yi-Feng Lin, Yilan County (TW)
Assigned to NATIONAL TAIWAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, Taipei (TW)
Filed by National Taiwan University of Science and Technology, Taipei (TW)
Filed on Dec. 25, 2023, as Appl. No. 18/395,722.
Claims priority of application No. 112141667 (TW), filed on Oct. 31, 2023.
Prior Publication US 2025/0141347 A1, May 1, 2025
Int. Cl. H02M 3/00 (2006.01); H02M 3/335 (2006.01)
CPC H02M 3/01 (2021.05) [H02M 3/33573 (2021.05); H02M 3/33576 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A resonant converter having a switch on-time control mechanism, comprising:
a primary-side switch circuit including a plurality of primary-side upper switches and a plurality of primary-side lower switches, wherein a first terminal of each of the plurality of primary-side upper switches is connected to a positive terminal of an input power source, second terminals of the plurality of primary-side upper switches are respectively connected to first terminals of the plurality of primary-side lower switches, and a second terminal of each of the plurality of primary-side lower switches is connected to a negative terminal of the input power source;
a primary-side resonant circuit connected to nodes between the second terminals of the plurality of primary-side upper switches and the first terminals of the plurality of primary-side lower switches;
a secondary-side switch circuit including a plurality of secondary-side upper switches and a plurality of secondary-side lower switches, wherein a first terminal of each of the plurality of secondary-side upper switches is connected to a first terminal of a load, second terminals of the plurality of secondary-side upper switches are respectively connected to first terminals of the plurality of secondary-side lower switches, and a second terminal of each of the plurality of secondary-side lower switches is connected to a second terminal of the load;
a secondary-side resonant circuit connected to nodes between the second terminals of the plurality of secondary-side upper switches and the first terminals of the plurality of secondary-side lower switches;
a transformer, wherein a primary-side of the transformer is connected to the primary-side resonant circuit, and a secondary-side of the transformer is connected to the secondary-side resonant circuit; and
a control circuit connected to a control terminal of each of the plurality of primary-side upper switches, a control terminal of each of the plurality of primary-side lower switches, a control terminal of each of the plurality of secondary-side upper switches and a control terminal of each of the plurality of secondary-side lower switches;
wherein the control circuit controls on-times and switching frequencies of the primary-side switch circuit and the secondary-side switch circuit to extend time within which power is transmitted from the input power source through the primary-side switch circuit, the primary-side resonant circuit and the transformer to the secondary-side resonant circuit, and stored in the secondary-side resonant circuit, such that the secondary-side resonant circuit supplies more power to the load.