US 9,812,974 B2
Resonant inverter and isolated resonant power supply device
Katsunori Imai, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Mar. 28, 2016, as Appl. No. 15/82,753.
Claims priority of application No. 2015-096988 (JP), filed on May 12, 2015.
Prior Publication US 2016/0336865 A1, Nov. 17, 2016
Int. Cl. H02M 3/335 (2006.01); H02M 7/537 (2006.01); H02M 7/48 (2007.01)
CPC H02M 3/33546 (2013.01) [H02M 3/33576 (2013.01); H02M 3/33592 (2013.01); H02M 7/537 (2013.01); H02M 2007/4815 (2013.01); Y02B 70/1433 (2013.01); Y02B 70/1441 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A resonant inverter comprising:
an input terminal to which an input voltage is applied;
a first switch and a second switch that are alternately turned on and off;
a transformer that includes a first winding and a second winding on a primary side;
a first resonant circuit that includes a first capacitive element and a first coil; and
a second resonant circuit that includes a second capacitive element and a second coil, wherein
the first switch, the first winding, and the first resonant circuit constitute a first inverter circuit,
the second switch, the second winding, and the second resonant circuit constitute a second inverter circuit,
the input terminal is connected between the first winding and the second winding of the transformer,
the first capacitive element is connected in parallel to the first switch,
the second capacitive element is connected in parallel to the second switch,
the first coil is placed between the first switch and the first winding, and
the second coil is placed between the second switch and the second winding.