Abstract: A transformer and a power supply device. In the transformer, the first secondary coil including: first and second plate coils; and a first holding portion formed therebetween, the second secondary coil including: third and fourth plate coils; and a second holding portion formed therebetween, the first secondary coil is arranged between the third and fourth coils, the ends of the first plate coil and third plate coil are connected by solder, and the ends of the second plate coil and fourth plate coil are connected by solder, when the secondary-side rectifier circuit is a center-tapped rectifier circuit, the first holding portion, the second holding portion, and the bus bar are connected by solder through the connection hole, when the secondary-side rectifier circuit is a rectifier circuit other than the center-tapped rectifier circuit, the first holding portion and the second holding portion are connected by solder through the connection hole.

Abstract: A coil component includes: first and second magnetic cores having first and second flat plate portions; a winding having a hollow core portion; first and second heat dissipation metal plates having first and second heat dissipation plane and first and second heat conduction portions, at least either one of the first and second flat plate portions has a middle leg, the middle leg is inserted into the hollow core portion of a winding, and the first magnetic core and the second magnetic core are combined in such a way that the first flat plate portion and the second flat plate portion face each other, the first heat dissipation plane portion is closely attached to the first flat plate portion and the second heat dissipation plane portion is closely attached to the second flat plate portion, the first heat conduction portion is connected to the second heat conduction portion.

Abstract: A drive circuit driving a first switching element, including: a first diode with a cathode terminal connected to a first switching element gate terminal; a second switching element with a first terminal connected to a first diode anode terminal, a second terminal connected to a first switching element gate terminal, a third terminal connected to a first switching element source terminal; a third switching element with a drain terminal connected to the first diode anode terminal, and a source terminal connected to the first switching element source terminal; a parallel circuit; and a drive transformer having a coil, one end connected to the drain terminal, the other end connected to the third switching element gate terminal, and connected to the third switching element source terminal, one end of the parallel circuit connected to one coil end, the second diode cathode terminal connected to the other end of the coil.

Abstract: A transformer and a power supply device. In the transformer, the first secondary coil including: first and second plate coils; and a first holding portion formed therebetween, the second secondary coil including: third and fourth plate coils; and a second holding portion formed therebetween, the first secondary coil is arranged between the third and fourth coils, the ends of the first plate coil and third plate coil are connected by solder, and the ends of the second plate coil and fourth plate coil are connected by solder, when the secondary-side rectifier circuit is a center-tapped rectifier circuit, the first holding portion, the second holding portion, and the bus bar are connected by solder through the connection hole, when the secondary-side rectifier circuit is a rectifier circuit other than the center-tapped rectifier circuit, the first holding portion and the second holding portion are connected by solder through the connection hole.

Abstract: A drive circuit driving a first switching element, including: a first diode with a cathode terminal connected to a first switching element gate terminal; a second switching element with a first terminal connected to a first diode anode terminal, a second terminal connected to a first switching element gate terminal, a third terminal connected to a first switching element source terminal; a third switching element with a drain terminal connected to the first diode anode terminal, and a source terminal connected to the first switching element source terminal; a parallel circuit; and a drive transformer having a coil, one end connected to the drain terminal, the other end connected to the third switching element gate terminal, and connected to the third switching element source terminal, one end of the parallel circuit connected to one coil end, the second diode cathode terminal connected to the other end of the coil.

Abstract: A coil component includes: first and second magnetic cores having first and second flat plate portions; a winding having a hollow core portion; first and second heat dissipation metal plates having first and second heat dissipation plane and first and second heat conduction portions, at least either one of the first and second flat plate portions has a middle leg, the middle leg is inserted into the hollow core portion of a winding, and the first magnetic core and the second magnetic core are combined in such a way that the first flat plate portion and the second flat plate portion face each other, the first heat dissipation plane portion is closely attached to the first flat plate portion and the second heat dissipation plane portion is closely attached to the second flat plate portion, the first heat conduction portion is connected to the second heat conduction portion.