A multi-voltage domain device includes a semiconductor layer including a first voltage domain, a second voltage domain, and an isolation region that electrically isolates the first voltage domain and the second voltage domain in a lateral direction. The isolation region includes at least one deep trench isolation barrier. A layer stack is arranged on the semiconductor layer and includes a stack insulator layer, a first coil arranged in the stack insulator layer, and a second coil arranged in the stack insulator layer and laterally separated from the first coil in the lateral direction. The first and second coils are magnetically coupled to each other in the lateral direction. The first coil includes terminals arranged vertically over the first region and are electrically coupled to the first voltage domain, and the second coil includes terminals arranged vertically over the second region and are electrically coupled to the second voltage domain.

Various embodiments may relate to a synchronous rectifier including at least one rectifier cell, to which power is supplied via a secondary winding of a transformer arranged between the input connections of the synchronous rectifier. The rectifier cell comprises a bipolar main switch operated in the inverse mode, wherein an energy store is provided in the base line of the bipolar main switch, which energy store, in conjunction with an auxiliary switch which is concomitantly controlled by the relevant secondary winding for the bipolar main switch, ensures that the main switch is switched off prior to the end of the inverse phase.

Various embodiments may relate to a synchronous rectifier including at least one rectifier cell, to which power is supplied via a secondary winding of a transformer arranged between the input connections of the synchronous rectifier. The rectifier cell comprises a bipolar main switch operated in the inverse mode, wherein an energy store is provided in the base line of the bipolar main switch, which energy store, in conjunction with an auxiliary switch which is concomitantly controlled by the relevant secondary winding for the bipolar main switch, ensures that the main switch is switched off prior to the end of the inverse phase.

A signal transmission circuit transmitting abnormality signals from a primary side circuit to a secondary side circuit is provided, in which the primary side circuit includes switching elements driven by drive circuits, the secondary circuit including a receiving unit receiving the abnormality signals transmitted from the primary side circuit.

The signal transmission circuit includes: a plurality of isolation elements that electrically isolate the primary side circuit and the secondary side circuit, and allows the abnormality signals to be transmitted therethrough; and a logic circuit that receives the abnormality signals from the isolation elements, outputting a predetermined signal indicating an occurrence of an abnormality when at least one of the switching elements shows the abnormality.

The isolation elements transmit the abnormality signals relative to a predetermined reference voltage in the secondary side circuit and the predetermined signal outputted by the logic circuit is received by the receiving unit.

A device can include a first circuit configured to be exposed to a first environment, the first circuit comprising one or more first transfer inductors, and a second circuit isolated from the first circuit and configured to be exposed to a second environment, the second circuit comprising one or more second transfer inductors. The second environment can be a harsh environment. The first circuit and the second circuit can be wirelessly coupled via the one or more first transfer inductors and the one or more second transfer inductors to allow transfer of power and/or signals between the first circuit and the second circuit.

Provided is a driver board capable of miniaturizing itself while ensuring insulation voltage resistance performance. In the driver board: a transformer 114 is configured, so as to cross a first insulating region 120a, such that a primary side terminal 114a is connected to a primary side circuit 112a and a secondary side terminal 114b is connected to a secondary side circuit 113a; a power supply control IC 115 is configured, so as to cross a insulating region 120b, such that a primary side terminal 115a is connected to a primary side circuit 112b and a secondary side terminal 115b is connected to a secondary side circuit 113b; and the insulating region 120a and the insulating region 120b are formed so as to at least partially face each other via an insulating board 111 such that the primary side circuit 112a and the secondary side circuit 113b do not face each other via the insulating board and the primary side circuit 112b and the secondary side circuit 113a do not face each other via the insulating board.

According to one aspect, a transistor gate drive comprises a first input configured to be coupled to a DC voltage source, a second input configured to receive a control signal, a third input configured to couple to a ground connection, a transformer, a first switch configured to couple the first input to a first end of a primary winding of the transformer in response to receipt of the control signal, and to decouple the first input from the first end of the primary winding in response to the receipt of the control signal, a second switch configured to couple a second end of the primary winding to the third input in response to receipt of the control signal, and to decouple the second end of the primary winding from the third input in response to the receipt of the control signal.

According to one aspect, a transistor gate drive comprises a first input configured to be coupled to a DC voltage source, a second input configured to receive a control signal, a third input configured to couple to a ground connection, a transformer, a first switch configured to couple the first input to a first end of a primary winding of the transformer in response to receipt of the control signal, and to decouple the first input from the first end of the primary winding in response to the receipt of the control signal, a second switch configured to couple a second end of the primary winding to the third input in response to receipt of the control signal, and to decouple the second end of the primary winding from the third input in response to the receipt of the control signal.

Upper arm connection sections and lower arm connection sections are provided in parallel. An upper arm transformer and a power supply are provided in an area opposed to the lower arm connection sections with respect to the upper arm connection sections. A power supply control section is provided in at least one of an area opposed to the upper arm connection sections with respect to the upper arm transformer, and an area which is sandwiched between at least one of the upper and lower connection sections closest to one side of the substrate positioned in a direction in which the upper arm connection sections are arranged, and the one side. The lower arm transformer is provided in an area opposed to the upper arm connection sections with respect to the lower arm connection sections. The lower arm transformer is common to at least two of the lower arm switching elements.

Upper arm connection sections and lower arm connection sections are provided in parallel. An upper arm transformer and a power supply are provided in an area opposed to the lower arm connection sections with respect to the upper arm connection sections. A power supply control section is provided in at least one of an area opposed to the upper arm connection sections with respect to the upper arm transformer, and an area which is sandwiched between at least one of the upper and lower connection sections closest to one side of the substrate positioned in a direction in which the upper arm connection sections are arranged, and the one side. The lower arm transformer is provided in an area opposed to the upper arm connection sections with respect to the lower arm connection sections. The lower arm transformer is common to at least two of the lower arm switching elements.