Abstract: According to an embodiment, a bandgap type reference voltage generation circuit includes a first node that is connected to an output terminal, second and third nodes that are connected to current sources, a fourth node, first and second bipolar junction transistors with bases that are connected to the first node, a third bipolar junction transistor that is provided with an emitter-collector path that is connected between the second node and the fourth node and amplifies an output current of the first bipolar junction transistor, and a fourth bipolar junction transistor that is provided with an emitter-collector path that is connected between the third node and the fourth node and amplifies an output current of the second bipolar junction transistor.

Abstract: LED drive control circuitry according to one embodiment outputs an LED drive control signal serving as driving a light emitting diode included in a photocoupler that performs insulation communication in synchronization with a reference clock signal. The LED drive control circuit includes a duty cycle changer that changes a duty cycle of the LED drive control signal in accordance with the reference clock signal and a signal synchronized with the reference clock signal.

Abstract: According to one aspect of embodiments, a drive circuit of a normally-ON transistor includes: a normally-OFF transistor that includes a main current path connected in serial to a main current path of the normally-ON transistor; and a buffer circuit that supplies, to a gate of the normally-ON transistor, a control signal for controlling turning ON and OFF of the normally-ON transistor, whose high-voltage side and low-voltage side are biased by a bias voltage supplied from a power source unit.

Abstract: According to an embodiment, a bandgap type reference voltage generation circuit includes a first node that is connected to an output terminal, second and third nodes that are connected to current sources, a fourth node, first and second bipolar junction transistors with bases that are connected to the first node, a third bipolar junction transistor that is provided with an emitter-collector path that is connected between the second node and the fourth node and amplifies an output current of the first bipolar junction transistor, and a fourth bipolar junction transistor that is provided with an emitter-collector path that is connected between the third node and the fourth node and amplifies an output current of the second bipolar junction transistor.

Abstract: LED drive control circuitry according to one embodiment outputs an LED drive control signal serving as driving a light emitting diode included in a photocoupler that performs insulation communication in synchronization with a reference clock signal. The LED drive control circuit includes a duty cycle changer that changes a duty cycle of the LED drive control signal in accordance with the reference clock signal and a signal synchronized with the reference clock signal.

Abstract: LED drive control circuitry according to one embodiment outputs an LED drive control signal serving as driving a light emitting diode included in a photocoupler that performs insulation communication in synchronization with a reference clock signal. The LED drive control circuit includes a duty cycle changer that changes a duty cycle of the LED drive control signal in accordance with the reference clock signal and a signal synchronized with the reference clock signal.

Abstract: According to one aspect of embodiments, a drive circuit of a normally-ON transistor includes: a normally-OFF transistor that includes a main current path connected in serial to a main current path of the normally-ON transistor; and a buffer circuit that supplies, to a gate of the normally-ON transistor, a control signal for controlling turning ON and OFF of the normally-ON transistor, whose high-voltage side and low-voltage side are biased by a bias voltage supplied from a power source unit.

Abstract: According to one aspect of embodiments, a drive circuit of a normally-ON transistor includes: a normally-OFF transistor that includes a main current path connected in serial to a main current path of the normally-ON transistor; and a buffer circuit that supplies, to a gate of the normally-ON transistor, a control signal for controlling turning ON and OFF of the normally-ON transistor, whose high-voltage side and low-voltage side are biased by a bias voltage supplied from a power source unit.

Abstract: According to one aspect of embodiments, a drive circuit of a normally-ON transistor includes: a normally-OFF transistor that includes a main current path connected in serial to a main current path of the normally-ON transistor; and a buffer circuit that supplies, to a gate of the normally-ON transistor, a control signal for controlling turning ON and OFF of the normally-ON transistor, whose high-voltage side and low-voltage side are biased by a bias voltage supplied from a power source unit.

Abstract: LED drive control circuitry according to one embodiment outputs an LED drive control signal serving as driving a light emitting diode included in a photocoupler that performs insulation communication in synchronization with a reference clock signal. The LED drive control circuit includes a duty cycle changer that changes a duty cycle of the LED drive control signal in accordance with the reference clock signal and a signal synchronized with the reference clock signal.

Abstract: According to one embodiment, in a magnetic coupler, a plurality of coils includes a first pattern and a second pattern. The first pattern includes a first winding portion and a second winding portion. The second winding portion is arranged in a first direction to the first winding portion. The second pattern is disposed adjacent to the first pattern along the first plane. The second pattern is arranged at a position corresponding to a boundary between the first winding pattern and the second winding pattern. The second pattern includes a third winding portion and a fourth winding portion. The fourth winding portion is arranged in a second direction to the third winding portion. The second direction is a different direction from the first direction. The fourth winding portion is wound in a reversed direction with the third winding portion.

Abstract: According to one embodiment, there is provided a magnetic coupler including a first coil, a second coil and a first electric shield. The second coil faces the first coil. The first electric shield is disposed between the first coil and the second coil and electrically connected to a reference node of a circuit on the first coil side or the second coil side.

Abstract: According to one embodiment, in a magnetic coupler, a plurality of coils includes a first pattern and a second pattern. The first pattern includes a first winding portion and a second winding portion. The second winding portion is arranged in a first direction to the first winding portion The second pattern is disposed adjacent to the first pattern along the first plane. The second pattern is arranged at a position corresponding to a boundary between the first winding pattern and the second winding pattern. The second pattern includes a third winding portion and a fourth winding portion. The fourth winding portion is arranged in a second direction to the third winding portion. The second direction is a different direction from the first direction. The fourth winding portion is wound in a reversed direction with the third winding portion.

Abstract: A foreign object detection device has a foreign object detector configured to detect a foreign object when a power receiver receives power from a power transmitter in a non-contact manner, the foreign object detector being arranged between the power receiver and the power transmitter, and a power control signal generator configured to generate a power control signal which controls the power transmitted from the power transmitter when the foreign object is detected by the foreign object detector

Abstract: According to one embodiment, there is provided a control apparatus for a first wireless power transmission apparatus and a second wireless power transmission apparatus. The first wireless power transmission apparatus includes a first inductor and an alternating-current signal source that supplies an alternating-current power to the first inductor. The second wireless power transmission apparatus includes a second inductor that receives the alternating-current power wirelessly from the first inductor. The position controller controls a phase relationship of current flowing in the first inductor and the second inductor such that attractive force or repulsive force is generated between the first and second inductors, and adjusts a relative position of the first inductor and the second inductor by use of the attractive force or the repulsive force.