Abstract: An electronic device includes a shielding member, an electric circuit, and a filter capacitor. The electric circuit has an output line and is arranged inside the shielding member. The filter capacitor is arranged outside the shielding member to be connected to the output line.

Abstract: A magnetic core includes a first core and a second core made of a material whose magnetic permeability is smaller than that of the first core and having an end. The end of the second core is in contact with the first core so that the first core and the second core cooperate to form a closed magnetic circuit. The area of contact between the end of the second core and the first core is larger than the area of the cross-section of the end as taken perpendicularly to the extending direction of the end of the second core.

Abstract: An active clamp DC-DC converter includes a transformer having a primary coil and a secondary coil, a main switching device connected in series to the primary coil of the transformer so that the main switching device and the primary coil are connected in parallel to a DC power source, a reset capacitor, a reset switching device connected in series to the reset capacitor so that the reset switching device and the reset capacitor are connected in parallel to the primary coil of the transformer, a rectifying circuit connected to the secondary coil of the transformer, a smoothing circuit connected to the rectifying circuit, and a control circuit adjusting a dead time that elapses from the time when the reset switching device is turned off until the time when the main switching device is turned on, based on a voltage across the main switching device.

Abstract: A transformer 10 has a first core CR1, a second core CR2, a first transformer primary winding W1, a coil 45, a coil 46 and a coil 47. The second core CR2 is integrally formed with the first core CR1. The first transformer primary winding W1 is wound onto the first core CR1. The coil 45 is wound onto the first core CR1 and forms a transformer T1 together with the first transformer primary winding W1. The coil 46 is wound around the first core CR1 and forms a transformer T2 together with the first transformer primary winding W1. The coil 47 is connected to the coil 45 and coil 46 and forms an output coil using the second core CR2 as a magnetic core.

Abstract: An apparatus, system, and method for fast all-optical switching is presented. In one embodiment, the apparatus includes a first light transmitting medium. The apparatus may also include a second light transmitting medium coupled to the first light transmitting medium and disposed to form an interface region between the first light transmitting medium and the second light transmitting medium. Additionally, the apparatus may include a plurality of Lambda atoms disposed in the interface region, the Lambda atoms adapted to cause Electromagnetically-Induced Transparency (EIT) in the interface region in response to an incident photon.

Abstract: A DC-DC converter using a plurality of transformers capable of decreasing the loss, preventing heat generation of transformers, and improving the heat transfer property of the core, and an integrated type transformer used in this DC-DC converter. A terminal T1 in which a negative electromotive force is generated and a terminal TR2 in which a positive electromotive force is generated, while a switching element Q1 is conducting, are connected at a node N1. An output coil L1 and output terminals TO1 and TO2 are provided on a current route shared by transformers T1 and T2. Diodes D1 and D2 are respectively inserted in a forward direction from a node N3 toward a terminal TR3 and in a forward direction from the node N3 toward a terminal TR4. An operation of a first transformer and an operation of a second transformer are respectively assigned to a flyback operation and a forward operation.

Abstract: A transformer 10 has a first core CR1, a second core CR2, a first transformer primary winding W1, a coil 45, a coil 46 and a coil 47. The second core CR2 is integrally formed with the first core CR1. The first transformer primary winding W1 is wound onto the first core CR1. The coil 45 is wound onto the first core CR1 and forms a transformer T1 together with the first transformer primary winding W1. The coil 46 is wound around the first core CR1 and forms a transformer T2 together with the first transformer primary winding W1. The coil 47 is connected to the coil 45 and coil 46 and forms an output coil using the second core CR2 as a magnetic core.

Abstract: A DC-DC converter using a plurality of transformers capable of decreasing the loss, preventing heat generation of transformers, and improving the heat transfer property of the core, and an integrated type transformer used in this DC-DC converter. A terminal T1 in which a negative electromotive force is generated and a terminal TR2 in which a positive electromotive force is generated, while a switching element Q1 is conducting, are connected at a node N1. An output coil L1 and output terminals TO1 and TO2 are provided on a current route shared by transformers T1 and T2. Diodes D1 and D2 are respectively inserted in a forward direction from a node N3 toward a terminal TR3 and in a forward direction from the node N3 toward a terminal TR4. An operation of a first transformer and an operation of a second transformer are respectively assigned to a flyback operation and a forward operation.

Abstract: A method for controlling a bidirectional DC-DC converter that reduces switching loss during a step-down operation and conduction loss caused by synchronous rectification, while enabling bidirectional operation with the same control. The DC-DC converter includes first and second switch elements for alternately applying voltage in opposite directions to a transformer winding during the step-down operation and performing synchronous rectification during a step-up operation. Third and fourth switch elements perform synchronous rectification during the step-down operation and alternately apply voltage in opposite directions to the transformer in the step-up operation. The method includes activating the first switch when the third switch is in an active state, activating the second switch when the fourth switch is in an active state, switching each of the third and forth switches between an active state and an inactive state while inactivating the third or fourth switch.