A driving circuit controls driving of a switching element by outputting a driving signal to the switching element. The driving circuit includes an air-core transformer having a plurality of primary windings and a secondary winding magnetically coupled to each of the plurality of primary windings. An AC signal is input to each of the plurality of primary windings of the air-core transformer. The plurality of primary windings includes a first primary winding and a second primary winding. There is a phase difference between an AC signal input to the first primary winding and an AC signal input the second primary winding.

A transformer includes primary and secondary coils that each include first and second sections that each include first and second sets of turns. In the parallel-connected first and second sections of the primary coil, the second set of turns of the second section is positioned within the first set of turns of the first section, and the second set of turns of the first section is positioned within the first set of turns of the second section. In the parallel-connected first and second sections of the secondary coil, the second set of turns of the second section is positioned within the first set of turns of the first section, and the second set of turns of the first section is positioned within the first set of turns of the second section, when viewed along a common winding axis. The turns of the primary and secondary coils are interleaved.

A transformer includes primary and secondary coils that each include first and second sections that each include first and second sets of turns. In the parallel-connected first and second sections of the primary coil, the second set of turns of the second section is positioned within the first set of turns of the first section, and the second set of turns of the first section is positioned within the first set of turns of the second section. In the parallel-connected first and second sections of the secondary coil, the second set of turns of the second section is positioned within the first set of turns of the first section, and the second set of turns of the first section is positioned within the first set of turns of the second section, when viewed along a common winding axis. The turns of the primary and secondary coils are interleaved.

A coiled electronic component includes: an electronic component body which includes a coil portion having a spiral structure and formed of an electrically conductive material, and electrically conductive connection portions arranged on both ends of the coil portion; and a pair of electrodes for respectively connecting the electrically conductive connection portions to assembly portions arranged on an assembly object. The electrode includes a pair of pinching pieces for pinching the electrically conductive connection portion, and the pair of pinching pieces is opened in a manner that the electrically conductive connection portion is received and fitted therebetween.

A coiled electronic component includes: an electronic component body which includes a coil portion having a spiral structure and formed of an electrically conductive material, and electrically conductive connection portions arranged on both ends of the coil portion; and a pair of electrodes for respectively connecting the electrically conductive connection portions to assembly portions arranged on an assembly object. The electrode includes a pair of pinching pieces for pinching the electrically conductive connection portion, and the pair of pinching pieces is opened in a manner that the electrically conductive connection portion is received and fitted therebetween.

The disclosed is the power saving device capable of reducing power consumption by maintaining a constant output voltage even when an input voltage changes, and more particularly, the power saving device capable of improving the performance and lifespan of a load by stably adjusting a supplied voltage through the toroidal core, the multi-channel switch, and the control means for controlling the same and then supplying it to the load side and also reducing power consumption accordingly, and particularly, safely and firmly fixing the toroidal core in which the primary coil and the secondary coil are wound inside the power saving device by using the core fixing members and also preventing a temperature rise by easily discharging the heat generated in the toroidal core out of the device.

The disclosed is the power saving device capable of reducing power consumption by maintaining a constant output voltage even when an input voltage changes, and more particularly, the power saving device capable of improving the performance and lifespan of a load by stably adjusting a supplied voltage through the toroidal core, the multi-channel switch, and the control means for controlling the same and then supplying it to the load side and also reducing power consumption accordingly, and particularly, safely and firmly fixing the toroidal core in which the primary coil and the secondary coil are wound inside the power saving device by using the core fixing members and also preventing a temperature rise by easily discharging the heat generated in the toroidal core out of the device.

A charger for charging a device to be inductively charged is described, comprising an excitation coil made of an electrical conductor wound around a toroidal core to excite a magnetic field inside the toroidal core, the toroidal core having an air-gap between two end-faces of the toroidal core, wherein the two end-faces are facing each other, and the winding density of the excitation coil along the toroidal length of the toroidal core is higher in the vicinity of the respective end-faces as compared to the remaining parts of the toroidal core.

For predictive synchronous rectifier sensing and control, an example apparatus includes an air core toroid having a voltage output, the air core toroid adapted to surround a portion of a current path and adapted to be coupled through the current path to a transformer, and a control logic circuit having a voltage input and a control output, the voltage input coupled to the voltage output, and the control output adapted to be coupled to a switch.

For predictive synchronous rectifier sensing and control, an example apparatus includes an air core toroid having a voltage output, the air core toroid adapted to surround a portion of a current path and adapted to be coupled through the current path to a transformer, and a control logic circuit having a voltage input and a control output, the voltage input coupled to the voltage output, and the control output adapted to be coupled to a switch.