Toko Kabushiki Kaisha

Shigeo Abe

Hideki Kojima

Kazuhiro Nakayama

Toshio Mikami

A switching power transmission device includes a transformer having primary and secondary windings, and two driving windings, the transformer being connected with an inductance and a capacitor. First and second switch circuits are connected to input power and the transformer so as to switch the current flow in the primary winding to produce a switched output on the secondary winding. A current, flowing through the first switching device, is detected by a current detecting device to control the current flow based on the detected value of the current.

Switching power transmission device

A conventional braided wire has high direct current resistance and high winding resistance in high-frequency regions, making it impossible to achieve a power conversion transformer having sufficient conversion efficiency. In the present invention, a braided wire is braided from three or more cluster wires, each comprising multiple strands, and is used as winding material for a leakage flux-type power conversion transformer. The braid pitch of the braided wire is set so that the ratio between one-turn winding length and the braid pitch is between 0.5 and 2.5.

Leakage flux-type power conversion transformer

A non-contact charger wherein a battery-driven electronic device containing a secondary battery is provided in a power supply section and electrical power is supplied thereto by non-contact, the non-contact charger including: a primary side coil and a secondary side coil, the primary side coil supplying power to the secondary side coil by electromagnetic induction, the primary side and secondary side coils being provided to face each other with a case therebetween; the primary side coil containing a U-shaped magnetic core having a leg at each end thereof, and windings which are wound around the magnetic legs; and the secondary side coil containing a U-shaped magnetic core having a leg at each end thereof, and a winding which is wound around a common magnetic core of the U-shaped magnetic core; the cross-sectional area of the magnetic legs of the primary side coil being greater than the cross-sectional area of the magnetic legs of the secondary side coil.

Non-contact charger

A heat-dissipating structure for a switching power supply characterized in that the respective portions of the power supply lines on the hot side and the cold side connected respectively to the output terminals after a switching element are formed by plate conductors, and connected to said power supply lines, and that the heat generating circuit elements placed at the top, thereunder the plate conductor on one side, a heat conductive insulator, the plate conductor on the other side, and another heat conductive insulator are sequentially overlaid and fixed on a box member.

Heat-dissipating structure for a switching power supply

A switching power source having a rectifier circuit and smoothing capacitor for obtaining a d.c. power from an a.c. input, an oscillator circuit constructed of a serial circuit of a primary winding of a power transformer and a switching element for intermittently turning on and off the d.c. power, the power transformer having another winding of the power transformer for detecting the oscillation state of the oscillator circuit, and a rush current preventing circuit constructed of a parallel circuit of a resistor and a thyristor for turning on the thyristor upon reception of a signal from another winding, the rush current preventing circuit being connected at the input side of the rectifier circuit or between the output side of the rectifier circuit and the smoothing capacitor, the switching power source comprising a detector circuit for generating a signal when the interception period of the a.c. input exceeds a first setting time; and an oscillation stopping circuit for stopping the operation of the oscillator circuit for a second setting time in response to the signal from the detector circuit, and when the a.c. input is supplied at the time other than while the operation of the oscillator circuit is being stopped for the second setting time in response to the signal from the detector circuit, directly starting the operation of the oscillator circuit after a lapse of at least the second setting time after the time when the a.c. input was supplied.

Growing community of inventors

Tsurugashima, Japan

Shigeo Abe