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3435 results about "Induction coil" patented technology

An induction coil or "spark coil" (archaically known as an inductorium or Ruhmkorff coil after Heinrich Rühmkorff) is a type of electrical transformer used to produce high-voltage pulses from a low-voltage direct current (DC) supply. To create the flux changes necessary to induce voltage in the secondary coil, the direct current in the primary coil is repeatedly interrupted by a vibrating mechanical contact called an interrupter. Invented in 1836 by Nicholas Callan, with additional research by Charles Grafton Page and others, the induction coil was the first type of transformer. It was widely used in x-ray machines, spark-gap radio transmitters, arc lighting and quack medical electrotherapy devices from the 1880s to the 1920s. Today its only common use is as the ignition coils in internal combustion engines and in physics education to demonstrate induction.

Position Detection System, Guidance System, Position Detection Method, Medical Device, and Medical Magnetic-Induction and Position-Detection System

InactiveUS20070244388A1Problem can be prevented from occurringImprove performanceEndoscopesDiagnostic recording/measuringGuidance systemResonance
There are provided a position detection system, a guidance system, and a position detection method which obviate the need for frequency adjustment of an alternating magnetic field used in position detection of a device and which allow the device to be made more compact and less expensive. There are included a device (capsule endoscope 20) provided with a magnetic induction coil, a drive coil 51 for generating an alternating magnetic field, a plurality of magnetic sensors 52 for detecting an induced magnetic field, a frequency determining section 50B for determining a position calculating frequency based on a resonance frequency of the magnetic induction coil, and a position analyzing unit 50A for calculating, at the position calculating frequency, at least one of the position and the orientation of the device 20 based on the difference between outputs from the magnetic sensors 52 when only the alternating magnetic field is applied and outputs from the magnetic sensors 52 when the alternating magnetic field and the induced magnetic field are applied; and at least one of a frequency range of the alternating magnetic field and an output frequency range of the magnetic field sensors is limited based on the position calculating frequency.


The invention relates to a cyclotron which can produce a beam of accelerated charged particles that are intended for the irradiation of at least one target (200). The inventive cyclotron consists of a magnetic circuit which essentially comprises: an electromagnet with at least two poles (1, 1′), namely an upper pole (1) and a lower pole (1′), which are disposed symmetrically in relation to a mid-plane (110) which is perpendicular to the central axis (100) of the cyclotron and which are separated by a gap (120) containing the circulating charged particles and return flux (2) in order to close the aforementioned magnetic circuit; and a pair of main induction coils (5, 5′) which are used to create an essentially-constant main induction field in the gap between poles 1 and 1′. The invention is characterised in that it comprises means of centring the above-mentioned beam, consisting of at least one pair of bucking coils (6, 7) which are supplied by an electrical source (8) and which can modulate the intensity of the main induction field produced by the main coils (5, 5′), in order to increase the intensity of the induction field in a first area of the cyclotron and to reduce the intensity of the induction field in a second area of the cyclotron, which is diametrically opposed to the central axis (100) of the cyclotron.

Electromagnetic heating type suction device used for heating non-combustible cigarette

The invention discloses an electromagnetic heating type suction device used for heating a non-combustible cigarette. The electromagnetic heating type suction device used for heating the non-combustible cigarette comprises an end cover, a heater and an electromagnetic induction system, wherein a heating cavity for holding the heated non-combustible cigarette is reserved in the heater, the end cover is detachably and combinably connected to the suction end portion of the heater, a filter tip is arranged on the end cover and is communicated with an inner cavity of the heating cavity, a round cover is arranged on the end cover, a plurality of air inlets are formed in the round cover and are communicated with the inner cavity of the heating cavity, the electromagnetic induction system comprises a temperature control circuit and an induction coil electrically connected onto the temperature control circuit, and the induction coil spirally winds the heating cavity. The electromagnetic heating type suction device used for heating the non-combustible cigarette has the advantages that a liner heating body is heated electromagnetically via the electromagnetic induction system, and the cigarette is heated by the liner heating body, so that heating speed can be increased, heating efficiency and heating speed are high, transient heating can be realized, needs for satisfying suction taste are met, heating is uniform, and the cigarette can be heated fully to prevent cigarette waste resulted from insufficient heating.

Magnetic stripe data transmission system and method for reliable data transmission and low power consumption

A magnetic stripe data transmission (MST) driver and a method for driving the MST are disclosed. The MST driver is configured to transmit magnetic strip data comprising of streams of pulses. The MST driver comprises a pair of high side switches and a pair of low side switches. The pair of high side switches comprises a first switch and a second switch. The pair of low side switches comprises a third switch and a fourth switch. The first, second, third and fourth switches are arranged in a full bridge type configuration connected across a voltage source and a ground. An inductive coil is connected across outputs of the full bridge type configuration of the switches. The MST driver includes a switch driver configured to drive the pair of low side switches and the pair of high side switches under current slope control using pulse width modulation. The driven load current has a rising portion and a falling portion through the inductive coil in a forward direction or in a reverse direction with programmable load current rising and falling slopes to induce a recognizable back electromagnetic force at a receiver emulating the magnetic strip data during the load current rising and falling portions and to reduce power loss during time periods without signal transmission.
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