59results about How to "High induced voltage" patented technology

A self-powered medical device, for example a pacemaker uses the variations of blood pressure inside the heart or a major artery to create a mechanical resonance in an electromagnetic or piezoelectric generator. The resonance extends the time power is generated during the cardiac cycle. The pressure variations compress a bellows carrying the resonant generator. The inside of the bellows may be evacuated to a partial or full vacuum, and a spring restores the bellows to the desired equilibrium point, acting against the blood pressure. The current pulses are stored in a capacitor. Eliminating the battery allows dramatic miniaturization of the medical device to the point it can be implanted at the point of desired stimulation via a catheter.

A magnet comprising grains of a ferromagnetic material whose main component is iron and a fluorine compound layer or an oxy-fluorine compound layer of fluoride compound particles of alkali metals, alkaline earth metals and rare earth elements, present on the surface of the ferromagnetic material grains, wherein an amount of iron atoms in the fluorine compound particles is 1 to 50 atomic %.

A brushless electrical machine, usable as a motor, generator, or alternator, has a rotor that is comprised of a rim portion and a substantially open center portion. The rim portion has a partially hollow core in which a stationary field coil is supported. Current to the field coil generates magnetic flux that circulates in a poloidal flux path in the rim, crossing a single magnetic air gap formed by the rim. Protrusions in the rim located around the circumference form poles all having the same polarity. As the rotor rotates, the flux exiting the poles passes through multiple stationary armature windings around the circumference that are located in the single air gap. An AC voltage is induced in the armature windings from rotation.

Certain embodiments of the present invention provide a battery heating circuit, comprising a switch unit 1, a switching control module 100, a damping component R1, an energy storage circuit, and an energy superposition unit; the energy storage circuit is configured to connect with the battery to form a loop, and comprises a current storage component L1 and a charge storage component C1; the damping component R1, the switch unit 1, the current storage component L1, and the charge storage component C1 are connected in series; the switching control module 100 is connected with the switch unit 1, and is configured to control ON/OFF of the switch unit 1, so as to control the energy flowing between the battery and the energy storage circuit.

Certain embodiments of the present invention provide a battery heating circuit, comprising a switch unit (1), a switching control module (100), a damping component R1, an energy storage circuit, and an energy superposition unit, the energy storage circuit is configured to connect with the battery to form a loop, and comprises a current storage component L1 and a charge storage component C1; the damping component R1, the switch unit (1), the current storage component L1, and the charge storage component C1 are connected in series; the switching control module (100) is connected with the switch unit (1), and is configured to control ON/OFF of the switch unit (1), so as to control the energy flowing between the battery and the energy storage circuit; the energy superposition unit is connected with the energy storage circuit, and is configured to superpose the energy in the energy storage circuit with the energy in the battery when the switch unit (1) switches on and then switches off; the switching control module (100) is also configured to control the switch unit (1) to switch off after the first positive half cycle of current flow through the switch unit (1) after the switch unit (1) switches on, and the voltage applied to the switch unit (1) at the time the switch unit (1) switches off is lower than the voltage rating of the switch unit (1).

Characteristics of a magnetic material are improved without using a heavy rare earth element as a scarce resource. By incorporating fluorine into a magnetic powder and controlling the crystal orientation in crystal grains, a magnetic material securing magnetic characteristics such as coercive force and residual flux density can be fabricated. As a result, the resource problem with heavy rare earth elements can be solved, and the magnetic material can be applied to magnetic circuits that require a high energy product, including various rotating machines and voice coil motors of hard discs.

Certain embodiments of the present invention provide a battery heating circuit, comprising a switch unit (1), a switching control module (100), a damping component R1, an energy storage circuit, a freewheeling circuit (20), and an energy superposition unit, the energy storage circuit is configured to connect with the battery to form a loop, and comprises a current storage component L1 and a charge storage component C1; the damping component R1, the switch unit (1), the current storage component L1, and the charge storage component C1 are connected in series; the switching control module (100) is connected with the switch unit (1), and is configured to control ON/OFF of the switch unit (1), so as to control the energy flowing between the battery and the energy storage circuit; the energy superposition unit is connected with the energy storage circuit, and is configured to superpose the energy in the energy storage circuit with the energy in the battery when the switch unit (1) switches on and then switches off; the freewheeling circuit (20) is configured to form a serial loop with the battery and the current storage component L1 to sustain current flow in the battery after the switch unit (1) switches on and then switches off.

A structure of a magnet wherein a magnet consisting of a magnetic body including iron and rare earths, a plurality of fluorine compound layers or oxyfluorine compound layers are formed interior of the magnetic body, and the fluorine compound layer or oxyfluorine compound layer has a major axis which is greater than the mean particle size of the crystal grains of the magnetic body.

A wind-power unit has a wind turbine has an electric generator connected to the wind turbine. The stator of the generator has a winding formed of a high-voltage cable having a core of conducting material, a first layer of semiconducting material surrounding the core, an insulating layer of solid material surrounding the first layer, and a second layer of semiconducting material surrounding th solid insulation. The wind turbine has a plurality of turbine blades running vertically and being connected to a turbine shaft. The generator is arranged at the lower end of the turbine shaft. A wind-power plant; the use of a wind-power unit; and a method of generating electric power are described.

Disclosed is a semiconductor integrated circuit device including a transmitting circuit and a receiving coil inductively coupled to a transmitting coil. The transmitting circuit transmits data by supplying a current through the transmitting coil not at the time of transition of data but at every rising edge or falling edge of a clock used in transmission of data. At every rising edge or falling edge of the clock, a receiving circuit captures a voltage induced in the receiving coil due to the current flowing through the transmitting coil, reproduces the transmitted data and outputs the reproduced data.

A motor includes a stator having a winding, and a rotor. The rotor rotates by receiving a rotational magnetic field generated by drive current supplied to the winding. The winding includes a first winding and a second winding, the first and second windings both being excited at the same timing by the drive current. The first winding and the second winding are connected in series. The rotor includes a first pole section and a second pole section. The second pole section faces the second winding at the rotation position of the rotor at which the first pole section faces the first winding. The magnetic force exerted on the stator by the second pole section is weaker than that exerted by the first pole section.

A wheel suspension for a motor vehicle includes an electric vibration damper which is affixed to the vehicle body and which has a generator that can be driven by translational wheel movements of the vehicle wheel in order to generate an induced voltage. The stator and the rotor of the generator are interconnected via at least one gear stage, wherein a gear element of the gear stage is a drive gear wheel of a rack-and-pinion drive that is drivingly connected to a wheel carrier of the wheel suspension, with the wheel carrier following the wheel movements.

A switching power converter comprises a switch, a pulse width modulation (PWM) circuit, a rectifying filter circuit and a current limited protection circuit. The input terminal of the rectifying filter circuit is coupled to an input voltage via the switch. The current limited protection circuit comprises an amplifier and a pulse-width modulator. The amplifier detects an induced voltage while a working current flows through the switching power converter, and amplifies the induced voltage so as to generate a comparison voltage. The pulse-width modulator receives an output from the amplifier, determines an output of the pulse-width modulator according the comparison voltage and a reference voltage, and limits the working current according to the output of the pulse-width modulator.

The present invention provides a synchronous motor which comprises a stator including a stator iron core having a winding wound therearound and also having an inner cylindrical surface; a rotor including a rotor iron core in the form of a rotor laminate of a plurality of electromagnetic steel plates and rotatably accommodated while facing the inner cylindrical surface of the stator iron core, said rotor iron core including a magnet retaining portion provided with magnet retaining slots, a magnetic flux shortcircuit preventive portion coupled with the magnet retaining portion and provided with magnetic flux shortcircuit preventive holes communicated with the magnet retaining holes, and a rotor outer end portion coupled with the magnetic flux shortcircuit preventive portion and provided with holes communicated with the magnetic flux shortcircuit preventive holes; and permanent magnets embedded within the magnet retaining holes in the rotor and defining rotor magnetic poles. In this structure, the magnetic flux shortcircuit preventive holes are smaller than the magnet retaining holes such that by allowing the permanent magnets to be held in engagement with outer edges of the magnetic flux shortcircuit preventive holes, the permanent magnets are axially positioned.

The invention discloses a Rogowski coil and a current measuring device, and belongs to the field of current transformers. A Rogowski coil of the present invention comprises an upper layer of a coil, aloop layer and a lower layer of the coil, wherein the upper layer of a coil, the loop layer and the lower layer of the coil are provided with a plurality of conductive through-holes and metal platingmaterials. The plurality of conductive through-holes are evenly arranged and aligned in a radial direction to form a ring shape. The conductive through-holes of the annular inner ring of the upper layer of a coil are obliquely connected to the conductive through-holes of the annular outer ring by the metal plating materials. The metal plating materials of the loop layer are annularly formed and plated in the middle of the annular conductive through-holes. The conductive through-holes of the annular inner ring of the lower layer of the coil are radially connected to the conductive through-holes of the annular outer ring by the metal plating materials. The metal plating materials and the through-holes form a loop coil. According to the Rogowski coil and current measuring device, a multi-layer PCB is set on the Rogowski coil, the thickness of the Rogowski coil is increased, so that the mutual inductance coefficient of the Rogowski coil, which is the induced voltage of the output, is increased, the sensitivity coefficient of the coil is increased, which is advantageous for current measurement of a lower amplitude.

The invention provides a copper coil-based full-tensor magnetic field gradient measurement device. The copper coil-based full-tensor magnetic field gradient measurement device comprises a gradiometer main body, a supporting base and a signal connection interface, wherein the gradiometer main body is used for measuring full-tensor magnetic field and magnetic field gradient information of each point in a space, and the full-tensor magnetic field and magnetic field gradient information comprises a response gradient value corresponding to five independent components in a full-tensor matrix and three magnetic field vector values of a central point; the supporting base is used for horizontal regulation operation which is required to be carried out during measurement of the magnetic field gradient of the space; the signal connection interface is used for transmitting weak voltage signals corresponding to the magnetic field gradient and central magnetic field intensity. According to the copper coil-based full-tensor magnetic field gradient measurement device provided by the invention, the technical defect that a traditional magnetic field gradient measurement device just can be used for measuring gradient information in a single direction of a magnetic field is solved, and the space consistency and the information integrity of magnetic field component measurement are increased.

A control device for a driving apparatus. The control device is configured with a device that controls the rotary electric machine via the inverter, a device that determines whether a disconnect condition of the main power supply is satisfied, and a device that obtains an estimated field amount that is an estimated value of the field flux supplied from the rotor to the stator. The control device is also configured with a device calculates an induced voltage that is induced in the coil, and a device that determines whether an overvoltage state in which the induced voltage exceeds a voltage resistance of the inverter exists. If it is determined that an overvoltage state exists when the disconnect condition is satisfied, connection with a main power supply is maintained until the overvoltage state is eliminated. The rotary electric machine is controlled by weakening the field flux to the coil.

The present invention discloses a magnetic isolation drive circuit, comprising a first input end, a second input end, a first output end, a second output end, a switch tube Q10, a diode D10, a TVS diode, a transformer B, a primary winding, a secondary winding, and an acceleration switch-off circuit at the secondary side, wherein the acceleration switch-off circuit includes at least one switch tubeQ11, the positive electrode of the TVS diode is connected to the first input end, the negative electrode of the TVS diode is connected to the negative electrode of the diode D10, the positive electrode of the diode D10 is connected to a drain electrode of the switch tube Q10, and a source electrode of the switch tube Q10 is connected to the second input end, and two ends of the primary winding are respectively connected to the first input end and the second input end. In first few cycles of the circuit, when a primary side MOS transistor is turned off, a primary voltage of the transformer isclamped to a set value by the TVS, and the secondary side can generate a sufficiently large induced voltage and a reverse current to drive operation of the acceleration switch-off circuit, to achievea fast switch-off of a driven power switch component, so that the circuit is no longer out of control in the first few cycles.

The invention relates to a power generation device (1) that includes an excitation coil (2) with a central opening, and a magnetic circuit (3) extending through the central opening of the coil and including at least one permanent magnet (4a, 4b, 6) and a plurality of ferromagnetic members (33, 34, 32, 40) arranged in a fixed portion and two mobile portions (30a, 30b), characterized in that the two mobile portions (30a, 30b) are mounted on two parallel rotary axes and can each assume two positions, in that the device includes means for rotating (5, 50) the two mobile portions (30a, 30b) between the two positions thereof so as to create two states of the magnetic circuit (3), i.e. a first state in which a magnetic flow (F1) flows through the coil in one direction and a second state in whicha magnetic flow (F2) flows through the coil in the opposite direction.

The invention discloses an electromagnetic type vibration energy collector based on a Halbach array. The electromagnetic type vibration energy collector based on the Halbach array comprises a fixed fastening base I, a movable fastening base II, a cantilever beam I, a cantilever beam II, the Halbach array, a square frame and an electromagnetic transducer, wherein the fastening base I and the fastening base II are correspondingly arranged; one end of the cantilever beam I is arranged on the fastening base I, and the other end of the cantilever beam I is provided with the square frame; the Halbach array is arranged in the square frame; one end of the cantilever beam II is arranged on the fastening base II, and the other end of the cantilever beam II is provided with the electromagnetic transducer; the electromagnetic transducer is located in a magnetic field of the Halbach array. The electromagnetic type vibration energy collector has the advantages of being simple in structure, sensitive in induction, small in overall size, high in induced voltage and output power and the like.

The invention discloses a magnetic-field-point-free magnetic nanoparticle imaging method based on a hysteresis effect. The method comprises the following steps: obtaining a hysteresis loop model of a superparamagnetic nanoparticle (Superparamagnetic Iron Oxide Nanoparticles, SPIO); carrying out calculating based on a sine excitation magnetic field and the hysteresis loop model of the SPIO, so as to obtain a point spread function (PSF) of the SPIO; acquiring an original reconstructed image of field free point-magnet particle imaging (FFP-MPI) based on a field free point (FFP) moving track and a voltage signal; and carrying out deconvolution on the PSF considering the hysteresis effect of the original image, thereby obtaining a final reconstructed image. According to the method, artifacts and phase errors generated by the hysteresis effect of the large-particle-size SPIO on image reconstruction are reduced, the defect of the traditional reconstruction method that reconstruction is carried out by ignoring the hysteresis effect is overcome, the reconstruction speed and resolution are greatly improved, and the application range of the SPIO is widened.