121results about How to "Current loss" patented technology

A shielded planar capacitor structure (202) is discussed, formed within a Faraday cage (210) in an integrated circuit device (200). The capacitor structure (202) reduces parasitic capacitances within the integrated circuit device (200). The capacitor (202) comprises a capacitor stack (102) formed between a first and second metal layers (230,232) of the integrated circuit. The capacitor stack (102) has a first conductive layer formed from a third metal layer (106) disposed between the first and second metal layers (230,232) of the integrated circuit, a dielectric isolation layer (110) disposed upon the first conductive layer (106); and a second conductive layer (112) disposed upon the dielectric isolation layer (110) and overlying the first conductive layer (106). The structure (202) further has a first and second isolation layers (104,114) disposed upon opposite sides of the capacitor stack (102). The Faraday cage (210) is formed between the first and second metal layers (230,232) of the integrated circuit (200), comprising a first and second shield layers (402,414) each having a plurality of mutually electrically conductive spaced apart traces (404). The first and second isolation layers (404,414) and the capacitor stack (102,434) are sandwiched between the first and second shield layers (402,414). Conductive elements (432) are distributed around the periphery of the capacitor stack (102,434) and the first and second isolation layers (404,412). The conductive traces (424) of the first shield layer (402) are connected to the conductive traces (424) of the second shield layer (414) through the conductive elements (432).

Servo controlled solenoids provide actuation of a pump piston and valves, and electronic LC resonance measurements to determine liquid volume and gas bubble volume. Third order nonlinear servo control is split into nested control loops: a fast nonlinear first-order inner loop causing flux to track a target by varying a voltage output, and a slower almost linear second-order outer loop causing magnetic gap to track a target by controlling the flux target or the inner loop. The inner loop uses efficient switching regulation, preferably based on controlled feedback instabilities, to control voltage output. The outer loop achieves damping and accurate convergence using proportional, time-integral, and time-derivative gain terms. The time-integral feedback may be based on measured and target solenoid drive currents, adjusting the magnetic gap for force balance at the target current.

A tapped inductor buck converter which achieves zero voltage switching and continuous input and output terminal currents is revealed. To achieve these results an additional switch, a small inductor, and a capacitor are required. The small inductor serves as a source of energy for driving the critical turn on transition of the main switch and the same small inductor also serves as a filter component for smoothing the input and output terminal currents. Simple adaptive gate drive circuits are revealed that improve the timing for turn on of zero voltage switches and reduce gate drive losses. A synchronous rectifier self drive mechanism is revealed which is universally applicable to zero voltage switching power converters with a single main switch which rely on an auxiliary inductor to drive the critical turn on transition of the single main switch. The wave form generated by the auxiliary inductor is ideally suited to synchronous rectifier self drive. Finally, peak current sensing techniques are revealed which are universally applicable to zero voltage switching power converters with a single main switch and an auxiliary switch which rely on an auxiliary inductor to drive the critical turn on transition of the single main switch. The current sensing techniques sense a winding voltage of the auxiliary inductor during the on time of the auxiliary switch. The winding voltage is directly related to the peak current in the main winding of the auxiliary inductor and the peak current in the single main switch of the power converter. The novel current sensing techniques are low noise, reliable, and lossless.

A non-volatile memory having a substrate, a select gate, a pair of charge storage layers, a pair of source/drain regions and a control gate is provided. At least a pair of trenches are formed in the substrate. The select gate is formed on the substrate between the pair of trenches. A pair of charge storage layers is formed on the sidewalls of the trenches next to the select gate. A pair of source/drain regions is formed in the substrate at the bottom of the trenches. The control gate is formed on the substrate to fill the trenches completely.

A high speed brushless axial gap air core electrical machine includes a rotor mounted for rotation about an axis, and a stationary stator that magnetically interacts with the rotor. The rotor has two discs that are axially spaced apart to form an armature airgap. A stationary air core armature, with windings made of multiple individually insulated strand conductor wire for providing energy conversion, is located in the armature airgap. At least one of the discs carries a circumferential array of multiple alternating axial polarity permanent magnet poles facing the armature airgap. The magnets drive magnetic flux circumferentially through ferromagnetic portions of the discs and axially through the armature airgap. The discs have an integral axially extending circumferentially continuous lip outside of the array of magnet poles. The lip has a integral shear connection with the disc that substantially reduces the hoop stress in the lip that would otherwise occur from the radial containment of the magnet poles when rotated to high speed.

A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is generated. The first pair of switching devices are controlled based on the reference voltage signal and the switching signal in accordance with the pulse width modulation technique. A frequency of the switching signal is varied based on the value of the reference voltage signal.

Method for varying the power consumption of capacitive loads, in particular compact fluorescent lamps which are operated using a phase-gating dimmer by a converter (step-up converter). According to the invention, in the case of a nonconducting dimmer (i.e. no system power supply to the load), the switch (T1) in the converter (step-up converter) is closed. In the case of a conducting dimmer (i.e. when a system voltage is applied to the load), the step-up converter operation takes place until a predetermined maximum voltage is reached across the smoothing capacitor of the load.

In a permanent magnet rotor, a power transmitting shaft is connected to an axial end of a solid cylindrical permanent magnet, and a reinforcement sleeve is fitted on the outer circumferential surface of the permanent magnet. Thus, the shaft is not required to be passed through the permanent magnet as was the case with the conventional permanent magnet rotor for the purpose of transmitting the rotational torque and increasing the overall rigidity, and the increase in the axial dimension of the rotor due to the reduction in the cross sectional area of the permanent magnet can be avoided. Also, because the sleeve surrounds the permanent magnet, the resistance to centrifugal stress resulting from a high speed rotation and repeated bending stress owing to vibrations can be improved.

A fuel cell includes an electrolyte electrode assembly and a pair of separators sandwiching the electrolyte electrode assembly. Each of the separators is a single plate, and includes a plurality of circular disks. First protrusions and second protrusions are provided on both surfaces of the circular disk. The first protrusions contact the anode of the electrolyte electrode assembly to form a fuel gas flow field, and the second protrusions contact the cathode of the electrolyte electrode assembly to form an oxygen-containing gas flow field. The shape of the first protrusion is different from the shape of the second protrusion. The first and second protrusions are coaxial with each other.

A steering drive for a motor vehicle comprising a steering wheel, a steering column, on which the steering wheel is disposed, a connecting rod, which interacts with the steering column to deflect the wheels of the motor vehicle, an electric motor, which is provided for boosting the steering thrust, as well as a belt drive, the electric motor interacting with the connecting rod via the belt drive. Said electric motor comprises a stator having twelve stator teeth as well as a rotor having ten rotor poles, the rotor poles being spaced apart from each other by an air gap and embodied as sinus poles.

The present invention discloses a composite soft magnetic powder core and a preparation method therefor, which belong to the technical fields of soft magnetic materials and preparation thereof. An Fe/Fe₃O₄ shell layer is generated in situ on surfaces of iron powder particles through a controlled oxidation process, to prepare Fe/Fe₃O₄ composite soft magnetic powder having a uniform structure. The Fe/Fe₃O₄ composite soft magnetic powder is mixed with suitable amount of silicone resin, and prepared into a high-performance Fe/Fe₃O₄ composite soft magnetic powder core by using a powder metallurgy compaction process. Such magnetic powder core has a high density, a high magnetic conductivity, a high magnetic flux density, a low loss, and a high breaking strength, and is useful in a large-power and low-loss application scenario. The present invention has the advantages of being rich in raw material resources, simple in process and environmentally friendly, and being suitable for industrial production.

A control apparatus for a rotary electric machine, which has a rotary element that includes a permanent magnet, includes a magnet temperature acquisition portion, a coolant temperature detection portion and a temperature control portion. The magnet temperature acquisition portion acquires information about temperature of the permanent magnet. The coolant temperature detection portion detects temperature of a coolant that cools at least the rotary element. The temperature control portion performs a temperature raising control of the permanent magnet when the temperature of the permanent magnet is less than or equal to a first threshold temperature and the temperature of the coolant is less than or equal to a second threshold temperature.

A reluctance motor in which at least one snap ring engages the ends of the exciter coils remote from the stator yoke with radially outward acting spring force.

The invention relates to a ring coil motor (1, 20) with a primary part (3, 21) and a secondary part (2, 22), wherein the primary part (3, 21) has a ring coil (6, 25) and permanent magnets (9, 27).

A device for detecting the condition of flow in a respiration system combines the function of a nonreturn valve with the function of flow measurement in a common device. The device includes a valve arrangement (1) with a valve disk (9) and with a valve body (8), wherein the position of a valve disk (9) in relation to a valve seat (11) is detected. An indicator for a flow and a direction of flow (5), (6) is determined from the position of the valve disk (9). The position of the valve disk (9) can be determined inductively, electrically, electromechanically or optically. The flow and direction of flow (5), (6) determined can be used to control the respiration in a medical device.

A linear motor in which the shape of magnetic pole surfaces of pole teeth located at both ends of a plurality of pole teeth can be easily formed to be suitable for reducing cogging force. Each of magnetic pole surfaces 19a of pole teeth 15A located at both ends of a plurality of pole teeth 15 is constituted by an arc-shaped curved surface that is curved so that gap from a stator 1 increases with increasing distance from other adjacent pole tooth 15B. Through holes 23A and 23B that extend in the laminating direction of electromagnetic steel plates 10 are formed in the vicinity of the magnetic pole surfaces 19a of the pole teeth 15A. Inside the through holes 23A and 23B, magnetic pieces, which are shorter than the thickness of the electromagnetic steel plates in their laminating direction, are arranged so as to leave spaces at both ends of the through holes 23A and 23B.