315 results about "Choke" patented technology

A petroleum well has an electronic module and a number of sensors which communicate with the surface using the tubing string and casing as conductors. Induction chokes at the surface and downhole electrically impede AC flow through the (tubing or casing if so configured) with the resulting voltage potential useful for power and communication. A high bandwidth, adaptable spread spectrum communications system is used to communicate between the downhole electronics module and a surface master spread spectrum modem. Downhole sensors, such as pressure, temperature, acoustic and seismic sensors accurately assess downhole physical conditions. In a preferred form, the electronics module and sensors are wireline insertable and retrievable into a side pocket mandrel in the tubing string. Permanent downhole sensors that can communicate with the surface allow such diverse applications as optimizing well and field performances, monitoring and assessing the geophysics of the fomrations around the well, assessing well and reservoir reserves, assessing reservoir conditions.

A lead for an electronic device which resists the induction of a current from an electromagnetic field external to said lead includes one or more pairs of adjacent segments of electrical wire, each of the pairs including a first segment of electrical wire and a second segment of electrical wire. The lead also includes one or more shielded RF chokes, wherein each of the shielded RF chokes is provided between the first segment of electrical wire and the second segment of electrical wire of a respective one of the one or more pairs of adjacent segments. Also, an implantable device that includes a generator for generating one or more electrical pulse and a lead as described for delivering the pulses to tissue within a patient's body. A method for making the described implantable device is also provided.

Various high-strength microwave antenna assemblies are described herein. The microwave antenna has a radiating portion connected by a feedline to a power generating source, e.g., a generator. The antenna is a dipole antenna with the distal end of the radiating portion being tapered and terminating at a tip to allow for direct insertion into tissue. Antenna rigidity comes from placing distal and proximal radiating portions in a pre-stressed state, assembling them via threaded or overlapping joints, or fixedly attaching an inner conductor to the distal portion. The inner conductor is affixed to the distal portion by, e.g., welding, brazing, soldering, or by adhesives. A junction member made from a hard dielectric material, e.g., ceramic, can be placed between the two portions and can have uniform or non-uniform shapes to accommodate varying antenna designs. Electrical chokes may also be used to contain returning currents to the distal end of the antenna.

Two power modules, in which switching elements for switching over currents supplied to coils of a motor are resin-molded, are provided to face each other sandwiching a plane including a rotation axis of a shaft. A first smoothing capacitor, second smoothing capacitors and a choke coil are located between the power modules. By consolidating large-sized electronic parts between the power modules, a control unit can be reduced in size and impedance of electric conductor connecting the electronic parts and the power modules can be reduced.

An advanced modular plug connector assembly incorporating an insert assembly disposed in the rear portion of the connector housing. In one embodiment, the connector has a plurality of ports in multi-row configuration, and the insert assembly includes a substrate adapted to receive one or more electronic components such as choke coils, transformers, or other signal conditioning elements or magnetics. The substrate also interfaces with the conductors of two modular ports of the connector, and is removable from the housing such that an insert assembly of a different electronics or terminal configuration can be substituted therefor. In this fashion, the connector can be configured to a plurality of different standards (e.g., Gigabit Ethernet and 10/100). In yet another embodiment, the connector assembly comprises a plurality of light sources (e.g., LEDs) received within the housing. Methods for manufacturing the aforementioned embodiments are also disclosed.

A switch mode power converter provides high efficiency at light and no load conditions by utilizing a variable inductance swinging choke at the output of a synchronous rectifier. The use of the swinging choke with a synchronous rectifier eliminates power inefficiencies caused by currents that circulate from the output capacitance to the input capacitance during no load conditions.

The present invention relates to a choke with two coils and a core for interleaved applications in step-up or step-down circuits or power factor compensation circuits. The core comprises several core sections with several lateral legs and a middle leg, whereby the core is designed such, that a coupling factor k of the two coils is smaller than 3%-5%. Furthermore, the core is designed such, that the core section form two loops with the middle leg as a common section, whereby each of the two coils lies on different loops outside of the common section. The lateral legs have a cross section A1 and the middle leg for the common section has a cross section A2<2×A1.

In a winding-type common mode choke coil serving as an example of a coil part, troubles such as mode conversion characteristics becoming larger due to the effects of stray capacitance are eliminated. A 0.5 shift region A which shifts 0.5 turns between a first wire (43) of a first layer and a second wire (44) of a second layer, and a 1.5 shift region B which shifts 1.5 turns in the opposite direction are distributed on a winding coil section (45) along the axial direction. In the 0.5 shift region A, a diagonal capacity which is quantified as -1 or +1 is generated for each one turn, and in the 1.5 shift region B, a diagonal capacity which is quantified as +3 or -3 is generated for each one turn. Here, the sum of the number of turns of the second wire (44) positioned in the 0.5 shift region A is set to be at least two times and at most five times the sum of the number of turns of the second wire positioned in the 1.5 shift region B, thereby balancing the diagonal capacity over the entirety of the first and second wires to reduce the effects of stray capacitance.

A common mode choke coil includes a primary coil and a secondary coil, wherein the primary coil includes a first coil pattern and a second coil pattern connected in series to the first coil pattern, and the secondary coil includes a third coil pattern and a fourth coil pattern connected in series to the third coil pattern. The first and third coil patterns are concentrically wound, as parallel or substantially parallel lines, in loop shapes on one surface, and the second and fourth coil patterns are concentrically wound, as parallel or substantially parallel lines, in loop shapes on the one surface with being adjacent to the first and third coil patterns.

The invention is comprised of a coil group arranging a plurality of terminal-integrated type coils ( 1 ), ( 4 ) formed by bending a metal sheet in a preset development form and having a predetermined positional relationship, and a magnetic material ( 7 ) burying therein the coil group. For example, axes of the plurality of coils ( 1 ), ( 4 ) constituting the coil group, are arranged in parallel wherein the center point of at least one coil selected from the plurality of coils ( 1 ), ( 4 ) and the center point of a coil other than the selected coil are in an staggered arrangement. Due to this, an array type choke coil can be realized which is thin overall and operable with a large current in a high frequency band.

A method of controlling a direct current (“DC”) chopper controller having a switch and a storage choke in which the choke has a current dependent on the switching of the switch on and off includes the following. A current variable derived from one of the time averaged value of the current of the choke and the peak value of the current of the choke is determined. A switching frequency for synchronizing the turning on and off the switch is calculated as a function of the current variable and on whether the current variable exceeds a current threshold. The switching frequency is determined to be a predetermined low frequency if the switching frequency is lower than the low frequency and is determined to be a predetermined high frequency if the switching frequency is greater than the high frequency. The switch is switched on and off in accordance with the switching frequency.

The invention belongs to the technical field of monitoring of high-speed rail electrical systems and discloses a method and a device for monitoring geomagnetically induced current of high-speed rails. A high-speed rail geomagnetic storm damage monitoring and recording device comprises a traction main transformer and an earth box with a traction backflow collection function, a three-phase power source is connected into a traction substation, a traction backflow wire running through an earth wire, a PW protection wire and a choke transformer midpoint lead connected with two rail bars are arranged in the earth box which is an independent box structure , and the earth box is connected with an earth electrode of the traction transformer. Since interference exists in GIC (geomagnetically induced current) sampling signals, local high-frequency noise interference can be effectively eliminated by adopting a wavelet analysis method for variable-size localization analysis of time domain and frequency domain windows. The device comprises a signal acquisition sensor, a synchronous signal acquisition card and an industrial control computer. The device with a threshold alarming function is capable of sending alarm signals when monitoring quantity exceeds a threshold, so that influences of geomagnetic storm on a railway system can be known timely and conveniently. By monitoring for a period of time, direct-current magnetic bias current of the traction transformer is recorded to provide data for analysis on safety operation of a high-speed rail tractive power supply system.

The present invention relates to a rectifier circuit with a three-phase rectifier arrangement (1) of semiconductor valves (2), preferably a bridge rectifier circuit of diodes, wherein the rectifier arrangement (1) comprises a three-phase mains input (3) and a DC output (4), and at least one of the three phases (U, V, W) at the mains input (3) is connected to a first pole connection (A) of a three-pole circuit (5) for diverting an injection current (i_h3) into the three-pole circuit (5). It is provided in accordance with the invention that each phase (U, V, W) can respectively be connected with a switching element (S₁, S₂, S₃) to the first pole connection (A) of the three-pole circuit (5), and a second and third pole connection (B, C) of the three-pole circuit (5) is respectively connected to an output line (P_DC,N_DC) of the DC output (4) for control currents (i_cp,i_cn), wherein the three-pole circuit (5) comprises controllable semiconductor valves (S_cp+,S_cp−,S_cn+,S_cn−), preferably IGBTs, for the active control of the control currents (i_cp,i_cn) and/or the injection current (i_h3), and at least one choke (7) is arranged on one of the output lines (P_DC,N_DC) at the DC output (4), and a time-variable load (6) is provided at the DC output (4).

The invention discloses a packaging structure of an integrated common mode choke and a packaging method of the integrated common mode choke, and belongs to the technical field of semiconductor packaging. The packaging structure of the integrated common mode choke comprises an upper-layer inductance coil (110) and a lower-layer inductance coil (120), wherein the upper-layer inductance coil (110) and the lower-layer inductance coil (120) are vertically distributed, are consistent in winding direction, are the same in number of turns, wire width and wire distance, and are not overlapped in the perpendicular direction, upper-layer metal columns (210) which are perpendicularly and upwards connected with the upper-layer inductance coil (110) are arranged on an inner port and an outer port of the upper-layer inductance coil (110) respectively, lower-layer metal columns (220) which are perpendicularly connected with the lower-layer inductance coil (120) are arranged on an inner port and an outer port of the lower-layer inductance coil (120) respectively, the perpendicular direction of the lower-layer metal columns (220) and the perpendicular direction of the upper-layer metal columns (210) are the same or opposite, and the lower-layer inductance coil (120) is manufactured through metal carriers and a wet etching technology. The packaging structure of the integrated common mode choke is small in size, flat and consistent in performance parameter, the loss of the integrated common mode choke can be reduced under the condition of the high frequency, performance of an EMI filter is improved, and the packaging structure is applicable to large-scale production.

A conducted EMI noise suppression method of a complex electronic system comprises: 1) analyzing the reasons generating the conducted EMI noise: (1) crosstalk, (2) bad grounding, and (3) PCB (printed circuit board) impedance mismatch; and 2) tightly winding the live wire and the neutral wire of a crosstalk choking coil in a negative-incoming negative-outgoing manner if the conducted EMI noise is caused by crosstalk; connecting capacitors (C1 to C8) in parallel, and respectively disposing U1 and U2 between C1 and C2, and between C4 and C5 if the conducted EMI noise is caused by bad grounding, wherein U1 is equal to U2, and the capacitances of C1, C2, C3, C4, C5, C6, C7 and C8 are respectively 22muF, 22muF, 0.1muF, 0.1muF, 0.1muF, 0.1muF, 100muF, and 10pF; and calculating the characteristic impedance of the PCB circuit by using electromagnetic simulation software, and carrying out signal integrity analysis according to the frequency characteristics of the transmission signal to realize the optimum impedance match of the PCB circuit if the conducted EMI noise is caused by PCB impedance mismatch.

The invention relates to a radio frequency front-end comprehensive electromagnetic protection circuit, which comprises an input matching circuit, a capacity expansion protection circuit, a switch protection circuit, an amplitude limiting protection circuit, first to fourth inter-stage matching circuits, an output matching circuit and a coupling detection circuit; the first end of the input matching circuit serves as an input end, and the second end of the input matching circuit is connected with the first end of the capacity expansion protection circuit. The capacity expansion protection circuit at least comprises two capacity expansion branches; the switch protection circuit comprises more than one conduction unit. The amplitude limiting protection circuit comprises more than one amplitude limiting unit; the coupling detection circuit comprises a directional coupler, a detection diode, a third inductor and a choke inductor. The circuit has a continuous wave and transient strong electromagnetic pulse comprehensive protection capability, and the power capacity and the through-current capability of a large signal at the radio frequency front end under a strong field continuous wave and a strong electromagnetic pulse are improved.

The invention discloses a biasing circuit for a radio frequency power amplifier, wherein the biasing circuit comprises an input and amplification module which is used for receiving an input radio frequency signal, amplifying the radio frequency signal and then providing the amplified radio frequency signal to an output end, and comprises a radio frequency power tube QRF for amplifying a radio frequency signal; a first rectification path module, which is used for compensating for gain compression in medium power; a second rectification path module which is used for compensating for gain compression in high power, wherein the first rectification path module comprises a transistor Q3, and the second rectification path module comprises a transistor Q1 shared by the first rectification path module; a voltage stabilization and current regulation module, which is used for keeping the conducting state of the transistor Q1 and adjusting the proportion of current distributed to the transistor Q1 and the transistor Q3; a radio frequency choke module which is used for blocking leakage of radio frequency signals; and a temperature compensation module that is used for inhibiting the increase of the collector current of the transistor Q1 caused by temperature rise.