165results about How to "Small inductance" patented technology

A multilayer feedthrough capacitor having a first internal conductor arranged in a dielectric body, an intermediate internal conductor arranged in the dielectric body and stacked with the first internal conductor via a ceramic layer, a second internal conductor arranged in the dielectric body and stacked with the intermediate internal conductor via a ceramic layer, a first terminal electrode formed at an outside surface of the dielectric body and connected to the first internal conductor, a second terminal electrode formed at the outside surface of the dielectric body and connected to the second internal conductor, and an intermediate terminal electrode formed at the outside surface of the dielectric body and connected to the intermediate internal conductor. The intermediate terminal electrode is connected to the ground, while the first terminal electrode and the second terminal electrode are connected to paths for transmitting signals. The first internal conductor and the second internal conductor have currents flowing through them in opposite directions.

An inductor element having good characteristics is formed on a substrate. An inductor element 100 includes two spiral conductors 120, 122 formed on the surface of a semiconductor substrate 110. The upper conductor 120 and the lower conductor 122 have substantially the same shape, and the conductor 120 is used as an inductor conductor, while the conductor 122 is used as a floating conductor. The outer and inner ends of the conductor 120 are connected with lead wires 130, 132, respectively, and the lead wire 132 connected with the inner ene extends outside between the lower conductor 122 and the semiconductor substrate 110.

The invention relates to a LCL (Lower Control Unit) filtering controlled rectifying active damping control method of electric currents on a feedback variable current side, belonging to an active rectifying method of power electronics. The method comprises the following steps: a direct current voltage control unit is used for finishing the control on a direct current voltage and producing d-shaft active currents of an electric current control unit; a q-shaft current given is used for controlling reactive components of a rectifier; a soft phase locking unit is used for locking a power grid voltage phase position and realizing the synchronous rotational transformation of the power-grid voltage and sampling currents on the variable current side; the current given and a sampling actual value are fed into the electric current control unit; the output quantity of the electric current control unit is accumulated with the electric current on the variable current side which is fed back by usinga first-order high-pass filter to generate the given quantity of a voltage space vector unit; and finally, the voltage space vector unit generates six PWM (Pulse-Width Modulation) signals to finish the control on the rectifier. The method solves the stability problem of a LCL (Low Control Unit) filtering voltage type controlled rectifier and realizes the control of the rectifier on direct-currentvoltages and currents on line side under the condition that the electric current or voltage detection of a capacitor branch is not needed.

A device for generating radiation source based on a discharge includes a cathode and an anode. The cathode and anode material are supplied in fluid state. The material forms a plasma pinch when the device is in use. Optionally, nozzles may be used to supply the material. The cathode and / or anode may form a flat surface. The trajectories of the material may be elongated. A laser may be used to cause the discharge more easily. The laser may be directed on the anode of cathode or on a separate material located in between the anode and cathode.

The invention belongs to the technical field of automobile energy-saving equipment, and relates to a regenerative braking energy storage device for an electric automobile. An ultracapacitor module stores the regenerative braking feedback energy of the electric automobile and is connected in parallel with a storage battery to power an electric motor when the electric automobile starts and accelerates; an ultracapacitor charge-discharge controller is electrically connected with the ultracapacitor module, the storage battery and the driving controller respectively; the ultracapacitor charge-discharge controller is electrically communicated with the ultracapacitor module to control the charge-discharge process; and the driving controller is electrically communicated with the electric motor to achieve control operation of the electric motor. According to the invention, ultracapacitors store the regenerative braking feedback energy of the electric motor car to prevent adverse effects on the power supply of the electric automobile due to frequent charge and discharge, so as to achieve a long service life, and the ultracapacitors have high power density and good dynamic response.

The invention provides an input-series-output-parallel (ISOP) system having natural voltage sharing characteristic and a control method thereof. The system comprises n sub-modules, wherein each sub-module comprises a Boost converter and an LLC resonant converter, n is a natural number larger than or equal to 2, in each sub-module, the Boost converter is a front stage, the LLC resonant converter isa rear stage, an output of the Boost converter is used as an input of the LLC resonant converter, the two converters are connected by an intermediate bus capacitor, input ends of the Boost convertersof the n sub-modules are sequentially connected in series, a positive electrode of an input voltage source is connected with an input positive end of a first Boost converter, a negative electrode ofthe input voltage source is connected with an input negative end of an n(th) Boost converter, and output ends of the LLC resonant converters of the n sub-modules are connected in parallel and are respectively connected with a positive end and a negative end of an output resistor. By the system, no extra measure is needed to be added, input voltage sharing and output current sharing of the ISOP system can be achieved, and the influence of inconsistent parameter among the modules on a voltage sharing and current sharing effect is relatively small. The implement method is simple, and the reliability of the system can be greatly improved.

A multilayer feedthrough capacitor having a first internal conductor arranged in a dielectric body, an intermediate internal conductor arranged in the dielectric body and stacked with the first internal conductor via a ceramic layer, a second internal conductor arranged in the dielectric body and stacked with the intermediate internal conductor via a ceramic layer, a first terminal electrode formed at an outside surface of the dielectric body and connected to the first internal conductor, a second terminal electrode formed at the outside surface of the dielectric body and connected to the second internal conductor, and an intermediate terminal electrode formed at the outside surface of the dielectric body and connected to the intermediate internal conductor. The intermediate terminal electrode is connected to the ground, while the first terminal electrode and the second terminal electrode are connected to paths for transmitting signals. The first internal conductor and the second internal conductor have currents flowing through them in opposite directions.

The invention discloses a three-fracture double-acting type high-speed permanent magnet repulsion switch and a method of the three-fracture double-acting type high-speed permanent magnet repulsion switch and belongs to the field of direct-current switches. The three-fracture double-acting type high-speed permanent magnet repulsion switch comprises a switch body, high-speed electromagnetic repulsion mechanisms, permanent magnetic operating mechanisms, contact springs, insulation pull rods, opening driving circuits, closing driving circuits, a detecting unit and a control unit. Each moving contact is connected to one end of one insulation pull rod through one contact spring, the other end of each insulation pull rod is connected with a driving rod, and each driving rod penetrates through a metal disc in one high-speed electromagnetic repulsion mechanism and is connected with a moving iron core; the control unit is respectively connected with a detecting circuit, the opening driving circuits and the closing driving circuits; each opening driving circuit is connected with an opening coil and each closing driving circuit is connected with a closing coil. According to the three-fracture double-acting type high-speed permanent magnet repulsion switch, a fracture with a large opening distance is formed at a short time and the opening speed of the switch is increased; meanwhile, according to the switch, the two moving contacts and two fixed contacts are in contact in sequence, so that when opening operation is conducted, the problems of movement dispersibility generated when multiple switches are independently driven and the like are solved.

A fast transient response converter is disclosed which makes use of stepping inductor in a switching converter to speed up output voltage response under fast transient condition. The inductive element in a switching converter is replaced by two series or parallel inductive elements, one of which has a smaller value of inductance than the other. During the fast transient period, the inductor with larger inductance value will be shorted to a voltage source. The total inductance will be greatly reduced and thus allows rapid current change during the transient change.

A common mode filter includes, between ports, a differential transmission line including a first signal line and a second signal line. The first signal line includes a first inductor arranged in series, and the second signal line includes a second inductor arranged in series. In addition, a first resonant circuit is provided between the first end of the first inductor and the ground, and a second resonant circuit is provided between the first end of the second inductor and the ground.

An inductor element 10 effectively functions even when formed on a substrate and comprises two upper and lower conductors 1, 2 spirally formed on the front side of a semiconductor substrate 3. The conductors 1, 2 have substantially the same shape. When viewed from the above of the front side of the substrate 3, the two conductors 1, 2 are superposed one on the other almost exactly. Lead wires 6a, 6b are connected to the outer end (outer peripheral end) and the inner end (center end) of the conductor 1, respectively. The outer end of the conductor 1 is connected to the inner end of the conductor 2 through a connection wire 6c. The conductor 1 functions as an inductor conductor and is connected to a circuit provided on the semiconductor substrate 3 through the lead wires 6a, 6b.

The invention provides a piezoelectric acoustic wave filter, which realizes high performance and high consistency of a piezoelectric acoustic wave filter device under a micro-assembly condition. The piezoelectric acoustic wave filter comprises a carrier plate, an upper wafer and a lower wafer, wherein the upper wafer and the lower wafer are located on the carrier plate and sequentially arranged from top to bottom, wherein the upper wafer and the lower wafer are respectively provided with a plurality of via holes, or only the lower wafer is provided with a plurality of via holes; alternatively,the piezoelectric acoustic wave filter comprises a carrier plate and a first wafer, a second wafer and a third wafer which are located on the carrier plate and arranged from top to bottom, and a plurality of via holes are formed in the second wafer and the third wafer respectively.

On a first-signal-line side, a first resonant circuit is defined by a first inductance element, a first capacitance element, a second capacitance element, a third inductance element and a fifth inductance element, a third resonant circuit is defined by the first inductance element, the first capacitance element and the second capacitance element, and a fifth resonant circuit is defined by the first inductance element, the third inductance element, the first capacitance element, the second capacitance element and the fifth capacitance element. Similarly, on a second-signal-line side, a second resonant circuit, a fourth resonant circuit and a sixth resonant circuit are provided.

The invention discloses a manufacturing method of a nanocrystalline common-mode inductor, and relates to the technical field of inductors. The method comprises the steps that a nanocrystalline strip is wound into a nanocrystalline magnetic ring with the outer diameter of 38 mm, the inner diameter of 22 mm and the height of 13 mm; the nanocrystalline magnetic ring is put into a vacuum annealing furnace to be subjected to heat treatment; the nanocrystalline magnetic ring obtained after heat treatment is cured and aged with epoxy resin; the cured and aged nanocrystalline magnetic ring is contained in a protection box; coils of two windings are evenly made on the two sides of the protection box of the nanocrystalline magnetic ring through two varnished wires, and then manufacture of the nanocrystalline common-mode inductor is completed. By means of the specially-set heat treatment method, the nanocrystalline common-mode inductor with the inductance larger than 15 mH, the outer size smaller than 48 mm and the thickness smaller than 28 mm can be manufactured, and the purposes of being high in inductance value and small in size are achieved.

Provided is a printed wiring board including: a plurality of inner layers including a ground layer and a power supply layer; and a plurality of ground vias and a plurality of power supply vias each provided to penetrate at least the ground layer and the power supply layer in a thickness direction of the printed wiring board, a ground potential being applied to the plurality of ground vias at the ground layer, and a power supply potential being applied to the plurality of power supply vias at the power supply layer. In a top view from a direction perpendicular to the printed wiring board, a distance between vias to which the same potential is applied is shorter than a distance between vias to which different potentials are applied.

An antenna device includes a conductive member and a wiring substrate including a coupling line that is conductive. The antenna device includes connecting conductors electrically connecting the conductive member and the coupling line. A feeding coil magnetic-field coupled to the coupling line is arranged on the wiring substrate.

The invention discloses a voltage online monitoring device for a power system. A high-voltage capacitive voltage divider is connected with a bus-bar and operated in the grid to divide the voltage of the bus-bar for the first time, a low voltage arm signal is transmitted to a secondary resistance-capacitance divider through a first coaxial cable, the secondary resistance-capacitance divider carries out secondary voltage division on the low voltage arm signal, the voltage signal at the low voltage side is transmitted to a high-speed data acquisition card to be subjected to A / D conversion through a second coaxial cable, and then the obtained digital signal is transmitted to an industrial personal computer to be judged, stored and analyzed; the high-voltage capacitive voltage divider, the secondary resistance-capacitance divider, the high-speed data acquisition card and the industrial personal computer are respectively grounded. The voltage online monitoring device for the power system can reach the sampling rate per channel of 7.5 MS / s, can run in the grid for long time, is low in power consumption and convenient to maintain, can track and record various over-voltage and voltage dip waveforms in an online manner, has various analysis and waveform processing functions, and provides scientific basis for the safe and reliable running of the power system.

The invention firstly aims to provide a cascading inductor based on metal magnetic slurry. The cascading inductor comprises a first base body, an interlayer and a second base body, wherein the first base body, the interlayer and the second base body are arranged from bottom to top. The interlayer comprises at least two single-layers arranged from bottom to top. Each single-layer comprises a dielectric layer, a packing layer and a coil electrode, wherein the dielectric layer is provided with a through hole in the vertical direction; the packing layer is arranged at the through hole, and the upper surface of the packing layer is not lower than the upper surface of the dielectric layer; the coil electrode is arranged on the upper surface of the dielectric layer and located around the packing layer; the packing layer comprises inorganic powder bodies composed of metal magnetic powder, lead-free glass powder, organic carriers and auxiliaries. The cascading inductor based on the metal magnetic slurry is simple in overall structure; since the packing layers are made of metal alloy materials with high saturation flux density, the saturation magnetization intensity of the whole cascading inductor is improved, and then the rated current is increased. The invention secondly aims to provide a preparation method of the cascading inductor based on the metal magnetic slurry. By means of the preparation method, the process steps are simple, the cost is low, and the cascading inductor is quite suitable for large-scale batch production.

The invention relates to a detecting structure and method for detecting a turn-to-turn insulation fault of an electric reactor through an oscillation method. The structure comprises a discharging ball gap and a pulse capacitor respectively connected to one end of the electric reactor, wherein the other end of the discharging ball gap is connected to the negative electrode of a power supply, the positive electrode of the power supply is connected to the other end of the reactor, and the other end of the pulse capacitor is connected to the negative electrode of the power supply. Since a discharging ball gap and a pulse capacitor are respectively connected to one end of the electric reactor, the power supply provides electric energy, and the pulse capacitor is charged through the power supply. When the pulse capacitor is charged to a certain value, the discharging ball gap discharges, and the pulse capacitor and the reactor form a damped oscillation circuit of a certain frequency. When turn-to-turn short circuit fault occurs to the reactor, the inductance value is reduced, and the active loss is increased sharply. The wave-shaped oscillation period of the reactor is reduced, and the attenuation speed of amplitude is accelerated, so that presence or occurrence of turn-to-turn short circuit fault of the reactor can be detected accurately. The detecting structure and method are highly practical.

The invention is a power-electronic short-circuit trouble current limiter, composed by using a variable impedance to replace bypass inductance and transformer in the existing short-circuit trouble current limiter. As compared with existing techniques, it not only omits the bypass inductance but also need not design according to working conditions of common transformer because the variable impedance transformer allows the magnetic circuit to enter saturation as short-circuiting, number of turns, iron core section area of the variable impedance transformer, etc, can largely be reduced, the weight, bulk and cost are remarkably reduced, and simultaneously because of the saturation of the transformer iron core and the increase of leakage impedance, the inductance quantity of current limiting impedance can be reduced, making the overcurrent level remarkably reduced. The invention can implement the industrialized wide application of the shor-circuit current limiter to single-phase and three-phase power systems.

A bolt type probe is provided, including a probe head having a bolt at one end thereof, a probe tail having a bolt hole corresponding to the bolt, an elastic element connected with the probe head and the probe tail. At least one portion of the bolt of the probe head is inserted in the bolt hole of the probe tail, and the bolt is moved relative to the bolt hole along with a movement of the elastic element.

The invention discloses a preparation method for a high-power thin-film capacitor. A plastic film is placed in a vacuum high-temperature environment, wherein the temperature of the vacuum high-temperature environment is 1080 to 1120 DEG C and the air pressure of the vacuum high-temperature environment is 0.20 to 0.35 Pa; compound ceramic powder is fused and evaporated and covers a surface of a substrate film; a piece of zinc-aluminium composite metal is evaporated and covers a composite ceramic layer surface to obtain a metalized film electrode; and then the metalized film electrode is wound to obtain a high-power thin-film capacitor. In addition, the plastic film includes the following raw materials, by weight: 55 to 60 parts of polypropylene, 35 to 38 parts of epoxy resin, 22 to 25 parts of terpolycyantoamino-formaldehyde resin, 13 to 16 parts of chlorosulfonated polyethylene, 16 to 19 parts of phenyl ether silicone rubber, 11 to 14 parts of copper oxide, 5 to 8 parts of titanium diboride, 12 to 15 parts of barium sulfate, 6 to 9 parts of glass fibers, 3 to 6 parts of zirconia whisker, 2 to 5 parts of potassium titanate fibers, and 5 to 5.5 parts of silane coupling agents.

The invention discloses a spiral coil structure of lamination chip component inner electrode. The spiral coil is formed by connecting at least two coil units; wherein the spiral coil is single solenoid coil, magnetic line of force is bound in the solenoid coil, the coil unit is formed by connecting at least two stranded electrodes which are in parallel connection from top to bottom and in the same shape, and at least two stranded electrodes are separated by electrically isolated thin magnet, and the two ends of at least two stranded electrodes are respectively connected. The direct current resistance of the spiral coil of the invention can be reduced to 1 / 2 or 1 / N of the existing non-parallel structure, N is number of the stranded electrodes in parallel connection, and the spiral coil is single solenoid coil, magnetic line of force is bound in the solenoid coil, thus magnetic leakage is less, and inductance or impedance reduction amplitude of the spiral coil is less. Stress between electrode and magnet after sintering can be effectively eliminated, not only component magnet cracking is avoided but also diffusion is weaker and short circuit can not be caused.

The invention provides a voltage-reduction structure LED driving circuit, and a constant current driver and a design method of the voltage-reduction structure LED driving circuit. The driver comprises a power switch, a zero cross detection circuit, an on-signal generation circuit and a driving circuit, wherein the power switch is directly or indirectly connected with an inductor in the voltage-reduction structure LED driving circuit, the zero cross detection circuit responds to inductor current and outputs a zero cross detection signal in a zero cross mode, the on-signal generation circuit obtains inductor current duration time according to a driving signal and the zero cross detection signal, determines the inductor current interruption time according to the inductor current duration time and generates a setting signal used for switching on of the power switch so that the ratio from the inductor current duration time to the inductor current interruption time can be kept as a preset value, and the driving circuit is used for generating the driving signal according to a resetting signal for switching off the power switch and the setting signal. Under the condition of the same output current, the peak current of the inductor is increased, the inductance amount of the inductor is reduced, and the driver is particularly suitable for occasions with low output current and low requirement for the inductance amount.

The invention relates to a operating mode and operating control mechanism of electrical switch, which adopts the electromagnet force and the permanent magnetic force generated by a group of permanent magnet and a electromagnet coil to overcome force component of energy accumulation lock-dividing mechanism; it disconnects the holding circuit of the electromagnet coil so that the generated electromagnet force disappears; the lock-dividing force of the energy accumulation lock-dividing mechanism overcomes the electromagnet force to do lock-dividing. The resultant force can be aerodynamic, oil-pressure force or electromagnet force. It cuts of the holding current of the electromagnet coil when it does lock-dividing; it uses the lock-dividing force to above the permanent magnetic force to achieve the lock-dividing after the electromagnet force disappears.

The embodiment of the invention discloses an inductor detecting instrument and an inductor detecting method which are used for detecting a plane inductor. The inductor detecting instrument provided by the embodiment of the invention comprises a radio frequency module and a frequency comparing module, wherein the radio frequency module comprises an inductor and a radio frequency generator; the volume of the inductor is matched with the size of a through hole in a plane inductor on a to-be-measured printed circuit board (PCB); the radio frequency generator is used for outputting a corresponding radio frequency signal according to inductance volume output of the inductor; and the frequency comparing module is used for comparing the frequency of the radio frequency signal outputted by the radio frequency generator with a reference frequency and prompting the plane inductor short circuit when a difference value between the frequency of the radio frequency signal and the reference frequency exceeds a threshold value. The embodiment of the invention also provides the inductor detecting method. According to the inductor detecting method provided by the embodiment of the invention, the plane inductor can be quickly and accurately detected.

The invention provides a variable tuning circuit capable of extending a variable range in a high frequency band, ensuring the value of L of an inductor to increase the value of Q of a circuit in a low frequency band, and preventing a reduction in gain, an increase in noise, and unstable oscillation.A variable tuning circuit includes: a first parallel resonance circuit that includes a varactor diode, a capacitor connected in series to the varactor diode, and a first inductor connected in parallel to the varactor diode and the capacitor; and a second parallel resonance circuit that includes a second inductor connected in parallel to the varactor diode with a direct current cut-off capacitor interposed therebetween. When the varactor diode has a maximum capacitance, a resonant frequency of the second parallel resonance circuit is set about a lowest frequency in a variable frequency range.

The invention discloses an SEPIC feed buck-boost converter comprising an SEPIC circuit, a polarity inversion converting circuit and a controller which are mutually coupled. The SEPIC circuit is connected with a power source. The SEPIC circuit and the polarity inversion converting circuit are connected through a control switch. The polarity inversion converting circuit is connected with a load. When the control switch SISBB is closed, the SPPIC circuit stores the electric energy of the power source in an energy storing coupled inductor of the SEPIC circuit and the polarity inversion converting circuit; meanwhile, an energy storage coupled capacitor feeds back electric energy to the load through the polarity inversion converting circuit. When the control switch is switched off, the power source feeds back electric energy to the load through the SEPIC circuit, and electric energy is fed back to the load by the energy storing coupled inductor of the SEPIC circuit and the polarity inversion converting circuit through the SEPIC circuit and the polarity inversion converting circuit. By the adoption of the SEPIC feed buck-boost converter, the work efficiency of the converter is improved, output follow current of the converter can be achieved, and the output EMI of the converter is reduced.

The invention relates to a testing method for the field high-voltage dielectric dissipation of capacitive transformers, which adopts a frequency modulation series resonance set-up and a cordwood reactance for lap join compensation, three phases are connected in parallel and pressured at the same time, and the three phases are measured one by one or at the same time, thereby overcoming a plurality of defects of the testing power of the traditional method of large volume, cumbersome equipment, troublesome operations and certain influence on the onsite safe operation, etc. The whole testing device has the advantages of less parts, small volume, light weight and functions of anti-interference and testing three to-be-tested devices at the same time, thus being suitable for application on site.