172results about How to "Increased current capability" patented technology

The invention discloses an optimal two-vector combination-based model predictive control method and system. The method is applied to a permanent-magnet synchronous motor control system driven by a three-phase two-level inverter. A model predictive current control strategy is adopted, all two-vector combinations and resultant vector sets obtained under action time are considered at the same time, and a cost function is inspected and an optimal resultant vector is selected from all to-be-selected sets. In order to simplify the optimization process, an equivalent voltage equation is given, a sector transformation method is provided and to-be-selected two-vector combination sets are transformed into multiple fixed line segments; and a fast algorithm is given and partial complicated calculation is transformed to offline execution, so that the real-time calculated amount of the novel method is effectively reduced. The model predictive control method disclosed by the invention is simple in structure, small in real-time calculated amount and easy to implement; and the response speed of a motor is high, current ripples and distortion are small, the switching frequency is low and the dynamic and static performance of the system is excellent.

The invention discloses a novel large-current silicon on insulator lateral insulated gate bipolar transistor. According to the semiconductor, a buried oxide is arranged on a P-type substrate, an N-type drift region is arranged on the buried oxide, a P-type body region and an N-type buffer region are arranged on the N-type drift region, the N-type buffer region is internally provided with a P-type collector region, a collector metal is connected onto the P-type collector region, a field oxygen layer is arranged above the N-type drift region, the P-type body region is internally provided with a P-type emitter region, an N-type emitter region is arranged around, an emitter metal is connected onto the N-type emitter region and the P-type emitter region, a gate oxide is arranged between the field oxygen layer and the N-type emitter region, a first polysilicon layer is arranged on the surface of the gate oxide, a first gate metal is connected onto the surface of the first polysilicon layer, a longitudinal groove is arranged outside the P-type body region, the longitudinal groove is internally provided with silicon dioxide and a second polysilicon layer coated by other medium, and a second gate metal is connected onto the second polysilicon layer.

The invention discloses a quantum dot electroluminescent device and a preparation method thereof. In order to reduce the hole injection barrier of a quantum dot light emitting diode device, small molecular materials containing polar coordination groups of lone pair electrons, such as materials containing amino groups, mercapto groups or phosphorus groups, are dissolved in a proton solvent throughin-situ ligand replacement and the obtained product is applied to a filmed quantum dot layer after heat treatment during the preparation of the quantum dot light emitting diode device. Because of thepolar coordination groups (amino groups, mercapto groups and phosphorus groups) of lone pair electrons, a larger interface dipole is introduced, the hole injection barrier is reduced, the hole electron flow is balanced, and the device performance is improved. The surface defects of the quantum dot film are passivated, and exciton quenching is reduced. The method has the characteristics of wide applicability, high efficiency and simplicity.

A biased gap inductor includes a first ferromagnetic plate, a second ferromagnetic plate, a conductor sandwiched between the first ferromagnetic plate and the second ferromagnetic plate, and an adhesive between the first ferromagnetic plate and the second ferromagnetic plate, the adhesive comprising magnet powder to thereby form at least one magnetic gap. A method of forming an inductor includes providing a first ferromagnetic plate and a second ferromagnetic plate and a conductor, placing the conductor between the first ferromagnetic plate and the second ferromagnetic plate, adhering the first ferromagnetic plate to the second ferromagnetic plate with a composition comprising an adhesive and a magnet powder to form magnetic gaps, and magnetizing the inductor.

The invention discloses a bidirectional power device and a manufacturing method thereof. The bidirectional power device comprises: a semiconductor layer; a groove located in the semiconductor layer; agate dielectric layer located at the side wall of the groove; a control gate located at the lower portion of the groove; a shielding gate located at the upper portion of the groove; and an isolationlayer located between the control gate and the shielding gate, wherein the control gate is separated from the semiconductor layer by the gate dielectric layer. The shielding gate is located at the upper portion of the control gate which is mutually separated from the shielding gate, and is separated from a source and a drain through a shielding dielectric layer, and when the bidirectional power device is cut off, the shielding gate depletes charges of a second doped region through the shielding dielectric layer, and the voltage-withstanding characteristic is improved. When the bidirectional power device is conducted, the source and/or the drain and the semiconductor layer provide a low-impedance conduction path.

The invention discloses a PVC (polyvinyl chloride) home decorative sheet which is prepared from the following raw materials according to a weight proportion: 20 to 30 of PVC resin powder; 10 to 30 of colloidal calcium carbonate; 90 to 150 of PVC recycled materials; 1.5 to 2.0 of composite stabilizer; 6 to 9 of foaming control agent; 1 to 1.8 of composite foaming agent; 0.2 to 0.5 of plasticizer, 0.5 to 0.7 of internal lubricant, 0.1 to 0.3 of external lubricant, and 0.025 to 0.035 of whitening agent. The PVC recycled materials comprise a PVC decorative template recycled material, a white PVC plastic steel window recycled material and a white PVC pipe recycled material; the composite foaming agent is formed by mixing a white foaming agent and a yellow foaming agent. The invention further discloses a preparation method of the PVC home decorative sheet. According to the PVC home decorative sheet and the preparation method thereof, which are disclosed by the invention, the PVC recycled materials are used as one of the main raw materials, wastes are changed into treasures, production cost is reduced, energy is saved, hardness and weather resistance of the product are improved, recycling times are increased, the recycling times can reach 35 times or above, moreover, the preparation method is easy to operate, and the prepared product is smooth and attractive in surface. The PVC home decorative sheet disclosed by the invention is energy-saving, environmental-friendly, low in production cost and long in service life.

The invention discloses a glass insulator used for encapsulation connection between the metal end cover and the metal conductive columns of the wiring terminal of a compressor. The glass insulator comprises the components with the weight percentage as follows: 92-94 percent of SiO2, 3-4 percent of Al2O3, 0.5-1 percent of Bi2O3, 0.5-1 percent of TiO2 and 1.5-2.5 percent of SrO, preferably, 93 percent of SiO2, 33.3 percent of Al2O3, 0.7 percent of Bi2O3, 0.8 percent of TiO2 and 2.2 percent of SrO. The glass insulator not only has favorable insulating performance and avoids flashover generated during operation, but also has low probability of generation of crackle under the long-term action of the alternating current of the metal columns, therefore an explosion hazard of the compressor is avoided, and the glass insulator is suitable for widely applied in the wiring terminal of the compressor.

The invention discloses a bidirectional power device and a manufacturing method thereof. The bidirectional power device comprises: a semiconductor layer; a groove located in the semiconductor layer; agate dielectric layer located at the side wall of the groove; a control gate located at the lower portion of the groove; and a shielding gate located at the upper portion of the groove, wherein the control gate is in mutual contact with the shielding gate, and the control gate is separated from the semiconductor layer by the gate dielectric layer. The shielding gate is located on the control gatewhich is in mutual contact with the shielding gate, and is separated from a source and a drain through a shielding dielectric layer, and when the bidirectional power device is cut off, the shieldinggate depletes charges of a second doped region through the shielding dielectric layer, and the voltage-withstanding characteristic is improved. When the bidirectional power device is conducted, the source and/or the drain and the semiconductor layer provide a low-impedance conduction path.

Electronic devices (10, 30, 50) utilizing electrically-controlled liquid components to accomplish device switching. Electric fields are used in a device structure to manipulate the position and/or geometrical shape of a conductive fluid or liquid (60, 24) using electrowetting. This manipulation regulates the flow of current between electrodes of the device structure, such as the source and drain regions (16, 20) of a transistor construction, by bridging a non-conductive channel (15) separating the electrodes (16, 20) so that the electrodes (16, 20) are electrically coupled.

The invention provides a PVC (polyvinyl chloride) advertisement template. The PVC advertisement template is prepared from, by weight, 60-90 parts of PVC resin powder, 20-50 parts of PVC reclaimed materials, 30-60 parts of active light calcium carbonate, 2.5-4 parts of compound stabilizer, 5-12 parts of foaming control agent, 1.2-2.25 parts of compound foaming agent, 0.2-0.6 part of plasticizer, 0.7-1.5 parts of lubricant, 0.3-1 part of titanium dioxide and 0.01-0.04 part of brightening agent, wherein the compound foaming agent is formed by mixing an inorganic foaming agent with an organic foaming agent, and the lubricant is formed by mixing PE wax, stearic acid and an internal lubricant ZB-60. The invention further provides a preparation method of the PVC advertisement template. The PVC advertisement template and the preparation method thereof have the advantages that since the PVC reclaimed materials are used as one of main raw materials, turning waste into wealth, production cost reduction and energy saving are achieved, hardness and weather fastness of the PVC advertisement template are improved, the number of recycling times can be increased and reach more than 35, and the PVC advertisement template is smooth and attractive in surface; the preparation method is easy to operate.

The invention discloses a novel differential- and common-mode filter inductor structure. The filter inductor structure comprises a first magnetic core, a second magnetic core, a third magnetic core, afourth magnetic core, a first copper strip and a second copper strip, wherein the first magnetic core is attached onto the second magnetic core, a first through hole and a second through hole are simultaneously formed between the first magnetic core and the second magnetic core and communicate with each other via a first air gap, the third magnetic core is attached onto the fourth magnetic core,a third through hole and a fourth through hole are simultaneously formed between the third magnetic core and the fourth magnetic core and communicate with each other via a second air gap, the first copper strip and the second copper strip are used as windings, the first copper strip penetrates through the second through hole and the fourth through hole, and the second copper strip penetrates through the first through hole and the third through hole. The differential- and common-mode filter has the advantages of compact structure, high current through capability and good filtering performance,moreover, filtering characteristics can be configured, and modular expansion can be performed.

The embodiment of the invention discloses a power device chip and aims to improve the current capability of the power device chip. The chip comprises a plurality of unit cells which are in the same shape and are seamlessly jointed on a plane; a unit cell grid medium layer on the plane is in a shape that the perimeter of the unit cell grid medium layer is larger than the perimeter of a square when the area of the unit cell grid medium layer is same as that of the square, because the ratio of the width to the length of a groove in a unit area is an important factor for deciding the current capability of the chip. Under the condition that the process is fixed, the length of the groove is fixed and the width of the groove is approximately similar to the perimeter of the unit cells, thus the scheme provided by the embodiment of the invention improves the current capability of the power device chip.

The invention discloses a 4H-SiC MOSFET power device and a manufacturing method thereof. The power device comprises a source electrode (1), an SiO2 interlayer dielectric (2), a grid electrode (3), a gate oxide layer (4), a P + contact region (5), an N+ source region (6), a P well (7), an additionally injected P-type region (8), an N type epitaxial layer (9), an N-epitaxial layer (10), a buffer layer (11), an N+ substrate (12) and a drain electrode (13). The 4H-SiC MOSFET power device disclosed in the invention adopts a separation grid structure, and by virtue of the structure the input capacitance and the grid leakage capacitance can be effectively lowered, and the switching performance of the device is improved; by introducing P type doping in a JFET region, the electric field intensity of a gate oxide layer can be effectively reduced, and the reliability of the device is improved; and in addition, a current expanding layer structure is adopted, so that the current capability of the device can be considered.

The invention discloses an IGBT module packaging structure of an inverter. The positive input end and the negative input end of each half-bridge IGBT module are respectively arranged on the lower surface of a chip. A buffer capacitor can be respectively welded on the surfaces of the positive input end area and the negative input end area on the surface of a first insulation ceramic substrate, thereby maximally eliminating pin inductance of the IGBT module through short-circuit. An E pole of an upper half-bridge IGBT chip and a C pole of the lower half-bridge IGBT chip of each half-bridge IGBT module are respectively arranged on the upper surface of the chip, and can be located far from a water cooling board, thereby reducing an equivalent parasitic capacitance, reducing earth common-mode interference current, and improving EMC performance of the inverter. A binding line of each phase half-bridge IGBT module is saved, thereby improving current capability and prolonging service life time, reducing chip area and lowering inverter cost. Electric pins of each phase half-bridge IGBT module are directly welded on the insulation ceramic substrate and a chip. The distances among the positive input end, the negative input end and phase output pin of each phase half-bridge IGBT module are small, thereby realizing short outlet wire of the inverter, simplifying wiring and ensuring no easy heating of an inner chamber by copper bars.

The invention relates to a semiconductor device and discloses a double-gate SOI-LIGBT device with a P-type buried layer. Under the condition that voltage resistance is ensured, the current capacity of the device is enhanced. According to the double-gate SOI-LIGBT device, the P-type buried layer is additionally arranged, traditional bulk silicon is changed into polycrystalline silicon for serving as filling materials of a separation groove, the separation groove is connected with a gate end electrode through a metal structure and accordingly serves as a gate electrode in the lateral direction of the device. The double-gate SOI-LIGBT device not only can serve as a gate field plate to be shrunk into an electric field near a channel region for meeting the voltage resistance requirement. Meanwhile, the double-gate SOI-LIGBT device can serve as a longitudinal gate electrode so that the current can stream on the surface and can also stream below the P-type buried layer in a device body area, the current capacity is enhanced, on-resistance is reduced, and therefore the size of the device in the width direction can be shortened under the condition that the voltage resistance is ensured. The double-gate SOI-LIGBT device with the P-type buried layer is suitable for a PDP scanning driving chip.

The protection circuit includes N type metallic oxide buffer (Nch Buffer) transistor, and a diode string. Grid of (Nch Buffer) transistor is connected to ground. Substrate is connected to cathode of diode at tail of the diode string. Anode of diode at header of the diode string is connected to previous stage of the internal circuit. When static discharge occurs, before Nch Buffer transistor turns on, the diode string generates current, which provides substrate current for Nch Buffer transistor, and generates substrate bias voltage so as to trigger Nch Buffer transistor. When static discharge occurs, the invention triggers and turns transistor to on quicker, provides larger current release capability, and turns transistor to on uniformly.

The invention discloses a bidirectional power device and a manufacturing method thereof. The bidirectional power device comprises a semiconductor layer; a trench in the semiconductor layer; a gate dielectric layer which is positioned on the side wall of the trench; a control gate which is positioned in the trench and extends from the first surface of the semiconductor layer to the lower part of the trench, wherein the control gate and the semiconductor layer are separated by the gate dielectric layer. According to the invention, the control gate in the trench extends from a first surface of asemiconductor layer to a lower portion of the trench, and a source region and a drain region extend from the first surface of the semiconductor layer to overlap the control gate at the lower portion of the trench. The extending lengths of the source region and the drain region are greater, so that the source region and the drain region can bear a high voltage applied to the source region and the drain region in the longitudinal direction when the bidirectional power device is cut off, and the voltage withstanding characteristic of the bidirectional power device is improved.