110results about How to "Improve withstand voltage" patented technology

A transistor circuit includes a first high electron mobility transistor and a second high electron mobility transistor having a negative threshold voltage, wherein a source of the second high electron mobility transistor is coupled to a gate of the first high electron mobility transistor, and a gate of the second high electron mobility transistor is coupled to a source of the first high electron mobility transistor. The invention enables the withstand voltages of the high electron mobility transistors to be improved.

A coil device comprising a coil, and a magnetic metal powder containing resin covering said coil. Said magnetic metal powder comprises at least two types of magnetic metal powders with different D50. The magnetic metal powder having larger D50 is defined as a large diameter powder, and the magnetic metal powder having smaller D50 is defined as a small diameter powder among the two types of said magnetic metal powder. Said large diameter powder is made of iron or iron based alloy. Said small diameter powder is made of Ni—Fe alloy. Said small diameter powder has D50 of 0.5 to 1.5 μm. Said large diameter powder and said small diameter powder respectively comprises an insulation coating layer.

The invention discloses an electrolytic capacitor, which is characterized in that conductive polymers and organic acid complex salts are used as electrolytes. The electrolytic capacitor has the following effects: (1) the leakage current is small, and the withstand voltage value is increased; (2) the impedance characteristic is excellent; (3) the stability is excellent; (4) it can be manufactured under simple engineering.

A dry-type transposed conductor air reactor for pre-burying an optical fiber Bragg optical grating temperature measuring shape-changing sensor comprises the optical fiber Bragg optical grating temperature measuring shape-changing sensor, a dry-type air reactor common inter layer structure, a transposed conductor coil winding, a glass fiber packaging layer (a glass-fiber-added cotton belt) and an epoxy glue layer. The dry-type transposed conductor air reactor is characterized in that the optical fiber Bragg optical grating temperature measuring shape-changing sensor is pre-buried in the dry-type air reactor based on the transposed conductor technology, the coil winding of the dry-type air reactor is formed by winding a flat aluminum stranded conductor, and a reactor coil is packaged through glass fiber of the glass-fiber-added cotton belt immersed by epoxy resin. By means of the dry-type transposed conductor air reactor, the high-voltage-resisting level can be improved, temperature rising can be reduced, and the safety of high-voltage power transmission and distribution is improved.

A switch, wherein an encased zero-phase current transformer (36) and a cut-off relay (37) are fitted into the inside edges of both bushings (21, 22). Between each of the zero phase sequence current transformer (36) and the cut-off relay (37) and an unit casing, an elastic pressing element (31c) is provided that presses both the zero phase sequence current transformer (36) and the cut-off relay (37) in the inside direction of the casing. The movement of the zero phase sequence current transformer (36) and the cut-off relay (37) toward the inside of the casing is restricted by an insulating barrier (41). This structure makes it unnecessary to set screws into the inside surface of the casing and improve withstand voltage between the switch and ground.

An objective of the present invention is to implement a small-sized semiconductor device that satisfies clearances required to secure the dielectric strength and allows flow of a large current. The semiconductor device includes a semiconductor element (102) and a lead frame (101). The lead frame (101) includes a first lead (121), a second lead (122), a third lead (123), a fourth lead (124), and a fifth lead (125) placed parallel to one another. The first and second leads are placed adjoining to each other and constitute a first lead group(127), and the third and fourth leads are placed adjoining to each other and constitute a second lead group(128). The spacing between the first lead group and the fifth lead, the spacing between the second lead group and the fifth lead, and the spacing between the first lead group and the second lead group are larger than the spacing between the first lead and the second lead and the spacing between the third lead and the fourth lead.

Disclosed is a method for manufacturing a schottky barrier diode (11), comprising the following steps. A GaN substrate (2) is first provided. A GaN layer (3) is formed on the GaN substrate (2). A schottky electrode (4) is formed that includes a first layer which is formed of Ni or a Ni alloy and formed in contact with the top of the GaN layer (3). The step of forming the schottky electrode (4) comprises the step of forming a metal layer to serve as the schottky electrode (4) and the step of heat treating the metal layer. The dislocation density of a region, in the GaN layer (3), which is in contact with the schottky electrode (4) is not more than 1 108 cm-2.

Disclosed is a non-aqueous electrolyte for a lithium secondary cell or a lithium-ion capacitor in which a lithium salt is dissolved at a specific amount in a non-aqueous solvent, wherein: the non-aqueous solvent contains specific amounts of ethylene carbonate, propylene carbonate, dimethyl carbonate, methylethyl carbonate, and a fluorinated chain ester; the total amount of ethylene carbonate and propylene carbonate contained in the non-aqueous solvent is in a specific range; the total amount of dimethyl carbonate and the fluorinated chain ester contained is in a specific range; and the non-aqueous electrolyte has a flash point of 20 DEG C or higher. Also disclosed is a non-aqueous electrolyte for a lithium secondary cell or a lithium-ion capacitor in which a lithium salt is dissolved at aspecific amount in a non-aqueous solvent, wherein: the non-aqueous solvent contains specific amounts of ethylene carbonate, propylene carbonate, dimethyl carbonate, methylethyl carbonate, and ethyl propionate; the total amount of ethylene carbonate and propylene carbonate contained in the non-aqueous solvent is in a specific range; the total amount of dimethyl carbonate and ethyl propionate contained is in a specific range; and the non-aqueous electrolyte has a flash point of 20 DEG C or higher.

The invention relates to a lumbar-support rotary-type voltage-sharing grounding shielding high-voltage vacuum arc extinguishing chamber solid-sealed polar pole. A conductive seat, a vacuum arc extinguishing chamber and a conductive tube are electrically connected to form a high-voltage circuit and also integrally packaged with a coaxial cylindrical grounding shielding tube through a solid insulating material. Rotary moving contact fingers are installed at the two ends of the solid-sealed polar pole. A slide spring contact finger and a direct-acting disc spring cylinder assembly rod piece are installed in the conductive tube. The solid-sealed polar pole is fixed through lumbar support and wires enter and exit at the two ends of the solid-sealed polar pole. Under alternative linear and rotary driving of a four-station integrated operation mechanism of a high-voltage vacuum isolation circuit breaker, the vacuum arc extinguishing chamber in the solid-sealed polar pole can be enabled to switch on or switch off so that a circuit breaker function is realized and positive and reversed 90-degree rotation can also be carried out so that the three-phase polar pole of the high-voltage vacuum isolation circuit breaker is enabled to realize switching of a work position and an isolation position and thus a disconnecting switch function is realized and a clear and visible double-isolation fracture is arranged at the isolation position. The product design has the advantages of being compact in structure, small in size, free from maintenance, mixed in use and reliable in operation and the like.

The invention discloses a MEMS sensing device for electric field measurement based on a piezoelectric-magnetic anisotropy coupling structure. The device comprises piezoelectric materials. The bottom surface of the piezoelectric materials adheres to a bottom metal, and the top surface of the piezoelectric materials adheres to a ferromagnetic membrane and a metal electrode. The beneficial effect isthat: the device has a large measuring range, a high sensitivity, a fast transient response speed, an electric field measurement range with a wide band and a high field strength, a good temperature stability, a high integration degree and a small size; the device provides a high-performance, low-cost, safe and reliable electric field sensor for the fields of electric power systems, aerospace, meteorological monitoring and the like.

The invention relates to a lithium-ion power battery electrolyte. The lithium-ion power battery electrolyte comprises four components, namely, quaternary ammonium chloride, a hydrogen bond donor, lithium salt electrolyte and polyethylene glycol PEG, wherein the mole ratio of the quaternary ammonium chloride and the hydrogen bond donor is (1 to1)-(1to3); the concentration of the lithium salt electrolyte in the electrolyte is 0.1-3.0mol/L, and the PEG is 0.1%-90% of total mass of the electrolyte. On one hand, an ionic liquid guarantees the high security and fire resistance of electrolysis, on the other hand, and the price of the lithium-ion power battery electrolyte is low; meanwhile, a PEG component is added in the electrolyte, the compatibility of an electrolyte and a lithium-ion battery material is improved, and the property of electrolyte is improved. The lithium-ion power battery electrolyte provided by the invention has properties of good security property, fire resistance, high temperature characteristic and withstand voltage property and the like.

The invention relates to electrolytic capacitor paper and a preparation method thereof. Raw paper pulp of voltage-resistant electrolytic capacitor paper is composed of low-beating-degree sisal pulp and high-beating-degree sisal pulp according to a mass ratio of 20-40:80-60, beating degree of the low-beating-degree sisal pulp is 20-60 degrees SR while wet weight of the same is 2-16g, and beating degree of the high-beating-degree sisal pulp is 60-98 degrees SR while wet weight of the same is 2-10g; the raw paper pulp is formed and composited through the twin-cylinder net, coating liquid is coated on the surface of paper after pressing and drying, coating amount is 0.2-1.2g/m2, and the coating liquid is composed of nano cellulose and carboxy modified PVA according to a mass ratio of 4:3-1:10.The electrolytic capacitor paper has high strength, good water absorbing performance, low loss and excellent voltage resistance, and voltage resistance value is increased by more than 80V.

The invention discloses a direct-current circuit breaker and an application method thereof. The direct-current circuit breaker is characterized in that a through-current branch circuit is connected in series into a power line; a controlled power supply unit is connected with the through-current branch circuit, an oscillation branch circuit and a grounding unit; and an energy consumption branch circuit can be connected with the main through-flow branch circuit in parallel and can also be connected with the oscillation branch circuit. When the power line does not have a fault, the through-flow branch circuit conducts a direct-current load current, a direct-current system pre-charges the oscillation branch circuit and the controlled power supply unit, and the oscillation branch circuit realizes self-energy taking; and when a short-circuit fault occurs in the power line, the oscillation branch circuit generates an oscillation current which is equal to a fault current in amplitude and opposite to the fault current in direction by controlling the operation states of the controlled power supply unit and the through-flow branch circuit, so that the through-flow branch circuit is reliably turned off, the amplitude of an injection current is improved by adopting a controlled active oscillation boosting principle, and arc extinguishing on-off of the through-current branch circuit is realized.

The invention provides a transformer neutral point capacitive DC blocking device adopting a high-capacity high-voltage capacitor and BOD protection. The device comprises an isolating switch, the high-capacity high-voltage capacitor, a voltage divider, a resistor, a discharging gap, a current mutual inductor and a current sensor. The isolating switch, the high-capacity high-voltage capacitor, the current sensor and the current mutual inductor are connected in series and connected between the neutral point of a transformer and the ground. The voltage divider, the resistor and the discharging gap are respectively connected in parallel with the high-capacity high-voltage capacitor. After the device is connected in series with the neutral point of the transformer, DC current entering the neutral point of the transformer can be effectively eliminated without influencing normal grounding of an AC system or passing of AC zero sequence current so that safe operation of the system can be ensured. The device is easy and convenient to operate, compact in structure, small in size and convenient to transport without influencing the overall layout of intra-station equipment after installation. Besides, the high-capacity high-voltage capacitor is high in withstand voltage, high in current withstand capacity and also high in safety and reliability.