19results about How to "Large resistance" patented technology

The invention relates to a pressure sensor, a pressure sensing array and a preparation method thereof. The pressure sensor comprises a first substrate, the upper surface of which is provided with a first sensing electrode; the first pressure-sensitive layer is located on the surface of the first sensing electrode, and the first pressure-sensitive layer is a piezoresistive film with a microphase separation structure and a rough upper surface; the lower surface of the second substrate is provided with a second sensing electrode, and the second sensing electrode and the first sensing electrode are oppositely arranged; the second pressure-sensitive layer is located on the lower surface of the second sensing electrode, the second pressure-sensitive layer is a piezoresistive film with micro-phase separation and a rough lower surface, and the lower surface of the second pressure-sensitive layer is opposite to the upper surface of the first pressure-sensitive layer. The pressure sensor provided by the invention has higher sensitivity under high pressure and thin thickness.

The invention belongs to the technical field of semiconductor devices, and particularly relates to a high-heat-dissipation GaN nanowire radio frequency device and a preparation method thereof.The radio frequency device comprises a heterogeneous bonding substrate, a bonding middle layer, an AlGaN / GaN nanowire (a GaN channel layer, an AlN insertion layer, an AlGaN barrier layer and a GaN cap layer), a passivation layer and an electrode layer, and the electrode layer comprises a source electrode, a gate electrode and a drain electrode; the passivation layer covers the gaps between the nanowires through front deposition, so that the preparation of the high-heat-dissipation nanowire transistor is realized, and the problem that the linearity of the device is reduced due to a self-heating effect is solved; holes are formed in the grid electrode, the thickness of the passivation layer on each nanowire is controlled, equal difference distribution is achieved, the linearity of the device is improved through the transconductance compensation effect, the grid voltage swing of the radio frequency device can be effectively improved, and therefore the available range of the device is greatly widened.

The invention discloses soft tissue high-frequency welding equipment, and belongs to the technical field of surgical operating instruments, the soft tissue high-frequency welding equipment comprises an electrocoagulation pen main body, the electrocoagulation pen main body is connected with an insulating rod, the insulating rod is further provided with a conduction pipeline parallel to a cutter head part, and a temperature sensing unit comprises a hinting structure and a telescopic action structure. The electric resection temperature of the knife head part can be sensed in real time through the action structure in the temperature sensing unit, and when the knife head part is overheated, the action structure can be converted into an extension state from an initial retraction state and triggers the indicating structure to protrude out of the surface of the electrocoagulation pen main body, so that a doctor is reminded to cool the knife head part in time; therefore, in the electric resection operation process of the hypertrophy tonsil and adenoid body of the child, the situation that the scalpel head part is overheated in the long-time continuous state of the operation and burns the tissue of the affected part of the child is effectively avoided, the safety of the soft tissue resection operation of the child is improved, and postoperative recovery and healing of the operative part of the child are facilitated.

The invention relates to the technical field of dustproof cleaning, in particular to an engineering project site dustproof cleaning device which comprises a shell, the side wall of the shell is fixedly connected with an air pump through a support, and an input pipe of the air pump is fixedly connected with the shell in a penetrating mode; a cleaning mechanism is arranged in the shell and composed of an airflow assembly, a dust falling assembly and a control assembly, the airflow assembly comprises an air channel and a dust falling cavity, the dust falling cavity is formed in the shell and communicated with the outside through the air channel, and an input pipe of the air pump penetrates and extends into the dust falling cavity. The shell is rotationally connected with a rotating shaft in a penetrating mode through a bearing, the dust falling assembly comprises two side cavities and a water cavity, and the side cavities and the water cavity are both formed in the shell. The device disclosed by the invention has the advantages that the device can avoid the severe field environment and the waste of water resources while spraying and settling dust, and meanwhile, the spraying and settling speed can be automatically adjusted, so that the automation degree is higher.

The invention relates to a pressure sensor, a pressure sensing array and a preparation method thereof. The pressure sensor includes: a first substrate; the first sensing electrode is positioned on the upper surface of the first substrate; the first insulating layer is located on the surface of the first sensing electrode and comprises a plurality of first microspheres arranged in an array or is a first hollow film layer; the first pressure-sensitive layer is positioned on the surface of the first insulating layer and is filled in a first gap in the first insulating layer; a second substrate over the first substrate; the second sensing electrode is positioned on the lower surface of the second substrate; the second insulating layer is located on the surface of the second sensing electrode, and the second insulating layer comprises a plurality of second microspheres arranged in an array or a second hollow film layer; and the second pressure-sensitive layer is located on the surface of the second insulating layer, and the second gap in the second insulating layer is filled with the second pressure-sensitive layer. The pressure sensor provided by the invention has higher sensitivity under high pressure and thin thickness.

An auxiliary apparatus and a vehicle, which relate to the technical field of automobiles. The auxiliary apparatus includes: a base body having an accommodation cavity, the accommodation cavity having an open end; an auxiliary mechanism (2) disposed in the accommodation cavity; a cover body (3) movably disposed at the open end and movable relative to the open end between an open position and a closed position, the cover body (3) being entirely accommodated in the accommodation cavity when the cover body (3) moves from the closed position toward the open position; and at least one power mechanism disposed in the accommodation cavity, one of the at least one power mechanism being used for driving the auxiliary mechanism (2) to extend and retract through the open end. The auxiliary apparatus can prevent the auxiliary mechanism (2) and the cover body (3) from being extended together, and prevent the auxiliary apparatus from generating large wind resistance and wind noise when it is used.

The invention discloses a magnetic random access memory unit, a magnetic random access memory, a phase inverter and a memory, and the magnetic random access memory unit comprises a substrate; the free layer structure is located on the substrate, the free layer structure comprises one or more layers of stacked structures, the stacked structures comprise a first free layer and a plurality of second free layers which are located in the first free layer and are separated from each other, and the first free layer and the second free layers are made of different materials; the multiple layers of stacked structures are stacked in the direction perpendicular to the surface of the substrate; a tunnel layer on the free layer structure; and the fixed layer is positioned on the tunnel layer. The magnetic random storage unit can be used as a basic unit of a logic device and a memory, so that the logic device and the memory have relatively low power consumption, relatively low working voltage and high-temperature reliability.

This application discloses a heating element, an atomizing module, an atomizer, and an electronic atomizing device. It belongs to the field of aerosol generation technology. In the heating element of this application, by setting the heating wire to alternately connect a first part and a second part, and by having different resistance values ​​for the first and second parts, the temperatures of the first and second parts are different when the heating element is energized. Therefore, the part with higher resistance has a relatively higher temperature, and the part with lower resistance has a relatively lower temperature. Thus, the temperature distribution of the heating wire is also an alternating distribution of high and low temperatures, effectively avoiding high temperatures concentrated in the middle of the heating wire, which would cause excessive heat and carbon buildup at that location. Furthermore, the relatively higher temperature part in the first and second parts can directly transfer the high temperature to the adjacent relatively lower temperature part, thereby improving the heat dissipation effect of the heating element.

The application provides a data reading circuit of an MRAM chip, comprising: a to-be-tested storage unit, a first gating transistor connected in series with the to-be-tested storage unit, a reference unit, a second gating transistor connected in series with the reference unit, and a readout amplifier, wherein the reference unit has three optional reference resistance branches, including a working mode branch, a first test mode branch and a second test mode branch, the working mode branch is used for reading data of the to-be-tested storage unit, the first test mode branch is used for screening out fixed failure units and high-resistance state out-of-range failure units with an open-circuit failure type, and the second test mode branch is used for screening out fixed failure units and low-resistance state out-of-range failure units with a short-circuit failure type.

The utility model belongs to the technical field of batteries, and discloses a battery which comprises a shell, a positive pole and a winding battery cell, the positive pole is mounted on the shell and insulated from the shell, the winding battery cell is arranged in the shell and comprises a positive plate, a negative plate and a winding diaphragm, the negative plate wraps the positive plate, and the winding diaphragm wraps the positive plate. And the winding diaphragm is arranged between the positive plate and the negative plate. The outermost side of the wound positive plate is provided with a positive leading-out end, the negative current collecting strip of the negative plate is electrically connected with the shell, and the positive leading-out end is electrically connected with the positive column through the positive current collecting strip. The processing technology of the battery is simple, the strength of the shell can be ensured, a circuit can be timely disconnected from the inside under the condition of external short circuit, and the battery has relatively high safety performance.

The present invention relates to the technical field of overcurrent protection, and discloses a method for intelligent overcurrent protection of a power supply, including: constructing an overcurrent protection system for a circuit to be protected; when the current current value of the circuit to be protected does not exceed a predetermined current value, temporarily adjusting the resistance of a thermistor to obtain a temporary adjustment resistor; using historical power supply voltage to analyze the planned power supply voltage of the circuit to be protected in the future period, analyzing the planned circuit load of the circuit to be protected in the future period, and analyzing the planned circuit current of the circuit to be protected in the future period; judging whether the circuit to be protected will have circuit overcurrent in the future period; identifying the overcurrent moment when the circuit to be protected will have circuit overcurrent, performing overcurrent protection processing on the circuit to be protected according to the overcurrent moment, and obtaining a first overcurrent protection result; performing overcurrent protection processing on the circuit to be protected using a thermistor. The present invention can alleviate the problem that thermistors cannot completely suppress overcurrent through preventive overcurrent protection.

The invention discloses a quiescent current detection circuit and device, and relates to the technical field of current detection. The resistors in the voltage dividing network are sequentially connected between the power supply and the ground in series, and the resistance values of the resistors are sequentially increased in a multiplied manner, so that the wide-range coverage from nA to 1A is realized. And each resistor in the voltage dividing network corresponds to each measuring gear, so that the precision measurement that one measuring range corresponds to one measuring gear is realized. The external pin corresponding to the first end of the voltage division network is connected to the measurer, and the quiescent current of the module to be tested can be judged by testing the voltage corresponding to different current target resistors, the voltage value measured by the measurer, the known resistance value of the voltage division network and the known resistance value of the current sampling circuit. Complicated detection instruments do not need to be adopted, the detection mode and peripheral detection instruments are simple, scene adaptability is high, detection circuit devices are few, cost is low, universality is high, and large-scale application is easy. And the requirements of relatively large measuring range and relatively high sensitivity can be met.

Disclosed are a porous transport layer and a preparation method therefor. The preparation method includes the following steps: S1, machining side-by-side elongated recesses on one side surface of a metal sheet; S2, cutting the metal sheet provided with the elongated recesses into a desired shape; S3, stacking a plurality of cut metal sheets such that adjacent metal sheets are tightly attached and firmly connected to form a metal block having regular pore structures inside; and S4, cutting the metal block along a cross section of the metal block, where the cutting thickness matches the thickness of the desired porous transport layer, and a cut sheet structure with micropores being regularly distributed on the surface is used as the porous transport layer. The present invention can solve the problems that titanium fiber felts in the prior art have poor diversion performance, low contact efficiency and large contact surface resistance.

The invention discloses a self-adaptive soft turn-off circuit of a power switch device, and relates to the technical field of electronic circuits, the self-adaptive soft turn-off circuit comprises a turn-off control module, a detection module, an energy storage delay module and a soft turn-off execution module, and the detection module and the energy storage delay module are connected in series and then are connected between a drain electrode and a source electrode of the power switch device. The detection module, the energy storage delay module and the power switch device form a drain-source electrode loop, and the energy storage delay module is controlled to store energy or discharge when a comparison result of drain-source electrode voltage and a preset safety threshold value in the turn-off process of the power switch device. And dynamically adjusting the resistance value of the soft turn-off resistor connected to the grid electrode of the power switch device according to energy storage or discharge, and adjusting the turn-off speed of the power switch device. A control signal is generated through energy storage, the resistance value of a soft turn-off resistor connected into a grid electrode of a power switch device is dynamically adjusted, the turn-off speed of the power switch device is reduced, and therefore voltage spikes are restrained.

A forming method of a magnetic random storage unit comprises the following steps: providing a substrate; a free layer structure is formed on a substrate, the free layer structure comprises one or more layers of stacked structures, each stacked structure comprises a first free layer and a plurality of second free layers which are located in the first free layer and are separated from each other, and the first free layers and the second free layers are made of different materials. The multiple layers of stacked structures are stacked in the direction perpendicular to the surface of the substrate; forming a tunnel layer on the free layer structure; a fixing layer is formed on the tunnel layer. The magnetic random storage unit can be used as a basic unit of a logic device and a memory, so that the logic device and the memory have relatively low power consumption, relatively low working voltage and high-temperature reliability.

This utility model belongs to the field of power battery safety technology, and discloses a power battery terminal and cell with a fusible protection structure. The terminal includes a terminal body, which comprises a substrate layer and a fusible layer stacked on top of each other. The fusible layer has a hollowed-out fusible area, within which at least one cavity is formed. A high-resistivity material layer is deposited on the inner wall of the cavity. The hollowed-out fusible area of ​​the terminal body of this utility model has a cavity, and the high-resistivity material is deposited on the cavity surface. This reduces the current-carrying area of ​​the terminal and increases the terminal resistance, allowing heat to accumulate rapidly at the terminal to the material's melting point during a short circuit, quickly melting and blocking the current, thus reducing the risk of thermal runaway of the cell.

The invention provides a multi-layer mica sheet aluminum shell resistor, and belongs to the technical field of resistors, the multi-layer mica sheet aluminum shell resistor comprises a resistor shell, a cooling unit and a fixed connection unit, the cooling unit is arranged below the resistor shell, the cooling unit comprises a cooling box, the lower wall surface of the resistor shell is fixedly connected with the cooling box, and the lower wall surface of the resistor shell is fixedly connected with the fixed connection unit. And a cooling plate is arranged in the cooling box. The invention solves the problems that the size of the resistor is large, the resistor with large power and small size cannot be met, the resistor is assembled by a fastener during daily use, the separation and the assembly are not very convenient, the contact between the lower part of the resistor and the assembly surface is not friendly to heat removal and temperature reduction, and in some assembly conditions, the cost is low. And the resistor is easily influenced by oscillation and the like.

To provide a practical microneedle preparation through finding an appropriate application condition regarding a geometric shape and a position on a needle of an applied material in a coated type microneedle. A microneedle array having a needle length of 350 um or more and 1,500 um or less and a diameter of a needle tip section apex of 15 um or more and 100 um or less, having a drug-applied portion, and comprising a non-biosoluble substance, preferably a non-biosoluble polymer, as a base, wherein no drug is applied to the needle tip section apex. It is preferable that the upper end of the drug-applied portion is a position 30 um or more lower than the needle tip section apex. The maximum diameter of the drug-applied portion is preferably 300 um or less.

The application discloses a resistance adjusting jig for adjusting resistance value of a bent resistor. The resistance adjusting jig comprises a base, a positioning table upwardly protruding on the base, a probe assembly, two groups of test pins of the probe assembly being arranged at two ends of the positioning table in the transverse direction and used for contacting a pin area of the bent resistor, and a pressing mechanism, a driving assembly of the pressing mechanism being capable of driving a pressing block to move in the up-down direction above the positioning table, and a material hardness of at least a lower end portion of the pressing block being greater than that of a flat plate portion of the bent resistor. In the resistance adjusting process, the flat plate portion is clamped between the pressing block and the positioning table, and locally plastically deformed under the pressure in the up-down direction, and according to the strain gauge effect, the deformation makes the effective conductive length of the flat plate portion slightly increase and the cross-sectional area slightly decrease, so that the resistance value is increased. The resistance adjusting is realized by the pure physical mechanical compression mode, the material discontinuity problem caused by the existing cutting or corrosion process is avoided, and the stability and reliability of the resistor after the resistance adjusting are effectively improved.