41results about How to "Control offset" patented technology

This invention describes how to quickly cancel DC offsets that are present in the two quadrature paths of a zero intermediate frequency transceiver. Previously known techniques are not suitable for the 5 GHz WLAN standards because of the very short transmit to receive turn around times and extraordinarily large dc offsets in these systems. This invention solves the above problems. The present invention uses both AC and DC coupling along with automatic gain control techniques to remove unwanted DC offsets within an acceptable time period. The invention further uses a digital signal processor to estimate and subtract out the DC offset errors using time averaged signals. The digital signal processing circuit is capable of further AC filtering and Analog to Digital conversions.

This invention describes how to quickly cancel DC offsets that are present in the two quadrature paths of a zero intermediate frequency transceiver. Previously known techniques are not suitable for the 5 GHz WLAN standards because of the very short transmit to receive turn around times and extraordinarily large dc offsets in these systems. This invention solves the above problems. The present invention uses both AC and DC coupling along with automatic gain control techniques to remove unwanted DC offsets within an acceptable time period. The invention further uses a digital signal processor to estimate and subtract out the DC offset errors using time averaged signals. The digital signal processing circuit is capable of further AC filtering and Analog to Digital conversions.

In sophisticated semiconductor devices, a strain-inducing semiconductor alloy may be positioned close to the channel region by forming cavities on the basis of a wet chemical etch process, which may have an anisotropic etch behavior with respect to different crystallographic orientations. In one embodiment, TMAH may be used which exhibits, in addition to the anisotropic etch behavior, a high etch selectivity with respect to silicon dioxide, thereby enabling extremely thin etch stop layers which additionally provide the possibility of further reducing the offset from the channel region while not unduly contributing to overall process variability.

The present invention provides a ramp generator capable of appropriately setting a rise starting point of an output voltage of a ramp waveform and an output voltage at the time of stable output. A current adjustment unit including a differential pair of transistors and an amplifier constitute a feedback circuit. By controlling the charging / discharging of an integration capacitor by ON / OFF of a discharge current source connected to a common emitter terminal of the current adjustment unit, an output of the ramp waveform outputted from an output terminal disposed at the connection end of the integration capacitor is controlled.

The invention relates to the field of foundation pit engineering enclosure structure construction, in particular to a construction method for a RJP utilized reversely built enclosure structure. The method comprises the following steps that grouting reinforcement treatment is conducted on surrounding stratums of an existing pile foundation and an existing bearing platform within the foundation pitengineering influence range through sleeve valve pipes; RJPs are constructed on the side, invading the enclosure structure, of the existing pile foundation; secant pile enclosure structures on the twosides of the existing pile foundation are constructed, and it is ensured that reinforced concrete piles are occluded with the RJPs; a soil body around the existing pile foundation is excavated, and anewly-added pile foundation and a newly-added bearing platform are constructed; and the site is restored, and other secant piles and foundation pit side walls are constructed. The construction of thefoundation pit enclosure structure can be completed under the condition of intrusion of the adjacent existing pile foundation, the stratum reinforcing strength requirement is met, the waterproof andstress problems are solved, the pile forming quality can be effectively guaranteed, disturbance to an existing building (structure) can be effectively reduced, and sedimentation and deviation of surrounding stratums and pipelines are effectively controlled.

The application relates to a tool for processing a motor casing, which comprises a base shaft, a fixed conical ring, a movable conical ring, a positioning driving piece, a pressure plate and a clamping driving part, the periphery of the fixed conical ring is used for abutting against the inner wall of one end with smaller diameter of a stator inner hole, and the periphery of the movable conical ring is used for abutting against the inner wall of one end with larger diameter of the stator inner hole; and the clamping driving part is used for driving the pressing disc to abut against the product, so that the inner hole wall of the stator abuts against the periphery of the fixed conical ring, and positioning and clamping are achieved. The axis of the stator coincides with the axis of the baseshaft, positioning and clamping of a product are completed, then positioning and clamping are completed with the axis of the inner hole of the stator as the reference, and the effect of accurate clamping is achieved.

The invention discloses a permanent magnet Halbach linear motor, which comprises a primary iron core, a primary winding, a secondary Halbach permanent magnet, and a secondary iron core. There is an air gap between the primary iron core and the secondary Halbach permanent magnet, and the primary winding is wound on the primary iron core. The primary winding passes three-phase current; it also includes an air gap compensation winding, the air gap compensation winding and the primary winding are wound on the primary iron core in parallel, and the air gap compensation winding is connected to the control circuit. The air gap compensation winding can perform d-axis compensation through the control circuit, so that it just offsets the influence of the armature current on the air gap, thereby effectively realizing suspension control and stabilizing the height of the air gap. Since the permanent magnet Halbach linear motor of the present invention adds an air gap compensating winding, it can easily realize air gap suspension control and stabilize the air gap height while generating strong suspension force and propulsion force.

The utility model relates to an oil-driven planetary gear train differential multi-rotor agricultural spraying aircraft, which relates to the technical field of agricultural unmanned aerial vehicles. The invention can realize the purposes of large load capacity, long flight time, good spraying operation quality, high operation efficiency, low operation cost, eliminating phytotoxicity caused by farmers spraying pesticides, and saving labor force. The engine is fixedly connected with the driving gear of the gear or belt transmission mechanism, and the driven gear of the gear or belt transmission mechanism is fixedly installed on the horizontal central shaft of the central bevel gear transmission box, and the horizontal central shaft and the two central outputs of the central bevel gear transmission box The shafts are fixed with the large sun gear of the planetary gear transmission mechanism, the small sun gear is connected with the rotor input shaft of the rotor bevel gear transmission box of the rotor transmission mechanism, and the two rotor output shafts of the rotor bevel gear transmission box are respectively fixed. The rotor and the worm wheel in the worm and gear transmission mechanism are fixedly connected with the planetary gear, and the worm is connected with the speed regulating motor through transmission. The invention is used in the fields of agricultural spraying operation, aerial inspection, air transportation and the like.

A paper-feeding offset corrector for aseptic beverage pouring machine is composed of fixed drum, offset correcting drum, machine frame, slide platform, slide block, and two bearing holders for fixed end and movable end.

The invention discloses a gluing station, which belongs to the gluing technical field. The invention provides the gluing station capable of accurately controlling the gluing position and length. The gluing station comprises a rotation lifting platform, and an annular loop similar with outer ring of a component to be glued and with reduced geometric ratio by 1 / 2 to 1 / 5, several support bars are arranged on a table board on the rotation lifting platform, a locating piece is arranged at top outboard of each support bar, a positioning foot coupled with the locating piece is arranged on the annular loop, two strips of annular channel sections with up and down arrangement and mutual parallel are arranged on annular loop along the outer sidewall of the annular loop, a length positioning annular lamp with slanting irradiation downwards is arranged in one of the annular channel section, an indication block is clamped and connected in the other annular channel section, one side of the indication block shields the length positioning light of the length positioning annular lamp; and the length of the indication block is coupled with the length of glue required by the component to be glued. The gluing station is mainly used in positioning and gluing technology.

The invention discloses a low-specific-gravity high-performance wall protection mud material for long horizontal freezing drilling in silty clay and a preparation method. The mud material is composed of basic components and externally mixed components. The control index of the mud material is: the water loss of the mud <15mL, mud specific gravity <1.05, mud viscosity 20s~50s. The preparation method comprises the following steps: (1) determining the control index, (2) screening the basic formula, (3) testing and testing, (4) orthogonal testing, (5) testing and checking, (6) determining the basic component and the externally mixed group The distribution ratio. The wall protection mud material of the present invention forms a mud cake at the interface between soft and hard formations, which well supports the stability of the borehole wall, and controls the offset of the interface between soft and hard formations to keep it within 3‰. After the drill pipe is pulled out, the mud, mud cake, air and the borehole form an underpressure balance system in the borehole. This balance system can maintain stability for a long time, maintaining the stability of the borehole for more than 9 hours, and realizing the smooth release of the frozen pipe.

The invention discloses an oil-driven differential-speed-type multi-rotor agricultural spraying aircraft of engine central transmission, and relates to the technical field of agricultural-utilization unmanned aerial vehicles. The oil-driven differential-speed-type multi-rotor agricultural spraying aircraft of engine central transmission can achieve the purposes that the loading capacity is large, the flight time is long, the quality of spraying operation is good, the operational efficiency is high, the operational cost is low, the chemical injury brought by chemicals spraying by farmers is relieved, and the labor force is saved. An engine is fixedly connected with a central driving bevel gear of a central bevel-gear transmission case, a central driven bevel gear is fixedly installed on a horizontal center shaft of the central bevel-gear transmission case, and first bevel gears of a bevel-gear differential-motion transmission case are fixedly installed at the horizontal center shaft and two central output shafts correspondingly; and a second bevel gear is in transmission connection with a rotor input shaft of a rotor bevel-gear transmission case of a rotor transmission mechanism, rotors are fixedly installed at two rotor output shafts of the rotor bevel-gear transmission case correspondingly, a worm wheel in a worm wheel and worm transmission mechanism is rotatably installed at the rotor input shaft, and a worm is in transmission connection with an adjustable-speed motor. The oil-driven differential-speed-type multi-rotor agricultural spraying aircraft of engine central transmission is used in the fields of agricultural spraying operation, air patrol, air transportation and the like.

The invention particularly discloses a power transformation framework. The power transformation framework comprises a supporting assembly, a middle cross beam and a connecting cross beam, wherein thesupporting assembly comprises a first supporting piece and a second supporting piece which are arranged at an interval in the first direction; the middle cross beam is arranged between the first supporting piece and the second supporting piece, and comprises a first end and a second end which are opposite in the first direction; and the connecting cross beam comprises a first connecting part and asecond connecting part, the first connecting part is connected with the first end and the first supporting piece, and the second connecting part is connected with the second end and the second supporting piece. Moreover, the space between the first connecting part and the second supporting piece forms a triangular pyramid with the first end as the vertex, and the space between the second connecting part and the second supporting piece forms a triangular pyramid with the second end as the vertex. Therefore, the space of the triangular pyramids is more stable, meanwhile, the specification of the power transformation framework is further miniaturized, and thus the manufacturing cost is reduced.

This application relates to a tooling for machining conical motor casings, which includes a base shaft, a fixed cone ring, a moving cone ring, a positioning drive, a pressure plate, and a clamping drive. The outer circumference of the fixed cone is used to abut against the inside of the stator The inner wall of the end with the smaller hole diameter, the outer circumference of the moving cone ring is used to abut against the inner wall of the larger end of the stator inner hole; and the clamping driver is used to drive the pressure plate against the product, so that the inner hole wall of the stator is pressed against the fixed cone The outer circumference of the ring to achieve positioning and clamping. In this application, the axis of the stator coincides with the axis of the base shaft to complete the positioning and clamping of the product, and then complete the positioning and clamping based on the axis of the inner hole of the stator to achieve the effect of precise clamping.

The invention relates to a high-performance radial tire intelligent vulcanizing machine. The machine comprises a frame, a tire assembly mechanical arm, a pressurization mechanism, a vulcanizing chamber and a mould opening and closing mechanism, a central mechanism, a segmented mold drive device, an intermediate mechanical arm, a two-station four-point type rear inflation device, a tire detachment mechanical arm and a connecting roller way, wherein the frame is of a frame type integrated structure; and a lifting mechanism of the mould opening and closing mechanism adopts roller locking guidance, and a tire storage mechanism is arranged at the front end of the frame. The high-performance radial tire intelligent vulcanizing machine is of the frame type integrated structure, and a cylindrical insulator can be used for realizing pressure transfer, hydraulic and pneumatic pressure transmission and electrical signal control, so that the high automatic dual-mould vulcanizing machine integrated with machine, electricity, hydraulic pressure and pneumatic pressure can be realized. Steam and nitrogen are adopted as vulcanizing media, so that the vulcanizing efficiency and vulcanizing quality of a tire are greatly improved.

The invention discloses a semi-conductor structure and a forming method thereof. Shallow channel isolation is processed in an ultraviolet irradiating method, so that the concentration of free oxygen in the shallow channel isolation is greatly reduced, a blocking layer is formed, diffusion of the free oxygen is further prevented, a high K dielectric layer cannot be eroded by the free oxygen, large leak currents are avoided, shift of a threshold voltage Vt can be effectively controlled, and performance of a component is improved.

The invention provides an antenna structure of a mobile terminal with a metal shell. The antenna structure comprises a main antenna, the metal shell and a tuning switch; the main antenna comprises a first feeding point, a first earth point, a first feeding short branch, a second feeding long branch and a first earth branch; one end of the first feeding short branch is connected with the first feeding point, and the other end of the first feeding short branch is connected with one end of the second feeding long branch; the other end of the second feeding long branch is connected with the metal shell; one end of the first earth branch is connected with the first earth point through the tuning switch, and the other end of the first earth branch is connected with the metal shell. According to the mobile terminal with the metal shell and the antenna structure thereof, the main antenna can provide a low-frequency bandwidth ranging from 880 MHz to 960 MHz and a high-frequency bandwidth ranging from 1,710 MHz to 2,690 MHz; a low-frequency resonance can be switched through the tuning switch arranged on the earth end of the main antenna, expanding of the low-frequency bandwidth is achieved, and it is guaranteed that the range of the working frequency applied to the antenna with the metal shell reaches the coverage area of an LTE frequency band of 4G.