418results about How to "Large power capacity" patented technology

A switching regulator is provided herein comprising a voltage source, a plurality of switching elements, an inductive element, and a controller. The controller coordinates the plurality of switching elements as to sequentially and periodically switching the inductive element to generate a plurality of regulated DC voltages. The controller adjusts a switching frequency of the regulator in accordance with at least one characteristic of a load current.

A method and apparatus for communications between an information processing device and an external device, such as a personal digital assistance (PDA), via impulse radio wireless communications techniques and a method for controlling the same. The information processing apparatus can periodically accesses a predetermined server machine (e.g., a Web server) to acquire a desired file (e.g., an HTML file). The information processing apparatus attempts to continually perform caching of the most recent downloaded data. As a result, when the PDA, as an external device, is set into impulse radio communication mode and a user simply holds the PDA to a predetermined discoverable region of the information processing apparatus, a connection between them is established, thereby enabling the PDA to receive the most recent downloaded data.

The invention relates to the technical field of microwave filters or duplexers, in particular to a one-cavity three-mode filter based on the one-cavity three-mode technology. The one-cavity three-mode filter is characterized by at least comprising a cubic rectangular waveguide resonant cavity, three modes of TE101, TE011 and TE110 are arranged in the cubic rectangular waveguide resonant cavity and have the same resonance frequency, a non-conductive medium material is filled in the chamber of the cubic rectangular waveguide resonant cavity with six conductive surfaces, and the side length is square root of one half of the wavelength when the mid frequency is in the medium material. The one-cavity three-mode filter has the advantages of small size and low manufacturing cost.

The invention discloses a space positioning platform which comprises an X-direction guide rail, a Y-direction guide rail driven by an X-direction driving mechanism to be in linear reciprocating motion along the X-direction guide rail, a Z-direction guide rail driven by a Y-direction driving mechanism to be in linear reciprocating motion along the Y-direction guide rail, and a carrying platform driven by a Z-direction driving mechanism to be in up-down reciprocating motion along the Z-direction guide rail. The Y-direction guide rail is mounted on the X-direction guide rail , the Z-direction guide rail is mounted on the Y-direction guide rail, the carrying platform is mounted on the Z-direction guide rail, and the X-direction driving mechanism, the Y-direction driving mechanism and the Z-direction driving mechanism form a servo driving system for adjusting position of the carrying platform in directions X-axis, Y-axis and Z-axis of a space rectangular coordinate system. The space positioning platform is simple in structure, reasonable in design, simple and convenient to use and operate, good in using effect and high in positioning efficiency, and the problem that an existing lifting device is single in moving direction, inaccurate in positioning, poor in reliability and the like can be effectively solved.

An interactive safety helmet for a bicyclist, making it possible for a group of bicyclists wearing like helmets to communicate with each other and thereby coordinate their activities. The helmet is formed by an outer shell shaped to fit onto the head of the bicyclist and an inner cushioning liner having a pair of miniature loud speakers embedded therein at opposing sides adjacent the ears of the bicyclist. Extending from the shell is a gooseneck supporting a microphone at a position adjacent the mouth of the bicyclist. Mounted on the shell is a miniature radio transceiver whose transmitter section is coupled to the microphone and whose receiver section is coupled to the loud speakers. The transceiver is connected by a line extending from the helmet to an external battery power pack. In operation, a bicyclist wearing the helmet can by talking into the microphone and listening to the loud speakers interact with other bicyclists in the group. The helmet is also provided on either side thereof with an LED safety flashing light powered by the same power pack.

A surface cleaning apparatus comprises an air flow path extending from a dirty air inlet to a clean air outlet and includes a suction motor. The surface cleaning apparatus may be battery powered and/or may have a power requirement of 200 Watts or less. A cyclone chamber is provided in the air flow path and has an air outlet which is covered by a screen. In one embodiment, there is an absence of a vortex finder. In another embodiment, a vortex finder that extends into the cyclone chamber less than the height of the cyclone inlet and optionally less than the height of the cyclone inlet may be provided.

The invention discloses a dual frequency multiplexer by which a first and second coaxial harmonic oscillator type band pass filters are disposed in a box. The box includes a base body, a cover plate and a cover body. The two coaxial harmonic oscillator type hand pass filters are located on the base body and spaced each other by a metal plate; the multiplexer port, first and second ports are positioned on lateral side of the base body. The blocking capacitors are contained in the coaxial chamber of the two coaxial harmonic oscillator type band pass filters. The cover plate is secured on the base body; the first and second direct current circuits are placed on the cover plate; the low pass filters of the first and second direct current circuits are fixed on an edge of a top surface of the coaxial chamber by means of a support member; the cover body and the base body are fastened with each other. The blocking capacitors each are of distributed parameter capacitor. Utilization of distributed blocking capacitors makes the product of the invention small. Moreover, improvement of the structure of the invention brings effect such as less differential loss, large power capacity, as well as high isolation degree between circuits.

The invention discloses an ultrasonic vibration atomizer which comprises a liquid delivery pipeline, a bolt, a rear cover plate, a piezoelectric ceramic wafer, an electrode piece, an amplitude changing rod and a mesh vibration plate. The rear cover plate, the piezoelectric ceramic wafer, the electrode piece and the amplitude changing rod are sequentially sleeved on the bolt and connected and clamped through the bolt, the liquid delivery pipeline is connected at the rear end of the bolt, and the mesh vibration plate is arranged at the front end of the amplitude changing rod. An energy converter is of a sandwich type structure, and the ultrasonic vibration atomizer has the advantages of large power capacity, tiny and uniform in fogdrop after atomizing, effective in liquid medium atomizing, easy to control atomizing amount and the like.

The invention provides an impact performance simulation test method and a device for a grounding body with a large simulated size and a large amplitude value. The impact performance simulation test device for the grounding body with the large simulated size and the large amplitude value comprises a simulated grounding body, four impulse current generator which are symmetrically arranged in a distributive mode, a matching charging loop, four discharging loops, a circular-ring-shaped backflow electrode, a group of wave modulation inductor and wave modulation resistor and a coaxial cylinder type current divider. The impact performance simulation test device for the grounding body with the large simulated size and the large amplitude value is characterized in that the simulated grounding body which is arranged in the center of an impact field is embedded underground; the four impact current generators are symmetrically arranged on the periphery of the impact field; output ends of the impact current generators are connected to a high frame which is arranged in the center of the impact filed through four overhead aluminum pipes to perform confluence and then are connected to the simulated grounding body through the wave modulation resistance, the wave modulation inductance and the coaxial cylinder type current divider. The impact performance simulation test device for the grounding body with the large simulated size and the large amplitude value has the advantages of satisfying simulation test of the large-sized grounding body under the impact current with the large amplitude value which is similar to real thunders, being convenient to operate, large in power capacity, high in amplitude value of the output impact current, multiple in wave shape, flexible and multiple in adaption and the like.

The invention belonging to the field of the millimeter wave technology discloses a millimeter-wave broadband ridged probe radial waveguide power divider/combiner. The radial waveguide power divider/combiner comprises a coaxial input waveguide, a transition structure, a radial waveguide, and an N-path ridged probe coupled output array. According to the invention, with the broadband low-reflection transition structure for the coaxial waveguide to the radial waveguide, a matched circular ring structure, and the power distribution mode of the ridge probe, the working bandwidth of the power divider/combiner is increased; the radial waveguide power divider completes power distribution by one-time operation, so that the path losses of the power distribution is reduced; and because of the circumferential symmetry of the structure and the radial waveguide working mode, the amplitude-phase consistency of all paths of signals after distribution is guaranteed, so that the high power synthesis efficiency of the power combiner is realized.

The invention relates to a microwave heating device adopting phase scanning. The device comprises a microwave generator, a waveguide power divider, a waveguide phase shifter, a microwave application cavity, no less than two pairs of microwave antennas and a phase scanning control system; the waveguide power divider has N (N is larger than or equal to two) routes of output, at least one route of output is connected with the waveguide phase shifter; the microwave antennas are divided into N groups, at least one group of input is connected with the output of the waveguide phase shifter, and the input of the other groups of antennas are directly connected with the output of the waveguide power divider; the phase difference between an input port of the waveguide phase shifter and an output portof the waveguide phase shifter is continuously adjustable; the phase scanning control system adjusts a phase shift angle of the waveguide phase shifter at a given speed; by scanning the phase difference among different groups of antennas, the movement of microwave strong field and weak field regions in a microwave application cavity is achieved, and the heating uniformity is improved; the microwave heating device adopting the phase scanning has large power capacity, and is suitable for industrial microwave large-scale production application.

The invention discloses a liquid crystal electrical control zero-crossing scanning leaky wave antenna based on comb-line waveguide, which belongs to the technical field of microwave antenna construction. The problems that a conventional electrical control scanning leaky wave antenna based on a varactor and other traditional electric tuning elements difficultly works in a microwave high frequency band and the existing liquid crystal electrical control fixed-frequency scanning leaky wave antenna is difficult to realize zero-crossing scanning and requires a bias circuit which is specially designed are solved. The antenna provided by the invention comprises a top dielectric plate layer, a metal layer, a liquid crystal layer and a bottom waveguide groove. The metal layer is arranged between the top dielectric plate layer and the bottom waveguide groove. A longitudinal groove structure is arranged on the upper surface of a rectangular plate to form the bottom waveguide groove. The metal layer is in a comb-line structure. N periodic slit units are arranged between two columns of comb teeth on the comb-line structure. N periodic slit units comprise two groups of vertical slit columns and a group of transverse slit column. Through periodic transverse slits, the equivalent series inductance of electromagnetic waves spreading between the bottom waveguide groove and the metal layer is increased. Through periodic vertical slits, the equivalent parallel capacitance is increased.

The invention discloses an inverter parallel-connection loop current restraining system based on PR control and dual-carrier modulation. By means of the inverter parallel-connection mode, the power capacity of an inverter system is increased. Meanwhile, a proportion resonance control device is adopted in an inverter, and therefore low-frequency zero-sequence loop currents can be effectively restrained; the dual-carrier modulation method is used, a zero vector is replaced by a non-zero vector so that the high-frequency zero-sequence loop currents can be restrained. The restraining system has the advantages of being high in direct-current voltage utilization rate and small in zero-sequence loop current.

The invention relates to the technical field of communication and in particular discloses a compact type ultra wide band polarizer. The compact type ultra wide band polarizer comprises a circular waveguide port, a transition chamfer square waveguide and an ultra wide band phase shifter, wherein the circular waveguide port is connected with the ultra wide band phase shifter by virtue of the transition chamfer square waveguide, the circular waveguide port is arranged at the two ends, one end is an input circular waveguide port, and the other end is an output circular waveguide port; the transition chamfer square waveguide is a square waveguide with four ridges chamfers; and the ultra wide band phase shifter is a square waveguide the side wall of which is provided with a horizontal ridge and a vertical ridge, and the horizontal ridge is symmetrically distributed on the two opposite side walls of the square waveguide along the axial direction of the square waveguide. In the invention, a simple and compact structure is adopted, linear circular polarization on two direction field vectors are smartly realized, technical indexes of amplitude and phase for a circular polarizer to be orthogonal with two field components are met, and the compact type ultra wide band polarizer disclosed by the invention has the advantages of compact structure, small volume, light weight, low cost, easiness in processing, easiness in tuning, high efficiency, high power capacity and the like.

The invention provides a novel single-excitation ultrasound oval vibration turning device. The single-excitation ultrasound oval vibration turning device comprises a shell unit, an ultrasonic vibration transducer arranged in the shell unit, an oval vibration mode converter and a cutter arranged at the front end of the oval vibration mode converter. The shell unit comprises an outer sleeve, a top plate and a bottom plate, wherein a supporting plate is connected with the outer sleeve in a welding mode or through screws and used for being connected with a lathe cutter rest. The ultrasonic vibration transducer is cylindrical overall and comprises an upper covering plate, a piezoelectric ceramic piece, an electrode piece and a lower covering plate, wherein the electrode piece is connected with an ultrasonic power source, the upper covering plate, the piezoelectric ceramic piece, the electrode piece and the lower covering plate are pressed tightly through bolts to form an energy conversion part of the ultrasonic vibration transducer, ultrasonic electric signals output by the ultrasonic power source are converted into longitudinal ultrasonic vibration of the ultrasonic vibration transducer, and the upper surface of the upper covering plate is connected with the oval vibration mode converter.

The invention belongs to the technical field of microwaves and millimeter waves and provides a dual-mode reconfigurable filter based on a half-mode substrate integrated waveguide and a CSR structure,mainly to solve the problems that an ordinary tunable filter has large insertion loss and bias voltage of a PIN diode can not be directly added to the substrate integrated waveguide. The half-mode substrate integrated waveguide technology is adopted, an upper metal pattern layer comprises a half-mode substrate integrated waveguide copper clad layer, a DC bias circuit, an epsilon-type microstrip line and other structures. Two complementary circular spiral resonators (CSR) are arranged at two sides of the copper clad layer, through applying forward/reverse bias voltage, the PIN diode is conducted or cut off, the upper metal copper and the epsilon-type microstrip line are conducted or cut off, and finally, single dual passband switching is realized. The reconfigurable filter under the features is particularly suitable for a wireless communication system, and has the advantages of small size, low insertion loss, multiple transmission zero points, high out-of-band suppression, convenient DCfeed loading, quick tuning speed, convenient tuning and the like.