45 results about "Fifth power" patented technology

The embodiment of the invention discloses a mobile terminal radio frequency front-end comprising a first main antenna, a diversity antenna, a second main antenna, a quadruplexer, a first filter, a second filter, a third filter, a fourth filter, a fifth filter, a sixth filter, a seventh filter, an eighth filter, a first power amplifier, a second power amplifier, a third power amplifier, a fourth power amplifier, a fifth power amplifier, a sixth power amplifier, a quadruplexer, a duplexer, a first radio frequency switch, a second radio frequency switch, a first RF transceiver, a second RF transceiver and a controller. The embodiment of the invention also discloses a mobile terminal. With application of the mobile terminal radio frequency front-end and the mobile terminal, the number of the antennas in the internal part of the mobile terminal can be reduced, and internal interference and complexity of the antenna design can be reduced.

The invention discloses a switching-loss-free full-bridge non-isolated photovoltaic grid-connected inverter and an on-off control timing sequence. The inverter comprises a voltage division capacitance branch, a high-frequency main switching unit, a resonant network and a low-frequency change-over switch unit. Two sets of zero-current switching branches composed of the resonant network composed of full control switches, resonant capacitors and resonant inductors and auxiliary follow current clamping diodes are added, the on-off control timing sequence is matched, the zero-current turning-on and zero-current turning-off conditions of a fifth power switch tube S5 and a sixth power switch tube S6 can be achieved, the zero-current turning-on and zero-current turning-off conditions of a fifth auxiliary power switch tube Sa5 and a sixth auxiliary power switch tube Sa6 can be achieved, the reverse restoration of low-frequency change-over switch unit diodes D1-D4 can be eliminated, it is guaranteed that the common-mode voltage of the inverter is constantly one second of a battery voltage in the power transmission process, the resonance period and the follow current stage to eliminate leak currents, and therefore high frequency and minimization of the non-isolated photovoltaic grid-connected inverter can be achieved.

The invention relates to a T-shaped active clamping type five-level three-phase inverter. The T-shaped active clamping type five-level three-phase inverter comprises three same T-shaped active clamping type five-level bridge arms, wherein each T-shaped active clamping type five-level bridge arm comprises a first circuit, a second circuit, a third circuit and a clamping capacitor, the first circuit comprises a first power electronic switch tube, a second power electronic switch tube, a third power electronic switch tube and a fourth power electronic switch tube which are connected in series, a first connection point, a second connection point and a third connection point are contained in the first circuit, the second circuit comprises a fifth power electronic switch tube and a sixth power electronic switch tube which are connected in series, the third circuit comprises a seventh power electronic switch tube and an eighth power electronic switch tube which are connected in series, the clamping capacitor is connected between the first connection point and the third connection point, and the second connection point is an output end. By the T-shaped active clamping type five-level three-phase inverter, the input voltage range of the inverter can be expanded, and the performance of the inverter is improved.

The invention provides a non-programming electronic cam curve generating method for transection. The method comprises: differential processing is carried out based on fifth-power non-dimensionalized position relation function to obtain a speed function, an acceleration function, an accelerated acceleration function; according to different cutting lengths, equation coefficients are calculated by selecting different conditions; conversion between a non-dimensionalized value and a true value is carried out on the functions; and then coordinate offset processing is carried out to obtain piecewise functions. According to the invention, an electronic cam curve can be generated only by setting three parameters: a parameter knife perimeter, a total synchronzi9ation length, and a cutting length; and generation of a reverse speed of a driven shaft is avoided based on calculation. For the electronic cam curve generated by using the method in the transection field, the operation and debugging of the filed operator can be simplified; programming is avoided; and the reliability is high. The speed curve is a fourth-power function that is more flexible and smoother by compared with a third-power function.

The invention discloses a single-phase online inverter with a switchable topology, relates to the technical field of conversion of electrical energy, and solves the problem that the working efficiency of inverters is influenced due to the fact that the structure of a conventional inverter with a fixed topology is complicated and loss of a power device is serious. According the inverter, a first power switch S11, a first diode D11, a third power switch S13, a third diode D13, a fourth power switch S14, a fourth diode D14, a second power switch S12 and a second diode D12 constitute an H bridge; a fifth power switch S21, a fifth diode D21, a seventh power switch S23, a seventh diode D23, an eighth power switch S24, an eighth diode D24, a sixth power switch S22 and a sixth power switch D22 constitute the other H bridge; and a power output end of the fourth power switch S14 is connected with a power input end of a bilateral switch S3, a power output end of the eighth power switch S24 is connected with a power output end of the bilateral switch S3, a power output end of the third power switch S13 is connected with a power output end of the fifth power switch S21, and a first direct-current power supply Udc1 and a second direct-current power supply Udc2 are connected to outer sides of the two H bridges respectively. The single-phase online inverter is applicable to conversion of electrical energy.

The invention discloses a low voltage wide input push-pull forward three-level direct current convertor and a method for controlling the convertor, which belong to direct current convertors and methods for controlling the convertors. The convertor of the invention is composed of an input dividing capacitance circuit, a first level branch, a second level branch, a third level branch, a clamping capacitor, an insulating transformer, a rectifier bridge and a filter circuit. The method for controlling the convertor of the invention comprises: driving signals of a first power switch tube and a fifth power switch tube are complementary, the driving signals of a fourth power switch tube and a sixth power switch tube are complementary, two working modes of three levels and two levels exist, in the three level working mode, a second power switch tube and a third power switch tube are conducted complementarily for 180 degrees, the first power switch tube and the fourth power switch are modulated by PWM, in two level working mode, the first power switch tube and the fourth power switch tube are cut normally, the fifth power switch tube and the sixth power switch tube are conducted normally, and the second power switch tube and the third power switch tube work by PWM. The invention reduces the conducting loss, improves the conversion efficiency, and saves a flying capacitor.

The invention discloses an inverse-excitation type single-stage inverter used in an interconnected photovoltaic power generation system, including an input side circuit, an inverse-excitation transformer and an outlet side circuit, wherein, the input side circuit includes a photovoltaic array, a first filtering capacitance and a first power switch tube, which are connected to the primary side of the transformer; and the outlet side circuit includes a second to fifth power switch tube and a second filtering capacitance, which are connected to the secondary side of the transformer. The invention has the following advantages that the single-stage structure not only realizes voltage boosting inversion output, but also reduces the size, volume weight and cost of the complete machine; high-frequency electric insulation is realized; the entire circuit has no other magnetic components except the high-frequency inverse-excitation transformer, the entire circuit uses less power devices with simple structure and small spending; and the control scheme is more simple and is easy of implementing.

The embodiment of the invention discloses a wiring device of a simulation test system, and the device comprises: a signal source, a frequency spectrograph, a first attenuator, a second attenuator, a third attenuator, a forth attenuator, a fifth attenuator, a sixth attenuator, a seventh attenuator, an eighth attenuator, a ninth attenuator, a tenth attenuator, a first power divider, a second power divider, a third power divider, a fourth power divider, a fifth power divider, a sixth power divider, a seventh power divider, a resistance plate, a concentrator communication unit base plate and an ammeter carrier communication unit base plate; the concentrator communication unit base plate and the ammeter carrier communication unit base plate are respectively connected with a concentrator communication unit and an ammeter communication unit, and technical problems that a test mode of one concentrator connecting with a plurality of ammeters only can form a simple network topology structure, can not test the route performance of a carrier communication module in a multi-level route environment and is insufficient to manage and test the network of the communication module are solved.

The invention relates to a single-stage low-switch-stress and low-output-ripple LED drive circuit comprising an input alternating-current power supply uin, a diode rectifier bridge BD1, a main transformer Tr1, an auxiliary transformer Tr2, a first power MOS switch tube S1, a second power MOS switch tube S2, a first power diode D1, a second power diode D2, a third power diode D3, a fourth power diode D4, a fifth power diode D5, a sixth power diode D6, an electrolytic capacitor C1, a first output capacitor Co1, a second output capacitor Co2, an output filter inductor Lf, and an LED lamp load. The LED drive circuit based on combination of a single-stage AC-DC converter Flyback and an auxiliary converter Forward is constructed, so that high-efficiency, low-voltage-stress, low-output-ripple, and constant current output functions are realized.

The invention discloses an island-undercurrent underwater power generation device. The island-undercurrent underwater power generation device comprises a shell, a first power generator, a first gear, a first chain, a first wheel carrier, a first inlet, a second gear, a first propeller, a sliding block, a sliding rail, a first floating board, a first hydraulic cylinder, a first rolling wheel, a second belt, a sixth power generator, a supporting frame, a fourth power generator, a first propeller blade, a rack, an outlet, a first spring, a second floating board, a first flywheel, a second flywheel, a third belt, a connecting block, a third wheel carrier, a second rolling wheel, a third power generator, a second spring, a second propeller blade, a pulling cord, a fifth power generator, a supporting plate, a second hydraulic cylinder, a second inlet, a second power generator and a second wheel carrier; the shell is arranged on a shaft of the sixth power generator; the shaft of the sixth power generator is arranged on the supporting frame; the first inlet is formed in the shell; the first wheel carrier is arranged on the shell; the first wheel carrier is located on the front of the first inlet; and the first wheel carrier is provided with the first propeller. The island-undercurrent underwater power generation device has the advantage that various forms of undercurrent energy can be utilized.

The invention discloses a power topological structure controlling three switch reluctance motors at the same time. The power topological structure comprises a direct-current power source, the three three-phase switch reluctance motors, a power filter capacitor and 12 power switch tubes. The power filter capacitor is connected with the two electrodes of the direct-current power source in parallel. The positive electrode of the direct-current power source is connected with the collector electrodes of the first power switch tube, the second power switch tube, the third power switch tube, the fourth power switch tube, the fifth power switch tube and the sixth power switch tube at the same time. The negative electrode of the direct-current power source is connected with the emitting electrodes of the seventh power switch tube, the eighth power switch tube, the ninth power switch tube, the tenth power switch tube, the eleventh power switch tube and the twelfth power switch tube at the same time. Through connection of windings of the motors, the three switch reluctance motors are controlled through switching-on and switching-off of a switch, and the idle motor or the faulty motor can be switched off. The problems that an existing switch reluctance motor drive power structure is complicated and high in cost, on some occasions, one or more motors are idler, the utilization rate of a power converter is low, and the work efficiency of a system is low are solved.

The invention discloses a single-stage inverter. The single-stage inverter comprises an input power source Uin, a first switch A, a second switch B, a first power switch tube S1, a second power switch tube S2, a third power switch tube S3, a fourth power switch tube S4, a fifth power switch tube S5, a sixth power switch tube S6, a first diode D1, a second diode D2 and an energy storage capacitor C. A passive component capacitor serves as an energy exchanging component. According to the novel single-stage inverter structure, the circuit working area is reasonably divided, the input power source energy consumption can be reduced, the service life of the input power source can be prolonged, and the single-stage inverter can be widely applied to the fields of photovoltaic grid-connected inverters, hybrid electric vehicles and the like.

The invention provides an unknown goaf waterlogged area detection method based on direct-current detection and belongs to the field of mine detection. The method comprises arranging power supply electrodes and a measuring instrument in an excavation roadway, wherein the power supply electrodes are electrically connected to a controller arranged inside the measuring instrument; sequentially selecting the first power supply electrode and the sixth power supply electrode, the second power supply electrode and the seventh power supply electrode, the third power supply electrode and the eighth power supply electrode, the fourth power supply electrode and the ninth power supply electrode as well as the fifth power supply electrode and the tenth power supply electrode as measuring objects respectively, carrying out measurement and recording data, and summarizing the measured data recorded by the controller; and calculating resistivity and analyzing change of the resistivity and distribution information of unknown goaf waterlogged areas. The method is wide in effective detection range, high in accuracy, flexible and simple to use, and little in labor amount of measuring personnel.

The invention relates to a six-power support roller profile curve, and belongs to the technical field of steel strip production equipment in the metallurgical industry. According to the technical scheme, the equation of the support roller profile curve is f(x)=p1*x^6+p2*x^5+p3*x^4+p4*x^3+p5*x^2+p6*x+p7, wherein x is the support roller body length coordinate, p1, p2, p3, p4, p5 and p6 are coefficients of the sixth power, the fifth power, the fourth power, the third power, the second power and the first power of the equation correspondingly, p7 is the constant term of the equation, and E is thescientific counting method; and the support roller profile curve is ground by a numerically-controlled grinding machine. The six-power support roller profile curve has the beneficial effects that thefinished strip steel plate type can be improved, and the sentence reduction rate of the plate type is reduced from 4.63% to 0.06%. The six-power support roller profile curve is a one-time grinding curve, chamfers on the two sides of a support roller do not need to be separately ground, and the grinding efficiency of the support roller is improved.

A transmitter and method are provided for processing a transmission signal. The transmitter includes an FEM that switches a plurality of band signals for a first and second communication scheme, wherein the band signals for the first communication scheme include a first HB signal, a second HB signal, a first LB signal, and a second LB signal, and the band signals for the second communication scheme include a third LB and a third HB signal; a first PAM including a first power amplifier that amplifies the third HB signal, a second power amplifier that amplifies the first HB signal, and a third power amplifier that amplifies the first LB signal; and a second PAM including a fourth power amplifier that amplifies the third LB signal, a fifth power amplifier that amplifies the second HB signal, and a sixth power amplifier that amplifies the second LB signal.

A Fermat's grand theorem demonstration model is disclosed and relates to the field of teaching of mathematics in primary, secondary and tertiary schools and the field of scientific research. The invention is aimed at constructing a mathematical model for Fermat's grand theorem and solving two problems of mathematics teaching and popularization of science; the demonstration model consists of a number of rectangular square (1), a number of universal Integrated circuit boards (2), a number of positive Integer nth power formula plates (3), a number of touch screen switch cover plates, a third power display panel (5), a fourth power display panel (6), a fifth power display panel (7), a sixth power display panel (8), a seventh power display panel (9), an eighth power display panel ( 10), a ninthpower display panel (11), an nth power universal display panel (12), an nth power variant four-color display panel (13) and a base seat (14); the third power display panel (5), the fourth power display panel (6), the fifth power display panel (7), the sixth power display panel (8), the seventh power display panel (9), the eighth power display panel (10), the ninth power display panel (11), the nth power universal display panel (12), the nth power variant four-color display panel (13) and the base seat (14) are made via via a Fermat inequality parameter method and an assembly display panel method; all display panels are orderly inserted horizontally into opposite grooves of inner sides of wall panels erected before and after the base seat (14); different colors of the rectangular squares on the display panels or lights of electric lights in an integrated circuit are used to show Fermat inequalities and demonstrate that Fermat's grand theorem is true, and the positive integer n is greater than or equal to 3.

The invention provides a constant-voltage and constant-current dual-mode BUCK type direct-current power circuit on the basis of compensation topology. The constant-voltage and constant-current dual-mode BUCK type direct-current power circuit comprises a first capacitor, a second capacitor, a first resistor, a second resistor, an inductor, a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a first power electronic switch device, a second power electronic switch device, a third power electronic switch device, a fourth power electronic switch device, a fifth power electronic switch device, a first current sensor, a second current sensor, a voltage sensor, a first input wiring terminal, a second input wiring terminal, a third input wiring terminal and a fourth input wiring terminal. The constant-voltage and constant-current dual-mode BUCK type direct-current power circuit has the advantages that the problems that most traditional BUCK type direct-current power sources only can work in constant-voltage modes, are long in dynamic regulation time under the condition of sudden change of load, are high in voltage fluctuation amplitude in the constant-voltage modes and are high in current fluctuation amplitude in constant-current modes can be solved; voltages can be reduced on the premise that currents of input direct-current voltages are basically stable, stable direct-current voltages can be provided for load in constant-voltage modes by topological structures of a direct-current power main circuit and corresponding control strategies, and stable direct currents can be provided for the load in constant-current modes by the topological structures of the direct-current power main circuit and the corresponding control strategies.