57results about How to "Solve the large power loss" patented technology

The invention discloses a control method for the maximum power point tracking (MPPT) of a photovoltaic power system. For the control method, on the basis of the traditional MPPT method, a judgement basis for the output characteristic change of the photovoltaic array is added, and a control strategy for the MPPT after the output characteristic change is improved. When the output characteristics of the photovoltaic array are remarkably changed due to a shadow or an assembly fault and the like, an operation point (U, I) on the I-U output characteristic curve of the photovoltaic array is rapidly adjusted to a straight line for connecting the origin of coordinates with a point (Uoc, Isc), and then tracking is performed to the maximum power point of the photovoltaic array starting from the operation point by using the traditional MPPT method. With the adoption of the control method for the MPPT of the photovoltaic power system disclosed by the invention, tracking can be rapidly and accurately performed to a global maximum power point on a multimodal output P-U characteristic curve of the photovoltaic array, and the fluctuation on the output power of the photovoltaic array due to the MPPT method during the tracking process is slight, so that the control method for the MPPT of the photovoltaic power system is good in application prospect.

The invention discloses a high-performance rectifier diode replaced circuit which comprises a capacitor, a low-voltage clock generator, a charge pump circuit, a band-gap reference circuit, a hysteresis comparator, a driving amplifier and a power metal oxide semiconductor (MOS) pipe and is characterized in that the low-voltage clock generator detects voltages at two ends of a diode pipe and generates clock signals to drive the charge pump circuit; the charge pump circuit detects the voltages at two ends of the diode pipe and stores the charges in the capacitor after the charges are amplified; the voltage stored on the capacitor and the standard voltage output by the band-gap reference circuit are respectively output to the hysteresis comparator for comparison; and when the voltage stored in the capacitor is larger than the standard voltage output by the band-gap reference circuit, the hysteresis comparator outputs starting signals which are amplified by the driving amplifier and then output to the power MOS pipe to drive the power MOS pipe to be conducted. The high-performance rectifier diode replaced circuit can achieve equivalent diode working characteristics through a pulse working mode and can totally replace original selective beacon radar (SBR) devices in performance and dimension.

The invention discloses a tapered bearingless asynchronous motor. A left tapered bearingless asynchronous motor and a right tapered bearingless asynchronous motor which are identical to each other and respectively arranged at the left end and the right end of a motor casing are symmetrically connected to a mechanical rotating shaft; the left tapered bearingless asynchronous motor, as well as the right tapered bearingless asynchronous motor, consists of a tapered stator, a torque control winding, a levitation force control winding and a tapered rotor; the tapered rotors are fixedly connected with the mechanical rotating shaft; a plurality of stator slots are axially formed on each tapered stator; each stator slot is provided with an inner layer and an outer layer in the radial direction, and the levitation force control winding and the torque control winding are respectively arranged in the inner layer and the outer layer; and the difference between the number of pole-pairs of the levitation force control windings and the number of pole-pairs of the torque control windings is 1. The tapered bearingless asynchronous motor dispenses with magnetic levitation bearings indispensable for a traditional five-degree-of-freedom bearingless asynchronous motor, and has the advantages of simple structure, short axial length, high critical rotational speed, small reactive loss and the like.

The invention discloses resonance voltage resistant test system and voltage resistant test method of a sample with large capacitance. A series compensation electric reactor group is dispersively distributed to form a mixed series and parallel connection structure so as to trend to a distribution parameter. The invention overcomes the defect of concentrated distribution of compensating inductances in the conventional series resonance voltage resistant method, enables a frequency converting power supply and a boosting transformer to just provide less power consumption, greatly improves the loading capacity of a frequency converting resonance voltage resistant device, realizes the scene alternating current voltage resistance of large and superlarge GISs, a long-distance power transmission high-voltage cable and a constant voltage transformer CVT with extremely high requirement on frequency, and can effectively prevent the capacitance improving effect caused by large capacitance and insulation damage caused by boosting of voltage between a tested sample clamping space and the tail end, and the more and more dispersive the compensation electric reactor group is, the better the effect is.

The invention discloses a driving device of a high temperature super-conducting linear motor for rail transit, comprising a controllable variable-frequency power supply and a high temperature super-conducting linear motor; a primary iron core (4) of the high temperature super-conducting linear motor is composed of amorphous alloy slices or of non-magnetic materials directly; a high temperature super-conducting winding is connected with a controllable variable-frequency power supply (13); an air gap (6) is arranged between the bottom plane of the primary iron core and the upper surface of a secondary conductor plate (2); the high temperature super-conducting winding (3) adopts cake structure and a runway section; the winding is arranged in layers and is fixed in the groove of the primary iron core; a primary component is composed of the high temperature super-conducting winding (3) and the primary iron core (4), and is arranged in a cryogenic vessel (9) and fixed on a bogie (5); the secondary conductor plate and a secondary magnetic conductive steel plate (7) are fixed on the sleeper between the two rails. The driving device has the advantages of small volume, light weight, little energy loss and greatly increased reliability and prolonged service life; the driving device can be widely applied to trains, subways, urban metros, etc.

The invention provides a superconducting eddy-current braking device for a rail motor car, which comprises a braking controller with an excitation power supply and an eddy-current braking device, wherein an iron core column of an electromagnet of the eddy-current braking device adopts an iron core column of a superconducting electromagnet, a coil of the superconducting electromagnet is connected with the excitation power supply, the iron core column of the superconducting electromagnet is arranged on a steering frame of a carriage, and an air gap is reserved between the bottom plane of the iron core column of the superconducting electromagnet and the upper surfaces of steel rails of a rail. The superconducting eddy-current braking device for the rail motor car has the advantages that the eddy-current braking is non-contact electromagnetic braking, a superconducting electromagnetic system is adopted, the electric resistance of the coil approaches to zero, and the large current can be conducted into the coil, so the produced magnetic-field intensity is also large, and the produced electromagnetic force of eddy-current braking is also large. Compared with the prior art, the device has the advantages of small volume, light weight, and small consumption of electric energy, greatly improves the reliability and the service life, and can be widely applied to eddy-current braking technology of rail motor cars (such as trains, subways, city trains, tram cars and so on).

The invention provides an efficient energy-saving dual salient pole synchronous reluctance motor, comprising a motor mechanical body and a motor control part; wherein, the motor mechanical body comprises a motor shell, a stator which is arranged on the internal wall of the motor shell and a rotor which is arranged at the center in the motor shell; the rotor is arranged on a motor shaft; the motor mechanical body also comprises a motor end cover which is arranged at the two ends of the motor shell; the motor shaft is connected with the motor end cover by a bearing; a shaft sleeve and an oil seal are arranged between the internal end surface of the bearing and the rotor; wherein, the rotor is provided with 8 salient poles; the stator is provided with 12 salient poles and 12 winding coils which are corresponding to the 12 salient poles.

The invention discloses a power electronic reactor performance test device, which comprises a soft start module, an LCL filter module, a rectifier module, an energy storage module, an inverter module, a measurement module and a control unit module connected in sequence, wherein the input end of the soft start module is connected with an external power supply; the output end of the inverter module is connected with a tested reactor; the measurement module, the soft start module and the inverter module are connected with the control unit module respectively; the measurement module feeds sensor information back to the control unit module; and the control unit module controls the soft start module and drives the inverter module. The test device can simulate different working conditions, temperature rise test on the reactor is completed, on-load switching among test modules can be realized, shut down is not needed, the test work continuity is ensured, the time is saved, the working efficiency is improved, the test device is convenient to operate, and the device has the advantages that the power loss is little; the power is saved; a backstage can be connected in an online mode; and the test data can be transmitted in real time.

The invention, which belongs to the temperature control field, provides a heat dissipation system of an integrated circuit tester and a control method thereof. According to the invention, a heat dissipation system of an integrated circuit tester uses a field programmable gate array (FPGA) master control chip as a core; a temperature sensing unit is utilized to carry out sensing on a temperature of a cabinet of the integrated circuit tester; and the FPGA master control chip is used to determine whether the sensed temperature is higher than a cabinet temperature obtained previously and a low frequency pulse width modulation signal output by the FPGA master control chip itself is adjusted. Therefore, control on a rotating speed of a cooling fan can be realized; an objective of reduction of power consumption and noises is achieved; and problems of large power loss and severe noise pollution are solved, wherein the problems exist in a heat dissipation system of a current integrated heat dissipation system.

The invention discloses a small-size folding steering rotary cultivator which comprises a machine head positioned at the front end and a machine tail positioned at the rear end, wherein the machine head is partly provided with an oil storage tank, an internal combustion engine and a power system, a handheld steering and controlling mechanism, a speed changing mechanism and a driving mechanism; the driving mechanism comprises a front part and a rear part; a first driving mechanism is positioned on the machine head; a second driving mechanism is positioned at the machine tail; the speed changing mechanism arranged on the machine head is connected with the first driving mechanism and the second driving mechanism respectively through an output shaft; the machine head is connected with the machine tail through a hinge body steering/connecting mechanism; and a multi-purpose farm tool mounting mechanism is also arranged at the rear part of the machine head or the machine tail. The multi-purpose small-size agricultural machine disclosed by the invention not only can be used for cultivating dry land, vegetable land and water field, but also can be used for small-scale transportation, and simultaneously is low-carbon, protects environment, saves energy, is convenient and easy to operate, and has working efficiency.

The invention is a cable connector, comprising two internally symmetrical connecting bodies and characterized in that the upper and lower parts of the connecting body are each provided with a horizontal through fastening inner cambered surface contacting with the cable, the fastening inner cambered surface is provided with cone fastening thorns, and the two connecting bodies are provided with connecting holes and connected together by bolt. And its advantages: it can quickly and effectively connect cables (T-shaped connection) by making the fastening thorns pierce insulating skins and reach conductors, instead of peeling of the insulating skins.

The invention discloses an unloading one-way valve in order to solve the problem that the operating power loss of a hydraulic pump of a hydraulic system of a cutting table of a harvester is large. The unloading one-way valve comprises a valve body. A left cavity and a right cavity are formed in the valve body. The left cavity and the right cavity are communicated through a middle connecting hole. An annular valve seat is arranged at the connecting hole. A valve element capable of opening and closing the valve seat is arranged in the left cavity. An oil outlet is formed in the left cavity. A control piston used for controlling the valve element to open and close is arranged in the right cavity. An oil inlet is formed in the position, located on the left side of the control piston, of the right cavity. A control oil port is formed in the position, located on the right side of the piston, of the right cavity. Two oil holes are formed in the valve element. A piston cavity is formed in the control piston. A circle of unloading ring groove is formed in the periphery of the control piston. The unloading ring groove is provided with throttling oil holes communicated with the piston cavity.

The invention discloses a control system and method of a hybrid cascaded H-bridge rectifier, the output voltage ratio of which being 1: 2. By comparing total modulated wave vr1 and output vcmp of a cascaded unit 1:2 voltage division adjuster, a square wave output signal of a high-voltage unit modulator is obtained to drive a switching tube of a high-voltage unit H bridge; and a low-voltage unit modulated wave vr2 obtained after the total modulated wave vr1 subtracts the output signal of the high-voltage unit modulator 4) intersects with a high-frequency single-polarity triangular wave in positive and negative symmetry to obtain an output signal of a low-voltage unit modulator so as to drive a switching tube of a low-voltage unit H bridge. The method can obtain rectification voltage output,the voltage ratio of which is 1:2, so that the high-voltage unit switching tube having large voltage stress is allowed to work under a low frequency condition, switching loss can be greatly reduced,and meanwhile, the switching loss of a low-voltage unit having low voltage stress is also reduced; and high-frequency work can obviously reduce volume weight of a filtering device, and thus power density is improved.

The invention discloses a transformer test platform, and belongs to the technical field of electronic power and electronics. The transformer test platform disclosed by the invention is composed of a first AC/DC module, a DC/AC module, a transmission reactor and a second AC/DC module. The first AC/DC module converts external AC power into DC power, and DC voltages are adjustable; the DC/AC module converts the DC power into the AC power, and the AC power is connected with the primary winding of a transformer to be tested after passing through the transmission reactor; and after secondary-winding AC power of the transformer to be tested is output, the secondary-winding AC power is converted into AC power through the second AC/DC module for connection with the DC output side of the first AC/DC module. The test platform provided by the invention can conveniently adjust voltages, frequencies and currents of the transformer to be tested, is small in loss and is economical and environmental friendly.

An energy-saving method of central processing unit includes driving central processing unit to depart from dormant state of non-snoop event by system chip and entering a processing state for executing command as well as entering a system management mode when said unit is in dormant state of non-snoop event and requested event of bus bar main controller is sent out by peripheral device; then transmitting the requested event to control processing unit by arbitrator, driving said unit to be at dormant state of non-snoop event by closing arbitrator and executing an interruption program in system management after the requested event is processed .

The invention relates to the technical field of motors, and discloses a semi-superconducting ultra-efficient energy-saving motor, which comprises a motor shell, a rotor main body and a stator, the stator comprises a stator main body and a stator winding wound on the stator main body, and the stator winding comprises a silver-copper alloy material in the middle and a superconducting film wrapping the silver-copper alloy material. The superconducting film is made of a niobium-titanium composite superconducting material; according to the semi-superconducting super-efficient energy-saving motor provided by the invention, the problem of low operation efficiency of an existing motor is solved.

The invention discloses a combined energy system for underwater power supply. The combined energy system comprises a magnesium seawater fuel cell, a control unit, a primary lithium battery, a voltageconverter, a deep sea lander, a boosted circuit, a buck circuit, a charger, a secondary lithium battery, a protection circuit and a deep sea submersible. In the working state of the system, on one hand, the primary lithium battery and the magnesium seawater fuel cell work cooperatively to provide stable electric energy for the deep sea lander; on the other hand, the primary lithium battery supplies power to the deep sea submersible; meanwhile, the secondary lithium battery is charged; enough electric energy required by long-time detection operation of the deep sea submersible is ensured; therefore, the system can meet the requirements of long-time detection operation of deep-sea equipment, has the advantages of being stable in work, free of maintenance, low in cost, high in reliability andthe like, achieves stable power supply of deep-sea submersible electric equipment, and meanwhile solves the problem that power loss is large due to the fact that an underwater mooring line is long.

The invention discloses a dual-motor hybrid engine extended range power system and a driving method thereof. An engine and a motor machine and a driving motor and an output piece are in transmission connection with one at least three-stage planetary line. The three-stage planetary line transmits and outputs a driving force, and when closing and releasing of a corresponding brake are selected to act on a planetary line transmission relationship, working modes, including double-speed driving of the driving motor, high-efficiency power supplement of the dual-motor, the engine drives a generator to generate electricity independently and simultaneously drives the motor to drive at double speed, the engine is driven at a high speed and a low speed independently at a larger speed ratio, the engine drives the generator and the driving motor to generate electricity by a high-power dual-motor, the engine is started quickly, neutral gear and the like are achieved. The power system is characterized in that a space occupied is small, the electricity supplementing efficiency is high, the engine is driven independently to be suitable for being used in cold areas, loss of power extended range is small, endurance mileage is long, operation reliability is high, cost is low and the like.

The invention relates to an H-1type electrically-controlled magnetic motor belonging to the field of permanent magnet energy development. The H-1type electrically-controlled magnetic motor mainly consists of a non-magnetic conductive material case, a front end cover, a rear end cover, a main shaft, a position detection circuit board, a shielding plate, an H-1type stator, a salient pole type rotor, a bearing, an inner bearing pressure cover and an outer bearing pressure cover, wherein the H-1type stator consists of a magnetic conductive material, an electromagnetic coil and a permanent magnet; a stator core and an inner circle wall of the case are connected by bolts; the salient pole type rotor is in key joint with the main shaft; and a trough-type optocoupler of the sensor is mounted on the position detection circuit board on the outer side of the rear end cover of the main shaft. According to the H-1type electrically-controlled magnetic motor, the stator coil is controlled by a three-phase winding through a controller and acts on a magnetic conductive salient pole of the rotor, so as to drive the rotor to rotate, thus the permanent magnet energy can be effectively converted with low power consumption.