131results about How to "High boost ratio" patented technology

The present invention focuses on the development of a high-performance solar photovoltaic (PV) energy conversion system. The power circuit of the invention is made of a two-stage circuit, connecting a step-up DC-DC converter and a full-bridge inverter in serial. The present invention uses an adaptive perturbation and observation method to increase tracking speed of maximum power position and at the same time reduces energy loss. In addition, the full-bridge inverter's output has to have the same phase with the utility power in order to achieve unit power factor and increase the system efficiency. The present invention uses voltage type current control full-bridge inverter to achieve the goal of merging into utility grid. The present invention provides an active Sun tracking system, by utilizing the character of changing in open circuit output voltage with Sun radiation strength to follow the Sun, and decreases the system cost and increases system effectiveness.

The invention provides a grid-connected photovoltaic power generating system based on a novel direct current converter and a working method of the grid-connected photovoltaic power generating system. The grid-connected photovoltaic power generating system is characterized in that the grid-connected photovoltaic generating power system consists of a direct current converter, a grid-connected inverter, an isolation transformer and a control circuit; the working method comprises the steps as follows: 1. collecting signal; 2. MPPT module data processing; 3 applying an MPPT arithmetic; 4 inverter module data processing; 5. applying a grid-connected arithmetic; and 6. applying SPWM arithmetic. The grid-connected photovoltaic power generating system and the working method thereof have the advantages of small technical realization difficulty, obviously reducing the cost, flexible installation, convenient maintenance, high voltage and current detection precision, advanced control arithmetic, quick running speed of control chip, the system being capable of obtaining excellent tracking precision and stability, combining the hardware device with the software programming of a digital signal processor, simple design, low cost and easy realization of the hardware device, brief and understandable software programming arithmetic.

An ECU determines whether the ripple current is within a target range (S50). When it is determined that the ripple current is not within the target range (NO in S50), the ECU determines whether the ripple current is greater than or less than the target range (S80). When it is determined that the ripple current is less than the target range (NO in S80), the ECU reduces the carrier frequency of the boost converter that is a component of the ripple generating section (S90). On the other hand, when it is determined that the ripple current is greater than the target range (YES in S80), the ECU increases the carrier frequency of the boost converter (S100).

Voltage-boosting / lowering DC / DC converter includes a low-voltage-side port and high-voltage-side port, an inductor connected at one end to a positive-pole terminal of the low-voltage-side port, and a transformer of a magnetic-field cancellation type including a primary winding and secondary winding interconnected in an oppositely-wound configuration, a common terminal of the primary winding and secondary winding being connected to the end of the inductor. Switching element controls an energizing current of the primary winding flowing to a common reference terminal, another switching element controls an energizing current of the primary winding flowing to a positive-pole terminal of the high-voltage-side port, still another switching controls an energizing current of the secondary winding flowing to the common reference terminal, and still another switching element controls an energizing current of the secondary winding flowing to the positive-pole terminal of the high-voltage-side port.

The invention relates to a multi-sub microgrid-contained mixed microgrid system and a control method thereof. The mixed microgrid system comprises a photovoltaic subsystem, an energy storage subsystem, a direct-current bus, a DC / AC converter and an alternating-current subsystem. The control method comprises the following steps: controlling running modes of the photovoltaic subsystem and the energy storage subsystem according a power grid instruction; controlling the running mode of the photovoltaic subsystem by using a perturbation observation method-based photovoltaic generation maximum power tracking method; and controlling the running mode of the energy storage subsystem by using a method of combination of dual-closed loop control and phase-shift control. Compared with the prior art, the provided system and the method have the advantages of electrical isolation realization, high security, and stable bus voltage and the like.

The invention discloses a triangular connecting rod-toggle rod transmission mechanism with a large force magnification ratio for a servo press. The mechanism comprises a servo motor, an upper pin shaft, an upper toggle rod, a triangular connecting rod, a crank, a middle pin shaft, a lower toggle rod, an unloading oil cylinder and an ejecting oil cylinder, wherein the output shaft of the servo motor is connected with the crank through a transmission mechanism; the crank is connected with the connecting rod; the connecting rod is connected with the upper toggle rod and the lower toggle rod respectively; the upper toggle rod is hinged and fixed on the machine body; the lower toggle rod is connected with a slider capable of linearly reciprocating up and down along a guide rail of the machine body through a wedged overload protection block and the unloading oil cylinder; the upper toggle rod and the lower toggle rod have different lengths and are asymmetric; and the connecting rod is triangular. As symmetric toggle rods are changed into asymmetric toggle rods, and a linear connecting rod is changed into the triangular connecting rod, a relatively large force magnification ratio is obtained, the drive torque required by the crank is remarkably reduced, and the capacity and cost of the servo motor are reduced under the condition of guaranteeing compact structure of the machine body, enough stroke of the slider and monotonous descending of the slider.

The invention discloses a topological structure of a two-phase interleaved converter based on coupled inductors and belongs to the technical field of the power and electron technology. The two-phase interleaved converter based on the coupled inductors comprises a direct-current input source, two power switch tubes, the two coupled inductors with two windings, three one-way rectifier diodes, an output diode, a clamping capacitor, two intermediate energy-storage capacitors and an output filter capacitor. According to the two-phase interleaved converter based on the coupled inductors, the boosting capacity is high, output with a higher step-up ratio can be achieved, and stress of the peak voltage of the power switch tubes and stress of the peak voltage of the diodes are reduced to a certain extent; meanwhile, zero-current switching-on of the power switch tubes and turning-off the diodes are achieved through the leakage inductance of the coupled inductors, in this way, the conversion efficiency of a whole conversion circuit is improved, and input current ripples are reduced due to the adoption of a two-phase interleaved control method.

The invention discloses a single-stage boost inverter, and belongs to the technical field of power electronic converters. The single-stage boost inverter comprises power switch tubes S1, S2, S3, S4 and S5, diodes D1, D2 and D3, an inductor L1 and a capacitor C1; one end of the inductor L1 is connected with one end of an input power supply Uin; the other end of the inductor L1 is connected with theanode of the diode D1; the cathode of the diode D1 is connected with the A end of the power switch tube S1, the A end of the power switch tube S2 and one end of the capacitor C1, respectively; the anode of the diode D2 is connected with the other end of the capacitor C1, the power switch tube S3, the C end of the power switch tube S4 and the anode of the diode D3, respectively; and the cathode ofthe diode D2 is connected with the C end of the power switch tube S1, the A end of the power switch tube S5 and the other end of the input power supply Uin, respectively. Aiming at the problem of lowstep-up ratio of the boost converter in the prior art, the single-stage boost inverter is high in integration level and relatively high in step-up ratio.

The invention provides a single-switch inverted output quadratic wide gain converter which comprises a Boost circuit, a Buck-Boost circuit and a Buck circuit which are sequentially connected, wherein the Boost circuit is formed by an input power supply, a first inductor, a first diode, a second diode, a switching tube and a first capacitor; the Buck-Boost circuit is formed by the first capacitor, a second inductor, a second capacitor, a third diode and the switching tube; and the Buck circuit is formed by the second capacitor, the switching tube, a fourth diode, a fifth diode, a third inductor, a third capacitor and a load. According to the invention, only one switching tube is used; the Boost circuit and the Buck-Boost circuit share the first capacitor; and the Buck-Boost circuit and the Buck circuit share the second capacitor. The single-switch inverted output quadratic wide gain converter has a simple structure and is convenient to control; and an output voltage has a wide gain. According to the invention, the polarity of an input voltage is opposite to that of the output voltage.

The invention discloses a transformer with a high set-up ratio, a solar inverter and a solar battery system. According to the invention, the low output voltages of power sources are converted to high output voltages through the transformer with the high set-up ratio; and according to the specific application and different control methods, the outputs of the transformer with the high set-up ratio from a first technical scheme to a fourth technical scheme can be standard direct current voltages or controlled and modulated specific voltage wave forms. By using the transformer with the high set-up ratio, the solar inverter and the solar battery system, the defects of small set-up ratio, long transmission path, large additional loss, low energy conversion efficiency and the like in the prior art can be overcome, so as to realize the advantages of large set-up ratio, short transmission path, small additional loss and high energy conversion efficiency.

The anion generator of the present invention is mainly composed of casing, interior circuit, ion emitting head etc. The casing comprise insulating case and conducting protective grille, the interior circuit mainly comprise power circuit and oscillation boosting circuit. The power circuit is comprised of AC power supply circuit and DC power supply circuit, which supply power for the oscillation boosting circuit alternately through change-over switch. The oscillation boosting circuit is composed of oscillation circuit, boosting circuit and multilevel dual voltage circuit. The character of the present invention is that, the conducting protective grille fixed on the casing has charge, so the diffusion of anion is accelerated; the said boosting circuit employs sheet piezoelectric ceramic transformer for boosting, which is simple in structure, small in volume and without protective circuit; and protective resistance is connected between the multilevel dual voltage circuit and ion emitting head. The circuit, casing and conducting protective grille of the invention is novel , so it's small and no protective circuit, high boosting ratio, safe and stabilized, low electromagnetic interference, fireretardant. The present invention could be used for the production of air-conditioner, vehicular and household electric appliances, beautification and health protection etc.

A parking-brake operating mechanism is provided with an adjusting spindle, a cam shaft to which a parking lever is connected, and a thrust transmitting assembly disposed between the cam shaft and the adjusting spindle. The thrust transmitting assembly includes a rolling roller which can roll between the cam shaft and the adjusting spindle. Rolling curved surfaces are provided respectively at the cam shaft and the adjusting spindle. The rolling roller is disposed in contact with the rolling curved surfaces.

The invention discloses a topological structure of a coupling inductor and voltage doubling circuit combined set-up converter, and belongs to the power electronic technical field. The coupling inductor and voltage doubling circuit combined set-up converter has the high set-up capacity and comprises two controllable power switch tubes, two coupling inductors with two windings, three one-way rectifier diodes, an output diode, a clamping capacitor, two middle energy-storage capacitors and an output filtering capacitor. Output with the high set-up ratio can be achieved through the coupling inductors and a voltage doubling circuit in the coupling inductor and voltage doubling circuit combined set-up converter, the peak voltage stress of the power switch tubes and the diodes can be reduced, meanwhile, zero-current turn-on of the power switch tubes and turn-off of the diodes are achieved through leakage inductance of the coupling inductors, and the coupling inductor and voltage doubling circuit combined set-up converter is suitable for renewable energy electric generation systems such as a standby energy system, a photovoltaic cell and a fuel cell in future, and has the good practical value and the wide popularization prospects.

A reaction device wherein a ratio of input force to output force for a brake booster is sequentially changed during a brake application. An actuation force derived from a pressure differential acts on a movable wall and is communicated through a cage as an output force to an push rod. The output force is a functional ratio of the input force as modified by a reaction disc and elastic means during a brake application. The reaction device functions as a rigid member until the input force reaches a first predetermined level Fd and a first boost ratio is in effect until a second predetermined force Fe is reached and a second boost ratio is in effect until a third predetermined input force level Ff is reached and a third boost ratio is in effect until a fourth predetermined fource level is reached.

A boost circuit includes: level shifters 3 and 4 for shifting a high level of a clock signal; a first boost means which contains transistors QP3 and QP4 for conducting switching in accordance with the clock signal whose high level has been shifted and capacitors C1 and C2 and, thereby, generates a power source potential VDC2 by conducting a charge pump operation; level shifters 1 and 2 for shifting a high level of a clock signal; inverters IV41 to IV52 for shifting a low level of the clock signal whose high level has been shifted; and a second boost means which contains transistors QP1 and QP2 for conducting the switching in accordance with the clock signal whose high level and low level have been shifted and capacitors C3 and C4 and, thereby, generates a power source potential VDC3 by conducting the charge pump operation.

The invention discloses a secondary type high-gain boosting converter with switched capacitors and a coupled inductor. The secondary type high-gain boosting converter comprises a direct-current input power source, a first inductor, a first diode, the coupled inductor, the first capacitor, a second diode, a switching tube, a third diode, the second capacitor, a fourth diode, the third capacitor, a fifth diode, the fourth capacitor, a sixth diode, the fifth capacitor, a seventh diode, an eighth diode, the first output capacitor, the second output capacitor and a load. According to the secondary type high-gain boosting converter, a driving circuit and a main circuit are grounded together and share only one switching tube, a control circuit is simple, the higher output voltage gain is obtained under the low duty ratio, the input current and output voltage ripples are reduced, the voltage stress and turn-on losses of a switching element are reduced, meanwhile, the turn ratio of the coupled inductor needed by the circuit is small, and the saturation problem of a magnetic core component is avoided. The secondary type high-gain boosting converter is quite suitable for occasions of low-voltage input and high-voltage output.

The invention relates to a bidirectional multi-freedom power adjusting vehicle-mounted wireless power transmission system, for power transmission of an electric automobile and a power network. The system comprises a controller, and a positive power transmission loop and a reverse power transmission loop which are of the same structure. The positive power transmission loop and the reverse power transmission loop each comprise a power source module, a boost / filter module, an inversion / rectification module and an electromagnetic conversion module which are successively connected, wherein the power source module, the boost / filter module, the inversion / rectification module and the electromagnetic conversion module are respectively connected with the controller. Compared to the prior art, the system provided by the invention has the advantages of multiple freedom, multiple control modes, high efficiency, large boost ratio, high flexibility, simple control system, two-way transmission and the like.

A bidirectional DC-DC converter based on coupling inductors belongs to the technical field of converters. The converter comprises the two coupling inductors L1 and L2, two diodes D1 and D2, a buffer capacitor C1, a power source VS, a filter capacitor Cd, a load Cd, and two power switch tubes Sw1 and Sw2. The invention has the advantages as follows: by virtue of the coupling inductors, the step-up ratio of the converter is improved; leakage inductance energy of the coupling inductors is absorbed through the filter capacitor, so that the peak voltage stress of each switch tube can be effectively reduced; and since the diode D1 prevents the buffer capacitor C1 from discharging electricity to an input terminal, the energy (incl., leakage inductance energy) accumulated by the buffer capacitor C1 is totally transmitted to a load through the inductively-coupling inductors, and then the efficiency of the converter is improved.

An ECU determines whether the ripple current is within a target range (S50). When it is determined that the ripple current is not within the target range (NO in S50), the ECU determines whether the ripple current is greater than or less than the target range (S80). When it is determined that the ripple current is less than the target range (NO in S80), the ECU reduces the carrier frequency of the boost converter that is a component of the ripple generating section (S90). On the other hand, when it is determined that the ripple current is greater than the target range (YES in S80), the ECU increases the carrier frequency of the boost converter (S100).

A boost device boosts an input voltage to an output voltage across an output capacitor, and includes first and second output diodes coupled to the output capacitor, and a transformer coupled to first and second switches, first and second switching circuits, and to the first and second output diodes, and receiving the input voltage. The first and second switches are operated alternately in an ON-state, and have overlapping duty cycles. The first and second switching circuits are operable to suppress conduction losses for the first and second switches. The transformer has a bi-directional magnetic circuit. Electric energy is transformed through induced currents of the transformer, and a small amount of energy attributed to an exciting current of the transformer is used for voltage boosting, thereby attaining a relatively high output power.

The invention relates to a single-stage single-phase current type inverter with a high step-up ratio, belonging to the power electronic technology. The inverter comprises an energy storage inductor having a central tap, a single-phase inverting bridge and a single-phase filter in order cascade connection; an energy storage switch is connected between the central tap of the energy storage inductorand the input DC power supply; the input DC power supply, the energy storage inductor and the energy storage switch form a magnetizing loop; the single-phase inverting bridge comprises a two-phase power-limiting switches for bearing two-way voltage stress and one-way current stress. The inverter can convert unstable DC into stable and excellent single-phase output AC, and has the advantages of single-stage power conversion, high power density, high conversion efficiency, high step-up ratio, low distortion degree of output wave shape, high reliability in overloading and short circuit, low costand the like; the inverter is suitable for the step-up, middle and small capacity single-phase passive and grid-connected inverting occasions; and the inverter further shows unique advantages along with the appearance of novel components such as two-way blocking IGBT and the like.

The invention relates to a quasi-square-wave pulse generator, specifically to a high-voltage long-pulse-width quasi-square-wave pulse generator, and belongs to the technical field of pulse power. The pulse generator consists of three parts, including a pulse formation module, a pulse voltage boosting module and a load, wherein the input end of the pulse formation module is connected with the output end of a primary energy storage system while the output end of the pulse formation module is connected with the input end of the pulse voltage boosting module; and the output end of the pulse voltage boosting module is connected with the load. The invention, aiming to overcome the shortcomings of an over large number of network nodes required by the pulse formation module, short service life, relatively poor output waveform flat stability, severe waveform distortion of the pulse voltage boosting module, low pulse voltage boosting ratio and the like by solving technical problems, provides the high-voltage long-pulse-width quasi-square-wave pulse generator; and the high-voltage long-pulse-width quasi-square-wave pulse generator has the advantages of relatively low cost, less network nodes, maintenance-free property, high pulse voltage boosting ratio, distortionless pulse waveform and the like, so that high-voltage long-pulse-width quasi-square-wave pulse output with high flat stability is realized.

The invention relates to the technical field of a high voltage power supply. The invention provides a high voltage power supply for a mobile environment and a production method, in order to solve the problems of the prior art. The high voltage power supply is supplied according to the power supply requirement for high-parameter pulse power supply under the mobile environment. The low-voltage and low-power (typically 24V-32V / below 1 kW) power supply condition is utilized to realize instant high-voltage and high power (typically 100kW / 10kW) output parameter. An electrode of a capacitor set, a power supply (external) and direct current input ends of a plurality of inverters are in parallel connection with each other; an alternating current output end of each inverter is respectively connected with a primary coil of a transformer; a secondary coil of each transformer is connected with an alternating current input end of a rectifier; the direct current output ends of n rectifiers are serially (cascading) connected with each other through a wire and are used for outputting high voltage; when the high-voltage power supply runs, the outputted electric energy is mainly supplied by the capacitor set; the capacitor set has higher capacity and can meet the repeated recharging requirements of the loads.

Voltage-boosting / lowering DC / DC converter includes a low-voltage-side port and high-voltage-side port, an inductor connected at one end to a positive-pole terminal of the low-voltage-side port, and a transformer of a magnetic-field cancellation type including a primary winding and secondary winding interconnected in an oppositely-wound configuration, a common terminal of the primary winding and secondary winding being connected to the end of the inductor. Switching element controls an energizing current of the primary winding flowing to a common reference terminal, another switching element controls an energizing current of the primary winding flowing to a positive-pole terminal of the high-voltage-side port, still another switching controls an energizing current of the secondary winding flowing to the common reference terminal, and still another switching element controls an energizing current of the secondary winding flowing to the positive-pole terminal of the high-voltage-side port.

The invention discloses a unidirectional direct current voltage transformer which comprises a voltage source type current converter, an uncontrollable rectifier, and an inductor-capacitor voltage step-up loop circuit, wherein positive and negative electrodes of the voltage source type current converter are respectively connected with positive and negative electrodes of a low voltage direct current system; positive and negative electrodes of the uncontrollable rectifier are respectively connected with positive and negative electrodes of a high voltage direct current system; an alternating current side of the voltage source type current converter is connected with one end of an alternating current inductor, the other end of the alternating current inductor is connected with one end of an alternating current capacitor, the other end of the alternating current inductor is also connected with an alternating current side of the uncontrollable rectifier via an alternating current voltage transformer, and the other end of the alternating current capacitor is grounded. According to the converter in the invention, technologies of realizing two stage voltage step-up via the inductor-capacitor and the alternating current voltage transformer are adopted, the quantity of used power modules can be greatly reduced, and difficulty of controlling voltage sharing and current sharing among all power modules can be lowered.

A laminated piezoelectric transformer according to the present invention comprises (a) a laminated body formed by laminating a plurality of ceramic layers and a plurality of internal electrodes and (b) a plurality of external electrodes electrically connected with the internal electrodes and disposed on the surface of the laminated body. Further, the internal electrodes of the laminated piezoelectric transformer of the invention are characterized by having a plurality of primary internal electrodes positioned at the middle portion along the longitudinal direction of the laminated body and a plurality of secondary internal electrodes positioned at both end portions of the laminated body. By virtue of this configuration of the invention, the polarization volume on the secondary side can be enlarged and, therefore, the laminated piezoelectric transformer of the invention can step up voltages at high energy conversion efficiency.

The invention relates to a production method of piezoelectric ceramic that comprises: PZN-PZT ceramic powder which adulterates MnO2, Sb2O and Cr2O3 is pressed under the 20-50MPa; The silver electrode is burnt; the ceramic piece is polarized at temperature of 50-200DEG C, electric field intensity of 500V / mm-3000V / mm for 20-40 minutes, it is burnt for 1-3 hours at temperature of 900-1240DEG C to form piezoelectric ceramic piece; Several piezoelectric ceramic pieces are folded to an integral, and down-lead upwards; it is encapsulated outer to construct the piezoelectric ceramic transformer. The step-up ratio is high that is about 2 times of overlay piezoelectric transformer of general material.

The invention discloses an efficient bidirectional DC-DC converter comprising a capacitor circuit, a first isolated bidirectional DC-DC conversion circuit, a second isolated bidirectional DC-DC conversion circuit, and a filter capacitor. The capacitor circuit comprises a fourth capacitor and a fifth capacitor connected in series therewith. Both ends of the capacitor circuit are used as a first connection terminal of the efficient bidirectional DC-DC converter. Both ends of the fourth capacitor are connected with both ends of the input side of the first isolated bidirectional DC-DC conversion circuit respectively. Both ends of the fifth capacitor are connected with both ends of the input side of the second isolated bidirectional DC-DC conversion circuit respectively. The output end of the first isolated bidirectional DC-DC conversion circuit is connected to the output end of the second isolated bidirectional DC-DC conversion circuit and is connected to the filter capacitor. Both ends of the filter capacitor are used as the second connection terminal of the efficient bidirectional DC-DC converter.

The invention discloses a non-isolated bidirectional DC / DC converter with high step-up ratio, which can realize wide range and high step-up ratio adjustment. A converter system consists of several standard modules, and the standard modules uses BUCK-BOOST circuits as basic topology. The standard modules adjust the switching tube duty cycle through the respective closed-loop control loops to achieve their respective voltage rises. The system connects the outputs of multiple modules in series to achieve the rise of the total output voltage of the system. The total output voltage is the sum of the input voltage of the lower voltage and the output voltage of each standard module. The whole system distributes the total output voltage to each standard module by connecting the input terminals inparallel and the output terminals in series. The boosting comparison system of each level module reduces the total boost ratio, therefore, each stage module has a wide range of duty cycle adjustment,and the purpose of adjusting the overall duty cycle of the converter is wide. At the same time, the overall converter system makes the overall efficiency of the converter high by adopting parallel connection of the output terminals.