651results about How to "Simple topology" patented technology

The present invention discloses a non-isolated AC-AC three-level AC-AC converter which has a structure comprising an input filter, a multilevel converter and an output filter connected in turn. Wherein the multilevel converter is composed of a basic constitution unit of two capacitors clamping, an energy-storage inductor and an energy-storage capicitor which are constitued for converting the input voltage to three output levels; the basic constitution unit is composed of a four quadrants power switch and a clamping capicitor. By different combinations with the input filter, basic constitution unit and output filter, a circuit topology family for non-isolated AC-AC three-level AC-AC converter including Boost type, Buck-Boost type, Cuk type, Sepic type and Zeta type. The invention with improved converting effiency, power density, reduced volume and weight as well as input side power factor is fit for high voltage AC-AC electric power converting, due to the reduced volume and weight of the output filter and improved output waveform quality, the application fields of three-level AC-AC converter can be widened.

An adaptive regulator for the headlight of car is composed of a central control unit with MCU chip, a drive executing unit with step motor, a LIN bus transceiver between said central control unit and drive executing unit, and a position feedback module between said MCU chip and step motor. A method for setting up the initial position of headlight and an algorithm for the lighting on curved road are also disclosed.

The invention relates to a low and medium power high frequency DC-DC converter suitable for high-voltage input, which is based on the fundamental principle that: series capacitors are connected to a high-voltage direct current input, each capacitor serves as an input of the high-frequency forward DC-DC converter, and the outputs of the high-frequency forward DC-DC converter share a filter inductor, a freewheeling diode and an output filter capacitor; voltage feedback is acquired by sampling the output voltage of the high-frequency forward DC-DC converter, and a given reference voltage is compared with the voltage feedback so as to obtain a voltage loop output, namely a main output, by voltage regulation and calculation; and then, high-frequency forward DC-DC converter driving signals which are equational and alternate in phase are acquired to realized the control over a main circuit. The DC-DC converter has the advantages that: a low-voltage switching element is used under high voltage direct current input; the topology is simple; the cost is low; and the output has excellent dynamic and static performance.

The invention discloses a distributed global optimum energy management system based on an alternating direction method of multipliers. The distributed global optimum energy management system is a system taking a plurality of energy storage devices as units under a single microgrid, the microgrid comprises different nodes, each node is connected with a corresponding energy storage module, an energy management module, a dynamic load and a renewable energy power generator, different nodes are connected with one another through a topological graph mode, information can be exchanged between adjacent nodes, the energy management parameter of each node is synchronously updated through information exchange, so that the total energy consumption of the whole microgrid is adjusted to global minimum in real time. By tracking a charge status of the energy storage module and simultaneously considering factors such as the energy supply and demand balance condition of the microgrid, the loss of a transmission line, the discontinuity of the renewable energy power generator, the dynamic change of a load and the charging/discharging efficiency of the energy storage system, the power flow on a power line is dynamically minimized, and the purpose of reducing power loss is achieved.

The invention discloses an isolated drive circuit of a DC converter, which relates to technical field of circuit drive. The isolated drive circuit of the DC converter comprises: an isolated transformer, a primary winding, a primary winding drive circuit, a first secondary winding and a second secondary winding whose same name ends are opposite, and a first switch pipe and a second switch pipe; the different name end of the first secondary winding is connected with source electrode of the first switch pipe, the same name end is connected with the drain electrode of the first switch pipe through a first resistance, the different name end of the first secondary winding is connected with the grid electrode of the first switch pipe through a first diode; the different name end of the first secondary winding is connected with the anode of the first diode; the same name end of the second secondary winding is connected with the source electrode of the second switch pipe, the different name end is connected with the drain electrode of the second switch pipe through a second resistance, the same name end of the second secondary winding is connected with the grid electrode of the second switch pipe through a second diode; the same name end of the second secondary winding is connected with the anode of the second diode. The whole circuit has simple topology, high reliability, can be used for many occasions flexibly.

The invention relates to a cascading-type STATCOM (Static Synchronous Compensator) DC (Direct Current) side capacitor voltage balance control method. In the control method, the direct current control and the indirect current control are combined. The method comprises the following steps: generating an active current reference value; selecting a special bridge; generating an STATCOM output current reference value; carrying out indirect current control of the special bridge; and carrying out direct current control of a non-special bridge. The control method provided by the invention is used for controlling the cascading-type STATCOM DC side capacitor voltage balance. The method not only ensures the balance of a DC capacitor voltage between H bridges and improves the response speed of a control link and optimizes the system performance, but also does not require an additional hardware circuit and cannot ensure the hardware cost of a STATCOM device to be increased.

This invention relates to a vector decode method of LDPC code and its device based on the unit array and circulation shift array, which first of all divides received data into an array R containing nb vectors, computes an initial value of the reliability vector array and transfer information vector array, utilizes the transfer information vector matrix got from k-1 secondary iteration, reliability vector array and an un-I element value hij of a basic matrix to compute the kth time iteration transfer information vector matrix and reliability vector array, then to hard decide if the decoding is successful, if not, it continues the iteration, and all the vectors are 1x z soft bit ones. The device includes a basic matrix process module, an initial value operation module, an iteration operation module, a hard-decision check module and a control module, all storage modules can store z soft bits, the minimum operation units are z soft bit vector operation and the computing unit of each module reads and writes data directly from related storage modules.

The invention relates to a method for segmenting a sulus region on the surface of a pallium of a three-dimensional cerebral magnetic resonance image. The technical characteristics lie in that firstly, the 3D cerebral nuclear magnetic resonance image is pretreated and the surface of the pallium is reconstructed, including removing a braincase and non-cerebral tissues; carrying out cerebral tissue segmenting on a cerebral image and reconstructing the surface of the pallium of geometrical accuracy and correct topological structure in the segmented cerebral image; the surface of the pallium is shown by a series of vertexes and triangles; secondly, the maximum principle curvature and the minimum principle curvature of each vertex on the surface of the pallium are estimated; and finally, sulus and gyrus regions are segmented on the surface of the pallium according to the maximum principle curvature and Hidden Markov Random Field expectation maximization framework and each sulus region is marked by connectivity analysis. Compared with other methods, the method has the advantages of simple and effective algorithm and high segmentation accuracy.

The invention discloses a driving system for a fault-tolerant converter of a doubly salient motor and a control method of the driving system. The driving system is applicable to a single-tube open-short fault of a full-bridge converter or a double-tube open-short fault of the same bridge arm and an outgoing end open-short fault of a single-phase armature winding of the motor, and belongs to the technical field of motor control. The main body of the fault-tolerant converter comprises a four-phase full-bridge inverter, a four-phase armature winding of a doubly salient electro-magnetic motor (DSEM) and a bidirectional switch. When the doubly salient motor driving system normally runs, the bidirectional switch is switched off, the fault-tolerant converter outputs four phase symmetric rectangular wave currents with a different electrical angle of 90 degrees, the four phase symmetric rectangular wave currents are sequentially flown through the four-phase armature winding of the motor, and the motor is driven to run; and after an open-circuit fault is detected, fault-tolerant control is carried out, the fault-tolerant converter is switched to a fault-tolerant state from a fault state, and the motor is driven to stably run with the fault.

The invention relates to a single-isolation combination pressure increase and reduction type multi-input direct current converter, wherein the circuit structure is formed by connecting one multi-input single-output high-frequency inverter circuit, a plurality of common-ground input LC filters and one common output high-frequency isolation transformation energy-storage commutation filter circuit, wherein each input end of the multi-input single-output high-frequency inverter circuit is correspondingly connected with the output end of each input LC filter and the output end of the multi-input single-output high-frequency inverter circuit is connected with the input end of the high-frequency transformer. The converter has features of input direct current power supply common-ground, no insulation between the high-frequency inverter circuits, insulation between output and input, strong voltage match capability, time-sharing power supply of multi-input power supply, simple circuit, common use of output high-frequency transformer and energy-storage commutation filter circuit, high power density, high efficiency, small output voltage ripple, magnetization energy transfer of high-frequency transformer to load, and low cost, as the key technique for a distribution type power supply system of various renewable energy resources.

The invention discloses a high-efficiency wide-load-range three-phase micro-inverter and a control method thereof. The high-efficiency wide-load-range three-phase micro-inverter includes a front stage DC-DC converting module used for transmitting electric energy output by a photovoltaic assembly and tracking the maximum power point of the photovoltaic assembly; a middle-stage quasi-third harmonic injection circuit used for injecting AC current meeting power grid connection condition obtained through combination of inverted six-pulse DC current output by the front-stage circuit and quasi-triangular wave output by said circuit; a rear-stage bridge-type inverting circuit, filtering circuit and power grid used for performing inversion on current output by a power optimizing module, filtering the current obtained through combination of the inverted current and the quasi-triangular wave output by the quasi-third harmonic circuit through the filtering circuit and injecting the current into the power grid. The invention also discloses methods for analyzing and designing the quasi-third harmonic injection circuit and extracting ad controlling quasi-third harmonic wave injection current reference signals. The three-phase micro-inverter has characteristics of being simple in structure, high in converting efficiency and small in size.

The invention discloses a high-gain bidirectional four-phase DC-DC converter based on a coupling inductor and a control method. The converter comprises the four-phase coupling inductor, eight power switch tubes S1 to S8 and five capacitors CL, C1, C2, CH1 and CH2, wherein the inductance of all phases of the coupling inductor includes inductance L1 to L4, the coupling mode is a positive-negative coupling mode, and that is to say, positive coupling is realized between odd-number phases and between even-number phases of the coupling inductor and negative coupling is realized between the odd-number phases and the even-number phases. The converter has a higher voltage conversion ratio, and the voltage conversion ratio of the converter can be increased to be four times that of a traditional bidirectional four-phase DC-DC converter; the power switch tubes have lower voltage stress, the voltage borne when the power switch tubes S2, S4 and S6 are turned off is one half of the high-voltage sidevoltage, and the voltage borne when the power switch tubes S1, S3, S5, S7 and S8 is one fourth of the high-voltage side voltage.

The invention discloses a mixed micro-grid system of a large-scale energy recycling power battery pack test device. The mixed micro-grid system comprises a tested power battery pack and an alternating-current grid, and further comprises a test unit, a direct-current voltage-variable unit, an alternating-current voltage-variable unit, a direct-current bus and an energy storage unit. The test unit is connected between the power battery pack and the direct-current bus and comprises a bidirectional DC/DC conversion assembly which is used for enabling the voltage in the power battery pack to be matched with the voltage in the direct-current bus. The mixed micro-grid system has the advantages that a power battery pack test grid-connected alternating-current micro-grid power generation system generally adopted in current power battery pack manufacturers is changed through the mentioned components of the system; the design of a test device converter is facilitated, in other words, the test device converter is mainly composed of a one-stage converter instead of a two-stage converter and a filter in the prior art; meanwhile, the energy storage battery pack and a super-capacitor set are arranged, and therefore stability of the voltage of the direct-current bus of the high and low voltage side in a direct-current micro-grid is ensured, and energy supplementing and supporting are achieved.

The invention provides a turn-on characteristic testing apparatus of a large power semiconductor device. The turn-on characteristic testing apparatus of a large power semiconductor device comprises a constant current source unit, a testing main circuit unit, a heating loop unit and a protective loop unit, wherein the constant current source unit outputs direct current and can charge an adjustable capacitor C; the adjustable capacitor C is charged to reach a testing voltage; in the course of discharging, the adjustable capacitor C generates a testing current with an adjustable electric reactor L in a resonance oscillation way; in such a way, a turn-on test on the large power semiconductor device under various working conditions is realized; the heating loop circuit heats the large power semiconductor device to a testing junction temperature; and the protective loop unit prevents damages to the large power semiconductor device caused by the test. With the adoption of the turn-on characteristic testing apparatus of a large power semiconductor device, the turn-on test can be performed on the tested large power semiconductor device under the various conditions; the device is simple and practical in topological structure and comprehensive in function, and can satisfy the requirements of the turn-on characteristic test on the device under the various conditions; meanwhile, the protective measures for the device and the tested device in the case of faults are fully taken into account; and therefore, the reliability is high.

The invention provides a solid-state circuit breaker RCD buffer circuit integrating fault locating function and a fault point detection method. The solid-state circuit breaker RCD buffer circuit comprises a RCD buffer circuit. One end of a capacitor Cs is connected with a collector of V1, the other end of the capacitor Cs is connected with a resistor Rs and the anode of a diode Ds, and the other end of the resistor Rs is connected with signal ground. One end of a relay Ts is connected with the cathode of the diode Ds, the other end of the relay Ts is connected with the collector of V2 and shares a control signal with an isolation switch T for controlling connection when a diode Ds branch plays buffering effect and disconnection during a fault positioning process. Accurate positioning of a fault point can be realized by controlling the action of an isolation switch, a relay and a solid-state circuit breaker while effectively suppressing the over-voltage shutdown. The solid-state circuit breaker RCD buffer circuit is used for the rapid troubleshooting of a DC microgrid to ensure the reliability and security of a system, improve the utilization of the device and reduce the size and cost of a protection device. The topology is simple, and the application feasibility is ensured.

The invention discloses a complex line full parallel AT traction power supply system and method based on comprehensive energy. The system comprises a complex line full parallel AT traction power supply system and a comprehensive energy system; a photovoltaic array, a wind generating set and a fuel cell are connected in parallel to a direct current bus, electric-hydrogen storage is added to supplement power vacancy and peak load shaving, comprehensive energy is accessed into a traction power supply system through a reasonable mode, the power and the state of each microsource are detected in real time, the energy optimization management by taking the lowest total generation cost as a target is achieved based on a particle swarm optimization. The complex line full parallel AT traction powersupply system and method based on comprehensive energy can ensure the safety and stability of the system and the high reliability of power supply; the traction energy consumption structure is optimized, and the new energy consumption level is improved; and the method meets the development direction of national energy conservation and emission reduction, and reduces the power supply requirement ofthe electrified railway on the power system to a certain extent.

A hybrid direct-current current-limiting breaker comprises a rapid mechanical switch B, an IGBT module G, a thyristor module T1, a thyristor module T2, a current limiter FCL, an inductor L1, a capacitor C1 and a lightning arrester MOV. The rapid mechanical switch B is connected between a connecting point 1 and a connecting point 5, the IGBT module G is connected between a connecting point 2 and the connecting point 5, the rapid mechanical switch B is connected with the IGBT module G in series, the thyristor module T2 is connected between the connecting point 1 and the connecting point 2, both the thyristor module T1 and the current limiter FCL are connected between the connecting point 2 and a connecting point 3, and the thyristor module T1 is connected with the current limiter FCL in parallel; and the capacitor C1 is connected between the connecting point 1 and a connecting point 4, the inductor L1 is connected between the connecting point 3 and a connecting point 4, the capacitor and the inductor are connected in series, and the lightning arrester MOV is connected between the connecting point 1 and the connecting point 3. During stable operation of a power grid, the breaker presents low impedance, and influence on the power grid is small; and when a fault occurs in a direct current transmission line, fault current limiting and cutoff of the faulty line can be rapidly realized.