87results about How to "Realize current sharing" patented technology

The invention relates to the field of direct current (DC)/DC conversion and rectification, and aims to provide a multiphase current-sharing controlled parallel-connection adjusting circuit and a control method. The circuit comprises n phases of adjusting circuits connected in parallel, the structure of each phase of the adjusting circuits are identical; each phase comprises a main transformer and an auxiliary transformer; a primary side winding of the master transformer and a primary side winding of the auxiliary transformer in each phase of circuits are connected in series and then connected in parallel to two ends of an equivalent alternating input power supply PN; secondary side windings of the main transformers in two outputs penetrate through the rectification circuit and then are directly connected to the right end of a current device output side, and the other end is grounded; a secondary winding of the auxiliary transformer in another circuit penetrates through the rectification circuit and then is connected to the input end of a DC-DC converter, and the output end of the DC-DC converter is connected in parallel to the current device output side. Current sharing among multipath transformers is achieved by controlling the balance of power of a small-power DC-DC module; the feedback is realized on a secondary side, the feedback signal can be transmitted to a primary side without isolation, and the system reliability is improved.

The invention discloses a multi-phase alternating resonant converter. The multi-phase alternating resonant converter comprises at least two unit resonant circuits, wherein each unit resonant circuit comprises an inverter circuit, a resonant circuit, a transformer and a rectifying circuit; the inverter circuit is used for generating square waves and is connected with input voltage; an input port of the resonant circuit is connected with the inverter circuit; an output port of the resonant circuit is connected with the primary side of the transformer in parallel; the secondary side of the transformer is connected with the rectifying circuit; the secondary side of the transformer in one unit resonant circuit is connected with the secondary side of the transformers of other unit resonant circuits in a star-shaped manner. The invention provides the multi-phase alternating resonant converter which is formed by connecting at least two unit resonant circuits in parallel, so that the flow equalization of the multi-phase power conversion unit is achieved, the output ripple current is reduced, and the conversion efficiency of the resonant conversion circuit system is improved.

The embodiment of the invention provides a resonant switching circuit. The resonant switching circuit comprises at least two resonant switching circuit units, wherein the resonant switching circuit units are staggered and connected in parallel, and magnetic devices in the resonant switching circuit units are alternately and magnetically integrated on the same magnetic core. As the magnetic devices integrated on the same magnetic core can exert a magnetic path coupling effect, a self current-balancing effect can be produced by currents on circuit branches of different phases, so that the current balance of the resonant switching circuit units in the resonant switching circuit is realized, and the volume of a power supply is reduced due to the integration of the magnetic devices.

This invention proves a uniform current method and a device for stagger-controlling power-factor correcting circuit which samples induction currents of two parallel units and applies a uniform current control method that two control chips control two power switches separately and share one primary current to guarantee induction current of each path the same to realize the uniform current.

The invention provides an auxiliary current transformer and a control method thereof. The auxiliary current transformer comprises an input switch pre-charging unit, an input filtering unit, a preceding voltage increasing unit, two middle frequency isolation DC/DC current transformers, a three-phase inversion unit, an output filtering unit and an external output control unit. The input switch pre-charging unit comprises two pre-charging resistors. The pre-charging resistors are serially connected or parallelly connected with each other. The preceding voltage increasing unit comprises two paths of boost voltage increasing modules. The boost voltage increasing modules are serially connected or parallelly connected with each other. The middle frequency isolation DC/DC current transformers are connected with the boost voltage increasing modules and used for carrying out middle frequency inversion on direct current voltage output by the boost voltage increasing modules to generate middle frequency square-wave voltage and carrying out isolation voltage transformation on the middle frequency square-wave voltage and rectifying the middle frequency square-wave voltage into direct current voltage. The middle direct current voltage output by the middle frequency isolation DC/DC current transformers are parallel connected and then input into a three-phase inversion unit.

The embodiment of the invention provides a power module, a converter and a wind generating set. The power module comprises a double-sided radiator and two IGBT modules which have the same structure and are symmetrically arranged on a front heat-dissipating substrate and a rear heat-dissipating substrate of the double-sided radiator, and is characterized in that the upper end parts of the heat-dissipating substrates are symmetrically provided with two DC positive and negative laminated busbars with the same structure, and each DC positive and negative laminated busbar is connected with a direct-current input terminal of the IGBT module on the same heat-dissipating substrate; convergence parts of the two DC positive and negative laminated busbars are arranged at the side surface of the double-sided radiator; the front heat-dissipating substrate, the rear heat-dissipating substrate and the lower end part of the side surface are provided with AC laminated busbars, and the AC laminated busbars are respectively connected with alternating-current output terminals of the power module; convergence parts of the AC laminated busbars are arranged at the side surface of the double-sided radiator, and impedance parameters corresponding to the structures between the convergence part of each AC busbar in the AC laminated busbars and the part used for connecting two alternating-current output terminals are equal. The scheme provided by the invention can realize convergence and current sharing of the power module.

The invention discloses a hybrid-modulation isolation-type double-path output DC-DC convertor. The convertor comprises an input power supply, a parallel-connection half-bridge LLC resonance circuit and a phase-shift full-bridge circuit; a frequency modulation mode is adopted for converting direct-current input voltage into high direct-current output voltage, and a sub edge is of a whole-wave rectification circuit structure; the phase-shift full-bridge circuit is connected between two bridge arms of the parallel-connection half-bridge LLC resonance circuit, a mode of adjusting the phases of thebridge arms is adopted for converting direct-current input voltage into low direct-current output voltage, and a sub edge is of a whole-wave rectification circuit structure. According to the hybrid-modulation isolation-type double-path output DC-DC convertor, the independence and stability between output of two circuits are improved, and mutual influence of output of two circuits is reduced. Theconvertor controls the output voltage, and stable direct-current voltage output is achieved; meanwhile, the convertor is provided with a high-frequency transformer, and electrical isolation can be achieved.

The invention discloses a high-temperature superconductive current-sharing cable and a current sharing realizing method, and belongs to the technical field of superconducting magnets. According to thecable, high-temperature superconductive belts are wound on a cylindrical metal skeleton, and the cylindrical metal skeleton is of a flexible metal tubular structure of integrated molding, or a multi-core metal wire is bundled and twisted to form a cylindrical skeleton, a thin copper belt is wound around the cylindrical skeleton densely in a spiral manner and serves as a transition layer so as tosmoothen local unevenness; the superconductive belts are wound on the metal skeleton in the spiral manner, and initial points of the superconductive belts are welded to one initial copper electrode; termination points of the superconductive belts are welded to one terminal copper electrode to form a multi-layer superconductive current layer; the metal skeleton plays an internal support role, and can be used for shunting when the superconductive layer has a fault; and a balance inductance design is used in the superconductive current layer, so that current are shared averagely among the different superconductive belts, and the current transmission capability of each superconductive belt is utilized fully.

The invention relates to a mixing and flow-homogenizing structural body, which includes a pore plate flow-homogenizing layer and a foam metal flow-homogenizing layer which are arranged vertically to the gas flow direction. The pore plate flow-homogenizing layer is composed of a pore plate flow-homogenizing layer fixed sheet and a pore plate flow-homogenizing layer movable sheet, which are arranged adjacently to each other. A plurality of flow-homogenizing pores are formed in corresponding positions on both the pore plate flow-homogenizing layer fixed sheet and the pore plate flow-homogenizing layer movable sheet. The pore plate flow-homogenizing layer movable sheet can slide transversally and vertically at short distance, and when the movable sheet slides, the overlapping ratio of the flow-homogenizing pores in the movable sheet and the corresponding flow-homogenizing pores in the fixed sheet is changed. By means of the combined structure of the foam metal flow-homogenizing layer and the pore plate flow-homogenizing layer. The overlapping ratio of the flow-homogenizing pores in the movable sheet and the fixed sheet can be adjusted, thereby greatly improving flow-homogenizing effect. When being used for removal of NOx through ammonia process under large flue gas load status, gas flows and pressures in multiple chambers can be equalized, and gas flow distribution in single chamber is uniform. Meanwhile, mixing uniformity of ammonia gas or a thermal-desorption gas with flue gas is improved.

The invention provides a controllable series compensation device based on parallel connection of double TCR (Thyristor Controlled Reactor) branch circuits and a control method thereof, which belong to the field of controllable series compensation in the field of flexible alternating current power transmission. The controllable series compensation device uses parallel connection of two TCR (Thyristor Controlled Reactor) branch circuits and makes current passing through each TCR (Thyristor Controlled Reactor) branch circuit be smaller, so that the problem that the current thyristor valve has insufficient through-current capability in ultrahigh voltage controllable series compensation is solved. The TCR (Thyristor Controlled Reactor) branch circuit is formed in a manner that two inverse parallel thyristor valves are connected in series with a reactor, and the two TCR (Thyristor Controlled Reactor) branch circuits are connected in series to form a controllable series compensation device; or the two TCR (Thyristor Controlled Reactor) branch circuits are connected in parallel and then are connected in series with a common reactor to form a controllable series compensation device; and the current equalizing and impedance requirements of branch circuits are realized by control of equal circuit amplitudes of the two TCR (Thyristor Controlled Reactor) branch circuits of the series compensation device and control of fundamental wave impedance. The device can meet the requirements of the impedance control, and has simple control process and uses linear control; and the device is easy to realize in engineering, along with good control stability.

The invention discloses a buck circuit silicon carbide power module, and belongs to the technical field of power electronics. The power module comprises a bottom-layer direct bonded copper DBC substrate, and silicon carbide power chips, a driving resistor, power terminals and driving terminals which are mounted on the bottom-layer DBC substrate. The silicon carbide power chips and the driving resistors form two buck half-bridge circuits. The silicon carbide power chips are connected through metal bonding wires. The bottom-layer DBC substrate is welded on a bottom plate. According to the power module provided by the invention, through reasonable DBC copper layer layout, a current conversion loop is optimized, the balance of a parallel chip loop is realized, the parasitic inductance of the loop is greatly reduced, the size of the module is reduced, and the power density of the module is improved.

The invention provides a resonant converter and a current processing method. The resonant converter comprises more than two resonant units, wherein each resonant unit comprises a bridge-type inversioncircuit, a resonant circuit, a transformer, a rectification circuit and a filtering circuit, an input end of the bridge-type inversion circuit is connected with an input end of a DC voltage, an output end of the bridge-type inversion circuit is connected with an input end of the resonant circuit, an output end of the resonant circuit is connected with a first end of a primary side of the transformer, a first output end of a secondary side of the transformer is connected with an input end of the rectification circuit, an output end of the rectification circuit is connected with the filtering circuit, second input ends of primary sides of the transformers of more than two resonant units are connected in a triangular or star mode, and a connection point of the primary sides of the transformers of more than two resonant units is in a suspension state.

The invention provides a power supply system and a power supply control method. The power supply system comprises a plurality of inverters, a plurality of controllers, a plurality of current sensors and a voltage sensor, wherein input ends of the plurality of inverters are connected to a same power supply input end; an output end of each inverter is connected with one current sensor; one current sensor is connected with one controller; the output ends of the plurality of inverters are connected with the same voltage sensor; the voltage sensor is also connected with the plurality of controllers; and one controller is also connected with a control terminal of one inverter and also connected with the other controllers in the plurality of controllers to receive current which is transmitted from the other controllers and detected by the current sensors connected with the other controllers. According to the power supply system and the power supply control method, the inverters connected withthe controllers are controlled and adjusted through the controllers to achieve uniform current among different inverters, so that circulating current is avoided, interruption of power supply is effectively avoided and normal operation of a vehicle is ensured.

The invention provides a control method based on a power supply system and a related device, and relates to the technical field of circuit control. The control method comprises the following steps: respectively acquiring current of each bypass circuit; judging whether the current meets a compensation triggering condition or not based on the current of each bypass circuit; and if the compensation triggering condition is met currently, increasing the compensation circuit current corresponding to each bypass circuit to be adjusted to increase the current input to the corresponding load connectingline by the compensation circuit corresponding to each bypass circuit to be adjusted, thereby reducing the current input to the corresponding load connecting line by each bypass circuit to be adjusted, and improving the adjustment precision. Current sharing of the bypass circuits in the power supply system is achieved, the situation that one part of the bypass circuits are fully loaded and the other part of the bypass circuits are not fully loaded is avoided, and the operation efficiency of the power supply system is improved.

The invention relates to an automatic current equalizing method and device of vibrostand power amplifier. The technical scheme of the invention includes the steps: a digital modulating module and a power amplifying unit are arranged in a control instrument unit; a plurality of current sampling circuits are arranged in the power amplifying unit which are respectively used for detecting the branch circuits outputted by each power amplifying module in the power amplifying unit, and feeding the signals of the branch circuits back to the corresponding power amplifying modules; the power amplifyingunit feeds back a general current signal back to the digital modulating module which works out an average current signal according to the general current signal, and simultaneously receives and implements PWM digital modulation on the output signal of the control instrument unit, and then sends the signal and average current signal after PWM digital modulation to each power amplifying module; each power amplifying module compares the average current signal and the branch current signals, and adjusts the PWM waveform output of each power amplifying module. The invention has simple method and easy device, can greatly reduce the difficulty of debugging construction, as well as stably and precisely realizes the current equalizing of each power amplifying module in the power amplifying unit.

The invention discloses a wide bandgap semiconductor double-sided heat dissipation module packaging structure based on a conductive metal band, semiconductor power chips of different bridge arms are arranged on different power substrates, the size of a module is reduced, and the power density of the module is greatly improved; the power gasket is arranged between the top power substrate and the bottom power substrate, plays a role in mechanical support and electrical connection, provides an additional heat dissipation path for each semiconductor power chip on the basis of double-sided heat dissipation, reduces the thermal coupling degree between the chips, achieves the chip temperature equalization effect, and improves the heat dissipation environment of the chips; the driving loop and the commutation loop are nearly vertical in space, the electromagnetic coupling degree between the loops is greatly reduced, and the reliability of the module is further improved; the commutation loop uses the conductive metal belt to complete electrical connection required by the chip, the parasitic inductance value of the module is greatly reduced, and the source electrode conductive metal belt is provided with a hole groove at the joint, so that the distribution uniformity of the parasitic inductance can be improved, and the current sharing effect of the chip is achieved.

The invention discloses an SCC-based independent dimming multi-path light emitting diode (LED) driving circuit capable of current sharing. The SCC-based independent dimming multi-path LED driving circuit comprises a half-bridge inversion unit X, a front-stage LLC resonant conversion network unit Y, a multi-path LED current-sharing driving unit Z1 and a multi-path LED current-sharing driving unit Z2 which are connected with one another, the multi-path LED current-sharing driving unit Z1 is controlled by a first controllable switch capacitor, the multi-path LED current-sharing driving unit Z2 is controlled by a second controllable switch capacitor, the multi-path LED current-sharing driving unit Z1 controlled by the first controllable switch capacitor is provided with a first current-sharing controllable switch capacitor SCC1, and the multi-path LED current-sharing driving unit Z2 controlled by the second controllable switch capacitor is provided with a second current-sharing controllable switch capacitor SCC2. The SCC-based independent dimming multi-path LED driving circuit has the characteristics of simplicity in structure, low cost, high practicability and the like, is easy to implement, and is easily expanded to an 2n-path application occasion.

The invention discloses a low-power-consumption redundant current sharing circuit based on a PMOS. The invention belongs to the technical field of power electronics. The PMOS-based low-power consumption redundant current sharing circuit can be applied to a load side; current sharing of two power supplies is not required; the requirement on the consistency of the output voltages of the two power supplies is relatively low; according to the circuit, a PMOS is used for applying negative voltage to a gate electrode; the low-resistance on-state characteristic between the drain electrode and the source electrode is realized; and the impedance between the drain electrode and the source electrode is controlled by the gate voltage amplitude. Measures such as a sampling resistor and an operational amplifier are combined; the input impedance of the two power supplies is automatically adjusted; current sharing of the two power supplies is realized; when the local heat of the circuit is too high inthe using process, the insulating liquid is pushed out and sprayed on the outer side of the gasket under the dispersion action of the release holes, and a layer of insulating liquid film is formed between the inner walls of the contact end holes under the action of the capillary fiber thorns, so that the whole circuit is insulated when the local temperature is too high.