931 results about "Current sharing" patented technology

The invention discloses a storage battery capacity attenuation trend prediction method, and belongs to the technical field of storage battery prediction. By collecting voltage, current and temperature data of each monomer in real time and combining historical capacity attenuation and internal resistance growth data, the method identifies a voltage and capacity difference value, evaluates cyclic stress non-uniform distribution, and determines a current sharing proportion and a load unbalance degree. Identifying an abnormal mode of new battery overload and aged battery deep discharge, constructing a mixing abnormal working condition identification mode, if the unbalance degree exceeds the standard, adaptively adjusting the charging and discharging time and the current switching frequency, establishing a load balance control framework, predicting the capacity attenuation rate and the residual cycle index of each monomer, and determining the capacity matching degree and the life matching degree; finally, a comprehensive residual life estimation value and a credibility interval are generated through fusion; the performance balance of the mixed battery pack is remarkably improved, the overall service life is prolonged, and the method is suitable for real-time monitoring of a battery management system.

The invention discloses a low-output-ripple automatic-current-sharing interleaving buck converter and a control method thereof.The converter comprises a main power circuit and an auxiliary compensation circuit, and the main power circuit adopts two interleaving main branches to achieve voltage conversion and energy transmission; automatic current sharing of the circuit is realized through the integrated network switch module and PWM signal control; the auxiliary compensation circuit adopts a current mirror image compensation principle, and adjusts the magnitude of the compensation current by comparing the difference between the output current of the main power circuit and the reference current, so as to effectively suppress the output current ripple; the control method comprises the steps of output voltage monitoring, PI adjustment, duty ratio modulation and a complementary control mechanism, current ripple phase offset is ensured, and the system stability and efficiency are improved. Compared with the prior art, the method has the advantages that the complexity of a control system is reduced, the working efficiency is improved, the current ripples are effectively eliminated, and the method has relatively high practical value and popularization prospect.

The invention belongs to the technical field of semiconductor device packaging, and discloses a power semiconductor module three-dimensional stacking vertical commutation low-inductance packaging structure. The two vertical commutation structures are stacked and integrated on the same substrate; different from traditional two-dimensional packaging in which all elements are laid on a two-dimensional plane, three-dimensional stacked packaging suitable for power devices is proposed for the first time, and power loops are stacked and integrated; the magnetic fluxes of the stacked power loops are cancelled, so that ultra-low inductance (pH level) integration is realized; under the condition that the areas of the substrates are the same, the capacity of the module is doubled; meanwhile, dynamic current sharing design is considered, and one driving chip simultaneously drives eight GaN chips to realize parallel dynamic current sharing for the first time; the method is suitable for various topological structures including half-bridge structures, full-bridge structures, three-level ANPC structures and the like; the method is suitable for various packaging schemes, including PCB on DBC packaging, DBC substrate welding / sintering packaging and embedded packaging. Taking the packaging of the half-bridge module double-sided parallel PCB on DBC as an example, low-inductance, low-thermal-resistance and high-power-density integration is realized.

The utility model discloses an active flow equalizing device of a flow battery system, which relates to the field of flow batteries and comprises a flow battery module and a flow battery capacity unit, the active flow equalizing device of the flow battery system adopts a standardized design, and one flow battery module is provided with two adjustable distributed circulating pumps. Data are collected through temperature, pressure and flow sensors, a battery management system performs analysis according to a big data algorithm, and independent control of each flow battery module is realized on each module, so that the flow of each electric pile in the module is uniform and controllable; when it is monitored that the galvanic piles in the modules run abnormally and are not controlled, the battery management system can close the control valves of the galvanic piles in time and give an early warning, subsequent fault detection is facilitated, and meanwhile normal running of the other galvanic piles is not affected. According to the utility model, stable output of the circulating pump is realized, and the pile charging and discharging efficiency is greatly improved.

The invention relates to the technical field of semiconductors, in particular to an active current sharing strategy for master-slave cooperative control. According to the technical scheme, the system comprises an S < iC > device dynamic current sampling unit, a dynamic current information conversion unit, a dynamic current information processing unit and a variable grid resistance driving circuit, wherein the S < iC > device dynamic current sampling unit is used for collecting real-time current information of the S < iC > device in the turn-on transient process. The method can effectively solve the problem of current imbalance caused by parameter difference of multi-device parallel connection, is especially suitable for parallel connection of three or more modules, guarantees the current sharing effect through fine active current sharing control, adopts a master-slave cooperative control strategy, solves the problem of single-point fault of a main module in traditional master-slave control, and improves the robustness of the system. The device is prevented from being damaged due to excessive current and voltage stress caused by current imbalance, stable operation of the system is guaranteed, current distribution can be effectively adjusted in the load switching process, and stable operation of the system is guaranteed.

The invention discloses a parallel current sharing precision improvement method and system under multiphase heterogenous input. The method comprises the following steps: constructing a current sharing bus signal network; a PI controller is adopted to output a current-sharing adjustment amount VCS to carry out current-sharing loop control, the output amplitude limiting range of the current-sharing loop is set to be 0-+ VCSMAX, and VCSMAX = 2.5% * rated output voltage VOUTNOM; a digital delay compensation technology is added to ensure synchronization of a current-sharing bus network sampling signal and an output current sampling signal; performing moving average filtering on the current-sharing bus network sampling signal and the output current sampling signal after delay compensation by adopting a short-time domain fixed window filtering parameter; a bias error symmetric amplitude limiting mechanism is introduced, a set bias value delta Ihys is subtracted from the original current sharing error, delta Ierrbias = delta Ierr-delta Ihys is used as an effective adjusting signal, and + / -delta Ihys amplitude limiting is applied to delta Ierrbias; an asymmetric integral coefficient adjustment strategy is implemented, when the VCS needs to be increased, a low-speed adjustment coefficient Kup is adopted, when the VCS needs to be reduced, a rapid adjustment coefficient Kdown is adopted, and Kdown is larger than or equal to 2Kup; the steady-state high current sharing precision and the parallel current sharing capability can be realized.

In a first embodiment provided herein, a high voltage and high power module (also referred to as a SuperMOS) comprising SiC MOSFETs that are connected in series and parallel configurations that can operate in concert to one another as, or equivalent to, a single device that could operate in high voltage and high current range. To mitigate mismatch operations due to multiple singled and paralleled devices, the exemplary power module includes both dynamic and static voltage balancing components as well as dynamic current balance circuit comprising a voltage gate clamp that are connected via a secondary parallel connection to ensure concerted dynamic current sharing.

The invention belongs to the field of power semiconductor devices, and discloses a dynamic current-sharing layout design method and system for a multi-chip parallel power module, and the method comprises two aspects of main power loop layout and wiring and driving loop layout and wiring. A main power loop is designed in a vertical commutation manner, and parallel chip source electrodes and drain electrodes are designed in an integrated manner, so that quasi-common-source-electrode inductors of the chips are consistent and integrated, and parallel dynamic current sharing of multiple gallium nitride chips is facilitated; wiring of the driving loop is in vertical commutation and is vertical to the main power loop, mutual inductance of the power loop to the driving loop is basically zero, and parallel dynamic current sharing of gallium nitride chips is facilitated; when the design is met and grid leading-out ends and Kelvin source leading-out ends of the four chips are symmetrical about the symmetry axis of the main power loop, the mutual inductance of the main power loop to a part of wiring from a drive to each chip grid is equal, and the mutual inductance of the main power loop to a wiring from a Kelvin source to a drive ground of each chip is also equal. And an excellent gallium nitride multi-chip parallel dynamic current sharing effect can be realized.

The invention relates to the technical field of power supplies, in particular to a module power supply for communication equipment, which comprises an input filtering unit, at least two stages of power conversion units, an output voltage stabilization unit, an intelligent control module, a fault reconstruction unit and a composite heat dissipation structure, the input filtering unit is connected with the power conversion unit, the power conversion unit is connected with the output voltage stabilization unit, the output voltage stabilization unit is connected with a load end, and the input filtering unit, the power conversion unit, the output voltage stabilization unit, the fault reconstruction unit and the composite heat dissipation structure are respectively connected with the intelligent control module. The composite heat dissipation structure comprises a metal heat conduction substrate, a phase change material layer and a micro-channel liquid cooling module, the phase change material layer is arranged on the metal heat conduction substrate, the micro-channel liquid cooling module is arranged on the phase change material layer, and the metal heat conduction substrate is connected with the power device through heat conduction silica gel for heat conduction; when the fault reconstruction unit detects local failure, the damaged module is switched to be in a bypass state, current sharing parameters of the remaining modules are reconfigured, and the output power of the power supply is maintained to be not lower than 75% of a rated value. Compared with the prior art, the module power supply for the communication equipment has high-efficiency conversion and wide adaptability, and the efficiency is optimized in a full-load range; intelligent thermal management and reliability are enhanced, temperature rise control is obviously optimized, the phase change material layer absorbs transient thermal shock, temperature fluctuation is reduced, flow of the micro-channel liquid cooling module is adaptively adjusted, and power consumption is reduced; dynamic performance and stability are improved, multi-module parallel current sharing precision is improved, circulating current loss is reduced, and faults can be rapidly recovered.

The invention discloses a circuit and a method for realizing current sharing through master-slave parallel connection, and the method is characterized in that a master machine and a plurality of slave machines are connected in parallel, and are respectively connected to a current sharing control bus through an isolation chip, a TTL and differential mutual conversion unit and an information gating switch in sequence, thereby forming a parallel current sharing circuit; comprising a host issuing current reference circuit and a processing circuit after a slave receives a current reference signal from the host. After a plurality of instrument power supplies are connected in parallel, a user sets a master-slave parallel mode on a front panel of the power supplies and selects a master computer, and other computers are slave computers; when a plurality of power supplies work in parallel, the host issues a current reference signal to the current sharing control bus through the current reference generation circuit, and the slave outputs a corresponding current value according to the current reference signal issued by the host. One of a plurality of power supply modules can be randomly selected as a main module, the flexibility is high, the stability is good, and the power supply has the characteristics of simplicity in wiring and control, low transmission loss of control signals, difficulty in interference of the control signals, balanced output control of all the power supply modules and the like.

The invention provides a self-adaptive current sharing control method, system and device and a medium. The control method comprises the following steps: acquiring output voltage and output current of each LLC module connected in parallel; subtracting the output voltage of each LLC module from the voltage reference value to obtain a first error signal; subtracting the output current of each LLC module from the current reference value to obtain a second error signal; according to the first error signal and the second error signal, a duty ratio control signal and a frequency control signal are generated through a double-feedback channel; and finally, based on the duty ratio control signal and the frequency control signal, dynamically selecting or superposing a PWM control mode and a PFM control mode to generate a driving signal, and adjusting a switching tube of each LLC module through the driving signal, thereby realizing uniform distribution of output current, ensuring stable output voltage, avoiding the situation that a single module bears all loads, and improving the reliability of the system. The service life of power devices is prolonged, and the overall operation reliability of the system is improved.

The invention discloses a control method of an interleaved parallel bidirectional DCDC converter. A circuit of the converter comprises three pairs of MOSFET switch tubes, three inductors and an output capacitor. The phase difference of PWM waves of the three pairs of MOSFET switch tubes is 120 degrees, and the phase difference is used for effectively reducing current ripples through staggered complementation of currents of all phases. Double closed-loop control is adopted, the DSP chip is responsible for current inner loop control, and the FPGA chip is responsible for voltage outer loop and power outer loop control. The current sharing precision is high, through flexible configuration of multiple proportionality coefficients and zero points, input fluctuation and load abrupt change interference can be accurately restrained, oscillation is avoided, stable output is ensured, and when load abrupt change or mode switching is carried out, output can be rapidly adjusted, transition time can be shortened, and overshoot can be reduced. And high dynamic response and strong robustness of the system are realized, so that complex and changeable application requirements are met.

The invention discloses a multi-tube parallel power device phase shift type current sharing and crosstalk suppression drive circuit which is composed of a crosstalk suppression unit, a current balancing unit, a control response unit and a function switching unit. Wherein the crosstalk suppression unit generates a control signal for suppressing the crosstalk voltage of the parallel power device and shields the interference of the current balancing unit; the current balancing unit generates a control signal for balancing the dynamic current of the parallel power device and shields the interference of the crosstalk suppression unit; the control response unit is used for realizing crosstalk active clamping or current active equalization; and the mode switching unit realizes automatic switching of a crosstalk suppression function or a current equalization function according to configuration. Parallel device grid driving signal feedback is introduced, crosstalk voltage active clamping and dynamic current active balancing are achieved through a logic circuit, and the parallel expansibility is high; an exclusive-OR gate is adopted to accurately identify synchronous or asynchronous information of driving signals of the parallel devices, and various different gate sequential modes in parallel application of the hybrid devices can be compatible.

The invention relates to the technical field of packaging, in particular to a double-end power supply and double-face heat dissipation packaged parallel half-bridge power module, which is characterized in that a SiC MOSFET chip and a diode chip are arranged between an upper DBC board and a lower DBC board, the bottom ends of the SiC MOSFET chip and the diode chip are connected with the lower DBC board through solder layers, and the lower DBC board is connected with the lower DBC board through solder layers. The top end of the SiC MOSFET chip and the top end of the diode chip are respectively connected with a conducting strip through a solder layer, and the conducting strip is connected with the upper DBC board through the solder layer. According to the invention, the two DBC boards and the buffer conducting strip realize electrical connection of all parts in the module, so that the whole packaging structure of the module is simplified; two-sided heat dissipation of the SiC MOSFET and the diode chip is realized through the copper-clad layers arranged on the surfaces of the two DBC boards, the problem of heat flow concentration of the SiC chip under the high-frequency working condition is effectively solved, and the problem of'heat-electric stress' coupling of the module under the high-frequency working condition is solved through system coupling current balance and two-sided heat dissipation capability, so that the module has multi-unit self-current-sharing, and the service life of the module is prolonged. The high-frequency switch stress is inhibited and balanced; and the power density is improved.

The invention relates to the field of electrical engineering, and discloses a high-luminous-efficiency LED street lamp based on multi-chip combination and a luminous flux improving method thereof, and the method comprises the steps: obtaining photoelectric parameter data, carrying out the classification modeling of chips, and constructing a light source feature database; self-adaptive parameter extraction is carried out on the light source feature database, a cooperative work model is constructed, the chip load state is adjusted through a current sharing control strategy, and the chip heat distribution change condition is monitored in real time; whether the working state is stable or not is judged based on the heat distribution change condition, and if the working state is stable, stage change data of luminous flux output is recorded, and a chip driving strategy is corrected; according to the corrected chip driving strategy, spatial distribution regulation and control and energy efficiency optimization are carried out on output luminous flux, regulation factors are extracted, a light emitting path and heat dissipation intensity are adjusted, and luminous efficiency balance improvement is carried out; and evaluating the luminous flux output effect based on the luminous efficiency balance improvement result, and generating a working state evaluation report and a luminous flux improvement suggestion.

The invention discloses a deep-sea robot driving motor current-sharing heat balance method, which comprises the following steps of S1, constructing a differential equation set for describing input and output characteristics of a motor, and covering mechanical and electrical parts; s2, measuring the current and the rotating speed of each armature in real time, and calculating a current difference value; s3, constructing a parameter matrix and a solution matrix for calculating a control gain, and establishing a weight matrix and an adjustment coefficient for dynamically calculating a control signal; s4, updating the control weight matrix in real time according to the current difference value, iteratively updating the solution matrix, calculating a control voltage signal and applying the control voltage signal to each armature; the current-sharing heat balance method is based on the current signals of the armatures of the motor, the deviation signals are calculated, the control voltage is dynamically adjusted, it is ensured that the rotating speed of the motor accurately tracks the target signals, it is also ensured that currents of the armatures tend to be the same, heat balance between the armatures is achieved, and stable operation of the motor is ensured.

The embodiments of the present disclosure provide a synchronous rectifier module, comprising: a transformer provided with a plurality of secondary windings, a first circuit board and a second circuit board disposed on opposite sides of the transformer, and a first connecting piece electrically connected to the first circuit board and a second connecting piece electrically connected to the second circuit board; the first connecting piece and the second connecting piece comprise current sharing portions connected to the first circuit board and the second circuit board respectively, and inductor portions which penetrate an inductance core side by side to form an output inductor, resistance values of the current sharing portions of the first connecting piece and the second connecting piece being equal or a resistance difference value therebetween being within a preset range. The present disclosure can quickly, accurately and conveniently improve the efficiency and the heat dissipation of the synchronous rectifier module, and achieve a better current sharing effect of the connecting pieces by adjusting the resistance value numerical range of the two connecting pieces.

The invention discloses a parallel double-fracture collaborative breaking structure and method of a vacuum circuit breaker, and belongs to the technical field of circuit breaker structures. The structure comprises a spring operating mechanism, a current sharing mechanism, a transmission mechanism and a double-fracture circuit breaker assembly; the spring operating mechanism is arranged outside a sealed gas box of the gas insulated switchgear, and the spring operating mechanism is connected with the current sharing mechanism and drives the current sharing mechanism to move; the transmission mechanism comprises an upper motion guide rod and a lower motion guide rod, one ends of the upper motion guide rod and the lower motion guide rod are connected with the current sharing mechanism, the other ends are connected with the double-break circuit breaker assembly, and the motion consistency of the transmission mechanism is driven and controlled through the current sharing mechanism; the double-break circuit breaker assembly is connected with the transmission mechanism, and the transmission mechanism drives the double-break circuit breaker assembly to move and is used for switching on and switching off the vacuum circuit breaker switch. According to the invention, the current nonuniformity of the parallel multi-break vacuum circuit breaker in the opening and closing process can be effectively and structurally reduced, and the safety and reliability of power grid operation are improved.

The invention provides a power module, a power supply system, a vehicle and a photovoltaic system, the power module comprises a first metal layer-coated substrate, a plurality of chips and a first connecting sheet, a first electrode of each chip is electrically connected with a first metal layer of the first metal layer-coated substrate, the first connecting sheet comprises a first main body part and a plurality of first contact parts, and the first main body part is electrically connected with the plurality of first contact parts. The second electrode of each chip in the plurality of chips is in contact with at least one first contact part, and a part of the first main body part is arranged between at least one pair of adjacent first contact parts. Current flowing out of the chips can directly flow into the first main body part through the first contact parts, current flowing paths are reduced, the chips are connected in parallel through the first connecting pieces, the parasitic inductance of the power module can be reduced, and the current sharing performance of the power module can be improved.

The invention relates to the technical field of power cables, and discloses a parallel power cable current sharing optimization method and device based on a magnetic ring current equalizer, and the method comprises the steps: carrying out the simulation of a three-dimensional finite element model, and determining first simulation impedance; obtaining an equivalent circuit model, determining theoretical impedance according to the equivalent circuit model, and determining current impedance according to the theoretical impedance and the first simulation impedance; obtaining an electromagnetic field coupling model, determining a magnetic ring compensation parameter, and simulating the electromagnetic field coupling model according to the magnetic ring compensation parameter and the current impedance to determine an impedance compensation mapping relation; and determining an impedance compensation sensitivity matrix according to the impedance compensation mapping relation, and setting values of magnetic ring compensation parameters so as to perform current sharing optimization on the parallel power cables. According to the invention, the mapping relation between the magnetic ring compensation parameter and impedance compensation of the magnetic ring current equalizer can be quantified, thereby accurately generating an optimal compensation scheme, greatly improving the reliability of the parallel power cable, and facilitating the realization of power transmission safety.

The invention provides a current sharing method for multiple power supply racks, which can be applied to the technical field of server power supply current sharing. The current sharing method comprises the following steps: a master controller detects the number of first current power supply units in a plurality of first power supply units and a first total current output quantity, receives the number of second current power supply units in a plurality of second power supply units from a slave controller and a second total current output quantity, and determines a current mean value, a current-sharing signal including a current average value is synchronously issued to the master controller and the plurality of slave controllers; the main processor detects a heartbeat signal of the main controller, controls the first switch module to disconnect the electric connection between the main controller and the plurality of first power supply units and controls the second switch module to disconnect the electric connection between the main controller and the fourth switch module under the condition that the heartbeat signal is not detected within a preset time period; and the second switch module is electrically connected with the plurality of first power supply units and the fourth switch module so as to realize the function of the main controller.

The present invention discloses an inverter parallel system and a zero-sequence current control method thereof. The inverter parallel system comprises a plurality of inverters which are connected in parallel and connected to a load; the inverter parallel system also comprises a first current acquisition unit, a first voltage acquisition unit, and a drive control unit. The inverter comprises a main control unit, and the drive control unit comprises a reference value acquisition unit, a first controller, a second controller, and a coordinate conversion unit. Communication transmission is performed between the inverters, and the average output current DC component of each inverter is used as a reference quantity of the zero-sequence current loop of the current inverter to effectively suppress the zero-sequence circulating current and realize current sharing control under different load conditions.

The invention provides a current sharing device, a current sharing control method and electronic equipment, and belongs to the technical field of computers, and the current sharing device comprises a current sharing module which is connected with a power supply and a power utilization assembly, and comprises at least two target transmission channels, and the current sharing module is used for distributing corresponding channel transmission current to each target transmission channel based on the input current of the power supply, each target transmission channel is used for transmitting current to the power utilization component transmission channel, and the target transmission channels are mutually independent. According to the current sharing module, the input current can be uniformly distributed to each target transmission channel, uniform receiving and uniform distribution of the current are realized, current overload of a certain transmission channel is avoided, and the overall safety is improved.

The invention relates to an IGBT parallel current sharing control circuit and method for turn-off transient current change rate detection, and the circuit employs a PCB Rogowski coil probe to carry out the non-contact detection of the turn-off current change rate of a parallel device, thereby accurately judging the non-current sharing characteristic of the parallel device. The problem of integrated design of a traditional detection scheme in large-current and high-power-density application is effectively solved; meanwhile, by designing a current change rate peak holding circuit, the holding time of a peak signal is remarkably prolonged, and the performance requirement on the ADC sampling rate is greatly reduced; a reset branch is additionally arranged for the peak holding circuit, and the peak output value in the last period is zeroed in the turn-on transient state by using a driving signal, so that the charge accumulation effect is effectively eliminated, and the sampling precision of the system is guaranteed; the regulation and control part of each parallel branch only needs to be additionally provided with two passive elements including the control switch and the capacitor, current sharing control can be achieved by adjusting the access time of the bypass branch, the structure is simple, cost is low, and good popularization applicability is achieved.

The invention provides an anti-surge-voltage planar gate silicon carbide VDMOS and a preparation method thereof, and the method comprises the steps: depositing metal on the lower side surface of a silicon carbide substrate, and forming a drain metal layer; epitaxially growing on the upper side surface of the silicon carbide substrate to form a drift layer; forming a barrier layer on the drift layer, and performing etching and ion implantation to form a protection region, a current sharing region, a second P-type well region, a Schottky region, a first P-type well region and a lug boss; a barrier layer is formed again, etching and ion implantation are carried out, and an N-type source region is formed; forming a barrier layer again, etching and depositing to form an insulating medium layer; forming a barrier layer again, etching and depositing metal, and forming a gate metal layer; the method comprises the following steps: preparing a source electrode metal layer, re-forming a barrier layer, etching, depositing metal, forming a source electrode metal layer, removing the barrier layer, and completing preparation. The reliability of the device is improved, the conduction loss of the device is reduced, and the surge voltage resistance is improved.

The embodiment of the invention provides a current sharing control method and an AC-DC conversion system, the current sharing control method is applied to a current sharing controller, the current sharing controller is used for controlling the working state of an AC-DC converter, the AC-DC converter comprises at least two rectification units, and the at least two rectification units adopt a combination of a bridge topology structure and an LLC resonant tank; comprising the steps of determining a target adjustment phase according to absolute values of three-phase input voltage instantaneous values of at least two rectification units; according to the current sampling values of the at least two rectification units, a target duty ratio of a target adjustment phase in each rectification unit is determined, and the target duty ratio is used for indicating adjustment of the voltage gain of the LLC resonant tank; and adjusting the duty ratio of the control signal of the switching tube in each rectification unit according to the target duty ratio of the target adjustment phase in each rectification unit. According to the embodiment of the invention, the gain of the LLC is changed by adjusting the pulse width of the switching tube control signal in the rectification unit and adjusting the amplitude distribution of the input voltage of the resonant tank, so that the output current of the LLC is controlled, and the purpose of current sharing is achieved.

The utility model relates to the technical field of power modules, and provides a half-bridge power module, an inverter and a vehicle. The half-bridge power module comprises an insulating substrate, an upper bridge arm, a lower bridge arm, a first coating, a second coating and a third coating, the upper bridge arm comprises a plurality of first upper switch tubes and a plurality of second upper switch tubes, and the lower bridge arm comprises a plurality of first lower switch tubes and a plurality of second lower switch tubes; the first upper switch tubes and the second upper switch tubes are respectively arranged on the first coating layer, and the first lower switch tubes and the second lower switch tubes are respectively arranged on the second coating layer; the source electrodes of the first upper switch tubes are connected, the source electrodes of the second upper switch tubes are connected, the source electrodes of the first lower switch tubes are connected, and the source electrodes of the second lower switch tubes are connected. According to the scheme, the source electrodes of any group of parallel switching tubes are connected, so that the problem of relatively large interconnection inductance between the switching tubes can be avoided, and the effects of improving the current sharing characteristic of the half-bridge power module and reducing the possibility of oscillation are achieved.

An automatic current sharing control method for an interleaved BUCK converter belongs to the technical field of power electronics, and comprises the following steps: step S1, obtaining an output voltage and a given output voltage of a load end of the interleaved BUCK converter; obtaining the current of each phase of inductor; s2, obtaining an average value of the inductive current of each phase, and averaging the average value of the inductive current of each phase as a reference value of a current loop; s3, calculating a duty ratio signal through a current loop; s4, calculating a duty ratio signal through a voltage loop; and S5, superposing the duty ratio signal of the current loop operation of each phase with the duty ratio signal of the voltage loop operation. According to the invention, the inductive current of each phase follows the average inductive current of three phases in real time, high-precision current-sharing control is realized, and the control reliability is improved, so that the output current is controlled at an average level.

The invention relates to the technical field of multi-column lightning arresters, in particular to a multi-column lightning arrester parallel matching method, which comprises the following steps of S1, performing aging screening and energy tolerance testing on zinc oxide resistor discs of the same batch; s2, measuring the direct-current reference voltage Uref of the resistor discs, the leakage current I0 under 0.75 Uref, the impact residual voltage UL under the lightning wave and the operation residual voltage US under the operation wave one by one; s3, screening the resistor discs for three times; and S4, high-low matching is carried out by taking the operation residual voltage US as a main matching basis, so that the operation residual voltage deviation of each column of series resistor disc group is smaller than a first preset value, and the direct current reference voltage numerical value deviation is smaller than a second preset value. The strict screening process ensures the consistency of the performance of the resistor discs, and the reasonable grouping mode makes the electrical performance of each column resistor disc group more balanced, thereby achieving the effect of improving the operating wave endurance capability and the current sharing characteristic of the multi-column lightning arrester, and reducing the probability of faults caused by uneven current distribution of the MOV.

The invention provides a direct-current boost collection converter of an offshore wind power full-direct-current sending-out system, and the converter can quickly suppress residual direct-current fault current, so that quick direct-current fault isolation is realized by utilizing a direct-current switch. And the fault clearing time is obviously shortened from about 500ms to below 14ms, so that rapid system recovery is realized. The working principle of the topology under the conditions of normal operation and direct-current fault is elaborated, and enhanced power equalization control is provided, so that direct-current voltage and current equalization among sub-modules of the topology is realized. In addition, after interleaving control is adopted, the number of direct-current reactors of the topology is remarkably reduced. A simulation result verifies the effectiveness of the hybrid DC / DC converter and the control scheme thereof in the aspects of blocking fault residual current and promoting direct current fault ride-through by using the DCS.