1136 results about "Current sharing" patented technology

The invention relates to the technical field of energy storage batteries, and discloses a yacht energy storage battery internal short circuit detection method, device and equipment and a medium, and the method comprises the steps: sampling the voltage and current of a yacht energy storage battery pack, and obtaining original sampling data; performing parameter identification to obtain RC network dynamic response data; performing sliding window Fourier transform and wavelet packet decomposition to obtain a target feature vector; performing voltage abrupt change feature judgment, current abrupt change feature judgment and impedance spectrum feature judgment based on the target feature vector to obtain a multi-stage fault judgment result; starting the three-ring nested control structure and inputting the three-ring nested control structure into a PWM modulation unit to obtain a control compensation signal; the control compensation signal is input into the current sharing controller, the PWM duty ratio of the parallel branches is adjusted, and a current sharing control signal is obtained, the reliability of fault detection is improved, cooperative control of state protection, power balance and current tracking is achieved, and the current distribution problem of the parallel branches is effectively solved.

The invention provides a high-reliability 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; a barrier layer is formed, etching and ion implantation are carried out, and a current sharing layer, a body region, a P-type well region and an N-type source region are formed; forming a barrier layer again, etching and depositing to form an insulating medium layer; a barrier layer is formed again, and etching and deposition are carried out to form a gate dielectric layer; the preparation method comprises the following steps: forming a barrier layer again, etching, depositing metal, forming a gate metal layer and a source metal layer, removing the barrier layer, and completing the preparation. The gate reliability of the device can be effectively improved, and the follow current loss and reverse recovery speed of a body diode can be effectively improved.

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.

Power converters including electronic-embedded transformers for current sharing and load-independent voltage gain are described. An example power converter system includes an input, an output, a power converter between the input and output, and a controller. The converter includes a first bridge, a second bridge, and an electronic-embedded transformer between the first and second bridge. The electronic-embedded transformer includes a bidirectional coupling switch bridge. The controller generates drive control signals for quasi-trapezoidal current modulation control of the bidirectional coupling switch bridge. The controller is configured to generate the drive control signals based on a commutation coefficient k and a switching frequency for the power converter. The commutation coefficient k can be set based on an inductance in the electronic-embedded transformer, a capacitance in the bidirectional coupling switch bridge, and a margin for resonant current commutation.

Power converters including electronic-embedded transformers for current sharing and load-independent voltage gain are described. An example power converter system includes an input, an output, a power converter between the input and output, and a controller. The converter includes a first bridge, a second bridge, and an electronic-embedded transformer (EET) between the first and second bridge. The EET includes a capacitor and a capacitance coupling switch bridge. The controller generates phasing drive control signals for trapezoidal current modulation control of the capacitance coupling switch bridge of the EET. The controller is configured to generate the phasing drive control signals based on a phase shift coefficient, k, to set a duty cycle of a voltage from the capacitance coupling switch bridge. The controller is also configured to vary k from between 0 to 0.5 based on a load applied to the power converter system or other operating aspects of the power converter.

A conversion control circuit controls plural stackable sub-converters which are coupled in parallel to generate an output power to a load. The conversion control circuit includes a current sharing terminal and a current sharing circuit. A current sharing signal is connected, in parallel, to the current sharing terminals. The current sharing circuit includes: configuration (1): the current sharing signal is generated only according to an inductor current corresponding to one of plural inductors of the plural stackable sub-converters; or configuration (2): the current sharing signal is generated according to plural inductor currents corresponding to plural inductors of plural activated phases of the plural stackable sub-converters, wherein a ratio of a portion of the current sharing signal generated by a master control circuit to a portion generated by one of the slave control circuits is k which relates to a difference between a total phase number and an activated phase number.

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 provides a quasi-super junction 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; performing epitaxial growth on the upper side surface of the silicon carbide substrate to form a drift layer; forming a barrier layer, etching, performing ion implantation, forming a plurality of N-type body regions and a plurality of diffusion regions, and forming a P-type well region, an N-type source region and a current sharing layer; re-forming a barrier layer, etching the barrier layer to form a through hole, and depositing to form a gate dielectric layer; a barrier layer is formed again, the barrier layer is etched to form a through hole, metal is deposited, and a gate metal layer is formed; the preparation method comprises the following steps of: re-forming a barrier layer, etching the barrier layer to form a through hole, depositing metal, forming a source metal layer, removing the barrier layer, and completing preparation, so that a quasi-super junction structure and a current sharing layer are constructed in the device, and the voltage endurance capability, the gate reliability and the conduction capability of the device can be effectively improved.

The utility model provides a switch network unit for plasma breakdown of a nuclear fusion magnet power supply, which is connected in series between a power supply and a magnet load, and comprises an input connection bar which is arranged on a bottom plate and is connected with the power supply; the output connecting bar is installed on the bottom plate and connected with a magnet load, the input connecting bar and the output connecting bar are arranged on the two sides of the insulating layer, the projections of the input connecting bar and the output connecting bar on the insulating layer are overlapped, and currents in the input connecting bar and the output connecting bar on the two sides of the insulating layer are equal in magnitude and opposite in direction; the commutation switch network comprises a plurality of commutation switches which are connected in parallel between the input connection bar and the output connection bar; and the current-limiting resistor is connected in series between the input connection bar and the output connection bar and is connected in parallel with the commutation switch. The currents flowing through the symmetrical parts on the two sides of the insulating layer are equal in magnitude and opposite in direction, so that magnetic fields generated by the currents are offset, stray inductance can be effectively reduced, and the current sharing effect of each converter switch is improved.

The invention relates to an LED light source brightness homogenization control method, device and equipment. The method comprises the following steps: acquiring driving current, PWM duty ratio and light intensity signals of each LED unit in an LED array, and establishing an LED characteristic data set; carrying out working state feature extraction to obtain LED working state data, and inputting the LED working state data into an LED brightness prediction model to carry out light intensity value prediction to obtain a predicted light intensity value; performing spectral analysis and resampling calculation on the predicted light intensity value and the actually measured light intensity value to obtain a state judgment result of the LED unit; dividing the LED array into a plurality of driving groups, and performing current sharing control on each driving group through energy adjustment of an energy storage capacitor to obtain an LED driving current parameter; and performing compensation region division on the LED array to obtain a plurality of compensation regions, and performing calculation through a BSA algorithm to obtain a brightness homogenization compensation parameter of each compensation region. According to the invention, the overall display quality and operation reliability of the LED array are improved.

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 utility model discloses a low fluctuation power supply parallel operation equipment, including n power supply modules and load connection terminal, each power supply module includes user input, power conversion, acquisition, CAN communication module and MCU module, the power supply interface of each power supply module is connected with the load connection terminal through a flexible wire, and the power supply modules are in communication connection through a CAN bus. One of the n power supply modules is set as a host, the other power supply modules are set as slaves, and each power supply module adjusts output voltage to enable the voltage to be equal to Vset and collects real-time current data; the slave computer transmits data to the host computer, the host computer receives the data, calculates a current sharing reference and sends the current sharing reference to the slave computer through a bus, and each power supply module calculates and obtains a new voltage stabilization value Vnew according to the current sharing reference and a set Vset. Compared with the prior art, the utility model has the advantages of reducing system oscillation, improving voltage stability and reducing equipment cost.

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 proposes a circuit breaker power module layout optimization method and system based on multi-chip current sharing, and relates to the technical field of power electronics, and the method comprises the steps: collecting parasitic parameters of a circuit breaker power module, and constructing a first switch transient circuit model according to the parasitic parameters; constructing a conduction transient process circuit based on the first switch transient circuit model and the conduction transient characteristics; performing current equalization on the conducted transient process circuit according to the common-source inductance compensation function so as to perform state updating on the conducted transient process circuit, and obtaining a second switch transient circuit model corresponding to the conducted transient process circuit after state updating; extracting a parasitic inductance parameter in the second switch transient circuit model by adopting an ANSYS Q3D simulation tool, and performing multiple iterative optimization on the copper layer shape and the copper layer size of each power tube in the second switch transient circuit model through finite element simulation according to the common-source inductance compensation function and the parasitic inductance parameter; and obtaining an optimized layout scheme of the circuit breaker power module. According to the invention, the problem of local overload caused by non-uniform current distribution can be avoided, and the current sharing degree of the device under the condition that multiple chips are connected in parallel can be improved.

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.

A smart variable inductor based on magnetorheological materials comprises an "EE"-shaped iron core, two DC control coils, one AC coil, and a magnetorheological material gap. The magnetorheological material gap is located on the central column of the "EE"-shaped iron core. The two DC control coils and the AC coil are wound around the two side columns and the central column of the "EE"-shaped iron core, respectively. By controlling the DC current in the DC control coil, the magnetic saturation of the side columns can be changed, thus achieving intelligent wide-range adjustment of the inductance of the AC coil. The beneficial effects of this patent are: the provided smart variable inductor based on magnetorheological materials, due to the higher permeability of magnetorheological materials than air, which decreases with increasing magnetic field strength, has advantages such as a wide inductance adjustment range and low diffusion flux. When used in LLC resonant converters, it can achieve intelligent wide-range adjustment of input / output voltage and load, as well as intelligent current sharing control in multi-parallel converters.

The invention discloses a direct-current transformer power self-balancing control system, which belongs to the technical field of direct-current self-energy taking under a direct-current power distribution network, and comprises a plurality of flyback converters, and a master-slave control framework is formed by taking the actually grounded flyback converter as a master module and taking other flyback converters as slave modules; the main module controls an MOS tube in the main module to be switched on or switched off according to the reference duty ratio; and the slave module controls on or off of an MOS tube in the slave module according to the reference duty ratio and the duty ratio correction. The master module adopts a system output voltage loop to maintain the stability of the system output voltage, the slave module input stage adopts an input grading ring to realize the sharing of the input voltage between flyback modules, and the slave module output stage adopts an output current sharing ring to improve the dynamic response effect of the system. The system can solve the problem of power distribution imbalance caused by inconsistent parameters between flyback modules.

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 provides a silicon carbide VDMOS with high drain voltage overshoot resistance 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 region; performing ion implantation on the drift region to form a first N-type region, a first drift layer and a second drift layer; a barrier layer is formed, etching and ion implantation are carried out, and a P-type well region, an N-type source region and a second N-type region are formed; re-forming a barrier layer, etching to form a second through hole, and depositing to form an insulating layer; a barrier layer is formed again, and a gate dielectric layer is formed through etching and deposition; and re-forming a barrier layer, etching, depositing metal, forming a gate metal layer and a source metal layer, and removing the barrier layer to complete preparation. The impact of drain voltage overshoot on the grid is inhibited; current from a body diode and a conducting channel of the device is equalized, heat concentration is avoided, and the reliability of the device is improved.

The invention discloses an inverter parallel current sharing control method based on virtual reactive voltage self-adjustment, and belongs to the technical field of coordination control of parallel inverters. Compared with traditional droop control, the reactive power equalization degree can be well improved, and the reactive power equalization effect and the response speed when the load power changes are enhanced. According to the invention, the relation between the output power and the output impedance of the inverter is deeply analyzed, the characteristics of loop chain control and traditional droop control are combined, and a reactive loop chain and self-adjusting virtual reactive voltage control are introduced, so that the virtual impedance can realize self-adaptive adjustment according to circular chain type tracking of reactive power output by a parallel module; mismatch between output impedances of the parallel modules is compensated, and output reactive power balance of the parallel modules is achieved. In addition, the voltage of a common coupling point does not need to be measured, the requirement for a communication network is low, the system reliability and safety are higher, and good reference value is provided for engineering application.

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 technical field of driving circuits, in particular to a parallel current-sharing digital closed-loop active driving system, which comprises a switching tube circuit, a parallel current-sharing circuit and a parallel current-sharing circuit, the current sampling conditioning circuit obtains a switching voltage; the quiescent current identification circuit performs quiescent current identification; the dynamic current identification circuit carries out dynamic current identification; the static current-sharing closed-loop control circuit generates pulse width modulation waveforms with different duty ratios according to the static current; the dynamic current-sharing closed-loop control circuit generates pulse width modulation signals with different phases according to the dynamic current; the driving power supply adjusting circuit generates different driving voltages for the driving circuit according to the pulse width modulation waveforms with different duty ratios; the driving circuit outputs different driving voltages according to the pulse width modulation signals of different phases, and the driving voltages are used for controlling the switching current of the switching tube circuit to carry out closed-loop adjustment and dynamic and static current equalization. The problem that an existing driving circuit cannot meet parallel current sharing, steady-state current and rapid closed-loop adjustment at the same time is solved.

The invention discloses a staggered PFC circuit control method, a control device and a switching power supply. The control method comprises the following steps: acquiring a first voltage sampling signal representing the magnitude of current flowing through a first power loop and a second voltage sampling signal representing the magnitude of current flowing through a second power loop; the operational transconductance amplifier generates an error current according to a difference value between the first voltage sampling signal and the second voltage sampling signal, and then the filter circuit filters the error current to obtain a current-sharing compensation voltage signal; generating a first power loop driving pulse width modulation signal; and generating a second power loop driving pulse width modulation signal under the regulation of the current-sharing compensation voltage signal, increasing the duty ratio of the second power loop driving pulse width modulation signal when the current-sharing compensation voltage signal is greater than the set threshold voltage, and otherwise, reducing the duty ratio of the second power loop driving pulse width modulation signal. On the basis of reducing the number of the peripheral pins of the IC, the problem of non-uniform current in staggered application can be effectively solved.