15results about How to "Good current equalization effect" patented technology

The invention provides a screening method for parallel current sharing of power semiconductor chips and electronic equipment, and the method comprises the steps: obtaining chip parameters corresponding to each power semiconductor chip, sorting the plurality of power semiconductor chips according to the plurality of chip parameters, and obtaining a chip combination, the chip parameters are parameters representing the characteristics of the power semiconductor chip; circuit parameters corresponding to all branches in the power module are obtained, the multiple branches are sorted according to the multiple circuit parameters, a branch combination is obtained, and the circuit parameters are parameters representing the characteristics of the branches; and connecting the power semiconductor chips in the chip combination into the branches in the branch combination in sequence to obtain a target power module. According to the method and the device, the problem of low chip utilization rate caused by the fact that the threshold voltage of the chip is required to be consistent in a chip screening method based on threshold voltage consistency in the prior art is solved.

The present invention discloses a high temperature load test system for a precise multi-channel current-sharing capacitor, which belongs to the technical field of capacitor high temperature load test, and includes a power module, a plurality of current transformers, a plurality of groups of capacitors to be tested, and a plurality of control switch units. The present invention adopts the secondaries of more than two current transformers to be connected in series and form a loop, so that the current of the primary in the current transformer is consistent. At the same time, since the secondary of the current transformer forms a loop, the current transformer works in a short-circuit state, and the induced voltage at the primary is very small, resulting in very small power consumption of the current transformer, greatly reducing the copper loss and iron loss of the current transformer, making the primary-secondary current ratio of the current transformer more accurate, the current-sharing effect better, and the energy loss smaller.

This utility model relates to a gas cooling and scrubbing tower, belonging to the field of gas purification technology. It includes a tower body, an air inlet, an air outlet, and a liquid outlet, located on the side, top, and bottom of the tower body, respectively. Between the air inlet and outlet within the tower body's internal cavity, a first spray device, a uniform flow water curtain layer, and a second spray device are sequentially arranged from bottom to top. The uniform flow water curtain layer includes a uniform flow water curtain baffle, and a water curtain regulating component is arranged above the baffle. This utility model utilizes the uniform flow water curtain baffle and the second spray device to repeatedly deflect, mix, cool, and scrub dust-laden gas, solving the problems of gas flow deviation, poor cooling and scrubbing effects in existing hollow cooling and scrubbing towers. It has the advantages of high scrubbing efficiency, low resistance, no clogging, simple structure, and easy maintenance.

The application provides a DC energy storage system anti-sampling drift current sharing control method and system, comprising the following steps: S1: based on a DC network type energy storage system containing multiple energy storage converters, an equivalent circuit model of the multiple parallel energy storage converters is constructed; S2: based on an active voltage disturbance method, load impedance of the DC network type energy storage system is estimated according to the equivalent circuit model of the multiple parallel energy storage converters; S3: each energy storage converter respectively calculates a current reference value of DC network type energy storage system current sharing according to a local estimated value of the load impedance, and respectively calculates a line voltage drop value that needs to be compensated based on the current reference value; and S4: based on the calculated line voltage drop value that needs to be compensated, the influence of the line impedance on the DC bus voltage is offset.

The invention provides a test module and a test device, a capacitor assembly and a switch assembly are both located in a frame assembly, and the capacitor assembly and the switch assembly are connected with a semiconductor device to be tested. Wherein the switch assembly comprises a protection switch, and the protection switch is connected with the capacitor assembly. In the direct-current pulse capacitor discharging process, the protection switch can perform overvoltage protection on the capacitor bank, and damage to the tested semiconductor device and the test module can be avoided. In other words, the test module provided by the invention is high in reliability. The switch busbar is connected according to a device connection mode and layout, the loop distance is short, the back-and-forth superposed parasitic inductance is low, the stray inductance is low, and the problem that the parasitic inductance generates voltage and current overshoot under the condition of high current change rate is effectively solved. Therefore, the switch busbar not only can meet the requirements of voltage resistance, insulation and heat dissipation, but also can effectively improve the problems of turn-off voltage peak, voltage and current waveform distortion and the like, and reduces the voltage stress on a tested semiconductor device.

The invention discloses a busbar and a converter, and belongs to the field of converters. The busbar comprises a bottom plate; the at least two first connecting ends are arranged on the bottom plate, and the at least two first connecting ends are used for being connected with the multiple bridge arms in a one-to-one correspondence mode; and the second connecting end is arranged on the bottom plate and is used for being connected with an external circuit. According to the busbar, the common end of the power device of the converter is connected through the busbar, wiring can be simplified, the through-current capability is effectively improved, large-area copper laying is not needed, and the heat dissipation capability of a circuit board, the power density of the converter and the capacity utilization rate of the power device in a converter circuit are improved.

An integrated rectangular disc finned tube comprises a base tube and a plurality of parallel rectangular disc fins which are located on the outer contour of the base tube and form an integrated structure with the base tube. The gap between every two adjacent rectangular disc fins is 0.2-50 times of the thickness of each rectangular disc fin, and the diameter of each rectangular disc fin does not exceed 10 times of the diameter of the base tube. According to the integrated rectangular disc finned tube, the rectangular section is easy to manufacture, the flow equalizing effect is good, the heat exchange efficiency is good, machining forming is facilitated, the production efficiency is high, machining stress is reduced, working media are evenly distributed, the heat exchange uniformity is improved, dust accumulation is reduced or even avoided, contact thermal resistance is eliminated, the heat transfer efficiency is high, stability is high, and the service life is long; and a self-rectification effect is achieved on smoke, and airflow flowing is facilitated. The heat exchanger can be widely applied to the technical field of heat exchangers.

The present invention belongs to the field of semiconductor manufacturing technology and provides a remote plasma source power coupling circuit and control system, including a DC voltage source, two parallel current sharing circuits, a three-winding transformer and a cavity load, wherein the current sharing circuit includes a full-bridge inverter circuit, a resonant converter, a current sharing resistor R o , the full-bridge inverter circuit inputs a DC voltage source; the resonant converter is connected to the full-bridge inverter circuit; the resonant converter includes an inductor L r , capacitor C r and inductor L k , inductance L r Connect the full-bridge inverter circuit, inductor L k Connect three-winding transformer; current-sharing resistor R o and inductor L k The primary winding coil of the three-winding transformer is connected to the two current-sharing circuits respectively, and the secondary winding coil is connected to the cavity load. The remote plasma source power coupling circuit provided by the present invention can improve the output power of the remote plasma source through the two current-sharing circuits of the transformer, and realize the effect of automatic current balancing of hardware through the transformer.

This invention discloses a multi-chip parallel orthogonal current sharing module and its fabrication method. The module provides a first chip layer where the lower power semiconductor devices are arranged in a planar symmetrical layout, and the vertical positions of each lower power semiconductor device correspond to the corresponding upper power semiconductor device. Due to the vertical position correspondence combined with the planar symmetrical layout, the inductance of each path within the first and second chip layers is consistent, thus easily achieving a better current sharing effect. Furthermore, the metal pads connected to the lower part of the decoupling capacitor, which are set in the copper plate holes at the AC end, are arranged parallel to each lower metal pad. This allows the decoupling capacitor to have reverse mutual inductance with each lower power semiconductor device. The upper metal pads of the capacitor are also arranged parallel to the upper metal pads of the capacitor, thereby achieving reverse mutual inductance between the decoupling capacitor and each upper power semiconductor device. This, in turn, cancels out the vertical path mutual inductance, achieving the goal of reducing parasitic inductance.

This invention discloses a DC-DC converter and control method based on coupled inductors, comprising a capacitor connected in parallel across the low-voltage side; the capacitor is also connected in parallel across the high-voltage side; the coupled inductor module includes a first winding and a second winding mounted on the same magnetic core, one end of the first winding being connected to the midpoint of a first switch and a second switch, and one end of the second winding being connected to the midpoint of a third switch and a fourth switch; the other ends of the first winding and the second winding are connected to form a common connection point, which is connected to a reference potential terminal on the high-voltage side; the high-voltage side transmits electrical energy to the high-voltage side through the first bridge arm, the second bridge arm, and the coupled inductor module; this invention winds two inductors on the same magnetic core to form mutual inductance, replacing two independent filter inductors or energy storage inductors in traditional circuits with coupled inductors, significantly reducing the size and weight of magnetic devices and increasing power density.

The invention provides a motor controller, a power system and a vehicle, and relates to the technical field of motors, the motor controller comprises a direct current bus capacitor unit, the direct current bus capacitor unit comprises a first capacitor and a second capacitor which are connected in series, the first capacitor and the second capacitor are adjacent, and at least parts of the first capacitor and the second capacitor are oppositely arranged; the first connecting bar assembly is used for connecting the first capacitor and the second capacitor in series; and the power unit is electrically connected with the first connecting bar assembly. According to the motor controller, the internal stray inductance of the motor controller can be reduced, the working efficiency of the system is improved, and the model selection cost of the bus capacitor and the power module is reduced.

The utility model belongs to the technical field of VOCs (volatile organic compounds) treatment, and provides a heat storage incinerator inlet and outlet airflow uniform distribution device which comprises a folded plate. And the folded plate is fixed in the furnace body, covers the upper part of the expanding section cavity, is positioned below the regular heat accumulator, and is formed by sequentially connecting at least two sieve plates. According to the device, the perforated folded plate is arranged in the limited space of the RTO inlet, gas is redistributed through the folded plate, gas flow can be promoted to be uniformly distributed, sintering ash can fall down through the holes in the folded plate, purging is facilitated, and blockage is prevented. According to the device, factors such as space saving, flow field uniform distribution, resistance reduction, energy conservation and consumption reduction, convenience in maintenance, convenience in dust collection and the like are synchronously considered, and a good flow equalizing effect can be achieved through reasonable trepanning shapes, trepanning distances and trepanning sizes.

The utility model discloses a back-to-back switch parallel connection layout structure which comprises a circuit breaker assembly, contactors, a cabinet lower line bank, a contactor lower part parallel connection bank, a contactor upper part parallel connection bank, a cabinet upper line bank, a circuit breaker fixing plate and a contactor fixing plate assembly. The two circuit breaker assemblies are arranged in a back-to-back mode and are installed on the two circuit breaker fixing plates respectively. The two contactors are arranged back to back and are respectively fixed on one contactor fixing plate assembly; the lower end of the circuit breaker assembly is connected with a cabinet lower line bank. The upper end of the circuit breaker assembly is connected with the middle of the contactor lower parallel row; upper and lower contacts of two back-to-back contactors are respectively connected with a contactor lower part parallel bar and a contactor upper part parallel bar; and the middle part of the upper end of the contactor upper parallel bar is connected with the cabinet upper line bank. The utility model has the advantages of compact structure and strong versatility, and can satisfy switch combinations of different power levels.

The flow dividing and collecting structure comprises a flow dividing and collecting assembly and a sealing main plate, the flow dividing and collecting assembly comprises a channel part and a flow equalizing part, a plurality of flow equalizing cavities are formed in the first brazing surface of the flow equalizing part in an array mode, and each flow equalizing cavity is communicated with a fluid channel of the channel part through a corresponding flow equalizing groove channel and a flow dividing hole; the sealing main plate is provided with an array formed by a plurality of heat exchange tube insertion holes, the heat exchange tube insertion holes correspond to the flow equalizing cavities in position, and the lower surface of the sealing main plate is attached to the first brazing surface of the flow dividing and collecting assembly to form a uniformly-sealed flow dividing and collecting structure; the scheme that the flow dividing and collecting assembly and the sealing main plate are machined respectively is adopted, design and machining of the flow equalizing channels are facilitated, and the better flow equalizing effect is achieved; the micro-channel heat exchanger and the heat pump system adopting the flow dividing and collecting structure are small in size, high in bearing pressure, low in cost and high in heat exchange efficiency.

The present invention discloses an automatic current balancing method for a multi-phase input parallel output parallel dual active bridge converter. Each submodule in the multi-phase input parallel output parallel dual active bridge converter is composed of a first switch circuit, a series inductor, an isolation transformer, a second switch circuit and a DC port side capacitor. A cyclic disturbance parameter estimation algorithm is used to estimate the parameter mismatch of each module. Once the parameters of each module are estimated, the compensation shift ratio of each submodule of the parallel system to meet the current balancing can be calculated, thereby achieving system current balancing. The present invention realizes automatic current balancing of a multi-phase input parallel output parallel dual active bridge converter, so that the power of each submodule is evenly distributed; it can be used in high-power parallel switch power supply occasions such as new energy power generation, electric vehicles, aerospace, uninterruptible power supply, DC power distribution system, energy storage system, etc., and has many advantages such as reasonable method, convenient implementation, good versatility, small size, low cost, etc.