47results about How to "Improve current sharing effect" patented technology

The invention belongs to the technical field of droop control of DC converters, relates to a droop control method of a DC converter with a function of secondary adjustment of adaptive impedance, and aims to solve the problems that distributed generating unit cable impedance difference causes poor droop current homogenization effect to the DC distributed power supply system and the DC micro grid based on droop control and the parallel DC converters is low in steady state and dynamic current homogenization precision. The method has the advantages that the steady state and dynamic current homogenization precision of the parallel DC converters in the distributed DC power supply system and the DC micro grid based on droop control is improved; parameters, such as voltage, current and droop coefficient, of the parallel converters are transmitted in real time through low-speed communication, the droop coefficient is adjusted in self-controllers of the parallel converters, and finally external characteristic impedances of the parallel converters are equalized; droop curves are subjected to shifting adjustment, and bus voltage drop caused by droop control is improved.

The invention relates to a smoke gas purification device by a semidry process, which is provided with an independent desuperheating tower, comprising a reaction tower provided with an smoke inlet box, a smoke gas outlet, a venturi tube type tower wall arranged on a tower bottom, a water injector arranged on the tower wall and a nozzle for lime dry powder and revert dust; and the smoke gas outlet is connected with an inertia separator, an activated carbon mixer, a bag-type dust remover and a draught fan. The invention is characterized in that the invention is also provided with the desuperheating tower which is provided with a boiler smoke gas inlet manifold, a single-stage water injector, an ash bucket with an ash hole and a gas flue; the gas flue of the desuperheating tower is connected with the smoke inlet box into one unit. The boiler smoke gas disperses within the two towers for cooling, thereby improving the adaptability of a system to a load; the boiler smoke gas particularly can be cooled down urgently to a set temperature in the desuperheating tower; and the reaction tower can be humidified only by evaporation with a little water to complete a deacidifying reaction and remove dioxin, thereby avoiding the disadvantages of scale formation on the tower wall of the prior reaction tower and bag burning of the bag-type dust remover, guaranteeing a sustaining and stable smoke purification process and having the advantages of good purification effect and low energy consumption.

The invention discloses a fluid distributor and belongs to the fluid distributing technical field. The fluid distributor comprises a distributing pipe body and guide plates. A flow distributing groove is formed in the pipe wall of the distributing pipe body. A blanking plate is arranged at the tail end of the distributing pipe body. The guide plates are arranged in the distributing pipe body. The guide plates are connected by inlet plates and outlet plates. The plate surfaces of the inlet plates extend along the entrance direction of the distributing pipe body. The plate surfaces of the outlet plates extend along the direction of the flow distributing groove. The guide plates are sequentially ranked along the length direction of the distributing pipe body. The inlet plates are ranked of a step shape, and projected areas on a cross section of space areas of the adjacent inlet plates are basically identical. Distance from the inlet plates to the flow distributing groove increases by degrees along the entrance of the distributing pipe body to the tail end of the distributing pipe body. The fluid distributor solves the technical problems of an existing distributor that heat exchange efficiency of a heat exchanger is low due to uneven flow distributing of an existing distributor, and is particularly suitable for refrigerant distributing of a plate type heat exchanger.

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

The invention discloses a driving circuit of semiconductor devices in a high-power converter and a working method thereof. The driving circuit includes a control signal receiving and processing unit,a large-capacity driver unit and a fault signal processing and feedback unit. The control signal receiving and processing unit is used for generating two complementary driving signals with dead zone from an external driving signal and transmitting the driving signals to the large-capacity driver unit. The large-capacity driver unit is connected with the semiconductor devices, and is used for receiving and amplifying the driving signals sent by the control signal receiving and processing unit and sending the driving signals to the semiconductor devices, and obtaining the voltage value across the two ends of each semiconductor device and feeding the voltage values back to the fault signal processing and feedback unit. The large-capacity driver unit simultaneously drives one or more semiconductor devices, which ensures the synchronization of the driving signals of the semiconductor devices and improves the current sharing of the semiconductor devices. The currents and temperatures of thesemiconductor devices are monitored and protected on the basis, which ensures the safe and stable operation of the semiconductor devices of the high-power converter.

The invention relates to a liquid collecting ring on the body part of a thrust chamber of a liquid rocket engine. The liquid collecting ring comprises an upper liquid collecting ring cover (1) and a lower liquid collecting ring cover (2), and a radial hole (7) and a collection slot (8) are formed in the lower liquid collecting ring cover (2). The cross section of the upper liquid collecting ring cover (1) takes the shape of an elliptical arc, and a concave slot is formed in the cross section of the lower liquid collecting ring cover (2). The upper liquid collecting ring cover (1) and the lowerliquid collecting ring cover (2) are connected to form a liquid collecting chamber (6), and the liquid collecting chamber (6) communicates with the collection slot (8) through the radial hole (7). The liquid collecting ring has the advantages of good flow equalization, small pressure loss and good strength and rigidity and can also solve the problem that the welding airtightness of a steel jacket(3) and the body part of the thrust chamber is poor in the prior art.

The invention provides a current sharing control method and a single-phase inverter parallel system, and the method comprises the following steps executed on each single-phase inverter: a, sampling anoutput current instantaneous value of a local machine in real time according to a sampling period, and calculating an output active current effective value and an output reactive current effective value, wherein the sampling period is smaller than the power frequency period; b, calculating an average instantaneous output current, an average output active current effective value and an average output reactive current effective value; c, obtaining an instantaneous voltage outer loop given compensation amount, a voltage effective value compensation amount and a phase adjustment amount; and d, adjusting a PWM driving signal output to a power unit according to the instantaneous voltage outer loop given compensation amount, the voltage effective value compensation amount and the phase adjustment amount. The method can quickly respond when the single-phase inverter is suddenly loaded and unloaded dynamically, and the current sharing performance of a parallel system is improved.

A regulator for an interleaved power factor correction circuit to enhance current sharing performance includes adjuster circuitry that determines a duty cycle adjustment; judge circuitry that determines whether to activate the adjuster circuitry; distributor circuitry that determines tuned duty cycles based on input duty cycles and the duty cycle adjustment; and tuner circuitry that determines tuned average inductor currents in first and second phases of the interleaved power factor correction circuit based on the tuned duty cycles.

The invention discloses a drive circuit suitable for multiple semiconductor parallel connections, which is used to drive any multiple semiconductor parallel loads, including one main signal isolation unit and one main power isolation unit connected to the upper computer control system and n One-way slave signal isolation unit and n-way slave power isolation unit, the drive unit is connected to the semiconductor, the main signal isolation unit isolates the signal obtained from the upper computer control system, and at the same time inputs the isolated signal into n slave signal isolation units; the main signal isolation unit The power signal obtained by the power supply of the power isolation unit is isolated, and at the same time, the isolated power is output to n slave power isolation units. The present invention is used to adopt the signal isolation unit and the power isolation unit with the master-slave arrangement, only the main signal isolation unit and the main power isolation unit need to meet the high insulation withstand voltage setting, which solves the problem of large volume and high cost of the traditional multi-semiconductor parallel drive question.

The invention discloses a current sharing control method and device, equipment and a computer readable storage medium and belongs to the technical field of communication. The method comprises steps ofacquiring a current sampling signal of a power circuit; converting the current sampling signal into a digital signal through a first analog-to-digital conversion unit; calibrating the digital signalto obtain the corresponding relationship between the current sampling signal and an output current signal of a power supply module; and performing current sharing control of at least one power supplymodule according to the corresponding relationship. The method is advantaged in that deviation caused by difference of sampling circuits to current sharing control of the parallel power supply modulesis eliminated, the current sharing effect of the power supply modules is improved, and system reliability is improved.

The invention discloses a driving control circuit for a multiple SiC MOSFET chip parallel power module and a printed circuit board thereof. The driving control circuit comprises a positive voltage input terminal, a negative voltage input terminal, a driving signal input terminal, a ground wire, a driving chip, a first decoupling capacitor, a second decoupling capacitor, a total driving resistor, a first voltage stabilizing diode, a second voltage stabilizing diode, N driving current-sharing resistors and N control terminals. The circuit and the printed circuit board thereof can implement driving on the multiple SiC MOSFET chip parallel power module and meanwhile, ensure safe and stable operation of each SiC MOSFET chip.

The invention discloses a medicine material flow equalizing device for a propellant extruder. The device comprises an outer cylinder, a mold body, a piston and a rubber pad, wherein the piston consists of a piston body, a piston rod and a rubber disc; a groove is formed in the bottom of the piston body; a ventilation hole communicated with the groove is formed in the top surface of the piston body; the rubber disc is fixed at the bottom of the piston body to enable a groove cavity of the groove to become an air storage chamber; inner holes of the outer cylinder are sequentially a pore diameterD1 section, a pore diameter D2 section and a pore diameter D3 section from top to bottom, and D2 > D1, D3 = D1; a plurality of medicine outlet holes with the same shape and size are formed in the mold body, through holes with the same position, number, size and shape as the medicine outlet holes on the mold body are formed in the rubber pad, and each through hole on the rubber pad is respectivelyaligned with the corresponding medicine outlet hole on the mold body when the rubber pad is fixedly connected with the mold body; and the piston body is mounted in the pore diameter D1 section, the rubber pad is mounted in the pore diameter D3 section, the mold body covers the bottom of the outer cylinder and is fixedly connected with the wall of the outer cylinder, and the pore diameter D2 section and the top surface of the rubber pad form a medicine material extrusion cavity.

The present application discloses a current sharing circuit structure and an electric motor controller of an electric industrial vehicle using the structure. The current sharing circuit structure comprises a power board and a power board, the top surface of the power board is provided with a U, V, W three-phase terminal and DC pump motor terminal, the U, V, W three-phase terminal is externally connected with a three-phase alternating current motor, The DC pump motor terminal is externally connected with the DC pump motor, and a positive input terminal and a negative input terminal for simultaneously supplying power to the power board and the power board are arranged between the power board and the power board, and the positive input terminal and the negative input terminal are externally connected with a DC power supply. The present application solves the technical problems of poor current sharing effect and poor layout rationality of the motor controller of an electric industrial vehicle.