13 results about "Commutation cell" patented technology

The application discloses an asymmetric phase-shifting control method suitable for a half-wave shaping MMC, and can realize wide-range operation energy balance of a converter. The method is characterized in that, in a 2pi period, a commutation unit switching function and a multi-level unit modulation voltage are not switched in a half-wave period pi, but in a positive half-wave mode, [0, pi] is taken as a reference to expand and shift an angle theta to the left and right, that is, the interval is [-theta, pi+theta], and in a negative half-wave mode, [pi, 2pi] is taken as a reference to shrink and shift an angle theta to the left and right, that is, the interval is [pi+theta, 2pi-theta]. The application adopts an asymmetric phase-shifting modulation method, generates and reverses polarities of two asymmetric partial sine waves through a commutation switch cooperating with a multi-level unit, and obtains a complete multi-level sine wave on an alternating current side. The application can eliminate the limitation of a power factor angle on a phase-shifting angle while realizing wide-range energy balance of the converter, is only affected by a modulation ratio, and compared with symmetric phase-shifting modulation, is beneficial to simplifying commutation control logic when the system is in a wide-range reactive power regulation, and has better engineering application value.

A power electronics converter may include: a converter commutation cell having a power circuit and a gate driver circuit, the power circuit including at least one power semiconductor switching element and at least one capacitor, wherein each power semiconductor switching element is embedded in a solid insulating material, wherein each power semiconductor switching element has at least three terminals including a gate terminal, wherein the gate driver circuit is electrically connected to and configured to provide switching signals to the gate terminal of each power semiconductor switching element, wherein a peak rated power output of the power electronics converter is greater than 25 KW, and wherein a total rated capacitance of the power circuit of the converter commutation cell divided by the peak rated power output of the power electronics converter is less than or equal to 5 nF / W.

The utility model discloses a primary side feedback bidirectional flyback voltage conversion circuit based on an auxiliary coil commutation circuit. The primary side feedback bidirectional flyback voltage conversion circuit comprises a flyback transformer, an auxiliary coil commutation unit, a control unit and a main power loop. The auxiliary coil reversing unit is connected with the control unit; the control unit is connected with the main power loop, and the main power loop is connected with the flyback transformer; wherein the auxiliary coil commutation unit is used for enabling a coil of the flyback transformer to be subjected to commutation when the circuit is in a reverse DCDC conversion mode. By implementing the circuit provided by the utility model, a more efficient and safer battery equalization solution can be provided for the battery pack, the cost is lower and the stability is higher than that of the traditional secondary side feedback scheme, the key problems in the current equalization technology can be solved, and the circuit can be widely applied to a battery management system and has a wide application prospect. And the service life and efficiency of the whole battery pack are improved.

A power electronics converter may include: a first multi-layer planar carrier substrate having one or more electrically conductive layers; a second multi-layer planar carrier substrate having one or more electrically conductive layers; a converter commutation cell circuit including a plurality of commutation cell components that are electrically connected together via the one or more electrically conductive layers of the first planar carrier substrate and electrical connections, the commutation cell components including one or more power semiconductor switching elements in one or more power semiconductor prepackages, each power semiconductor prepackage including a power semiconductor switching element embedded in a solid insulating material; one or more additional converter components electrically connected to the one or more electrically conductive layers of the second planar carrier substrate; and one or more further electrical connections connecting together one or more of the electrically conductive layers of the first carrier substrate and the second carrier substrate.

A commutation cell arrangement 100 comprises a printed circuit board 1 having an upper side 11 and a lower side 12. A first switching unit SH and a second switching unit SL are connected as a half bri

The invention provides a rotating electrode film automatic preparation device which comprises a mechanical movement unit, a force control polishing unit, a cleaning unit, a reversing unit and a positioning spin-coating unit, the full-automatic rotating disc electrode preparation process is achieved, the mechanical movement unit is combined with the force control polishing unit to achieve artificial constant-force 8-shaped polishing, manpower is liberated, and meanwhile the automatic rotating disc electrode preparation process is achieved. The grinding quality is ensured; the mechanical movement unit is combined with the positioning spin-coating unit to complete automatic spin-coating, and the preparation quality can be improved while the preparation efficiency is improved through high-repeatability operation. The device can effectively solve the problems of large polishing force fluctuation, poor film uniformity, low process repeatability and the like in manual preparation through multi-module collaborative operation, and is suitable for standardized preparation of catalysts in the fields of fuel cells, electrolyzed water and the like.

The invention belongs to the field of valves, and relates to a reversing valve technology, in particular to a multi-position reversing unit, application of the multi-position reversing unit, a loader big arm control system and a control method. On the basis of on-off current control of the electromagnet, switching of at least four positions of the valve element in the valve cavity can be achieved in cooperation with the first elastic assembly and the second elastic assembly, so that the fluid direction is switched, and multi-position reversing is achieved. The first electromagnet and the second electromagnet are electrified to release current signals so as to generate pressure, the pressure and spring force of springs in the two end covers interact and are matched, multi-position control is achieved, and different positions correspond to different spring force according to different valve element moving distances and valve element moving directions. And corresponding current outputs are different, so that multi-position commutation is realized by means of current control. Compared with the prior art that multi-position reversing is controlled through a pilot handle, multi-position reversing can be achieved through current remote control, the structure is simple, and transposition sensitivity and precision are high.

A method for reducing a circulating current in a power converter includes: for each phase current provided by the power converter: determining a characteristic frequency in the respective phase current, wherein the characteristic frequency is a switching frequency of the switching units of commutation cells of the power converter or related to the switching frequency. The method further includes: determining a magnitude of the characteristic frequency; comparing the magnitude of the characteristic frequency with a predetermined magnitude; and, when the magnitude is larger than the predetermined magnitude, adding or reducing in steps a switching delay to a top or bottom switching unit of a commutation cell of a first power converter unit of the power converter until the magnitude of the characteristic frequency is equal to or below the predetermined magnitude.

The application discloses a kind of energy release devices using capacitive resonance mode, the energy release device includes capacitive energy release circuit, the capacitive energy release circuit includes No. m , No. 2 thyristor D m , capacitor C1 and No. 1 resistance R1;The parallel circuit of No. 1 thyristor D1 and No. 1 resistance R1 after parallel connection and capacitor C1 series connection with No. 1 switch tube S1 form parallel circuit, and the parallel circuit and No. 2 thyristor D m Series connection is connected on the main circuit between external DC / DC step-up / down converter and chopping commutation unit;It is also disclosed to corresponding energy release power system, energy release method;It reduces the system volume, and working state is switched flexibly, dissipates electric energy with small resistance value, avoids making other electrical components in circuit bear excessively high voltage in energy release process, and reduces heat generation.

A planar substrate is provided having an electrically insulating ceramic material having a thermal conductivity of more than 100 W / m * K at a temperature of 25 DEG C.

The application discloses a roller conveyor system capable of realizing twice 90-degree commutation in sequence, which is suitable for the conveying requirement of a lithium battery production line; a commutation transfer unit (3) is arranged on a commutation conveying support (5) arranged along the left-right horizontal direction; a row of front short conveying roller cylinders (6) and a row of rear short conveying roller cylinders (7) are arranged on the top end surface of the commutation conveying support (5) and parallel to each other and along the left-right horizontal direction; a left-side liftable transfer machine (8) is arranged on the commutation conveying support between the left end of the row of front short conveying roller cylinders (6) and the left end of the row of rear short conveying roller cylinders; and a right-side liftable transfer machine (9) is arranged on the commutation conveying support between the right end of the row of front short conveying roller cylinders (6) and the right end of the row of rear short conveying roller cylinders; the effective and uniform conveying of the driving force of the short roller in the left-right direction of the commutation unit is realized, and the components of the whole commutation unit are lightened and economical.

A power module, in particular a commutation cell for an inverter. The power module includes a circuit carrier, in particular a ceramic circuit carrier, and at least one or only one semiconductor switch half-bridge with two semiconductor switches, in particular power semiconductor switches, wherein the semiconductor switches are in particular integrally connected to the circuit carrier. The power module of the above-mentioned type includes a flexible circuit board, which is in particular integrally connected to the circuit carrier. The flexible circuit board is arranged in the area of the semiconductor switches. The power module comprises a temperature sensor, which is integrally connected to the flexible circuit board and is designed and arranged to sense a temperature of the circuit carrier in the area of the semiconductor switches, and in particular thus indirectly a temperature of the semiconductor switches, through the flexible circuit board.