66results about How to "Large room for optimization" patented technology

The invention discloses a light-emitting diode which at least comprises an N type layer, a light-emitting layer and a P type layer. The light-emitting layer is of a multi-quantum-well periodic structure and comprises a base layer, a first transition layer, a well layer and a second transition layer, wherein at least two thickness-uneven AlN thin layers are inserted among the base layer, the first transition layer and the second transition layer. The overlapping structure formed by the AlN thin layers, the base layer, the first transition layer and the second transition layer is adopted, and therefore the depolarization field of quantum well regions can be effectively modularized, the polarization charges between the well layer and the base layer are reduced, the energy band inclination is weakened, and the radiative recombination efficiency of carriers in the quantum well regions is improved.

The invention discloses a power grid flexible controller topology shared by modules, and belongs to the technical field of power generation, power transformation or power distribution. Each single-phase topology comprises an AC / AC converter comprising N1 CHB modules and an AC / DC module comprising N-N1 full-bridge rectifiers, an AC port at one side of the AC / AC converter is formed after the AC input ends of the N1 CHB modules are connected in series, an AC port at the other side of the AC / AC converter is formed after the AC output ends of the N1 CHB modules are connected in series, AC input ends of the N-N1 full-bridge rectifiers are connected in series to form an AC port of the AC / DC module, an AC port at one side of the AC / AC converter is connected in series with the AC port of the AC / DCmodule and then is connected to a first AC power grid, and an AC port at the other side of the AC / AC converter is connected in series with a DC port of the AC / DC module and then is connected to a second AC power grid. According to the invention, the transmission efficiency of the whole flexible controller topology is improved by using the common module part. Meanwhile, compared with a common three-phase CHB structure, the flexible controller topology shared by the modules based on the cascaded H bridge has the advantage that the equipment cost and size are greatly reduced.

The invention discloses a novel waveguide polarizer, which comprises a square waveguide (1), a metal partition plate (2) and two waveguide gradient parts (6 and 7), wherein the metal partition plate (2) comprises a receiving unit (3), a transmission unit (4) and a radiation unit (5) which are sequentially connected; the width of the metal partition plate (2) is equal to the length of the inner side of the square waveguide (1); the metal partition plate (2) is arranged at the axisymmetric position of the square waveguide (1); one end of the metal partition plate (2) is in contact with a square public port at one end of the square waveguide (1) and divides the square public port into two rectangular ports; the two waveguide gradient parts (6 and 7) are connected with the two rectangular ports respectively; two orthogonal wave beams received by the square waveguide (1) are converted by the metal partition plate (2); and a left-handed or right-handed circularly polarized signal is achieved by a phase difference generated between the received and converted wave beams. By the novel waveguide polarizer, good properties of the return loss, the insertion loss and the phase difference can be obtained.