5results about How to "Improve EMI performance" patented technology

This invention discloses a resonant circuit, a PCB board, and a controller, including a power inverter unit, an upper bridge arm resonant pre-charge unit, a lower bridge arm resonant pre-charge unit, an upper bridge arm buffer unit, and a lower bridge arm buffer unit. The input terminal of the upper bridge arm resonant pre-charge unit is connected to an external DC input terminal, and the output terminal of the upper bridge arm resonant pre-charge unit is connected to the power inverter unit through the upper bridge arm buffer unit. The input terminal of the lower bridge arm resonant pre-charge unit is connected to a ground terminal, and the output terminal of the lower bridge arm resonant pre-charge unit is connected to the power inverter unit through the lower bridge arm buffer unit. By introducing an active clamping and pre-charge mechanism, the circuit can suppress voltage spikes to a lower level at the moment of turn-off. Compared with traditional passive RCD absorption technology, its voltage clamping value is more stable and less affected by load fluctuations, which reduces the voltage withstand burden of the switching transistor to a certain extent and improves the reliability of the circuit.

The invention discloses a VDMOS device of an integrated capacitor and a preparation method thereof, and relates to the technical field of microelectronics, and the VDMOS device comprises a drain electrode, a substrate and a drift region which are stacked in sequence; the first gate oxide layer is located on the upper surface of the drift region, and the orthographic projection of the first gate oxide layer is located in the orthographic projection range of the substrate in the direction perpendicular to the substrate; the grid electrode is located on the upper surface of the first gate oxide layer, and the orthographic projection of the grid electrode is located in the range of the orthographic projection of the first gate oxide layer; the second gate oxide layer covers the upper surface and the side surface of the gate electrode, and the orthographic projection of the second gate oxide layer is overlapped with the orthographic projection of the first gate oxide layer; the source electrode is located on the side face of a gate oxide layer composed of the first gate oxide layer and the second gate oxide layer, and the height of the source electrode is larger than that of the gate oxide layer; the insulating layer is positioned on the upper surface of the source electrode; the metal layer is located on the upper surface of the insulating layer, and the metal layer is connected with the grid electrode through the conductive hole. According to the invention, the switching rate of the VDMOS device can be reduced.

The utility model relates to a composite cable for aerospace. The composite cable is sequentially provided with a signal wire core, a control wire core, a power wire core, a filling layer, a shielding layer, an anti-radiation layer and an outer protective layer from inside to outside, each signal wire core comprises a signal wire core conductor, and a signal wire core inner insulating layer and a signal wire core outer insulating layer which are sequentially arranged on the outer side of the signal wire core conductor; the two signal wire cores are twisted and filled with a first filling layer; a first shielding layer and a second shielding layer are sequentially arranged on the outer side of the first filling layer to form a twisted pair wire core; a second filling layer is arranged on the outer sides of the two signal twisted pair wire cores; a control wire core is arranged outside the twisted pair cable core; the two signal twisted pair wire cores are arranged in the center, the control wire cores are arranged around the signal twisted pair wire cores, and one-time cabling is completed to form a control signal cable core; two layers of hot melting aluminum foil mylar tapes are arranged on the outer side of the control signal cable core. The composite cable for aerospace avoids the interference of electromagnetic waves, reduces the size of the cable, reduces the cost, improves the use stability of the cable, and prolongs the service life of the cable.

The utility model discloses an inductor with a complete plane, which relates to the field of inductance elements, and comprises a first iron core, a second iron core, a third iron core and a fourth iron core, the second iron core is of a rectangular block-shaped structure; the terminal is of a structure shaped like a Chinese character'ji '; the terminal is inserted into the first iron core from the opening position, and the second iron core is inserted into the terminal, so that the first iron core completely covers the terminal and the second iron core, and the outer surface of the inductor forms a complete plane. The first iron core is used as a magnetic protective cover to completely cover the second iron core and the terminals, so that the outer surface of the formed inductor is of a complete plane structure, a split type stacking connection structure in the prior art is replaced, in the SIM technology, direct empty suction can be achieved, use is convenient, gaps do not exist on the outer surface of the inductor structure, and the structure is simple. And the stability of the size space is improved. Under the action of a complete plane and zero clearance, the electromagnetic interference performance is improved, and the stability of saturation current is improved.

The utility model relates to the technical field of car light circuit, specifically disclose a miniaturized integrated car light BUCK circuit, including BUCK IC integrated chip, BUCK IC integrated chip includes VIN pin, EN pin, VOUT pin, FB pin, VCC pin and BST pin, has the first capacitor group and second capacitor group on VIN pin, the first resistance formation POWER IN is connected on EN pin, the voltage -division resistance for voltage division is provided with on FB pin, VOUT pin is connected with third capacitor group, the utility model discloses a purpose at to solve the traditional car light circuit reliability problem through car light BUCK circuit, help system improves stability.