45results about How to "Reduce loop inductance" patented technology

A chip capacitor 20 is provided in a core substrate 30 of a printed circuit board 10. This makes it possible to shorten a distance between an IC chip 90 and the chip capacitor 20 and to reduce loop inductance. Since the core substrate 30 is constituted by providing a first resin substrate 30a, a second resin substrate 30b and a third resin substrate 30c in a multilayer manner, the core substrate 30 can obtain sufficient strength.

The invention relates to the inversion power module and particularly relates to a three-phase inversion power module based on a two-way spiral flow channel water cooling heat radiation substrate. The three-phase inversion power module based on the two-way spiral flow channel water cooling heat radiation substrate solves problems that a present heat radiation flow channel is not reasonable, poor in heat radiation, big in size and weight and not easy to perform fast plug-pull installation. In the scheme of the three-phase inversion power module based on the two-way spiral flow channel water cooling heat radiation substrate, a three-phase inversion power circuit is arranged on the two-way spiral flow channel water cooling heat radiation substrate; a T-shaped composite mother board and a drive board are stacked on the two-way spiral flow channel water cooling heat radiation substrate; a support seat is arranged in the front edge of the two-way spiral flow channel water cooling heat radiation substrate; water connectors and fixed blocks are arranged on two sides of the two-way spiral flow channel water cooling heat radiation substrate; and screw rods and a handle go through the fixed blocks. The advantages of the three-phase inversion power module based on the two-way spiral flow channel water cooling heat radiation substrate has advantages that flow resistance of a cooling liquid is small and heat radiation is uniform; the water connectors are easy to mount and dismount without affecting processing accuracy; and the layout is not affected by the flow channel; circuit electric inductance is small and working reliability of a thermal performance power module is high. Furthermore, the three-phase inversion power module based on the two-way spiral flow channel water cooling heat radiation substrate is compact in layout, small in volume and light in weight, saves cost; the interfaces are preposed in sequence, which is easy to maintain and saves external fast connection device; and a driving signal is high in anti-interference.

The invention discloses a control isolated form high-pressure mechanical switch which comprises a positive pole, a negative pole and outer insulating cylinders. The outer insulating cylinders are placed on two sides in pairs; the negative pole is connected on the inner rims of the upper ends of the outer insulating cylinders, and the positive pole is connected on the inner rims of the lower ends of the insulating cylinders; the positive pole, the negative pole and the insulating cylinders form a seal working cavity, and transformer oil is filled in the cavity; and the negative pole is provided with a groove with an upward opening, and a driving electromagnet is covered in the groove.

A slab electroslag furnace belongs to the technical field of metal electroslag remelting. Including AC power supply, electrode lifting mechanism, electrode, crystallizer, supporting platform, dummy device, molten steel liquid level detection device, rotating frame, weighing sensor, ingot pulling mechanism and control system, the crystallizer is fixed on the supporting platform, rotates The frame is fixed on the support platform and can rotate along the fixed track on it. The electrode lifting mechanism is placed on the frame platform and can be adjusted horizontally. There is a load cell between the electrode lifting mechanism and the contact surface of the frame platform. The electrode is a single One end is fixed on the electrode lifting mechanism, the other end is placed in the crystallizer, the molten steel level detection device is installed on the side wall of the mold, and the ingot pulling mechanism is installed on the bracket below the supporting platform. An ingot transporting trolley is fixed on the ingot mechanism, and an ingot dummy device is fixed on the ingot transporting trolley, and the control system is electrically connected with the electrode lifting mechanism, the load cell, the ingot pulling mechanism, and the ingot transporting trolley.

The invention relates to the field of insulated gate bipolar translator (IGBT) driver design, in particular to a high-voltage high-power IGBT driver based on digital control. The IGBT driver comprises a drive main control panel and a drive adaptive panel. The drive main control panel is connected with three output terminals of the drive adaptive panel through high-voltage insulation guide lines. The drive adaptive panel is fixedly connected with a collector, a grid and an emitter of an IGBT through screws, and the drive main control panel is connected with the collector of the drive adaptive panel mounted on the IGBT through a single high-voltage guide line. The drive main control panel is connected with the grid and the emitter of the drive adaptive panel mounted on the IGBT through double-twisted high-voltage guide lines. The drive main control panel has a function of changing single power input to driving double power output, and the drive adaptive panel has functions of grid protection and active clamp. The high-voltage high-power IGBT driver based on digital control has the advantages of being safe and reliable, and through the digitally controlled IGBT driver, is simple and intelligent in control, and capable of controlling the specific process of switch-on or switch-off of the IGBT, and has unique advantages.

The invention relates to the technical field of telemetry communication, and discloses a 64-way analog acquisition BGA packaging chip, including a substrate, a bare chip and solder balls; the substrate includes a stacked wiring layer, a ground layer, a power layer, a bottom layer, and a first conductive The connection unit, the second conductive connection unit and the third conductive connection unit; the surface of the wiring layer is provided with a first pad as a first bonding point at a position corresponding to the first conductive connection unit, and at a position corresponding to the second conductive connection unit A second bonding pad is provided as a second bonding point, and a third bonding pad is provided as a third bonding point at a position corresponding to the third conductive connection unit; the AD chip in the bare chip and the second bonding point on the wiring layer It is electrically connected to the third bonding point, and the operational amplifier and the analog gate are electrically connected to the first bonding point and the second bonding point on the wiring layer; the substrate structure of the present invention is compact, and the space utilization rate is high, and the bare chip is used for circuit design and packaging. The volume is reduced by about 85%, which improves the versatility of the chip.

The invention discloses a subway permanent magnet traction inversion chopper power module composite busbar, which is used to solve problems of conventional composite busbars such as heavy weight, complicated structure, and inconvenient installation. An inversion output busbar is formed by fixedly arranging three right angle-shaped copper bar bodies, and the upper end of every copper bar body is provided with an inversion output terminal. A chopper resistance busbar is formed by a right angle-shaped copper bar body, and the upper end of the chopper resistance busbar is provided with a chopper output terminal. An inversion direct current busbar and a chopper direct current busbar are respectively provided with a screwed sleeve, and a supporting capacitance busbar and an inversion direct current busbar are in a vertical arrangement, and in addition, one end of the supporting capacitance busbar is provided with a bolt connecting board cooperated with the screwed sleeves. The other end of the supporting capacitance busbar is provided with two direct current bus positive pole terminals and a direct current bus negative pole terminal. The subway permanent magnet traction inversion chopper power module composite busbar is advantageous in that the weight of the composite busbar is integratedly reduced, inductance of a circuit is reduced, and working reliability of an IGBT is improved.

The invention relates to a capacitive energy storage unit and a high voltage pulse generator. The capacitive energy storage unit comprises a conductive shell with a negative electrode leading-out end;at least two capacitors are fixedly arranged in the conductive shell; the negative electrode of each capacitor is electrically connected with the conductive shell separately, while the positive electrodes of the capacitors are correspondingly and electrically connected through positive electrode conductive parts; an insulating structure for realizing insulation between the positive electrodes andthe positive electrode conductive parts of respective capacitors and the conductive shell is placed in the conductive shell; and leading-out positive electrode via holes for allowing the positive electrode conductive parts to be led out to be conductively connected with corresponding positive electrode cables or allowing the positive electrode cables conductively connected with the positive electrode conductive parts to pass through are formed in the conductive shell. The capacitors and the positive electrode conductive parts are both positioned in the conductive shell, and the positive electrode conductive parts or the positive electrode cables electrically connected with the positive electrode conductive parts pass through the positive electrode pass-through holes to further form a corresponding coaxial structure, so that the loop inductance of a discharge loop is lowered effectively and radiation noise in the discharge process is lowered.

A power module packaging structure, the power module includes: a substrate with a first conductive region, a second conductive region, a third conductive region, a first fixed connection region and a second fixed connection region, the first conductive region, the first conductive region The two conductive regions and the third conductive region are electrically connected to the first terminal, the second terminal and the third terminal, and the first switch group and the second switch group are electrically connected by the first fixed connection region and the second fixed connection region , so as to achieve mutual parallel arrangement between each other. The first terminal is a current input terminal, the second terminal is a relay terminal, and the third terminal is a current output terminal. When the current flows from the current input terminal to the relay terminal, or from the relay terminal to the current output terminal, the current takes a straight line path to reduce the crossover area of ​​the power module current loop and reduce the loop leakage inductance.

A cable reduces loop inductance by changing the cross-sectional shape of the conductive elements of power supply and return conductors to something other than the traditional circular cross sectional shape, e.g., to a thin generally rectangular shape. The power supply and return conductors are also controlled in placement along the length of the cable, so that mutual inductance is maximized within a given power supply circuit, and minimized between the given power supply circuit and other power supply circuits within the cable. The return power supply conductor may optionally be sized for multiple power supply circuits, which may further reduce loop inductance and reduce crosstalk noise between different power supply circuits within a common cable. The power supply and return conductors may be part of a hybrid cable used to power and communicate with plural remote radio units proximate a top of a tower.

The invention discloses a portable fast pulse generating device and a manufacturing method thereof, comprising: a high-frequency PCB circuit board, a main loop structure, a secondary loop structure, a power supply and a load; both the primary loop structure and the secondary loop structure are built on a high-frequency PCB circuit board; the main circuit structure includes the main capacitor C 1 , mercury switch and filter module; all components of the main circuit structure are in a straight line; the secondary circuit structure includes a high-voltage DC voltage source and a charging resistor R 1 ; High voltage DC voltage source and charging resistor R 1 Used to form the main capacitor C 1 The charging circuit; the power supply is used for the power supply of the high-voltage DC voltage source; the power supply is also used for the triggering of the mercury switch; the load is connected to the high-frequency PCB circuit board through the SMA plug and the SMA socket. The invention miniaturizes the signal source used to generate the electromagnetic wave for calibration, and can meet the calibration requirement of the ultra-high frequency sensor for partial discharge measurement under actual working conditions on site.