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 a small-size integrated steep pulse generating device. The small-size integrated steep pulse generating device comprises an oil tank and an oil-immersed impulse voltage generator which is hung inside the oil tank through an insulation support. The oil-immersed impulse voltage generator comprises an impulse voltage generating circuit based on a plurality of pulse capacitors, a plurality of gas spark switches and a plurality of resistors; a plurality of ring-shaped capacitor shielding structures, a first insulator, a second insulator and a third insulator, wherein the plurality of pulse capacitors and the plurality of gas spark switches are fixedly arranged on the second insulator in an alternate mode; the plurality of ring-shaped capacitor shielding structures are distributed around the plurality of pulse capacitors and fixed onto the first insulator; the plurality of resistors are fixed onto the front surface and the back surface of the third insulator; the plurality of resistors, the plurality of capacitors and the plurality of gas spark switches are electrically connected through high-voltage wires; the third insulator is fixed onto the second insulator; and the insulation support is connected with the first insulator. The small-size integrated steep pulse generating device can output expected pulses for testing large-volume test objects.

A multi-waveform impulse current generator comprises a charge circuit and a discharge circuit. The charge circuit comprises a main transformer T, a high-voltage silicon stack G1, a high-voltage silicon stack G2, a switch K, a charging protection resistor RP, a direct current resistance voltage divider RF and a main capacitor CZ. The discharge circuit comprises the main capacitor CZ, a non-inductive resistor, a wave modulated resistor, a wave modulated inductor, a discharge gap GAP and a tube shunt Rs. The aim of adjusting the waveforms of the impulse current is achieved by adjusting the inductance of the wave modulated inductor and the resistance of the wave modulated resistor in the discharge circuit. The generator can generate the following three different impulse current waves: 1 / 5mu S, 8 / 20 mu S and 4 / 10 mu S, and can realize that one equipment generates 3 waveforms. Compared with the equipment required for generating the standard lightning impulse current wave, switching impulse current wave and steep wave impulse current wave, the generator can save the equipment in bulk, lower the cost, reduce the floor space of the equipment and improve the use ratio of the equipment.

This invention discloses a slab electroslag furnace, which comprises: an AC power supply, an electrode elevator, an electrode, a crystallizer, a support platform, an ingot feeder, a liquid level detector of molten steel, a rotary frame, a weight sensor, an ingot discharger, and a control system. The crystallizer is fixed in the support platform. The rotary frame is fixed on the support platform, and can move along a fixed track. The electrode elevator is set on the platform of the rotary frame, and can be horizontally adjusted. The weight sensor is set at the contact surface of the electrode elevator and the platform of the rotary frame. One end of the electrode (monopolar or bipolar) is fixed with the electrode elevator, and the other one is set in the crystallizer. The liquid level detector of molten steel is set on the sidewall of the crystallizer. The ingot discharger is set on a frame below the support platform. A wagon is fixed on the ingot discharger. The ingot feeder is fixed in the wagon. The control system, elevator, weight sensor, ingot discharger and wagon are electrically connected.

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 belongs to the technical field of the semiconductor laser driving circuit, and specifically relates to a pulse driving circuit based on a vertical cavity surface emitting laser. The structure circuit comprises a vertical cavity surface emitting laser, energy storage units, a switch unit, a driving chip, a current detection unit, a charge current-limiting unit, and an input-output interface; the components are integrated on one circuit board; a light-emitting surface electrode of the vertical cavity surface emitting laser is connected to a circuit board, the energy storage units are distributed around the vertical cavity surface emitting laser, and the switch unit is located on a back of the circuit board located by the vertical cavity surface emitting laser; the energy storage units, the vertical cavity surface emitting laser, the current detection unit and the switch unit form a discharge loop through circuit board via holes. By utilizing the dual-layer structure of thevertical cavity surface emitting laser and the circuit board multilayer circuit structure, the pulse discharge loop can be integrated in the 180-DEG space around the laser, the structure is simple, the distribution parameter is controllable, and the narrow pulse large current parameter is easy to produce, thereby obtaining the laser narrow pulse with high peak power.

The invention relates to an axial leading-out double-pole-plate coiling pulse formation line, and belongs to the technical field of pulse power. A pulse formation line body is formed by coiling two pole plates and two medium layers in an Archimedes spiral manner, the high-voltage pole plate, inner-side insulating media, the low-voltage pole plate and outer-side insulating media are arranged successively from inside to outside, and the positions of the high-voltage pole plate and the low-voltage pole plate can be interchanged; and the high-voltage pole plate, inner-side insulating media, low-voltage pole plate and outer-side insulating media are coiled for n rounds in the Archimedes spiral manner, the first round of the high-voltage pole plate and the first round of the low-voltage pole plate are led out in the axial two sides via a high-voltage leading-out foil and a low-voltage leading-out foil respectively, and the pulse formation line composed of an axial leading-out structure and n-a rounds of complete band-shaped wires is formed. The coiling pulse formation line is high in quality of output waveforms, and is simpler in structure compared with a three-pole-plate coiling band-shaped line.

The invention relates to a brake chopper composite busbar. With the brake chopper composite busbar adopted, problems such as large stray inductance of a main loop, poor circuit reliability, inconvenient installation, bloated structure, large occupied space and high design cost in the prior art can be solved. The brake chopper composite busbar of the invention includes an L-shaped flat O busbar, an L-shaped flat N busbar and an L-shaped flat P busbar which are stacked together; high-insulation strength materials are arranged between adjacent busbars; the O busbar is provided with an O connecting portion and O wiring terminals; the N busbar is provided with an N connecting portion and N wiring terminals; and the P busbar is provided with a P connecting portion and P wiring terminals. According to the brake chopper composite busbar of the invention, the stacked composite busbars are adopted to replace cables, copper bars or hot-compress busbars to perform electrical connection, and therefore, the complexity of previous wring can be lowered, and layout can be simple, and quality is more reliable; the size and weight of a system can be reduced, and repair and maintenance of a main circuit can be facilitated; and loop inductance can be reduced, and an IGBT can work safely and reliably, and the reliability of products can be greatly enhanced.

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.

Disclosed is a package board wherein a malfunction or error occurs even when a high-frequency IC chip, in particular an IC chip of more than 3 GHz is mounted. A conductor layer (34P) having a thickness of 30 mum is formed on a core substrate (30), and a conductor circuit (58) having a thickness of 15 mum is formed on a interlayer resin insulating layer (50). By forming the conductor layer (34P) thick, the volume of the conductor itself is increased, thereby reducing the resistance. In addition, the power supply capacity to the IC chip can be improved by using the conductor layer (34) as a power supply layer.

The invention relates to a probe card. A conductive layer is arranged on an insulating base body of a probe seat of the probe card; and the conductive layer is electrically connected to a grounding circuit on the probe card through a conductive pin penetrating through the insulating base body, wherein the first end of a probe on the probe card is electrically connected to a test circuit of a circuit board; part of an intermediate section is fixed in the insulating base body in a penetrating way; the second end of the probe passes out of the insulating base body to expose outside; the periphery of the intermediate section of the probe is wound by a lead wire; the first end of the lead wire is electrically connected with the grounding circuit of the circuit board; and the second end is electrically connected with the conductive layer. Therefore, a section of grounding range of the conductive layer is added because of the wound lead wire of the probe, so that the inductance of a probe loop in the insulating base body can be reduced and the accuracy of test data of the probe is improved.

The invention discloses a test device for direct effect of vehicle-mounted lightning, which comprises measuring and controlling units, coupling units, an output terminal and a plurality of generator units. The generator units are connected to the coupling unit through a coaxial high-voltage cable, and the coupling unit and the output terminal are connected. The measuring and controlling unit is respectively connected to the generator unit and the coupling unit through the industrial field bus. The generator unit has a partitioned container square cabin structure, including a generator cabin, aDC power supply box and a generator body compartment. The generator cabin is provided with a generator which can be used for field generation. The coupling unit has a non-blocking square cabin structure, and the measuring and controlling unit has a shielded cabin structure. The test device for direct effect of vehicle-mounted lightning can be directly transported by the vehicle through lifting tothe test site for testing, or can be fixed in the laboratory for testing, and has lower loop inductance.

The invention discloses a high-frequency high-power packaging module and a manufacturing method thereof, and the high-frequency high-power packaging module comprises at least one power conversion bridge arm, at least one high-frequency capacitor, a multi-layer circuit board, an insulating heat-conducting plate and a plastic package body. The back surface of the semiconductor power device is in thermal connection or electric connection with the lower surface of the insulating heat-conducting plate, and the high-frequency capacitor is electrically connected with the first surface of the multi-layer circuit board or the second surface of the multi-layer circuit board or the lower surface of the insulating heat-conducting plate. And at least one electrode of the high-frequency capacitor is electrically connected with at least one electrode of the at least one semiconductor power device through the inner electric connection layer. According to the invention, the heat dissipation capability is guaranteed, the loop inductance is greatly reduced, high power and high frequency are realized, the advantages of a third-generation semiconductor are fully played, and an application basis is provided for the upgrading of the performance of the third-generation semiconductor.

The invention discloses a split composite bus bar suitable for diesel locomotive power module, which is composed of a DC bus bar and an AC bus bar. The DC bus bar and the AC bus bar adopt a split structure. The DC bus bar and the AC bus bar are both of flat structure, and a plurality of DC bus bars and the AC bus bars are stacked with each other and installed together through support pad columns arranged on the DC bus bar or the AC bus bar. The invention adopts the laminated composite bus bar to replace the cable, and the copper bar or the hot compressed bus bar are electrically connected, thereby reducing the complexity of the previous wiring, making the layout simple and the quality more reliable; The volume and weight of the system are reduced, and the repair and maintenance of the maincircuit are convenient. The invention adopts symmetrical design and is completely applicable to two power modules installed in a mirror image. The more important thing is to reduce the loop inductance, ensure the IGBT work safely and reliably, and greatly improve the reliability of the product. At present, it has been successfully applied in the diesel locomotive traction inverter + chopper module in a small batch, and has achieved good economic benefits.

Positive and negative power terminals protrude from a power terminal arrangement surface not facing a capacitor element. Positive and negative electrode bus bars gather with each other after at least one of them extends along a non-electrode surface of the capacitor element, and then run side by side in a bus bar parallel running section. The positive electrode bus bar runs in parallel with the negative electrode bus bar in the bus bar parallel running section, and then extends along the positive power terminal from the proximal end of the positive power terminal to the distal end thereof. The negative electrode bus bar runs in parallel with the positive electrode bus bar in the bus bar parallel running section, and then extends along the negative power terminal from the proximal end of the negative power terminal to the distal end thereof.

The invention discloses a substrate wiring terminal structure of a low-inductance power module. The structure comprises a first connecting terminal, a second connecting terminal and at least one double-layer power module substrate, part areas of the first connecting terminal and the second connecting terminal are arranged in a vertically spaced and overlapped manner, and a wiring end part is formed at the front end part. The tail end parts of the first connecting terminal and the second connecting terminal are sequentially provided with an extension part and a connecting part; the double-layerpower module substrate comprises a first substrate connecting area and a second substrate connecting area, the connecting part of the first connecting terminal and the first substrate connecting areaare connected into a whole, and the connecting part of the second connecting terminal and the second substrate connecting area are connected into a whole. The structure reduces the inductance of a system loop, effectively reduces the voltage peak at the moment when the IGBT module is turned off, reduces the switching loss, avoids electromagnetic interference, and guarantees the performance of a three-phase inversion driving system.

The invention discloses a mechanical direct-current switch cabinet of a distribution network. The circuit breaker comprises a circuit breaker chamber, a valve chamber, a bus chamber, a cable chamber and a control instrument chamber, the bus chamber and the control instrument chamber are positioned at the upper part of the cabinet body; the circuit breaker chamber and the valve chamber are locatedin the middle of the cabinet body, the cable chamber is located on the lower portion of the cabinet body, a power module for triggering loop energy supply and a control device are arranged in the control instrument chamber, a quick switch handcart and a contact box are arranged in the circuit breaker chamber, and a transfer branch, a lightning arrester and an energy supply transformer are arrangedin the valve chamber. The invention provides a distribution network mechanical direct-current switch cabinet which is compact in structure, reasonable in layout, convenient to assemble and maintain and safe and stable in operation.

The invention discloses a power module based on modular silicon carbide devices, and relates to the technical field of power electronics. The module comprises a machine shell, a high-frequency transformer, a support capacitor, a blocking capacitor, a laminated busbar, a plurality of SiC power devices and a radiator. The radiator is installed in the machine shell. The plurality of SiC power devicesare mounted on the surface of the radiator in the machine shell. The laminated busbar is arranged at the tops of the plurality of SiC power devices and is electrically connected with the plurality ofSiC power devices. The support capacitor is arranged at one side of the radiator in the machine shell and is electrically connected with the plurality of SiC power devices through the laminated busbar. The high-frequency transformer is installed in the machine shell. The blocking capacitor is installed in the machine shell and is connected between the SiC power device and the high-frequency transformer. The power module has the advantages of higher capacity, higher efficiency and smaller size, and is more suitable for being applied to a power grid.

The present invention is a novel brake chopper power unit, including a radiator, a composite busbar and a brake chopper main circuit. The power unit adopts a laminated modular design. Each power device in the circuit is installed on the surface of the radiator, and each power device connects all components of the brake chopper main circuit through a composite busbar and inputs and outputs externally. The invention adopts a simplified main circuit and a convenient and flexible circuit connection technology to unify the components and facilitate the expansion of the power unit; adopts a modular design of a stacked structure, saves space, facilitates maintenance and replacement, and reduces maintenance costs; The main circuit electrical technology reduces the stray inductance of the main circuit loop, improves the reliability of the main circuit, and completely avoids the difficulty of detouring cables in a narrow space. The structure is compact, the volume is reduced, and the design cost is reduced.

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.

A low-voltage protection switch has an external conductor section and a neutral conductor section, wherein a mechanical bypass switch is arranged in the external conductor section, and the semiconductor circuit device of the low-voltage protection switch is connected in parallel to the bypass switch. In the external conductor section A current measuring device is provided, which is connected to an electronic control unit of the protective switch, the electronic control unit being designed to actuate the bypass switch and the The semiconductor circuit arrangement provides that the undervoltage circuit breaker has at least one second current measuring device for measuring the first current through the bypass switch or the second current through the semiconductor circuit arrangement.

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.