CN117097110A

CN117097110A - High-power high-frequency power supply module

Info

Publication number: CN117097110A
Application number: CN202310959734.1A
Authority: CN
Inventors: 石运卓; 程存欣; 吕雁文; 王智鹏
Original assignee: CRRC Dalian R&D Co Ltd
Current assignee: CRRC Dalian R&D Co Ltd
Priority date: 2023-08-01
Filing date: 2023-08-01
Publication date: 2023-11-21

Abstract

The invention relates to a high-power high-frequency power supply module, which comprises a front-stage module and a rear-stage module; the front-stage module boosts the direct-current input network voltage through three-level DCDC, and then realizes soft switching control through half-bridge asymmetric LLC conversion to output single-phase inversion voltage; the output of the front-stage module is subjected to voltage conversion through a high-frequency transformer in an auxiliary high-frequency system, and the converted voltage is rectified by the rear-stage module through two groups of single-phase rectifier bridges and is inverted through a three-level IGBT to output a three-phase PWM wave. The high-power high-frequency power supply module can be suitable for a high-frequency auxiliary converter system with the power class of 135KVA to 280KVA and the input rated voltage of DC750V to DC1850V, and the whole structure and the wiring point do not need to be adjusted, and only need to increase or decrease corresponding internal devices according to different power and input voltage. In the concrete engineering production practice, the purposes of lean production, cost reduction and synergy of the product are realized.

Description

High-power high-frequency power supply module

Technical Field

The invention belongs to the field of full-automatic products, and relates to a high-power high-frequency power supply.

Background

The auxiliary power supply system of the rail transit vehicle and the rail transit vehicle of the trunk line is developing to the directions of platformization, light weight, miniaturization and high integration, and improves the utilization rate of the whole space of the vehicle and the utilization rate of the power supply of the vehicle to a great extent. For the auxiliary power supply system, the platform design meeting different network voltage input and output types is realized; and the manufacturing cost, maintainability and reliability index are improved.

In this context, a variety of auxiliary power system platforms have been developed, most mature batch products being power frequency auxiliary power systems, where the development of the power modules is the core part of the system.

The technical scheme in the first prior art is as follows:

the prior mature technical scheme is mainly applied to urban railway vehicles, and a high-frequency power module of the whole high-frequency auxiliary power supply system is realized by two sub-modules. The front-stage module is mainly a high-frequency voltage conversion part and realizes LLC soft switching function; the rear-stage module is an inversion output part and mainly realizes the function of outputting three-phase PWM waves.

In summary, the scheme converts 750V/1500V direct current into three-phase AC 380V alternating current to supply power to an air conditioning unit, an air compressor, a refrigerating fan convenient for a socket and some equipment and other three-phase loads on a subway train.

FIG. 1 is a schematic diagram of a prior art front-end module;

FIG. 2 is a schematic diagram of a prior art post-module;

drawbacks of the first prior art:

1. in the scheme, a two-level one-phase full-bridge asymmetric LLC design is adopted in a front-stage module, the design simplifies the whole module structure, but the ripple content in a circuit is higher, so that the volume and weight of inductive devices in the circuit are increased, the space utilization rate and weight of the whole auxiliary system are limited to a great extent, and the electric principle is shown in figure 1.

2. In the scheme, in a rear-stage module, a two-level three-phase full-bridge design is adopted, the output three-phase voltage is limited by IGBT switching frequency, harmonic content in the output three-phase voltage is higher, so that the volume and weight of an output filter reactor are increased, the space utilization rate and weight of the whole auxiliary system are also limited to a great extent, and an electric principle is shown in a figure 2.

The technical scheme of the second prior art is as follows:

patent CN202110949667 discloses an inverter power module, i.e. a rear-stage module, used in a high-frequency auxiliary converter device. The input of the module is single-phase alternating current output by the secondary side of a high-frequency isolation transformer in the high-frequency auxiliary converter equipment, and three-phase PWM waves are output.

Disadvantages of the second prior art

1. The inverter power module described in the patent is a rear-stage module in a high-frequency power supply system, and a front-stage module in high-frequency auxiliary converter equipment is not completely described;

2. the inversion module described in the patent adopts the traditional two-level three-phase full-bridge inversion technology based on IGBT, and the technology is limited by the switching frequency of a switching tube, so that the output harmonic content is higher, the volume and the weight of a rear-end three-phase filter reactor in the high-frequency auxiliary converter device are higher, and the output efficiency of the high-frequency auxiliary converter device is influenced;

3. The module adopts a multi-group cylindrical capacitor matching mode, and compared with a customized square capacitor, the mode has low space utilization rate, so that the power module has larger volume. In the design of the composite busbar, the copper layers of the positive and negative circulation loops of the busbar are required to be designed due to the structural assembly problem, and the composite busbar stacked connection is not realized on the electrical connection of the capacitor and the IGBT. The stray inductance on the busbar commutation circuit can rise due to the problems, and the service life of the IGBT electrical stress is influenced;

4. in this patent specification, the module is used in urban rail transit vehicles, and the overall structure such as the electrical interface arrangement, the radiator base plate arrangement, all mainly surround the forced air cooling heat dissipation form of the urban rail transit. Therefore, on the overall structure layout, the layout requirement of the water cooling structure commonly used by the locomotive trunk rail is difficult to meet.

Disclosure of Invention

In order to solve the problems, the invention adopts the following technical scheme: a high-power high-frequency power module comprises a front-stage module and a rear-stage module; the pre-stage module boosts the direct current input network voltage through three-level DCDC, and then realizes soft switching control through half-bridge asymmetric LLC conversion to output single-phase inversion voltage;

The output of the front stage module is subjected to voltage conversion by a high frequency transformer in an auxiliary high frequency system,

and the rear-stage module rectifies the converted voltage through two groups of single-phase rectifier bridges and outputs three-phase PWM waves through three-level IGBT inversion.

Further, the front-stage module comprises a first metal frame, an insulating terminal seat, an input positive copper bar, an input negative copper bar, a reactor input positive copper bar, a reactor output positive copper bar, a reactor input negative copper bar, a reactor output negative copper bar, a short copper bar I, a short copper bar II10, a high-frequency transformer primary side input first copper bar, a high-frequency transformer primary side input second copper bar, a high-frequency transformer primary side input third copper bar, a high-frequency transformer primary side input fourth copper bar, a voltage sensor I, a voltage sensor II, a current sensor, a first control electric connector, a first optical fiber connector, a first driving plate, an insulating support column, a supporting capacitor, a resonant capacitor, a first IGBT, a second IGBT, a laminated busbar, a first intermediate voltage stabilizing resistor, a short copper bar III, a first temperature relay, a supporting capacitor metal frame, a first radiator, a first positioning pin, a first water-cooling quick connector and a first air cooler;

The front-stage module comprises a first metal frame, an insulating terminal seat is fixed on a mounting point of the first metal frame, and an electrical insulating point of the insulating terminal seat is used for connecting an input positive copper bar, an input negative copper bar, a reactor input positive copper bar, a reactor output positive copper bar, a reactor input negative copper bar, a reactor output negative copper bar, a primary side input first copper bar of the high-frequency transformer and a primary side input second copper bar of the high-frequency transformer; the primary side of the high-frequency transformer is input into a third copper bar, and the primary side of the high-frequency transformer is input into a fourth copper bar;

one end of an input positive copper bar electric point is connected with a direct current input positive electrode external interface of a front-stage module, the other end of the input positive copper bar electric point is connected with an input positive copper bar of the reactor through a short-connection copper bar I, and a structural fixing point of the input positive copper bar is connected with a first metal frame 1 in a butt joint mode;

one end of the electric point of the input negative copper bar is connected with the external interface of the direct current input negative electrode of the front-stage module, the other end of the input negative copper bar is connected with the input negative copper bar of the reactor through a short-connection copper bar II, and the fixed point of the structure of the input negative copper bar is connected with the metal frame in a butt joint way;

the reactor input positive copper bar is used for connecting the front-stage module with a positive line input line of the boost reactor, and a fixed point of the reactor input positive copper bar structure is connected with the insulating terminal seat in a butt joint way;

One end of a positive copper bar of the reactor output is used for connecting a front-stage module with a positive line output line of the boosting reactor, the other end of the positive copper bar of the reactor output is connected with the positive electrode of the first IGBT to finish direct current input positive lap joint of a DCDC boosting loop, and a fixed point of the positive copper bar of the reactor output structure is connected with an insulating terminal seat in a butt joint way;

the reactor input negative copper bar is used for connecting the front-stage module with a boost reactor negative line input line, and a fixed point of the reactor input negative copper bar structure is connected with the insulating terminal seat in a butt joint way;

one end of a reactor output negative copper bar is used for connecting a front-stage module with a negative line output line of the boosting reactor, the other end of the reactor output negative copper bar is connected with the negative electrode of the first IGBT to finish direct current input negative lap joint of a DCDC boosting loop, and a fixed point of the reactor output negative copper bar structure is connected with an insulating terminal seat in a butt joint way;

the short connection copper bar I realizes short connection of an input rectifying copper bar and an input copper bar of the reactor, and a fixed point of a structure of the short connection copper bar I is connected with an insulating support column;

the short connection copper bar II realizes short connection of the input rectifying negative copper bar and the reactor input negative copper bar, and a fixed point of the short connection copper bar II structure is connected with an insulating support column in a butt joint manner;

one end of a primary side input first copper bar of the high-frequency transformer is connected with an external interface of a primary side input cable of the high-frequency transformer in the high-frequency auxiliary converter system, the other end of the primary side input first copper bar of the high-frequency transformer is connected with the resonant capacitor, and a fixing point of the primary side input first copper bar structure of the high-frequency transformer is connected with the insulating terminal seat in a connecting way;

One end of the primary side input second copper bar of the high-frequency transformer is connected with an external interface of a primary side input cable of the high-frequency transformer in the high-frequency auxiliary converter system, the other end of the primary side input second copper bar of the high-frequency transformer is connected with the resonance capacitor, and a fixing point of the primary side input second copper bar structure of the high-frequency transformer is connected with the insulation terminal seat in a connecting way;

one end of the primary side input second copper bar of the high-frequency transformer is connected with an external interface of a primary side input cable of the high-frequency transformer in the high-frequency auxiliary converter system, the other end of the primary side input third copper bar of the high-frequency transformer is connected with an output electrode of the second IGBT, and a fixing point of the primary side input third copper bar structure of the high-frequency transformer is connected with an insulating terminal seat in a butt joint manner;

one end of the primary side input fourth copper bar of the high-frequency transformer is connected with an external interface of a primary side input cable of the high-frequency transformer in the high-frequency auxiliary converter system, the other end of the primary side input fourth copper bar of the high-frequency transformer is connected with an output electrode of the second IGBT, and a fixing point of the primary side input fourth copper bar structure of the high-frequency transformer is connected with an insulating terminal seat in a butt joint manner;

the voltage sensor I1 is used for sampling a direct current bus, high-voltage sampling points of the voltage sensor I are respectively connected to an input positive copper bar and an input negative copper bar, low-voltage sampling feedback is connected to the control electric connector through a cable, and a voltage sensor I mounting point is fixed on the first metal frame;

The voltage sensor II1 is used for sampling voltage-sharing resistor buses, a high-voltage sampling point of the voltage-sharing resistor buses is connected with an anode, a cathode and a neutral point of the middle voltage-sharing resistor through a laminated bus, low-voltage sampling feedback is connected to a control electric connector through a cable, and a voltage sensor II mounting point is fixed on the first metal frame;

the current sensor is used for sampling the current of the direct current bus, outputting a positive copper bar through the reactor, and feeding back the low-voltage sampling to be connected to the first control electric connector through a cable, wherein a current sensor mounting point is fixed on the first metal frame;

the first control electric connector is used for completing the work of the communication interface of the electric signals of the front-stage module and the high-frequency auxiliary converter system, realizing integrated quick plug and pull at the same time, facilitating the maintenance and debugging work of the module, and the first control electric connector mounting point is fixed on the first metal frame;

the first optical fiber connector is used for completing the work of a communication interface of optical signals of the front-stage module and the high-frequency auxiliary variable-current system, and simultaneously realizing integral rapid plug, so that the module is convenient to maintain and debug, and the installation point of the optical fiber connector 19 is fixed on the metal frame;

the first driving board is used for carrying out driving logic control management on the first IGBT and the second IGBT, logic control of low-voltage to high-voltage output is realized by taking optical fiber signals emitted by the first optical fiber connector as input, and the mounting point is fixed on the first metal frame;

One end of the insulating support column is used for supporting the short-connection copper bar I and the short-connection copper bar II, and the other end of the insulating support column is fixed on the metal frame;

the support capacitor has reactive compensation, direct current filtering and current conversion effects on the front-stage module, the electric points of the support capacitor are connected with the positive copper layer, the negative copper layer and the neutral layer of the laminated busbar, and the support capacitor structure is fixed on the support capacitor metal frame;

one end of the electric point of the resonance capacitor is connected with the laminated busbar, and the primary side of the high-frequency transformer at the other end of the resonance capacitor is connected with the first copper bar or the primary side of the high-frequency transformer is connected with the second copper bar;

the first IGBT anode is connected with the reactor output positive copper bar, the first IGBT cathode is connected with the reactor output negative copper bar, the first IGBT output electrode is connected with the laminated busbar, and the first IGBT structure is fixed on the radiator;

the positive electrode and the negative electrode of the second IGBT are respectively connected with the positive copper layer and the negative copper layer of the laminated busbar, the output electrode of the second IGBT is connected with the primary input third copper bar of the high-frequency transformer or the primary input fourth copper bar of the high-frequency transformer, and the second IGBT structure is fixed on the first radiator;

the laminated busbar mainly realizes the electric logic connection among the first IGBT, the second IGBT, the supporting capacitor, the resonant capacitor and the middle voltage stabilizing resistor;

The first intermediate voltage stabilizing resistor realizes voltage sharing between the positive electrode and the neutral electrode of the supporting capacitor and between the negative electrode and the neutral electrode, and the first intermediate voltage stabilizing resistor is connected with the positive electrode, the negative electrode and the neutral layer of the laminated busbar respectively at the electric points, and the intermediate voltage stabilizing resistor structure is fixed on the radiator.

The short-connection copper bar III is used for series lap joint of the first IGBT;

the first temperature relay is automatically disconnected when the surface temperature of the radiator exceeds a design value, so that the front pole module has a temperature protection function, and the first temperature relay is fixed on the first radiator;

the supporting capacitor metal frame is used for fixing the supporting capacitor and is fixed on the metal frame;

the first radiator is used for radiating heat by the first IGBT, the second IGBT and the middle voltage stabilizing resistor, and is completely replaced by the air-cooled radiator;

the first locating pin is used for guiding when being in butt joint with the waterway connecting plate interface, and is arranged on the first radiator;

the first water-cooling quick connector is arranged on the first radiator.

Further: the rear-stage module comprises a second metal frame, an input insulating terminal seat, an input rectifying positive copper bar, an input rectifying negative copper bar, a high-voltage indicator positive copper bar, a high-voltage indicator negative copper bar, a three-phase output copper bar, an output insulating terminal seat, a second control electric connector, a second optical fiber connector, a voltage sensor, a supporting capacitor plate short circuit copper bar, a supporting capacitor plate insulating plate, a rectifying laminated busbar, an inversion laminated busbar, a rectifying diode, an IGBT (insulated gate bipolar transistor), a second driving plate, a driving plate supporting column, a surge capacitor, a second temperature relay, a second radiator, a second middle voltage stabilizing resistor, a second positioning pin, a second water-cooling quick connector and a second air cooling radiator;

The input insulating terminal seat is used for fixing the input rectifying positive copper bar and the input rectifying negative copper bar, and the input insulating terminal seat structure is fixed on the second radiator;

one end of the input rectifying copper bar is connected with an interface output by the secondary side of the high-frequency transformer, the other end of the input rectifying copper bar is connected with an input electrode of the rectifying diode, and the input rectifying copper bar structure is fixed on the input insulating terminal seat;

one end of the input rectifying negative copper bar is connected with an interface output by the secondary side of the high-frequency transformer, the other end of the input rectifying negative copper bar is connected with an input electrode of the rectifying diode, and the input rectifying negative copper bar structure is fixed on the input insulating terminal seat;

one end of the high-voltage indicator light copper bar is used for a high-voltage indicator light positive line external interface of the rear-stage module, the other end of the high-voltage indicator light copper bar is connected with the positive electrode of the supporting capacitor plate, and the high-voltage indicator light copper bar structure is fixed on the output insulating terminal seat;

one end of the high-voltage indicator lamp negative copper bar is connected with an external interface of a high-voltage indicator lamp negative wire, one end of the high-voltage indicator lamp negative copper bar is connected with the negative electrode of the supporting capacitor plate, and the high-voltage indicator lamp negative copper bar structure is fixed on the output insulation terminal seat;

one end of the three-phase output copper bar is used for an external interface of three-phase PWM wave output of the rear-stage module, the other end of the three-phase output copper bar is connected with the inversion laminated busbar, and the three-phase output copper bar structure is fixed on the output insulation terminal seat;

The output insulating terminal seat is used for fixing the positive copper bar of the high-voltage indicator lamp, the negative copper bar of the high-voltage indicator lamp and the three-phase output copper bar, and the structure of the output insulating terminal seat is fixed on the second metal frame;

the second control electric connector works with a communication interface of the electric signal of the high-frequency auxiliary converter system, and meanwhile, integral quick plug is realized, so that maintenance and debugging work of a later-stage module are facilitated, and an installation point is fixed on the second metal frame;

the second optical fiber connector is used for completing the work of a communication interface of the optical signals of the rear-stage module and the high-frequency auxiliary variable-current system, and simultaneously realizing integral rapid plug, and the mounting point is fixed on the second metal frame;

the high-voltage side of the voltage sensor is connected with the rectifying laminated busbar through a cable to sample the voltage of the second intermediate voltage stabilizing resistor 58, the low-voltage side is fed back to the system control unit through a second control electric connector, and the mounting point is fixed on the second metal frame;

the positive electrode, the negative electrode and the neutral electrode of the electric point of the supporting capacitor plate are respectively connected with the positive electrode, the negative electrode and the neutral layer of the rectifying laminated busbar, the supporting capacitor plate is welded on the PCB by adopting a plurality of groups of electrolytic capacitors, and the mounting point is fixed on the second metal frame;

the support capacitor plate short circuit copper bar is used for connecting two support capacitor plates in parallel;

The supporting capacitor plate insulating plate is used for fixing the supporting capacitor plate on the second metal frame;

the rectifying laminated busbar connects the output end of the rectifying diode, the anode, the cathode, the neutral pole and the supporting capacitor plate of the IGBT together to complete the construction of an inverse transformation current loop,

one end of the inversion laminated busbar is connected with the IGBT output point, and the other end of the inversion laminated busbar is connected with the three-phase output copper bar and is used for connecting the three-phase PWM wave output by the IGBT to an external interface of the module, namely the three-phase output copper bar;

the input end of the rectifying diode is connected with the input rectifying positive copper bar and the input rectifying negative copper bar, the positive pole and the negative pole of the rectifying diode are connected with the rectifying laminated busbar and used for rectifying single-phase alternating voltage into direct voltage, and the structure is fixed on the second radiator;

the positive electrode, the negative electrode and the neutral electrode of the IGBT input end are connected with the positive electrode, the negative electrode and the neutral layer of the inversion laminated busbar, the IGBT52 output end is connected with the inversion laminated busbar, the function of inverting the direct-current voltage into three-phase PWM waves is completed, T-shaped three-level encapsulation is adopted, and the IGBT structure is fixed on the second radiator;

the second driving plate is used for driving and controlling the IGBT and is fixed on the IGBT;

the driving plate support column plays an auxiliary supporting role on the second radiator for the second driving plate;

The surge capacitor is respectively connected to the positive electrode, the negative electrode and the neutral layer port of the inversion laminated busbar and used for absorbing the peak voltage when the IGBT is turned off;

when the surface temperature of the second radiator exceeds a preset threshold temperature, the radiator is automatically disconnected;

the second radiator is a rectifier diode, an IGBT and a second intermediate voltage stabilizing resistor for radiating,

the second intermediate voltage stabilizing resistor electrical points are respectively connected with the positive electrode, the negative electrode and the neutral layer of the rectifying laminated busbar and used for supporting the voltage equalizing effect among the positive electrode, the neutral layer and the negative electrode of the capacitor plate, and the second intermediate voltage stabilizing resistor structure is fixed on the second radiator;

the second locating pin is arranged on the second radiator under the guiding effect when being in butt joint with the waterway connecting plate interface;

the second water-cooling quick connector is arranged on the second radiator.

The high-frequency power supply module for the high-power high-frequency auxiliary system provided by the invention is composed of a high-frequency power supply module, and the high-frequency auxiliary system has great advantages in aspects of power supply density, volume, weight, cost and the like compared with a power frequency auxiliary system, and in recent years, along with the continuous improvement of technology, the high-frequency power supply module can gradually realize product application on urban rail transit and trunk railways, and has the following advantages:

first, the high-power high-frequency power module is suitable for the high-frequency auxiliary converter system with the apparent power of 135KVA to 280KVA and the input rated voltage of DC750V to DC1850V, and the whole structure and the wiring point are not required to be adjusted, and only the corresponding internal devices are required to be increased or reduced according to different power and input voltage. In the concrete engineering production practice, the purposes of lean production, cost reduction and synergy of the product are realized.

Secondly, the three-level DCDC boosting and T-shaped three-level inversion electric scheme adopted by the front stage module and the rear stage module in the high-power high-frequency power supply module composition is not only compact in structure, but also greatly reduces the volume and the weight of inductive elements in the high-frequency auxiliary current transformation system, so that the weight of the whole system is reduced by about 60 percent compared with that of a power frequency auxiliary current transformation system under the same parameters, the volume is reduced by about 40 percent, and the space utilization rate and the power density of the whole auxiliary current transformation system on a vehicle are greatly improved.

Third, the volume and weight of the inductive element mentioned in the second item are greatly reduced, and the purchase cost of the device is reduced by about 30%, so that the competitiveness of the whole equipment in the market is enhanced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art front-end module;

FIG. 2 is a schematic diagram of a prior art post-module;

FIG. 3 is a schematic diagram I of a front-stage module structure;

FIG. 4 is a schematic diagram II of a front stage module structure;

fig. 5 (a) a schematic diagram of a front module radiator and (b) a schematic diagram of a first air-cooled radiator;

FIG. 6 is a schematic diagram I of a rear module structure;

FIG. 7 is a schematic diagram II of a rear module structure;

fig. 8 (a) a schematic diagram of a rear module radiator structure and (b) a schematic diagram of a second air-cooled radiator;

FIG. 9 is a schematic diagram of a post-module support capacitor plate structure.

Reference numerals: 1 a first metal frame, 2, an insulating terminal block, 3, an input positive copper bar, 4, an input negative copper bar, 5, a reactor input positive copper bar, 6, a reactor output positive copper bar, 7, a reactor input negative copper bar, 8, a reactor output negative copper bar, 9, a short copper bar I,10, a short copper bar II,11, a high frequency transformer primary input first copper bar, 12, a high frequency transformer primary input second copper bar, 13, a high frequency transformer primary input third copper bar, 14, a high frequency transformer primary input fourth copper bar, 15, a voltage sensor I,16, a voltage sensor II,17, a current sensor, 18, a first control electrical connector, 19, a first optical fiber connector, 20, a first driving plate, 21, an insulating support column, 22, a support capacitor, 23, a resonance capacitor, 24, a first IGBT,25, a second IGBT,26, a laminated busbar, 27, a first intermediate stabilizing resistor, 28, short copper bars III,29, a first temperature relay, 30, a supporting capacitor metal frame, 31, a first radiator, 32, a first locating pin, 33, a first water-cooling quick connector, 34, a first air-cooling radiator, 35, a second metal frame 36, an input insulation terminal base, 37, an input rectification positive copper bar, 38, an input rectification negative copper bar, 39, a high-voltage indicator positive copper bar, 40, a high-voltage indicator negative copper bar, 41, a three-phase output copper bar, 42, an output insulation terminal base, 43, a second control electric connector, 44, a second optical fiber connector, 45, a voltage sensor, 46, a supporting capacitor plate, 47, a supporting capacitor plate short copper bar, 48, a supporting capacitor plate insulating plate, 49, a rectification laminated busbar, 50, an inversion laminated busbar, 51, a rectification diode, 52, an IGBT,53, a second driving plate, 54, a driving plate support column, 55. the surge capacitor, 56, the second temperature relay, 57, the second radiator, 58, the second intermediate voltage stabilizing resistor, 59, the second locating pin, 60, the second water-cooling quick connector, 61 and the second air-cooling radiator.

Detailed Description

It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other, and the present invention will be described in detail below with reference to the drawings and the embodiments.

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. Meanwhile, it should be clear that the dimensions of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present invention, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present invention: the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present invention.

FIG. 3 is a schematic diagram I of a front-stage module structure;

FIG. 4 is a schematic diagram II of a front stage module structure;

a high-power high-frequency power supply comprises a front-stage module, a high-frequency transformer and a rear-stage module;

the pre-stage module boosts the direct current input network voltage through three-level DCDC, and then realizes soft switching control through half-bridge asymmetric LLC conversion to output single-phase inversion voltage; the front-stage module is used as the primary side input of a high-frequency transformer in the high-frequency auxiliary converter system;

the high-frequency transformer performs voltage conversion on the single-phase inversion voltage output by the front-stage module;

and the back-stage module rectifies the converted voltage transmitted by the high-frequency transformer based on two groups of single-phase rectifier bridges and then inverts the voltage through a three-level IGBT to output three-phase PWM waves.

The front-stage module adopts a three-level series boosting technology (boost) and a half-bridge soft switch (LLC) asymmetric parallel output technology; the input modes of the rated 750V and 1500V direct current network voltage can be realized, the harmonic content in the input and output lines can be effectively restrained, and the volume and weight of inductive devices in the whole high-frequency auxiliary power supply system are reduced.

The rear-stage module adopts a T-shaped three-level three-phase inversion technology, and a single-phase rectifier bridge is integrated in the rear-stage module. The output harmonic content is effectively inhibited, the volume and the weight of the inductive device are reduced, the functionality, the integration level and the modularization of the module are optimized and improved, and the space utilization rate of the whole high-frequency auxiliary power supply system is enhanced.

The two modules adopt a low-inductance laminated busbar design in the whole frequency conversion current conversion circuit, and the connection mode is further optimized, so that the whole electrical fatigue life is prolonged. In the aspect of cooling mode, the design of the replaceable heat dissipation structure of forced air cooling and water cooling is adopted, and the device can be suitable for the application range of urban rail transit and locomotive trunk railways.

The front-stage module comprises a first metal frame 1, an insulating terminal seat 2, an input positive copper bar 3, an input negative copper bar 4, a reactor input positive copper bar 5, a reactor output positive copper bar 6, a reactor input negative copper bar 7, a reactor output negative copper bar 8, a short copper bar I9, a short copper bar II10, a high-frequency transformer primary side input first copper bar 11, a high-frequency transformer primary side input second copper bar 12, a high-frequency transformer primary side input third copper bar 13, a high-frequency transformer primary side input fourth copper bar 14, a voltage sensor I15, a voltage sensor II16, a current sensor 17, a first control electric connector 18, a first optical fiber connector 19, a first driving plate 20, an insulating support column 21, a support capacitor 22, a resonant capacitor 23, a first IGBT24, a second IGBT 25, a laminated busbar 26, a first intermediate voltage stabilizing resistor 27, short copper bars III and 28, a first temperature relay 29, a support capacitor metal frame 30, a first radiator 32, a first positioning pin 32, a first water cooling pin 33 and a first cooling pin 33.

The first metal frame 1 is used for installing a front-stage module and a high-frequency auxiliary system and fixing internal wiring and devices of other components of the front-stage module;

the installation point of the insulating terminal seat 2 is fixed on the first metal frame 1, and the electric insulating point is used for connecting an input positive copper bar 3, an input negative copper bar 4, a reactor input positive copper bar 5, a reactor output positive copper bar 6, a reactor input negative copper bar 7, a reactor output negative copper bar 8, a high-frequency transformer primary side input first copper bar 11 and a high-frequency transformer primary side input second copper bar 12; the primary side of the high-frequency transformer is input into a third copper bar 13, and the primary side of the high-frequency transformer is input into a fourth copper bar 14;

one end of the electric point of the input positive copper bar 3 is connected with an external interface of a direct current input positive electrode of the front-stage module, the other end of the electric point of the input positive copper bar 3 is connected with the input positive copper bar 5 of the reactor through a short-connection copper bar I9, and a structural fixing point of the input positive copper bar 3 is connected with the first metal frame 1 in a butt joint way;

one end of an electric point of the input negative copper bar 4 is connected with an external interface of a direct current input negative electrode of a front-stage module, the other end of the input rectifying negative copper bar 4 is connected with an input negative copper bar 7 of the reactor through a short-connection copper bar II10, and a fixed point of a structure of the input rectifying negative copper bar 4 is connected with the metal frame 1 in a butt joint way;

The reactor input positive copper bar 5 is used for connecting a front-stage module with a positive line input line of the boost reactor, and a fixed point of the structure of the reactor input positive copper bar 5 is connected with the insulating terminal base 2 in a butt joint manner;

one end of a reactor output positive copper bar 6 is used for connecting a front-stage module with a positive line output line of a boosting reactor, the other end of the reactor output positive copper bar 6 is connected with the positive electrode of a first IGBT24 to finish direct current input positive lap joint of a DCDC boosting circuit, and a fixed point of the structure of the reactor output positive copper bar 6 is connected with an insulating terminal seat 2;

the reactor input negative copper bar 7 is used for connecting a front-stage module with a boost reactor negative line input line, and a fixed point of the structure of the reactor input negative copper bar 7 is connected with the insulating terminal base 2 in a butt joint manner;

one end of a reactor output negative copper bar 8 is used for connecting a front-stage module with a negative line output line of a boosting reactor, the other end of the reactor output negative copper bar 8 is connected with the negative electrode of a first IGBT24 to finish direct current input negative lap joint of a DCDC boosting loop, and a fixed point of the structure of the reactor output negative copper bar 8 is connected with an insulating terminal seat 2 in a butt joint way;

the short connection copper bar I9 realizes the short connection of the input rectifying copper bar 3 and the reactor input copper bar 5, and the fixed point of the short connection copper bar I9 structure is connected with the insulating support column 21;

The short connection copper bar II10 realizes the short connection of the input rectifying negative copper bar 4 and the reactor input negative copper bar 7, and the fixed point of the structure of the short connection copper bar II10 is connected with the insulating support column 21;

one end of a primary side input first copper bar 11 of the high-frequency transformer is connected with an external interface of a primary side input cable of the high-frequency transformer in the high-frequency auxiliary converter system, the other end of the primary side input first copper bar 11 of the high-frequency transformer is connected with a resonant capacitor 23, and a fixed point of a primary side input first copper bar 11 structure of the high-frequency transformer is connected with an insulating terminal seat 2 in a butt joint manner;

one end of the primary side input second copper bar 12 of the high-frequency transformer is used for being connected with an external interface of a primary side input cable of the high-frequency transformer in the high-frequency auxiliary converter system, the other end of the primary side input second copper bar 12 of the high-frequency transformer is connected with the resonance capacitor 23, and a fixed point of the primary side input second copper bar 12 structure of the high-frequency transformer is connected with the insulated terminal seat 2 in a butt joint way;

one end of the primary side input third copper bar 13 of the high-frequency transformer is connected with an external interface of a primary side input cable of the high-frequency transformer in the high-frequency auxiliary converter system, the other end of the primary side input third copper bar 13 of the high-frequency transformer is connected with an output electrode of the second IGBT25, and a fixed point of the primary side input third copper bar 13 structure of the high-frequency transformer is connected with the insulated terminal seat 2 in a butt joint manner;

One end of the primary side input fourth copper bar 14 of the high-frequency transformer is connected with an external interface of a primary side input cable of the high-frequency transformer in the high-frequency auxiliary converter system, the other end of the primary side input fourth copper bar 14 of the high-frequency transformer is connected with an output electrode of the second IGBT25, and a fixed point of the structure of the primary side input fourth copper bar 14 of the high-frequency transformer is connected with the insulated terminal seat 2 in a butt joint manner;

the voltage sensor I15 is used for sampling a direct current bus, high-voltage sampling points of the voltage sensor I15 are respectively connected to the input copper bar 3 and the input negative copper bar 4, low-voltage sampling feedback is connected to the 18-control electric connector through a cable, and a voltage sensor I15 mounting point is fixed on the first metal frame 1;

the voltage sensor II16 is used for sampling voltage-sharing resistor buses, a high-voltage sampling point of the voltage-sharing resistor bus is connected with the positive electrode, the negative electrode and the neutral point of the middle voltage-stabilizing resistor 27 through the laminated bus 26, low-voltage sampling feedback is connected with the control electric connector 18 through cables, and a voltage sensor II16 mounting point is fixed on the first metal frame 1;

the current sensor 17 is used for sampling direct current bus current, a positive copper bar 6 is output through a reactor, low-voltage sampling feedback is connected to the first control electric connector 18 through a cable, and a mounting point of the current sensor 17 is fixed on the first metal frame 1;

The first control electric connector 18 is used for completing the work of the communication interface of the electric signals of the front-stage module and the high-frequency auxiliary current transformation system, and simultaneously realizing integral quick plug, so that the module is convenient to maintain and debug, and the mounting point of the first control electric connector 18 is fixed on the first metal frame 1;

the first optical fiber connector 19 is used for completing the work of a communication interface of optical signals of the front-stage module and the high-frequency auxiliary variable-current system, and simultaneously realizing integral rapid plug, so that the module is convenient to maintain and debug, and the installation point of the optical fiber connector 19 is fixed on the 1 metal frame;

the first driving board 20 is used for performing driving logic control management on the first IGBT24 and the second IGBT25, and logic control of low-voltage to high-voltage output is realized by taking optical fiber signals of the first optical fiber connector transmission 19 as input, and the mounting point is fixed on the first metal frame 1;

one end of the insulating support column 21 is used for supporting the short-circuit copper bar I9 and the short-circuit copper bar II10, and the other end of the insulating support column 21 is fixed on the 1-metal frame;

the support capacitor 22 has reactive compensation, direct current filtering and current conversion functions on the front-stage module, the electric points of the support capacitor 22 are connected with the positive copper layer, the negative copper layer and the neutral layer of the laminated busbar 26, and the support capacitor 22 is structurally fixed on the support capacitor metal frame 30;

The resonant capacitor 23 plays a decisive role in realizing a soft switch on LLC control of a front-stage module, is a key device of a resonant circuit, one end of an electric point of the resonant capacitor 23 is connected with the laminated busbar 26, and the other end of the resonant capacitor 23 is connected with the primary side input first copper bar 11 of the high-frequency transformer or the primary side input second copper bar 12 of the high-frequency transformer;

the first IGBT24 is a switching power device of a DCDC boosting link of a front-stage module and mainly plays a role in three-level boosting logic control, the positive electrode of the first IGBT24 is connected with the positive copper bar 6 of the reactor output, the negative electrode of the first IGBT24 is connected with the negative copper bar 8 of the reactor output, the output electrode of the first IGBT24 is connected with the laminated busbar 26, and the first IGBT24 is structurally fixed on the first radiator 30;

the second IGBT25 is a switching power device of an LLC output link of a front-stage module and mainly plays a role in soft switching control of the output link, the positive electrode and the negative electrode of the second IGBT25 are respectively connected with the positive copper layer and the negative copper layer of the laminated busbar 26, the output electrode of the second IGBT25 is connected with the primary side input 1 of the high-frequency transformer, the primary side input 13 of the high-frequency transformer or the primary side input 14 of the high-frequency transformer, and the second IGBT25 is structurally fixed on the radiator 31;

the laminated busbar 26 mainly realizes the electric logic connection among the first IGBT24, the second IGBT25, the supporting capacitor 22, the resonant capacitor 23 and the intermediate voltage stabilizing resistor 27, so that stray inductance in a current conversion loop can be effectively reduced, peak voltage when the first IGBT24 and the second IGBT25 are turned off is reduced, and the reliability of the current conversion loop is improved;

The first intermediate voltage stabilizing resistor 27 realizes voltage sharing between the positive electrode and the neutral electrode of the supporting capacitor 22 and between the negative electrode and the neutral electrode, and the electric point of the first intermediate voltage stabilizing resistor 27 is respectively connected with the positive electrode, the negative electrode and the neutral layer of the laminated busbar 26, and the intermediate voltage stabilizing resistor 27 is structurally fixed on the 31 radiator.

The short copper bar III28 is used for series overlap of the first IGBT 24;

the first temperature relay 29 is used for protecting the heat design of the front pole module, and is automatically disconnected when the surface temperature of the radiator exceeds a threshold temperature, so that the front pole module has a temperature protection function, and the first temperature relay 29 is fixed on the first radiator 31;

the supporting capacitor metal frame 30 is used for fixing the supporting capacitor 22, and the supporting capacitor metal frame 30 is fixed on the metal frame 1;

the first radiator 31 is configured to radiate heat from the first IGBT24, the second IGBT25, and the intermediate voltage stabilizing resistor 27, as shown in fig. 5 (a) a schematic diagram of a front module radiator and (b) a schematic diagram of a first air-cooled radiator; as shown, the first radiator 31 can be completely replaced by the air-cooled radiator 34, so that the universality of the module under different cooling conditions is improved;

the first positioning pin 32 is used for guiding the front-stage module when being in butt joint with the high-frequency auxiliary current transformer system main waterway and the waterway connecting plate interface, and the first positioning pin 32 is arranged on the first radiator 31;

The first water-cooling quick connector 33 is used for quickly installing and detaching the module without draining liquid when the front-stage module needs to be installed or maintained in the high-frequency auxiliary converter system, and the first water-cooling quick connector 33 is installed on the first radiator 31.

The first air-cooled radiator 34 can be replaced 31 with the first radiator according to actual requirements

FIG. 6 is a schematic diagram I of a rear module structure;

FIG. 7 is a schematic diagram II of a rear module structure;

The rear-stage module comprises a second metal frame 35, an input insulating terminal seat 36, an input rectifying positive copper bar 37, an input rectifying negative copper bar 38, a high-voltage indicator positive copper bar 39, a high-voltage indicator negative copper bar 40, a three-phase output copper bar 41, an output insulating terminal seat 42, a second control electric connector 43, a second optical fiber connector 44, a voltage sensor 45, a supporting capacitor plate 46, a supporting capacitor plate short circuit copper bar 47, a supporting capacitor plate insulating plate 48, a rectifying laminated busbar 49, an inverting laminated busbar 50, a rectifying diode 51, an IGBT52, a second driving plate 53, a driving plate supporting column 54, a surge capacitor 55, a second temperature relay 56, a second radiator 57, a second intermediate voltage stabilizing resistor 58, a second positioning pin 59, a second water-cooling quick connector 60 and a second air-cooling radiator 61.

And the input of the rear-stage module is output from the secondary side of a high-frequency transformer in the high-frequency auxiliary converter system, and after being rectified by two groups of single-phase rectifier bridges in the rear-stage module, the three-phase PWM waves are finally output through three-level IGBT inversion.

The second metal frame 35 is used for installing a rear module and a high-frequency auxiliary system, and fixing wires and devices inside the rear module;

the input insulating terminal seat 36 is used for fixing the input rectifying positive copper bar 37 and the input rectifying negative copper bar 38, and the input insulating terminal seat 36 is structurally fixed on the 23 radiator;

one end of the input rectifying copper bar 37 is used for connecting an interface from the secondary side output of a high-frequency transformer in the high-frequency auxiliary converter system, the other end of the input rectifying copper bar 37 is connected with the input electrode of the rectifying diode 51, and the structure of the input rectifying copper bar 37 is fixed on the input insulating terminal seat 36;

one end of an input rectifying negative copper bar 37 is used for connecting an interface from the secondary side output of a high-frequency transformer in the high-frequency auxiliary converter system, the other end of the input rectifying negative copper bar 37 is connected with the input pole of a rectifying diode 51, and the structure of the input rectifying negative copper bar 37 is fixed on an input insulating terminal seat 36;

one end of the high-voltage indicator light copper bar 39 is used for a high-voltage indicator light positive line external interface of a rear-stage module, the other end of the high-voltage indicator light copper bar 39 is connected with the positive electrode of the supporting capacitor plate 46, and the high-voltage indicator light copper bar 39 is structurally fixed on the output insulating terminal base 42;

One end of the high-voltage indicator lamp negative copper bar 38 is used for an external interface of a high-voltage indicator lamp negative line of the rear-stage module, one end of the high-voltage indicator lamp negative copper bar 38 is connected with the negative electrode of the supporting capacitor plate 46, and the high-voltage indicator lamp negative copper bar 38 is structurally fixed on the output insulating terminal base 42;

one end of a three-phase output copper bar 41 is used for an external interface of three-phase PWM wave output of a rear-stage module, the other end of the three-phase output copper bar 41 is connected with an inversion laminated busbar 50, and the three-phase output copper bar 41 is structurally fixed on an 8-output insulating terminal seat 42;

the output insulating terminal block 42 is used for fixing the high-voltage indicator lamp positive copper bar 39, the high-voltage indicator lamp negative copper bar 40 and the three-phase output copper bar 41, and the output insulating terminal block 42 is structurally fixed on the second metal frame 35;

the second control electrical connector 43 is used for completing the work of the communication interface between the post-stage module and the electric signal of the high-frequency auxiliary current transformation system, and simultaneously realizing integral rapid plug, so that the post-stage module is convenient to maintain and debug, and the mounting point is fixed on the second metal frame 43;

the second optical fiber connector 44 is used for completing the work of the communication interface between the rear-stage module and the optical signal of the high-frequency auxiliary converter system, and simultaneously realizing integral rapid plug, so that the module is convenient to maintain and debug, and the mounting point is fixed on the second metal frame 35;

The high-voltage side of the voltage sensor 45 is connected with the rectifying laminated busbar 49 through a cable to sample the voltage of the second intermediate voltage stabilizing resistor 58, the low-voltage side is fed back to the system control unit through the second control electric connector 43, and the mounting point is fixed on the second metal frame 35;

the supporting capacitor plate 46 has a filtering effect on the rectified direct current network voltage, and is used for reactive compensation in an inversion link, so that the power factor of a rear-stage module is improved. The positive electrode, the negative electrode and the neutral electrode of the electric points of the supporting capacitor plate 46 are respectively connected with the positive electrode, the negative electrode and the neutral layer of the rectifying laminated busbar 49, the supporting capacitor plate 46 is welded on the PCB by adopting a plurality of groups of electrolytic capacitors and is arranged in parallel to reach a final design capacity value, the advantages of small volume and light weight are achieved, meanwhile, the number of the electric handle joints of the rectifying laminated busbar 49 is simplified, stray inductance of the busbar itself is optimized, and the mounting points are fixed on the second metal frame 35;

the supporting capacitor plate short circuit copper bar 47 is used for connecting two supporting capacitor plates 46 in parallel;

the supporting capacitor plate insulating plate 48 is used for fixing the supporting capacitor plate 46 to the second metal frame 35;

the rectifying laminated busbar 49 connects the output end of the rectifying diode 51, the positive electrode, the negative electrode and the neutral electrode of the IGBT52 and the supporting capacitor plate 46 together to complete the construction of an inverse transformation current loop, and the rectifying laminated busbar 49 can effectively reduce stray inductance in the current transformation loop, reduce peak voltage when the 18IGBT is turned off and improve the reliability of the current transformation loop;

One end of the inversion laminated busbar 49 is connected with the output point of the IGBT52, and the other end of the inversion laminated busbar 49 is connected with the three-phase output copper bar 41, so that the three-phase PWM wave output by the IGBT52 is connected to an external interface of the module, namely the three-phase output copper bar 41. By utilizing the compact structural design advantage of the busbar, compared with the traditional copper busbar, the space size caused by electric gap, creepage and complicated structural modeling is optimized;

the input end of the rectifying diode 51 is connected with the input rectifying positive copper bar 37 and the input rectifying negative copper bar 38, the positive end and the negative end of the rectifying diode 51 are connected with the rectifying laminated busbar 49, and are used for rectifying single-phase alternating voltage into direct voltage, and the structure is fixed on the second radiator 57;

the positive pole, the negative pole and the neutral pole of the input end of the IGBT52 are connected with the positive pole, the negative pole and the neutral layer of the inversion laminated busbar 50, the output end of the IGBT52 is connected with the inversion laminated busbar 50 to finish the function of inverting the direct-current voltage into three-phase PWM waves, T-shaped three-level encapsulation is adopted, the harmonic content of the output voltage can be effectively restrained while the inversion efficiency of a rear-stage module is improved by improving the switching frequency, so that the volume and the weight of a three-phase filter inductive device in a high-frequency auxiliary current transformation system are optimized, and the IGBT52 structure is fixed on the second radiator 57;

The second driving board 53 is used for driving and controlling the IGBT52, and is fixed on the IGBT 52;

the drive plate support columns 54 serve as auxiliary support for the second drive plate 53 on the second heat sink 57;

the surge capacitor 55 is respectively connected to the positive electrode, the negative electrode and the neutral layer port of the inversion laminated busbar 50 and is used for absorbing peak voltage when the IGBT52 is turned off;

the second temperature relay 56 realizes the thermal design protection of the rear-stage module, and is automatically disconnected when the surface temperature of the second radiator 57 exceeds a design value, so that the module has a temperature protection function, and the structure is fixed on the second radiator 57;

the radiator 57 is used for radiating the rectifier diode 51, the IGBT52 and the second intermediate voltage stabilizing resistor 58, and the module radiator can be completely replaced by the second air cooling radiator 59, so that the universality of the module under different cooling conditions is improved;

the second intermediate voltage stabilizing resistor 58 is electrically connected with the positive electrode, the negative electrode and the neutral layer of the rectifying laminated busbar 49 respectively, and is used for supporting the voltage equalizing effect among the positive electrode, the neutral layer and the negative electrode of the capacitor plate 46, and the second intermediate voltage stabilizing resistor 58 is structurally fixed on the second radiator 57;

the second positioning pin 59 is used for guiding the rear module when being in butt joint with the high-frequency auxiliary current transformation system main waterway and is arranged on the second radiator 57 when being in butt joint with the waterway connecting plate interface;

The second water-cooled quick connector 60 is used for quickly installing and detaching the rear module on the second radiator 57 without draining liquid when the rear module needs to be installed or maintained in the high-frequency auxiliary converter system.

The second air-cooled radiator 61 can be replaced with the second radiator 57 according to actual requirements.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.

Claims

1. A high power high frequency power module, characterized by: the system comprises a front-stage module and a rear-stage module;

the pre-stage module boosts the direct current input network voltage through three-level DCDC, and then realizes soft switching control through half-bridge asymmetric LLC conversion to output single-phase inversion voltage;

2. A high power high frequency power supply module according to claim 1, characterized in that: the high-power high-frequency power supply module is characterized in that: the front-stage module comprises a first metal frame, an insulating terminal seat, an input positive copper bar, an input negative copper bar, a reactor input positive copper bar, a reactor output positive copper bar, a reactor input negative copper bar, a reactor output negative copper bar, a short-connection copper bar I, a short-connection copper bar II10, a high-frequency transformer primary side input first copper bar, a high-frequency transformer primary side input second copper bar, a high-frequency transformer primary side input third copper bar, a high-frequency transformer primary side input fourth copper bar, a voltage sensor I, a voltage sensor II, a current sensor, a first control electric connector, a first optical fiber connector, a first driving plate, an insulating support column, a supporting capacitor, a resonant capacitor, a first IGBT, a second IGBT, a laminated busbar, a first intermediate voltage stabilizing resistor, a short-connection copper bar III, a first temperature relay, a supporting capacitor metal frame, a first radiator, a first positioning pin, a first water-cooling quick connector and a first air cooler;

the first water-cooling quick connector is arranged on the first radiator.

3. A high-power high-frequency power supply according to claim 1, characterized in that: the high-power high-frequency power supply is characterized in that:

the rear-stage module comprises a second metal frame, an input insulating terminal seat, an input rectifying positive copper bar, an input rectifying negative copper bar, a high-voltage indicator positive copper bar, a high-voltage indicator negative copper bar, a three-phase output copper bar, an output insulating terminal seat, a second control electric connector, a second optical fiber connector, a voltage sensor, a supporting capacitor plate short circuit copper bar, a supporting capacitor plate insulating plate, a rectifying laminated busbar, an inversion laminated busbar, a rectifying diode, an IGBT (insulated gate bipolar transistor), a second driving plate, a driving plate supporting column, a surge capacitor, a second temperature relay, a second radiator, a second middle voltage stabilizing resistor, a second positioning pin, a second water-cooling quick connector and a second air cooling radiator;

one end of the inversion laminated busbar is connected with the IGBT output point, and the other end of the inversion laminated busbar is connected with the three-phase output copper bar, and is used for connecting the three-phase PWM wave output by the IGBT to an external interface of the module, namely the three-phase output copper bar 41;

the second water-cooling quick connector is arranged on the second radiator.