Integrated double-H-bridge power unit module

Abstract

According to the integrated double-H-bridge power unit module, two three-phase rectifier bridges and H-bridge modules are mounted on a radiator to form a double-H-bridge loop, so that double-module series output is realized, and the power density is improved; the module adapter plate realizes integrated and modular design, and the production efficiency is improved; main loop current terminals are welded around the control terminals, so that the interference of a main loop to a driving control loop is reduced; the bypass power relay meets bypass output when a fault occurs; the filtering energy storage capacitors are divided into two groups and respectively provide energy storage and filtering for the corresponding H-bridge inverters; independent two-way unit inputs are connected with a fast fuse through an input cable, a cable sheath is installed at a via hole of a main shell, and the cable is deformed and limited through a cable supporting piece in the main shell; the power unit module has the advantages of being high in power density, high in integration, high in installation efficiency, convenient to overhaul and the like on the premise that the structural strength and the electrical performance are met, and the problems that a power unit module is large in element number, low in power density, large in size and complex in installation are solved.

Description

Technical Field

[0001] The invention relates to a power conversion device for frequency conversion speed regulation of high-power, high-voltage AC asynchronous motors, and in particular to an integrated double H-bridge power unit module with high power density and high integration, belonging to the technical field of high-voltage frequency conversion. Background Art

[0002] High-voltage inverters are one of the main technical means for speed control of high-power motors at this stage. The power unit module, as the core of the main circuit rectification and inversion, is related to the stable operation of the inverter equipment. With the continuous development of drive control technology, inverters tend to be miniaturized, energy-saving and environmentally friendly. However, the power unit modules of the current mainstream inverter systems are all H-bridge structures. There are many cascaded power unit modules, and the structure is complex, which makes it difficult to adapt to the current low-carbon and environmentally friendly era needs. In addition, there are many components, complex installation and maintenance, and high price costs. Summary of the invention

[0003] In order to solve the above problems, the present invention is an integrated dual H-bridge power unit module, and its technical solution is as follows: it includes a main housing, on which a capacitor fixing plate, a filter energy storage capacitor, a capacitor parallel PCB board, a left side plate, an input cable, a right side plate, an output cable, a main circuit internal cable, a cable support, a through-wall terminal, a radiator, an adapter board support column, a three-phase rectifier bridge + H-bridge module, a module adapter board, a bypass power relay, a fast fuse, an absorption capacitor, a connecting row, a current terminal, a control terminal, a control drive board, a shielding plate and a cable sheath are installed. The radiator is installed in the upper middle part of the main housing, and two three-phase rectifier bridges + H-bridge modules are installed on the radiator to form a double H-bridge circuit to achieve double-module series output; A module adapter board is fixed on each three-phase rectifier bridge + H-bridge module. An adapter board support column is provided on one side of the module adapter board. The module adapter board is fixedly connected to the main housing and the radiator through the adapter board support column, which is beneficial to improve the strength of the module adapter board and ensure the tight connection of the wiring terminals; Install bypass power relay, fast fuse, current terminal and control terminal on the module adapter board; install bypass power relay at the front end of the module adapter board to bypass output in case of fault; install control terminal inside the module adapter board, fix main circuit current terminal around the control terminal, which is conducive to reducing the interference of main circuit on drive control circuit; A capacitor fixing plate is provided at the bottom of the main housing, and the filter energy storage capacitor is installed on the capacitor fixing plate; The filter energy storage capacitors are divided into two groups, which provide energy storage and filtering for the corresponding three-phase rectifier bridge + H-bridge modules; Each group of filter energy storage capacitors is connected in parallel through a capacitor parallel PCB board. The positive and negative current terminals of the module adapter board rectifier bridge are connected to one end of the capacitor parallel PCB board through the internal cables or copper bars of the main circuit. The module adapter board H-bridge input current terminals are connected to the other end of the capacitor parallel PCB board through a connecting bar. At the same time, the module adapter board H-bridge input current terminals are installed with absorption capacitors, which is conducive to making full use of the energy storage and filtering of each filter energy storage capacitor.

[0004] Furthermore, the unit module is provided with two independent unit inputs, which are respectively connected to the fast fuse through input cables; The through-wall terminal is installed on the upper front part of the main housing, the two H-bridge outputs are connected in series through cables, and the output at the other end of the H-bridge module is connected through the output cable.

[0005] Furthermore, the rear end bottom of the main shell is an inverted "X"-shaped opening, which is convenient for installation and positioning of the whole machine; a cable sheath is installed at the through hole of the main shell, and the cable is shaped and limited by the cable support inside; a left panel and a right panel are installed on the left and right sides of the main shell respectively.

[0006] Furthermore, the shielding plate is installed at the upper right side of the main shell and directly above the module adapter plate, and simultaneously drives and protects the two H bridges; the control driving board is installed on the upper part of the shielding plate.

[0007] The beneficial effects of the present invention are as follows: the present invention is an integrated dual H-bridge power unit module, two three-phase rectifier bridges + H-bridge modules are installed on a radiator to form a dual H-bridge circuit, realize dual-module series output, and is beneficial to improving power density; the module adapter board realizes integrated and modular design, which is beneficial to improving production efficiency; the main circuit current terminals are welded around the control terminals, which is beneficial to reducing the interference of the main circuit on the drive control circuit; the bypass power relay meets the bypass output in case of a fault; the filter energy storage capacitor is divided into two groups, which provide energy storage and filtering for the corresponding H-bridge inverter respectively; the independent two-way unit input is connected to the fast fuse through the input cable, and the cable sheath is installed at the through hole of the main shell, and the cable is shaped and limited by the cable support inside; the present invention meets the single-module dual H-bridge structure, reduces the number of components, and takes into account the compactness, easy maintenance, strong adaptability of the structure, and the easy installation and replaceability of the electrical structure. It has the characteristics of compact structure, easy assembly, good electrical performance, etc., and solves the problems of large number of components in the power unit module, low power density, large size, and complex installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the unit structure of the present invention; Figure 2 It is a schematic diagram of the unit structure decomposition of the present invention; Figure 3 It is a side view of the internal structure of the present invention; Figure 4It is a circuit connection schematic diagram of the present invention; As shown in the figure, 1 capacitor fixing plate, 2 filter energy storage capacitor, 3 capacitor parallel PCB board, 4 main shell, 5 left side plate, 6 input cable, 7 right side plate, 8 output cable, 9 main circuit internal cable, 10 cable support, 11 through-wall terminal, 12 radiator, 13 adapter board support column, 14 three-phase rectifier bridge + H bridge module, 15 module adapter board, 16 bypass power relay, 17 fast fuse, 18 absorption capacitor, 19 connection row, 20 current terminal, 21 control terminal, 22 control drive board, 23 shielding plate, 24 cable sheath. DETAILED DESCRIPTION

[0009] As shown in the figure, the present invention is an integrated dual H-bridge power unit module, including: a capacitor fixing plate 1, a filter energy storage capacitor 2, a capacitor parallel PCB board 3, a main shell 4, a left side plate 5, an input cable 6, a right side plate 7, an output cable 8, a main circuit internal cable 9, a cable support 10, a through-wall terminal 11, a radiator 12, an adapter board support column 13, a three-phase rectifier bridge + H-bridge module 14, a module adapter board 15, a bypass power relay 16, a fast fuse 17, an absorption capacitor 18, a connecting row 19, a current terminal 20, a control terminal 21, a control drive board 22, a shielding plate 23 and a cable sheath 24.

[0010] The radiator 12 is installed in the upper middle part of the main housing 4, and two three-phase rectifier bridges + H-bridge modules 14 are installed on the radiator 12 to form a double H-bridge loop, realizing double-module series output, which is beneficial to improving power density.

[0011] A module adapter plate 15 is welded on the top of each three-phase rectifier bridge + H-bridge module 14, and a fast fuse 17, a current terminal 20, a control terminal 21, a bypass power relay 16, etc. are installed on the top of the module adapter plate 15, realizing an integrated and modular design, which is conducive to improving production efficiency.

[0012] The control terminal 21 is welded inside the module adapter board 15 , and the main circuit current terminal 20 is welded around it, which is beneficial to reduce the interference of the main circuit on the drive control circuit.

[0013] A bypass power relay 16 is installed at the front end of the module adapter board 15 to meet the bypass output in case of fault; the module adapter board 15 is fixedly connected to the main housing 4 and the radiator 12 through the adapter board support column 13, which is beneficial to improve the strength of the module adapter board 15 and ensure the tight connection of the terminal.

[0014] The filter energy storage capacitor 2 is installed at the bottom of the main housing 4 and is connected to the main housing 4 through the capacitor fixing plate 1. The filter energy storage capacitor 2 is divided into two groups, which provide energy storage and filtering for the corresponding three-phase rectifier bridge + H bridge module 14 respectively; the filter energy storage capacitor 2 is connected in parallel through the capacitor parallel PCB board 3, and the positive and negative current terminals 20 of the module adapter board 15 rectifier bridge are connected to one end of the capacitor parallel PCB board 3 through the main circuit internal cable 9 or copper busbar, and the module adapter board 15H bridge input current terminal 20 is connected to the other end of the capacitor parallel PCB board 3 through the connecting row 19. At the same time, the module adapter board 15H bridge input current terminal 20 is installed with an absorption capacitor 18, which is conducive to making full use of the energy storage and filtering of each filter energy storage capacitor.

[0015] The present invention has an independent two-way unit input, which is connected to the fast fuse 17 through an input cable 6. A cable sheath 24 is installed at the through hole of the main shell 4, and the cable is shaped and limited by a cable support 10 inside; the through-wall terminal 11 is installed at the front upper part of the main shell 4, and the two H-bridge outputs are connected in series through cables, and the output at the other end of the H-bridge module is connected through cables; the bottom of the rear end of the main shell 4 is an inverted "X"-shaped opening, which is convenient for installation and positioning of the whole machine; a left side plate 5 and a right side plate 7 are installed on the left and right sides of the main shell 4, which is convenient for installation and maintenance.

[0016] The control drive board 22 is installed on the upper part of the shielding board 23, and the shielding board 23 is installed in the upper right part of the shell and directly above the module adapter board 15, and drives and protects the two H bridges (i.e., two three-phase rectifier bridges + H bridge module 14) to work at the same time.

[0017] like Figure 4 As shown, two three-phase AC inputs each pass through a fast fuse 17 to supply power to a three-phase rectifier bridge + H-bridge module 14. After rectification by the internal three-phase rectifier bridge, energy storage filtering is performed through a capacitor 2 to provide energy for the H-bridge inverter output of the three-phase rectifier bridge + H-bridge module 14. The two H-bridge inverter outputs are connected in series through internal cables and then output through a through-wall terminal 11.

[0018] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An integrated dual H-bridge power unit module, comprising a main housing (4), characterized in that: A capacitor fixing plate (1), a filter energy storage capacitor (2), a capacitor parallel PCB board (3), a left side plate (5), an input cable (6), a right side plate (7), an output cable (8), a main circuit internal cable (9), a cable support (10), a through-wall terminal (11), a heat sink (12), an adapter plate support column (13), a three-phase rectifier bridge + H-bridge module (14), a module adapter plate (15), a bypass power relay (16), a fast fuse (17), an absorption capacitor (18), a connecting row (19), a current terminal (20), a control terminal (21), a control drive board (22), a shielding plate (23) and a cable sheath (24) are installed on the main housing (4). The radiator (12) is installed in the upper middle part of the main housing (4), and two three-phase rectifier bridges + H-bridge modules (14) are installed in the radiator (12) to form a double H-bridge loop to achieve double-module series output; A module adapter plate (15) is fixed to each three-phase rectifier bridge + H-bridge module (14), and an adapter plate support column (13) is provided on one side of the module adapter plate (15). The module adapter plate (15) is fixedly connected to the main housing (4) and the heat sink (12) via the adapter plate support column (13), which is beneficial to improving the strength of the module adapter plate (15) and ensuring that the connection terminals are tightly connected; A bypass power relay (16), a fast fuse (17), a current terminal (20) and a control terminal (21) are installed on the module adapter board (15); the bypass power relay (16) is installed at the front end of the module adapter board (15) to meet the bypass output in the event of a fault; the control terminal (21) is installed in the module adapter board (15), and the main circuit current terminal (20) is fixed around the control terminal (21), which is conducive to reducing the interference of the main circuit on the drive control circuit; A capacitor fixing plate (1) is provided at the bottom of the main housing (4), and a filter energy storage capacitor (2) is mounted on the capacitor fixing plate (1); The filtering energy storage capacitor (2) is divided into two groups, which respectively provide energy storage and filtering for the corresponding three-phase rectifier bridge + H bridge module (14); Each group of filtering energy storage capacitors (2) is connected in parallel via a capacitor parallel PCB board (3); the positive and negative current terminals (20) of the rectifier bridge of the module adapter board (15) are connected to one end of the capacitor parallel PCB board (3) via a main circuit internal cable (9) or a copper bar; the H-bridge input current terminal (20) of the module adapter board (15) is connected to the other end of the capacitor parallel PCB board (3) via a connecting bar (19); and at the same time, the H-bridge input current terminal (20) of the module adapter board (15) is installed with an absorption capacitor (18), which is conducive to fully utilizing the energy storage and filtering of each filtering energy storage capacitor.

2. An integrated dual H-bridge power unit module as claimed in claim 1, characterized in that: The unit module is provided with two independent unit inputs, which are respectively connected to the fast fuse (17) through input cables (6); The through-wall terminal (11) is installed on the upper front part of the main housing (4), the two H-bridge outputs are connected in series via cables, and the output at the other end of the H-bridge module is connected via an output cable (8).

3. An integrated dual H-bridge power unit module as claimed in claim 1, characterized in that: The rear end bottom of the main housing (4) is an inverted "X"-shaped opening, which is convenient for installation and positioning of the whole machine; a cable sheath (24) is installed at the through hole of the main housing (4), and the cable is shaped and limited by a cable support member (10) inside; and a left side plate (5) and a right side plate (7) are installed on the left and right sides of the main housing (4), respectively.

4. The integrated dual H-bridge power unit module according to claim 1, characterized in that: The shielding plate (23) is installed at the upper right corner of the main housing and directly above the module adapter plate (15), and simultaneously drives and protects the operation of the two H bridges; the control drive plate (22) is installed on the upper part of the shielding plate (23).

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