Emergency ventilation inverter with standard host structure

Abstract

The utility model discloses an emergency ventilation inverter with a standard host structure, which belongs to the technical field of rail train electrical engineering and comprises a box body and radiating fins. Cooling fins are arranged on the top face outside the box body, a main board is arranged at the top end inside the box body, and an alternating-current filter inductor, a direct-current boost inductor, a direct-current filter plate and an alternating-current filter plate are arranged on the side face inside the box body. The front stage of the AC filter board is integrated with an isolation contactor, and the rear stage of the AC filter board is provided with an RC filter circuit. The circuit board and the components are arranged by reasonably utilizing the space in the box body, the circuit board is highly integrated, and the structural light weight is realized; the device can be placed in an air-conditioning cabinet to realize hosting; wiring is easy, signal line interference is reduced, and maintenance and debugging are very convenient; according to the utility model, high-order harmonics are effectively filtered out, the output harmonic content is reduced from 2.2% to 1.8%, the AC filter board of the integrated isolation contactor is faster in isolation response to a front-stage circuit and a rear-stage circuit, and the protection capability to an inverter and a load is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway vehicle electrical engineering, and particularly relates to an emergency ventilation inverter with a standard mainframe structure. Background Art

[0002] The emergency ventilation inverter is used under emergency ventilation conditions. It is a backup power source that is urgently activated after the main power supply of the ventilator fails to ensure smooth ventilation in the carriage. The emergency ventilation inverter is powered by a battery and operates in a step-down and frequency-reducing manner. The working time can be adjusted according to requirements.

[0003] The existing emergency ventilation inverter box is installed under the vehicle, while the air-conditioning controller is installed on the vehicle. The distance between them is far, the wiring is difficult, the signal line interference is large, and the maintenance and debugging are very inconvenient. Because it is installed under the vehicle and needs to be waterproof, its volume is relatively large. The position of the heat sink faces the vehicle body, affecting the heat dissipation effect; the traditional circuit design makes the inverter large in volume and low in conversion efficiency, and there are problems such as electromagnetic interference.

[0004] Therefore, there is an urgent need for a new technical solution in the existing technology to solve this problem. Summary of the Utility Model

[0005] In order to overcome the deficiencies of the existing technology, the utility model provides an emergency ventilation inverter with a standard mainframe structure, which is used to solve the problems of large volume, low conversion efficiency, and electromagnetic interference of the inverter.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is: an emergency ventilation inverter with a standard mainframe structure, including a box body and a heat sink; the heat sink is arranged on the top surface outside the box body. Output connectors and input signal connectors are arranged on the side surface outside the box body, a main board is arranged at the top end inside the box body, and an AC filter inductor, a DC boost inductor, a DC filter board, and an AC filter board are arranged on the side surface inside the box body.

[0007] Preferably, an isolation contactor is integrated in the front stage of the AC filter board, and an RC filter circuit is arranged in the rear stage of the AC filter board.

[0008] Through the above design scheme, the utility model can bring the following beneficial effects:

[0009] 1. Reasonably utilize the space inside the box body to arrange the circuit board and components. The circuit board is highly integrated, realizing the light weight of the structure. The volume is reduced to half of the original;

[0010] 2. It can be placed in the air-conditioning cabinet to realize the mainframe function; the wiring is easy, the signal line interference is reduced, and the maintenance and debugging are very convenient;

[0011] 3. Through the low-pass filtering of the LC-RC two-stage link, high-order harmonics are effectively filtered out, and the output harmonic content is reduced from 2.2% to 1.8%. The AC filter board integrated with the isolation contactor has a faster isolation response to the front and rear stage circuits, improving the protection ability for the inverter and the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. 1 is a schematic external structure diagram of an emergency ventilation inverter with a standard host structure according to the present invention.

[0013] Figure 2 FIG. 2 is a schematic internal split diagram of an emergency ventilation inverter with a standard host structure according to the present invention.

[0014] Figure 3 FIG. 3 is a schematic wiring diagram of an emergency ventilation inverter with a standard host structure according to the present invention.

[0015] Figure 4 FIG. 4 is a schematic diagram of the principle of an emergency ventilation inverter with a standard host structure according to the present invention.

[0016] Figure 5 FIG. 5 is a circuit diagram of the AC filter board of an emergency ventilation inverter with a standard host structure according to the present invention.

[0017] In the figure, 1 - box body, 2 - heat sink, 3 - output connector, 4 - input signal connector, 5 - main board, 6 - AC filter inductor, 7 - DC boost inductor, 8 - DC filter board, 9 - AC filter board, 91 - isolation contactor, 92 - RC filter circuit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following is a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings.

[0019] It should be particularly noted that the terms "front and back, up and down, left and right" described in the text are only a simplified way of intuitively describing the positional relationship based on the drawings, and are not a limitation on the technical solution.

[0020] To more clearly illustrate the present invention, the following further describes the present invention with reference to the preferred embodiments. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive. Without departing from the inventive concept and scope set forth in the claims, the user can make various changes to the following parameters. To avoid confusing the essence of the present invention, well-known methods and processes are not described in detail.

[0021] From the attached Figures 1 to 5Shown: An emergency ventilation inverter with a standard host structure, including a box body 1 and a heat sink 2; the heat sink 2 is arranged on the outer top surface of the box body 1. An output connector 3 and an input signal connector 4 are arranged on the outer side surface of the box body 1, a main board 5 is arranged at the top end inside the box body 1, and an AC filter inductor 6, a DC boost inductor 7, a DC filter board 8 and an AC filter board 9 are arranged on the side surface inside the box body 1.

[0022] Furthermore, an isolation contactor 91 is integrated in the front stage of the AC filter board 9, and an RC filter circuit 92 is arranged in the rear stage of the AC filter board 9.

[0023] In specific implementation, first, a highly integrated circuit board is produced; then, the inverter control program is burned; finally, the electrical components are assembled.

[0024] The main circuit of the inverter consists of two parts: Boost boost and IGBT module inversion. The principle is that the Boost circuit boosts the DC110V DC voltage to a high voltage of several hundred volts, and the IGBT module inversion circuit inverses the several hundred volts DC voltage into AC380V / 50Hz. When the control box outputs a high level, the IGBT conducts, and at this time, the input voltage stores energy in the inductor. Since the input is direct current, the current on the inductor increases linearly at a certain rate. As the inductor current increases, some energy is stored in the inductor. When the control box outputs a low level, the IGBT turns off. Since the inductor current cannot change suddenly, the current flowing through the inductor does not immediately become 0, but slowly changes from the value when charging is completed to 0. And the original circuit has been disconnected, so the inductor can only discharge through the new circuit, that is, the inductor starts to charge the capacitor, and the voltage across the capacitor increases. The control box outputs six-way PWM waves to control the on and off of the 3 pairs of bridge arm UVW switching tubes, thereby converting the DC side voltage into three-phase sinusoidal alternating current. SVPWM - Space Vector PWM of Voltage mainly takes the ideal flux circle of the stator of a three-phase symmetrical motor when powered by three-phase symmetrical sinusoidal voltage as the reference standard, and makes appropriate switching of different switching modes of the three-phase inverter, thereby forming a PWM wave. Therefore, the actual flux vector formed tracks its accurate flux circle.

[0025] The AC filter board 9 has been improved on the original LC filter circuit. An isolation contactor 91 is integrated in the front stage, and a set of RC filter circuit 92 is added in the rear stage. Through the low-pass filtering of the LC - RC two links, high-order harmonics are effectively filtered, and the output harmonic content is reduced from 2.2% to 1.8%. The AC filter board 9 integrating the isolation contactor 91 has a faster isolation response for the front and rear stage circuits, improving the protection ability for the inverter and the load.

[0026] The emergency ventilation inverter of the present utility model is controlled by an advanced digital signal processor, the output is a sine wave, the harmonic content is small, it has perfect self-checking and self-protection functions, good electromagnetic compatibility, and high reliability.

[0027] Obviously, the embodiments described above are only a part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the scope of protection of the present utility model.

Claims

1. An emergency ventilation inverter with a standard host structure, characterized in that: It includes a box body (1) and a heat sink (2); a heat sink (2) is provided on the outer top surface of the box body (1), an output connector (3) and an input signal connector (4) are provided on the outer side surface of the box body (1), a main board (5) is provided at the top end inside the box body (1), and an AC filter inductor (6), a DC boost inductor (7), a DC filter board (8) and an AC filter board (9) are provided on the side surface inside the box body (1).

2. The emergency ventilation inverter with a standard host structure according to claim 1, characterized in that: The front stage of the AC filter board (9) integrates an isolation contactor (91), and an RC filter circuit (92) is provided at the rear stage of the AC filter board (9).

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