Full-digital vehicle-mounted inverter

Abstract

The utility model discloses a full-digital vehicle-mounted inverter, which comprises a shell, the bottom plate is arranged in the shell body; the power board is installed on the bottom board, and the power board is used for converting direct current into alternating current; the sampling board is installed on the power board and electrically connected with the power board, and the sampling board is used for collecting voltage and current parameters of the power board; the control board is mounted on the power board, and the control board is electrically connected with the sampling board and the power board respectively; the inductance filtering assembly is installed on the bottom plate, and the inductance filtering assembly is electrically connected with the power board; and the resonant cavity assembly is installed on the bottom plate, and the resonant cavity assembly is electrically connected with the inductance filtering assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of inverters, and particularly relates to a fully digital vehicle-mounted inverter. Background Art

[0002] A fully digital vehicle-mounted inverter, also known as a power converter or Power Inverter, is an electronic device that can convert the DC12V (or 24V) direct current provided by an automobile battery into AC220V alternating current identical to that of the mains power. This converter has a wide range of applications in the field of vehicle power supplies, providing great convenience for motorists.

[0003] Existing vehicle-mounted inverters require external forced air cooling for heat dissipation and cannot be applied to military use environments. In addition, the output voltage quality of existing vehicle-mounted inverters is generally average, and the dynamic response is slow, making them unable to adapt to impact loads and short circuits. Summary of the Utility Model

[0004] The utility model provides a fully digital vehicle-mounted inverter to solve the above technical problems.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A fully digital vehicle-mounted inverter includes: a housing; a bottom plate installed in the housing; a power board installed on the bottom plate, which is used to convert direct current into alternating current; a sampling board installed on the power board and electrically connected to the power board, which is used to collect the voltage and current parameters of the power board; a control board installed on the power board, which is electrically connected to the sampling board and the power board respectively; an inductance filtering component installed on the bottom plate, which is electrically connected to the power board; and a resonant cavity component installed on the bottom plate, which is electrically connected to the inductance filtering component. The beneficial effects of the utility model are:

[0007] The power board includes: an isolation boost circuit, the input end of which is connected to a power supply device to convert low-voltage direct current into high-voltage direct current; and an H-bridge inverter circuit, the input end of which is electrically connected to the output end of the isolation boost circuit to convert high-voltage direct current into alternating current.

[0008] The isolation boost circuit includes a high-frequency transformer, the primary side of which is connected to a power supply device, and the secondary side of which is connected to the input end of the H-bridge inverter circuit.

[0009] The control board uses a DSP processor.

[0010] The resonant cavity assembly includes a hollow metal cavity 1, which is installed on the bottom plate. An inductor Lr and a transformer T are installed inside the hollow metal cavity 1. A heat dissipation silica gel 1 is filled between the inductor Lr, the transformer T and the hollow metal cavity 1. The heat generated during the operation of the inductor Lr and the transformer T is transferred to the bottom plate through the heat dissipation silica gel 1.

[0011] The inductance filtering assembly includes a hollow metal cavity 2, which is installed on the bottom plate. A differential mode inductor L is installed inside the hollow metal cavity 2. A heat dissipation silica gel 2 is filled between the differential mode inductor L and the hollow metal cavity 2. The heat generated by the differential mode inductor L is transferred to the bottom plate through the heat dissipation silica gel 2.

[0012] The all-digital vehicle-mounted inverter of the present utility model adopts natural cooling, without external forced air cooling. The generated heat losses are all transferred to the bottom plate, improving the reliability and service life of the all-digital vehicle-mounted inverter.

[0013] The main topology structure of the all-digital vehicle-mounted inverter adopts two-stage conversion. The front stage adopts a resonant isolation boost circuit, and the output adopts an H-bridge inverter circuit. High-frequency transformer isolation is adopted to achieve efficient conversion from low-voltage DC to industrial-frequency AC. Both two-stage conversions are controlled based on a DSP processor, with high output voltage quality and fast dynamic response, and can adapt to impact loads and short circuits. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall structure of the all-digital vehicle-mounted inverter according to an embodiment of the present utility model;

[0015] Figure 2 It is a schematic diagram of the internal structure of the all-digital vehicle-mounted inverter according to an embodiment of the present utility model;

[0016] Figure 3 It is a connection block diagram of the all-digital vehicle-mounted inverter according to an embodiment of the present utility model.

[0017] Description of the Reference Numerals:

[0018] 1 - housing; 2 - bottom plate; 3 - power board; 4 - sampling board; 5 - control board; 6 - hollow metal cavity 1; 7 - transformer T; 8 - inductor Lr; 9 - hollow metal cavity 2; 10 - differential mode inductor L. Detailed Embodiment

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0020] As Figures 1 - 3 shown, a fully digital vehicle-mounted inverter in an embodiment of the present utility model is mainly used for an inverter in a military vehicle, and may include a housing 1, a bottom plate 2, a power board 3, a sampling board 4, a control board 5, an inductance filtering component, and a resonant cavity component. Among them, the bottom plate 2 is installed in the housing 1; the power board 3 is installed on the bottom plate 2, and the power board 3 is used to convert direct current into alternating current; the sampling board 4 is installed on the power board 3 and is electrically connected to the power board 3, and the sampling board is used to collect the voltage and current parameters of the power board 3; the control board 5 is installed on the power board 3, and the control board 5 is electrically connected to the sampling board 4 and the power board 3 respectively, and the control board 5 may use a DSP processor; the inductance filtering component is installed on the bottom plate 2, and the inductance filtering component is electrically connected to the power board 3; the resonant cavity component is installed on the bottom plate 2, and the resonant cavity component is electrically connected to the inductance filtering component.

[0021] In an embodiment of the present utility model, the power board 3 may include an isolation boost circuit and an H-bridge inverter circuit. Among them, the input end of the isolation boost circuit is connected to a DC power supply device, and the low-voltage direct current is converted into high-voltage direct current; the input end of the H-bridge inverter circuit is electrically connected to the output end of the isolation boost circuit, and the high-voltage direct current is converted into alternating current.

[0022] In an embodiment of the present utility model, the isolation boost circuit includes a high-frequency transformer. The primary side of the high-frequency transformer is connected to a power supply device, and the secondary side of the high-frequency transformer is connected to the input end of the H-bridge inverter circuit. The isolation boost circuit uses a high-frequency transformer to achieve voltage boost and electrical isolation, boosts the input voltage to a higher voltage level, and then isolates the boosted voltage from the original input voltage through isolation components such as the high-frequency transformer to ensure that the output end is not affected by the electrical characteristics of the input end.

[0023] The H-bridge inverter circuit consists of four switching devices (such as MOSFETs, IGBTs, etc.), which are arranged in an H-shaped layout. Among them, the four switching devices are pairwise opposite, respectively controlling the forward and reverse flow of current. The input voltage of the H-bridge inverter circuit is a DC voltage. As needed, by controlling the on and off of the switching tubes, the direction of the current in the upper bridge arm can be changed. When two switching tubes are turned on simultaneously, the current flows from the positive pole to the negative pole; when two switching tubes are turned off simultaneously, the current remains unchanged. Through appropriate switching control, the current can be periodically switched between different directions. The lower bridge arm consists of another two switching tubes. Through a control method similar to that of the upper bridge arm, the current is made to flow from the negative pole to the positive pole. Through different control strategies, the switching operations of the lower bridge arm correspond to those of the upper bridge arm to generate the desired AC output voltage.

[0024] In an embodiment of the present utility model, the resonant cavity assembly may include a hollow metal cavity 6, the hollow metal cavity 6 is installed on the bottom plate 2, an inductor Lr7 and a transformer T8 are installed inside the hollow metal cavity 6, and heat dissipation silica gel 1 is filled between the inductor Lr7, the transformer T8 and the hollow metal cavity 6. The heat generated during the operation of the inductor Lr7 and the transformer T8 is transferred to the bottom plate 2 through the heat dissipation silica gel 1.

[0025] The inductive filtering assembly includes a hollow metal cavity 9, the hollow metal cavity 9 is installed on the bottom plate 2, a common-mode choke L10 is installed inside the hollow metal cavity 9, and heat dissipation silica gel 2 is filled between the common-mode choke L10 and the hollow metal cavity 9. The heat generated by the common-mode choke L10 is transferred to the bottom plate 2 through the heat dissipation silica gel 2.

[0026] The all-digital vehicle-mounted inverter of the present utility model adopts natural cooling and does not require external forced air cooling. The heat losses generated by all power devices, magnetic devices, etc. are transferred to the bottom plate 2, improving the reliability and service life of the all-digital vehicle-mounted inverter.

[0027] Typical applications of the all-digital vehicle-mounted inverter of the present utility model: AC conversion for military vehicles, military EPS, etc.

[0028] The implementation standards of the all-digital vehicle-mounted inverter of the present utility model are as follows:

[0029] GJB150A-2009 "Environmental Test Methods for Military Equipment"

[0030] GJB3836-1999 "General Specification for Vehicle-mounted Voltage Stabilizing Power Supplies"

[0031] GJB151B-2013 "Requirements and Measurements for Electromagnetic Emission and Susceptibility of Military Equipment and Subsystems" The main technical parameters of the all-digital vehicle-mounted inverter of the present utility model are as follows:

[0032]

[0033]

[0034] According to the all-digital vehicle-mounted inverter of the embodiments of the present utility model, the main topological structure adopts two-stage conversion. The front stage adopts a resonant isolation boost circuit, and the output adopts an H-bridge inverter circuit. High-frequency transformer isolation is adopted to achieve efficient conversion from low-voltage DC to industrial-frequency AC. Both stages of conversion are controlled based on a DSP processor, with high output voltage quality and fast dynamic response, and can adapt to impact loads and short circuits.

[0035] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0036] The above-described embodiments only represent several implementation manners of the present utility model, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, various modifications and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model should be subject to the appended claims.

Claims

1. A fully digital vehicle-mounted inverter, characterized in that, Comprising: A housing; A bottom plate, which is installed inside the housing; A power board, which is installed on the bottom plate and is used to convert direct current into alternating current; A sampling board, which is installed on the power board and is electrically connected to the power board. The sampling board is used to collect the voltage and current parameters of the power board; A control board, which is installed on the power board and is electrically connected to the sampling board and the power board respectively; An inductance filtering component, which is installed on the bottom plate and is electrically connected to the power board; A resonant cavity component, which is installed on the bottom plate and is electrically connected to the inductance filtering component.

2. The all-digital vehicle-mounted inverter according to claim 1, wherein The power board includes: An isolation boost circuit, the input end of which is connected to a power supply device to convert low-voltage direct current into high-voltage direct current; An H-bridge inverter circuit, the input end of which is electrically connected to the output end of the isolation boost circuit to convert high-voltage direct current into alternating current.

3. The all-digital vehicle-mounted inverter according to claim 2, characterized in that, The isolation boost circuit includes a high-frequency transformer. The primary side of the high-frequency transformer is connected to a power supply device, and the secondary side of the high-frequency transformer is connected to the input end of the H-bridge inverter circuit.

4. The all-digital vehicle-mounted inverter according to claim 3, characterized in that, The control board uses a DSP processor.

5. The all-digital vehicle-mounted inverter according to claim 3, wherein The resonant cavity component includes a hollow metal cavity one, which is installed on the bottom plate. An inductor Lr and a transformer T are installed inside the hollow metal cavity one. Heat dissipation silica gel one is filled between the inductor Lr, the transformer T and the hollow metal cavity one. The heat generated during the operation of the inductor Lr and the transformer T is transferred to the bottom plate through the heat dissipation silica gel one.

6. The all-digital vehicle-mounted inverter according to claim 5, characterized in that, The inductance filtering component includes a hollow metal cavity two, which is installed on the bottom plate. A differential-mode inductor L is installed inside the hollow metal cavity two. Heat dissipation silica gel two is filled between the differential-mode inductor L and the hollow metal cavity two. The heat generated by the differential-mode inductor L is transferred to the bottom plate through the heat dissipation silica gel two.

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