High-voltage direct-current inversion combined filter

Abstract

The utility model relates to the technical field of filters, in particular to a high-voltage direct-current inversion combined filter. According to the filter, a 270V filtering module and a 28V filtering module are integrated through a shell, an LC pi-type network and an LC low-pass filtering structure are adopted respectively, and synchronous filtering of high-voltage direct current and low-voltage direct current is achieved. The 270V module suppresses low and medium frequency interference through series connection and parallel connection of a multi-stage inductor and a capacitor group, and the 28V module reduces high frequency noise through parallel connection of an inductor and multiple capacitors. The shell is made of light-weight 6061 aluminum materials and is filled with polyurethane to enhance the insulating strength, and the aviation socket and the gold-plated copper platform ensure high-reliability connection. According to the design, a direct-current filtering function is integrated, the space is saved by more than 50%, the insertion loss is remarkably superior to that of a traditional discrete filter in a wide frequency band, the GJB151B2013 standard is met, and the filter is suitable for efficient EMI suppression and stable power supply of aviation equipment.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technical field, concretely is a kind of high voltage direct current inverter combination filter. BACKGROUND

[0002] In aviation equipment, direct current and alternating current filter are often set separately, are connected in line respectively, this kind of separate setting mode not only occupies limited space, and also more time-consuming to install, for this problem, urgently needed a kind of filter that can integrate direct current and alternating current capacity. SUMMARY

[0003] The problem to be solved is to provide a filter that can integrate direct current and alternating current capacity.

[0004] To achieve the above object, the utility model provides the following technical scheme: a kind of high voltage direct current inverter combination filter, including shell, 270V filter module and 28V filter module are integrated in the shell inside;

[0005] The 270V filter module includes input positive terminal and input negative terminal, forms multi-stage LC π type filter network by inductance L1, inductance L2 series connection, and parallel resistance R, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9 constitute high-frequency noise filter path;

[0006] The 28V filter module includes input positive terminal and ground terminal, inductance L4 is connected to output terminal in series, and is connected with parallel capacitor C 10 , capacitor C 11 , capacitor C 12 , capacitor C 13 , capacitor C 14 To constitute LC low-pass filter network together;

[0007] The shell is equipped with aviation socket, output soft lead wire and output gold-plated copper platform, for connecting external power supply and load equipment.

[0008] Preferably, the component parameters of the 270V filter module are: inductance L1 is 0.8mH, inductance L2 is 5μH, inductance L3 is 15μH;Capacitor C1, capacitor C2 are 30μF, capacitor C3, capacitor C4, capacitor C7, capacitor C8, capacitor C9 are 1μF, capacitor C5, capacitor C6 are 0.47μF;Resistance R is 1MΩ, is connected in power supply loop for surge current limitation.

[0009] Preferably, the component parameters of the 28V filter module are: inductance L4 is 10mH;Capacitor C 10 , capacitor C 11 , capacitor C 12 , capacitor C13 , capacitor C 14 are 2uF, and are connected in parallel between the output end and the ground end.

[0010] Preferably, the shell material is 6061 aluminum, the outer surface is treated with conductive oxidation, the internal flow guide part uses purple copper enameled wire, the components and the shell are isolated and insulated by a polytetrafluoroethylene film, and a polyurethane potting process is used for fixation.

[0011] Preferably, the filter satisfies the following performance parameters: rated voltage: 270V and 28V DC, rated current 100A; insertion loss in the 0.01MHz to 10MHz frequency band, the common mode and differential mode loss of the 270V filter module and the 28V filter module are not less than 5dB and 8dB, 12dB and 20dB respectively; operating temperature range: 55℃ to +85℃.

[0012] Compared with the prior art, the high-voltage direct-current inverter combined filter has the following beneficial effects: the utility model can replace the original high-voltage (270V) and low-voltage (28V) direct-current filter for installation and use respectively, integrates the 270V filter module and the 28V filter module in the same shell, occupies 30% less space than before, and the staff only needs to complete the connection in turn during installation, without completing the connection of two devices. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a 270V filter module principle diagram of the utility model;

[0014] Figure 2 is a 28V filter module principle diagram of the utility model;

[0015] Figure 3 is an appearance diagram of the utility model product;

[0016] Marked with a figure: 1, the shell; 2, the aviation socket; 3, the output soft lead; 4, the output gold-plated copper platform. DETAILED DESCRIPTION

[0017] The technical scheme in the embodiments of the utility model will be described below in combination with the drawings in the embodiments of the utility model:

[0018] As shown in the figure, the utility model high-voltage direct-current inverter combined filter includes a shell 1, the shell 1 is provided with a 270V filter module and a 28V filter module, the 270V filter module and the 28V filter module do not interfere with each other, the shell 1 is provided with an aviation socket 2, an output soft lead 3 and an output gold-plated copper platform 4, which are used to connect external power supply and load equipment.

[0019] As Figure 1The following is the circuit diagram of the 270V filter module of this utility model:

[0020] The positive input terminal is marked as ground (270V+) and forms a multi-stage filter through inductors L1 and L2 connected in series. The negative input terminal is marked as 270V and is directly grounded or used as a common reference point. The capacitor network filter structure consists of capacitors C1, C2, C3, C4, C5, C6, C7, C8, and C9 connected in parallel between the positive (270V+) and negative (270V) terminals of the power supply, forming a high-frequency noise filtering path. Inductors L1 and L2 are connected in series in the positive input path, forming an LCπ-type filter network with the parallel capacitors to suppress mid-to-low frequency interference. A resistor R is connected in series in the power supply circuit, possibly used to limit inrush current or adjust filter characteristics. Thermal batteries 1+ and 2+ are connected in parallel to the positive terminal of the power supply (270V+) as a backup or auxiliary power source.

[0021] Input: External power is connected through the input port and filtered by the inductor network L1, L2 and capacitor network;

[0022] Output: The filtered and stable voltage is output from the output port and supplied to the load device.

[0023] The values ​​of each component in the 270V filter module are as follows: L1: 0.8mH, L2: 5μH, L3: 15μH, C1: 30μF, C2: 30μF, C3: 1μF, C4: 1μF, C5: 0.47μF, C6: 0.47μF, C7: 1μF, C8: 1μF, C9: 1μF, and R is 1MΩ.

[0024] like Figure 2 The diagram shown is the electrical schematic of the 28V filter module of this utility model: the positive input terminal is marked as 28V+, and is connected in series to the output terminal through inductor L4 to form the main filter path; the negative input terminal is marked as 28VGND, which is directly used as the common ground reference point.

[0025] Inductor L4 is connected in series between the positive input terminal (28V+) and the output terminal to suppress the transmission of high-frequency noise.

[0026] Capacitor C 10 Capacitor C 11 Capacitor C 12 Connected in parallel between the output terminal and the ground terminal (28VGND), it forms a low-pass filter network to filter out high-frequency interference; capacitor C 13 It may serve as a decoupling capacitor at the input terminal, connected in parallel between the positive input terminal (28V+) and the ground terminal (28VGND) to absorb transient noise on the input side.

[0027] External power is connected from the input port, passing through inductor L4 and capacitor C. 13A preliminary filter is performed; the filtered stable voltage is led out from the output port and passes through the parallel capacitor C 10 , capacitor C 11 , capacitor C 12 Further smooth the voltage ripple. Inductor L4 and parallel capacitor group (capacitor C 10 ~ capacitor C 13 ) together constitute LC low-pass filter, inhibit high-frequency noise (such as switching noise, EMI interference) in the power supply; multiple capacitors in parallel design (capacitor C 10 ~ capacitor C 12 ) can reduce the equivalent series resistance (ESR), improve high-frequency filtering performance, while providing more stable output current; C 13 As an input decoupling capacitor, it can reduce the impact of transient fluctuations in the input voltage on subsequent circuits.

[0028] The values of various components in the 28V filter module are as follows:

[0029] L4: 10mH, C 10 : 2uF, C 11 : 2uF, C 12 : 2uF, C 13 : 2uF, C 14 : 2uF.

[0030] The filter product technical parameters of the utility model are as follows:

[0031] 1. Rated voltage, rated current requirements:

[0032] Rated voltage: DC 270V, 28VDC, rated current: 100A;

[0033] 2. Dielectric withstand voltage (5s);

[0034] 270V: line-line: 675VDC, line-ground: 800VDC, no breakdown, flying arc phenomenon;

[0035] 28V: line-line: 150VDC, line-ground: 150VDC, no breakdown, flying arc phenomenon;

[0036] 3. Insulation resistance (60s);

[0037] 270V: line-ground: ≥100MΩ, test voltage: 500VDC;

[0038] 28V: line-ground: ≥100MΩ, test voltage: 100VDC;

[0039] 4. Insertion loss: (in a 50Ω system, without load);

[0040] The minimum insertion loss of the power filter is shown in Table 1:

[0041] Table 1 Minimum insertion loss

[0042]

[0043] 5. Temperature range: 55℃ to +85℃.

[0044] The utility model discloses a filter is installed in the direct current power supply input end of equipment, and the filter has 270VDC, 28V power filter function, is used for carrying out EMI filtering to equipment direct current 270V and 28V power supply, and the whole machine satisfies the relevant requirements of GJB151B2013. The shell 1 material uses 6061 aluminum, improves the reliability of product, reduces the weight of product, the outer surface of shell 1 is treated through electrically conductive oxidation, enhances the electrically conductive performance of product shell surface, enhances the "three proofing " performance of shell surface, the inside flow guide part of filter is the enameled wire, and the enameled wire material is red copper, and the red copper direct current resistance is small and has weldability, the protection between the inside component and the shell 1 of filter is 0.2mm polytetrafluoroethylene film, and the component and shell 1 inner wall are completely isolated and insulated protection, the fixing of component adopts the process of pouring polyurethane, improves the electric strength of product, and the polyurethane pouring is carried out high-temperature vacuumizing, and the electric strength of pouring material is enhanced.

[0045] The utility model discloses a filter is installed in the direct current power supply input end of equipment, and the filter has 270VDC, 28V power filter function, is used for carrying out EMI filtering to equipment direct current 270V and 28V power supply, and the whole machine satisfies the relevant requirements of GJB151B2013. The shell 1 material uses 6061 aluminum, improves the reliability of product, reduces the weight of product, the outer surface of shell 1 is treated through electrically conductive oxidation, enhances the electrically conductive performance of product shell surface, enhances the "three proofing " performance of shell surface, the inside flow guide part of filter is the enameled wire, and the enameled wire material is red copper, and the red copper direct current resistance is small and has weldability, the protection between the inside component and the shell 1 of filter is 0.2mm polytetrafluoroethylene film, and the component and shell 1 inner wall are completely isolated and insulated protection, the fixing of component adopts the process of pouring polyurethane, improves the electric strength of product, and the polyurethane pouring is carried out high-temperature vacuumizing, and the electric strength of pouring material is enhanced.

[0046] The above embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative work belong to the scope of protection of the utility model.

Claims

1. A high voltage direct current inverter combination filter, characterized by, The shell (1) is internally integrated with a 270V filter module and a 28V filter module; The 270V filter module comprises an input positive terminal and an input negative terminal, a multi-stage LCπ type filter network is formed by connecting in series the inductor L1 and the inductor L2, and a high-frequency noise filter path is formed by connecting in parallel the resistor R, the capacitors C1, C2, C3, C4, C5, C6, C7, C8 and C9. The 28V filter module includes an input positive terminal and a ground terminal, and is connected to an output terminal in series through an inductor L4 and is connected in parallel with a capacitor C 10 , a capacitor C 11 , a capacitor C 12 , a capacitor C 13 , a capacitor C 14 together constitute an LC low-pass filter network; The shell (1) is provided with an aviation socket (2), an output soft lead (3) and an output gold-plated copper platform (4) for connecting an external power supply and a load device.

2. The high voltage DC inverter combination filter of claim 1, wherein, The component parameters of the 270V filter module are as follows: the inductor L1 is 0.8mH, the inductor L2 is 5μH, the inductor L3 is 15μH; the capacitors C1 and C2 are 30μF, the capacitors C3, C4, C7, C8 and C9 are 1μF, the capacitors C5 and C6 are 0.47μF; the resistor R is 1MΩ and is connected in series in a power supply circuit for surge current limitation.

3. The high voltage DC inverter combination filter of claim 1, wherein, The component parameters of the 28V filter module are: inductance L4 is 10 mH; capacitance C 10 , capacitance C 11 , capacitance C 12 , capacitance C 13 , capacitance C 14 are all 2 μF, connected in parallel between the output end and the ground end.

4. The high voltage DC inverter combination filter of claim 1, wherein, The shell (1) is made of 6061 aluminum, the outer surface is subjected to conductive oxidation treatment, the internal conductive part is made of purple copper enameled wire, the components and the shell (1) are insulated by a polytetrafluoroethylene film, and a polyurethane potting process is used for fixation.

5. The high voltage DC inverter combination filter of claim 1, wherein, The filter satisfies the following performance parameters: rated voltage: DC 270V and 28V, rated current 100A; insertion loss in the frequency band of 0.01MHz to 10MHz, common mode and differential mode loss of the 270V filter module and the 28V filter module are not less than 5dB and 8dB, 12dB and 20dB respectively; working temperature range: 55℃ to +85℃.

Images