CN215498728U - Filter for broadband power supply facility - Google Patents

Abstract

The utility model belongs to the technical field of filters, and particularly relates to a filter for a broadband power facility, which comprises: a four-way low-pass filter circuit; the four-path low-pass filter circuit is suitable for being respectively connected into three-phase four lines of a 200-800 Hz broadband power supply so as to inhibit 10 kHz-18 GHz conducted interference generated by the 200-800 Hz broadband power supply; according to the utility model, the four-way low-pass filter circuit is connected into the three-phase four-wire of the 200-800 Hz broadband power supply, so that 10 kHz-18 GHz conducted interference generated by the 200-800 Hz broadband power supply can be inhibited, and the filter for broadband power supply installation has good inhibition performance in the whole frequency range of 10 kHz-18 GHz.

Description

Filter for broadband power supply facility

Technical Field

The utility model belongs to the technical field of filters, and particularly relates to a filter for a broadband power supply facility.

Background

The 200-800 Hz broadband power supply is directly transmitted to equipment to have interference signals, so that the equipment interference harm is caused, the service life is influenced, and the use cost is increased.

Therefore, it is desirable to develop a new filter for broadband power facilities to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a filter for broadband power supply facilities, which aims to solve the problem of how to inhibit a 200-800 Hz broadband power supply from generating 10 kHz-18 GHz conducted interference.

In order to solve the above technical problem, the present invention provides a filter for a broadband power facility, comprising: a four-way low-pass filter circuit; the four-path low-pass filter circuit is suitable for being respectively connected into three-phase four lines of a 200-800 Hz broadband power supply so as to inhibit 10 kHz-18 GHz conducted interference generated by the 200-800 Hz broadband power supply.

Further, the circuit structure of each low-pass filter circuit in the four low-pass filter circuits is the same, and one of the low-pass filter circuits includes: the broadband 200-800 Hz power supply sequentially passes through the first feedthrough capacitor, the first common mode capacitor, the first differential mode inductor, the second common mode capacitor, the second common mode inductor, the second differential mode inductor, the third common mode capacitor, the third differential mode inductor, the fourth common mode capacitor and the second feedthrough capacitor, and then 10 kHz-18 GHz conduction interference is filtered out, so that the power supply signal is transmitted to a corresponding load.

Further, the first differential mode inductor, the second differential mode inductor and the third differential mode inductor are suitable for adopting 40 mu H differential mode inductors; the first feedthrough capacitor and the second feedthrough capacitor are suitable for adopting 0.022 mu F feedthrough capacitors; the first common-mode capacitor and the fourth common-mode capacitor are suitable for adopting 40 mu F common-mode capacitors; the second common-mode capacitor and the third common-mode capacitor are suitable for adopting a 60 muF common-mode capacitor.

Furthermore, the four-way low-pass filter circuit is located inside the shell, the shell is made of a steel plate, and the surface of the shell is plated with tin.

Furthermore, three bays are arranged in the shell, the input end and the output end of each low-pass filter circuit are respectively positioned in two separated bays, and the four low-pass filter circuits are positioned in the middle bays, namely, each low-pass filter circuit is connected with the input end and the output end through corresponding feedthrough capacitors.

Furthermore, the input end and the output end are led out of the shell through the corresponding waveguide screws.

The four-way low-pass filter circuit has the advantages that the four-way low-pass filter circuit is connected into the three-phase four-wire of the 200-800 Hz broadband power supply, so that 10 kHz-18 GHz conducted interference generated by the 200-800 Hz broadband power supply can be inhibited, and the filter for broadband power supply installation has good inhibition performance in the whole frequency range of 10 kHz-18 GHz.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a circuit diagram of a filter for a wide frequency power utility of the present invention;

FIG. 2 is a block diagram of a filter for a wide frequency power supply facility according to the present invention;

FIG. 3 is a schematic block diagram of a filter for broadband power utility according to the present invention prior to insertion;

fig. 4 is a functional block diagram of the filter for broadband power supply facilities according to the present invention after insertion.

In the figure:

a housing 1.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

Fig. 1 is a circuit diagram of a filter for a wide-band power supply facility according to the present invention.

In this embodiment, as shown in fig. 1, the present embodiment provides a filter for broadband power facilities, which includes: a four-way low-pass filter circuit; the four-path low-pass filter circuit is suitable for being respectively connected into three-phase four lines of a 200-800 Hz broadband power supply so as to inhibit 10 kHz-18 GHz conducted interference generated by the 200-800 Hz broadband power supply.

In the embodiment, the four-way low-pass filter circuit is connected to the three-phase four-wire of the 200-800 Hz broadband power supply, so that the 10 kHz-18 GHz conducted interference generated by the 200-800 Hz broadband power supply can be suppressed, and the filter for broadband power supply installation has good suppression performance in the whole frequency band of 10 kHz-18 GHz.

In this embodiment, the four low-pass filter circuits have the same circuit structure, and one of the four low-pass filter circuits includes: the 200-800 Hz broadband power supply sequentially passes through a first feedthrough capacitor C5, a first common mode capacitor C1, a first differential mode inductor L1, a second common mode capacitor C2, a second differential mode inductor L2, a third common mode capacitor C3, a third differential mode inductor L3, a fourth common mode capacitor C4 and a second feedthrough capacitor C6, and then conductive interference of 10 kHz-18 GHz is filtered out, so that the power supply signal is transmitted to a corresponding load.

In this embodiment, as shown in fig. 1, the input terminals of the four low-pass filter circuits are respectively an a terminal, a B terminal, a C terminal, and an N terminal, and the output terminals of the four low-pass filter circuits are respectively an a 'terminal, a B' terminal, a C 'terminal, and an N' terminal, so as to be connected to a three-phase four-wire of a 200-800 Hz broadband power supply.

In this embodiment, first feedthrough capacitor C5, second feedthrough capacitor C6 set up respectively at input, output, can realize filtering isolation, prevent the coupling of high frequency signal, guarantee the insertion loss performance of full frequency channel.

In the present embodiment, the first differential-mode inductor L1, the second differential-mode inductor L2, and the third differential-mode inductor L3 are adapted to adopt 40 μ H differential-mode inductors; the first feedthrough capacitor C5 and the second feedthrough capacitor C6 are suitable for adopting 0.022 μ F feedthrough capacitors; the first common-mode capacitor C1 and the fourth common-mode capacitor C4 are suitable for adopting 40 mu F common-mode capacitors; the second common-mode capacitor C2 and the third common-mode capacitor C3 are suitable for adopting a 60 muF common-mode capacitor.

Fig. 2 is a structural diagram of a filter for broadband power facilities according to the present invention.

In this embodiment, as shown in fig. 2, the four-way low-pass filter circuit is located inside the housing 1, the housing 1 is made of a steel plate, and the surface of the housing 1 is plated with tin, so that the housing has strong corrosion resistance.

In this embodiment, three bays are arranged inside the housing 1, the input end and the output end of each low-pass filter circuit are respectively located in two separated bays, and the four low-pass filter circuits are located in the middle bay, that is, each low-pass filter circuit is connected with the input end and the output end through a corresponding feedthrough capacitor, so as to ensure that each low-pass filter circuit has good suppression performance in the entire frequency band of 10kHz to 18 GHz.

In this embodiment, the input end and the output end are led out of the housing 1 through the corresponding waveguide screws, so that the installation is convenient, and the housing can be penetrated to completely shield, thereby ensuring the shielding performance of the product.

FIG. 3 is a schematic block diagram of a filter for broadband power utility according to the present invention prior to insertion;

fig. 4 is a functional block diagram of the filter for broadband power supply facilities according to the present invention after insertion.

In this embodiment, as shown in fig. 3 and 4, the attenuation characteristic of the filter for broadband power supply needs to be greater than 80dB at 10kHz, and the cutoff frequency thereof needs to be set to be less than f/2, i.e., less than 5 kHz. The filter for the broadband power supply facility can meet the requirement of full-band insertion loss through the four-path low-pass filter circuit, and meanwhile, the input and the output of the filter for the broadband power supply facility are filtered and isolated by adopting the two-stage feedthrough capacitor, so that the coupling of high-frequency signals is prevented, and the full-band insertion loss performance is ensured.

In the embodiment, the cut-off frequency of the equal fluctuation bandwidth is 1/(2 pi) Hz, and the characteristic impedance is 1 omega; l1 ═ L3 ═ 1.11151H in fig. 4; l2 ═ 1.17352H; c1 ═ C4 ═ 2.16656F; c2 ═ C3 ═ 3.09364F; according to the parameters of the reference filter, the cut-off frequency of the filter for the broadband power supply is 4kHz, and the characteristic impedance is 50 omega.

In the present embodiment, the cutoff frequency conversion is implemented by first obtaining a ratio M of the cut-off frequency of the undulating bandwidth such as the filter to be designed to the cut-off frequency of the undulating bandwidth such as the reference filter, and using this M to remove the component values of the reference filter.

In this embodiment, the characteristic impedance transformation is implemented by first obtaining a ratio K of the characteristic impedance of the filter to be designed to the characteristic impedance filter of the reference filter, multiplying K by each inductance component value of the filter obtained after the cutoff frequency transformation, and dividing each capacitance component value by K.

In the present embodiment, therefore, the cut-off frequency is 4kHz, and the M and K values of the chebyshev-type low-pass filter with a characteristic impedance of 50 Ω are as follows:

in this embodiment, the Insertion Loss (IL) of the filter is the ratio of the power delivered by the power supply to the load before and after the filter is inserted into the circuit, and may also be represented by the ratio of the port voltages V1 and V2 before and after the filter is inserted:

namely, when f is 10kHz, the insertion loss is 83.4dB, and the filter for the broadband power supply facility can meet the requirement that the insertion loss in the frequency range of 10 kHz-18 GHz is more than or equal to 80 dB.

In summary, the four-way low-pass filter circuit is connected to the three-phase four-wire of the 200-800 Hz broadband power supply, so that the 10 kHz-18 GHz conducted interference generated by the 200-800 Hz broadband power supply can be suppressed, and the filter for broadband power supply installation has good suppression performance in the whole frequency range of 10 kHz-18 GHz.

The components selected for use in the present application (components not illustrated for specific structures) are all common standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experimentation. Moreover, the software programs referred to in the present application are all prior art, and the present application does not relate to any improvement of the software programs.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations can be made by the worker in the light of the above teachings without departing from the spirit of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (5)

1. A filter for broadband power supply facilities, comprising:

a four-way low-pass filter circuit; wherein

The four-path low-pass filter circuit is suitable for being respectively connected into three-phase four lines of a 200-800 Hz broadband power supply so as to inhibit 10 kHz-18 GHz conducted interference generated by the 200-800 Hz broadband power supply;

each low-pass filter circuit in four ways low-pass filter circuit's circuit structure is the same, and wherein a way low-pass filter circuit includes: the first feedthrough capacitor, the first common mode capacitor, the first differential mode inductor, the second common mode capacitor, the second differential mode inductor, the third common mode capacitor, the third differential mode inductor, the fourth common mode capacitor and the second feedthrough capacitor are arranged in sequence, namely

The 200-800 Hz broadband power supply sequentially passes through a first feedthrough capacitor, a first common mode capacitor, a first differential mode inductor, a second common mode capacitor, a second differential mode inductor, a third common mode capacitor, a third differential mode inductor, a fourth common mode capacitor and a second feedthrough capacitor, and then 10 kHz-18 GHz conducted interference is filtered out, so that a power supply signal is transmitted to a corresponding load.

2. The filter for broadband power utility of claim 1,

the first differential mode inductor, the second differential mode inductor and the third differential mode inductor are suitable for adopting 40 mu H differential mode inductors;

the first feedthrough capacitor and the second feedthrough capacitor are suitable for adopting 0.022 mu F feedthrough capacitors;

the first common-mode capacitor and the fourth common-mode capacitor are suitable for adopting 40 mu F common-mode capacitors;

the second common-mode capacitor and the third common-mode capacitor are suitable for adopting a 60 muF common-mode capacitor.

3. The filter for broadband power utility of claim 1,

the four-way low-pass filter circuit is located inside the shell, the shell is made of steel plates, and the surface of the shell is plated with tin.

4. The filter for broadband power utility of claim 3,

three bays are arranged in the shell, the input end and the output end of each low-pass filter circuit are respectively positioned in two separated bays, and the four low-pass filter circuits are positioned in the middle bay, namely

Each low-pass filter circuit is connected with the input end and the output end through corresponding feedthrough capacitors.

5. The filter for broadband power utility of claim 4,

the input end and the output end are led out of the shell through the corresponding waveguide screws.

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