High-power filter suitable for low frequency

Abstract

The utility model relates to the technical field of electronic filters, in particular to a high-power filter suitable for low frequency, which comprises an input port, an output port and a filter circuit composed of a plurality of stages of LC resonant circuits. The filter circuit adopts specific inductance and capacitance elements to construct a multi-stage LC resonant circuit so as to accurately control the cut-off frequency, and a shell is made of high-performance plastic and is miniaturized through size optimization. The low-pass filter solves the problems of inaccurate cut-off frequency, large insertion loss, complex structure, large size and the like of the existing similar products, and can be widely applied to electronic equipment for communication, audio processing and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic filter technical field, concretely relates to a high power filter suitable for low frequency, mainly apply to the frequency screening filtration of signal, for example, use in the occasion such as communication system, audio processing equipment needs to filter out high frequency signal. BACKGROUND

[0002] In the prior art, low pass filter is widely used in various electronic devices to realize selective processing of signal frequency. However, the current common low pass filter has some deficiencies. On the one hand, the cutoff frequency of part of the low pass filter is not accurate enough, and in the actual use process, it is difficult to accurately filter out the high frequency signal higher than the set cutoff frequency, resulting in interference in signal output and affecting the accurate processing of the subsequent circuit to the signal. On the other hand, the insertion loss of many low pass filters is large, especially in the frequency band close to the cutoff frequency, the signal energy loss is obvious, which reduces the signal transmission efficiency of the whole system. In addition, the structure of some low pass filters is relatively complex, the manufacturing cost is high, which is not conducive to large-scale popularization and application, or the volume is large, which is difficult to adapt to the miniaturized electronic equipment with strict space requirements. SUMMARY

[0003] The utility model provides a high power filter suitable for low frequency, aims at solving the prior art low pass filter cutoff frequency is not accurate enough, insertion loss is big, structure is complex or volume is big and so on, realizes accurate high frequency signal filter, reduces insertion loss, simplifies structure and reduces the effect of volume, so that better satisfy the demand of different electronic equipment to low pass filter function.

[0004] In order to realize the utility model's purpose, the technical scheme adopted is: a high power filter suitable for low frequency, including input port, output port and filter circuit, the filter circuit includes the topology structure of multistage LC resonant circuit, the inductance element in each stage LC resonant circuit is composed of magnetic ring winding enameled wire, and the capacitance element is multilayer ceramic capacitor, one end of the inductance of the first stage LC resonant circuit is connected with the input port, the other end is connected with the capacitance in series and then grounded, the other end of the capacitance is connected with one end of the inductance of the next stage LC resonant circuit, and is connected to the output port after passing through multistage LC resonant circuit in sequence.

[0005] As the optimization scheme of the utility model, the multistage LC resonant loop includes first inductor L1, second inductor L2, third inductor L3, first capacitor C1, second capacitor C2, third capacitor C3, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, ninth capacitor C9, tenth capacitor C10, eleventh capacitor C11, twelfth capacitor C12 and thirteenth capacitor C13, one end of fourth capacitor C4, one end of fifth capacitor C5, one end of first capacitor C1 and one end of second inductor L2 are connected with input port, the other end of fourth capacitor C4 and the other end of fifth capacitor C5 are grounded, one end of second capacitor C2, one end of thirteenth capacitor C13 and one end of first inductor L1 are connected with the other end of first capacitor C1, the other end of second inductor L2 is connected with the other end of first capacitor C1, sixth capacitor C6, seventh capacitor C7 and eighth capacitor C8 are connected in parallel between the other end of first capacitor C1 and ground, one end of third inductor L3 and one end of third capacitor C3 are connected with the other end of second capacitor C2, the other end of first inductor L1 and the other end of thirteenth capacitor C13 are connected with the other end of second capacitor C2, ninth capacitor C9, tenth capacitor C10 and eleventh capacitor C11 are connected in parallel between the other end of second capacitor C2 and ground, the other end of third inductor L3, the other end of third capacitor C3 and one end of twelfth capacitor C12 are connected with output port, the other end of twelfth capacitor C12 is grounded.

[0006] As the optimization scheme of the utility model, the inductance of first magnetic ring inductor L1, second magnetic ring inductor L2 and third magnetic ring inductor L3 is 28uH, 20uH and 21uH respectively.

[0007] As the optimization scheme of the utility model, first capacitor C1, second capacitor C2 and third capacitor C3 are 1.5nF, 6.8nF and 4.7nF respectively, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7 and eighth capacitor C8 are 8.2nF, 390pF, 560pF, 5.6nF and 10nF respectively, ninth capacitor C9, tenth capacitor C10, eleventh capacitor C11, twelfth capacitor C12 and thirteenth capacitor C13 are 10nF, 3.9nF, 680pF, 5.6nF and 390pF respectively.

[0008] The utility model discloses a positive effect has: 1) the utility model discloses a multistage LC resonant circuit is adopted in combination with high accuracy inductance and capacitor element, can accurate setting and control cut-off frequency, make this low pass filter to the high frequency signal of higher cut-off frequency has outstanding filtering effect, effectively reduces the interference of signal output, improves the accuracy of signal processing, significantly reduces the insertion loss, ensures in the signal transmission process, especially in the cut-off frequency vicinity frequency band, can maximum limit signal energy, improves the signal transmission efficiency of entire electronic system.

[0009] 2) The utility model discloses filter circuit selects miniaturized element, high power inductance, high voltage capacitor, not only make filter structure more compact, simple, reduce the manufacturing cost, also realize the requirement of high -power scene use, widen its application scope. BRIEF DESCRIPTION OF DRAWINGS

[0010] The utility model will be described further in detail below combining with the specific embodiment and the drawing.

[0011] Figure 1 It is the circuit schematic diagram of the utility model embodiment. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical scheme and advantage of the patent embodiment more clear, the technical scheme in the patent embodiment will be clearly and completely described below combining with the drawing in the patent embodiment.

[0013] The following description of at least one example embodiment is merely illustrative in nature and is in no way intended to limit the application or its application or uses. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0014] It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the example embodiments according to the utility model.

[0015] Unless otherwise specified, the relative arrangement, numerical expression and numerical value of the components and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be clear that the size of each part shown in the drawing is not drawn in proportion for the convenience of description. The technology, method and equipment known to those skilled in the art may not be discussed in detail, and in all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other example values of the example embodiments can have different values.

[0016] As Figure 1The utility model discloses a high power filter suitable for low frequency, including input port, output port and filter circuit, filter circuit adopts the novel topology structure that is composed of multistage LC resonant circuit, wherein inductance element selects high -power magnetic core and enameled wire winding, and capacitor element adopts multilayer ceramic capacitor, and this capacitor has low equivalent series resistance (ESR) and high precision capacitance value characteristics. The inductance one end of first stage LC resonant circuit is connected input port, and the other end is connected after series connection with capacitor and ground, and the other end of capacitor is connected to the inductance one end of next stage LC resonant circuit simultaneously, and so on, and is connected to output port after multistage LC resonant circuit. The design of this multistage LC resonant circuit, through the parameter of reasonable allocation each stage inductance and capacitor, can more accurately determine the cut-off frequency, makes the filtration of high frequency signal more accurate. The low pass filter is composed of 3 inductance elements and 13 capacitor elements.

[0017] The inductance of the first magnetic ring inductor L1, the second magnetic ring inductor L2 and the third magnetic ring inductor L3 is 28uH, 20uH and 21uH respectively.

[0018] The first capacitor C1, the second capacitor C2 and the third capacitor C3 are 1.5nF, 6.8nF and 4.7nF respectively; the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 are 8.2nF, 390pF, 560pF, 5.6nF and 10nF respectively; the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12 and the thirteenth capacitor C13 are 10nF, 3.9nF, 680pF, 5.6nF and 390pF respectively.

[0019] The high power filter suitable for low frequency has simple elements, few components, and a high-performance plastic shell that is optimized in size to achieve miniaturization. The overall size is optimized to meet the installation and heat dissipation requirements of the filter circuit while achieving miniaturization, making it easy to use in small electronic devices.

[0020] As Figure 1As shown, first, according to the design requirements, select the appropriate specifications of high-power magnetic ring inductors and multilayer ceramic capacitors as the basic elements of the filter circuit. According to the topology of the multi-stage LC resonant circuit, the inductors and capacitors are welded to form the main body of the filter circuit. The input port is connected to one end of the first capacitor C1, the fourth capacitor C4, the fifth capacitor C5 and the second inductor L2, the other end of the fourth capacitor C4 and the fifth capacitor C5 is grounded, the other end of the second inductor L2 and the first capacitor C1 is connected to the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the first inductor L1, the second capacitor C2 and the thirteenth capacitor C13, the other end of the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 is grounded, the other end of the first inductor L1, the second capacitor C2 and the thirteenth capacitor C13 is connected to the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the third inductor L3 and the third capacitor C3, the other end of the third inductor L3 and the third capacitor C3 is connected to the twelfth capacitor C12 and the output port, and the other end of the twelfth capacitor C12 is grounded.

[0021] The filter circuit is composed of a multi-stage LC resonant circuit, which enables the filter to produce different responses to signals of different frequencies. In each stage, the values of inductors and capacitors are selected to resonate at a specific frequency (i.e., the cutoff frequency). When the frequency of the signal is lower than the cutoff frequency, the signal can pass through the stage relatively easily; when the frequency of the signal is higher than the cutoff frequency, the signal will be attenuated or filtered out by the stage. By reasonably configuring the parameters of inductors and capacitors in each stage, the cutoff frequency of the filter can be accurately set. This enables the filter to accurately filter out high-frequency signals above the set cutoff frequency while preserving low-frequency signals. The inductor elements are made of high-power magnetic cores and enameled wire, and the capacitor elements are multilayer ceramic capacitors. The high precision and low loss characteristics of these components help achieve more accurate cutoff frequency control. During signal transmission, the filter processes the signal step by step through the multi-stage LC resonant circuit, and each stage attenuates signals above the cutoff frequency. Due to the use of high-precision inductor and capacitor elements and the optimized multi-stage resonant circuit design, the filter can maximize the preservation of signal energy in the frequency band near the cutoff frequency, reducing the insertion loss.

[0022] The filter uses miniaturized components and high-power inductors, high-voltage capacitors, etc., making the filter structure more compact and simple. This not only reduces manufacturing costs, but also makes the filter easier to use and integrate in small electronic devices.

[0023] The utility model discloses a high-precision LC filter, comprising a high-precision inductor and a high-precision capacitor, wherein the high-precision inductor and the high-precision capacitor are connected in series to form a multi-stage LC resonant circuit.

[0024] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the utility model, and it should be understood that the above-described specific embodiments are merely examples of the utility model and are not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A high power filter suitable for low frequencies, characterized in that: The application relates to a filter circuit, which comprises an input port, an output port and a filter circuit, wherein the filter circuit comprises a multi-stage LC resonant circuit topology, the inductive element in each stage of the LC resonant circuit is composed of a magnetic ring-wound enameled wire, and the capacitive element is a multilayer ceramic capacitor; one end of the inductive element of the first stage of the LC resonant circuit is connected to the input port, the other end is connected to the ground in series with a capacitor, and the other end of the capacitor is connected to one end of the inductive element of the next stage of the LC resonant circuit; and the output port is connected to the other end of the inductive element of the last stage of the LC resonant circuit.

2. The high power filter suitable for low frequency according to claim 1, characterized in that: The multi-stage LC resonant circuit comprises a first inductor L1, a second inductor L2, a third inductor L3, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12 and a thirteenth capacitor C13; one end of the fourth capacitor C4, one end of the fifth capacitor C5, one end of the first capacitor C1 and one end of the second inductor L2 are connected to the input port; the other end of the fourth capacitor C4 and the other end of the fifth capacitor C5 are connected to the ground; one end of the second capacitor C2, one end of the thirteenth capacitor C13 and one end of the first inductor L1 are connected to the other end of the first capacitor C1; the other end of the second inductor L2 is connected to the other end of the first capacitor C1; the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 are connected in parallel between the other end of the first capacitor C1 and the ground; one end of the third inductor L3 and one end of the third capacitor C3 are connected to the other end of the second capacitor C2; the other end of the first inductor L1 and the other end of the thirteenth capacitor C13 are connected to the other end of the second capacitor C2; the ninth capacitor C9, the tenth capacitor C10 and the eleventh capacitor C11 are connected in parallel between the other end of the second capacitor C2 and the ground; the other end of the third inductor L3, the other end of the third capacitor C3 and one end of the twelfth capacitor C12 are connected to the output port; and the other end of the twelfth capacitor C12 is connected to the ground.

3. The high power filter suitable for low frequencies according to claim 2, characterized in that: The inductance of the first magnetic ring inductor L1, the second magnetic ring inductor L2 and the third magnetic ring inductor L3 is 28uH, 20uH and 21uH respectively.

4. The high power filter suitable for low frequency according to claim 3, characterized in that: The first capacitor C1, the second capacitor C2 and the third capacitor C3 are 1.5nF, 6.8nF and 4.7nF respectively; the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7 and the eighth capacitor C8 are 8.2nF, 390pF, 560pF, 5.6nF and 10nF respectively; and the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the twelfth capacitor C12 and the thirteenth capacitor C13 are 10nF, 3.9nF, 680pF, 5.6nF and 390pF respectively.

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