CN2550962Y - Notch circuit device - Google Patents

Abstract

The utility model provides a wave trap circuit device, comprising a wave trap circuit, wherein the circuit comprises two mutually connected parallel resonant circuits, and a grounded series resonant circuit is connected between the two parallel resonant circuits; the parallel resonant circuit is formed by an inductor and a capacitor connected in series and an inductor connected in parallel, and the series resonant circuit is formed by a capacitor and an inductor connected in series; the utility model can be applied to communication products and video products to prevent interference signals or cut-wave signal sources, and can protect original signals or filter out interference sources.

Description

Notch circuit device

technical field

The utility model relates to an anti-interference circuit, in particular to a wave trap circuit device which can filter out unnecessary signal sources or interference sources to reduce losses.

Background technique

Press, the dB value of the general signal source will be lost due to transmission, coupled with some unnecessary signal sources or interference sources, resulting in signal distortion or excessive noise interference. For example, if it is used in audio-visual, the image will be unclear or noise will be generated.

Contents of the invention

The main purpose of the utility model is to provide a wave trap circuit device, which can be used in communication products and video products to prevent interference signals or cut-off signal sources, and can protect original signals or filter out interference sources.

In order to achieve the above object, the utility model provides a trap circuit device, which includes two parallel resonant circuits connected to each other, and a grounded series resonant circuit connected between the two parallel resonant circuits; the parallel resonant circuit consists of An inductor and a capacitor connected in series are formed by an inductor connected in parallel, and the series resonant circuit is formed by a capacitor connected in series with an inductor.

From the above structure, it can be known that the utility model has the following advantages:

1. It can filter out unnecessary signal sources or interference sources, reduce connection loss, and protect the original signal.

2. As long as the parameters of the inductance and capacitance are changed, the preset frequency band can be filtered out for the signal source to be used as a notch filter.

3. The levels of the same parameter value can be connected in series, so that the filtered signal can reach a deeper loss point, such as above 50-60dB, or the series of different parameter values can be connected in series to filter out several stages and different frequency response segment.

Description of drawings

Fig. 1: the circuit diagram of the utility model;

Fig. 2: waveform diagram of the utility model;

Figure 3: The utility model is applied to the circuit diagram of the 470-606MHZ frequency band;

Figure 4: Waveform diagram of the utility model applied to the 470-606MHZ frequency band;

Figure 5: The utility model is applied to the circuit diagram of the 112-164MHZ frequency band;

Figure 6: The waveform diagram of the utility model applied to the 112-164MHZ frequency band;

Fig. 7: The circuit diagram of the utility model in cascading several stages.

Detailed ways

First please refer to Fig. 1, the trap circuit device 1 of the present utility model is connected with two parallel resonant circuits 11, and a grounded series resonant circuit 12 is connected between the two parallel resonant circuits 11; wherein, the parallel resonant circuit 11 connects the phase An inductor L1 and a capacitor C1 are connected in series and an inductor L2 is connected in parallel, and the series resonant circuit 12 is formed by connecting a capacitor C2 and an inductor L3 in series.

Please also refer to Fig. 2, the trap circuit device 1 of the present invention can be widely used in equipment filtering at 5MHZ-2GHZ frequency, and can filter out the frequency response section from f2-f3, and its signal f1-f2 Or f3 to f4 up to a larger loss deep point. Furthermore, please refer to Figures 3 and 4, the trap circuit device 1 of the present invention is used for filtering in the 470-606MHZ frequency band, the capacitor C1 is set to 4P, the capacitor C2 is set to 2P, and the inductors L1 and L2 are set to 0.35 × 0.9 × 5t, the inductance L3 is set to 0.35 × 1.6 × 8t, the frequency response section of 470 ~ 606MHZ can be filtered out; in addition, please refer to Figures 5 and 6, which are the notch circuit of the present invention Device 1 is used for filtering in the 112-164MHZ frequency band. Set capacitor C1 to 25P, capacitor C2 to 15P, inductors L1 and L2 to 0.25×1.8×7t, and inductor L3 to 0.25×1.85×10t to filter out 112 ~ 164MHZ frequency response section. Please also refer to Fig. 7, the wave trap circuit device 1 of the present invention can also be used in series with several levels, such as the wave trap circuit device 1 of the present invention with the same frequency response section that can be filtered out Connected in series, every level of series connection can make the signal f1～f2 or f3 or f4 loss depth deepened by one level, so that it can reach a lower loss depth point, such as to more than 50～60dB, or can The different frequency response sections of the utility model notch circuit device 1 is cascaded in series, as shown in Fig. 3, 4, and the circuit cascade connection of two different frequency response sections in Fig. 5, 6 can filter out 112～164MHZ , 470 ~ 606MHZ two frequency response section.

When in use, the wave trap circuit device 1 can be applied to video products, such as being connected to a filter; it can be used in communication products, such as being connected to the signal input end of a wireless circuit circuit board; or used in various anti-electromagnetic interference equipment, etc. A place to filter out unnecessary signal sources or interference sources and reduce losses, thereby protecting the original signal or filtering out interference sources.

The above-described embodiment is only to illustrate the technical ideas and characteristics of the present utility model, and its purpose is to enable those who are familiar with this art to understand the content of the present utility model and implement it accordingly, and should not limit the patent scope of the present utility model with it , that is, all equivalent changes or modifications made according to the spirit disclosed in the utility model should still be covered within the scope of the claims of the utility model.

Claims (2)

1. A wave trap circuit device, comprising a wave trap circuit, is characterized in that: the circuit comprises two parallel resonant circuits (11) connected to each other, and a grounded series resonant circuit is connected between the two parallel resonant circuits circuit (12); the parallel resonant circuit (11) is formed by connecting an inductance (L2) in parallel with an inductance (L1) and a capacitor (C1) in series, and the series resonant circuit (12) is formed by a capacitor (C2 ) is connected in series with an inductor (L3). 2. The wave trap circuit device according to claim 1, characterized in that: the parameter values of the inductors (L1-L3) and capacitors (C1, C2) vary according to different usage conditions.

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