CN213402819U - Filtering anti-interference circuit - Google Patents
Filtering anti-interference circuit Download PDFInfo
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- CN213402819U CN213402819U CN202022238917.9U CN202022238917U CN213402819U CN 213402819 U CN213402819 U CN 213402819U CN 202022238917 U CN202022238917 U CN 202022238917U CN 213402819 U CN213402819 U CN 213402819U
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Abstract
The utility model discloses a filtering anti-jamming circuit, include: the first filter circuit, the amplifying circuit, the following amplitude limiting circuit, the second filter circuit and the voltage stabilizing output circuit are connected in sequence; the first filter circuit includes: the first inductor, the first resistor, external signals are connected respectively to one end after the first capacitor is parallelly connected, second capacitor one end, the other end ground connection, the inverting input of first fortune ware is connected respectively to the second capacitor other end, the one end of fourth resistor, the one end of second inductor is connected to the other end of fourth resistor, the second inductor other end ground connection, the one end of second resistor is connected respectively to first fortune ware homophase input, third resistor one end, the ground connection of second resistor other end, the output of first fortune ware is connected to the third resistor other end, the one end of fifth resistor is still connected respectively to the output of first fortune ware, the amplifier circuit input, the ground connection of the fifth resistor other end. Adopt the utility model discloses, can improve the interference killing feature of signal and the output is stable.
Description
Technical Field
The utility model relates to a circuit field especially relates to a filtering anti jamming circuit.
Background
With the development of automation control technology, equipment control systems are more and more complex, more and more control instruments are installed, each instrument needs to have a plurality of voltage values and current values to be acquired, the voltage values and the current values are converted through an analog-digital circuit and then acquired into a computer to be displayed, and therefore a user can know the operation condition of the instrument at any time.
When a plurality of instruments work simultaneously, especially in the application occasions of high-voltage high-frequency instruments, the mutual influence and interference of the instruments are more and more common. After the signals collected by each instrument are sent to a computer for display, serious signal interference phenomena exist, the display and analysis of the signals by the computer are influenced, and the working condition of the instrument cannot be truly reflected. In order to solve the problem, the utility model provides a filtering anti-jamming circuit.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, the utility model aims at providing a filtering anti-jamming circuit can improve the interference killing feature of signal and the output is stable.
Based on this, the utility model provides a filtering anti jamming circuit, the circuit includes:
the first filter circuit, the amplifying circuit, the following amplitude limiting circuit, the second filter circuit and the voltage stabilizing output circuit are connected in sequence;
wherein the first filter circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a first operational amplifier, a first inductor and a second inductor; the first inductor, the first resistor and the first capacitor are connected in parallel, one end of the first inductor is connected with an external signal input end and one end of the second capacitor, the other end of the first inductor is grounded, the other end of the second capacitor is connected with an inverting input end of the first operational amplifier and one end of a fourth resistor, the other end of the fourth resistor is connected with one end of the second inductor, the other end of the second inductor is grounded, a non-inverting input end of the first operational amplifier is connected with one end of the second resistor and one end of the third resistor, the other end of the second resistor is grounded, the other end of the third resistor is connected with an output end of the first operational amplifier, an output end of the first operational amplifier is further connected with one end of the fifth resistor and an input end of the amplifying circuit, and the other end of the fifth resistor is grounded.
Wherein the amplifying circuit comprises: a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor and an amplifying chip; one end of the sixth resistor is connected with the output end of the first filter circuit, the other end of the sixth resistor is connected with one end of the third capacitor and the + IN end of the amplifying chip respectively, the other end of the third capacitor is grounded, the output end of the amplifying chip is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with one end of the seventh resistor and the-IN end of the amplifying chip respectively, and the other end of the seventh resistor is grounded.
The type of the amplification chip is OP 177.
The following amplitude limiting circuit comprises a second operational amplifier, a ninth resistor, a first diode and a fourth capacitor; the non-inverting input end of the second operational amplifier is connected with the output end of the amplifying circuit, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, the output end of the second operational amplifier is further connected with one end of a ninth resistor, the other end of the ninth resistor is respectively connected with one end of the first diode and one end of the fourth capacitor, the other end of the first diode is grounded, and the other end of the fourth capacitor is grounded.
The second filter circuit comprises a fifth capacitor and a tenth resistor; one end of the fifth capacitor is connected with the output end of the following amplitude limiting circuit, the other end of the fifth capacitor is respectively connected with one end of the tenth resistor and the input end of the voltage stabilizing output circuit, and the other end of the tenth resistor is grounded.
Wherein, the steady voltage output circuit includes: the first triode, the eleventh resistor and the second diode; the collector of the first diode is respectively connected with the output end of the second filter circuit and one end of the eleventh resistor, the other end of the eleventh resistor is connected with the cathode of the second diode, the cathode of the second diode is also connected with the base of the second diode, the anode of the second diode is grounded, and the emitter of the second diode is used as the output end of the voltage stabilizing output circuit.
The first triode is an NPN type triode.
The utility model discloses in, first filter circuit is low pass filter circuit, in the low pass filter circuit, parallelly connected back and the parallelly connected first filtering T type structure of second electric capacity of first resistance, first inductance, first electric capacity, after fourth resistance, second inductance are established ties with parallelly connected constitution second filtering T type structure of second resistance to through the parallel resonance circuit who sets up two-stage T type structure filtering, in order to obtain more circuit zero points, increase the zero number of circuit and filter, improve the interference killing feature, reinforcing outband restraines. The amplifying circuit can amplify a small signal with low frequency. The second operational amplifier is a voltage follower and can isolate the influence between front and rear-stage circuits, the ninth resistor, the first diode and the fourth capacitor are used for amplitude limiting, and the voltage stabilizing output circuit is used for ensuring stable signal output. Adopt the utility model discloses, can improve the interference killing feature of signal and the output is stable.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a filtering and anti-interference circuit provided by an embodiment of the present invention;
fig. 2 is a circuit diagram of a filtering anti-jamming circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Fig. 1 is a schematic diagram of a filtering anti-jamming circuit provided by the embodiment of the present invention, the circuit includes:
a first filter circuit 101, an amplifying circuit 102, a following amplitude limiting circuit 103, a second filter circuit 104 and a voltage stabilizing output circuit 105 which are connected in sequence;
the first filter circuit 101 is connected to an external signal input terminal, which may be an output terminal of a current sensor, a voltage sensor, or the like, and the output terminal of the voltage stabilization output circuit 105 may be connected to a device or a device capable of processing, analyzing, or displaying a signal, such as a processor, a controller, a computer, or the like.
Fig. 2 is a circuit diagram of a filtering anti-jamming circuit provided by the embodiment of the present invention, the first filter circuit includes: a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a first operational amplifier AR1, a first inductor L1 and a second inductor L2; the first inductor L1, the first resistor R1 and the first capacitor C1 are connected in parallel, one end of the parallel connection is respectively connected with an external signal input end and one end of the second capacitor C2, the other end is grounded, the other end of the second capacitor C2 is connected to the inverting input terminal of the first operational amplifier AR1 and one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to one end of the second inductor L2, the other end of the second inductor L2 is grounded, the non-inverting input terminal of the first operational amplifier AR1 is connected to one end of the second resistor R2 and one end of the third resistor R3 respectively, the other end of the second resistor R2 is grounded, the other end of the third resistor R3 is connected to the output end of the first operational amplifier AR1, the output end of the first operational amplifier AR1 is further connected to one end of the fifth resistor R5 and the input end of the amplifying circuit, respectively, and the other end of the fifth resistor R5 is grounded.
The amplification circuit includes: a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3 and an amplifying chip; one end of the sixth resistor R6 is connected with the output end of the first filter circuit, the other end of the sixth resistor R6 is connected with one end of the third capacitor C3 and the + IN end of the amplification chip respectively, the other end of the third capacitor C3 is grounded, the output end of the amplification chip is connected with one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected with one end of the seventh resistor R7 and the-IN end of the amplification chip respectively, and the other end of the seventh resistor R7 is grounded.
The model of the amplifying chip is OP 177.
The following amplitude limiting circuit comprises a second operational amplifier AR2, a ninth resistor R9, a first diode D1 and a fourth capacitor C4; the non-inverting input end of the second operational amplifier AR2 is connected to the output end of the amplifying circuit, the inverting input end of the second operational amplifier AR2 is connected to the output end of the second operational amplifier AR2, the output end of the second operational amplifier AR2 is further connected to one end of a ninth resistor R9, the other end of the ninth resistor R9 is connected to one end of the first diode D1 and one end of the fourth capacitor C4, the other end of the first diode D1 is grounded, and the other end of the fourth capacitor C4 is grounded.
The second filter circuit comprises a fifth capacitor C5 and a tenth resistor R10; one end of the fifth capacitor C5 is connected to the output end of the following amplitude limiting circuit, the other end of the fifth capacitor C5 is connected to one end of the tenth resistor R10 and the input end of the voltage stabilizing output circuit, respectively, and the other end of the tenth resistor R10 is grounded.
The voltage stabilization output circuit includes: the circuit comprises a first triode T1, an eleventh resistor R11 and a second diode; the collector of the first diode D1 is connected to the output end of the second filter circuit and one end of the eleventh resistor R11, respectively, the other end of the eleventh resistor R11 is connected to the cathode of the second diode, the cathode of the second diode is further connected to the base of the second diode, the anode of the second diode is grounded, and the emitter of the second diode is used as the output end of the regulated output circuit.
The first triode T1 is an NPN type triode.
The utility model discloses in, first filter circuit is low pass filter circuit, in the low pass filter circuit, parallelly connected back and the parallelly connected first filtering T type structure of second electric capacity C2 of first resistance R1, first inductance L1, first electric capacity C1, fourth resistance R4, second inductance L2 after establishing ties with second resistance R2 is parallelly connected to constitute second filtering T type structure, through the parallel resonance circuit who sets up two-stage T type structure filtering to obtain more circuit zeros, the zero number that increases the circuit filters, improves the interference killing feature, strengthens outband suppression. The amplifying circuit can amplify a small signal with low frequency. The second operational amplifier AR2 is a voltage follower capable of isolating the influence between the front and rear stage circuits, the ninth resistor R9, the first diode D1 and the fourth capacitor C4 are used for amplitude limiting, and the voltage stabilizing output circuit is used for ensuring stable output of signals. Adopt the utility model discloses, can improve the interference killing feature of signal and the output is stable.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.
Claims (7)
1. A filtering immunity circuit, comprising: the first filter circuit, the amplifying circuit, the following amplitude limiting circuit, the second filter circuit and the voltage stabilizing output circuit are connected in sequence; wherein the first filter circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a first operational amplifier, a first inductor and a second inductor; the first inductor, the first resistor and the first capacitor are connected in parallel, one end of the first inductor is connected with an external signal input end and one end of the second capacitor, the other end of the first inductor is grounded, the other end of the second capacitor is connected with an inverting input end of the first operational amplifier and one end of a fourth resistor, the other end of the fourth resistor is connected with one end of the second inductor, the other end of the second inductor is grounded, a non-inverting input end of the first operational amplifier is connected with one end of the second resistor and one end of the third resistor, the other end of the second resistor is grounded, the other end of the third resistor is connected with an output end of the first operational amplifier, an output end of the first operational amplifier is further connected with one end of the fifth resistor and an input end of the amplifying circuit, and the other end of the fifth resistor is grounded.
2. The filtering and jammer rejection circuit according to claim 1 wherein said amplification circuit comprises: a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor and an amplifying chip; one end of the sixth resistor is connected with the output end of the first filter circuit, the other end of the sixth resistor is connected with one end of the third capacitor and the + IN end of the amplifying chip respectively, the other end of the third capacitor is grounded, the output end of the amplifying chip is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with one end of the seventh resistor and the-IN end of the amplifying chip respectively, and the other end of the seventh resistor is grounded.
3. The antijam filter circuit of claim 2 wherein said amplifier chip is of type OP 177.
4. The filter immunity circuit of claim 1, wherein said follow limiter circuit comprises a second op amp, a ninth resistor, a first diode, a fourth capacitor; the non-inverting input end of the second operational amplifier is connected with the output end of the amplifying circuit, the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, the output end of the second operational amplifier is further connected with one end of a ninth resistor, the other end of the ninth resistor is respectively connected with one end of the first diode and one end of the fourth capacitor, the other end of the first diode is grounded, and the other end of the fourth capacitor is grounded.
5. The filtered immunity circuit of claim 1 wherein said second filter circuit includes a fifth capacitor, a tenth resistor; one end of the fifth capacitor is connected with the output end of the following amplitude limiting circuit, the other end of the fifth capacitor is respectively connected with one end of the tenth resistor and the input end of the voltage stabilizing output circuit, and the other end of the tenth resistor is grounded.
6. The filtering and jammer rejection circuit according to claim 4, wherein said regulated output circuit comprises: the first triode, the eleventh resistor and the second diode; the collector of the first diode is respectively connected with the output end of the second filter circuit and one end of the eleventh resistor, the other end of the eleventh resistor is connected with the cathode of the second diode, the cathode of the second diode is also connected with the base of the second diode, the anode of the second diode is grounded, and the emitter of the second diode is used as the output end of the voltage stabilizing output circuit.
7. The filter and jammer rejection circuit of claim 6 wherein said first transistor is an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022238917.9U CN213402819U (en) | 2020-10-10 | 2020-10-10 | Filtering anti-interference circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022238917.9U CN213402819U (en) | 2020-10-10 | 2020-10-10 | Filtering anti-interference circuit |
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| Publication Number | Publication Date |
|---|---|
| CN213402819U true CN213402819U (en) | 2021-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022238917.9U Active CN213402819U (en) | 2020-10-10 | 2020-10-10 | Filtering anti-interference circuit |
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| CN (1) | CN213402819U (en) |
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