CN209625075U - A kind of signal conditioning circuit applied to arrester circuit - Google Patents
A kind of signal conditioning circuit applied to arrester circuit Download PDFInfo
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- CN209625075U CN209625075U CN201920348920.0U CN201920348920U CN209625075U CN 209625075 U CN209625075 U CN 209625075U CN 201920348920 U CN201920348920 U CN 201920348920U CN 209625075 U CN209625075 U CN 209625075U
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Abstract
A kind of signal conditioning circuit applied to arrester circuit, circuit includes signal conversion circuit, bias voltage suppression circuit, signal amplification circuit and 4 rank low pass active filter circuits, and signal conversion circuit, bias voltage suppression circuit and 4 rank low pass active filter circuits are electrically connected with signal amplification circuit；Signal conversion circuit is used to the micro current signal that senser sampling circuit acquires being converted into voltage signal；Signal amplification circuit is used to amplify the voltage signal after conversion；Bias voltage suppression circuit inhibits signal for generating a bias voltage, with the bias voltage that operational amplifier generates in eliminating tolerancing signal amplifying circuit；4 rank low pass active filter circuits filter out the interference signal in signal for being filtered to amplified voltage signal.The utility model provides the micro-current that can be achieved to acquire senser sampling circuit and carries out voltage/current conversion, amplification and filtering processing, to obtain a stable output voltage signal.
Description
Technical field
The utility model relates to arrester circuit design fields, and in particular to a kind of signal tune applied to arrester circuit
Manage circuit.
Background technique
With carrying out in a deep going way for smart grid construction, power operation administrative staff get over the state of insulation of main transformer equipment
It more pays close attention to, to prevent serious accident.It is that the most critical of power transmission and transformation is set for 110kV and the above power transformer
Standby, insulation performance is related to the safety of entire power transmission network, and arrester is the key equipment for monitoring transformer equipment, so right
The monitoring of arrester and capacitance type equipment state and diagnostic accuracy require also higher and higher.In the entire hardware circuit of arrester
In, the micro-current of senser sampling circuit acquisition is smaller and unstable etc., it can not directly be analyzed, therefore be needed to micro- electricity
Stream signal is first handled, to obtain a stable output voltage signal.
Utility model content
In order to solve the above technical problems, the present invention provides a kind of signal conditioning circuit applied to arrester circuit, it can be right
The micro-current of senser sampling circuit acquisition carries out voltage/current conversion, amplification and filtering processing, thus obtain one it is stable
Output voltage signal, technical scheme is as follows:
A kind of signal conditioning circuit applied to arrester circuit, the circuit include signal conversion circuit, bias voltage
Suppression circuit, signal amplification circuit and 4 rank low pass active filter circuits, the signal conversion circuit, bias voltage suppression circuit
It is electrically connected with the signal amplification circuit with 4 rank low pass active filter circuits；The signal conversion circuit is used for and sensor
The micro current signal that senser sampling circuit acquires is converted into voltage signal by sample circuit electrical connection；The signal amplification electricity
Road is used to amplify the voltage signal after conversion；The bias voltage suppression circuit inhibits for generating a bias voltage
Signal, the bias voltage generated with operational amplifier in eliminating tolerancing signal amplifying circuit；The 4 rank low pass active filter circuit is used for
Amplified voltage signal is filtered, the interference signal in signal is filtered out.
Further, the signal conversion circuit includes the first operational amplifier U7B, resistance R33 and resistance R34, described
First operational amplifier U7B is dual power supply operational amplifier, and positive pole connects+12V voltage, and power cathode connects -12V voltage；
The output end of the first operational amplifier U7B is electrically connected by resistance R33 with negative input, and resistance R34 and signal are passed through
Amplifying circuit electrical connection；The negative input of the first operational amplifier U7B, will for being electrically connected with senser sampling circuit
The micro current signal of senser sampling circuit acquisition is converted into voltage signal, positive input ground connection.
Further, the bias voltage suppression circuit includes adjustable potentiometer WJ1, resistance R34, resistance R72 and resistance
R73；The link terminal 1 of the adjustable potentiometer WJ1 passes through the reference voltage of resistance R73 access+2.5V, fixed terminals
Son 3 passes through the reference voltage of resistance R72 access -2.5V, and sliding terminal 2 is electrically connected by resistance R35 with signal amplification circuit.
Further, the signal amplification circuit includes second operational amplifier U7A and resistance R36；Second operation
Amplifier U7A is dual power supply operational amplifier, and positive pole connects+12V voltage, and power cathode connects -12V voltage；Described first
The positive input of operational amplifier U7A is electrically connected with the output end of signal conversion circuit, negative input ground connection, output end with
The electrical connection of 4 rank low pass active filter circuits.
Further, the 4 rank low pass active filter circuit includes two 2 rank low pass active filter circuits: being respectively the
One 2 rank low pass active filter circuits and the 2nd 2 rank low pass active filter circuit, the signal amplification circuit are low by the one 2 rank
Power filter is connected with to be electrically connected with the 2nd 2 rank low pass active filter circuit.
Further, the one 2 rank low pass active filter circuit includes third operational amplifier U8A, resistance R37, electricity
Hinder R38, resistance R39, resistance R40, resistance R41, resistance R42, resistance R43, capacitor C100 and capacitor C102, the third operation
Amplifier U8A is dual power supply operational amplifier, and positive pole connects+12V voltage, and power cathode connects -12V voltage, signal amplification
Circuit passes sequentially through resistance R37, resistance R38, resistance R39, resistance R40, resistance R41 and resistance R42 and third operational amplifier
The positive input of U8A is electrically connected, and resistance R43 is in parallel with resistance R42, one end of capacitor C100 and third operational amplifier U8A
Output end electrical connection, the node between the other end and resistance R39 and resistance R40 is electrically connected, one end of capacitor C102 and third
The negative input of operational amplifier U8A is electrically connected, other end ground connection, the negative input of third operational amplifier U8A also with
The input terminal electricity of the electrical connection of itself output end, the output end of third operational amplifier U8A and the 2nd 2 rank low pass active filter circuit
Connection.
Further, the 2nd 2 rank low pass active filter circuit includes four-operational amplifier U8B, resistance 44, resistance
45, resistance 46, resistance 47, resistance 48, capacitor C101 and capacitor C103, the four-operational amplifier U8B are dual power supply operation
Amplifier, positive pole connect+12V voltage, and power cathode connects -12V voltage, the output of the one 2 rank low pass active filter circuit
End passes sequentially through the positive input of resistance 44, resistance 45, resistance 46, resistance 47 and resistance 48 and four-operational amplifier U8B
Electrical connection, one end of capacitor C103 are electrically connected with the positive input of four-operational amplifier U8B, other end ground connection, capacitor
One end of C101 is electrically connected with the output end of four-operational amplifier U8B, the section between the other end and resistance R45 and resistance R46
Point electrical connection, the negative input of four-operational amplifier U8B are also electrically connected with itself output end.
The utility model has the beneficial effects that
A kind of signal conditioning circuit applied to arrester circuit provided by the utility model is, it can be achieved that by sensor sample
The micro-current of circuit acquisition carries out voltage/current conversion, amplification and filtering processing, to obtain a stable output voltage letter
Number.
Detailed description of the invention
Fig. 1 is a kind of signal conditioning circuit frame diagram applied to arrester circuit provided by the embodiment of the utility model；
Fig. 2 is for a kind of connection of the signal conditioning circuit applied to arrester circuit provided by the embodiment of the utility model
Schematic diagram.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
It clearly and completely describes, it is clear that described embodiment is only the utility model a part, instead of all the embodiments.
Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
All other embodiment, fall within the protection scope of the utility model.
As shown in Figure 1, a kind of signal conditioning circuit applied to arrester circuit provided in an embodiment of the present invention, the electricity
Road includes signal conversion circuit, bias voltage suppression circuit, signal amplification circuit and 4 rank low pass active filter circuits, the letter
Number conversion circuit, bias voltage suppression circuit and 4 rank low pass active filter circuits are electrically connected with the signal amplification circuit；Institute
Signal conversion circuit is stated for being electrically connected with senser sampling circuit, the micro current signal of senser sampling circuit acquisition is converted
At voltage signal；The signal amplification circuit is used to amplify the voltage signal after conversion；The bias voltage inhibits electricity
Road inhibits signal for generating a bias voltage, with the bias voltage that operational amplifier generates in eliminating tolerancing signal amplifying circuit；
The 4 rank low pass active filter circuit filters out the interference letter in signal for being filtered to amplified voltage signal
Number.
As shown in Figure 2, it is preferable that the signal conversion circuit includes the first operational amplifier U7B, resistance R33 and resistance
R34, the first operational amplifier U7B are dual power supply operational amplifier, and positive pole connects+12V voltage, power cathode connects-
12V voltage；The output end of the first operational amplifier U7B is electrically connected by resistance R33 with negative input, and resistance is passed through
R34 is electrically connected with signal amplification circuit；The negative input of the first operational amplifier U7B is used for and senser sampling circuit
The micro current signal that senser sampling circuit acquires is converted into voltage signal, positive input ground connection by electrical connection.
In above-described embodiment, the first operational amplifier U7B and R33 constitutes current/voltage converter circuit, and current signal is turned
It changes voltage signal into, in the present embodiment, the current signal of 1uA or so can be transformed to the voltage signal of 1mV or so.
Preferably, the bias voltage suppression circuit includes adjustable potentiometer WJ1, resistance R34, resistance R72 and resistance
R73；The link terminal 1 of the adjustable potentiometer WJ1 passes through the reference voltage of resistance R73 access+2.5V, fixed terminals
Son 3 passes through the reference voltage of resistance R72 access -2.5V, and sliding terminal 2 is electrically connected by resistance R35 with signal amplification circuit.
In above-described embodiment, in order to cut down the direct current biasing of the second operational amplifier U7A in signal amplification circuit below
It influences, in the present embodiment, reference voltage is adjusted using adjustable potentiometer WJ1, the benchmark after adjusting caused by voltage
Voltage exports a reversed direct current signal, makes the signal with second operational amplifier after second operational amplifier U7A
The DC offset voltage of U7A is equal in magnitude, and polarity is on the contrary, can effectively cut down the influence of amplifier bring.
Preferably, the signal amplification circuit includes second operational amplifier U7A and resistance R36；Second operation is put
Big device U7A is dual power supply operational amplifier, and positive pole connects+12V voltage, and power cathode connects -12V voltage；First fortune
The positive input for calculating amplifier U7A is electrically connected with the output end of signal conversion circuit, negative input ground connection, output end and 4
The electrical connection of rank low pass active filter circuit.
In above-described embodiment, the signal amplification circuit can amplify the voltage signal after conversion, and pass through biasing
The bias voltage that voltage-suppressing circuit generates inhibits signal, so that the output end in second operational amplifier U7A exports one instead
To direct current signal, keep the signal equal in magnitude with the DC offset voltage of second operational amplifier U7A, polarity on the contrary,
Effectively abatement amplifier bring influences.
Preferably, the 4 rank low pass active filter circuit includes two 2 rank low pass active filter circuits: being respectively the 1st
Rank low pass active filter circuit and the 2nd 2 rank low pass active filter circuit, the signal amplification circuit have by the one 2 rank low pass
Power filter is electrically connected with the 2nd 2 rank low pass active filter circuit.
Preferably, the one 2 rank low pass active filter circuit includes third operational amplifier U8A, resistance R37, resistance
R38, resistance R39, resistance R40, resistance R41, resistance R42, resistance R43, capacitor C100 and capacitor C102, the third operation are put
Big device U8A is dual power supply operational amplifier, and positive pole connects+12V voltage, and power cathode connects -12V voltage, signal amplification electricity
Road passes sequentially through resistance R37, resistance R38, resistance R39, resistance R40, resistance R41 and resistance R42 and third operational amplifier U8A
Positive input electrical connection, resistance R43 is in parallel with resistance R42, and one end of capacitor C100 is defeated with third operational amplifier U8A's
Outlet electrical connection, the node between the other end and resistance R39 and resistance R40 are electrically connected, one end of capacitor C102 and third operation
The negative input of amplifier U8A is electrically connected, other end ground connection, the negative input of third operational amplifier U8A also with itself
Output end electrical connection, the output end of third operational amplifier U8A and the input terminal of the 2nd 2 rank low pass active filter circuit are electrically connected
It connects.
Preferably, the 2nd 2 rank low pass active filter circuit includes four-operational amplifier U8B, resistance 44, resistance
45, resistance 46, resistance 47, resistance 48, capacitor C101 and capacitor C103, the four-operational amplifier U8B are dual power supply operation
Amplifier, positive pole connect+12V voltage, and power cathode connects -12V voltage, the output of the one 2 rank low pass active filter circuit
End passes sequentially through the positive input of resistance 44, resistance 45, resistance 46, resistance 47 and resistance 48 and four-operational amplifier U8B
Electrical connection, one end of capacitor C103 are electrically connected with the positive input of four-operational amplifier U8B, other end ground connection, capacitor
One end of C101 is electrically connected with the output end of four-operational amplifier U8B, the section between the other end and resistance R45 and resistance R46
Point electrical connection, the negative input of four-operational amplifier U8B are also electrically connected with itself output end.
In above-described embodiment, resistance R37- resistance R48, capacitor C100- capacitor C103, third operational amplifier U8A, the 4th
Operational amplifier U8B collectively forms a 4 rank low-pass active filters, filters out the interference signal in signal, to export useful
Voltage signal, the output signal AOUT that the exportable bandwidth of the circuit is 0---100Hz, gain amplifier is 0db.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, all practical at this
Within novel spirit and principle, any modification, equivalent replacement, improvement and so on should be included in the guarantor of the utility model
Within the scope of shield.
Claims (7)
1. a kind of signal conditioning circuit applied to arrester circuit, which is characterized in that the circuit include signal conversion circuit,
Bias voltage suppression circuit, signal amplification circuit and 4 rank low pass active filter circuits, the signal conversion circuit, bias voltage
Suppression circuit and 4 rank low pass active filter circuits are electrically connected with the signal amplification circuit；The signal conversion circuit is used for
The micro current signal that senser sampling circuit acquires is converted into voltage signal；The signal amplification circuit will be for after converting
Voltage signal amplifies；The bias voltage suppression circuit inhibits signal for generating a bias voltage, with eliminating tolerancing signal
The bias voltage that operational amplifier generates in amplifying circuit；The 4 rank low pass active filter circuit is used for amplified voltage
Signal is filtered, and filters out the interference signal in signal.
2. the signal conditioning circuit according to claim 1 applied to arrester circuit, which is characterized in that the signal turns
Changing circuit includes the first operational amplifier U7B, resistance R33 and resistance R34, and the first operational amplifier U7B is dual power supply fortune
Amplifier is calculated, positive pole connects+12V voltage, and power cathode connects -12V voltage；The output of the first operational amplifier U7B
End is electrically connected by resistance R33 with negative input, is electrically connected by resistance R34 with signal amplification circuit；First operation
The negative input of amplifier U7B with senser sampling circuit for being electrically connected, by the micro-current of senser sampling circuit acquisition
Signal is converted into voltage signal, positive input ground connection.
3. the signal conditioning circuit according to claim 1 applied to arrester circuit, which is characterized in that the biased electrical
Pressing suppression circuit includes adjustable potentiometer WJ1, resistance R34, resistance R72 and resistance R73；The fixation of the adjustable potentiometer WJ1
Connecting terminal 1 passes through the reference voltage of resistance R73 access+2.5V, and link terminal 3 passes through the base of resistance R72 access -2.5V
Quasi- voltage, sliding terminal 2 are electrically connected by resistance R35 with signal amplification circuit.
4. the signal conditioning circuit according to claim 1 applied to arrester circuit, which is characterized in that the signal is put
Big circuit includes second operational amplifier U7A and resistance R36；The second operational amplifier U7A is dual power supply operational amplifier,
Its positive pole connects+12V voltage, and power cathode connects -12V voltage；The positive input and letter of the second operational amplifier U7A
The output end electrical connection of number conversion circuit, negative input ground connection, output end are electrically connected with 4 rank low pass active filter circuits.
5. the signal conditioning circuit according to claim 1 applied to arrester circuit, which is characterized in that 4 rank is low
Being connected with power filter includes two 2 rank low pass active filter circuits: being respectively the one 2 rank low pass active filter circuit and second
2 rank low pass active filter circuits, the signal amplification circuit pass through the one 2 rank low pass active filter circuit and the 2nd 2 rank low pass
Active filter circuit electrical connection.
6. the signal conditioning circuit according to claim 5 applied to arrester circuit, which is characterized in that the described 1st
Rank low pass active filter circuit includes third operational amplifier U8A, resistance R37, resistance R38, resistance R39, resistance R40, resistance
R41, resistance R42, resistance R43, capacitor C100 and capacitor C102, the third operational amplifier U8A are dual power supply operation amplifier
Device, positive pole connect+12V voltage, and power cathode connects -12V voltage, and signal amplification circuit passes sequentially through resistance R37, resistance
R38, resistance R39, resistance R40, resistance R41 and resistance R42 are electrically connected with the positive input of third operational amplifier U8A, electricity
Resistance R43 is in parallel with resistance R42, and one end of capacitor C100 is electrically connected with the output end of third operational amplifier U8A, the other end and electricity
Hinder the node electrical connection between R39 and resistance R40, one end of capacitor C102 and the negative input of third operational amplifier U8A
Electrical connection, other end ground connection, the negative input of third operational amplifier U8A are also electrically connected with itself output end, third operation
The output end of amplifier U8A is electrically connected with the input terminal of the 2nd 2 rank low pass active filter circuit.
7. the signal conditioning circuit according to claim 5 applied to arrester circuit, which is characterized in that the described 2nd 2
Rank low pass active filter circuit includes four-operational amplifier U8B, resistance 44, resistance 45, resistance 46, resistance 47, resistance 48, electricity
Holding C101 and capacitor C103, the four-operational amplifier U8B is dual power supply operational amplifier, and positive pole connects+12V electricity
Pressure, power cathode connect -12V voltage, and the output end of the one 2 rank low pass active filter circuit passes sequentially through resistance 44, resistance 45, electricity
Resistance 46, resistance 47 and resistance 48 are electrically connected with the positive input of four-operational amplifier U8B, one end of capacitor C103 and the 4th
The positive input of operational amplifier U8B is electrically connected, other end ground connection, one end of capacitor C101 and four-operational amplifier U8B
Output end electrical connection, the node between the other end and resistance R45 and resistance R46 be electrically connected, and four-operational amplifier U8B's bears
It is also electrically connected to input terminal with itself output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920348920.0U CN209625075U (en) | 2019-03-19 | 2019-03-19 | A kind of signal conditioning circuit applied to arrester circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920348920.0U CN209625075U (en) | 2019-03-19 | 2019-03-19 | A kind of signal conditioning circuit applied to arrester circuit |
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| CN209625075U true CN209625075U (en) | 2019-11-12 |
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| CN201920348920.0U Active CN209625075U (en) | 2019-03-19 | 2019-03-19 | A kind of signal conditioning circuit applied to arrester circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113341213A (en) * | 2021-06-11 | 2021-09-03 | 重庆大学 | Single-power-supply portable friction nano generator sensor |
-
2019
- 2019-03-19 CN CN201920348920.0U patent/CN209625075U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113341213A (en) * | 2021-06-11 | 2021-09-03 | 重庆大学 | Single-power-supply portable friction nano generator sensor |
| CN113341213B (en) * | 2021-06-11 | 2024-04-26 | 重庆大学 | Portable friction nano generator sensor powered by single power supply |
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