CN110995185B - High-frequency acquisition system for weak signals - Google Patents
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- CN110995185B CN110995185B CN201911283998.XA CN201911283998A CN110995185B CN 110995185 B CN110995185 B CN 110995185B CN 201911283998 A CN201911283998 A CN 201911283998A CN 110995185 B CN110995185 B CN 110995185B
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Abstract
The invention discloses a high-frequency acquisition system for weak signals, which is used for solving the problem that the weak signals are seriously distorted because acquisition points are too few in acquisition time due to low frequency in the acquisition process; the device comprises a voltage following module, a differential amplification module, an AD acquisition module and a multi-way switch U8; the voltage following module for accessing the voltage signal and preventing the voltage signal from being attenuated is connected with the multi-way switch U8, and the multi-way switch U8 is connected with the differential amplifying module for carrying out differential amplification on the voltage signal; according to the invention, the voltage following module is connected with the multi-way switch U8 signal, so that the signals are prevented from being attenuated in the transmission process, the signals are processed by the differential amplification module, the common-mode interference of the signals can be reduced, and the analog signals are converted into digital signals by the AD acquisition module, so that the acquired signals are closer to the original signals, and the consistency of the acquired signals and the original signals is ensured.
Description
Technical Field
The invention relates to the technical field of signal acquisition, in particular to a high-frequency acquisition system for weak signals.
Background
As human society moves into the information age, the science and technology has changed over the sky, the information technology has been rapidly developed, and has been deeply integrated into people's daily life and work. The information technology mainly comprises information acquisition, information transmission, information processing, information recording, application and the like. Among them, information acquisition technology is the basis of information technology, and data acquisition is the main means and method of information acquisition.
Weak signals are defined from a relative angle, and weak signals refer to signals whose signal amplitudes are much weaker than noise. In the process of acquisition, weak signals can cause too few acquisition points in acquisition time due to low frequency, so that the signals are seriously distorted.
Disclosure of Invention
The invention aims to provide a high-frequency acquisition system for weak signals, which is characterized in that a voltage following module is firstly used for being connected with a multi-way switch U8 signal, so that the signals are prevented from being attenuated in the transmission process, the signals are processed by a differential amplification module, the common-mode interference of the signals can be reduced, and the analog signals are converted into digital signals by an AD acquisition module, so that the acquired signals are closer to the original signals, and the consistency of the acquired signals and the original signals is ensured.
The technical problems to be solved by the invention are as follows:
1. the method is used for solving the problem that the weak signals are seriously distorted due to too few acquisition points in the acquisition time caused by low frequency in the acquisition process;
the aim of the invention can be achieved by the following technical scheme: a high-frequency acquisition system of weak signals comprises a voltage following module, a differential amplification module, an AD acquisition module and a multi-way switch U8;
the voltage following module used for accessing the voltage signal and preventing the voltage signal from being attenuated is connected with the multi-way switch U8, the multi-way switch U8 is connected with the differential amplification module used for carrying out differential amplification on the voltage signal, and the differential amplification module is connected with the AD acquisition module used for converting the analog signal into the digital signal;
the voltage following module comprises two paths of voltage followers U13 and U21A;
the differential amplification module comprises a voltage follower U31B connected with the multi-way switch U8 and a differential amplifier U10 connected with the voltage follower U31B and used for transmitting differential signals to the AD acquisition module;
the input end of the differential amplifier U10 is connected with a voltage follower U14A, and the input end of the voltage follower U14A is connected with a reference voltage source U15;
the AD acquisition module comprises an analog-to-digital converter U11, the output end of the differential amplification module is connected with the analog-to-digital converter U11, and the analog-to-digital converter U11 is connected with the singlechip through the photoelectric coupling module
Preferably, the voltage signal connected to the voltage following module is a sensor signal.
Preferably, the reference voltage source U15 inputs a voltage of 4.096V to the input end of the differential amplifier U10 through a voltage follower U14A, and the model of the reference voltage source U15 is AD1584.
Preferably, the photoelectric coupling module comprises photoelectric couplers U7, U9 and U12; the photo-couplers U7, U9 and U12 are all TLP117.
Preferably, pin 9 of the voltage follower U13 is connected in parallel with one end of the capacitor C54 and one end of the resistor R31, and then connected with pin 3 of the voltage follower U21A; pins 6 and 8 of the voltage follower U13 are connected with pins 1 and 5 of the voltage follower U21A in parallel and then connected with the Y0 end of the multi-way switch U8; the other end of the resistor R31 is connected with one end of the resistor R15; the 7 pins of the 7-interface end voltage follower U21B of the multi-way switch U8 are connected;
the differential amplification module comprises a voltage follower U31B connected with the multi-way switch U8 and a differential amplifier U10 connected with the voltage follower U31B and used for transmitting differential signals to the AD acquisition module;
the 3 interface end of the multi-way switch U8 is connected with one end of a capacitor C49 in parallel and then connected with the 3 pin of a voltage follower U31B; the 2 pin of the voltage follower U31B is connected with the Schottky diode D13 and the 1 pin of the voltage follower U31B in parallel and then connected with one end of a resistor R21, and the other end of the resistor R21 is connected with one end of a resistor R16 in parallel and then connected with the 1 pin of the differential amplifier U10; the other end of the resistor R16 is connected with the 4 pin of the differential amplifier U10 in parallel and then connected with one end of the resistor R17; the pin 2 of the differential amplifier U10 is connected with one end of a resistor R27 and one end of a resistor R26 in parallel and then connected with one end of a capacitor C25, and the other end of the capacitor C25 is connected with the other end of the resistor R27; the other end of the resistor R26 is connected with one end of the resistor R23, the 1 pin end of the voltage follower U14A, the 3 pin end of the voltage follower U14A, one end of the capacitor C26 and one end of the capacitor C26X in parallel and then connected with the 5 interface end of the analog-to-digital converter U11; the other end of the resistor R23 is connected with one end of the resistor R22 and one end of the capacitor C36 in parallel and then connected to the 5 pin of the differential amplifier U10; the other end of the capacitor C36 is connected with the other end of the resistor R22; the 6 pin of the differential amplifier U10 is connected with one end of a resistor R13;
the other end of the capacitor C26 and the other end of the capacitor C26X are connected in parallel and then connected with the pin 2 of the voltage follower U14A; the 4-pin end of the voltage follower U14A is connected with the 1-pin end of the reference voltage source U15; the 3 pin end of the reference voltage source U15 is connected with one end of the capacitor C28 in parallel and then connected with one end of the capacitor C27; the other end of the capacitor C27 is connected with the other end of the capacitor C28;
the 1 interface end of the analog-to-digital converter U11 is connected with one end of a resistor R20; the 2 interface end of the analog-to-digital converter U11 is connected with one end of a capacitor C21 in parallel and then connected with the other end of a resistor R13; the 3 interface end of the analog-to-digital converter U11 is connected with one end of a capacitor C24 in parallel and then connected with the other end of a resistor R17; the 6 interface end of the analog-to-digital converter U11 is connected with one end of a resistor R18 and one end of a capacitor C32; the other end of the resistor R18 is connected with the other end of the capacitor C32 in parallel and then is connected to the 2 interface end of the photoelectric coupler U9; the interface end 7 of the analog-to-digital converter U11 is connected with one end of a resistor R14, and the other end of the resistor R14 is connected with the interface end 5 of the photoelectric coupler U7;
the 1 interface end of the photoelectric coupler U7 is connected with one end of the capacitor C20, the 1 interface end of the photoelectric coupler U9 and one end of the capacitor C23 in parallel and then connected with the 1 port end of the photoelectric coupler U12; the 2 interface end of the photoelectric coupler U7 is connected with the other end of the capacitor C20 and the other end of the capacitor C23 in parallel and then connected with the 3 port end of the photoelectric coupler U12; the 3 interface end of the photoelectric coupler U7 is connected with one end of the resistor R12 in parallel and then connected with one end of the capacitor C22, and the other end of the capacitor C22 is connected with the other end of the resistor R12;
the 3 interface end of the photoelectric coupler U9 is connected with one end of a capacitor C34, and the other end of the capacitor C34 is grounded; the 5 interface end of the photoelectric coupler U9 is grounded; the 1 interface end of the photoelectric coupler U12 is connected with the other end of the resistor R2O; the 4 interface end of the photoelectric coupler U12 is connected with one end of a resistor R19 and one end of a capacitor C47; the other end of the resistor R19 is connected to the other end of the capacitor C47.
Compared with the prior art, the invention has the beneficial effects that:
1. the voltage following module is firstly used for being connected with the multi-way switch U8 signal, so that the signals are prevented from being attenuated in the transmission process, the signals are processed through the differential amplification module, the common mode interference of the signals can be reduced, the analog signals are converted into digital signals through the AD acquisition module, the acquired signals are more close to the original signals, and the consistency of the acquired signals and the original signals is ensured.
Drawings
The present invention is further described below with reference to the accompanying drawings for the convenience of understanding by those skilled in the art.
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram of a circuit for connecting the voltage follower module and the multi-way switch U8;
FIG. 3 is a schematic diagram of a connection circuit between a multi-way switch U8 and a differential amplifying module according to the present invention;
fig. 4 is a schematic circuit diagram of an AD acquisition module according to the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-4, the device comprises a voltage following module, a differential amplification module, an AD acquisition module and a multi-way switch U8, wherein the voltage following module for accessing a voltage signal and preventing the voltage signal from being attenuated is connected with the multi-way switch U8, the multi-way switch U8 is connected with the differential amplification module for carrying out differential amplification on the voltage signal, and the differential amplification module is connected with the AD acquisition module for converting an analog signal into a digital signal;
the voltage signal accessed by the voltage following module is a sensor signal, and the voltage following module comprises two paths of voltage followers U13 and U21A;
the 9 pin of the voltage follower U13 is connected with one end of the capacitor C54 and one end of the resistor R31 in parallel and then connected with the 3 pin of the voltage follower U21A; pins 6 and 8 of the voltage follower U13 are connected with pins 1 and 5 of the voltage follower U21A in parallel and then connected with the Y0 end of the multi-way switch U8; the other end of the resistor R31 is connected with one end of the resistor R15; the 7 pins of the 7-interface end voltage follower U21B of the multi-way switch U8 are connected;
the differential amplification module comprises a voltage follower U31B connected with the multi-way switch U8 and a differential amplifier U10 connected with the voltage follower U31B and used for transmitting differential signals to the AD acquisition module;
the 3 interface end of the multi-way switch U8 is connected with one end of a capacitor C49 in parallel and then connected with the 3 pin of a voltage follower U31B; the 2 pin of the voltage follower U31B is connected with the Schottky diode D13 and the 1 pin of the voltage follower U31B in parallel and then connected with one end of a resistor R21, and the other end of the resistor R21 is connected with one end of a resistor R16 in parallel and then connected with the 1 pin of the differential amplifier U10; the other end of the resistor R16 is connected with the 4 pin of the differential amplifier U10 in parallel and then connected with one end of the resistor R17; the pin 2 of the differential amplifier U10 is connected with one end of a resistor R27 and one end of a resistor R26 in parallel and then connected with one end of a capacitor C25, and the other end of the capacitor C25 is connected with the other end of the resistor R27; the other end of the resistor R26 is connected with one end of the resistor R23, the 1 pin end of the voltage follower U14A, the 3 pin end of the voltage follower U14A, one end of the capacitor C26 and one end of the capacitor C26X in parallel and then connected with the 5 interface end of the analog-to-digital converter U11; the other end of the resistor R23 is connected with one end of the resistor R22 and one end of the capacitor C36 in parallel and then connected to the 5 pin of the differential amplifier U10; the other end of the capacitor C36 is connected with the other end of the resistor R22; the 6 pin of the differential amplifier U10 is connected with one end of a resistor R13;
the other end of the capacitor C26 and the other end of the capacitor C26X are connected in parallel and then connected with the pin 2 of the voltage follower U14A; the 4-pin end of the voltage follower U14A is connected with the 1-pin end of the reference voltage source U15; the 3 pin end of the reference voltage source U15 is connected with one end of the capacitor C28 in parallel and then connected with one end of the capacitor C27; the other end of the capacitor C27 is connected with the other end of the capacitor C28;
the input end of the differential amplifier U10 is connected with a voltage follower U14A, and the input end of the voltage follower U14A is connected with a reference voltage source U15;
the reference voltage source U15 inputs 4.096V voltage to the input end of the differential amplifier U10 through the voltage follower U14A, and the model of the reference voltage source U15 is AD1584;
the AD acquisition module comprises an analog-to-digital converter U11, the output end of the differential amplification module is connected with the analog-to-digital converter U11, and the analog-to-digital converter U11 is connected with the singlechip through photoelectric couplers U7, U9 and U12; the model of the analog-to-digital converter U11 is LTC1197;
the 1 interface end of the analog-to-digital converter U11 is connected with one end of a resistor R20; the 2 interface end of the analog-to-digital converter U11 is connected with one end of a capacitor C21 in parallel and then connected with the other end of a resistor R13; the 3 interface end of the analog-to-digital converter U11 is connected with one end of a capacitor C24 in parallel and then connected with the other end of a resistor R17; the 6 interface end of the analog-to-digital converter U11 is connected with one end of a resistor R18 and one end of a capacitor C32; the other end of the resistor R18 is connected with the other end of the capacitor C32 in parallel and then is connected to the 2 interface end of the photoelectric coupler U9; the interface end 7 of the analog-to-digital converter U11 is connected with one end of a resistor R14, and the other end of the resistor R14 is connected with the interface end 5 of the photoelectric coupler U7;
the 1 interface end of the photoelectric coupler U7 is connected with one end of the capacitor C20, the 1 interface end of the photoelectric coupler U9 and one end of the capacitor C23 in parallel and then connected with the 1 port end of the photoelectric coupler U12; the 2 interface end of the photoelectric coupler U7 is connected with the other end of the capacitor C20 and the other end of the capacitor C23 in parallel and then connected with the 3 port end of the photoelectric coupler U12; the 3 interface end of the photoelectric coupler U7 is connected with one end of the resistor R12 in parallel and then connected with one end of the capacitor C22, and the other end of the capacitor C22 is connected with the other end of the resistor R12;
the 3 interface end of the photoelectric coupler U9 is connected with one end of a capacitor C34, and the other end of the capacitor C34 is grounded; the 5 interface end of the photoelectric coupler U9 is grounded; the 1 interface end of the photoelectric coupler U12 is connected with the other end of the resistor R2O; the 4 interface end of the photoelectric coupler U12 is connected with one end of a resistor R19 and one end of a capacitor C47; the other end of the resistor R19 is connected with the other end of the capacitor C47;
the models of the photoelectric couplers U7, U9 and U12 are TLP117;
the working principle of the invention is as follows: the voltage following module is firstly used for being connected with the multi-way switch U8 signal, so that the signals are prevented from being attenuated in the transmission process, the signals are processed through the differential amplification module, the common mode interference of the signals can be reduced, the analog signals are converted into digital signals through the AD acquisition module, the acquired signals are more close to the original signals, and the consistency of the acquired signals and the original signals is ensured.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (5)
1. The high-frequency acquisition system for the weak signals is characterized by comprising a voltage following module, a differential amplification module, an AD acquisition module and a multi-way switch U8;
the voltage following module used for accessing the voltage signal and preventing the voltage signal from being attenuated is connected with the multi-way switch U8, the multi-way switch U8 is connected with the differential amplification module used for carrying out differential amplification on the voltage signal, and the differential amplification module is connected with the AD acquisition module used for converting the analog signal into the digital signal;
the voltage following module comprises two paths of voltage followers U13 and U21A;
the differential amplification module comprises a voltage follower U31B connected with the multi-way switch U8 and a differential amplifier U10 connected with the voltage follower U31B and used for transmitting differential signals to the AD acquisition module;
the input end of the differential amplifier U10 is connected with a voltage follower U14A, and the input end of the voltage follower U14A is connected with a reference voltage source U15;
the AD acquisition module comprises an analog-to-digital converter U11, the output end of the differential amplification module is connected with the analog-to-digital converter U11, and the analog-to-digital converter U11 is connected with the singlechip through the photoelectric coupling module.
2. The weak signal high-frequency acquisition system according to claim 1, wherein the voltage signal connected to the voltage following module is a sensor signal.
3. The weak signal high frequency acquisition system of claim 1, wherein: the reference voltage source U15 inputs 4.096V voltage to the input end of the differential amplifier U10 through the voltage follower U14A, and the model of the reference voltage source U15 is AD1584.
4. The weak signal high frequency acquisition system of claim 1, wherein: the photoelectric coupling module comprises photoelectric couplers U7, U9 and U12; the photo-couplers U7, U9 and U12 are all TLP117.
5. The weak signal high frequency acquisition system of claim 1, wherein: the 9 pin of the voltage follower U13 is connected with one end of the capacitor C54 and one end of the resistor R31 in parallel and then connected with the 3 pin of the voltage follower U21A; pins 6 and 8 of the voltage follower U13 are connected with pins 1 and 5 of the voltage follower U21A in parallel and then connected with the Y0 end of the multi-way switch U8; the other end of the resistor R31 is connected with one end of the resistor R15; the 7 pins of the 7-interface end voltage follower U21B of the multi-way switch U8 are connected;
the differential amplification module comprises a voltage follower U31B connected with the multi-way switch U8 and a differential amplifier U10 connected with the voltage follower U31B and used for transmitting differential signals to the AD acquisition module;
the 3 interface end of the multi-way switch U8 is connected with one end of a capacitor C49 in parallel and then connected with the 3 pin of a voltage follower U31B; the 2 pin of the voltage follower U31B is connected with the Schottky diode D13 and the 1 pin of the voltage follower U31B in parallel and then connected with one end of a resistor R21, and the other end of the resistor R21 is connected with one end of a resistor R16 in parallel and then connected with the 1 pin of the differential amplifier U10; the other end of the resistor R16 is connected with the 4 pin of the differential amplifier U10 in parallel and then connected with one end of the resistor R17; the pin 2 of the differential amplifier U10 is connected with one end of a resistor R27 and one end of a resistor R26 in parallel and then connected with one end of a capacitor C25, and the other end of the capacitor C25 is connected with the other end of the resistor R27; the other end of the resistor R26 is connected with one end of the resistor R23, the 1 pin end of the voltage follower U14A, the 3 pin end of the voltage follower U14A, one end of the capacitor C26 and one end of the capacitor C26X in parallel and then connected with the 5 interface end of the analog-to-digital converter U11; the other end of the resistor R23 is connected with one end of the resistor R22 and one end of the capacitor C36 in parallel and then connected to the 5 pin of the differential amplifier U10; the other end of the capacitor C36 is connected with the other end of the resistor R22; the 6 pin of the differential amplifier U10 is connected with one end of a resistor R13;
the other end of the capacitor C26 and the other end of the capacitor C26X are connected in parallel and then connected with the pin 2 of the voltage follower U14A; the 4-pin end of the voltage follower U14A is connected with the 1-pin end of the reference voltage source U15; the 3 pin end of the reference voltage source U15 is connected with one end of the capacitor C28 in parallel and then connected with one end of the capacitor C27; the other end of the capacitor C27 is connected with the other end of the capacitor C28;
the 1 interface end of the analog-to-digital converter U11 is connected with one end of a resistor R20; the 2 interface end of the analog-to-digital converter U11 is connected with one end of a capacitor C21 in parallel and then connected with the other end of a resistor R13; the 3 interface end of the analog-to-digital converter U11 is connected with one end of a capacitor C24 in parallel and then connected with the other end of a resistor R17; the 6 interface end of the analog-to-digital converter U11 is connected with one end of a resistor R18 and one end of a capacitor C32; the other end of the resistor R18 is connected with the other end of the capacitor C32 in parallel and then is connected to the 2 interface end of the photoelectric coupler U9; the interface end 7 of the analog-to-digital converter U11 is connected with one end of a resistor R14, and the other end of the resistor R14 is connected with the interface end 5 of the photoelectric coupler U7;
the 1 interface end of the photoelectric coupler U7 is connected with one end of the capacitor C20, the 1 interface end of the photoelectric coupler U9 and one end of the capacitor C23 in parallel and then connected with the 1 port end of the photoelectric coupler U12; the 2 interface end of the photoelectric coupler U7 is connected with the other end of the capacitor C20 and the other end of the capacitor C23 in parallel and then connected with the 3 port end of the photoelectric coupler U12; the 3 interface end of the photoelectric coupler U7 is connected with one end of the resistor R12 in parallel and then connected with one end of the capacitor C22, and the other end of the capacitor C22 is connected with the other end of the resistor R12;
the 3 interface end of the photoelectric coupler U9 is connected with one end of a capacitor C34, and the other end of the capacitor C34 is grounded; the 5 interface end of the photoelectric coupler U9 is grounded; the 1 interface end of the photoelectric coupler U12 is connected with the other end of the resistor R2O; the 4 interface end of the photoelectric coupler U12 is connected with one end of a resistor R19 and one end of a capacitor C47; the other end of the resistor R19 is connected to the other end of the capacitor C47.
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