CN220985650U - Signal acquisition circuit and signal acquisition equipment - Google Patents
Signal acquisition circuit and signal acquisition equipment Download PDFInfo
- Publication number
- CN220985650U CN220985650U CN202323079880.XU CN202323079880U CN220985650U CN 220985650 U CN220985650 U CN 220985650U CN 202323079880 U CN202323079880 U CN 202323079880U CN 220985650 U CN220985650 U CN 220985650U
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- isolation
- resistor
- signal acquisition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002955 isolation Methods 0.000 claims abstract description 112
- 238000005070 sampling Methods 0.000 claims abstract description 52
- 238000001914 filtration Methods 0.000 claims description 93
- 239000003990 capacitor Substances 0.000 claims description 27
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000005465 channeling Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 20
- 238000000034 method Methods 0.000 description 10
- 230000003321 amplification Effects 0.000 description 5
- 238000003199 nucleic acid amplification method Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Amplifiers (AREA)
Abstract
The utility model relates to the technical field of electronic control, in particular to a signal acquisition circuit and signal acquisition equipment, wherein the signal acquisition circuit comprises a sampling amplifying circuit and a power isolation circuit, the sampling amplifying circuit amplifies a sampling signal, a power isolation chip of the power isolation circuit isolates a power signal input to the sampling amplifying circuit, interference in the power signal is filtered, electromagnetic interference and surge voltage of a power supply are prevented from influencing the circuit, normal operation of the circuit is ensured, stability and reliability of the signal are improved, potential difference and current channeling between equipment can be avoided, safety of the equipment and related personnel is ensured, and electric shock protection capability is stronger.
Description
Technical Field
The utility model relates to the technical field of electronic control, in particular to a signal acquisition circuit and signal acquisition equipment.
Background
Medical equipment can be divided into body insulating equipment, heart insulating equipment and double insulating equipment according to the level of electric shock protection, and body insulating equipment is the electric shock protection of minimum level, and heart insulating equipment is the intermediate level protection level, and double insulating equipment is the electric shock protection of highest level.
In order to meet the requirement of electric shock protection, the heart insulation device needs to isolate signals collected by the sensor or circuits related to the signals from the device main body, in the prior art, the circuits related to the signals are isolated as a whole, and potential difference and electromagnetic interference possibly exist in the circuits due to the isolation mode, so that the signals are unstable and have large errors, and even a human body is subjected to electric shock danger.
Disclosure of utility model
The embodiment of the utility model provides a signal acquisition circuit and signal acquisition equipment, which are used for solving the problems of unstable signals, large errors and even electric shock hazard of human bodies caused by isolating the whole circuit in the prior art.
In a first aspect, the present utility model provides a signal acquisition circuit comprising: the sampling amplifying circuit and the power isolation circuit are characterized in that the input end of the sampling amplifying circuit is used for inputting an acquisition signal, and the output end of the sampling amplifying circuit is used for outputting an amplified signal of the acquisition signal;
The power isolation circuit is characterized in that a power isolation chip is arranged in the power isolation circuit in series, the input end of the power isolation chip is used for being connected with a first power supply, the output end of the power isolation chip is used for being connected with the power end of the sampling amplifying circuit, and the power isolation circuit is used for isolating a first power supply signal of the first power supply.
In one embodiment, the power isolation circuit further comprises: the input end of the input power supply filtering branch is connected with the first power supply, the output end of the input power supply filtering branch is connected with the input end of the power supply isolation chip, the output end of the power supply isolation chip is connected with the input end of the output power supply filtering branch, and the output end of the output power supply filtering branch is connected with the power supply end of the sampling amplifying circuit;
The input power supply filtering branch circuit is used for filtering a first power supply signal of the first power supply; the output power supply filtering branch circuit is used for filtering signals output by the power supply isolation chip.
In one embodiment, the signal acquisition circuit further comprises: a signal isolation circuit, the signal isolation circuit comprising: the device comprises an isolation linear optical coupler, a first signal filtering branch and a second signal filtering branch, wherein a first input end of the first signal filtering branch is connected with an output end of the sampling amplifying circuit, an output end of the first signal filtering branch is connected with an input end of the isolation linear optical coupler, and a feedback end of the isolation linear optical coupler is connected with a second input end of the first signal filtering branch;
The first signal filtering branch is used for filtering the amplified signal and inputting the filtered signal to the isolation linear optocoupler, and adjusting the signal input to the isolation linear optocoupler according to the signal of the second input end;
the output end of the isolation linear optocoupler is connected with the input end of the second signal filtering branch, and the output end of the second signal filtering branch is used for outputting an amplified signal after isolation.
In one embodiment, the first signal filtering branch includes: a first comparator, a first resistor, a second resistor, a third resistor, and a first capacitor, wherein:
One end of the first resistor is connected with the output end of the sampling amplifying circuit, the other end of the first resistor is connected with one end of the first capacitor, the other end of the first capacitor is grounded, one end of the first capacitor is connected with one end of the second resistor, the other end of the second resistor is connected with the in-phase input end of the first comparator, the output end of the first comparator is connected with one end of the third resistor, the other end of the third resistor is connected with the input positive end of the isolation linear optocoupler, the input negative electrode of the isolation linear optocoupler is grounded, the inverting input end of the first comparator is connected with the feedback positive end of the isolation linear optocoupler, and the in-phase input end of the first comparator is connected with the feedback negative end of the isolation linear optocoupler.
In one embodiment, the second signal filtering branch includes: a second comparator, a fourth resistor, a fifth resistor, and a second capacitor, wherein:
The non-inverting input end of the second comparator is connected with the output positive end of the isolation linear optocoupler, the inverting input end of the second comparator is connected with the output negative end of the isolation linear optocoupler, the output end of the second comparator is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the inverting input end of the second comparator, the output end of the second comparator is connected with one end of the fifth resistor, one end of the fifth resistor is connected with one end of the second capacitor, the other end of the second capacitor is grounded, and the other end of the fifth resistor is used for outputting an amplified signal after isolation.
In one embodiment, the signal acquisition circuit further comprises: the device comprises a sampling amplifying circuit, a first electrostatic protection diode and a second electrostatic protection diode, wherein one end of the first electrostatic protection diode is connected with the positive electrode of the input end of the sampling amplifying circuit, one end of the second electrostatic protection diode is connected with the negative electrode of the input end of the sampling amplifying circuit, the other end of the first electrostatic protection diode is grounded, and the other end of the second electrostatic protection diode is grounded.
In one embodiment, the signal acquisition circuit further comprises: the input end of the first filter circuit is used for inputting the acquisition signal, the output end of the first filter circuit is connected with the input end of the sampling amplifying circuit, and the first filter circuit is used for filtering the acquisition signal.
In one embodiment, the signal acquisition circuit further comprises: the input end of the low-pass filtering branch is connected with the output end of the second signal filtering branch, and the output end of the low-pass filtering branch is used for outputting an amplified signal subjected to low-pass filtering.
In a second aspect, this embodiment provides a signal acquisition device, where the signal acquisition device includes the processor and N signal acquisition circuits as described in the first aspect and modifications thereof, N is an integer greater than 1, and output ends of the N signal acquisition circuits are connected to the processor.
In an embodiment, the signal acquisition device further comprises: and the input ends of the N sensors are connected with the corresponding sensors.
Compared with the prior art, the embodiment of the utility model has the beneficial effects that:
The signal acquisition circuit comprises a sampling amplifying circuit and a power isolation circuit, wherein the sampling amplifying circuit amplifies a sampling signal, the power isolation chip of the power isolation circuit isolates the power signal input to the sampling amplifying circuit, interference in the power signal is filtered, the influence of electromagnetic interference and surge voltage of a power supply on the circuit is prevented, the normal operation of the circuit is ensured, the stability and the reliability of the signal are improved, meanwhile, the mutual channeling of potential difference and current between equipment can be avoided, the safety of the equipment and related personnel is ensured, and the electric shock protection capability is stronger.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a signal acquisition circuit according to an embodiment of the present utility model;
fig. 2 is a schematic block diagram of a signal acquisition circuit according to an embodiment of the present utility model;
fig. 3 is a schematic block diagram of a signal acquisition circuit according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram illustrating a circuit connection between a first signal filtering branch and an isolated linear optocoupler according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram illustrating a circuit connection between a second signal filtering branch and an isolated linear optocoupler according to an embodiment of the present utility model;
FIG. 6 is a schematic block diagram of a signal acquisition circuit according to an embodiment of the present utility model;
fig. 7 is a schematic block diagram of a signal acquisition circuit according to an embodiment of the utility model;
FIG. 8 is a schematic block diagram of a signal acquisition circuit according to an embodiment of the present utility model;
Fig. 9 is a schematic block diagram of a signal acquisition device according to an embodiment of the present utility model;
fig. 10 is a schematic block diagram of a signal acquisition device according to an embodiment of the present utility model;
Wherein, 1, a sampling amplifying circuit, 2, a power supply isolating circuit, 3, a signal isolating circuit, 4, a first electrostatic protection diode, 5, a first electrostatic protection diode, 6, a first filter circuit, 7, a low-pass filter branch, 8, a processor, the device comprises 9, N signal acquisition circuits, 10, N sensors, 21, a power isolation chip, 22, an input power filtering branch, 23, an output power filtering branch, 31, an isolation linear optocoupler, 32, a first signal filtering branch, 33 and a second signal filtering branch.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.
Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In one embodiment, as shown in fig. 1, a schematic block diagram of a signal acquisition circuit is provided, including: the sampling amplifying circuit 1 and the power isolation circuit 2, wherein the input end of the sampling amplifying circuit 1 is used for inputting a collection signal, and the output end of the sampling amplifying circuit 1 is used for outputting an amplified signal of the collection signal;
The power isolation circuit 1 is provided with a power isolation chip 21 in series, an input end of the power isolation chip 21 is used for being connected with a first power supply, an output end of the power isolation chip 21 is used for being connected with a power end of the sampling amplification circuit 1, and the power isolation circuit 2 is used for isolating a first power supply signal of the first power supply.
The power isolation chip 21 may be a programmable precision voltage reference chip such as TL431; the power isolation chip 21 may also be a PWM control chip, such as UC3842; the power isolation chip 21 may also be an isolated converter chip, such as LT8300; the power isolation chip 21 may also be a high-speed isolation type digital isolator chip, such as ADUM3190; the power isolation chip 21 may also be a power management chip, such as H0505, and preferably, in this embodiment, H0505 is used as the power isolation chip 21, where H0505 has a wide input voltage range, and can adapt to a wider output voltage range while ensuring electrical isolation between input and output.
The sampling amplifying circuit 1 can be provided with an operational amplifier to amplify the acquired signals, the sampling amplifying circuit 1 can also be provided with a switching tube to amplify the acquired signals, the sampling amplifying circuit 1 can also be provided with an instrument amplifier to amplify the acquired signals, and preferably, the instrument amplifier is used for amplifying the acquired signals.
The working process of the signal acquisition circuit is as follows: the first power signal of the first power supply flows to the power end of the instrument amplifier after passing through the H0505 chip, so that the power is supplied to the instrument amplifier, and the H0505 power supply can be isolated and can also be used for rectifying and filtering the first power signal to provide a stable power signal for the instrument amplifier.
The signal acquisition circuit of this embodiment, including sampling amplification circuit 1 and power isolation circuit 2, sampling amplification circuit 1 is to sampling signal's is amplified, keep apart the power signal who inputs to sampling amplification circuit 1 through the power isolation chip 21 of power isolation circuit 2, interference among the filtering power signal prevents that electromagnetic interference and surge voltage of power from influencing the circuit, guarantee the normal work of circuit, improve the stability and the reliability of signal, potential difference and the electric current each other scurrying between the equipment can be avoided simultaneously, the safety of equipment and relevant personnel has been ensured, electric shock protective capability is stronger.
In an embodiment, as shown in fig. 2, a schematic block diagram of a signal acquisition circuit is provided, and on the basis of the signal acquisition circuit shown in fig. 1, the power isolation circuit 2 further includes: the input power supply filter branch 22 and the output power supply filter branch 23, the input end of the input power supply filter branch 22 is connected with the first power supply, the output end of the input power supply filter branch 22 is connected with the input end of the power supply isolation chip 21, the output end of the power supply isolation chip 21 is connected with the input end of the output power supply filter branch 23, and the output end of the output power supply filter branch 23 is connected with the power supply end of the sampling amplifying circuit 1.
The input power filtering branch 22 is configured to filter a first power signal of the first power; the output power filtering branch 23 is used for filtering the signal output by the power isolation chip 21.
The input power supply filtering branch 22 and the output power supply filtering branch 23 can filter the power supply signal by adopting a capacitor and a resistor, and can filter the power supply signal by adopting an inductor and a resistor.
The working process of the signal acquisition circuit is as follows: the first power signal flows to the power isolation chip 21 after being filtered by the input power filtering branch 22, the power isolation chip 21 isolates and filters the power signal and then transmits the power signal to the output power filtering branch 23, and the output power filtering branch 23 filters the signal and provides the power signal for the sampling amplifying circuit 1.
The signal acquisition circuit of this embodiment, through setting up input power filter branch road 22, carry out the filtration to first power signal earlier and then utilize power isolation chip 21 to keep apart the signal, set up output power filter branch road 23 and carry out the filtration to the signal of power isolation chip 21 output, can filter the ripple noise in the power signal, make power signal smoother, more stable, avoid forming electromagnetic interference.
In an embodiment, as shown in fig. 3, a schematic block diagram of a signal acquisition circuit is provided, and the signal acquisition circuit further includes, based on the circuit shown in fig. 2: a signal isolation circuit 3, the signal isolation circuit 3 comprising: the first input end of the first signal filtering branch 32 is connected with the output end of the sampling amplifying circuit 1, the output end of the first signal filtering branch 32 is connected with the input end of the isolation linear optical coupler 31, and the feedback end of the isolation linear optical coupler 31 is connected with the second input end of the first signal filtering branch 32;
The first signal filtering branch 32 is configured to filter the amplified signal and input the filtered signal to the isolated linear optocoupler 31, and adjust a signal input to the isolated linear optocoupler 31 according to a signal at the second input end;
The output end of the isolation linear optocoupler 31 is connected to the input end of the second signal filtering branch 33, and the output end of the second signal filtering branch 33 is used for outputting the amplified signal after isolation.
The isolation linear optocoupler 31 may be any signal isolation linear optocoupler 31, such as LP632, TLP532, PC614, PC714, PS2031, and HCNR200, and in other embodiments, a feedback-free linear optocoupler may be provided to isolate a signal, such as PC817 and PC111, and preferably, the isolation linear optocoupler 31 of this embodiment uses HCNR200.
The working process of the signal acquisition circuit is as follows: the amplified signal output by the sampling amplifying circuit 1 flows to the input end of the HCNR200 after being filtered by the first signal filtering branch 32, the light emitting diode in the HCNR200 is conducted, infrared light is emitted to irradiate on the feedback diode and the output diode, the feedback diode converts the optical signal into an electric signal and outputs the electric signal to the first signal filtering branch 32 as a feedback signal, the feedback signal adjusts and compensates the signal input to the light emitting diode, the output diode converts the optical signal into the electric signal and outputs the electric signal, the signal output by the output diode is in linear proportion with the signal flowing in by the light emitting diode, and the signal output by the output diode is filtered by the second signal filtering branch 33 and then transmitted to the post-stage circuit.
The signal acquisition circuit of this embodiment utilizes first signal filter circuit to carry out the filtering to the amplified signal, can filter the noise interference in the amplified signal, ensures the quality and the stability of signal, utilizes the isolation linear opto-coupler 31 to carry out the transmission to second signal filter circuit after keeping apart the signal after the filtering, keeps apart the linear opto-coupler 31 and keeps apart the potential difference in equipment or the circuit that can be further to the amplified signal, protection equipment and personal safety can prevent simultaneously that external interference and surge voltage from causing the influence to the circuit, improves the stability and the reliability of circuit.
In an embodiment, as shown in fig. 4, a schematic circuit connection diagram of the first signal filtering branch and the isolated linear optocoupler is provided, and on the basis of the signal acquisition circuit shown in fig. 3, the first signal filtering branch 32 includes: the first comparator U1, the first resistor R1, the second resistor R2, the third resistor R3, and the first capacitor C1, wherein:
One end of the first resistor R1 is connected to the output end of the sampling amplifying circuit 1, the other end of the first resistor R1 is connected to one end of the first capacitor C1, the other end of the first capacitor C1 is grounded, one end of the first capacitor C1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the non-inverting input end of the first comparator U1, the output end of the first comparator U1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the input positive end of the isolation linear optocoupler 31, the input negative end of the isolation linear optocoupler 31 is grounded, the inverting input end of the first comparator U1 is connected to the feedback positive end of the isolation linear optocoupler 31, and the non-inverting input end of the first comparator U1 is connected to the feedback negative end of the isolation linear optocoupler 31.
The working process of the signal acquisition circuit is as follows: the amplified signal flows to the first capacitor C1 through the first resistor R1, the amplified signal is divided and filtered by the first resistor R1 and the first capacitor C1, then flows to the in-phase input end of the first comparator U1 through the second resistor R2, the output signal of the comparator flows to the input end of the isolation linear optocoupler 31 through the third resistor R3, the input end of the isolation linear optocoupler 31 is conducted, the feedback end of the isolation linear optocoupler 31 outputs a feedback signal to the input end of the first comparator U1, and the first comparator U1 adjusts the signal input to the isolation linear optocoupler 31 according to the feedback signal.
In the signal acquisition circuit of this embodiment, the first comparator U1 performs common-mode filtering on the amplified signal and then flows to the isolation linear optocoupler 31, and by properly adjusting the resistances of the second resistor R2 and the fourth resistor, the signal output by the amplified signal and the signal output by the isolation linear optocoupler 31 can be in a linear relationship of 1:1, so that the accuracy of data can be ensured, the amplified signal can be isolated, the potential difference can be eliminated, and the safety of equipment and related personnel can be ensured.
In an embodiment, as shown in fig. 5, a schematic circuit connection diagram of the second signal filtering branch 33 and the isolated linear optocoupler 31 is provided, and on the basis of the signal acquisition circuit shown in fig. 3, the second signal filtering branch 33 includes: a second comparator U2, a fourth resistor R4, a fifth resistor R5 and a second capacitor C2, wherein:
The non-inverting input end of the second comparator U2 is connected to the output positive end of the isolation linear optocoupler 31, the inverting input end of the second comparator U2 is connected to the output negative end of the isolation linear optocoupler 31, the output end of the second comparator U2 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the inverting input end of the second comparator U2, the output end of the second comparator U2 is connected to one end of the fifth resistor R5, one end of the fifth resistor R5 is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is grounded, and the other end of the fifth resistor R5 is used for outputting an amplified signal after isolation.
The working process of the signal acquisition circuit is as follows: the signal output by the output end of the isolation linear optocoupler 31 flows to the output end of the comparator from the input end of the comparator, the signal of the output end of the comparator flows to the inverting input end of the comparator through the fourth resistor R4 to form negative feedback, the output signal is weakened, and the output signal flows to the rear-stage circuit after being divided by the fifth resistor R5 and the second capacitor C2.
In the signal acquisition circuit of the embodiment, the output end and the inverting input end of the second comparator U2 are arranged to form negative feedback, so that the error of the signal is reduced, the working state of the circuit is stabilized, and the precision and stability of the signal are improved.
In an embodiment, as shown in fig. 6, a schematic block diagram of a signal acquisition circuit is provided, and on the basis of the signal acquisition circuit shown in fig. 1, the signal acquisition circuit further includes: the sampling amplifying circuit comprises a first electrostatic protection diode 4 and a second electrostatic protection diode 5, wherein one end of the first electrostatic protection diode 4 is connected with the positive electrode of the input end of the sampling amplifying circuit 1, one end of the second electrostatic protection diode 5 is connected with the negative electrode of the input end of the sampling amplifying circuit 1, the other end of the first electrostatic protection diode 4 is grounded, and the other end of the second electrostatic protection diode 5 is grounded.
The working process of the signal acquisition circuit is as follows: the electrostatic energy is introduced into the ground plane through the first electrostatic protection diode 4D1 and the second electrostatic protection diode 5D 2.
As other embodiments, capacitance may also be used for electrostatic protection.
The signal acquisition circuit of this embodiment adopts first static protection diode 4, second static protection diode 5 to carry out the static protection to the acquisition signal, can avoid static to lead to the fact the impact to the signal to influence, ensures circuit work, improves the reliability of circuit.
In an embodiment, as shown in fig. 7, a schematic block diagram of a signal acquisition circuit is provided, and on the basis of the signal acquisition circuit shown in fig. 1, the signal acquisition circuit further includes: the input end of the first filter circuit 6 is used for inputting the acquisition signal, the output end of the first filter circuit 6 is connected with the input end of the sampling amplifying circuit 1, and the first filter circuit 6 is used for filtering the acquisition signal.
The first filter circuit 6 may set a resistor and an inductor to filter the collected signal, or may set a resistor, a capacitor and an inductor to filter the collected signal. A filter may also be provided to filter the acquired signal.
The working process of the signal acquisition circuit is as follows: the acquired signal is filtered by the first filter circuit 6 and then flows to the sampling amplifying circuit 1 for amplification.
In the signal acquisition circuit of the embodiment, the first filter circuit 6 is arranged to filter out common mode noise in a certain frequency band in the signal, so that the quality of the signal is relatively high, and the product requirements of some high precision are met.
In an embodiment, as shown in fig. 8, a schematic block diagram of a signal acquisition circuit is provided, and on the basis of the signal acquisition circuit shown in fig. 3, the signal acquisition circuit further includes: and the input end of the low-pass filtering branch 7 is connected with the output end of the second signal filtering branch 33, and the output end of the low-pass filtering branch 7 is used for outputting an amplified signal subjected to low-pass filtering.
Preferably, a comparator is arranged in the low-pass filtering branch 7 to perform low-pass filtering, and the output end and the forward input end of the comparator are connected through a capacitor to form positive feedback so as to protect the comparator.
The working process of the signal acquisition circuit is as follows: the signal output by the second signal filtering branch 33 is filtered by the low-pass filtering branch 7 and flows to the post-stage circuit.
The signal acquisition circuit of the embodiment can filter noise and interference in the amplified signal through the low-pass filtering branch 7, so as to ensure the quality of the signal.
In an embodiment, as shown in fig. 9, a schematic block diagram of a signal acquisition device is provided, where the signal acquisition device includes a processor 8 and N signal acquisition circuits mentioned in any of the foregoing embodiments, N is an integer greater than 1, and output ends of the N signal acquisition circuits are connected to the processor 8.
The processor 8 in this embodiment may be any processor 8, such as MCU, MPU, DSP, preferably, an MCU is used as the processor 8, and a diode may be disposed between the processor 8 and the signal acquisition circuit to protect the processor 8.
The working process of the signal acquisition equipment is as follows: each acquisition signal flows to the processor 8 through each signal acquisition circuit, and the processor 8 performs AD acquisition conversion on the signals output by the signal acquisition circuits to complete signal acquisition.
The signal acquisition equipment of this embodiment sets up the signal that the treater 8 carries out AD conversion to the signal that gathers, the processing of digital system of being convenient for, storage and analysis to realize more accurate control and measurement, the signal acquisition circuit that the equipment adopted above-mentioned arbitrary embodiment to mention, the interference in the filtering power signal prevents that electromagnetic interference and the surge voltage of power and acquisition signal from producing the influence to the circuit, can avoid the inside potential difference of circuit and electric current to scurry each other simultaneously, ensure the safety of equipment and relevant personnel.
In an embodiment, as shown in fig. 10, a schematic block diagram of a signal acquisition device is provided, and on the basis of the signal acquisition device shown in fig. 9, the signal acquisition device further includes: the input ends of the N sensors are connected with the corresponding sensors.
The working process of the signal acquisition equipment is as follows: the collected signals are respectively transmitted to the signal collecting circuits by the sensors, and the collected signals are processed by the signal collecting circuits and then flow to the processor 8.
The signal acquisition equipment of this embodiment not only is kept apart between application part and the equipment, and each application part also keeps apart each other, mutually noninterferes, avoids forming potential difference and electric current and scurries each other, has further ensured the safety of equipment and relevant personnel, and electric shock protective capability is stronger.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (10)
1. A signal acquisition circuit, comprising: the sampling amplifying circuit and the power isolation circuit are characterized in that the input end of the sampling amplifying circuit is used for inputting an acquisition signal, and the output end of the sampling amplifying circuit is used for outputting an amplified signal of the acquisition signal;
The power isolation circuit is characterized in that a power isolation chip is arranged in the power isolation circuit in series, the input end of the power isolation chip is used for being connected with a first power supply, the output end of the power isolation chip is used for being connected with the power end of the sampling amplifying circuit, and the power isolation circuit is used for isolating a first power supply signal of the first power supply.
2. The signal acquisition circuit of claim 1, wherein the power isolation circuit further comprises: the input end of the input power supply filtering branch is connected with the first power supply, the output end of the input power supply filtering branch is connected with the input end of the power supply isolation chip, the output end of the power supply isolation chip is connected with the input end of the output power supply filtering branch, and the output end of the output power supply filtering branch is connected with the power supply end of the sampling amplifying circuit;
The input power supply filtering branch circuit is used for filtering a first power supply signal of the first power supply; the output power supply filtering branch circuit is used for filtering signals output by the power supply isolation chip.
3. The signal acquisition circuit of claim 1, wherein the signal acquisition circuit further comprises: a signal isolation circuit, the signal isolation circuit comprising: the device comprises an isolation linear optical coupler, a first signal filtering branch and a second signal filtering branch, wherein a first input end of the first signal filtering branch is connected with an output end of the sampling amplifying circuit, an output end of the first signal filtering branch is connected with an input end of the isolation linear optical coupler, and a feedback end of the isolation linear optical coupler is connected with a second input end of the first signal filtering branch;
The first signal filtering branch is used for filtering the amplified signal and inputting the filtered signal to the isolation linear optocoupler, and adjusting the signal input to the isolation linear optocoupler according to the signal of the second input end;
the output end of the isolation linear optocoupler is connected with the input end of the second signal filtering branch, and the output end of the second signal filtering branch is used for outputting an amplified signal after isolation.
4. A signal acquisition circuit as claimed in claim 3, wherein the first signal filtering branch comprises: a first comparator, a first resistor, a second resistor, a third resistor, and a first capacitor, wherein:
One end of the first resistor is connected with the output end of the sampling amplifying circuit, the other end of the first resistor is connected with one end of the first capacitor, the other end of the first capacitor is grounded, one end of the first capacitor is connected with one end of the second resistor, the other end of the second resistor is connected with the in-phase input end of the first comparator, the output end of the first comparator is connected with one end of the third resistor, the other end of the third resistor is connected with the input positive end of the isolation linear optocoupler, the input negative electrode of the isolation linear optocoupler is grounded, the inverting input end of the first comparator is connected with the feedback positive end of the isolation linear optocoupler, and the in-phase input end of the first comparator is connected with the feedback negative end of the isolation linear optocoupler.
5. A signal acquisition circuit as claimed in claim 3, wherein the second signal filtering branch comprises: a second comparator, a fourth resistor, a fifth resistor, and a second capacitor, wherein:
The non-inverting input end of the second comparator is connected with the output positive end of the isolation linear optocoupler, the inverting input end of the second comparator is connected with the output negative end of the isolation linear optocoupler, the output end of the second comparator is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with the inverting input end of the second comparator, the output end of the second comparator is connected with one end of the fifth resistor, one end of the fifth resistor is connected with one end of the second capacitor, the other end of the second capacitor is grounded, and the other end of the fifth resistor is used for outputting an amplified signal after isolation.
6. The signal acquisition circuit of claim 1, wherein the signal acquisition circuit further comprises: the device comprises a sampling amplifying circuit, a first electrostatic protection diode and a second electrostatic protection diode, wherein one end of the first electrostatic protection diode is connected with the positive electrode of the input end of the sampling amplifying circuit, one end of the second electrostatic protection diode is connected with the negative electrode of the input end of the sampling amplifying circuit, the other end of the first electrostatic protection diode is grounded, and the other end of the second electrostatic protection diode is grounded.
7. The signal acquisition circuit of claim 1, wherein the signal acquisition circuit further comprises: the input end of the first filter circuit is used for inputting the acquisition signal, the output end of the first filter circuit is connected with the input end of the sampling amplifying circuit, and the first filter circuit is used for filtering the acquisition signal.
8. The signal acquisition circuit of claim 3, wherein the signal acquisition circuit further comprises: the input end of the low-pass filtering branch is connected with the output end of the second signal filtering branch, and the output end of the low-pass filtering branch is used for outputting an amplified signal subjected to low-pass filtering.
9. A signal acquisition device, characterized in that the signal acquisition device comprises a processor and N signal acquisition circuits according to any one of claims 1-8, N being an integer greater than 1, the output ends of the N signal acquisition circuits being connected to the processor.
10. The signal acquisition device of claim 9, wherein the signal acquisition device further comprises: and the input ends of the N sensors are connected with the corresponding sensors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323079880.XU CN220985650U (en) | 2023-11-13 | 2023-11-13 | Signal acquisition circuit and signal acquisition equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323079880.XU CN220985650U (en) | 2023-11-13 | 2023-11-13 | Signal acquisition circuit and signal acquisition equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220985650U true CN220985650U (en) | 2024-05-17 |
Family
ID=91060875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323079880.XU Active CN220985650U (en) | 2023-11-13 | 2023-11-13 | Signal acquisition circuit and signal acquisition equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220985650U (en) |
-
2023
- 2023-11-13 CN CN202323079880.XU patent/CN220985650U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102908137B (en) | Single-channel ECG (Electrocardiogram) collection chip | |
| CN114681044A (en) | Temperature detection device and radio frequency ablation system | |
| CN114533087B (en) | Method and system for eliminating direct current offset between electrodes based on chopping technology | |
| CN110840453A (en) | Circuit for collecting electroencephalogram signals and anti-interference method | |
| CN220985650U (en) | Signal acquisition circuit and signal acquisition equipment | |
| CN207336630U (en) | A kind of detection device of each branch current of High voltage series capacitor device compensation device | |
| CN209070002U (en) | A kind of high-precision bidirectional DC voltage isolation Acquisition Circuit | |
| CN209894959U (en) | High-common-mode-interference-resistance small-signal isolation sampling conditioning circuit of electronic transformer | |
| CN106655826A (en) | Magnetic isolation feedback circuit and method | |
| Li et al. | Analysis and implement of ECG front-end signal processing circuit | |
| CN202794285U (en) | Isolation processing circuit for small analog alternating current (AC) or direct current (DC) signals | |
| CN215778577U (en) | Temperature detection device and radio frequency ablation system | |
| CN213821443U (en) | Analog amplification circuit based on high-frequency EEG signal | |
| CN215003927U (en) | Noise signal sensing device based on intelligent distribution transformation visual management and control platform | |
| CN106788383B (en) | Weak signal conditioning circuit of non-electric quantity sensor | |
| CN210986052U (en) | Signal processing system for inhibiting signal interference of motor vehicle detection device | |
| CN108418563A (en) | A kind of feedback control circuit of power amplifier | |
| CN110882467A (en) | Sleeping instrument | |
| CN203122375U (en) | Non-invasive blood pressure anti-interference circuit | |
| CN210514514U (en) | Small signal acquisition circuit applied to power distribution terminal | |
| CN212327147U (en) | Sleeping instrument | |
| CN202886479U (en) | Insulation resistance-to-ground sampling signal processing circuit for photovoltaic grid-connection system | |
| CN215687915U (en) | High-precision ECG signal measuring device | |
| CN201847675U (en) | Pulse signal processing circuit based on PVDF (polyvinylidene fluoride) sensor | |
| CN216356681U (en) | ADC module based on two-stage amplifying circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |