CN209281373U - Direct current biasing for human body Collection equipment eliminates circuit - Google Patents
Direct current biasing for human body Collection equipment eliminates circuit Download PDFInfo
- Publication number
- CN209281373U CN209281373U CN201821864805.0U CN201821864805U CN209281373U CN 209281373 U CN209281373 U CN 209281373U CN 201821864805 U CN201821864805 U CN 201821864805U CN 209281373 U CN209281373 U CN 209281373U
- Authority
- CN
- China
- Prior art keywords
- resistance
- relay
- capacitor
- human body
- operational amplifier
- 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
Landscapes
- Amplifiers (AREA)
Abstract
The utility model provides a kind of direct current biasing elimination circuit for human body Collection equipment, including low-pass filtering difference channel, mode selection circuit, operational amplifier, AD conversion unit and CPU element, input terminal recipient's sampler body signal of the low-pass filtering difference channel, the output end of the low-pass filtering difference channel connects the input terminal of the operational amplifier by the mode selection circuit, and the output end of the operational amplifier connects the CPU element by the AD conversion unit.The direct current biasing for being used for human body Collection equipment, which eliminates circuit, has the advantages that design science, practical, structure is simple, easy to use.
Description
Technical field
The utility model relates to a kind of direct current biasings for human body Collection equipment to eliminate circuit.
Background technique
Human body Collection such as body surface ecg, intracardiac signal, EEG signals etc., since order of magnitude very little needs operation to put
Big device amplifies processing, and amplifier can inherently generate certain direct current biasing, shadow of the sampled data due to direct current biasing
It rings, the problem of signal is not in baseline can be shown as on output display interface.This problem usually passes through high-pass filtering in practice
Device is eliminated, but due to the time constant that high-pass filter has its intrinsic, signal needs the regular hour that can just be pulled
To baseline position, High Pass Filter Cutoff Frequency is lower, and time constant will be bigger, to the timeliness shadow of product in actual use
Sound is very big.
In order to solve the above problems, people are seeking always a kind of ideal technical solution.
Summary of the invention
The purpose of this utility model is in view of the deficiencies of the prior art, to provide a kind of design science, practical, knot
Structure is simple, the direct current biasing easy to use for human body Collection equipment eliminates circuit.
To achieve the goals above, the technical scheme adopted by the utility model is a kind of be used for human body Collection
The direct current biasing of equipment eliminates circuit, including low-pass filtering difference channel, mode selection circuit, operational amplifier, analog-to-digital conversion
Unit and CPU element, input terminal recipient's sampler body signal of the low-pass filtering difference channel, the low-pass filtering differential electrical
The output end on road connects the input terminal of the operational amplifier, the output of the operational amplifier by the mode selection circuit
End connects the CPU element by the AD conversion unit.
Based on above-mentioned, the low-pass filtering difference channel includes clamp diode U1, clamp diode U2, resistance R1, electricity
Hindering R2, resistance R3, resistance R4, capacitor C1, capacitor C2, capacitor C3 and capacitor C4, the mode selection circuit includes relay K1
With relay K2, the CPU element controls the coil of the coil and the relay K2 that connect the relay K1 respectively；It is described
One end of resistance R2 connects the relay K1 by the resistance R1 recipient sampler body signal, the other end of the resistance R2
A moved end, the static side of the relay K1 connects an input terminal of the operational amplifier, one end of the resistance R2
It is grounded by the capacitor C1, the other end of the resistance R2 is grounded by the capacitor C2, and the other end of the resistance R2 is also
Pass through the clamp diode U1 connection power supply；One end of the resistance R4 passes through the resistance R3 recipient sampler body signal,
The other end of the resistance R4 connects a moved end of the relay K2, and the static side of the relay K2 connects the operation and puts
One end of another input terminal of big device, the resistance R4 is grounded by the capacitor C3, and the other end of the resistance R4 passes through
The capacitor C4 ground connection, the other end of the resistance R4 also pass through the clamp diode U2 connection power supply, the relay K1
Another moved end connect another moved end of the relay K2.
It further include electrode delamination detection circuit, a moved end of the relay K1 also passes through the resistance based on above-mentioned
A moved end of R5 connection power supply AVDD, the relay K2 also pass through resistance R6 connection power supply AVSS.
The utility model has substantive features and progress compared with the prior art, and specifically, the utility model passes through mould
Formula selection circuit switch sampling external input signal and DC bias signal, CPU element is according to the DC bias signal pair of sampling
External input signal is calibrated, and has the advantages that design science, practical, structure is simple, easy to use.
Detailed description of the invention
Fig. 1 is the structural schematic block diagram of the utility model.
Fig. 2 is the electrical block diagram of the utility model.
Specific embodiment
Below by specific embodiment, the technical solution of the utility model is described in further detail.
As depicted in figs. 1 and 2, a kind of direct current biasing for human body Collection equipment eliminates circuit, including low pass
Filter difference circuit, mode selection circuit, operational amplifier, AD conversion unit and CPU element, the low-pass filtering differential electrical
Input terminal recipient's sampler body signal on road, the output end of the low-pass filtering difference channel are connected by the mode selection circuit
The input terminal of the operational amplifier is connect, the output end of the operational amplifier passes through described in AD conversion unit connection
CPU element.
In use, by mode selection circuit switch sampling mode, first switch short circuit mode with sampled operational amplifier from
The DC offset voltage of body, is stored into CPU element after analog-to-digital conversion.Switch external signal input sample mode again, receives
Human body sampled signal, the human body sampled signal received is removed stored direct current biasing component by CPU element can be obtained school
Quasi- human body sampled signal, CPU element will calibrate the digital data transmission after conversion to display equipment, display equipment in practice
Human body sampled signal export display.
Specifically, the low-pass filtering difference channel includes clamp diode U1, clamp diode U2, resistance R1, resistance
R2, resistance R3, resistance R4, capacitor C1, capacitor C2, capacitor C3 and capacitor C4, the mode selection circuit include relay K1 and
Relay K2, the CPU element control the coil of the coil and the relay K2 that connect the relay K1 respectively；The electricity
One end of R2 is hindered by the resistance R1 recipient sampler body signal, and the other end of the resistance R2 connects the relay K1's
One moved end, the static side of the relay K1 connect an input terminal of the operational amplifier, and one end of the resistance R2 is logical
The capacitor C1 ground connection is crossed, the other end of the resistance R2 is grounded by the capacitor C2, and the other end of the resistance R2 is also logical
Cross the clamp diode U1 connection power supply；One end of the resistance R4 passes through the resistance R3 recipient sampler body signal, institute
The other end for stating resistance R4 connects a moved end of the relay K2, and the static side of the relay K2 connects the operation amplifier
One end of another input terminal of device, the resistance R4 is grounded by the capacitor C3, and the other end of the resistance R4 passes through institute
Capacitor C4 ground connection is stated, the other end of the resistance R4 also passes through the clamp diode U2 connection power supply, the relay K1's
Another moved end connects another moved end of the relay K2.First by the connection of another moved end of the relay K1 it is described after
Another moved end of electric appliance K2, operational amplifier are shorted, and the DC offset voltage of operational amplifier itself are acquired, through analog-to-digital conversion
After be stored into CPU element.Again by a moved end of the static side connection relay K1 of relay K1, the static side of relay K2 is connected
A moved end of contact relay K2 leads to by low-pass filtering recipient's sampler body signal to filter out the interference signal except frequency band
It crosses difference type input and is transmitted to CPU element, the people that CPU element will receive after operational amplifier amplifies, then through analog-to-digital conversion
Sampler body signal, which removes stored direct current biasing component, can be obtained the human body sampled signal of calibration.In the present embodiment, CUP is mono-
Member is general single-chip microcontroller, such as 51 single-chip microcontrollers series.Clamp diode model BAV199.In other embodiments, relay
It can be replaced analog switch.
Preferably, eliminating circuit for the direct current biasing of human body Collection equipment further includes electrode delamination detection electricity
Road, a moved end of the relay K1 also pass through the resistance R5 connection power supply AVDD, a moved end of the relay K2
Also pass through resistance R6 connection power supply AVSS.AVDD is positive voltage, and AVSS is negative voltage, resistance R1 and/or resistance when electrode delamination
The input terminal of R2 is hanging, through ADC sampled components compared with preset threshold, judges whether electrode falls off.It is de- in electrode in practice
It is a constant as the numerical value for the direct current biasing caused by detection part that falls off, by the constant in the case where falling detection circuit determination
It is stored into CPU element, the human body sampled signal received is removed stored amplifier direct current biasing component and taken off by CPU element
Falling detection direct current biasing component can be obtained the human body sampled signal of calibration.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the utility model rather than limit it
System；Although the utility model has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should
Understand: specific implementation of the utility model can still be modified or is equally replaced to some technical characteristics
It changes；Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model
In range.
Claims (3)
1. a kind of direct current biasing for human body Collection equipment eliminates circuit, it is characterised in that: poor including low-pass filtering
Parallel circuit, mode selection circuit, operational amplifier, AD conversion unit and CPU element, the low-pass filtering difference channel it is defeated
Enter end and receive human body sampled signal, the output end of the low-pass filtering difference channel passes through described in mode selection circuit connection
The output end of the input terminal of operational amplifier, the operational amplifier connects the CPU element by the AD conversion unit.
2. the direct current biasing according to claim 1 for human body Collection equipment eliminates circuit, it is characterised in that:
The low-pass filtering difference channel includes clamp diode U1, clamp diode U2, resistance R1, resistance R2, resistance R3, resistance
R4, capacitor C1, capacitor C2, capacitor C3 and capacitor C4, the mode selection circuit includes relay K1 and relay K2, described
CPU element controls the coil of the coil and the relay K2 that connect the relay K1 respectively；One end of the resistance R2 is logical
The resistance R1 recipient sampler body signal is crossed, the other end of the resistance R2 connects a moved end of the relay K1, institute
The static side for stating relay K1 connects an input terminal of the operational amplifier, and one end of the resistance R2 passes through the capacitor C1
The other end of ground connection, the resistance R2 is grounded by the capacitor C2, and the other end of the resistance R2 also passes through the clamper two
Pole pipe U1 connection power supply；By the resistance R3 recipient sampler body signal, the resistance R4's is another for one end of the resistance R4
One end connects a moved end of the relay K2, the static side of the relay K2 connect the operational amplifier another is defeated
Entering end, one end of the resistance R4 is grounded by the capacitor C3, and the other end of the resistance R4 is grounded by the capacitor C4,
The other end of the resistance R4 also passes through the clamp diode U2 connection power supply, another moved end connection of the relay K1
Another moved end of the relay K2.
3. the direct current biasing according to claim 2 for human body Collection equipment eliminates circuit, it is characterised in that:
It further include electrode delamination detection circuit, a moved end of the relay K1 also passes through the resistance R5 connection power supply AVDD, institute
A moved end for stating relay K2 also passes through resistance R6 connection power supply AVSS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821864805.0U CN209281373U (en) | 2018-11-13 | 2018-11-13 | Direct current biasing for human body Collection equipment eliminates circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821864805.0U CN209281373U (en) | 2018-11-13 | 2018-11-13 | Direct current biasing for human body Collection equipment eliminates circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209281373U true CN209281373U (en) | 2019-08-20 |
Family
ID=67601045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821864805.0U Active CN209281373U (en) | 2018-11-13 | 2018-11-13 | Direct current biasing for human body Collection equipment eliminates circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209281373U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305437A (en) * | 2020-10-10 | 2022-04-12 | Oppo（重庆）智能科技有限公司 | Electrocardio characteristic detection device and method and electrocardio characteristic detection system |
-
2018
- 2018-11-13 CN CN201821864805.0U patent/CN209281373U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114305437A (en) * | 2020-10-10 | 2022-04-12 | Oppo（重庆）智能科技有限公司 | Electrocardio characteristic detection device and method and electrocardio characteristic detection system |
| CN114305437B (en) * | 2020-10-10 | 2024-01-30 | Oppo（重庆）智能科技有限公司 | Electrocardiogram feature detection device and method, and electrocardiograph feature detection system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102488509B (en) | Device and method for acquiring biological electric signals | |
| CN102551727B (en) | Respiratory information detecting method and device | |
| CN109381185A (en) | A kind of surface myoelectric signal collection apparatus | |
| CN209281373U (en) | Direct current biasing for human body Collection equipment eliminates circuit | |
| CN109962871B (en) | ASK amplitude modulation signal envelope detection system | |
| CN104000576A (en) | Electrocardiosignal amplifier | |
| CN102832904A (en) | CMOS (complementary metal-oxide semiconductor transistor) biomedical signal acquisition unit in differential capacitance network feedback structure | |
| CN205157636U (en) | Alternating current acquisition circuit that pottery mechanical equipment used | |
| WO2024109038A1 (en) | Device for acquiring electroencephalogram signal by means of electric potential | |
| CN2912512Y (en) | ECG detection circuit with excellent noise suppressing function | |
| CN109247922A (en) | A kind of detection method and device of electrocardiogram acquisition equipment pacemaker impulse | |
| CN209826722U (en) | Surface electromyogram signal acquisition device | |
| CN104706344A (en) | Electrocardiosignal measurement collecting system | |
| CN205786850U (en) | A kind of mains by harmonics signals collecting pretreatment circuit | |
| CN209030167U (en) | Millivolt level signal isolation amplifying circuit | |
| CN104257377A (en) | Volumetric measurement circuit and method with ultra-low power consumption and no electrode resistance suitable for heart rhythm detection | |
| CN204600460U (en) | The induction reactance regulating circuit of ECG detecting circuit and ECG detecting equipment | |
| CN203122375U (en) | Non-invasive blood pressure anti-interference circuit | |
| CN211014450U (en) | Electrical quantity acquisition device of power distribution equipment | |
| CN104571252B (en) | A kind of polymorphic type analog signal processing circuit of single power supply | |
| CN203883774U (en) | Module for amplifying signals in transformer substation gas concentration detection system | |
| CN110882467A (en) | Sleeping instrument | |
| CN207460116U (en) | A kind of blood pressure second order high-pass filtering amplifying circuit | |
| CN212327147U (en) | Sleeping instrument | |
| CN203935184U (en) | A kind of electrocardiosignal pre-amplification circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |