CN108888262B - Alternating current lead falling detection circuit and method for double-electrode electrocardio acquisition system - Google Patents
Alternating current lead falling detection circuit and method for double-electrode electrocardio acquisition system Download PDFInfo
- Publication number
- CN108888262B CN108888262B CN201810880472.9A CN201810880472A CN108888262B CN 108888262 B CN108888262 B CN 108888262B CN 201810880472 A CN201810880472 A CN 201810880472A CN 108888262 B CN108888262 B CN 108888262B
- Authority
- CN
- China
- Prior art keywords
- resistor
- rectifier
- capacitor
- electrocardio
- electrode
- 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
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
Abstract
The invention relates to an alternating current lead falling detection circuit and method for a double-electrode electrocardio acquisition system, comprising a relaxation oscillator, a rectifier, a hysteresis comparator, an external resistor, a first resistor, a second resistor, a first capacitor and a second capacitor; two outputs of the alternating current small signal current source are respectively connected to two electrodes of the input end of the electrocardio amplifier; two ends of the external resistor are connected to two electrodes of the input end of the electrocardio amplifier; two ends of the relaxation oscillator are connected to two electrodes of the input end of the electrocardio amplifier; one electrode of the electrocardio amplifier is connected with the rectifier through a first capacitor and a first resistor, and the other electrode of the electrocardio amplifier is connected with the rectifier through a second capacitor and a second resistor; the rectifier is connected with the positive input end of the hysteresis comparator. The invention adopts the alternating current detection method to ensure the high reliability of the system, saves the circuit area, is beneficial to reducing the power consumption of the system, meets the requirement of lead falling detection, and avoids the signal abnormality problem caused by lead falling.
Description
Technical Field
The invention relates to the field of electrocardiosignal acquisition and processing, in particular to an alternating current lead falling detection circuit and method for a double-electrode electrocardiosignal acquisition system.
Background
The collection of electrocardiosignals usually requires electrode connection, and if the leads fall off or are in poor contact, the collected electrocardiosignals are abnormal, so that normal medical diagnosis is affected. And when the leads are in poor contact, the leads are difficult to judge through human eyes or experience, so that the lead falling-off detection is an indispensable module of an electrocardio acquisition system.
The direct current lead drop detection mode is applicable only to three electrode configurations, whereas the alternating current lead drop detection mode is very useful when two electrodes are used. The existing alternating current lead falling detection circuit has the main defects of more modules and complex circuits, so that the circuit area is large, the power consumption is high, a certain false alarm rate can exist, and the small-area and low-power consumption design of the electrocardio acquisition equipment is not facilitated.
Disclosure of Invention
In view of the above, the invention aims to provide an alternating current lead falling detection circuit for a double-electrode electrocardio acquisition system, which overcomes the condition that leads fall off accidentally in the electrocardio signal acquisition process, has high integration level and effectively ensures the normal operation of the electrocardio acquisition system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an alternating current lead falling detection circuit for a double-electrode electrocardio acquisition system comprises a relaxation oscillator, a rectifier, a hysteresis comparator, an external resistor, a first resistor, a second resistor, a first capacitor and a second capacitor; two outputs of the alternating current small signal current source are respectively connected to two electrodes of the input end of the electrocardio amplifier; two ends of the external resistor are connected to two electrodes of the input end of the electrocardio amplifier; two ends of the relaxation oscillator are connected to two electrodes of the input end of the electrocardio amplifier; one electrode of the electrocardio amplifier is connected with the rectifier through a first capacitor and a first resistor, and the other electrode of the electrocardio amplifier is connected with the rectifier through a second capacitor and a second resistor; the rectifier is connected with the positive input end of the hysteresis comparator.
Further, the oscillation frequency expression of the relaxation oscillator is:
;
wherein the method comprises the steps ofCIn order to charge the capacitance value of the capacitor,V H at the high level of the power supply,V L at the low level of the power supply,I b is the bias current.
Further, the external resistor has a resistance of about 10M Ω.
Further, the two square-wave small current signals output by the relaxation oscillator are the same.
Further, the resistance values of the first resistor and the second resistor are equal, and the capacitance value of the first capacitor and the capacitance value of the second capacitor are equal.
Further, the rectifier is a current mode nested full wave rectifier.
Further, a method for an alternating current lead falling detection circuit of a double-electrode electrocardio acquisition system
S1, an alternating current small-signal current source is formed by a relaxation oscillator, generates a square wave voltage, and then converts the square wave voltage to obtain a square wave small-current signal;
step S2: the external resistor converts the square wave small current signal into alternating voltage;
step S3, the rectifier converts alternating voltage into direct voltage and outputs the direct voltage to the hysteresis comparator;
and S4, comparing the received direct current voltage with a set reference voltage by the hysteresis comparator, judging whether the lead falls off or not according to a comparison result, and judging that the lead falls off when the output of the hysteresis comparator is high level, otherwise, judging that the lead does not fall off.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts the alternating current detection method to realize the detection of the lead falling of the electrocardio acquisition system, has low structural complexity, ensures the high reliability of the system, saves the circuit area, is beneficial to reducing the power consumption of the system, meets the requirement of the lead falling detection of the double-electrode electrocardio acquisition system, and effectively avoids the problems of abnormal signals and the like caused by the lead falling.
Drawings
FIG. 1 is a circuit overall architecture of the present invention;
FIG. 2 is a flow chart of the detection of the present invention;
in the figure: 1-relaxation oscillator, 2-electrocardio amplifier, 3-rectifier, 4-hysteresis comparator.
Detailed Description
The invention will be further described with reference to the accompanying drawings and examples.
Referring to fig. 1, the present invention provides an ac lead falling detection circuit for a dual-electrode electrocardiograph acquisition system according to the embodiment of fig. 1, including relaxation vibrationOscillator 1, rectifier 3, hysteresis comparator 4, external resistorRFirst resistorR 1 A second resistorR 2 A first capacitorC 1 And a second capacitorC 2 The method comprises the steps of carrying out a first treatment on the surface of the Two outputs of the alternating current small signal current source are respectively connected to two electrodes at the input end of the electrocardio amplifier 2; external resistorRTwo ends of the electrode are connected to two electrodes at the input end of the electrocardio amplifier 2; the two ends of the relaxation oscillator 1 are connected to two electrodes at the input end of the electrocardio amplifier 2; the positive electrode of the electrocardio amplifier 2 passes through a first capacitorC 1 And a first resistorR 1 Connected to the rectifier 3, the negative electrode of the electrocardio amplifier 2 passes through a second capacitorC 2 And a second resistorR 2 Connected to the rectifier 3; the rectifier 3 is connected with the positive input end of the hysteresis comparator 4.
In an embodiment of the present invention, the oscillation frequency expression of the relaxation oscillator 1 is:
;
wherein the method comprises the steps ofCIn order to charge the capacitance value of the capacitor,V H at the high level of the power supply,V L at the low level of the power supply,I b is the bias current.
In one embodiment of the invention, the external resistorRThe resistance of (2) is about 10M omega.
In an embodiment of the present invention, the two square-wave small current signals output by the relaxation oscillator 1 are the same.
In one embodiment of the present invention, the first resistorR 1 And a second resistorR 2 Resistance value is equal, the first capacitorC 1 And a second capacitorC 2 Is equal to the capacitance of the capacitor.
In one embodiment of the present invention, the rectifier 3 is a current-mode nested full-wave rectifier.
In an embodiment of the invention, the relaxation oscillator 1 and hysteresis comparator 4 can be replaced by other types of oscillators and comparators.
In one embodiment of the invention, a method for an AC lead fall-off detection circuit of a dual-electrode electrocardiograph acquisition system
S1, an alternating current small-signal current source is formed by a relaxation oscillator, generates a square wave voltage, and then converts the square wave voltage to obtain a square wave small-current signal;
step S2: the external resistor converts the square wave small current signal into alternating voltage;
step S3, the rectifier converts alternating voltage into direct voltage and outputs the direct voltage to the hysteresis comparator;
and S4, comparing the received direct current voltage with a set reference voltage by the hysteresis comparator, judging whether the lead falls off or not according to a comparison result, and judging that the lead falls off when the output of the hysteresis comparator is high level, otherwise, judging that the lead does not fall off.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (4)
1. An alternating current lead falling detection circuit for a double-electrode electrocardio acquisition system is characterized in that: the device comprises a relaxation oscillator, a rectifier, a hysteresis comparator, an external resistor, a first resistor, a second resistor, a first capacitor and a second capacitor; two outputs of the alternating current small signal current source are respectively connected to two electrodes of the input end of the electrocardio amplifier; two ends of the external resistor are connected to two electrodes of the input end of the electrocardio amplifier; two ends of the relaxation oscillator are connected to two electrodes of the input end of the electrocardio amplifier; one electrode of the electrocardio amplifier is connected with the rectifier through a first capacitor and a first resistor, and the other electrode of the electrocardio amplifier is connected with the rectifier through a second capacitor and a second resistor; the output end of the rectifier is connected with the positive input end of the hysteresis comparator;
the oscillation frequency expression of the relaxation oscillator is as follows:
wherein C is the capacitance value of the charging capacitor, V H At high level, V L At low level, I b Is a bias current;
the resistance values of the first resistor and the second resistor are equal, and the capacitance value of the first capacitor and the capacitance value of the second capacitor are equal;
the two square wave small current signals output by the relaxation oscillator are the same;
the alternating small signal current source is constituted by a relaxation oscillator.
2. An ac lead fall-off detection circuit for a dual electrode electrocardiograph acquisition system according to claim 1, characterized in that: the resistance value of the external resistor is 10MΩ.
3. An ac lead fall-off detection circuit for a dual electrode electrocardiograph acquisition system according to claim 1, characterized in that: the rectifier is a current mode nested full wave rectifier.
4. The detection method of the alternating current lead fall-off detection circuit for the double-electrode electrocardio acquisition system, which is characterized in that:
s1, an alternating current small-signal current source is formed by a relaxation oscillator, generates a square wave voltage, and then converts the square wave voltage to obtain a square wave small-current signal;
step S2: the external resistor converts the square wave small current signal into alternating voltage;
step S3, the rectifier converts alternating voltage into direct voltage and outputs the direct voltage to the hysteresis comparator;
and S4, comparing the received direct current voltage with a set reference voltage by the hysteresis comparator, judging whether the lead falls off or not according to a comparison result, and judging that the lead falls off when the output of the hysteresis comparator is high level, otherwise, judging that the lead does not fall off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880472.9A CN108888262B (en) | 2018-08-04 | 2018-08-04 | Alternating current lead falling detection circuit and method for double-electrode electrocardio acquisition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810880472.9A CN108888262B (en) | 2018-08-04 | 2018-08-04 | Alternating current lead falling detection circuit and method for double-electrode electrocardio acquisition system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108888262A CN108888262A (en) | 2018-11-27 |
| CN108888262B true CN108888262B (en) | 2023-08-04 |
Family
ID=64353326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810880472.9A Active CN108888262B (en) | 2018-08-04 | 2018-08-04 | Alternating current lead falling detection circuit and method for double-electrode electrocardio acquisition system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108888262B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663596A (en) * | 2018-05-14 | 2018-10-16 | 无锡商业职业技术学院 | A kind of wearable ECG lead-fail detector detection device and detection method |
| CN112741633B (en) * | 2019-10-31 | 2024-04-05 | 深圳市理邦精密仪器股份有限公司 | Electrocardiogram signal detection system and electrocardiosignal detection device |
| CN114224349B (en) * | 2021-12-10 | 2023-12-19 | 深圳市汇顶科技股份有限公司 | Contact state detection device and wearable equipment |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1467344A (en) * | 1974-01-02 | 1977-03-16 | Cardiac Resuscitator Corp | Life sign monitoring apparatus |
| JPH02309240A (en) * | 1989-05-24 | 1990-12-25 | Yokogawa Electric Corp | Ph converter |
| US5368041A (en) * | 1992-10-15 | 1994-11-29 | Aspect Medical Systems, Inc. | Monitor and method for acquiring and processing electrical signals relating to bodily functions |
| JPH11332839A (en) * | 1998-05-26 | 1999-12-07 | Nec Gumma Ltd | Electrode abnormality detection circuit |
| DE19923094A1 (en) * | 1999-05-20 | 2000-11-23 | Meonic Sys Eng Gmbh | Circuit arrangement for suppression of electrical leakage currents from electrodes connected to electrocardiograph (ECG) patient by generation of atypical output signal when electrode becomes loose |
| US6267723B1 (en) * | 1998-03-02 | 2001-07-31 | Nihon Kohden Corporation | Medical telemetery system, and a sensor device and a receiver for the same |
| CN101133334A (en) * | 2005-03-02 | 2008-02-27 | 皇家飞利浦电子股份有限公司 | Low power standby mode monitor |
| CN102755161A (en) * | 2012-03-30 | 2012-10-31 | 浙江好络维医疗技术有限公司 | Lead drop detection device and method for electrocardio monitoring |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209074605U (en) * | 2018-08-04 | 2019-07-09 | 福州大学 | A kind of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System |
-
2018
- 2018-08-04 CN CN201810880472.9A patent/CN108888262B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1467344A (en) * | 1974-01-02 | 1977-03-16 | Cardiac Resuscitator Corp | Life sign monitoring apparatus |
| JPH02309240A (en) * | 1989-05-24 | 1990-12-25 | Yokogawa Electric Corp | Ph converter |
| US5368041A (en) * | 1992-10-15 | 1994-11-29 | Aspect Medical Systems, Inc. | Monitor and method for acquiring and processing electrical signals relating to bodily functions |
| US6267723B1 (en) * | 1998-03-02 | 2001-07-31 | Nihon Kohden Corporation | Medical telemetery system, and a sensor device and a receiver for the same |
| JPH11332839A (en) * | 1998-05-26 | 1999-12-07 | Nec Gumma Ltd | Electrode abnormality detection circuit |
| DE19923094A1 (en) * | 1999-05-20 | 2000-11-23 | Meonic Sys Eng Gmbh | Circuit arrangement for suppression of electrical leakage currents from electrodes connected to electrocardiograph (ECG) patient by generation of atypical output signal when electrode becomes loose |
| CN101133334A (en) * | 2005-03-02 | 2008-02-27 | 皇家飞利浦电子股份有限公司 | Low power standby mode monitor |
| CN102755161A (en) * | 2012-03-30 | 2012-10-31 | 浙江好络维医疗技术有限公司 | Lead drop detection device and method for electrocardio monitoring |
Non-Patent Citations (1)
| Title |
|---|
| A decoupling-capacitor free and enlarged-ICMR ECG readout circuit using offset feedback cancelling and charge pump-sustained input stage techniques;Huang Jiwei, et al.;《2017 international conference on circuits, devices and systems》;第16-20页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108888262A (en) | 2018-11-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108888262B (en) | Alternating current lead falling detection circuit and method for double-electrode electrocardio acquisition system | |
| US10910818B2 (en) | Anti-short-circuit detection apparatus and user terminal | |
| CN204669077U (en) | On-Line UPS | |
| CN204287446U (en) | A kind of power-fail detection circuit | |
| CN103675421A (en) | Power burr signal detection circuit and detection method thereof | |
| CN106526267A (en) | Single-phase intelligent electricity-stealing-prevention electric energy meter and method for reducing power consumption | |
| CN205126227U (en) | A auto awake -up device for electrocardio equipment | |
| CN105301478A (en) | Detection device and detection method of 3.7V cell single-string protection plate | |
| CN108205100A (en) | A kind of circuit checker | |
| CN209074605U (en) | A kind of exchange lead-fail detector detection circuit for bipolar electrode ECG Gathering System | |
| CN205091391U (en) | Direct current busbar voltage ripple detection device | |
| CN110888168B (en) | Interface detection circuitry charges, intelligent wearing equipment and charging system | |
| CN112596000A (en) | Method and device for detecting reverse connection of PV input ends of photovoltaic inverters | |
| CN208459549U (en) | A kind of arrangement for detecting based on comparator | |
| EP3854304B1 (en) | Detection circuit, electrocardiogram measurement apparatus, and wearable device | |
| CN206440799U (en) | A kind of circuit checker | |
| CN207504862U (en) | A kind of telecommunications early warning system | |
| CN209878081U (en) | Water level detection circuit based on positive and negative symmetrical square wave direct current | |
| CN103901358A (en) | Three-phase power supply abnormality detection device | |
| CN103675428A (en) | Power burr signal detection circuit and detection method thereof | |
| CN217981764U (en) | Monitoring device and electronic equipment | |
| CN215813004U (en) | Alternating current sampling circuit based on Hall sensor | |
| CN216696594U (en) | Battery discharge abnormity counting device | |
| CN218546868U (en) | Sensor synchronous data acquisition circuit | |
| CN214380174U (en) | Mobile power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |