阅读说明：本技术 一种采集脑电信号电路及抗干扰方法 (Circuit for collecting electroencephalogram signals and anti-interference method ) 是由 杜武松 于 2019-12-21 设计创作，主要内容包括：本发明公开了一种采集脑电信号电脑及抗干扰方法,采集脑电信号电路,包括采集脑电信号模块、电源隔离电路、数字隔离电路、电源电路、主控制器,采集脑电信号模块分别与电源隔离电路的一端、数字隔离电路的一端连接,电源隔离电路的另一端与电源电路连接,数字隔离电路的另一端与主控制器连接；电源隔离电路用于隔离电源电路对采集脑电信号模块的干扰；数字隔离电路用于隔离主控制器对采集脑电信号模块的干扰。本申请采用三个采集电极、滤波电路、电源隔离电路、数字隔离电路,实现对脑电信号的采集与抗干扰,提高了脑电信号采集的精确性。(The invention discloses a computer for collecting electroencephalogram signals and an anti-interference method, wherein a circuit for collecting electroencephalogram signals comprises a module for collecting electroencephalogram signals, a power supply isolation circuit, a digital isolation circuit, a power supply circuit and a main controller, wherein the module for collecting electroencephalogram signals is respectively connected with one end of the power supply isolation circuit and one end of the digital isolation circuit, the other end of the power supply isolation circuit is connected with the power supply circuit, and the other end of the digital isolation circuit is connected with the main controller; the power supply isolation circuit is used for isolating the interference of the power supply circuit on the electroencephalogram signal acquisition module; the digital isolation circuit is used for isolating the interference of the main controller on the module for collecting the electroencephalogram signals. The electroencephalogram acquisition device adopts three acquisition electrodes, a filter circuit, a power supply isolation circuit and a digital isolation circuit, realizes acquisition and anti-interference of electroencephalogram signals, and improves accuracy of electroencephalogram signal acquisition.)

1. An anti-interference method for acquiring electroencephalogram signals is characterized in that: a power isolation circuit is arranged between the electroencephalogram signal acquisition module and a power supply and is used for isolating the interference of the power circuit on the electroencephalogram signal acquisition module; and a digital isolation circuit is arranged between the electroencephalogram signal acquisition module and the main controller and is used for isolating the interference of the main controller on the electroencephalogram signal acquisition module.

2. The anti-interference method for acquiring the electroencephalogram signals according to claim 1, which is characterized in that: and metal shielding shells are arranged outside the electroencephalogram signal acquisition module, the power supply isolation circuit and the digital isolation circuit and are used for isolating the interference of external electromagnetic signals on the electroencephalogram signal acquisition module.

3. The anti-interference method for acquiring the electroencephalogram signals according to claim 1, which is characterized in that: and a cable with a shielding function is used as a collecting electrode of the electroencephalogram signal collecting module.

4. A circuit for collecting electroencephalogram signals is characterized in that: the electroencephalogram signal acquisition module is respectively connected with one end of the power isolation circuit and one end of the digital isolation circuit, the other end of the power isolation circuit is connected with the power circuit, and the other end of the digital isolation circuit is connected with the main controller; the power supply isolation circuit is used for isolating the interference of the power supply circuit on the electroencephalogram signal acquisition module; the digital isolation circuit is used for isolating the interference of the main controller on the module for collecting the electroencephalogram signals.

5. The circuit for acquiring electroencephalogram signals according to claim 4, wherein: the power isolation circuit comprises a power isolation chip, an input filter circuit and an output filter circuit, wherein the input of the input filter circuit is connected with the power circuit, the output of the input filter circuit is connected with the input of the power isolation chip, the output of the power isolation chip is connected with the output filter circuit, and the output of the output filter circuit is used for providing electric energy for the electroencephalogram signal acquisition module.

6. The circuit for acquiring electroencephalogram signals according to claim 4, wherein: the digital isolation circuit comprises a digital isolation chip.

7. The circuit for acquiring electroencephalogram signals according to claim 4, wherein: the digital isolation circuit comprises a bidirectional optical coupling isolation circuit and is used for communication isolation of the main controller and the electroencephalogram signal acquisition module.

8. The circuit for acquiring electroencephalogram signals according to claim 4, wherein: the brain electrical signal acquisition module comprises a filter circuit and an analog-to-digital conversion module, and brain electrical signals acquired by the acquisition electrodes are filtered by the filter circuit, input to the analog-to-digital conversion module, converted into brain digital signals and transmitted to the main controller through the digital isolation circuit.

9. The circuit for acquiring electroencephalogram signals according to claim 4, wherein: the electroencephalogram signal acquisition module comprises three acquisition electrodes, and each acquisition electrode is connected with the analog-to-digital conversion module through a filter circuit.

10. The circuit for acquiring electroencephalogram signals according to claim 4, wherein: the filter circuit comprises a second-order passive RC filter circuit for realizing low-pass filtering; the analog-to-digital conversion module comprises an analog-to-digital conversion IC.

Technical Field

The invention relates to the technical field of electroencephalogram signal acquisition, in particular to an electroencephalogram signal acquisition circuit and an anti-interference method.

Background

An electroencephalogram (EEG) is a potential activity generated by brain nerves, contains rich brain activity information, and is a main signal source for anesthesia depth monitoring research. However, because the electroencephalogram (EEG) is very weak and is in the microvolt (uV) level, the EEG is easily interfered by the external environment, and if the interfered signals are not processed, the EEG can greatly affect the measurement of parameters related to the anesthesia depth. Among these interference sources are the circuit interference noise introduced by the high-frequency electric knife and the anesthesia depth monitoring equipment circuit. When the high-frequency electrotome acts on the body of a patient, an interference signal with very high amplitude and very high frequency can be loaded on the electroencephalogram electrode sheet and enters the acquisition module through a path conducted by the electroencephalogram signal, the interference reduction capability of a processing measure on hardware is limited at the moment, a large amount of high-energy and high-density interference signals are acquired and enter the acquisition module to be superposed and synthesized with the electroencephalogram waveform, and the whole electroencephalogram signal is submerged.

If the interference signal is not processed correspondingly, the weak electroencephalogram (EEG) is submerged, so that the electroencephalogram (EEG) cannot be collected, and in addition, the impedance is increased when the electroencephalogram electrode is in poor contact with the electroencephalogram electrode and is shaken and pulled during collection, so that the sampling effect is influenced.

Disclosure of Invention

The invention aims to provide a computer for collecting electroencephalogram signals and an anti-interference method. The accuracy of electroencephalogram signal acquisition is improved.

The above object of the present invention is achieved by the following technical solutions:

an anti-interference method for collecting EEG signals is characterized in that a power isolation circuit is arranged between an EEG signal collection module and a power supply and is used for isolating interference of the power isolation circuit on the EEG signal collection module; and a digital isolation circuit is arranged between the electroencephalogram signal acquisition module and the main controller and is used for isolating the interference of the main controller on the electroencephalogram signal acquisition module.

The invention is further configured to: and metal shielding shells are arranged outside the electroencephalogram signal acquisition module, the power supply isolation circuit and the digital isolation circuit and are used for isolating the interference of external electromagnetic signals on the electroencephalogram signal acquisition module.

The invention is further configured to: and a cable with a shielding function is used as a collecting electrode of the electroencephalogram signal collecting module.

The above object of the present invention is also achieved by the following technical solutions:

a circuit for collecting electroencephalogram signals comprises an electroencephalogram signal collecting module, a power supply isolating circuit, a digital isolating circuit, a power supply circuit and a main controller, wherein the electroencephalogram signal collecting module is respectively connected with one end of the power supply isolating circuit and one end of the digital isolating circuit, the other end of the power supply isolating circuit is connected with the power supply circuit, and the other end of the digital isolating circuit is connected with the main controller; the power supply isolation circuit is used for isolating the interference of the power supply circuit on the electroencephalogram signal acquisition module; the digital isolation circuit is used for isolating the interference of the main controller on the module for collecting the electroencephalogram signals.

The invention is further configured to: the power isolation circuit comprises a power isolation chip, an input filter circuit and an output filter circuit, wherein the input of the input filter circuit is connected with the power circuit, the output of the input filter circuit is connected with the input of the power isolation chip, the output of the power isolation chip is connected with the output filter circuit, and the output of the output filter circuit is used for providing electric energy for the electroencephalogram signal acquisition module.

The invention is further configured to: the digital isolation circuit comprises a digital isolation chip.

The invention is further configured to: the digital isolation circuit comprises a bidirectional optical coupling isolation circuit and is used for communication isolation of the main controller and the electroencephalogram signal acquisition module.

The invention is further configured to: the brain electrical signal acquisition module comprises a filter circuit and an analog-to-digital conversion module, and brain electrical signals acquired by the acquisition electrodes are filtered by the filter circuit, input to the analog-to-digital conversion module, converted into brain digital signals and transmitted to the main controller through the digital isolation circuit.

The invention is further configured to: the electroencephalogram signal acquisition module comprises three acquisition electrodes, and each acquisition electrode is connected with the analog-to-digital conversion module through a filter circuit.

The invention is further configured to: the filter circuit comprises a second-order passive RC filter circuit for realizing low-pass filtering; the analog-to-digital conversion module comprises an analog-to-digital conversion IC.

Compared with the prior art, the invention has the beneficial technical effects that:

1. according to the electroencephalogram signal acquisition circuit, the power isolation circuit and the digital isolation circuit are arranged in the electroencephalogram signal acquisition circuit, so that the interference of electroencephalogram signal acquisition from a power end and a signal end is isolated, and the accuracy of electroencephalogram signal acquisition is improved;

2. furthermore, the three collecting electrodes are adopted, one of the collecting electrodes is used as a reference electrode to judge whether the collecting electrode is in good contact with the skin, and errors in the collecting process are reduced.

Drawings

FIG. 1 is a schematic circuit diagram of an embodiment of the present invention;

FIG. 2 is a schematic diagram of a power isolation circuit according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a power isolation circuit according to another embodiment of the present invention;

FIG. 4 is a schematic diagram of a digital isolation circuit according to an embodiment of the present invention;

FIG. 5 is a block diagram of an electroencephalogram signal acquisition module according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a filter circuit according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.