CN2865563Y - Electroencephalogram collecting instrument - Google Patents
Electroencephalogram collecting instrument Download PDFInfo
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- CN2865563Y CN2865563Y CN 200520023760 CN200520023760U CN2865563Y CN 2865563 Y CN2865563 Y CN 2865563Y CN 200520023760 CN200520023760 CN 200520023760 CN 200520023760 U CN200520023760 U CN 200520023760U CN 2865563 Y CN2865563 Y CN 2865563Y
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- usb
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- power supply
- chip microcomputer
- chip
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Abstract
The utility model discloses an EEG acquisition instrument, including brain electrode, lead switch, amplifier, analog to digital converter, single chip computer and USB port as well as computer. It has an entire hardware free conversion circuit and is connected with single chip computer through USB port, and the serial port of the single chip computer is connected with the input port of the shift register, while the output port is connected with the analog switch control port; photoelectric coupler is connected between the transmitting and receiving data access ports of the single chip and the transmitting and receiving data access port of the USB functional equipments. The power port of the USB general serial bus and the EEG amplifier, power supply port are connected with separated DC-DC power source. The utility model has the possibility to overcome various disturbances in the computer and makes the patients in the floating state and improves the safety of the system. The entire hardware lead conversion circuit reduces the distortion due to software conversion.
Description
Technical field
This utility model relate to a kind of be used for pathological analysis, the diagnosis carry out data acquisition the electroencephalogram Acquisition Instrument.
Background technology
At present, the switching of leading that known electroencephalogram Acquisition Instrument is used has hardware to lead and software leads two kinds, wherein to lead be to utilize unipolar lead to obtain the information of leading by simple mathematical plus-minus to software, for inevitable time difference in the fluctuation of reference electrode and the digitized process, may there be the deviation that is difficult to expect.It then is to utilize in real time the lead switching of hardware between respectively leading that hardware leads, and output is the undistorted information of leading accurately.General hardware leads and selects just to do several fixed EEG signals in advance and switch, and the needs that lead of different patients and various disease can not be selected arbitrarily in EEG signals.Only be to utilize a certain combination of leading directly to gather the acquisition data, or the combination of leading obtain indirectly by mathematical operation, seldom has hardware to realize the combination in any of leading.In addition,, have only the microvolt level, can be subjected to inevitably disturbing and influence, seriously hindered the analysis of pathology from each side because EEG signals is very faint.And Acquisition Instrument is when linking to each other with computer, and the power supply that its USB mouth is sent is the high-tension electricity that computer uses, and this brain electrode will directly link to each other with the human brain scalp, if this two polygonal voltage is not kept apart, just has human brain and puts on the situation appearance that electrode has the crisp sensation of fiber crops.
The utility model content
The purpose of this utility model is for addressing the above problem, make its patient be in floating ground state and provide a kind of, improving the electroencephalogram Acquisition Instrument of security of system, reliability.
For achieving the above object, technical solution of the present utility model is finished like this: a kind of electroencephalogram Acquisition Instrument, comprise brain electrode, the switching of leading, amplifier, analog-digital converter, single-chip microcomputer, USB mouth, computer, wherein it has the devices at full hardware commutation circuit of leading arbitrarily, be connected to single-chip microcomputer by the USB mouth, the serial ports of this single-chip microcomputer is connected in the shift register input, and its outfan connects the control end of analog switch; With
Described single-chip microcomputer is sent out, is picked data terminal and connects, sends with USB function device chip and be connected photoelectrical coupler between the data terminal; With
Power port in the described USB USB (universal serial bus) is connected the DC-DC insulating power supply with EEG amplifier feeder ear.
This electroencephalogram Acquisition Instrument mainly is a EEG signal that conversion is good delivers to the serial ports of USB function device chip through the serial ports of Single Chip Microcomputer (SCM) system, and the crystal oscillator of its Single Chip Microcomputer (SCM) system is 24MHz, and its baud rate is fosc/32=750K, has improved serial ports speed.USB function device chip sends to computer with the EEG signal that receives through the USB universal serial bus, and receives the control information from computer.Two photoelectrical couplers are set between single-chip microprocessor system and USB functional chip, realize that the high pressure between EEG amplifier section and the USB control chip is isolated.Power supply in the USB universal serial bus of computer provides power supply for USB function device chip, and is the switching of leading through the DC-DC insulating power supply, and preamplifier, analog-digital converter and Single Chip Microcomputer (SCM) system provide power supply, reach jamproof purpose.
The hardware handover information that leads, give single-chip microcomputer by the USB oral instructions, when the serial port of this single-chip microcomputer works in mode O, can be used as shift register, the shift register that the output of 18 parallel-by-bits is imported in 32 serials of the external cascade of serial port of single-chip microcomputer changes the continuous 32 frame serial datas that have the information of leading into parallel data output.The outfan that the shift register of 18 parallel-by-bits output is imported in each serial connects the control end of analog switch, has constituted 16 of EEG signals and has led the switched system of leading switch entirely.
As mentioned above, this photoelectrical coupler is to select 6N137 for use, its+the 5V feeder ear passes through resistance R
2, be connected to Vcc, capacitor C respectively
3Ground connection; The E end passes through capacitor C
1, resistance R
1Meet power supply VCcc, wherein capacitor C
1One end ground connection, the power Vcc end passes through capacitor C
2Ground connection.
As mentioned above, this DC-DC insulating power supply is to select F0505AD-2W for use, before its Vout connects and isolates+the 5V power supply, Vin connects after the isolation+the 5V power supply, the input end grounding of OV outfan, GND, and between two earth terminals, connect an isolation resistance R
5
As mentioned above, this USB function device chip is to select AN2131 for use, and its power supply side is connected to the power port of USB USB (universal serial bus) respectively.
Characteristics of the present utility model are to be to adopt in real time the lead switching of devices at full hardware between respectively leading, and output is the undistorted information of leading accurately.The inevitable time difference in the fluctuation of reference electrode and digitized process when it has effectively avoided owing to the software selection, the situation of the signal discordance that the switching signal of leading that is occurred is connected with reality.It is reliable that employing hardware carries out handover security, more guarantees to analyze the correctness of EEG signals; In addition, the power supply that adopts computer USB mouth is through the power supply of DC-DC insulating power supply, and USB control chip and EEG amplifier section employing photoelectric coupling technology have effectively overcome the probability that the various interference in the computer seal in the EEG amplifier, make patient be in floating ground state, the safety that has improved system.
Description of drawings
Fig. 1 is this novel structured flowchart.
Fig. 2 is the commutation circuit figure that leads.
Fig. 3 is analog-digital converter and single-chip microcomputer connection diagram.
Fig. 4 is a photoelectricity coupling buffer circuit schematic diagram.
Fig. 5 is that electrical level transferring chip and USB functional section are equipped with the chip connection diagram.
Fig. 6 is the sketch map of DC-DC insulating power supply.
The specific embodiment
Below in conjunction with accompanying drawing embodiment, to this novel being further described.
By electroencephalogram Acquisition Instrument block diagram shown in Figure 1, comprise 1 electrode for encephalograms, 2 lead switching, 3 preamplifiers, 4 analog-digital converters, 5 single-chip microcomputers, 6 photoelectrical coupler 6N137,7USB function device chip AN2131,8 computers part, 9DC-DC insulating power supply.
This electrode for encephalograms [1] places human brain by international 10-20 system electrode placement methods, electrode for encephalograms [1] is connected to the input of switching [2] that leads, being input in the preamplifier [3] through the signal that leads after switching, the outfan of preamplifier [3] is connected to analog-digital converter 4, controls lead switching [2] and analog-digital converter [4] by single-chip microcomputer [5].To gather the data of coming through photoelectric coupled device 6N137[6 by the serial ports of single-chip microcomputer [5]] pass to USB function device chip AN2131[7] serial ports.USB function device chip AN2131[7] by the USB USB (universal serial bus) data are passed in the computer [8] again.Simultaneously, the control signal of computer [8] also passes to USB function device chip AN2131[7 by the USB USB (universal serial bus)] in.USB function device chip AN2131[7] with control signal through photoelectric coupled device 6N137[6] pass to single-chip microcomputer [5].Computer power supply is directly given USB function device chip AN2131[7 through USB USB (universal serial bus) (maximum 500mA)] power, and give the switching part [2] that leads, preamplifier [3], analog-digital converter [4], single-chip microcomputer [5] power supply by DC-DC insulating power supply [9].
The circuit theory diagrams that the hardware that Fig. 2 has provided EEG signals leads and switches;
Single-chip microcomputer among Fig. 2 [5] is selected W77LE58 for use.
This handover information that leads is given single-chip microcomputer by the USB mouth, because the serial port of single-chip microcomputer can be used as shift register when working in mode 0, CD4094 is the shift register of serial input/8 parallel-by-bits output of CMOS.Two CD4094 constitute the shift register of the 16 parallel-by-bits output of tandem.After the serial port of single-chip microcomputer is sent 2 frame serial datas continuously, utilize the control end of single-chip microcomputer to send the gating signal of shift register, just can go out shift register output to 16 bit data simultaneously.So 32 CD4094 of cascade just can export 16 control informations of leading and switching simultaneously.
Concrete connection is the TXD end and the CD4094[10 of single-chip microcomputer [5]] the DATA end be connected, the RXD of single-chip microcomputer [5] end and CD4094[10] the clk end be connected, the gating port [16] and CD4094[10 of single-chip microcomputer of definition] the str end be connected, next CD4094[10] a DATA end and a last CD 4094[10] QS hold and be connected, clk and str connect together with the TXD of single-chip microcomputer [5] and [16] respectively, 32 CD4094[10 of cascade successively], just can be simultaneously by CD 4094[10] the Q0-Q7 end output control information of leading and switching.One of the selection of leading is led by two-way and is selected signal to constitute, wherein each road selects signal to be made of three analog switches [11], 24 EEG signals [12] of switching leading are connected the input end of analog signal [14] of three analog switches [11] on each road, A, the B of the analog switch on each road [11], C end all links together, and the outfan of each path analoging switch links together.The control end of each path analoging switch is made up of the inh of A, B, C and three analog switches of analog switch, the control end of each path analoging switch is connected in the outfan of corresponding C D4094, and the CD4094 dateout is selected the gating foundation of lead signals as analog switch.Shu Chu analogue signal is exactly that the 16 brain electric conductance connection signals of leading that lead after switching are exported [13] like this.
Fig. 3 has provided analog-digital converter and single-chip microcomputer connection diagram:
4A, 4B, 4C are three identical modulus conversion chip ADS7844 (8 passage) among Fig. 3, and 5 is single-chip microcomputer, selects W77LE58 for use;
This modulus conversion chip ADS7844 is 8 passages, and this utility model is that the 16 brain electricity products of leading are arranged, so used 3 such chips.The DCLK of modulus conversion chip ADS7844 is by the P1.0 mouth control of single-chip microcomputer, DIN is by the P1.1 mouth control of single-chip microcomputer, DOUT is by the P1.2 mouth control of single-chip microcomputer, 4A, 4B, the CS of 4C end is respectively by the P1.3 of single-chip microcomputer, P1.4, the control of P1.5 mouth, like this, under the control of single-chip microcomputer, become digital signal by analog digital conversion through amplified analog signal; The RXD end of single-chip microcomputer connects the C mouth of photoelectric coupled device 6A, and the TXD end connects "-" end of photoelectric coupled device 5B, realizes isolating the function of EEG amplifier section and USB control chip with two photoelectric coupled device 6N137; The light on and off of the P3.2 mouth control tri coloured lantern of single-chip microcomputer.
Fig. 4 has provided the schematic diagram of photoelectricity coupling buffer circuit.
R among Fig. 4
1=R
4=510 Ω,
R
2＝R
3＝300Ω，
C
1＝C
5＝15P，
C
2＝C
3＝C
4＝C
6＝0.1μ
6A among the figure and 6B are two photoelectric coupled device 6N137;
This single-chip microcomputer [5] and USB[7] between transmission be two-way, therefore adopted two photoelectric coupled device 6N137, to be implemented in input (EEG amplifier section) and to export high pressure isolation between (USB control chip).Photoelectric coupled device 6N137 is the chip of employing+5V power supply, and single-chip microcomputer [5] also is+the 5V power supply, thus be directly with 6N137[6] link to each other, promptly be that the RXD of single-chip microcomputer [5] connects the C end of [6A], "-" that TXD connects [6B] holds; And USB[7] be+the 3V power supply, so need use electrical level transferring chip 74HC245[10], with realization+3V and+conversion of 5V level after, and then connect USB7, promptly be that "-" end of 6A and the B0 end of electrical level transferring chip 74HC24510 link to each other, the C end of 6B links to each other with 10 A1 end.
Fig. 5 has provided electrical level transferring chip and USB functional chip connection diagram;
[17] are electrical level transferring chip 74HC245 among Fig. 5;
[7] be USB function device chip AN2131;
This USB function device chip AN2131[7] TX0 and electrical level transferring chip 74HC245[17] A0 link to each other the B of the RXO of [7] and [17]
1Link to each other, purpose is that the data that will gather are through photoelectric coupled device 6N137[6] pass to USB function device chip AN2131[7] serial ports, and then data are passed to computer by the USB (universal serial bus) of USB.
Fig. 6 has provided the sketch map of DC-DC insulating power supply:
9 is modules of DC-DC insulating power supply among Fig. 6;
R
5＝50MΩ；
Before the Vout of the module F0505AD-2W that this DC-DC insulating power supply 9 is selected for use connects and isolates+the 5V power supply, Vin connects after the isolation+the 5V power supply, and OV connects the ground of outfan, and GND connects the ground of input, connect the big resistance of a 50M Ω between these two ground, the voltage on both sides is kept apart.Because artificial circuit part will directly link to each other with the human brain scalp, and the power supply that the USB mouth is sent links to each other with computer, if the voltage on these both sides is not kept apart, just have human brain and put on the situation appearance that electrode has slightly numb sensation, for guaranteeing human body safety, this must be kept apart.
Claims (4)
1, a kind of electroencephalogram Acquisition Instrument comprises brain electrode, the switching of leading, amplifier, analog-digital converter, single-chip microcomputer, USB mouth, computer, it is characterized in that:
Have the devices at full hardware commutation circuit of leading arbitrarily, be connected to single-chip microcomputer by the USB mouth, the serial ports of this single-chip microcomputer is connected in the shift register input, and its outfan connects the control end of analog switch; With
Described single-chip microcomputer is sent out, is picked data terminal and connects, sends with USB function device chip and be connected photoelectrical coupler between the data terminal; With
Power port in the described USB USB (universal serial bus) is connected the DC-DC insulating power supply with EEG amplifier feeder ear.
2, by the described electroencephalogram Acquisition Instrument of claim 1, it is characterized in that: described photoelectrical coupler is selected 6N137 for use, its+the 5V feeder ear passes through resistance R
2, be connected to Vcc, capacitor C respectively
3Ground connection; The E end passes through capacitor C
1, resistance R
1Connect power Vcc, wherein capacitor C
1One end ground connection, the power Vcc end passes through capacitor C
2Ground connection.
3, by the described electroencephalogram Acquisition Instrument of claim 1, it is characterized in that: described DC-DC insulating power supply is to select F0505AD-2W for use, before its Vout connects and isolates+the 5V power supply, Vin connects after the isolation+the 5V power supply, the input end grounding of OV outfan, GND, and between two earth terminals, connect an isolation resistance R
5
4, by the described electroencephalogram Acquisition Instrument of claim 1, it is characterized in that: described USB function device chip is to select AN2131 for use, and its power supply side is connected to the power port of USB USB (universal serial bus) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520023760 CN2865563Y (en) | 2005-04-01 | 2005-04-01 | Electroencephalogram collecting instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520023760 CN2865563Y (en) | 2005-04-01 | 2005-04-01 | Electroencephalogram collecting instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2865563Y true CN2865563Y (en) | 2007-02-07 |
Family
ID=37701261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520023760 Expired - Fee Related CN2865563Y (en) | 2005-04-01 | 2005-04-01 | Electroencephalogram collecting instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2865563Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908864A (en) * | 2010-08-17 | 2010-12-08 | 秦皇岛市康泰医学系统有限公司 | Signal acquisition processing circuit for digital brain electrical activity mapping instrument |
| CN101904744A (en) * | 2010-08-06 | 2010-12-08 | 秦皇岛市康泰医学系统有限公司 | Anti-jamming circuit for myoelectricity evoked potential diagram instrument |
| CN117462148A (en) * | 2023-12-28 | 2024-01-30 | 慧创科仪(北京)科技有限公司 | Lead configuration device, method and storage medium for electroencephalogram detection equipment |
-
2005
- 2005-04-01 CN CN 200520023760 patent/CN2865563Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101904744A (en) * | 2010-08-06 | 2010-12-08 | 秦皇岛市康泰医学系统有限公司 | Anti-jamming circuit for myoelectricity evoked potential diagram instrument |
| CN101908864A (en) * | 2010-08-17 | 2010-12-08 | 秦皇岛市康泰医学系统有限公司 | Signal acquisition processing circuit for digital brain electrical activity mapping instrument |
| CN101908864B (en) * | 2010-08-17 | 2012-11-21 | 秦皇岛市康泰医学系统有限公司 | Signal acquisition processing circuit for digital brain electrical activity mapping instrument |
| CN117462148A (en) * | 2023-12-28 | 2024-01-30 | 慧创科仪(北京)科技有限公司 | Lead configuration device, method and storage medium for electroencephalogram detection equipment |
| CN117462148B (en) * | 2023-12-28 | 2024-05-14 | 慧创科仪(北京)科技有限公司 | Lead configuration device, method and storage medium for electroencephalogram detection equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070207 Termination date: 20110401 |