Wireless transmission electroencephalogram signal collector based on battery power supply

Abstract

The utility model discloses a wireless transmission electroencephalogram signal collector based on battery power supply. The wireless transmission electroencephalogram signal collector comprises a key, a battery, an MCU (Microprogrammed Control Unit), and a wireless transceiving module, a display device and an EEG (Electroencephalogram) analog front end which are respectively and electrically connected with the MCU, and the battery is electrically connected with the MCU unit through a key detection circuit. According to the wireless transmission electroencephalogram signal collector based on battery power supply, power is supplied through the battery, so that wireless output is not related to a power grid, interference of the power grid is avoided, the electric shock risk is avoided, and the safety of equipment is improved. Meanwhile, the collector is provided with the display screen, so that when multiple collectors work at the same time, the information of the collected person can be displayed on the display screen at the same time, and confusion is avoided.

Description

Technical Field

[0001] The utility model relates to the field of brain electric signal acquisition, in particular to a battery-powered wireless transmission brain electric signal collector. Background Art

[0002] Traditional EEG signal acquisition devices primarily rely on wired data transmission and power supply technology, using USB ports for data transmission and power supply. For example, EEG amplifiers using wired connections are susceptible to interference from the power grid, such as rapid pulse trains and surges, which can affect EEG signal acquisition quality. Furthermore, because the entire device is powered by the grid, and EEG signal acquisition requires electrodes to be attached to the head, this can pose a risk of electric shock, posing a safety hazard. Utility Model Content

[0003] In order to overcome the shortcomings of the existing technology, a battery-powered wireless transmission EEG signal collector is proposed.

[0004] A battery-powered wireless EEG signal collector includes a key, a battery, an MCU unit, and a wireless transceiver module, a display device, and an EEG simulation front end electrically connected to the MCU unit. The battery and the MCU unit are electrically connected via a key detection circuit.

[0005] When the button is pressed, an anti-reverse connection circuit is formed inside the button detection circuit; when the power is turned on, the MCU unit starts working, and after the button pops up, the collector completes the startup; when the button is pressed again, the MCU unit completes the button detection through the input voltage of the preset pin.

[0006] Preferably, the key detection circuit at least includes: a first MOS transistor, a second MOS transistor, a fourth MOS transistor, and a first diode;

[0007] The first path of the MCU unit is connected to the ground via the first diode and the button; the second path of the MCU unit is connected to the battery via the fourth MOS transistor and the first MOS transistor; the first path of the battery is connected to the ground via the first MOS transistor, the first diode, and the button; the second path of the battery is connected to the ground via the first MOS transistor and the fourth MOS transistor; the third path of the battery is connected to the ground via the first MOS transistor and the second MOS transistor; and the fourth path of the battery is connected to the preset power supply voltage via the first MOS transistor and the second MOS transistor.

[0008] Preferably, it further includes a power supply control circuit for the EEG analog front end; the power supply control circuit includes at least a third MOS transistor and a fifth MOS transistor;

[0009] The S pole of the third MOS tube is connected to the preset power supply voltage, the D pole of the third MOS tube is connected to the preset signal input terminal, and the G pole of the third MOS tube is connected to the D pole of the fifth MOS tube; the S pole of the fifth MOS tube is connected to the ground, and the G pole of the fifth MOS tube is connected to the MCU unit.

[0010] Preferably, a third resistor is further connected between the second MOS transistor and the ground.

[0011] Preferably, an eighth resistor is further connected between the first diode and the MCU unit.

[0012] Preferably, a second resistor is connected between the S pole and the G pole of the third MOS tube.

[0013] Preferably, a seventh resistor is connected between the G pole and the S pole of the third MOS tube.

[0014] Preferably, a fifth resistor is connected between the G pole of the fifth MOS tube and the MCU unit.

[0015] Preferably, the display device is an OLED display screen.

[0016] Preferably, the EEG analog front end is connected to the MCU unit via an SPI interface.

[0017] This battery-powered wireless EEG signal collector is designed to be battery-powered, making the wireless output independent of the power grid, immune to interference from the grid, and eliminating the risk of electric shock, thus improving device safety. Furthermore, the collector is equipped with a display screen. When multiple collectors are operating simultaneously, the screen can simultaneously display the information of the individual being collected, avoiding confusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a circuit diagram of a battery-powered wireless EEG signal collector in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention 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 only used to explain the present invention and are not intended to limit the present invention.

[0020] In one embodiment, if Figure 1As shown, a battery-powered wireless transmission EEG signal collector is provided, including a button S1, a battery, an MCU unit, and a wireless transceiver module, a display device, and an EEG simulation front end electrically connected to the MCU unit respectively; the battery and the MCU unit are electrically connected through a button detection circuit; wherein the wireless transceiver module is used to receive and send wireless transmission signals; the EEG simulation front end is connected to the unit to be tested VinA through an EEG lead wire.

[0021] When the button is pressed, an anti-reverse polarity circuit is formed inside the button detection circuit; when the power is turned on, the MCU unit starts working, and after the button is released, the collector completes the startup; when the button is pressed again, the MCU unit completes the button detection by the input voltage of the preset pin.

[0022] Specifically, the key detection circuit includes: a first MOS transistor Q1, a second MOS transistor Q2, a fourth MOS transistor Q4, a first diode D1 and multiple auxiliary resistors: a first resistor R1, a third resistor R3, a fourth resistor R4, a sixth resistor R6 and an eighth resistor R8.

[0023] The first path of the MCU unit is connected to ground via the first diode D1 and the button S1; the second path of the MCU unit is connected to the battery via the fourth MOS transistor Q4 and the first MOS transistor Q1; the first path of the battery is connected to ground via the first MOS transistor Q1, the first diode D1, and the button S1; the second path of the battery is connected to ground via the first MOS transistor Q1 and the fourth MOS transistor Q4; the third path of the battery is connected to ground via the first MOS transistor Q1 and the second MOS transistor Q2; the fourth path of the battery is connected to the preset power supply voltage VCC via the first MOS transistor Q1 and the second MOS transistor Q2. A third resistor R3 is also connected between the second MOS transistor Q2 and ground. An eighth resistor R8 is also connected between the first diode D1 and the MCU unit.

[0024] When the battery is just connected, since S1 is not pressed, the MCU has no power supply and the PW_ON GPIO is in a high-impedance state. The VGS voltage of the first MOS tube Q1 is equal to 0, Q1 is in the cut-off state, and the system is shut down.

[0025] When S1 is pressed, the G electrode voltage of the first MOS transistor Q1 is pulled to a low level through the first diode D1 and the ground of the button S1. The VGS of the first MOS transistor Q1 is approximately equal to -VCC, and the first MOS transistor Q1 is turned on. At the same time, the second MOS transistor Q2 and the third resistor R3 form an anti-reverse connection circuit to determine whether the connection is correct, prevent equipment damage, ensure equipment stability, and protect personnel safety.

[0026] When the power is turned on, the MCU unit starts working and outputs a high level to the PW_ON GPIO. At this time, the fourth MOS tube Q4 is turned on. After the button S1 is released, the circuit power supply state is maintained and the system startup is completed.

[0027] When the system is powered on, press button S1 again. At this time, the PW_KEY GPIO of the MCU is pulled to a low level through the first diode D1 and button S1. The MCU completes the button detection by detecting the high and low voltage of the PW_KEY GPIO input.

[0028] Furthermore, the system further includes a power supply control circuit for the EEG simulation front end, which includes a third MOS transistor Q3, a fifth MOS transistor Q5, and a plurality of auxiliary resistors: a second resistor R2, a fifth resistor R5, and a seventh resistor R7.

[0029] The S-pole of the third MOS transistor is connected to a preset power supply voltage, the D-pole of the third MOS transistor Q3 is connected to a preset signal input terminal VinA, and the G-pole of the third MOS transistor Q3 is connected to the D-pole of the fifth MOS transistor Q5. The S-pole of the fifth MOS transistor Q5 is connected to ground, and the G-pole of the fifth MOS transistor Q5 is connected to the MCU unit. A third resistor R3 is also connected between the second MOS transistor and ground. An eighth resistor R8 is also connected between the first diode and the MCU unit. A seventh resistor R7 is connected between the G-pole and S-pole of the third MOS transistor.

[0030] When data acquisition is needed, the MCU outputs a high level to the PW_VinA_ON GPIO pin, turning on the fifth MOSFET Q5 and the third MOSFET Q3, powering the analog front end. After the analog front end is powered on, the MCU configures the analog front end for data acquisition via the SPI interface. After data acquisition is complete, the MCU outputs a low level to the PW_VinA_ON GPIO pin, turning off the fifth MOSFET Q5 and the third MOSFET Q3. This stops powering the analog front end, reducing system power consumption and extending battery life.

[0031] In terms of data transmission strategy, the system adopts wireless transmission. Due to the large number of wireless communication devices and the complex electromagnetic environment, wireless transmission may be blocked. Therefore, a suitable data packetization and caching strategy must be adopted to ensure the completeness of the collected data. The data transmission strategy of this collector is as follows:

[0032] 1) Apply for a large data cache in the MCU system that can store more than 30S of collected data;

[0033] 2) Pack the data into 10ms sampling packets and save them in the cache.

[0034] 3) When the transmission interface is able to output data, the data is taken out in frames and then transmitted through the wireless interface.

[0035] Furthermore, the display device is, but is not limited to, an OLED display. When using an OLED display, the first line of the display permanently displays the acquisition duration, analog front-end status, wireless signal strength, and battery charge. The MCU simulates the remaining display space into a framebuffer, which is fully controlled by the receiver. The receiver can display the identity information of the person being collected on the OLED display used for EEG acquisition, thus avoiding confusion when collecting data from multiple people simultaneously.

[0036] Furthermore, the power control strategy of this collector includes:

[0037] 1) If the device cannot connect to the designated receiver within 5 minutes after being turned on, it will automatically shut down;

[0038] 2) If EEG data is not collected after the device is turned on, turn off the power of the analog front end;

[0039] 3) After data collection is completed, the device will automatically shut down if there is no new data collection instruction within 10 minutes.

[0040] The above is an explanation of the battery-powered wireless EEG signal collector of the present invention, which is used to help understand the present invention; however, the implementation of the present invention is not limited to the above-mentioned embodiments. Any changes, modifications, substitutions, combinations, and simplifications that do not deviate from the principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A battery-powered wireless EEG signal collector, characterized in that: It includes a button, a battery, an MCU unit, and a wireless transceiver module, a display device, and an EEG simulation front end electrically connected to the MCU unit respectively; the battery and the MCU unit are electrically connected via a button detection circuit; When the button is pressed, an anti-reverse connection circuit is formed inside the button detection circuit; when the power is turned on, the MCU unit starts working, and after the button is released, the collector completes the startup; When the button is pressed again, the MCU unit completes the button detection by adjusting the input voltage of the preset pin.

2. The battery-powered wireless EEG signal collector according to claim 1, characterized in that: The key detection circuit at least includes: a first MOS transistor, a second MOS transistor, a fourth MOS transistor, and a first diode; The first path of the MCU unit is connected to the ground via the first diode and the button; the second path of the MCU unit is connected to the battery via the fourth MOS transistor and the first MOS transistor; the first path of the battery is connected to the ground via the first MOS transistor, the first diode, and the button; the second path of the battery is connected to the ground via the first MOS transistor and the fourth MOS transistor; the third path of the battery is connected to the ground via the first MOS transistor and the second MOS transistor; and the fourth path of the battery is connected to the preset power supply voltage via the first MOS transistor and the second MOS transistor.

3. The battery-powered wireless EEG signal collector according to claim 2, characterized in that: It also includes a power supply control circuit for the EEG analog front end; the power supply control circuit includes at least a third MOS transistor and a fifth MOS transistor; The S pole of the third MOS tube is connected to the preset power supply voltage, the D pole of the third MOS tube is connected to the preset signal input terminal, and the G pole of the third MOS tube is connected to the D pole of the fifth MOS tube; the S pole of the fifth MOS tube is connected to the ground, and the G pole of the fifth MOS tube is connected to the MCU unit.

4. The battery-powered wireless EEG signal collector according to claim 2, characterized in that: A third resistor is further connected between the second MOS transistor and the ground.

5. The battery-powered wireless EEG signal collector according to claim 2, characterized in that: An eighth resistor is further connected between the first diode and the MCU unit.

6. The battery-powered wireless EEG signal collector according to claim 3, characterized in that: A second resistor is connected between the S pole and the G pole of the third MOS tube.

7. The battery-powered wireless EEG signal collector according to claim 3, characterized in that: A seventh resistor is connected between the G pole and the S pole of the third MOS tube.

8. The battery-powered wireless EEG signal collector according to claim 3, characterized in that: A fifth resistor is connected between the G terminal of the fifth MOS tube and the MCU unit.

9. The battery-powered wireless EEG signal collector according to any one of claims 1 to 8, characterized in that: The display device is an OLED display screen.

10. The battery-powered wireless EEG signal collector according to any one of claims 1 to 8, characterized in that: The EEG simulation front end is connected to the MCU unit via an SPI interface.

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