Constant current flash stimulator

Abstract

This utility model relates to a constant current flashing stimulator. The stimulator includes a main control module and a power management module, a TYPEC communication module, an LED driver module, a step-down module, and TYPEC pins, all connected to the main control module. The LED driver module includes a driver chip and an LED. The main control module sends drive commands to the driver chip, which generates a level conversion signal to drive the LED to flash. The power management module supports both TYPEC interface power supply and battery power supply. The main control module communicates with a PC via the TYPEC interface for more editable settings. Compared with existing technologies, the stimulator's current output parameters are adjustable, ensuring high safety and preventing electrical burns.

Description

Technical Field

[0001] This utility model relates to the field of flash stimulator technology, and in particular to a constant current flash stimulator. Background Technology

[0002] A stroboscopic stimulator (SPS) is a device that stimulates the human eye by emitting rapid, rhythmic flashes of intense light. It is primarily used in medical diagnostics (especially electroencephalography, EEG) and neuroscience research. The SPS is also a controllable "flashlight" that doctors use to flash in front of your eyes at different speeds during an EEG. Its main purpose is to observe whether your brain reacts abnormally to the flashes, particularly to aid in the diagnosis of a type of epilepsy that is sensitive to light flashes. Because it carries the risk of triggering seizures, it must be operated by a qualified physician in a safe environment.

[0003] Existing technologies, traditional stroboscopic stimulators have the following main problems and drawbacks:

[0004] Insufficient brightness stability: Existing devices drive LED lights to flash by transmitting level signals from a microcontroller or a fixed signal source, but the brightness output is unstable, affecting the stimulation effect.

[0005] Power interference issues: The device often shares a power supply with other devices, resulting in insufficient or excessive voltage, which causes performance fluctuations.

[0006] Low precision of signal parameters: The frequency, brightness and number of lights of the control signal are not precisely adjusted, making it impossible to achieve fine control.

[0007] These problems limit the reliability and application range of the flash stimulator. This invention aims to overcome the above-mentioned shortcomings. Utility Model Content

[0008] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a constant current flash stimulator, which is a flash stimulator with constant current drive, multiple power supply methods and adjustable parameters, to solve problems such as unstable brightness, power interference and low signal accuracy.

[0009] The above-mentioned utility model objective is achieved through the following technical solution:

[0010] A constant current flash stimulator includes a main control module and a power management module, a TYPEC communication module, an LED driver module, a step-down module, and TYPEC pins respectively connected to the main control module. The LED driver module includes a driver chip and an LED.

[0011] The main control module is used to send drive commands to the drive chip, and the drive chip generates a level conversion signal to drive the LED to blink. The power management module supports TYPEC interface power supply and battery power supply. The main control module communicates with the PC through the TYPEC interface to perform more editable settings.

[0012] As a further technical solution of this utility model: the TYPEC communication module includes a CH340N chip, whose pin configuration is as follows:

[0013] Pin 5 (VCC) is connected to the 5V Type-C power supply and grounded through capacitor C12;

[0014] Pin 1 (UD+) and pin 2 (UD-) are used for USB data transfer;

[0015] Pins 6 (TXD) and 7 (RXD) are used for serial communication.

[0016] As a further technical solution of this utility model: the LED driver module includes an OC7141 chip, whose pin configuration is as follows:

[0017] Pin 1 (VDD) is connected to the VCC 5V power supply;

[0018] Pin 2 (DIM) is connected to the PA0 signal via resistor R35;

[0019] Pin 4 (CS) is connected to ground resistors R37 and R38 for current sensing.

[0020] As a further technical solution of this utility model: the main control module adopts an STM32F103C8T6 microcontroller, configured as follows:

[0021] The clock signal is connected to the crystal oscillator circuit;

[0022] The reset signal NRST is implemented through capacitor C3 and resistor R2.

[0023] In summary, this utility model has at least one of the following beneficial technical effects:

[0024] This utility model discloses a constant current flash stimulator, relating to the field of flash stimulator technology. The stimulator includes a power management module, a TYPEC communication module, an LED driver module, a step-down module, TYPEC pins, and a main control module. It employs a constant current chip to ensure brightness stability, supports multiple power supply methods to avoid power interference, and allows for adjustable parameters to improve accuracy. The processing method includes microcontroller signal transmission, constant current driving, and parameter adjustment steps. This utility model's constant current flash stimulator is convenient to operate, highly safe, and portable, making it suitable for medical or laboratory equipment.

[0025] Compared with the prior art, the output parameters of the stimulator can be adjusted, which is safe and avoids electric burns. Attached Figure Description

[0026] Figure 1 This is the circuit diagram of the STM32F103C8T6 microcontroller used in this invention.

[0027] Figure 2 This is a circuit diagram of the LED driving circuit in this invention.

[0028] Figure 3 This is a circuit diagram of the TYPEC interface circuit in this invention.

[0029] Figure 4 This is a circuit diagram of the voltage conversion circuit in this invention.

[0030] Figure 5 This is a circuit diagram of the TYPEC communication and its reset circuit in this invention.

[0031] Figure 6 This is a circuit diagram of the boost circuit in this invention.

[0032] Figure 7 This is a circuit diagram of the charging circuit in this invention. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Example 1:

[0037] Reference Figure 1-7 This utility model discloses a constant current flashing stimulator, including a main control module and a power management module, a TYPEC communication module, an LED driver module, a step-down module, and TYPEC pins respectively connected to the main control module. The LED driver module includes a driver chip and an LED. The main control module is used to send driving commands to the driver chip, and the driver chip generates a level conversion signal to drive the LED to flash. The power management module supports TYPEC interface power supply and battery power supply. The main control module communicates with the PC through the TYPEC interface to perform more editable settings.

[0038] The TYPEC communication module includes the CH340N chip, whose pin configuration is as follows: pin 5 (VCC) is connected to the 5V power supply of the type-c and grounded through capacitor C12; pin 1 (UD+) and pin 2 (UD-) are used for USB data transmission; pin 6 (TXD) and pin 7 (RXD) are used for serial communication.

[0039] The TYPEC communication module includes a TYPEC communication circuit, comprising:

[0040] CH340N chip power supply pins: Pin 5 (VCC) of the CH340N chip (U4) is connected to a Type-C 5V power supply and grounded through capacitor C12 (0.1μF) for power filtering; Pin 8 (V3) is grounded through capacitor C13 (0.1μF).

[0041] Data pins: Pin 1 (UD+) is connected to signal ch340 d+; Pin 2 (UD-) is connected to signal ch340 d- for USB data transfer.

[0042] Serial communication pins: Pin 6 (TXD) is used for data transmission, and pin 7 (RXD) is used for data reception.

[0043] Grounding pins: Both pin 3 (GND) and pin 4 (RTS#) are grounded.

[0044] Crystal Oscillator Circuit: 32.768kHz Crystal Oscillator (X2): One end is connected to signal OCS32-IN, and the other end is connected to signal OCS32-OUT. Capacitors C8 (20pF) and C9 (20pF) are connected between OCS32-IN, OCS32-OUT, and ground, respectively, to stabilize the oscillation. 8MHz Crystal Oscillator (X1): One end is connected to signal OCS-IN, and the other end is connected to signal OCS-OUT. Capacitors C10 (20pF) and C11 (20pF) are connected between OCS-IN, OCS-OUT, and ground, respectively. Resistor R5 (1MΩ) is also connected between OCS-IN and OCS-OUT, together forming the oscillation circuit.

[0045] Reset Circuit: In the reset circuit, one end of the push-button switch SW1 (SW-PB) is grounded, and the other end is connected to the NRST signal. Capacitor C3 (1μF) is connected between NRST and ground, and resistor R2 (10kΩ) is connected between VCC3.3 and NRST, acting as a pull-up resistor to achieve the reset function.

[0046] The LED driver module includes an OC7141 chip, with the following pin configuration: pin 1 (VDD) is connected to the VCC_5V power supply; pin 2 (DIM) is connected to the PA0 signal through resistor R35; and pin 4 (CS) is connected to ground resistors R37 and R38 for current detection.

[0047] The LED driver module includes an LED driver circuit, with a power supply connection of VCC_5V. The VCC_5V power supply is connected to multiple components. On one hand, it is grounded through capacitors C39 (47μF), C38 (0.1μF), and C37 (1μF) for filtering; on the other hand, it is connected to a 0Ω resistor R34 and one end of the LED connector JP1.

[0048] OC7141 chip (U2): Its pin 1 (VDD) is connected to VCC_5V to obtain the working power; pin 3 (GND) is directly grounded.

[0049] Brightness adjustment: Pin 2 (DIM) of the OC7141 chip is connected to the PA0 signal through a 10kΩ resistor R35, and grounded through a 1kΩ resistor R36 to receive the brightness adjustment signal.

[0050] Current detection: Pin 4 (CS) of the OC7141 chip is connected to one end of two 10Ω resistors R37 and R38, and the other end of these two resistors is grounded for current detection.

[0051] The main control module uses an STM32F103C8T6 microcontroller, configured as follows: the clock signal is connected to the crystal oscillator circuit; the reset signal NRST is implemented through capacitor C3 and resistor R2.

[0052] The main control module includes a main control circuit chip, U1. VDD_1 (pin 24), VDD_2 (pin 35), and VDD_3 (pin 48) are all connected to the VCC3 power supply, and are filtered by grounding through capacitor C4 (100nF), an unnumbered capacitor (assumed to be Cx, connected in the diagram as a similar configuration), C5 (100nF), and C6 (4.7μF), respectively. VSS_1 (pin 23), VSS_2 (pin 36), and VSS_3 (pin 46) are directly grounded. VBAT (pin 1) is connected to VCC3.3 through a 0Ω resistor R1. VDDA (pin 9) is connected to VCC3.3 and filtered by grounding through capacitors C1 (1μF) and C2 (10nF).

[0053] Clock signals: Connect PC14-OSC32_IN (pin 3) to signal OCS32-IN. Connect PC15-OSC32_OUT (pin 4) to signal OCS32-OUT. Connect PD0-OSC_IN (pin 5) to signal OCS-IN. Connect PD1-OSC_OUT (pin 6) to signal OCS-OUT.

[0054] Reset signal: The reset signal connection NRST (pin 7) is connected to the reset signal NRST.

[0055] General purpose pins: The general purpose pins PA0 (pin 10) are connected to signal PA0, and PA0-WKUP (pin 11) are also connected to PA0. The pins PA1-PA15 and PB0-PB15 have corresponding leads, such as PB3 (pin 38) and PA15 (pin 37), some of which can be used for function expansion or peripheral connection.

[0056] Debugging Interface: The debugging interface connects SWD (pin 34) and SWCLK (pin 37) for SWD debugging interface connection, enabling program download and debugging functions.

[0057] Serial communication: The serial communication connection TXD (pin 29) and RXD (pin 31) is used for serial communication to send and receive data.

[0058] LED indicator: Pin 28 (PA8) is connected to the anode of LED D7 through a 510Ω resistor R99. The cathode of D7 is connected to a 3.3V power supply. C4 (100nF) is connected in parallel with R99 to control the LED indicator.

[0059] The power management module includes a power supply circuit. The power input, DVCC 3.3, is connected to pin 3 (VIN) of the chip U5 (PW6276), and grounded through capacitors C25 (22μF) and CF1 (0.1μF) for filtering. The enable pin, connected to the inductor, is connected to pin 4 with a 100K resistor R32, and then to inductor L9 (2.2μH). The other end of the inductor is connected to DVCC 3.3. Pin 1 (EN) is connected to ground through resistor R33 (2.2Ω) and also grounded through capacitor C27 (4.7nF), used to control the chip's enable state.

[0060] The output is connected to pins 8 (VOUT) and 7 (VOUT) to output a 5V VOUT voltage. The output is filtered by grounding through capacitors CF2 (0.1μF) and C26 (22μF). A feedback circuit consisting of resistors R31 (310K) and R30 (100K) is also connected, with one end of R30 grounded and one end of R31 connected to VOUT 5V, with the middle connected to pin 5 (FB) to stabilize the output voltage. Pins 2 (LX), 5 (FB), 6 (CGND), and 9 (PGND) are all grounded. The power input is a Type-C 5V power supply connected to pin 4 (VCC) of the TP4056 (U5) chip, and grounded through capacitor C34 (10μF) for filtering. Pin 8 (CE) is also connected to a Type-C 5V power supply.

[0061] Battery connection pin 5 (BAT) is connected to the negative terminal of the lithium battery socket via capacitor C36 (10μF), providing a current path for battery charging. Status indicator pins 7 (CHRG) and 6 (STDBY) are connected to the anodes of LEDs D8 and D9, respectively, with the cathodes of both diodes grounded, indicating the charging status. Temperature and current setting pin 1 (TEMP) is grounded to monitor battery temperature. Pin 2 (PROG) is grounded via resistor R22 (2.2KΩ) to set the charging current.

[0062] Example 2:

[0063] This utility model also discloses a processing method for a constant current flash stimulator, applied to the stimulator of Embodiment 1, comprising the following steps:

[0064] Step 1: The microcontroller sends an enable signal to drive the chip to generate a PWM wave to drive the LED to blink.

[0065] Step 2: Use a constant current chip to provide the power supply current;

[0066] Step 3: Communicate with the PC via the TYPEC interface to adjust the brightness, frequency, and number of lights.

[0067] In this embodiment, the steps further include: initializing the power supply mode and selecting either a TYPEC interface or battery power. Parameter adjustment is achieved through a programmable microcontroller and design software. The microcontroller emits an enable signal to cause the LED driver to emit a PWM wave to drive the LED to blink. The signal is processed by a transistor and the driver chip, and the LED receives a stable power supply through a constant current chip. Multiple power supply methods are available, allowing for connection to the device or battery power. Using a programmable microcontroller in conjunction with the design software allows for complete control over brightness, frequency, and the number of lit LEDs.

[0068] The implementation principle of this utility model is as follows: This utility model discloses a constant current flash stimulator, relating to the field of flash stimulator technology. The stimulator includes a power management module, a TYPEC communication module, an LED driver module, a step-down module, TYPEC pins, and a main control module. It employs a constant current chip to ensure brightness stability, supports multiple power supply methods to avoid power interference, and allows for adjustable parameters to improve accuracy. The processing method includes microcontroller signal transmission, constant current driving, and parameter adjustment steps. This utility model's constant current flash stimulator is convenient to operate, highly safe, and portable, making it suitable for medical or experimental equipment.

[0069] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A constant current flash stimulator, characterized by, It includes a main control module and a power management module, a TYPEC communication module, an LED driver module, a DC-DC module, and a TYPEC interface, all connected to the main control module. The LED driver module includes a driver chip and LED driver pins. The main control module is used to send drive commands to the drive chip, and the drive chip generates a level conversion signal to drive the LED to blink. The power management module supports TYPEC interface power supply and battery power supply. The main control module communicates with the PC through the TYPEC interface to perform more editable settings.

2. A constant current flash stimulator according to claim 1, wherein, The TYPEC communication module includes a CH340N chip, whose pin configuration is as follows: Pin 5 (VCC) is connected to the TYPEC 5V power supply and grounded through capacitor C12; Pin 1 (UD+) and pin 2 (UD-) are used for USB data transfer; Pins 6 (TXD) and 7 (RXD) are used for serial communication.

3. A constant current flash stimulator according to claim 1, wherein, The LED driver module includes an OC7141 chip, whose pin configuration is as follows: Pin 1 (VDD) is connected to the VCC 5V power supply; Pin 2 (DIM) is connected to the PA0 signal via resistor R35; Pin 4 (CS) is connected to ground resistors R37 and R38 for current sensing.

4. A constant current flash stimulator according to claim 1, wherein, The main control module uses an STM32F103C8T6 microcontroller and is configured as follows: The clock signal is connected to the crystal oscillator circuit; The reset signal NRST is implemented through capacitor C3 and resistor R2.

Images