Pulse signal collecting and transmitting circuit

Abstract

The utility model belongs to the technical field of medical equipment, and particularly discloses a pulse signal collecting and transmitting circuit which comprises a power management module, a limit switch module, an analog-to-digital conversion module, a communication interface module, a motor driving module and a micro-control unit module. The communication interface module and the motor driving module are grounded and isolated; the power supply management module is connected with the power supply input ends of other modules respectively; the driving signal output end of the micro-control unit module is connected with the driving signal input end of an external stepping motor through the motor driving module. An analog signal input end of the analog-to-digital conversion module is connected with an output end of an external sensor circuit, and a digital signal output end of the analog-to-digital conversion module is connected with a digital signal input end of the micro-control unit module; the limit switch module is connected with a switch signal input end of the micro-control unit module; and the micro-control unit module is in communication connection with external equipment through the communication interface module. The pulse signal acquisition and transmission device can improve the efficiency and accuracy of pulse signal acquisition and transmission, and is suitable for traditional Chinese medicine pulse diagnosis.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, and in particular relates to a pulse signal collection and transmission circuit. Background Art

[0002] Pulse is an important basis for TCM diagnosis of diseases. Accurate pulse classification can provide strong technical support for doctors' subsequent diagnosis. The premise of accurate pulse classification is accurate collection and transmission of pulse signals.

[0003] Pulse signal acquisition technology is a key link in digital diagnosis of traditional Chinese medicine. Its signal quality directly affects the accuracy of pulse classification. The existing pulse signal acquisition circuit has the problem of low acquisition and transmission accuracy. One of the important reasons for this phenomenon is environmental interference. For example, environmental electromagnetic interference (such as 50Hz power frequency noise) will be superimposed on the microvolt pulse signal. Summary of the invention

[0004] The purpose of the utility model is to provide a pulse signal collection and transmission circuit, so as to be able to efficiently and accurately collect and transmit the pulse signal.

[0005] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0006] A pulse signal acquisition and transmission circuit includes a power management module, a limit switch module, an analog-to-digital conversion module, a communication interface module, a motor drive module and a micro control unit module; the communication interface module is grounded and isolated from the motor drive module;

[0007] The power management module is connected to the power input terminals of the limit switch module, the analog-to-digital conversion module, the communication interface module, the motor drive module and the micro control unit module respectively;

[0008] The drive signal output terminal of the micro control unit module is connected to the drive signal input terminal of the external stepper motor through the motor drive module. The micro control unit module outputs the drive signal from the drive signal output terminal, and further outputs the drive signal to the external stepper motor through the motor drive module.

[0009] The analog signal input end of the analog-to-digital conversion module is connected to the output end of the external sensor circuit, and the digital signal output end is connected to the digital signal input end of the micro control unit module; the analog-to-digital conversion module receives the pulse analog signal collected by the external sensor circuit, performs analog-to-digital conversion, and outputs the obtained pulse digital signal to the micro control unit;

[0010] The limit switch module is connected to the switch signal input terminal of the micro control unit module; the limit switch module monitors the limit position of the external stepper motor in real time and feeds the result back to the micro control unit module;

[0011] The micro - control unit module is communicatively connected to external devices through the communication interface module.

[0012] As a limitation, the power management module includes a primary BUCK circuit, a first - stage BUCK circuit, a second - stage LDO circuit, a second - stage power supply circuit, a third - stage negative power supply, and a second - stage power supply;

[0013] The primary BUCK circuit inputs a voltage of 9 - 16V and outputs a voltage of 6V to supply power to the second - stage LDO circuit, the second - stage power supply circuit, and the second - stage power supply;

[0014] The first - stage BUCK circuit inputs a voltage of 12V and outputs a voltage of 5V to supply power to the motor drive module;

[0015] The second - stage LDO circuit inputs a voltage of 6V and outputs a voltage of 5V to supply power to the analog - to - digital conversion module;

[0016] The second - stage power supply circuit inputs a voltage of 6V and generates a voltage of - 6V to supply power to the third - stage negative power supply;

[0017] The third - stage negative power supply inputs a voltage of - 6V and outputs a voltage of - 5V to provide negative power to the connected external sensor circuit and amplifier circuit;

[0018] The second - stage power supply inputs a voltage of 6V and outputs a voltage of 3.3V to supply power to the micro - control unit module and other chips.

[0019] As a second limitation, the communication interface module includes an RS232 communication circuit for debugging and development, a USB communication circuit for uploading raw pulse data, and a serial - to - USB circuit for receiving and sending control instructions.

[0020] As a third limitation, the limit switch module includes three groups of photoelectric limit switches.

[0021] As a fourth limitation, the analog - to - digital conversion module includes three - channel ADC acquisition circuits.

[0022] Due to the adoption of the above - mentioned technical solutions, compared with the prior art, the technical progress achieved by the present utility model lies in:

[0023] (1) The present utility model isolates the communication interface module and the motor drive module from ground, which can effectively isolate the interference of environmental noise or human movement, and collect and transmit pulse signals efficiently and accurately;

[0024] (2) The present utility model arranges multiple - stage power supplies reasonably, which can improve the reliability of the whole circuit;

[0025] (3) Through the optimized signal conditioning and transmission design, the present utility model can collect and transmit pulse signals efficiently and accurately, and is applicable to portable medical devices and health monitoring products;

[0026] (4) The utility model is connected to the drive signal input end of an external stepper motor through a motor drive module to drive the external stepper motor, thereby controlling the pressure sensor of the external sensor circuit to press down, simulating different forces applied during pulse diagnosis. At the same time, an optoelectronic limit switch is set to monitor the position of the external stepper motor in real time, preventing it from moving to the limit position and improving the sensitivity.

[0027] (5) The circuit structure of the utility model is simple and the cost is low, which is suitable for large-scale industrial production.

[0028] The utility model belongs to the technical field of medical equipment and can efficiently and accurately collect and transmit pulse signals. Brief Description of the Drawings

[0029] The drawings are used to provide a further understanding of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the utility model and do not constitute a limitation to the utility model.

[0030] In the drawings:

[0031] Figure 1 is the principle block diagram of the pulse signal acquisition and transmission circuit of the embodiment of the utility model connected to an external stepper motor and a sensor;

[0032] Figure 2 is the circuit schematic diagram of the primary BUCK circuit in the embodiment of the utility model;

[0033] Figure 3 is the circuit schematic diagram of the first-stage BUCK circuit in the embodiment of the utility model;

[0034] Figure 4 is the circuit schematic diagram of the secondary LDO circuit in the embodiment of the utility model;

[0035] Figure 5 is the circuit schematic diagram of the secondary power supply circuit in the embodiment of the utility model;

[0036] Figure 6 is the circuit schematic diagram of the tertiary negative power supply in the embodiment of the utility model;

[0037] Figure 7 is the circuit schematic diagram of the secondary power supply circuit in the embodiment of the utility model;

[0038] Figure 8 is the circuit schematic diagram of the RS232 communication circuit in the embodiment of the utility model;

[0039] Figure 9 is the circuit schematic diagram of the USB communication circuit in the embodiment of the utility model;

[0040] Figure 10 This is a circuit schematic diagram of a serial port to USB circuit in an embodiment of the utility model;

[0041] Figure 11 This is a circuit schematic diagram of a micro control unit module in an embodiment of the utility model;

[0042] Figure 12 This is a circuit schematic diagram of the motor drive module in the embodiment of the utility model;

[0043] Figure 13 This is a circuit schematic diagram of the analog-to-digital conversion module in the embodiment of the utility model;

[0044] Figure 14 The figure is a circuit diagram of the limit switch module in the embodiment of the utility model. DETAILED DESCRIPTION

[0045] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0046] Example

[0047] This embodiment provides a pulse signal collection and transmission circuit. Figure 1 As shown, this embodiment includes a power management module, a limit switch module, an analog-to-digital conversion module, a communication interface module, a motor drive module and a micro control unit module. The communication interface module is grounded and isolated from the motor drive module.

[0048] The power management module is connected to the power input terminals of the limit switch module, the analog-to-digital conversion module, the communication interface module, the motor drive module and the micro control unit module respectively. The drive signal output terminal of the micro control unit module is connected to the drive signal input terminal of the external stepper motor through the motor drive module. The micro control unit module outputs the drive signal from the drive signal output terminal, and further outputs the drive signal to the external stepper motor through the motor drive module. The analog signal input terminal of the analog-to-digital conversion module is connected to the output terminal of the external sensor circuit, and the digital signal output terminal is connected to the digital signal input terminal of the micro control unit module; the analog-to-digital conversion module receives the pulse analog signal collected by the external sensor circuit, and outputs the obtained pulse digital signal to the micro control unit after analog-to-digital conversion. The limit switch module is connected to the switch signal input terminal of the micro control unit module; the limit switch module monitors the limit position of the external stepper motor in real time, and feeds back the result to the micro control unit module. The micro control unit module is connected to the external device through the communication interface module.

[0049] The external sensor circuit includes a pressure sensor. In this embodiment, the motor drive module is connected to the drive signal input terminal of the external stepper motor to drive the external stepper motor, and then control the pressure sensor of the external sensor circuit to press down, simulating different forces applied during pulse diagnosis. At the same time, the optoelectronic limit switch in the limit switch module is set to monitor the position of the external stepper motor in real time to prevent it from moving to the limit position.

[0050] As Figure 1 shown, the power management module includes a primary BUCK circuit, a first-stage BUCK circuit, a second-stage LDO circuit, a second-stage power supply circuit, a third-stage negative power supply, and a second-stage power supply. Among them, A is the primary BUCK circuit, B is the first-stage BUCK circuit, C is the second-stage LDO circuit, D is the second-stage power supply circuit, E is the third-stage negative power supply, and F is the second-stage power supply.

[0051] The primary BUCK circuit inputs a voltage of 9 - 16V and outputs a voltage of 6V to supply power to the second-stage LDO circuit, the second-stage power supply circuit, and the second-stage power supply. As Figure 2 shown, it is the circuit schematic diagram of the primary BUCK circuit.

[0052] The first-stage BUCK circuit inputs a voltage of 12V and outputs a voltage of 5V to supply power to the motor drive module. As Figure 3 shown, it is the circuit schematic diagram of the first-stage BUCK circuit.

[0053] The second-stage LDO circuit inputs a voltage of 6V and outputs a voltage of 5V to supply power to the analog-to-digital conversion module. As Figure 4 shown, it is the circuit schematic diagram of the second-stage LDO circuit.

[0054] The second-stage power supply circuit inputs a voltage of 6V and generates a voltage of -6V to supply power to the third-stage negative power supply. As Figure 5 shown, it is the circuit schematic diagram of the second-stage power supply circuit.

[0055] The third-stage negative power supply inputs a voltage of -6V and outputs a voltage of -5V to provide negative power to the connected external sensor circuit and amplifier circuit. As Figure 6 shown, it is the circuit schematic diagram of the third-stage negative power supply.

[0056] The second-stage power supply inputs a voltage of 6V and outputs a voltage of 3.3V to supply power to the micro control unit module and other chips. As Figure 7 shown, it is the circuit schematic diagram of the second-stage power supply.

[0057] In this embodiment, the communication interface module includes an RS232 communication circuit for debugging and development, a USB communication circuit for uploading raw pulse data, and a serial-to-USB circuit for receiving and sending control instructions. As Figure 8 shown, it is the circuit schematic diagram of the RS232 communication circuit, Figure 9It is the circuit schematic diagram of the USB communication circuit, Figure 10 and it is the circuit schematic diagram of the serial port to USB circuit.

[0058] The microcontroller unit module uses a circuit with the GD32F470VG chip as the core. The circuit schematic diagram is as Figure 11 shown.

[0059] In this embodiment, the motor drive module uses a three-channel stepper motor drive circuit. The circuit schematic diagram is as Figure 12 shown.

[0060] The analog-to-digital conversion module includes three-channel ADC acquisition circuits for collecting three-channel pulse signals. The circuit schematic diagram is as Figure 13 shown. The limit switch module includes three groups of photoelectric limit switches for monitoring the extreme positions of the motor. The circuit schematic diagram is as Figure 14 shown.

Claims

1. A pulse signal collection and transmission circuit, characterized in that: It includes a power management module, a limit switch module, an analog-to-digital conversion module, a communication interface module, a motor drive module, and a microcontroller unit module; the communication interface module is galvanically isolated from the motor drive module. The power management module is respectively connected to the power input terminals of the limit switch module, the analog-to-digital conversion module, the communication interface module, the motor drive module, and the microcontroller unit module. The drive signal output terminal of the microcontroller unit module is connected to the drive signal input terminal of the external stepper motor through the motor drive module. The microcontroller unit module outputs a drive signal from the drive signal output terminal and further outputs the drive signal to the external stepper motor through the motor drive module. The analog signal input terminal of the analog-to-digital conversion module is connected to the output terminal of the external sensor circuit, and the digital signal output terminal is connected to the digital signal input terminal of the microcontroller unit module; the analog-to-digital conversion module receives the pulse analog signal collected by the external sensor circuit, performs analog-to-digital conversion, and then outputs the obtained pulse digital signal to the microcontroller unit. The limit switch module is connected to the switch signal input terminal of the microcontroller unit module; the limit switch module monitors the limit position of the external stepper motor in real time and feeds back the result to the microcontroller unit module. The microcontroller unit module is communicatively connected to an external device through the communication interface module.

2. The pulse signal acquisition and transmission circuit according to claim 1, characterized in that: The power management module includes a primary BUCK circuit, a first-stage BUCK circuit, a second-stage LDO circuit, a second-stage power supply circuit, a third-stage negative power supply, and a second-stage power supply. The primary BUCK circuit inputs a voltage of 9 - 16V and outputs a voltage of 6V to supply power to the second-stage LDO circuit, the second-stage power supply circuit, and the second-stage power supply. The first-stage BUCK circuit inputs a voltage of 12V and outputs a voltage of 5V to supply power to the motor drive module. The second-stage LDO circuit inputs a voltage of 6V and outputs a voltage of 5V to supply power to the analog-to-digital conversion module. The second-stage power supply circuit inputs a voltage of 6V and generates a voltage of -6V to supply power to the third-stage negative power supply. The third-stage negative power supply inputs a voltage of -6V and outputs a voltage of -5V to provide a negative power supply for the connected external sensor circuit and amplifier circuit. The second-stage power supply inputs a voltage of 6V and outputs a voltage of 3.3V to supply power to the microcontroller unit module and other chips.

3. The pulse signal acquisition and transmission circuit according to claim 1 or 2, characterized in that: The communication interface module includes an RS232 communication circuit for debugging and development, a USB communication circuit for uploading raw pulse data, and a serial-to-USB circuit for receiving and sending control instructions.

4. The pulse signal acquisition and transmission circuit according to claim 1 or 2, characterized in that: The limit switch module includes three groups of optoelectronic limit switches.

5. The pulse signal acquisition and transmission circuit according to claim 1 or 2, characterized in that: The analog-to-digital conversion module includes three-channel ADC acquisition circuits.

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