CN218067741U - Wearable sweat collection circuit and device based on multi-parameter electrochemistry - Google Patents
Wearable sweat collection circuit and device based on multi-parameter electrochemistry Download PDFInfo
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- CN218067741U CN218067741U CN202221103396.9U CN202221103396U CN218067741U CN 218067741 U CN218067741 U CN 218067741U CN 202221103396 U CN202221103396 U CN 202221103396U CN 218067741 U CN218067741 U CN 218067741U
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Abstract
The utility model discloses a wearable sweat collection circuit of multi-parameter and device based on electrochemistry, this circuit includes: the power supply comprises a front-end analog circuit, a conversion circuit, a microcontroller circuit and a power supply management circuit, wherein the front-end analog circuit, the conversion circuit, the microcontroller circuit and the power supply management circuit are sequentially connected, and the power supply management circuit is also respectively connected with the front-end analog circuit and the conversion circuit. The utility model provides a data acquisition circuit and device has realized gathering in real time and has handled sweat multi-parameter ion data, carries out effectual conversion, merger and transmission to data and handles, has not only guaranteed output signal's the degree of accuracy and stability. The design concept of a new integrated circuit is provided, the integration level of the circuit is improved, and the circuit has a good application prospect.
Description
Technical Field
The utility model belongs to wearable check out test set field, in particular to based on wearable sweat collection circuit of multi-parameter electrochemistry and device.
Background
In recent years, with the continuous improvement of the living standard of China, the risk of chronic diseases is increased, and the probability of sudden death of exercise is increased for part of chronic diseases, so that the real-time monitoring of the physical condition during exercise is very important. Traditional clinical medical diagnosis relies on invasive blood analysis, expensive instruments and no real-time monitoring of the health status of an individual. In recent years, the development of intelligent wearable equipment is promoted due to the appearance of the internet of things, meanwhile, the sweat is noninvasive, easy to obtain and can be continuously detected in real time, and the sweat becomes an ideal detection object of a wearable device due to the characteristics. By analyzing the change of each index in sweat, the change of the health condition of the body of a person during exercise can be better understood. However, there are still some technical problems and challenges with current wearable sweat detection devices, particularly circuit configurations, including: (1) The traditional sweat collection process is complex and inefficient, the collection precision needs to be improved, and no standardized equipment and quantitative indexes exist; (2) When ions in sweat are detected, the traditional ion sensor cannot be integrated into a wearable device due to large volume and complex process; (3) The wearable device of traditional sweat multi-parameter collection is bulky, and the consumption is big, is not convenient for the experimenter to dress and can not be long-time continuous real-time collection sweat sample. The above problems not only affect the characteristics of convenience and real-time continuity of sweat detection, but also severely limit the in-depth research on the obtained sweat and components.
Therefore, how to realize simple circuit structure and small volume in the wearable sweat detection device and keep higher data acquisition precision and use time is a problem that needs to be solved urgently by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks of the prior art, in order to achieve the above-mentioned object, the present invention provides in one aspect the following solutions:
an electrochemical-based multi-parameter wearable sweat collection circuit, comprising: the device comprises a front-end analog circuit, a conversion circuit, a microcontroller circuit and a power management circuit; wherein the front-end analog circuit, the conversion circuit, the microcontroller circuit and the power management circuit are connected in sequence, the power management circuit is also connected with the front-end analog circuit and the conversion circuit respectively,
the front-end analog circuit is used for collecting voltage signals and current signals in sweat and sending the collected voltage signals and current signals to the conversion circuit;
the conversion circuit is used for generating reference voltage required by electrochemical measurement, carrying out differential processing on the acquired voltage signal and current signal, and sending the data after the differential processing to the microcontroller circuit;
the microcontroller circuit is used for controlling the D/A conversion circuit to provide reference voltage for the front-end analog circuit and controlling the A/D conversion circuit to process and convert voltage signals and current signals acquired by the front-end analog circuit;
and the power management circuit is used for supplying power to the circuits.
Preferably, the conversion circuit includes an a/D conversion circuit and a D/a conversion circuit, the a/D conversion circuit includes an AD7124-4 chip, and the D/a conversion circuit includes an AD5623 chip.
Preferably, the front-end analog circuit comprises an open-circuit potential acquisition circuit and a potentiostat circuit,
the output end of the open circuit potential acquisition circuit is connected with pins No. 10, 11, 14 and 15 of the AD7124-4 chip; the output end of the potentiostat circuit is connected with No. 8 and No. 16 pins of an AD7124-4 chip of the conversion circuit;
the potential acquisition circuit acquires voltage signals and current signals in sweat by an open circuit potential-time curve method and sends the acquired data to the conversion circuit;
the potentiostat circuit collects voltage signals and current signals in sweat by adopting a time-current curve method, and sends the collected data to the conversion circuit.
Preferably, the open circuit potential acquisition circuit comprises a 1 st resistor, a 2 nd resistor, a 3 rd resistor, a4 th resistor, a 1 st operational amplifier, a 2 nd operational amplifier, a 3 rd operational amplifier and a4 th operational amplifier,
the collection end SE1 is connected with the anode of the 1 st operational amplifier through the 1 st resistor, the cathode of the 1 st operational amplifier is connected with the output end of the 1 st operational amplifier, and the output end of the 1 st operational amplifier is connected with the No. 10 pin of the AD7124-4 chip; the collection end SE2 is connected with the anode of the 2 nd operational amplifier through the 2 nd resistor, the cathode of the 2 nd operational amplifier is connected with the output end of the 2 nd operational amplifier, and the output end of the 2 nd operational amplifier is connected with the No. 11 pin of the AD7124-4 chip; the acquisition end SE3 is connected with the anode of the 3 rd operational amplifier through the 3 rd resistor, the cathode of the 3 rd operational amplifier is connected with the output end of the acquisition end SE3, and the output end of the 3 rd operational amplifier is connected with the No. 14 pin of the AD7124-4 chip; the 4 th resistor is connected with the anode of the 4 th operational amplifier, the cathode of the 4 th operational amplifier is connected with the output end of the 4 th operational amplifier, and the output end of the 4 th operational amplifier is connected with the constant potential rectifier circuit.
Preferably, the potentiostat circuit comprises a 5 th resistor, a 6 th resistor, a 12 th resistor, a 13 th resistor, a 14 th resistor, a 15 th resistor, a 16 th resistor, a 17 th resistor, a 5 th operational amplifier, a 6 th operational amplifier, a 7 th operational amplifier, an 8 th operational amplifier,
the 4 th operational amplifier output end is connected with the 5 th operational amplifier positive electrode through a 14 th resistor, RE1 is connected with the 5 th operational amplifier negative electrode through a 12 th resistor, and the RE1, the 5 th operational amplifier output end CE1 and the 6 th operational amplifier WE1 end form a 1 st group of third electrode system; the 6 th operational amplifier cathode is connected with the output end of the AD7124-4 chip through a 5 th resistor, the 6 th operational amplifier anode is connected with the No. 9 pin of the AD7124-4 chip through a 15 th resistor, and the 6 th operational amplifier output end is connected with the No. 8 pin of the AD7124-4 chip; the 4 th operational amplifier output end is connected with the 7 th operational amplifier positive electrode through a 16 th resistor, the RE2 is connected with the 6 th operational amplifier negative electrode through a 13 th resistor, and the RE2, the 7 th operational amplifier output end CE2 and the WE2 end of the 8 th operational amplifier form a 2 nd group of third electrode system; the 8 th operational amplifier negative electrode is connected with the output end of the AD7124-4 chip through a 6 th resistor, the 8 th operational amplifier positive electrode is connected with the No. 17 pin of the AD7124-4 chip through a 17 th resistor, and the 8 th operational amplifier output end is finally connected with the No. 16 pin of the AD7124-4 chip.
Preferably, the pins 2 and 1 of the AD7124-4 chip are respectively connected with the pins 7 and 8 of the AD5623 chip, and the pins 1, 2, 4 and 24 of the AD7124-4 chip of the conversion circuit are connected with the microcontroller circuit.
Preferably, the microcontroller circuit comprises an MCU and a Bluetooth module, wherein the MCU is connected with the Bluetooth module,
the MCU is used for controlling the A/D conversion circuit and the D/A conversion circuit to process data acquired by the front end and controlling the analog power supply LDO module to supply power to the front end analog circuit, the A/D conversion circuit and the D/A conversion circuit, and is also used for running a protocol stack program required by Bluetooth communication;
the Bluetooth module is used for transmitting data.
Preferably, the MCU comprises a CC2640R2F chip, and pins 1, 2, 36, 28, 29, 31 and 33 of the CC2640R2F chip are respectively connected with pins 5, 4 and 6 of the AD5623 and pins 24, 4, 1 and 2 of the AD 7124-4.
Preferably, the power management circuit comprises a lithium ion battery, an analog power supply LDO module and a digital power supply LDO module, and the lithium ion battery is respectively connected with the analog power supply LDO module and the digital power supply LDO module;
the analog power supply LDO module comprises an ADP1711AUJZ-3.3-R7 chip, a VCC power supply is provided through a No. 5 power supply output pin and is respectively connected with the front end analog circuit and the conversion circuit, the digital power supply LDO module comprises a TPS79933DDCT chip, a DVDD power supply is provided through a No. 5 power supply output pin and is connected with the microcontroller circuit, and a No. 24 pin of the Bluetooth chip and the analog power supply LDO module enable a No. 3 pin EN to be connected.
The utility model also provides a wearable sweat collection device of multi-parameter based on electrochemistry on another aspect, including as aforementioned wearable sweat collection circuit converting circuit of multi-parameter based on electrochemistry.
The utility model has the advantages that:
based on the defect that prior art exists, the utility model provides a based on wearable sweat collection equipment of multi-parameter electrochemistry and device can accurately gather electrochemical sensor's open circuit electric potential and constant potential rectifier circuit current in succession to the multichannel signal of telecommunication that will gather, the transmission realizes real time monitoring for mobile device. The circuit is simple and efficient, so that the size of the device is greatly reduced; the front-end analog circuit part with five channels is integrated in four operational amplifiers ADA4505-2ARMZ-RL chips, so that the integration level of the chips is greatly improved; the sweat concentration monitoring device has the collection resolution as low as 1 Muv and 1nA, achieves higher collection precision, and monitors the change of the concentration of each ion of sweat in real time for a long time by being worn on the body of a person, thereby monitoring the change of the health condition of the body during exercise.
Drawings
FIG. 1 is a schematic diagram of the main circuit connection structure of the present invention;
fig. 2 is a schematic diagram of the connection structure of the open circuit potential acquisition circuit of the present invention;
FIG. 3 is a schematic diagram of the potentiostat circuit connection structure of the present invention;
FIG. 4 is a schematic diagram of the AD7124-4 chip connection structure of the conversion circuit of the present invention;
fig. 5 is a schematic diagram of the connection structure of the AD5623 chip of the conversion circuit of the present invention;
fig. 6 is a schematic circuit diagram of the analog power supply LDO module of the present invention;
fig. 7 is the circuit schematic diagram of the digital power supply LDO module of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
Furthermore, the descriptions of the present invention referring to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
It should be noted that, in the practical application of the present invention, the software program is inevitably applied, but the applicant states here that the software program applied in the embodiment is the prior art, and in the present application, the modification and protection of the software program are not involved, but only the protection of the hardware architecture designed for the purpose of the present invention.
Example (b):
an embodiment of the present invention provides an electrochemical-based wearable sweat collection circuit with multiple parameters, please refer to fig. 1, and fig. 1 is a schematic circuit diagram of a first embodiment of an electrochemical-based wearable sweat collection circuit with multiple parameters. The method comprises the following steps: the device comprises a front-end analog circuit, a conversion circuit, a microcontroller circuit and a power management circuit; wherein the front-end analog circuit, the conversion circuit, the microcontroller circuit and the power management circuit are connected in sequence, the power management circuit is also connected with the front-end analog circuit and the conversion circuit respectively,
the front-end analog circuit is used for collecting voltage signals and current signals in sweat and sending the collected voltage signals and current signals to the conversion circuit;
the conversion circuit is used for generating reference voltage required by electrochemical measurement, carrying out differential processing on the acquired voltage signal and current signal, and sending the data after the differential processing to the microcontroller circuit;
the microcontroller circuit is used for controlling the D/A conversion circuit to provide reference voltage for the front-end analog circuit and controlling the A/D conversion circuit to process and convert voltage signals and current signals acquired by the front-end analog circuit;
and the power management circuit is used for supplying power to the circuits.
Preferably, the conversion circuit includes an a/D conversion circuit and a D/a conversion circuit, the a/D conversion circuit includes an AD7124-4 chip, and the D/a conversion circuit includes an AD5623 chip.
Preferably, the open-circuit potential acquisition circuit comprises a voltage follower circuit SE1, a voltage follower circuit SE2, a voltage follower circuit SE3 and a voltage follower circuit RE; the potentiostat circuit comprises a first potentiostat circuit and a second potentiostat circuit.
Preferably, the front-end analog circuit comprises an open-circuit potential acquisition circuit and a potentiostat circuit,
the output end of the open circuit potential acquisition circuit is connected with pins No. 10, 11, 14 and 15 of the AD7124-4 chip; the output end of the potentiostat circuit is connected with No. 8 and No. 16 pins of an AD7124-4 chip of the conversion circuit;
the potential acquisition circuit acquires voltage signals and current signals in sweat by an open circuit potential-time curve method and sends the acquired data to the conversion circuit;
the potentiostat circuit collects voltage signals and current signals in sweat by adopting a time-current curve method, and sends the collected data to the conversion circuit.
Preferably, the open circuit potential acquisition circuit comprises a 1 st resistor, a 2 nd resistor, a 3 rd resistor, a4 th resistor, a 1 st operational amplifier, a 2 nd operational amplifier, a 3 rd operational amplifier and a4 th operational amplifier,
the acquisition end SE1 is connected with the anode of the 1 st operational amplifier through the 1 st resistor, the cathode of the 1 st operational amplifier is connected with the output end of the 1 st operational amplifier, and the output end of the 1 st operational amplifier is connected with the No. 10 pin of the AD7124-4 chip; the collection end SE2 is connected with the anode of the 2 nd operational amplifier through the 2 nd resistor, the cathode of the 2 nd operational amplifier is connected with the output end of the 2 nd operational amplifier, and the output end of the 2 nd operational amplifier is connected with the No. 11 pin of the AD7124-4 chip; the acquisition end SE3 is connected with the anode of the No. 3 operational amplifier through the No. 3 resistor, the cathode of the No. 3 operational amplifier is connected with the output end of the No. 3 operational amplifier, and the output end of the No. 3 operational amplifier is connected with a No. 14 pin of the AD7124-4 chip; the 4 th resistor is connected with the anode of the 4 th operational amplifier, the cathode of the 4 th operational amplifier is connected with the output end of the 4 th operational amplifier, and the output end of the 4 th operational amplifier is connected with the constant potential rectifier circuit.
In the open-circuit potential acquisition circuit, SE1, SE2 and SE3 are ISE (ion selective electrodes) and respectively form a two-electrode system with RE (reference electrode), SE1, SE2, SE3 and RE are respectively connected to a voltage follower in the circuit, and the voltage follower is formed by a high-input impedance and low-power consumption operational amplifier and plays a role of impedance conversion. The D/A conversion circuit outputs 1.25V reference voltage, and the reference voltage is supplied to a voltage follower connected with RE, so that the potential of RE (reference electrode) is fixed at 1.25V, the voltage measurement range between SE 1-SE 3 and RE is-1.25-2.05V, the resolution is 1 Muv, and higher acquisition precision is achieved.
Preferably, the potentiostat circuit comprises a 5 th resistor, a 6 th resistor, a 12 th resistor, a 13 th resistor, a 14 th resistor, a 15 th resistor, a 16 th resistor, a 17 th resistor, a 5 th operational amplifier, a 6 th operational amplifier, a 7 th operational amplifier, an 8 th operational amplifier,
the 4 th operational amplifier output end is connected with the 5 th operational amplifier positive electrode through a 14 th resistor, RE1 is connected with the 5 th operational amplifier negative electrode through a 12 th resistor, and the RE1, the 5 th operational amplifier output end CE1 and the 6 th operational amplifier WE1 end form a 1 st group of third electrode system; the 6 th operational amplifier cathode is connected with the output end of the AD7124-4 chip through a 5 th resistor, the 6 th operational amplifier anode is connected with the No. 9 pin of the AD7124-4 chip through a 15 th resistor, and the 6 th operational amplifier output end is connected with the No. 8 pin of the AD7124-4 chip; the 4 th operational amplifier output end is connected with the 7 th operational amplifier positive electrode through a 16 th resistor, the RE2 is connected with the 6 th operational amplifier negative electrode through a 13 th resistor, and the RE2, the 7 th operational amplifier output end CE2 and the WE2 end of the 8 th operational amplifier form a 2 nd group of third electrode system; the 8 th operational amplifier negative electrode is connected with the output end of the AD7124-4 chip through a 6 th resistor, the 8 th operational amplifier positive electrode is connected with the No. 17 pin of the AD7124-4 chip through a 17 th resistor, and the 8 th operational amplifier output end is finally connected with the No. 16 pin of the AD7124-4 chip.
The front-end analog circuit comprises a first potentiostat circuit and a second potentiostat circuit, each potentiostat circuit being connectable to a set of three-electrode systems (WE, CE, RE) as in fig. 3 for electrochemical current measurement. The multichannel DA conversion circuit outputs two voltages (VREF 1 and VREF 2) to the potentiostat circuit respectively to control the potential difference between each potentiostat WE and RE, the potentiostat circuit further comprises a current-voltage conversion circuit, the current flowing through WE is converted into a corresponding voltage value and is sent to the AD conversion circuit, the current range is-10 muA, the resolution ratio is 1nA, and higher acquisition precision is achieved.
The utility model discloses in, provide the front end analog circuit part of five passageways, integrated in four fortune put ADA4505-2ARMZ-RL chips, improved the integrated level of chip greatly.
Preferably, referring to fig. 4 and 5, the conversion circuit further includes an AD5623 chip of the D/a conversion circuit, the conversion circuit is connected to pins 7 and 8 of the AD5623 chip through pins 2 and 1 of the AD7124-4 chip, so that the microcontroller circuit controls the AD7124-4 chip and the AD5623 chip simultaneously, and the pins 1, 2, 4 and 24 of the AD7124-4 chip of the conversion circuit are connected to the microcontroller circuit and use SPI communication.
In this embodiment, the relationship between the collected electrical signal and the concentration of the ions to be detected conforms to the nernst equation, and the concentration of each ion in sweat can be accurately detected at the same time. The multichannel A/D conversion circuit receives the electric signals collected by the front-end sensor at the same time through multiple channels, the received working electrode potential and the reference electrode potential are processed in a differential mode, and the processed data of the five channels are specifically three-channel potential and two-channel current. The multi-channel A/D conversion circuit comprises at least eight differential acquisition channels for inputting voltage signals output by the front-end electric analog circuit, and the multi-channel D/A conversion circuit provides reference voltage for the constant potential rectifier circuit and forms stable voltage difference with reference electrode voltage processed by the voltage follower so as to convert current flowing through the constant resistor by the working electrode. The input signal of the multi-channel A/D conversion circuit is a voltage signal output by a front-end analog circuit, wherein the reference electrode potential and the working electrode potential which are processed by a voltage follower are output to a channel of the multi-channel A/D conversion circuit by an open-circuit voltage acquisition circuit; the output of the constant potential rectifier circuit is the voltage obtained after conversion of the operation adder, the difference between the voltage and the reference voltage provided by the multi-channel D/A conversion circuit is the voltage on the constant resistor (the 5 th resistor and the 6 th resistor), and the ratio of the voltage to the resistor can obtain the current flowing through the constant resistor.
The MCU in the microcontroller circuit controls the multi-channel A/D conversion circuit to differentiate the voltage values acquired by the specified channels through an SPI protocol, and specifically differentiates the acquired voltages of the three channels with the voltage of the same reference electrode; and the voltage converted by the constant potential rectifier circuit operation adder and the multichannel D/A conversion circuit provide a reference voltage difference. The multi-channel A/D conversion circuit converts the multi-channel collected potential difference into voltage data of three channels and current data of two channels.
Preferably, the pins 2 and 1 of the AD7124-4 chip are respectively connected with the pins 7 and 8 of the AD5623 chip, and the pins 1, 2, 4 and 24 of the AD7124-4 chip of the conversion circuit are connected with the microcontroller circuit.
Preferably, the microcontroller circuit comprises an MCU and a Bluetooth module, wherein the MCU is connected with the Bluetooth module,
the MCU is used for controlling the A/D conversion circuit and the D/A conversion circuit to process data acquired by the front end, controlling the analog power supply LDO module to supply power to the front end analog circuit, the A/D conversion circuit and the D/A conversion circuit, and running a protocol stack program required by Bluetooth communication;
the Bluetooth module is used for transmitting data.
Preferably, the MCU comprises a CC2640R2F chip, and pins 1, 2, 36, 28, 29, 31 and 33 of the CC2640R2F chip are respectively connected with pins 5, 4 and 6 of the AD5623 and pins 24, 4, 1 and 2 of the AD 7124-4.
In this embodiment, the microcontroller circuit MCU acquires data of the a/D conversion circuit through the SPI (serial peripheral interface) and controls the multi-channel D/a conversion circuit to supply the reference voltage. And the Bluetooth antenna in the microcontroller circuit is used for transmitting the data to the mobile phone to be displayed on a screen of the mobile phone in real time. The GPIO port of the Bluetooth chip is connected with the A/D conversion module and the D/A conversion module respectively, and controls the multichannel A/D conversion circuit to acquire and convert in a two-way communication mode through an SPI protocol and controls the multichannel D/A conversion circuit to provide reference voltage. And the data of five channels processed by the multi-channel conversion circuit are combined into a low-power consumption data packet of 20 bytes, the low-power consumption data packet is transmitted to the mobile equipment by the Bluetooth antenna, and the low-power consumption data packet is displayed in the mobile equipment in real time in a scatter diagram mode. In order to improve the integration level of the circuit, the microcontroller circuit simplifies a Bluetooth program burning XDS100V3 interface into a simple 6-wire besides a Bluetooth chip module, integrates the simplified 6-wire interface and a serial port debugging interface on a 10-wire FPC connector and is connected with a program burning GPIO port of the Bluetooth chip, so that the integration level of the circuit is improved, and the volume of a circuit board is reduced.
In one embodiment, the bluetooth module further comprises a bluetooth antenna, and the bluetooth antenna transmits data to the terminal, and the data is displayed on a mobile phone screen in real time after a series of data receiving, data processing, data/scatter chart displaying and storing.
Preferably, referring to fig. 6 and 7, the power management circuit includes a lithium ion battery, an analog power supply LDO module, and a digital power supply LDO module, and the lithium ion battery is connected to the analog power supply LDO module and the digital power supply LDO module, respectively;
the analog power supply LDO module comprises an ADP1711AUJZ-3.3-R7 chip, a VCC power supply is provided through a No. 5 power supply output pin and is respectively connected with the front end analog circuit and the conversion circuit, the digital power supply LDO module comprises a TPS79933DDCT chip, a DVDD power supply is provided through a No. 5 power supply output pin and is connected with the microcontroller circuit, and a No. 24 pin of the Bluetooth chip and the analog power supply LDO module enable a No. 3 pin EN to be connected.
In this embodiment, the power management circuit is configured to provide a stable working power supply when each module of the detection circuit operates normally, and the required working power supply is provided by the power management circuit. The lithium battery is adopted for supplying power, the two low-power-consumption low-dropout linear voltage regulators are respectively connected with the output of the battery, wherein the analog power supply LDO supplies power to the front-end analog circuit, the multi-channel conversion circuit and the digital power supply LDO to the microcontroller circuit. The data acquisition and recording process can last for more than 15 hours when a 200mAh lithium battery is used, and the requirements of wearable sweat detection equipment for wearing experiments can be completely met.
The power consumption is reduced by turning off the acquisition part, i.e. the analog power supply part, with the microcontroller circuit when the acquisition is idle. For a battery-powered system, the design is carried out to improve the efficiency and stability of the system and reduce the self loss, so that the long-time wearable sweat substance collection test is realized.
Through the utility model provides a data acquisition circuit gathers and handles sweat multi-parameter material data in real time to carry out effectual conversion, merge and transmission to data and handle, not only guaranteed output signal's the degree of accuracy and stability, provide a new integrated circuit's thinking moreover, improve circuit's integrated level, consequently possess good application prospect.
The embodiment of the utility model provides a wearable sweat collection device of multi-parameter based on electrochemistry is still provided, it includes the aforesaid wearable sweat collection circuit based on multi-parameter electrochemistry.
The utility model provides a novel sweat multi-parameter substance acquisition circuit and a device, which realize wearable sweat multi-parameter real-time detection, and compared with the traditional sweat detection circuit, the device widens the range of substance concentration detection, and improves the sweat substance detection precision and stability; the circuit improves the detection flexibility, and the sensor with the front end integrated on the flexible printed circuit board (PET) material is replaced by other required sensors, so that the circuit can still be suitable; the modules of the circuit are tightly connected, and a low-power-consumption Bluetooth chip adopted in the circuit integrates the traditional MCU and the Bluetooth module together, so that the integration level of the circuit is greatly improved, and the cost is reduced; the components adopted by a plurality of modules of the circuit design enable the circuit to be stable and the overall power consumption of the device to be small; an analog power supply and digital power supply dual-power supply mode is adopted, and when the collection is idle, one power supply is selected to be turned off to reduce power consumption; adopt bluetooth chip module and cell-phone real-time transmission data's mode, not only solved the problem of real-time supervision sweat medium substance concentration change, moreover greatly reduced the cost of device and can dispose fast. The advantages of the above circuit are more suitable for wearable sweat detection, and the requirement of long-time real-time monitoring is met.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the teachings of this invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. An electrochemical-based multi-parameter wearable sweat collection circuit, comprising: the device comprises a front-end analog circuit, a conversion circuit, a microcontroller circuit and a power management circuit; the system comprises a front-end analog circuit, a conversion circuit, a microcontroller circuit and a power management circuit, wherein the front-end analog circuit, the conversion circuit, the microcontroller circuit and the power management circuit are sequentially connected;
the front-end analog circuit is used for collecting voltage signals and current signals in sweat and sending the collected voltage signals and current signals to the conversion circuit;
the conversion circuit is used for generating reference voltage required by electrochemical measurement, carrying out differential processing on the acquired voltage signal and current signal, and sending the data after the differential processing to the microcontroller circuit;
the microcontroller circuit is used for controlling the D/A conversion circuit to provide reference voltage for the front-end analog circuit and controlling the A/D conversion circuit to process and convert voltage signals and current signals acquired by the front-end analog circuit;
and the power management circuit is used for supplying power to the circuits.
2. The electrochemical-based multi-parameter wearable sweat collection circuit of claim 1, wherein the conversion circuit comprises an a/D conversion circuit and a D/a conversion circuit, the a/D conversion circuit comprising an AD7124-4 chip and the D/a conversion circuit comprising an AD5623 chip.
3. The electrochemical-based multi-parameter wearable sweat collection circuit of claim 2, wherein the front-end analog circuit includes an open circuit potential collection circuit and a potentiostat circuit,
the output end of the open circuit potential acquisition circuit is connected with pins No. 10, 11, 14 and 15 of the AD7124-4 chip; the output end of the potentiostat circuit is connected with No. 8 and No. 16 pins of the AD7124-4 chip;
the potential acquisition circuit acquires voltage signals and current signals in sweat by an open circuit potential-time curve method and sends the acquired data to the conversion circuit;
the potentiostat circuit collects voltage signals and current signals in sweat by adopting a time-current curve method, and sends the collected data to the conversion circuit.
4. The electrochemical-based multi-parameter wearable sweat collection circuit of claim 3 wherein the open circuit potential collection circuit includes a 1 st resistor, a 2 nd resistor, a 3 rd resistor, a4 th resistor, a 1 st op-amp, a 2 nd op-amp, a 3 rd op-amp, and a4 th op-amp;
the collection end SE1 is connected with the anode of the 1 st operational amplifier through the 1 st resistor, the cathode of the 1 st operational amplifier is connected with the output end of the 1 st operational amplifier, and the output end of the 1 st operational amplifier is connected with the No. 10 pin of the AD7124-4 chip; the collection end SE2 is connected with the anode of the 2 nd operational amplifier through the 2 nd resistor, the cathode of the 2 nd operational amplifier is connected with the output end of the 2 nd operational amplifier, and the output end of the 2 nd operational amplifier is connected with the No. 11 pin of the AD7124-4 chip; the acquisition end SE3 is connected with the anode of the No. 3 operational amplifier through the No. 3 resistor, the cathode of the No. 3 operational amplifier is connected with the output end of the No. 3 operational amplifier, and the output end of the No. 3 operational amplifier is connected with a No. 14 pin of the AD7124-4 chip; the 4 th resistor is connected with the anode of the 4 th operational amplifier, the cathode of the 4 th operational amplifier is connected with the output end of the 4 th operational amplifier, and the output end of the 4 th operational amplifier is connected with the constant potential rectifier circuit.
5. The electrochemical-based multi-parameter wearable sweat collection circuit of claim 3, wherein the potentiostat circuit comprises a 5 th, 6 th, 12 th, 13 th, 14 th, 15 th, 16 th, 17 th, 5 th, 6 th, 7 th, 8 th operational amplifier,
the 4 th operational amplifier output end is connected with the 5 th operational amplifier positive electrode through a 14 th resistor, RE1 is connected with the 5 th operational amplifier negative electrode through the 12 th resistor, and the RE1, the 5 th operational amplifier output end CE1 and the 6 th operational amplifier WE1 end form a 1 st group of third electrode system; the 6 th operational amplifier cathode is connected with the output end of the AD7124-4 chip through a 5 th resistor, the 6 th operational amplifier anode is connected with the No. 9 pin of the AD7124-4 chip through a 15 th resistor, and the 6 th operational amplifier output end is connected with the No. 8 pin of the AD7124-4 chip; the 4 th operational amplifier output end is connected with the 7 th operational amplifier positive electrode through a 16 th resistor, the RE2 is connected with the 6 th operational amplifier negative electrode through a 13 th resistor, and the RE2, the 7 th operational amplifier output end CE2 and the WE2 end of the 8 th operational amplifier form a 2 nd group of third electrode system; the 8 th operational amplifier negative electrode is connected with the output end of the AD7124-4 chip through a 6 th resistor, the 8 th operational amplifier positive electrode is connected with a No. 17 pin of the AD7124-4 chip through a 17 th resistor, and the 8 th operational amplifier output end is finally connected with a No. 16 pin of the AD7124-4 chip.
6. The electrochemical-based multi-parameter wearable sweat collection circuit of claim 2 wherein pins 2 and 1 of the AD7124-4 chip are connected to pins 7 and 8 of an AD5623 chip, respectively, and the pins 1, 2, 4, 24 of the AD7124-4 chip of the conversion circuit are connected to the microcontroller circuit.
7. The electrochemical-based multi-parameter wearable sweat collection circuit of claim 2 wherein the microcontroller circuit includes an MCU and a bluetooth module, wherein the MCU and the bluetooth module are connected;
the MCU is used for controlling the A/D conversion circuit and the D/A conversion circuit to process data acquired by the front end, controlling the analog power supply LDO module to supply power to the front end analog circuit, the A/D conversion circuit and the D/A conversion circuit, and running a protocol stack program required by Bluetooth communication;
the Bluetooth module is used for transmitting data.
8. The electrochemical-based multi-parameter wearable sweat collection circuit of claim 7 wherein the MCU includes a CC2640R2F chip, pins 1, 2, 36, 28, 29, 31, 33 of the CC2640R2F connected with pins 5, 4, 6 of AD5623 and pins 24, 4, 1, 2 of AD7124-4, respectively.
9. The electrochemical-based multi-parameter wearable sweat collection circuit of claim 1, wherein the power management circuit includes a lithium ion battery, an analog-powered LDO module, and a digital-powered LDO module, the lithium ion battery being connected with the analog-powered LDO module and the digital-powered LDO module, respectively;
the analog power supply LDO module comprises an ADP1711AUJZ-3.3-R7 chip, a VCC power supply is provided through a No. 5 power supply output pin and is respectively connected with the front end analog circuit and the conversion circuit, the digital power supply LDO module comprises a TPS79933DDCT chip, a DVDD power supply is provided through a No. 5 power supply output pin and is connected with the microcontroller circuit, and a No. 24 pin of the Bluetooth chip and the analog power supply LDO module enable a No. 3 pin EN to be connected.
10. An electrochemical-based multi-parameter wearable sweat collection device comprising the multi-parameter electrochemical-based wearable sweat collection circuit of any one of claims 1-9.
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| CN202221103396.9U CN218067741U (en) | 2022-05-10 | 2022-05-10 | Wearable sweat collection circuit and device based on multi-parameter electrochemistry |
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| CN202221103396.9U CN218067741U (en) | 2022-05-10 | 2022-05-10 | Wearable sweat collection circuit and device based on multi-parameter electrochemistry |
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