CN210894210U - Current detection device and blood glucose monitoring system - Google Patents
Current detection device and blood glucose monitoring system Download PDFInfo
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- CN210894210U CN210894210U CN201921915596.2U CN201921915596U CN210894210U CN 210894210 U CN210894210 U CN 210894210U CN 201921915596 U CN201921915596 U CN 201921915596U CN 210894210 U CN210894210 U CN 210894210U
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Abstract
The utility model relates to a current detection device and blood sugar monitoring system, the device electricity is connected in the sensor, the sensor includes reference electrode, working electrode and counter electrode, the device includes: the device comprises a reference voltage generation module, a voltage setting module, a detection module and a control module, wherein the control module is used for: controlling the voltage setting module to output a first voltage to the reference electrode during a first time period from start-up of the apparatus; after the first time period, controlling the voltage setting module to output a second voltage to the reference electrode, and obtaining a detection current according to the detection voltage and the reference voltage, wherein the first voltage is smaller than the second voltage. The utility model discloses can practice thrift the electric energy, increase the duration of a journey of device to improve user experience and practice thrift the cost.
Description
Technical Field
The utility model relates to an integrated circuit technical field especially relates to a current detection device and blood glucose monitoring system.
Background
The diabetic needs to monitor his/her blood sugar status at any time to guide medication and eating habits. The conventional blood pricking blood glucose tester has many disadvantages due to pain of patients and incapability of continuously monitoring blood glucose data. The dynamic blood glucose monitoring is to obtain the actual blood glucose concentration of a patient by continuously measuring the glucose concentration of interstitial fluid of the patient and adopting a proper algorithm, has the advantages of non-invasive and continuous monitoring, and has great application value.
However, when the blood glucose monitoring product in the related art is connected to the body of the user, the polarization time is long, the power consumption is large, the endurance time is shortened seriously, the experience brought to the user is poor, and the use cost is increased.
SUMMERY OF THE UTILITY MODEL
Technical problem
In view of this, the to-be-solved technical problem of the utility model is, how to reduce the polarization time, reduce power consumption, increase duration, improve user experience and practice thrift use cost.
Solution scheme
In order to solve the above technical problem, according to the utility model discloses an embodiment provides a current detection device, the device electricity is connected in the sensor, the sensor includes reference electrode, working electrode and counter electrode, the device includes:
the reference voltage generating module is used for generating reference voltage;
the voltage setting module is electrically connected with the reference voltage generating module, the reference electrode and the counter electrode and is used for setting the voltage of the reference electrode according to the reference voltage;
the detection module is electrically connected with the voltage setting module, the reference voltage generation module and the working electrode, and is used for setting the voltage of the working electrode by using the reference voltage, acquiring and converting the current flowing through the working electrode to obtain a detection voltage and outputting the detection voltage;
the control module is electrically connected to the detection module and the reference voltage generation module and is used for:
controlling the voltage setting module to output a first voltage to the reference electrode during a first time period from start-up of the apparatus;
after a first period of time, controlling the voltage setting module to output a second voltage to the reference electrode and obtain a detection current according to the detection voltage and the reference voltage,
wherein the first voltage is less than the second voltage.
For the current detection device, in a possible implementation manner, the voltage setting module includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a switch, a first capacitor, a second capacitor, a third capacitor, and a first operational amplifier, where:
the first end of the first resistor is electrically connected to the control module, the second end of the first resistor is electrically connected to the control end of the switch,
the first end of the switch is electrically connected to the first end of the second resistor, the second end of the switch is grounded,
the second end of the second resistor is electrically connected to the first end of the third resistor,
a second end of the third resistor is electrically connected to a first end of the fourth resistor, a first end of the fifth resistor, a first end of the first capacitor, and a positive input end of the first operational amplifier,
the second end of the fifth resistor is electrically connected to the first end of the sixth resistor, the second end of the sixth resistor is electrically connected to the reference voltage generating module, and is configured to receive the reference voltage,
a second terminal of the fourth resistor and a second terminal of the first capacitor are grounded,
the negative input end of the first operational amplifier is electrically connected to the first end of the second capacitor, the first end of the third capacitor and the first end of the seventh resistor, the output end of the first operational amplifier is electrically connected to the second end of the second capacitor and the counter electrode,
a second end of the seventh resistor and a second end of the third capacitor are electrically connected to the reference electrode.
For the current detection apparatus, in a possible implementation manner, the detection module includes an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor, a fifth capacitor, and a second operational amplifier, where:
the positive input end of the second operational amplifier is electrically connected to the first end of the eighth resistor, the second end of the eighth resistor is electrically connected to the reference voltage generating module, and is configured to receive the reference voltage,
the negative input end of the second operational amplifier is electrically connected to the first end of the ninth resistor, the first end of the tenth resistor and the first end of the fourth capacitor, the second end of the ninth resistor is electrically connected to the working electrode,
the output end of the second operational amplifier is electrically connected to the second end of the fourth capacitor, the second end of the tenth resistor and the first end of the eleventh resistor,
a second end of the eleventh resistor is electrically connected to the first end of the fifth capacitor for outputting the detection voltage,
and the second end of the fifth capacitor is grounded.
For the above current detection apparatus, in one possible implementation manner, the control module includes:
the first differential digital-to-analog conversion interface is used for receiving the detection voltage output by the detection module and the reference voltage during the first time period;
and the second differential digital-to-analog conversion interface is used for receiving the detection voltage output by the detection module after the first time period and the reference voltage.
For the current detection apparatus, in a possible implementation manner, the gain of the first differential digital-to-analog conversion interface is smaller than 1, and the gain of the second differential digital-to-analog conversion interface is larger than 3.
For the above current detection device, in one possible implementation manner, the switch includes a transistor and a triode.
For the current detection device, in a possible implementation manner, the control module is further configured to obtain concentration information of the detected object according to the detection current.
For the above current detection apparatus, in one possible implementation manner, the apparatus further includes:
and the transmission module is electrically connected with the control module and is used for transmitting the concentration information.
In order to solve the above technical problem, according to another embodiment of the present invention, there is provided a blood glucose monitoring system, including:
sensors based on three-electrode systems;
the current detection device;
and the display equipment is used for displaying the data output by the current detection device.
For the blood glucose monitoring system, in one possible implementation manner, the display device comprises a light emitting transistor and a light emitting diode.
Advantageous effects
Through above device, the embodiment of the utility model provides a can be according to the voltage difference between the working electrode of different time quantum control sensor and the reference electrode, unstable period during the first time quantum that the device started, output first voltage to reference electrode, after the first time quantum, device steady operation, output second voltage to reference electrode, through setting up different voltages to the reference electrode in the different stages of device work, can control the operating condition of device, thereby practice thrift the electric energy, increase the duration of device, in order to improve user experience and practice thrift the cost.
Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present invention and, together with the description, serve to explain the principles of the invention.
Fig. 1 shows a schematic diagram of a current detection device according to an embodiment of the present invention.
Fig. 2 shows a schematic diagram of a reference voltage generating module according to an embodiment of the present invention.
Fig. 3 shows a schematic diagram of a voltage setting module and a detection module according to an embodiment of the present invention.
Fig. 4 shows a schematic diagram of a control module according to an embodiment of the invention.
Detailed Description
Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present invention.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a current detection device according to an embodiment of the present invention.
The device may be used in a blood glucose sensing system, as shown in fig. 1, the device being electrically connected to a sensor, the sensor including a Reference Electrode (RE), a Working Electrode (WE), and a Counter Electrode (CE), the device comprising:
a reference voltage generating module 10 for generating a reference voltage;
a voltage setting module 20 electrically connected to the reference voltage generating module 10, the reference electrode RE and the counter electrode CE, for setting a voltage of the reference electrode RE according to the reference voltage;
the detection module 30 is electrically connected to the voltage setting module 20, the reference voltage generating module 10 and the working electrode WE, and is configured to set a voltage of the working electrode WE by using the reference voltage, collect and convert a current flowing through the working electrode WE to obtain a detection voltage, and output the detection voltage;
a control module 40 electrically connected to the detection module 30 and the reference voltage generation module 10, and configured to:
controlling the voltage setting module 20 to output a first voltage to the reference electrode RE during a first time period from start-up of the apparatus;
after the first period of time, controlling the voltage setting module 20 to output a second voltage to the reference electrode RE, and obtaining a detection current according to the detection voltage and the reference voltage,
wherein the first voltage is less than the second voltage.
Through above device, the embodiment of the utility model provides a can be according to the voltage difference between the working electrode of different time quantum control sensor and the reference electrode, unstable period during the first time quantum that the device started, output first voltage to reference electrode, after the first time quantum, device steady operation, output second voltage to reference electrode, through setting up different voltages to the reference electrode in the different stages of device work, can control the operating condition of device, thereby practice thrift the electric energy, increase the duration of device, in order to improve user experience and practice thrift the cost.
It should be noted that the sensor can be used for detecting information such as blood glucose concentration, and the sensor can be realized based on a three-electrode system, and the specific type and the realization mode of the sensor are not limited by the present invention, and those skilled in the art can select a suitable sensor as required.
In an example, the first time period that the device started can be for the sensor inserts the internal a period of time that begins work of user, and at first time period, the device is in polarization process, and this in-process device is in unstable state, can't be accurate, detect current signal steadily, therefore, the embodiment of the utility model provides a voltage that sets up the reference electrode in first time period is less than the second voltage in normal work, and under this condition, the voltage difference between working electrode and the reference electrode is greater than the voltage difference between working electrode and the reference electrode under the normal condition, like this, the utility model provides a polarization time can be reduced to the device that provides, reduces user's latency, improves user experience.
The utility model discloses do not restrict the specific length of time of first time quantum, technical personnel in the field can confirm according to the experience.
In one example, when the second voltage is input to the reference electrode, the voltage difference between the working electrode WE and the reference electrode RE may be 0.45V to 0.60V.
In one example, when the first voltage is input to the reference electrode RE, the voltage difference between the working electrode WE and the reference electrode RE may be 0.80V to 1.00V.
Of course, the above description of the voltage difference between the working electrode WE and the reference electrode RE in different states is exemplary, and in other embodiments, the voltage difference between the working electrode WE and the reference electrode RE may be other, as long as the voltage difference between the working electrode WE and the reference electrode RE is controlled to be higher in the polarization state than in the normal state.
The following describes exemplary modules of the current detection device according to an embodiment of the present invention.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a reference voltage generating module according to an embodiment of the present invention.
In one example, as shown in fig. 2, the reference voltage generated by the reference voltage generating module 10 may be 2.048V, and of course, the voltage value is an exemplary description and should not be considered as a limitation of the present invention, and in other embodiments, the reference voltage may be other.
In one example, as shown in fig. 2, the reference voltage generating module 10 may be implemented based on a chip with ultra-low power consumption, for example, an LT6656BCS6-2.048 chip with a supply current as low as 850nA, so that power consumption can be reduced, service life can be prolonged, and user experience can be improved.
In an example, the reference voltage generating module 10 may include a capacitor C18, a capacitor C17, a resistor R16, and the like, and the invention is not limited to the peripheral circuit configuration of the chip in the reference voltage module 10.
Of course, it should be understood that the above description of the reference voltage generating module 10 is exemplary and should not be considered as a limitation of the present invention, and those skilled in the art can select other chips to implement the reference voltage generating module 10 according to the needs and practical situations, and can generate reference voltages of other sizes.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating a voltage setting module and a detection module according to an embodiment of the present invention.
The voltage setting module 20 may include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a switch Q1, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a first operational amplifier a1, wherein:
a first end of the first resistor R1 is electrically connected to the control module 40, a second end of the first resistor R1 is electrically connected to a control end of the switch Q1,
a first end of the switch Q1 is electrically connected to a first end of the second resistor R2, a second end of the switch Q1 is grounded,
the second end of the second resistor R2 is electrically connected to the first end of the third resistor R3,
a second end of the third resistor R3 is electrically connected to a first end of the fourth resistor R4, a first end of the fifth resistor R5, a first end of the first capacitor C1, and a positive input INA + of the first operational amplifier A1,
a second end of the fifth resistor R5 is electrically connected to a first end of the sixth resistor R6, a second end of the sixth resistor R6 is electrically connected to the reference voltage generating module 10 for receiving the reference voltage,
a second terminal of the fourth resistor R4 and a second terminal of the first capacitor C1 are grounded,
a negative input terminal INA-of the first operational amplifier a1 is electrically connected to the first terminal of the second capacitor C2, the first terminal of the third capacitor C3, and the first terminal of the seventh resistor R7, an output terminal OUTA of the first operational amplifier a1 is electrically connected to the second terminal of the second capacitor C2 and the counter electrode CE,
a second terminal of the seventh resistor R7 and a second terminal of the third capacitor C3 are electrically connected to the reference electrode RE.
In the embodiment of the present invention, the first operational amplifier a1 is short, so the two input ends of the first operational amplifier a1 have the same point location (or are nearly the same), and therefore, the voltage of the reference electrode RE can be controlled by controlling the voltage of the positive input end INA +.
The embodiment of the utility model provides a through the on-state of control switch Q1, change the voltage size of first operational amplifier A1's positive input INA +, can conveniently control the voltage of reference voltage RE, simple structure easily realizes, and the cost is lower.
In an example, when the sensor is connected to the user, the sensor is in a polarization state (the related technology and experience can be referred to for judging the polarization state or the normal state, the utility model discloses do not limit to this), the control module can output control signal (0.9V ON) to switch Q1, in order to turn ON switch Q1, thereby reduce switch Q1, second resistance R2, third resistance R3, fourth resistance R4, fifth resistance R5, the resistance of the voltage divider circuit that sixth resistance R6 constitutes, thus, the voltage of the forward input end of first operational amplifier a1 reduces, correspondingly, the voltage reduction of reference voltage RE, the voltage difference between working electrode WE and reference electrode RE becomes big, can accelerate the polarization process, shorten the polarization time, reduce user waiting time, improve user experience.
It should be noted that the fifth resistor R5 and the sixth resistor R6 may be equivalent to a resistor, that is, in other embodiments, the fifth resistor R5 and the sixth resistor R6 may be implemented by a resistor, and the embodiment of the present invention may conveniently combine an ideal resistance value through two resistors. Similarly, the second resistor R2 and the third resistor R3 may be equivalent to one resistor.
In one example, when the sensor is polarized and in a steady state, the control module 40 may output a control signal (a signal smaller than 0.9V) to turn off the switch Q1, so as to increase the resistance of the voltage dividing circuit formed by the switch Q1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6, such that the voltage at the positive input end of the first operational amplifier a1 increases, and accordingly, the voltage of the reference voltage RE increases, and the voltage difference between the working electrode WE and the reference electrode RE becomes smaller, and reaches the voltage difference during normal operation, so that the detection can be performed smoothly.
Of course, the utility model discloses do not restrict the concrete resistance value of each resistance, as long as the size of each resistance value is selected to adaptability, according to above principle, can carry out reasonable setting to the voltage of reference electrode.
In one possible embodiment, the switch may include a transistor, or the like. The type of the switch is not limited, and those skilled in the art can select the switch as required.
In one possible implementation, as shown in fig. 3, the detection module 30 may include an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fourth capacitor C4, a fifth capacitor C5, and a second operational amplifier a2, wherein:
the positive input end INB + of the second operational amplifier a2 is electrically connected to the first end of the eighth resistor R8, the second end of the eighth resistor R8 is electrically connected to the reference voltage generating module 10 for receiving the reference voltage,
a negative input terminal INB "of the second operational amplifier a2 is electrically connected to a first terminal of the ninth resistor R9, a first terminal of a tenth resistor R10, and a first terminal of a fourth capacitor C4, a second terminal of the ninth resistor R9 is electrically connected to the working electrode WE,
the output terminal OUTB of the second operational amplifier A2 is electrically connected to the second terminal of the four capacitor C4, the second terminal of the tenth resistor R10 and the first terminal of the eleventh resistor R11,
a second end of the eleventh resistor R11 is electrically connected to the first end of the fifth capacitor C5 for outputting the detection voltage,
the second terminal of the fifth capacitor C5 is grounded.
The embodiment of the utility model provides a through being short with second operational amplifier A2 virtual, can be so that second operational amplifier A2's positive input INB + is the same with the voltage of negative direction input INB-, like this, the embodiment of the utility model provides a can set up the voltage of working electrode WE into reference voltage. For the high impedance characteristic of the operational amplifier a2, the voltage at the first end of the eighth resistor R8 may be regarded as being equal to the reference voltage, that is, the first end of the eighth resistor R8 may output the reference voltage.
According to the above principle, the voltage at the negative input end of the second operational amplifier a2 is the reference voltage, and according to the voltage collection principle of the sensor, the path of the current signal collected by the working electrode WE can be: the output end (OUTB) of the operational amplifier A2 passes through a tenth resistor R10 and a ninth resistor R9 and then flows to a target detection body (such as blood or other solution) through a WE electrode. The eleventh resistor R11 and the fifth capacitor C5 can be used as an RC filter circuit, and can filter the voltage signal at the output end of the second operational amplifier a2 and then output the voltage signal from the AD _ SENSE _ I end, so that the embodiment of the present invention can obtain the collected current signal by detecting the voltage signal of the AD _ SENSE _ I (i.e. the voltage signal at the first end of the eleventh resistor R11 and the first end of the fifth capacitor C5) and the voltage at the first end of the tenth resistor R10 (i.e. the reference voltage AD _ 2.048V).
In one possible implementation, as shown in fig. 3, the operational amplifier chip of the present invention may be a low power consumption and high precision dual operational amplifier, and in one example, the operational amplifier chip may be an LTC2064 IDD.
Of course, the utility model discloses model, the parameter of each period do not do the restriction in to the detection module, and the skilled person in the art can select as required.
The current detection device introduced above has the advantages of simple structure and low power consumption, can greatly reduce the use power consumption, prolongs the use time and increases the user experience.
In a possible embodiment, the control module 40 may be implemented by a dedicated hardware circuit, or may be implemented by general processing hardware (e.g., a CPU, a single-chip MCU, a field programmable logic device FPGA, etc.) in combination with executable logic instructions to execute the working process of the main control component, where the executable logic instructions may be implemented based on the prior art. The utility model discloses do not limit to the concrete implementation of master control subassembly.
Referring to fig. 4, fig. 4 is a schematic diagram of a control module according to an embodiment of the present invention.
In one example, the control module 40 may include a single chip microcomputer MCU, and the control module 40 may include:
a first differential digital-to-analog conversion interface (AD interface for short) for receiving the detection voltage and the reference voltage output by the detection module during the first period;
and the second differential digital-to-analog conversion interface is used for receiving the detection voltage output by the detection module after the first time period and the reference voltage.
In a possible implementation, the gain of the first differential digital-to-analog conversion interface is less than 1, and the gain of the second differential digital-to-analog conversion interface is greater than 3.
In one example, as shown in fig. 4, the first AD port may include AIN0(P0.02/AIN0) and AIN2(P0.04/AIN0) pins, which may be used to input an AD _ SENSE _ I signal and a reference voltage AD _2.048V in a polarization state, respectively.
In one example, as shown in fig. 4, the second AD port may include AIN1(P0.03/AIN1) and AIN3(P0.05/AIN3) pins, which may be used to input an AD _ SENSE _ I signal and a reference voltage AD _2.048V at the time of normal detection, respectively.
The embodiment of the utility model provides a through configuring two difference AD mouths, a polarization current value that is used for the sampling range scope to be big, a normal work current value that is used for the sampling range scope to be little can adapt to different circumstances. In order to gather the voltage when great polarization state, the utility model discloses the exemplary gain with first difference digital analog conversion interface sets up to 1/6, in order to improve the signal acquisition resolution ratio and the precision of normal during operation, the embodiment of the utility model provides an exemplary gain that will gather normal operating current's second difference digital analog conversion interface sets up to maximum 4. Therefore, the embodiment of the utility model provides a both can satisfy the heavy current when measuring polarization, can satisfy the demand of the measurement during operation electric current of high resolution high accuracy again.
In an example, after the control module 40 acquires the AD _ SENSE _ I signal and the reference voltage AD _2.048V, the voltage difference may be obtained according to the AD _ SENSE _ I signal and the reference voltage AD _2.048V, and the detection current may be calculated according to the voltage difference and the ninth resistor R9 and the tenth resistor R10 in the detection module, of course, the calculation mode may refer to ohm's law, and the related art may be referred to in the mode that the control module 40 implements the calculation, which is not limited in the present invention.
In one example, the control module 40 may output a control signal (0.9V ON) through the P0.07 pin to control the ON state of the switch Q1.
In a possible implementation manner, the control module is further configured to obtain concentration information of the detected object according to the detection current.
Of course, the embodiment of the present invention does not limit how to obtain the concentration information of the detected object by detecting the current, and those skilled in the art can refer to the related art to realize the method.
In a possible embodiment, the apparatus may further include:
and a transmission module (not shown) electrically connected to the control module for transmitting the concentration information.
In one example, the transmission module may be integrated in the control module 40, for example, the transmission module may be implemented by using a transmission component of a single-chip MCU, in addition to being separately configured.
In one possible implementation, the transmission module may include a bluetooth component, a WiFi component, and the like.
Of course, transmission module can be realized based on correlation technique, the utility model discloses do not restrict the mode of realizing transmission module.
Of course, the embodiment of the utility model provides a when realizing transmission module, in order to reduce the integrated circuit board size, can utilize ceramic antenna to realize external antenna. Impedance matching is performed outside the MCU, and good signal intensity can be achieved through appropriate impedance matching parameters.
The utility model discloses with current detection device and sensor separation, current detection device repeatedly usable. The wireless communication, light in weight, convenient to carry, the time of depolarization is short, and the low power consumption lasts for 90 days when considering small volume. The blood glucose state under the condition of daily life can be monitored and the data can be recorded.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An electrical current sensing device, wherein the device is electrically connected to a sensor, wherein the sensor comprises a reference electrode, a working electrode, and a counter electrode, the device comprising:
the reference voltage generating module is used for generating reference voltage;
the voltage setting module is electrically connected with the reference voltage generating module, the reference electrode and the counter electrode and is used for setting the voltage of the reference electrode according to the reference voltage;
the detection module is electrically connected with the voltage setting module, the reference voltage generation module and the working electrode, and is used for setting the voltage of the working electrode by using the reference voltage, acquiring and converting the current flowing through the working electrode to obtain a detection voltage and outputting the detection voltage;
the control module is electrically connected to the detection module and the reference voltage generation module and is used for:
controlling the voltage setting module to output a first voltage to the reference electrode during a first time period from start-up of the apparatus;
after a first period of time, controlling the voltage setting module to output a second voltage to the reference electrode and obtain a detection current according to the detection voltage and the reference voltage,
wherein the first voltage is less than the second voltage.
2. The apparatus of claim 1, wherein the voltage setting module comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, a switch, a first capacitor, a second capacitor, a third capacitor, and a first operational amplifier, wherein:
the first end of the first resistor is electrically connected to the control module, the second end of the first resistor is electrically connected to the control end of the switch,
the first end of the switch is electrically connected to the first end of the second resistor, the second end of the switch is grounded,
the second end of the second resistor is electrically connected to the first end of the third resistor,
a second end of the third resistor is electrically connected to a first end of the fourth resistor, a first end of the fifth resistor, a first end of the first capacitor, and a positive input end of the first operational amplifier,
the second end of the fifth resistor is electrically connected to the first end of the sixth resistor, the second end of the sixth resistor is electrically connected to the reference voltage generating module, and is configured to receive the reference voltage,
a second terminal of the fourth resistor and a second terminal of the first capacitor are grounded,
the negative input end of the first operational amplifier is electrically connected to the first end of the second capacitor, the first end of the third capacitor and the first end of the seventh resistor, the output end of the first operational amplifier is electrically connected to the second end of the second capacitor and the counter electrode,
a second end of the seventh resistor and a second end of the third capacitor are electrically connected to the reference electrode.
3. The apparatus of claim 2, wherein the detection module comprises an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fourth capacitor, a fifth capacitor, and a second operational amplifier, wherein:
the positive input end of the second operational amplifier is electrically connected to the first end of the eighth resistor, the second end of the eighth resistor is electrically connected to the reference voltage generating module, and is configured to receive the reference voltage,
the negative input end of the second operational amplifier is electrically connected to the first end of the ninth resistor, the first end of the tenth resistor and the first end of the fourth capacitor, the second end of the ninth resistor is electrically connected to the working electrode,
the output end of the second operational amplifier is electrically connected to the second end of the fourth capacitor, the second end of the tenth resistor and the first end of the eleventh resistor,
a second end of the eleventh resistor is electrically connected to the first end of the fifth capacitor for outputting the detection voltage,
and the second end of the fifth capacitor is grounded.
4. The apparatus of claim 1, wherein the control module comprises:
the first differential digital-to-analog conversion interface is used for receiving the detection voltage output by the detection module and the reference voltage during the first time period;
and the second differential digital-to-analog conversion interface is used for receiving the detection voltage output by the detection module after the first time period and the reference voltage.
5. The apparatus of claim 4, wherein the gain of the first differential digital-to-analog conversion interface is less than 1 and the gain of the second differential digital-to-analog conversion interface is greater than 3.
6. The apparatus of claim 2, wherein the switch comprises a transistor, a triode.
7. The device of claim 1, wherein the control module is further configured to obtain concentration information of the detected object according to the detection current.
8. The apparatus of claim 7, further comprising:
and the transmission module is electrically connected with the control module and is used for transmitting the concentration information.
9. A blood glucose monitoring system, the system comprising:
sensors based on three-electrode systems;
a current detection device according to any one of claims 1 to 8;
and the display equipment is used for displaying the data output by the current detection device.
10. The system of claim 9, wherein the display device comprises a light emitting transistor, a light emitting diode.
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| CN201921915596.2U CN210894210U (en) | 2019-11-07 | 2019-11-07 | Current detection device and blood glucose monitoring system |
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| CN201921915596.2U CN210894210U (en) | 2019-11-07 | 2019-11-07 | Current detection device and blood glucose monitoring system |
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2019
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Effective date of registration: 20220531 Address after: 334000 Room 102, No. 1, Xiangyang Avenue, Shaxi Park, Xinzhou Industrial Park, Xinzhou District, Shangrao City, Jiangxi Province Patentee after: Jiangxi sitomai Medical Technology Co.,Ltd. Address before: 334000 Building 1, Xinghe international, No.36, Guangxin Avenue, Xinzhou District, Shangrao City, Jiangxi Province Patentee before: East China Institute of Digital Medical Engineering |
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