CN109374973B - Insulation resistance detection circuit, detection circuit and detection device - Google Patents
Insulation resistance detection circuit, detection circuit and detection device Download PDFInfo
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- CN109374973B CN109374973B CN201811328286.0A CN201811328286A CN109374973B CN 109374973 B CN109374973 B CN 109374973B CN 201811328286 A CN201811328286 A CN 201811328286A CN 109374973 B CN109374973 B CN 109374973B
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
The invention discloses an insulation impedance detection circuit, a detection circuit and a detection device, wherein the insulation impedance detection circuit comprises a test card connector, a first switch switching circuit, a second switch switching circuit, an impedance detection circuit and a control circuit, an electrochemical sensor array test card can be plugged on the test card connector, the control circuit respectively outputs control signals to control the corresponding conduction of internal switch devices of the first switch switching circuit and the second switch switching circuit, further, the formation of a series circuit by any two adjacent sensors of the electrochemical sensor array test card, the first switch switching circuit and the second switch switching circuit is realized, the impedance detection circuit outputs direct current voltage to the series circuit, and the insulation impedance between any two adjacent sensors of the electrochemical sensor array test card is obtained according to current signals on the series circuit. The impedance detection circuit can respectively detect the insulation impedance between the channels of the electrochemical sensor array test card, and is convenient to maintain.
Description
Technical Field
The invention relates to the technical field of POCT medical treatment, in particular to an insulation impedance detection circuit, a detection circuit and a detection device.
Background
With the continuous development of the field rapid inspection (POCT) medical technology field, the convenient and accurate medical immediate inspection technology is more and more emphasized, and the POCT has the characteristics of simple and convenient operation, small sample amount such as blood collection and the like, and capability of rapidly inspecting the result. Various instant test instruments using disposable test cards are emerging in the medical POCT field.
However, the consistency of the test card becomes one of the main conditions for restricting the precise detection of the POCT instrument, wherein the accuracy of the detection result is affected when the insulation resistance between the sensor channels of the test card does not meet the technical requirements. At present, the insulation resistance detection among sensor channels is not carried out before the disposable test card used by many POCT instruments on the market is tested, or the insulation resistance detection among sensor channels is only carried out by some test cards during manufacturing or before leaving a factory. Some companies use an external SIMULATOR (SIMULATOR) to detect the insulation performance of the instrumented measurement channel itself, but the external SIMULATOR cannot detect the insulation performance of the test card sensor channel. And the external simulator has the problems of complex manufacturing process, high production cost, more operation cautions when a user uses the external simulator, easy pollution and the like, and can not meet the requirements of operators on low cost, convenience, rapidness, low maintenance difficulty and the like. Besides the insulation performance of the measurement channel of the instrument, the insulation performance of the test card is also one of the main reasons for influencing the accuracy of the detection result. Because the test card and the matched reagent generally need low-temperature storage and transportation, the surface of the test card is likely to be damaged by packaging, condensed by water vapor and the like in the storage and transportation process of the test card to cause the pollution of the test card; the test card can be polluted due to no need of gloves in the using process, unclean gloves, improper operation and the like. Contaminated test cards often require repeated testing if they are not identified prior to injection of the sample. Repeated testing not only causes waste of the test card and the matched reagent, but also causes waste of a patient sample, wastes precious time for medical staff to rescue the patient and even possibly causes misjudgment of a detection result.
Disclosure of Invention
The invention mainly aims to provide an insulation resistance detection circuit, aiming at realizing the insulation resistance detection of a sensor channel of a test card.
In order to achieve the above object, the present invention provides an insulation resistance detection circuit for detecting insulation resistance between channels of an electrochemical sensor array test card, wherein the electrochemical sensor array test card comprises a plurality of electrochemical sensors arranged side by side for collecting blood parameters and converting the blood parameters into electrical signals, and the insulation resistance detection circuit comprises a test card connector, a first switch switching circuit, a second switch switching circuit, a resistance detection circuit and a control circuit;
the first switch switching circuit and the second switch switching circuit are respectively provided with a first end, a controlled end and a plurality of second ends, the plurality of second ends of the first switch switching circuit are correspondingly connected with the plurality of sensors of the electrochemical sensor array test card one by one through the test card connector, and the plurality of second ends of the second switch switching circuit are correspondingly connected with the plurality of sensors of the electrochemical sensor array test card one by one through the test card connector;
the controlled ends of the first switch switching circuit and the second switch switching circuit are respectively and correspondingly connected with the control end of the control circuit, the first end of the first switch switching circuit is connected with the signal input end of the impedance detection circuit, and the first end of the second switch switching circuit is grounded;
the control circuit is used for controlling the first switch switching circuit and the second switch switching circuit to be conducted so as to control any two adjacent sensors of the electrochemical sensor array test card to form a series circuit with the first switch switching circuit and the second switch switching circuit;
the impedance detection circuit is used for outputting direct current voltage to the series circuit and detecting current signals flowing through the series circuit so as to obtain the insulation impedance between any two adjacent sensors of the electrochemical sensor array test card.
Preferably, the impedance detection circuit comprises a power module, a current-voltage conversion circuit and a voltage acquisition circuit;
the power supply output end of the power supply module and the signal input end of the current-voltage conversion circuit are interconnected with the first end of the first switch switching circuit, and the signal output end of the current-voltage conversion circuit is connected with the signal input end of the voltage acquisition circuit;
the power supply module is used for outputting direct-current voltage to the series circuit;
the current-voltage conversion circuit is used for converting the current signal flowing through the series circuit into a voltage signal and outputting the voltage signal;
and the voltage acquisition circuit is used for acquiring the voltage signal output by the current-voltage conversion circuit.
Preferably, the first switch switching circuit and the second switch switching circuit are a first switch chip and a second switch chip respectively, and the first switch chip and the second switch chip each include a first input/output end, a common signal end, and a plurality of second input/output ends;
the second input/output end of the first switch chip is the second end of the first switch switching circuit, the first input/output end of the first switch chip is the first end of the first switch switching circuit, and the general signal end of the first switch chip is the controlled end of the first switch switching circuit;
the second input/output end of the second switch chip is the second end of the second switch switching circuit, the first input/output end of the second switch chip is the first end of the second switch switching circuit, and the general signal end of the second switch chip is the controlled end of the first switch switching circuit.
Preferably, the power module comprises a direct current power supply and a voltage stabilizing chip;
the power supply output end of the direct-current power supply is connected with the power supply input end of the voltage stabilizing chip, and the power supply output end of the voltage stabilizing chip is the power supply output end of the power supply module;
and the voltage stabilizing chip is used for stabilizing and outputting the direct-current voltage output by the direct-current power supply.
Preferably, the current-voltage conversion circuit comprises a first operational amplifier, a first resistor and a first capacitor;
the non-inverting input end of the first operational amplifier is connected with the power output end of the power module, the inverting input end of the first operational amplifier, the first end of the first resistor and the first end of the first capacitor are connected with the first end of the first switch switching circuit, and the output end of the first operational amplifier, the second end of the first resistor and the second end of the first capacitor are connected with the signal input end of the voltage acquisition circuit.
Preferably, the impedance detection circuit further comprises a signal amplification circuit, and the signal amplification circuit is connected in series between the current-voltage conversion circuit and the voltage acquisition circuit;
the signal amplifying circuit is used for amplifying the voltage signal output by the current-voltage conversion circuit and outputting the voltage signal to the voltage acquisition circuit.
Preferably, the impedance detection circuit further comprises a filter circuit, and the filter circuit is connected in series between the signal amplification circuit and the current-voltage conversion circuit;
and the filter circuit is used for filtering the voltage signal output by the current-voltage conversion circuit and outputting the filtered voltage signal to the signal amplification circuit.
The invention also provides a detection circuit which is characterized by comprising a test card detection circuit and the insulation resistance detection circuit.
Preferably, the test card detection circuit comprises a plurality of sensor channel input circuits, each of which is connected with a plurality of sensors of the electrochemical sensor test card in a one-to-one correspondence manner through the test card connector;
and the sensor channel input circuit is used for acquiring the electric signals output by the electrochemical sensors in the electrochemical sensor array test card channel and outputting the electric signals to terminal equipment.
The invention also provides a detection device comprising the detection circuit.
According to the technical scheme, the test card connector, the first switch switching circuit, the second switch switching circuit, the impedance detection circuit and the control circuit are adopted to form the insulation impedance detection circuit, when the insulation impedance detection circuit works, the electrochemical sensor array test card is plugged on the test card connector, the control circuit respectively outputs control signals to control the corresponding conduction of the internal switch devices of the first switch switching circuit and the second switch switching circuit, further, the fact that any two adjacent sensors of the electrochemical sensor array test card form a series circuit with the first switch switching circuit and the second switch switching circuit is achieved, the impedance detection circuit outputs direct current voltage to the series circuit, and insulation impedance between any two adjacent sensors of the electrochemical sensor array test card is obtained according to current signals on the series circuit.
The impedance detection circuit can respectively detect the insulation impedance between the channels of the electrochemical sensor array test card, has accurate test, does not need manual operation, and is convenient to maintain.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a block diagram of an insulation resistance detection circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of an insulation resistance detection circuit according to an embodiment of the present invention;
FIG. 3 is a block diagram of a detection circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an impedance detection circuit according to an embodiment of the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the descriptions relating to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 meaning of "and/or" appearing throughout is: the method comprises three parallel schemes, wherein the scheme is taken as an A/B (A/B) as an example, the scheme comprises the scheme A, the scheme B or the scheme A and the scheme B simultaneously satisfy, in addition, the technical schemes between the various embodiments can be combined with each other, but the technical schemes must be based on the realization of the technical schemes by a person skilled in the art, and when the technical schemes are mutually contradictory or can not be realized, the combination of the technical schemes is not considered to exist, and the protection scope of the invention is not within the protection scope of the invention.
The invention provides an insulation resistance detection circuit, aiming at realizing the insulation performance detection of a sensor channel of a test card.
As shown in fig. 1, fig. 1 is a schematic block diagram of an embodiment of an insulation resistance detection circuit according to the present invention, the electrochemical sensor array test card 200 includes a plurality of electrochemical sensors, such as T1-Tn, arranged side by side for collecting blood parameters and converting the blood parameters into electrical signals, and the insulation resistance detection circuit 100 includes a test card connector 10, a first switch switching circuit 20, a second switch switching circuit 30, a resistance detection circuit 40, and a control circuit 50;
the first switch switching circuit 20 and the second switch switching circuit 30 are each provided with a first end, a controlled end and a plurality of second ends, the plurality of second ends of the first switch switching circuit 20 are connected with the plurality of sensors of the electrochemical sensor array test card 200 through the test card connector 10 in a one-to-one correspondence, and the plurality of second ends of the second switch switching circuit 30 are connected with the plurality of sensors of the electrochemical sensor array test card 200 through the test card connector 10 in a one-to-one correspondence;
controlled ends of the first switch switching circuit 20 and the second switch switching circuit 30 are respectively connected to a control end of the control circuit 50, a first end of the first switch switching circuit 20 is connected to a signal input end of the impedance detection circuit 40, and a first end of the second switch switching circuit 30 is grounded;
the control circuit 50 is configured to control the first switch switching circuit 20 and the second switch switching circuit 30 to be turned on, so as to control any two adjacent sensors of the electrochemical sensor array test card 200 to form a series circuit with the first switch switching circuit 20 and the second switch switching circuit 30;
the impedance detection circuit 40 is configured to output a dc voltage to the series circuit, and detect a current signal flowing through the series circuit, so as to obtain an insulation impedance between any two adjacent sensors of the electrochemical sensor array test card 200.
In this embodiment, the electrochemical sensor array test card 200 includes a plurality of electrochemical sensors arranged in parallel, different electrochemical sensors are used for detecting different parameters in blood, such as blood gas, blood sugar, electrolyte content, and the like, and convert into corresponding electrical signals, and an insulation resistance with a certain resistance value needs to be set between adjacent electrochemical sensors to ensure the insulation stability between the electrochemical sensors, thereby ensuring the test accuracy of the test card.
When the insulation resistance detection circuit 100 is in operation, the electrochemical sensor array test card 200 is plugged into the test card connector 10, the test card connector 10 includes a plurality of parallel ports and is electrically connected to the electrochemical sensors in the electrochemical sensor array test card 200, a plurality of second terminals of the first switch switching circuit 20 are connected to the other terminal of the test card connector 10, the second switch switching circuit 30 is connected to the first switch switching circuit 20 in parallel and is also connected to the other terminal of the electrochemical sensor array test card 200, the resistance detection circuit 40 is in a real-time operation state and outputs a dc voltage to the first terminal of the first switch switching circuit 20, and if the resistance between the first electrochemical sensor T1 and the electrochemical second sensor T2 of the electrochemical sensor array test card 200 is detected, the control circuit 50 outputs a control signal to the first switch switching circuit 20 and the second switch switching circuit 30, one of the second terminals of the first switch switching circuit 20 connected to the first electrochemical sensor T1 is electrically connected to the first terminal of the first switch switching circuit 20, one of the second terminals of the second switch switching circuit 30 connected to the second electrochemical sensor T2 is electrically connected to the first terminal of the second switch switching circuit 30 and grounded, the impedance between the first electrochemical sensor T1 and the second electrochemical sensor T2 and the impedance between the first electrochemical sensor T1 and the second electrochemical sensor T2 output by the impedance detection circuit 40 are negligible due to the low impedance of the electrochemical sensors themselves, so that the impedance detection circuit 40 can confirm the impedance value between the first electrochemical sensor T1 and the second electrochemical sensor T2 according to the current flowing through the first electrochemical sensor T1 and the second electrochemical sensor T2 in combination with the volt-ampere rule, and according to the same test method, the control circuit 50 controls the first switch switching circuit 20 and the second switch switching circuit 30 to be correspondingly conducted according to a certain sequence, corresponding adjacent electrochemical sensors are connected into the first switch switching circuit 20 and the second switch switching circuit 30 to form a loop, the impedance detection circuit 40 obtains impedance values between the adjacent electrochemical sensors, and the impedance circuits can be connected with terminal equipment (not shown) and output the impedance detection values to the terminal equipment for displaying.
The first switch switching circuit 20 and the second switch switching circuit 30 may be formed by connecting a plurality of switch units in parallel, the switch units are respectively connected with the control circuit 50, the control circuit 50 outputs a control signal to control the corresponding switch units to be turned on, the first switch switching circuit 20 and the second switch switching circuit 30 may further adopt switch chips, and the switch chips may be specifically set according to actual conditions, and no specific limitation is made herein.
The impedance detection circuit 40 may be a resistance voltage divider circuit, for example, composed of a voltage divider resistor, a current collection circuit, and a dc power supply, where the dc power supply outputs a dc voltage, the current collection circuit collects a current of the voltage divider resistor, and determines an impedance between the electrochemical sensors according to a volt-ampere rule, and may further be an impedance detection chip and a dc power supply to directly obtain the impedance, which may be specifically set according to the practice, and is not limited specifically here.
The control circuit 50 may adopt a signal generator, the signal generator outputs a control signal to the first switch switching circuit 20 and the second switch switching circuit 30 according to a preset time period, and controls the first switch switching circuit 20 and the second switch switching circuit 30 to be conducted and correspondingly connected with the sensors inside the electrochemical sensor array test card 200, and the control circuit 50 may also adopt a processing unit such as a microprocessor, a single chip microcomputer, and the like, which is not limited herein.
It should be noted that, the number of sensors in the electrochemical sensor array test card 200 is not limited, and the sequence of the insulation resistance detection circuit 100 and the resistance detection circuit 40 for acquiring adjacent channels of the electrochemical sensor array may be from the first channel to the last channel, or from the last channel to the first channel, which is not limited herein.
The technical scheme of the invention adopts the test card connector 10, the first switch switching circuit 20, the second switch switching circuit 30, the impedance detection circuit 40 and the control circuit 50 to form the insulation impedance detection circuit 100, when the insulation impedance detection circuit 100 works, the electrochemical sensor array test card 200 is inserted into the test card connector 10, the control circuit 50 outputs control signals to control the corresponding conduction of the internal switch devices of the first switch switching circuit 20 and the second switch switching circuit 30, thereby realizing that any two adjacent sensors of the electrochemical sensor array test card 200 form a series circuit with the first switch switching circuit 20 and the second switch switching circuit 30, the impedance detecting circuit 40 outputs a direct current voltage to the series circuit, and obtains the insulation resistance between any two adjacent sensors of the electrochemical sensor array test card 200 from the current signal on the series circuit.
The impedance detection circuit 40 of the present invention can detect the insulation impedances between the channels of the electrochemical sensor array test card 200, respectively, with accurate testing, no need of manual operation, and convenient maintenance.
As shown in fig. 2, fig. 2 is a schematic circuit diagram of an embodiment of an insulation resistance detection circuit of the present invention, in this embodiment, the resistance detection circuit 40 includes a power module 41, a current-voltage conversion circuit 42, and a voltage acquisition circuit 43;
a power output end of the power module 41 and a signal input end of the current-voltage conversion circuit 42 are interconnected with a first end of the first switch switching circuit 20, and a signal output end of the current-voltage conversion circuit 42 is connected with a signal input end of the voltage acquisition circuit 43;
the power module 41 is configured to output a dc voltage to the series circuit;
the current-voltage conversion circuit 42 is configured to convert a current signal flowing through the series circuit into a voltage signal and output the voltage signal;
the voltage collecting circuit 43 is configured to collect a voltage signal output by the current-voltage converting circuit 42.
In this embodiment, the power module 41 outputs a dc voltage to the first end of the first switch switching circuit 20, and is applied to two adjacent electrochemical sensors of the electrochemical sensor array test card 200 when the first switch switching circuit 20 and the second switch switching circuit 30 are turned on, and the power module 41 may adopt an independent dc power supply, and may also adopt a configuration in which a dc power supply is matched with a voltage stabilizing circuit, and is specifically configured according to actual requirements, and no specific limitation is imposed herein.
The current-voltage conversion circuit 42 is configured to collect current signals flowing through the first switch switching circuit 20, the second switch switching circuit 30, and the electrochemical sensor array test card 200, and convert the current signals into voltage signals to the voltage collection circuit 43, and the current-voltage conversion circuit 42 may be an operational amplifier circuit or a power conversion chip, and may be specifically configured according to the actual situation.
The voltage acquisition circuit 43 is configured to sample a voltage signal output by the current-voltage conversion circuit 42, and may determine impedance between two adjacent electrochemical sensors of the electrochemical sensor array test card 200 according to a dc voltage value output by the power module 41 and a volt-ampere rule, where the voltage acquisition circuit 43 may be formed by a voltage-dividing resistor circuit or a voltage acquisition chip, and is not limited herein.
The signal output end of the voltage acquisition circuit 43 may be connected to the control circuit 50, the control circuit 50 may determine the impedance between two adjacent electrochemical sensors of the electrochemical sensor array test card 200 according to the received voltage signal and the output voltage of the power module 41, and communicate with the terminal device, the signal output end of the voltage acquisition circuit 43 may also be directly connected to the terminal device, and the terminal device may determine the impedance between two adjacent electrochemical sensors of the electrochemical sensor array test card 200 according to the received voltage signal and the output voltage of the power module 41, and the specific connection mode may be flexibly designed, and is not limited herein.
In an alternative embodiment, the first switch switching circuit 20 and the second switch switching circuit 30 are a first switch chip U1 and a second switch chip U2, respectively, and each of the first switch chip U1 and the second switch chip U2 includes a first input/output end D, a common signal end a, and a plurality of second input/output ends, such as S1-Sn;
a second input/output terminal Sn of the first switch chip U1 is a second terminal of the first switch switching circuit 20, a first input/output terminal D of the first switch chip U1 is a first terminal of the first switch switching circuit 20, and a common signal terminal a of the first switch chip U1 is a controlled terminal of the first switch switching circuit 20;
the second input/output end Sn of the second switch chip U2 is the second end of the second switch switching circuit 30, the first input/output end D of the second switch chip U2 is the first end of the second switch switching circuit 30, and the common signal end a of the second switch chip U2 is the controlled end of the first switch switching circuit 20.
In this embodiment, the first switch switching circuit 20 and the second switch switching circuit 30 are made of the same type of switch chips and are respectively configured as a first switch chip U1 and a second switch chip U2, the common signal terminal a of the first switch chip U1 and the common signal terminal a of the second switch chip U2 are both connected to the control circuit 50, the number of the common signal terminals a of the first switch chip U1 and the number of the common signal terminals a of the second switch chip U2 are not limited, one common signal terminal a can be respectively configured to be connected to the control circuit 50, a plurality of common signal terminals a can be respectively configured to be connected to the control circuit 50, the first signal input/output terminal D of the first switch chip U1 is connected to the impedance detection circuit 40, the first signal input/output terminal D of the second switch chip U2 is grounded, the plurality of second signal input/output terminals S1 to Sn of the first switch chip U1 are correspondingly connected to the plurality of sensors of the electrochemical sensor array test card 200 through the test card connector 10, the second switch chip U2 has a plurality of second signal input/output terminals S1-Sn connected to the plurality of sensors of the electrochemical sensor array test card 200 through the test card connector 10, the first switch chip U1 connects the first signal input/output terminal D and the corresponding second signal input/output terminal S according to the control signal received by the common signal terminal a, thereby connecting the sensors of the electrochemical sensor array test card 200 to the impedance detection circuit 40, the second switch chip U2 connects the first signal input/output terminal D and the corresponding second signal input/output terminal S according to the control signal received by the common signal terminal a, so as to control the grounding of the adjacent sensors of the electrochemical sensor array test card 200, thereby forming a series circuit, and the impedance detection circuit 40 starts the impedance detection operation.
In an alternative embodiment, the power module 41 includes a dc power VCC and a voltage regulation chip U3;
a power supply output end of the direct-current power supply VCC is connected with a power supply input end of the voltage stabilizing chip U3, and a power supply output end of the voltage stabilizing chip U3 is a power supply output end of the power supply module 41;
and the voltage stabilizing chip U3 is used for stabilizing and outputting the direct-current voltage output by the direct-current power supply VCC.
In this embodiment, the voltage output by the power module 41 is obtained by outputting a dc voltage from a dc power VCC and performing voltage stabilization or voltage transformation through a voltage stabilization chip U3, and the dc power VCC may be obtained by converting commercial power through a rectification filter module, and may also be a dc power module or a mobile power supply, and the like, which is not limited herein.
The power input end IN and the power output end OUT of the voltage stabilizing chip U3 can be connected with a capacitor circuit IN parallel to perform filtering processing, so that harmonic interference detection results are avoided.
Further, the power output terminal of the regulator chip U3 may be further connected in series with a resistor, such as a second resistor R2, to the current-to-voltage conversion circuit 42, so as to ensure that the output voltage of the regulator chip U3 is within the working voltage range of the sensor, thereby preventing the sensor in the electrochemical sensor array test card 200 from being damaged due to an excessive voltage.
In an alternative embodiment, the current-to-voltage conversion circuit 42 includes a first operational amplifier U4, a first resistor R1, and a first capacitor C1;
the non-inverting input terminal of the first comparator U4 is connected to the power output terminal of the power module 41, the inverting input terminal of the first operational amplifier U4, the first terminal of the first resistor R1, and the first terminal of the first capacitor C1 are all connected to the first terminal of the first switch switching circuit 20, and the output terminal of the first operational amplifier U4, the second terminal of the first resistor R1, and the second terminal of the first capacitor C1 are all connected to the signal input terminal of the voltage acquisition circuit 43.
In this embodiment, according to the virtual short and virtual break characteristics of the operational amplifier, the voltages at the positive input terminal and the negative input terminal of the first operational amplifier U4 are equal, that is, assuming that the output voltage of the power supply is U, the voltage at the negative input terminal of the first operational amplifier U4 is also U, that is, the voltage applied between the channels of the electrochemical sensor array test card 200 is also U, the voltage applied between the sensor channels is I, the current flowing between the channels of the electrochemical sensor array test card 2 of the test card is also I, and the current also flows through the resistor R1. The output voltage of the first operational amplifier U4 is:
U1＝U-I*R1 (1)
thus, the current on the series loop is:
the inter-channel impedance R of the electrochemical array sensor test card 200:
since U1 can be obtained by the voltage acquisition circuit 43, U is the output voltage of the dc voltage chip and R1 is a known resistance, R can be obtained by the expression (4).
Further, the impedance detection circuit 40 further includes a signal amplification circuit 44, and the signal amplification circuit 44 is connected in series between the current-voltage conversion circuit 42 and the voltage acquisition circuit 43;
the signal amplifying circuit 44 is configured to amplify the voltage signal output by the current-voltage converting circuit 42 and output the amplified voltage signal to the voltage collecting circuit 43.
In order to ensure that the voltage signal acquired by the voltage acquisition circuit 43 is more accurate, a signal amplification circuit 44 is further arranged between the current-voltage conversion circuit 42 and the voltage acquisition circuit 43, the signal amplification circuit 44 is used for amplifying the voltage signal output by the current-voltage conversion circuit 42, the signal amplification circuit 44 can adopt a program control amplifier U5, the program control amplifier U5 can set an amplification factor, and the program control amplifier U5 can correspondingly set an amplification factor, such as two times, four times and the like, according to the acquisition range or accuracy of the voltage acquisition circuit 43.
Further, the impedance detection circuit 40 further includes a filter circuit 45, and the filter circuit 45 is connected in series between the signal amplification circuit 44 and the current-voltage conversion circuit 42;
the filter circuit 45 is configured to filter the voltage signal output by the current-voltage conversion circuit 42 and output the filtered voltage signal to the signal amplification circuit 44.
In this embodiment, in order to further improve the acquisition precision of the voltage acquisition circuit 43 and avoid interference caused by harmonic waves, a filter circuit 45 is further disposed between the current-voltage conversion circuit 42 and the program control amplifier U5, the filter circuit 45 may perform filtering in a parallel connection manner of filter capacitors, and the types of the filter capacitors may be selected according to specific situations.
As shown in fig. 3, fig. 3 is a schematic block diagram of an embodiment of the detection circuit of the present invention, and the present invention further provides a detection circuit, where the detection circuit includes a test card detection circuit 300 and an insulation resistance detection circuit 100, and a specific structure of the insulation resistance detection circuit 100 refers to the above embodiments, and since the detection circuit adopts all technical solutions of all the above embodiments, the detection circuit at least has all beneficial effects brought by the technical solutions of the above embodiments, and details thereof are not repeated here.
In this embodiment, the detection circuit may be configured to perform performance detection and insulation resistance detection of the electrochemical sensor array test card 200, and the test card detection circuit 300 may be configured to receive the electrical signal output by the electrochemical sensor array test card 200 and perform classification, amplification, and other processing, so as to obtain various parameters of blood, and may be configured to perform insulation resistance detection of adjacent sensors of the electrochemical sensor array test card 200.
As shown in fig. 4, the test card detection circuit 300 includes a plurality of sensor channel input circuits, such as a first sensor channel input circuit 310, a second sensor channel input circuit 320, etc., each of which is connected to a plurality of sensors of the electrochemical sensor array test card 200 through the test card connector 10 in a one-to-one correspondence;
the sensor channel input circuit is configured to collect electrical signals output by the electrochemical sensors in the channels of the electrochemical sensor array test card 200 and output the electrical signals to a terminal device.
In this embodiment, the test card detection circuit 300 includes a plurality of sensor channel input circuits, each of which receives and samples an electrical signal output by an electrochemical sensor, converts the electrical signal into an index of different blood detection items, and outputs the index to the terminal device, and the terminal device can display and print different blood indexes.
The present invention further provides a detection apparatus, which includes a detection circuit, and the specific structure of the detection circuit refers to the above embodiments, and since the detection apparatus employs all technical solutions of all the above embodiments, the detection apparatus at least has all beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An insulation resistance detection circuit is used for detecting insulation resistance among channels of an electrochemical sensor array test card, the electrochemical sensor array test card comprises a plurality of electrochemical sensors which are arranged side by side and used for collecting blood parameters and converting the blood parameters into electric signals, and the insulation resistance detection circuit is characterized by comprising a test card connector, a first switch switching circuit, a second switch switching circuit, a resistance detection circuit and a control circuit;
the first switch switching circuit and the second switch switching circuit are respectively provided with a first end, a controlled end and a plurality of second ends, the plurality of second ends of the first switch switching circuit are correspondingly connected with the plurality of sensors of the electrochemical sensor array test card one by one through the test card connector, and the plurality of second ends of the second switch switching circuit are correspondingly connected with the plurality of sensors of the electrochemical sensor array test card one by one through the test card connector;
the controlled ends of the first switch switching circuit and the second switch switching circuit are respectively and correspondingly connected with the control end of the control circuit, the first end of the first switch switching circuit is connected with the signal input end of the impedance detection circuit, and the first end of the second switch switching circuit is grounded;
the control circuit is used for controlling the first switch switching circuit and the second switch switching circuit to be conducted so as to control any two adjacent sensors of the electrochemical sensor array test card to form a series circuit with the first switch switching circuit and the second switch switching circuit;
the impedance detection circuit is used for outputting direct current voltage to the series circuit and detecting current signals flowing through the series circuit so as to obtain the insulation impedance between any two adjacent sensors of the electrochemical sensor array test card.
2. The insulation resistance detection circuit according to claim 1, wherein the resistance detection circuit comprises a power supply module, a current-to-voltage conversion circuit and a voltage acquisition circuit;
the power supply output end of the power supply module and the signal input end of the current-voltage conversion circuit are interconnected with the first end of the first switch switching circuit, and the signal output end of the current-voltage conversion circuit is connected with the signal input end of the voltage acquisition circuit;
the power supply module is used for outputting direct-current voltage to the series circuit;
the current-voltage conversion circuit is used for converting the current signal flowing through the series circuit into a voltage signal and outputting the voltage signal;
and the voltage acquisition circuit is used for acquiring the voltage signal output by the current-voltage conversion circuit.
3. The insulation resistance detection circuit according to claim 2, wherein the first switch switching circuit and the second switch switching circuit are a first switch chip and a second switch chip, respectively, each of the first switch chip and the second switch chip including a first input/output terminal, a common signal terminal, and a plurality of second input/output terminals;
the second input/output end of the first switch chip is the second end of the first switch switching circuit, the first input/output end of the first switch chip is the first end of the first switch switching circuit, and the general signal end of the first switch chip is the controlled end of the first switch switching circuit;
the second input/output end of the second switch chip is the second end of the second switch switching circuit, the first input/output end of the second switch chip is the first end of the second switch switching circuit, and the general signal end of the second switch chip is the controlled end of the first switch switching circuit.
4. The insulation resistance detection circuit according to claim 3, wherein the power supply module includes a direct current power supply and a voltage stabilization chip;
the power supply output end of the direct-current power supply is connected with the power supply input end of the voltage stabilizing chip, and the power supply output end of the voltage stabilizing chip is the power supply output end of the power supply module;
and the voltage stabilizing chip is used for stabilizing and outputting the direct-current voltage output by the direct-current power supply.
5. The insulation resistance detection circuit according to claim 4, wherein the current-voltage conversion circuit includes a first operational amplifier, a first resistor, and a first capacitor;
the non-inverting input end of the first operational amplifier is connected with the power output end of the power module, the inverting input end of the first operational amplifier, the first end of the first resistor and the first end of the first capacitor are connected with the first end of the first switch switching circuit, and the output end of the first operational amplifier, the second end of the first resistor and the second end of the first capacitor are connected with the signal input end of the voltage acquisition circuit.
6. The insulation resistance detection circuit according to claim 5, wherein the resistance detection circuit further comprises a signal amplification circuit connected in series between the current-to-voltage conversion circuit and the voltage acquisition circuit;
the signal amplifying circuit is used for amplifying the voltage signal output by the current-voltage conversion circuit and outputting the voltage signal to the voltage acquisition circuit.
7. The insulation resistance detection circuit according to claim 6, wherein the resistance detection circuit further comprises a filter circuit connected in series between the signal amplification circuit and the current-voltage conversion circuit;
and the filter circuit is used for filtering the voltage signal output by the current-voltage conversion circuit and outputting the filtered voltage signal to the signal amplification circuit.
8. A test circuit comprising a test card test circuit and an insulation resistance test circuit as claimed in any one of claims 1 to 7.
9. The test circuit of claim 8, wherein said test card detection circuit includes a plurality of sensor channel input circuits, each of said sensor channel input circuits being connected in a one-to-one correspondence with a plurality of sensors of said electrochemical sensor test card via said test card connector;
and the sensor channel input circuit is used for acquiring the electric signals output by the electrochemical sensors in the electrochemical sensor array test card channel and outputting the electric signals to terminal equipment.
10. A detection device comprising the detection circuit of claim 9.
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| CN112098480B (en) * | 2020-09-03 | 2022-08-09 | 河北地质大学 | Electrochemical sensor change-over switch with adjustable channel quantity |
| CN113868163B (en) * | 2021-09-07 | 2024-02-23 | 深圳市国赛生物技术有限公司 | Interface multiplexing device and control method of interface multiplexing device |
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