CN109374973A - 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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- CN109374973A CN109374973A CN201811328286.0A CN201811328286A CN109374973A CN 109374973 A CN109374973 A CN 109374973A CN 201811328286 A CN201811328286 A CN 201811328286A CN 109374973 A CN109374973 A CN 109374973A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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Abstract
The present invention discloses a kind of insulation resistance detection circuit, detection circuit and detection device, wherein, insulation resistance detection circuit includes test card connector, first switch switching circuit, second switch switching circuit, impedance detection circuit and control circuit, electrochemical sensor array test card is pluggable on test card connector, control circuit exports control signal control first switch switching circuit and the corresponding conducting of second switch switching circuit internal switch device respectively, and then realize that any two adjacent sensors of electrochemical sensor array test card form series circuit with first switch switching circuit and second switch switching circuit, impedance detection circuit is by output DC voltage into series circuit, and according to the insulation impedance between any two adjacent sensors of the current signal acquisition electrochemical sensor array test card on series circuit.Impedance detection circuit of the present invention can the insulation impedance to the interchannel of electrochemical sensor array test card detected respectively, and it is easy to maintain.
Description
Technical field
The present invention relates to POCT field of medical technology, in particular to a kind of insulation resistance detection circuit, detection circuit and inspection
Survey device.
Background technique
With the continuous development of on-site rapid inspection (POCT) field of medical technology, convenient and fast accurately medical real-time test
Technology is increasingly taken seriously, and POCT has easy to operate, and blood sampling equal samples amount is few, the characteristics of capable of quickly verifying result.
There are the various instant detector devices using disposable test card in the medical field POCT.
But the consistency of test card, which becomes, restricts one of the essential condition that POCT instrument precisely detects, wherein the biography of test card
The accuracy that technical requirements will affect testing result is not achieved in sensor interchannel insulation impedance.Many POCT instrument currently on the market
It is detected before the disposable test card test that device uses without insulation impedance between carrying out sensor passage, or the test card having is only
Be during fabrication or factory advance line sensor interchannel insulation impedance detection.Some companies use external emulator
(SIMULATOR) carry out the insulation performance of detecting instrument Measurement channel itself, but external emulator can not be logical to test card sensor
Road carries out insulating properties detection.And external emulator is due to its complex manufacturing technology, high production cost, and when user's use, operates
Points for attention are more, are easy the problems such as contaminated, can not meet the aspects such as the inexpensive, convenient and efficient of operator, maintenance difficulties are low
Demand.Influence testing result accurate performance in addition to instrument itself Measurement channel insulation performance, test card itself it is exhausted
One of the main reason for edge performance is also the accuracy of influence testing result.Due to test card and matched reagent be typically necessary it is low
Gentle storage and transport, surface is likely to package failure, condensation of moisture etc. and causes test card dirty in test card storage transportational process
Dye；The reasons such as clean, misoperation can Contamination measurement card yet for with gloves or gloves in use process.Test card after pollution
If generally requiring duplicate test without being identified before injecting sample.Duplicate test not only causes test card and matched reagent
Waste, more seriously cause the waste of patient's sample, more seriously waste the preciousness that medical staff gives emergency treatment to a patient
Time, in some instances it may even be possible to cause the erroneous judgement of testing result.
Summary of the invention
The main object of the present invention is to provide a kind of insulation resistance detection circuit, it is intended to realize to test card sensor passage
Carry out insulation impedance detection.
To achieve the above object, the present invention proposes a kind of insulation resistance detection circuit, for detecting electrochemical sensor battle array
The insulation impedance of column test card interchannel, the electrochemical sensor array test card include arranged side by side for acquiring blood
Parameter and the multiple electrochemical sensors for being converted to electric signal, the insulation resistance detection circuit include test card connector, the
One switch switching circuit, second switch switching circuit, impedance detection circuit and control circuit；
The first switch switching circuit and the second switch switching circuit are equipped with first end, controlled end and multiple
Multiple second ends at two ends, the first switch switching circuit pass through the test card connector and the electrochemical sensor battle array
Multiple sensors of column test card connect one to one, and multiple second ends of the second switch switching circuit pass through the test
Card connector and multiple sensors of the electrochemical sensor array test card connect one to one；
The controlled end of the first switch switching circuit and the second switch switching circuit respectively with the control circuit
Control terminal be correspondingly connected with, the signal input part of the first end of the first switch switching circuit and the impedance detection circuit connects
It connects, the first end ground connection of the second switch switching circuit；
The control circuit, for controlling the first switch switching circuit and the conducting of second switch switching circuit, with control
Make any two adjacent sensors and the first switch switching circuit and described the of the electrochemical sensor array test card
Two switch switching circuits form series circuit；
The impedance detection circuit for exporting DC voltage to the series circuit, and detects and flows through the series connection
The current signal of circuit, the insulation resistance between any two adjacent sensors to obtain the electrochemical sensor array test card
It is anti-.
Preferably, the impedance detection circuit includes power module, stream voltage conversion circuit and voltage collection circuit；
The power output end of the power module, the signal input part for flowing voltage conversion circuit and first switch switching electricity
The first end on road interconnects, and the signal output end of the stream voltage conversion circuit and the signal input part of the voltage collection circuit connect
It connects；
The power module, for exporting DC voltage to the series circuit；
The stream voltage conversion circuit, for the current signal for flowing through the series circuit to be converted to voltage signal and defeated
Out；
The voltage collection circuit, for acquiring the voltage signal of the stream voltage conversion circuit output.
Preferably, the first switch switching circuit and second switch switching circuit are respectively first switch chip and second
Switch chip, the first switch chip and the second switch chip include the first input/output terminal, universal signal end and
Multiple second input/output terminals；
Second input/output terminal of the first switch chip is the second end of the first switch switching circuit, described the
First input/output terminal of one switch chip is the first end of the first switch switching circuit, and the first switch chip leads to
It is the controlled end of the first switch switching circuit with signal end；
Second input/output terminal of the second switch chip is the second end of the second switch switching circuit, described the
First input/output terminal of two switch chips is the first end of the second switch switching circuit, and the second switch chip leads to
It is the controlled end of the first switch switching circuit with signal end.
Preferably, the power module includes DC power supply and voltage stabilizing chip；
The power output end of the DC power supply is connect with the power input of the voltage stabilizing chip, the voltage stabilizing chip
Power output end is the power output end of the power module；
The voltage stabilizing chip, the DC voltage for exporting the DC power supply carry out pressure stabilizing and export.
Preferably, the stream voltage conversion circuit includes the first operational amplifier, first resistor and first capacitor；
The non-inverting input terminal of first operational amplifier is connect with the power output end of the power module, and described first
The inverting input terminal of operational amplifier, the first end of the first resistor, the first end of the first capacitor are with described first
The first end of switch switching circuit connects, the second end, described of the output end of first operational amplifier, the first resistor
The second end of first capacitor is connect with the signal input part of the voltage collection circuit.
Preferably, the impedance detection circuit further includes signal amplification circuit, and the signal amplification circuit is serially connected in described
It flows between voltage conversion circuit and the voltage collection circuit；
The signal amplification circuit, for by it is described stream voltage conversion circuit output voltage signal amplify and export to
The voltage collection circuit.
Preferably, the impedance detection circuit further includes filter circuit, and the filter circuit is serially connected in the signal amplification
Between circuit and the stream voltage conversion circuit；
The filter circuit, for being filtered and being exported to described to the voltage signal of the stream voltage conversion circuit output
Signal amplification circuit.
The present invention also proposes a kind of detection circuit, which is characterized in that including test card detection circuit and exhausted as described above
Edge impedance detection circuit.
Preferably, the test card detection circuit includes multiple sensor passage input circuits, and each sensor is logical
Road input circuit is corresponded by the test card connector and multiple sensors of the electrochemical sensor test card to be connected
It connects；
The sensor passage input circuit, for acquiring the electrification in the electrochemical sensor array test card channel
It learns the electric signal of sensor output and exports to terminal device.
The present invention also proposes a kind of detection device, including detection circuit as described above.
Technical solution of the present invention by using test card connector, first switch switching circuit, second switch switching circuit,
Impedance detection circuit and control circuit constitute insulation resistance detection circuit, and when insulation resistance detection circuit works, electrochemistry is passed
Sensor array test card is plugged on test card connector, and control circuit exports control signal control first switch switching electricity respectively
Road and the corresponding conducting of second switch switching circuit internal switch device, and then realize any of electrochemical sensor array test card
Two adjacent sensors and first switch switching circuit and second switch switching circuit form series circuit, and impedance detection circuit passes through
DC voltage is exported into series circuit, and electrochemical sensor array test card is obtained according to the current signal on series circuit
Any two adjacent sensors between insulation impedance.
Impedance detection circuit of the present invention can divide the insulation impedance of the interchannel of electrochemical sensor array test card
It not detecting, test is accurate, without being manually operated, and it is easy to maintain.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the module diagram of one embodiment of insulation resistance detection circuit of the present invention；
Fig. 2 is the circuit diagram of one embodiment of insulation resistance detection circuit of the present invention；
Fig. 3 is the module diagram of one embodiment of detection circuit of the present invention；
Fig. 4 is the circuit diagram of one embodiment of impedance detection circuit of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot understand
For its relative importance of indication or suggestion or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In addition, the "and/or" occurred in full text contains
Justice are as follows: including three schemes arranged side by side, by taking " A/B " as an example, including the scheme that A scheme or B scheme or A and B meet simultaneously, separately
Outside, the technical solution between each embodiment can be combined with each other, can be real with those of ordinary skill in the art but must be
Based on existing, the combination of this technical solution will be understood that not when conflicting or cannot achieve when occurs in the combination of technical solution
In the presence of, also not the present invention claims protection scope within.
The present invention proposes a kind of insulation resistance detection circuit, it is intended to realize and carry out insulation performance to test card sensor passage
Detection.
As shown in FIG. 1, FIG. 1 is the module diagram of one embodiment of insulation resistance detection circuit of the present invention, the electrochemistry
Sensor array card 200 includes that the multiple electrochemistry for being used to acquire blood parameters and being converted to electric signal being arranged side by side pass
Sensor, such as T1~Tn, the insulation resistance detection circuit 100 includes test card connector 10, first switch switching circuit 20, the
Two switch switching circuits 30, impedance detection circuit 40 and control circuit 50；
The first switch switching circuit 20 and the second switch switching circuit 30 are equipped with first end, controlled end and more
Multiple second ends of a second end, the first switch switching circuit 20 pass through the test card connector 10 and the electrochemistry
Multiple sensors of Sensor array card 200 connect one to one, and multiple the second of the second switch switching circuit 30
End is corresponded by the test card connector 10 and multiple sensors of the electrochemical sensor array test card 200 to be connected
It connects；
The controlled end of the first switch switching circuit 20 and the second switch switching circuit 30 respectively with the control
The control terminal of circuit 50 is correspondingly connected with, the letter of the first end of the first switch switching circuit 20 and the impedance detection circuit 40
The connection of number input terminal, the first end ground connection of the second switch switching circuit 30；
The control circuit 50 is led for controlling the first switch switching circuit 20 and second switch switching circuit 30
It is logical, to control any two adjacent sensors and first switch switching electricity of the electrochemical sensor array test card 200
Road 20 and the second switch switching circuit 30 form series circuit；
The impedance detection circuit 40 for exporting DC voltage to the series circuit, and detects and flows through the string
The current signal for joining circuit, between any two adjacent sensors to obtain the electrochemical sensor array test card 200
Insulation impedance.
It include multiple parallel arrangement of electrochemical sensings inside electrochemical sensor array test card 200 in the present embodiment
Device, different electrochemical sensors is used to detect different parameters in blood, such as vim and vigour, blood glucose, electrolyte content, and turns
It is changed to corresponding electric signal, needs to be arranged the insulation impedance of certain resistance value between adjacent electrochemical sensor, to guarantee electrification
The insulation stability between sensor is learned, and then guarantees the test accuracy of test card.
When insulation resistance detection circuit 100 works, electrochemical sensor array test card 200 is plugged on test card connector
On 10, test card connector 10 include multiple parallel ports and with the electrification inside electrochemical sensor array test card 200
It learns sensor to be electrically connected one by one, multiple second ends of first switch switching circuit 20 and the other end of test card connector 10 connect
Connect, second switch switching circuit 30 it is in parallel with first switch switching circuit 20 equally with electrochemical sensor array test card 200
The other end connection, impedance detection circuit 40 is in instantaneous operating conditions, and exports DC voltage in first switch switching circuit
20 first end, it is assumed that the first electrochemical sensor T1 and electrochemistry second of detection electrochemical sensor array test card 200
Impedance between sensor T2, control circuit 50 output control signals to first switch switching circuit 20 and second switch switching electricity
Road 30, with the one of second end and first switch of the first electrochemical sensor T1 first switch switching circuit 20 connecting
The first end of switching circuit 20 is connected, with the second electrochemical sensor T2 second switch switching circuit 30 connecting one of them
Second end is connected and is grounded with the first end of second switch switching circuit 30, and the voltage that impedance detection circuit 40 exports is applied to the
Impedance, the first electrochemical sensor T1 and the second electrochemistry between one electrochemical sensor T1 and the second electrochemical sensor T2
On sensor T2, it can ignore since the impedance of electrochemical sensor itself is lower, impedance detection circuit 40 is according to flowing through
First electrochemical sensor T1 and electric current on the second electrochemical sensor T2 simultaneously can confirm the first electrification in conjunction with volt-ampere rule
Learn the impedance value between sensor T1 and the second electrochemical sensor T2, according to identical test mode, control circuit 50 according to
Certain sequential control first switch switching circuit 20 and the corresponding conducting of second switch switching circuit 30, and by corresponding adjacent electrification
Learn sensor access first switch switching circuit 20 and second switch switching circuit 30 simultaneously be formed into a loop, impedance detection circuit 40 from
And the impedance value between each adjacent electrochemical sensor is obtained, impedance circuit can be connect with terminal device (not shown go out), and
Each impedance detection value is exported to terminal device and shown.
First switch switching circuit 20 and second switch switching circuit 30 can be composed in parallel by multiple switch unit, switch
Unit is connect with control circuit 50 respectively, and the output control signal of control circuit 50 controls corresponding switching means conductive, and first opens
It closes switching circuit 20 and switch chip also can be used in second switch switching circuit 30, can specifically be configured according to the actual situation,
It is not particularly limited herein.
Resistor voltage divider circuit can be used in impedance detection circuit 40, such as by divider resistance, current collection circuit and direct current
Source composition, DC power supply export DC voltage, and current collection circuit acquires the electric current of divider resistance, and is determined according to volt-ampere rule
Impedance between electrochemical sensor, also can be used impedance detection chip and DC power supply directly acquires, specifically can be according to reality
It is configured, is not particularly limited herein.
Signal generator can be used in control circuit 50, and signal generator outputs control signals to first according to preset period of time and opens
Switching circuit 20 and second switch switching circuit 30 are closed, and controls first switch switching circuit 20 and second switch switching circuit 30
It is connected and corresponds to and connect with the sensor inside electrochemical sensor array test card 200, micro- place also can be used in control circuit 50
The processing units such as device, single-chip microcontroller are managed, are not particularly limited herein.
It should be noted that 200 internal sensor number of electrochemical sensor array test card is unlimited, insulation impedance detection
The sequence that 100 impedance detection circuit 40 of circuit obtains electrochemical sensor array adjacency channel can be from first Air conduct measurement to most
The latter channel can also be not particularly limited herein from the last one Air conduct measurement to first channel.
Technical solution of the present invention switches by using test card connector 10, first switch switching circuit 20, second switch
Circuit 30, impedance detection circuit 40 and control circuit 50 constitute insulation resistance detection circuit 100, insulation resistance detection circuit
When 100 work, electrochemical sensor array test card 200 is plugged on test card connector 10, and control circuit 50 exports respectively
Control signal control first switch switching circuit 20 and the corresponding conducting of 30 internal switch device of second switch switching circuit, Jin Ershi
Any two adjacent sensors of existing electrochemical sensor array test card 200 are cut with first switch switching circuit 20 and second switch
It changes circuit 30 and forms series circuit, impedance detection circuit 40 passes through output DC voltage into series circuit, and according to series electrical
The current signal of road obtains the insulation impedance between any two adjacent sensors of electrochemical sensor array test card 200.
Impedance detection circuit 40 of the present invention can insulation impedance to the interchannel of electrochemical sensor array test card 200 into
Row detects respectively, and test is accurate, without being manually operated, and it is easy to maintain.
As shown in Fig. 2, Fig. 2 is the circuit diagram of one embodiment of insulation resistance detection circuit of the present invention, in the present embodiment,
The impedance detection circuit 40 includes power module 41, stream voltage conversion circuit 42 and voltage collection circuit 43；
The power output end of the power module 41, the signal input part for flowing voltage conversion circuit 42 are cut with the first switch
Change the first end interconnection of circuit 20, the signal output end of the stream voltage conversion circuit 42 and the signal of the voltage collection circuit 43
Input terminal connection；
The power module 41, for exporting DC voltage to the series circuit；
The stream voltage conversion circuit 42, for the current signal for flowing through the series circuit to be converted to voltage signal and defeated
Out；
The voltage collection circuit 43, the voltage signal exported for acquiring the stream voltage conversion circuit 42.
In the present embodiment, power module 41 is exported on DC voltage to the first end of first switch switching circuit 20, and
First switch switching circuit 20 and second switch switching circuit 30 are applied to electrochemical sensor array test card 200 when being connected
On two adjacent electrochemical sensors, independent DC power supply is can be used in power module 41, and DC power supply and pressure stabilizing also can be used
Circuit cooperation is constituted, and is configured with specific reference to actual demand, is not particularly limited herein.
Stream voltage conversion circuit 42 is flowed through for acquiring in first switch switching circuit 20, second switch switching circuit 30 and electricity
Current signal in chemical sensor array test card 200, and voltage signal is converted to voltage collection circuit 43, stream pressure conversion
Operation amplifier circuit or power conversion chip etc. can be used in circuit 42, specifically can be according to being actually configured.
Voltage collection circuit 43 is used for the voltage signal that sample streams voltage conversion circuit 42 exports, and can be according to power module 41
The DC voltage value combination volt-ampere rule of output determines two adjacent electrochemicals sensing of electrochemical sensor array test card 200
Impedance between device, voltage collection circuit 43 can be used voltage dividing resistance circuit or voltage acquisition chip composition, do not do have herein
Body limitation.
The signal output end of voltage collection circuit 43 can be connect with control circuit 50, and control circuit 50 is according to the electricity received
The output voltage of pressure signal and power module 41 determines two adjacent electrochemicals sensing of electrochemical sensor array test card 200
Impedance between device, and can also directly connect with terminal device with terminal equipment in communication, the signal output end of voltage collection circuit 43
It connects, terminal device determines electrochemical sensor array test card according to the output voltage of the voltage signal and power module 41 that receive
Impedance between 200 two adjacent electrochemical sensors, specific connection type can flexible design, be not particularly limited herein.
In an alternative embodiment, the first switch switching circuit 20 and second switch switching circuit 30 are respectively first
Switch chip U1 and second switch chip U2, the first switch chip U1 and the second switch chip U2 include first defeated
Enter output end D, universal signal end A and multiple second input/output terminals, such as S1~Sn；
The second input/output terminal Sn of the first switch chip U1 is the second end of the first switch switching circuit 20,
The first input/output terminal D of the first switch chip U1 be the first switch switching circuit 20 first end, described first
The universal signal end A of switch chip U1 is the controlled end of the first switch switching circuit 20；
The second input/output terminal Sn of the second switch chip U2 is the second end of the second switch switching circuit 30,
The first input/output terminal D of the second switch chip U2 be the second switch switching circuit 30 first end, described second
The universal signal end A of switch chip U2 is the controlled end of the first switch switching circuit 20.
In the present embodiment, the switch of first switch switching circuit 20 and the identical model of the use of second switch switching circuit 30
Chip, and be respectively set to first switch chip U1 and second switch chip U2, the universal signal end A of first switch chip U1 and
The universal signal end A of second switch chip U2 is connect with control circuit 50, the universal signal end A of first switch chip U1 and
The quantity of the universal signal end A of two switch chip U2 does not limit, and a universal signal end A can be respectively set and control circuit 50 connects
It connects, multiple universal signal end A can also be respectively set and connect with control circuit 50, the first signal input of first switch chip U1 is defeated
Outlet D is connect with impedance detection circuit 40, the first signal input output end D ground connection of second switch chip U2, first switch core
Multiple second signal input/output terminal S1~Sn of piece U1 pass through test card connector 10 and electrochemical sensor array test card
200 multiple sensors are correspondingly connected with, and multiple second signal input/output terminal S1~Sn of second switch chip U2 pass through test
Card connector 10 and multiple sensors of electrochemical sensor array test card 200 are correspondingly connected with, first switch chip U1 according to
The control signal that universal signal end A is received connects the first signal input output end D and corresponding second signal input/output terminal
S, thus realize that the sensor of electrochemical sensor array test card 200 is connect with impedance detection circuit 40, second switch chip
U2 connects the first signal input output end D according to the control signal that universal signal end A is received and corresponding second signal inputs
Output end S, to control the adjacent sensors ground connection of electrochemical sensor array test card 200, so that series loop is formed, impedance
Detection circuit 40 starts impedance detection work.
In an alternative embodiment, the power module 41 includes DC power supply VCC and voltage stabilizing chip U3；
The power output end of the DC power supply VCC is connect with the power input of the voltage stabilizing chip U3, the pressure stabilizing
The power output end of chip U3 is the power output end of the power module 41；
The voltage stabilizing chip U3, the DC voltage for exporting the DC power supply VCC carry out pressure stabilizing and export.
In the present embodiment, the voltage that power module 41 exports is by DC power supply VCC output DC voltage and through voltage stabilizing chip
U3, which carries out pressure stabilizing or transformation, DC power supply VCC, to be converted to obtain by the rectified filter module of alternating current, and DC power supply also can be used
Module or mobile power source etc., are not particularly limited herein.
The power input IN and power output end OUT of voltage stabilizing chip U3 can also parallel-capacitor circuit be filtered place
Reason avoids generating harmonic wave interference testing result.
Further, the power output end of voltage stabilizing chip U3 can also series resistor, as second resistance R2 to stream pressure conversion electricity
On road 42, to guarantee that voltage stabilizing chip U3 output voltage in the operating voltage range of sensor, avoids voltage is excessive from causing electrification
Learn the sensor degradation in Sensor array card 200.
In an alternative embodiment, the stream voltage conversion circuit 42 include the first operational amplifier U4, first resistor R1 and
First capacitor C1；
The non-inverting input terminal of the first comparator U4 is connect with the power output end of the power module 41, and described first
The inverting input terminal of operational amplifier U4, the first end of the first resistor R1, the first end of the first capacitor C1 are and institute
State the first end connection of first switch switching circuit 20, output end, the first resistor R1 of the first operational amplifier U4
Second end, the second end of the first capacitor C1 connect with the signal input part of the voltage collection circuit 43.
In the present embodiment, according to the short and empty disconnected feature of void of amplifier, the normal phase input end of the first operational amplifier U4 and instead
Equal to input terminal voltage, i.e. the output voltage of hypothesis power supply is U, then the inverting input terminal voltage of the first operational amplifier U4
It also is U, that is, the voltage for being applied to 200 interchannel of electrochemical sensor array test card is also U, and it is logical which is applied to sensor
Between road, the electric current for flowing through the interchannel of test card electrochemical sensor array test card 2 is I, which also flows through resistance simultaneously
R1.The then output voltage of the first operational amplifier U4 are as follows:
U1=U-I*R1 (1)
Therefore, the electric current in series loop are as follows:
The then impedance R of the interchannel of electrochemical array sensing device test card 200:
U1 can be obtained by voltage collection circuit 43, and U is the output voltage of DC voltage chip, and R1 is known resistance,
So R can be found out by (4) formula.
Further, the impedance detection circuit 40 further includes signal amplification circuit 44, and the signal amplification circuit 44 is gone here and there
It connects between the stream voltage conversion circuit 42 and the voltage collection circuit 43；
The signal amplification circuit 44, for amplifying and defeated the voltage signal that exports of stream voltage conversion circuit 42
Out to the voltage collection circuit 43.
In order to which the voltage signal for guaranteeing that voltage collection circuit 43 acquires is more accurate, adopted in stream voltage conversion circuit 42 with voltage
Signal amplification circuit 44 is additionally provided between collector 43, signal amplification circuit 44 is used for the voltage that convection current voltage conversion circuit 42 exports
Signal carries out signal amplification, and programmable amplifier U5 can be used in signal amplification circuit 44, and programmable amplifier U5 can set amplification factor,
Programmable amplifier U5 can be corresponded to according to the acquisition range or precision of voltage collection circuit 43 and be set amplification factor, such as twice,
Four times etc..
Further, the impedance detection circuit 40 further includes filter circuit 45, and the filter circuit 45 is serially connected in described
Between signal amplification circuit 44 and the stream voltage conversion circuit 42；
The filter circuit 45, for it is described stream voltage conversion circuit 42 export voltage signal be filtered and export to
The signal amplification circuit 44.
In the present embodiment, in order to further increase 43 acquisition precision of voltage collection circuit, avoids receiving harmonic wave and cause to do
It disturbs, flows and be additionally provided with filter circuit 45 between 42 circuit of voltage conversion circuit and programmable amplifier U5, filter can be used in filter circuit 45
Wave capacitor parallel way is filtered, and the model of filter capacitor can be selected as the case may be.
As shown in figure 3, Fig. 3 is the module diagram of one embodiment of detection circuit of the present invention, the present invention also proposes a kind of inspection
Slowdown monitoring circuit, the detection circuit include test card detection circuit 300 and insulation resistance detection circuit 100, insulation impedance detection electricity
The specific structure on road 100 is referring to above-described embodiment, since this detection circuit uses whole technical sides of above-mentioned all embodiments
Case, therefore at least all beneficial effects brought by the technical solution with above-described embodiment, this is no longer going to repeat them.
In the present embodiment, detection circuit can realize the performance detection and insulation resistance of electrochemical sensor array test card 200
Anti- detection, test card detection circuit 300 receive the electric signal that electrochemical sensor array test card 200 exports and carry out classification and put
It is big to wait processing, to obtain the parameters of blood, and it can realize the neighboring sensor to electrochemical sensor array test card 200
The insulation impedance of device detects.
As shown in figure 4, the test card detection circuit 300 includes multiple sensor passage input circuits, such as first passes
Sensor channel input circuit 310, second sensor channel input circuit 320 etc., each sensor passage input circuit are logical
It crosses the test card connector 10 and multiple sensors of the electrochemical sensor array test card 200 connects one to one；
The sensor passage input circuit, for acquiring in 200 channel of electrochemical sensor array test card
The electric signal of electrochemical sensor output is simultaneously exported to terminal device.
In the present embodiment, test card detection circuit 300 includes multiple sensor passage input circuits, each sensor passage
Input circuit receives the electric signal of electrochemical sensor output and is sampled, and is converted into the finger of different blood testing projects
To terminal device, terminal device can be shown and be printed to different Blood Indexes for number output.
The present invention also proposes a kind of detection device, which includes detection circuit, the specific structure of the detection circuit
At least have referring to above-described embodiment since this detection device uses whole technical solutions of above-mentioned all embodiments
All beneficial effects brought by the technical solution of above-described embodiment, this is no longer going to repeat them.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. a kind of insulation resistance detection circuit, for detecting the insulation impedance of electrochemical sensor array test card interchannel, institute
Stating electrochemical sensor array test card includes multiple electricity for acquiring blood parameters and being converted to electric signal arranged side by side
Chemical sensor, which is characterized in that the insulation resistance detection circuit include test card connector, first switch switching circuit,
Second switch switching circuit, impedance detection circuit and control circuit；
The first switch switching circuit and the second switch switching circuit are equipped with first end, controlled end and multiple second
Multiple second ends at end, the first switch switching circuit pass through the test card connector and the electrochemical sensor array
Multiple sensors of test card connect one to one, and multiple second ends of the second switch switching circuit pass through the test card
Connector and multiple sensors of the electrochemical sensor array test card connect one to one；
The control with the control circuit respectively of the controlled end of the first switch switching circuit and the second switch switching circuit
End processed is correspondingly connected with, and the first end of the first switch switching circuit is connect with the signal input part of the impedance detection circuit,
The first end of the second switch switching circuit is grounded；
The control circuit, for controlling the first switch switching circuit and the conducting of second switch switching circuit, to control
Any two adjacent sensors and the first switch switching circuit and described second for stating electrochemical sensor array test card are opened
It closes switching circuit and forms series circuit；
The impedance detection circuit for exporting DC voltage to the series circuit, and detects and flows through the series circuit
Current signal, the insulation impedance between any two adjacent sensors to obtain the electrochemical sensor array test card.
2. insulation resistance detection circuit as described in claim 1, which is characterized in that the impedance detection circuit includes power supply mould
Block, stream voltage conversion circuit and voltage collection circuit；
The power output end of the power module, the signal input part for flowing voltage conversion circuit and the first switch switching circuit
The signal output end of first end interconnection, the stream voltage conversion circuit is connect with the signal input part of the voltage collection circuit；
The power module, for exporting DC voltage to the series circuit；
The stream voltage conversion circuit, for the current signal for flowing through the series circuit to be converted to voltage signal and is exported；
The voltage collection circuit, for acquiring the voltage signal of the stream voltage conversion circuit output.
3. insulation resistance detection circuit as claimed in claim 2, which is characterized in that the first switch switching circuit and second
Switch switching circuit is respectively first switch chip and second switch chip, the first switch chip and the second switch core
Piece includes the first input/output terminal, universal signal end and multiple second input/output terminals；
Second input/output terminal of the first switch chip is the second end of the first switch switching circuit, and described first opens
The first input/output terminal for closing chip is the first end of the first switch switching circuit, the general letter of the first switch chip
Number end be the first switch switching circuit controlled end；
Second input/output terminal of the second switch chip is the second end of the second switch switching circuit, and described second opens
The first input/output terminal for closing chip is the first end of the second switch switching circuit, the general letter of the second switch chip
Number end be the first switch switching circuit controlled end.
4. insulation resistance detection circuit as claimed in claim 3, which is characterized in that the power module include DC power supply and
Voltage stabilizing chip；
The power output end of the DC power supply is connect with the power input of the voltage stabilizing chip, the power supply of the voltage stabilizing chip
Output end is the power output end of the power module；
The voltage stabilizing chip, the DC voltage for exporting the DC power supply carry out pressure stabilizing and export.
5. insulation resistance detection circuit as claimed in claim 4, which is characterized in that the stream voltage conversion circuit includes the first fortune
Calculate amplifier, first resistor and first capacitor；
The non-inverting input terminal of first operational amplifier is connect with the power output end of the power module, first operation
The inverting input terminal of amplifier, the first end of the first resistor, the first end of the first capacitor with the first switch
The first end of switching circuit connects, the output end of first operational amplifier, the second end of the first resistor, described first
The second end of capacitor is connect with the signal input part of the voltage collection circuit.
6. insulation resistance detection circuit as claimed in claim 5, which is characterized in that the impedance detection circuit further includes signal
Amplifying circuit, the signal amplification circuit are serially connected between the stream voltage conversion circuit and the voltage collection circuit；
The signal amplification circuit, for amplifying and being exported to described by the voltage signal of the stream voltage conversion circuit output
Voltage collection circuit.
7. insulation resistance detection circuit as claimed in claim 6, which is characterized in that the impedance detection circuit further includes filtering
Circuit, the filter circuit are serially connected between the signal amplification circuit and the stream voltage conversion circuit；
The filter circuit, for being filtered and being exported to the signal to the voltage signal of the stream voltage conversion circuit output
Amplifying circuit.
8. a kind of detection circuit, which is characterized in that including test card detection circuit and as described in claim 1-7 any one
Insulation resistance detection circuit.
9. detection circuit as claimed in claim 8, which is characterized in that the test card detection circuit includes that multiple sensors are logical
Road input circuit, each sensor passage input circuit are surveyed by the test card connector and the electrochemical sensor
Multiple sensors of examination card connect one to one；
The sensor passage input circuit is passed for acquiring the electrochemistry in the electrochemical sensor array test card channel
The electric signal of sensor output is simultaneously exported to terminal device.
10. a kind of detection device, which is characterized in that including detection circuit as claimed in claim 9.
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| CN201811328286.0A CN109374973B (en) | 2018-11-08 | 2018-11-08 | Insulation resistance detection circuit, detection circuit and detection device |
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| CN201811328286.0A CN109374973B (en) | 2018-11-08 | 2018-11-08 | Insulation resistance detection circuit, detection circuit and detection device |
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