CN101732044B - Bridge-type pressure sensor detection circuit, detection method and monitor - Google Patents
Bridge-type pressure sensor detection circuit, detection method and monitor Download PDFInfo
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- CN101732044B CN101732044B CN200810217325XA CN200810217325A CN101732044B CN 101732044 B CN101732044 B CN 101732044B CN 200810217325X A CN200810217325X A CN 200810217325XA CN 200810217325 A CN200810217325 A CN 200810217325A CN 101732044 B CN101732044 B CN 101732044B
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Abstract
The invention discloses a bridge-type pressure sensor detection circuit, comprising a lead detection network, a voltage derived circuit and a judging unit, wherein at least one end of the lead detection network is connected with a potential point; the lead detection network is used for connecting with two output ends of the bridge-type pressure sensor; the input end of the voltage derived circuit is connected with the lead detection network; the output end of the voltage derived circuit is connected with the judging unit; the voltage derived circuit is used for transmitting the voltage or voltage correlation at two output ends of the bridge-type pressure sensor to the judging unit; the judging unit is used for comparing the voltage or voltage correlation quantity at two output points of the bridge-type pressure sensor with the setting conditions, thus judging the malfunction of the bridge-type pressure sensor. In the invention, the judgment on lead fall-off and other malfunctions such as open circuit and short circuit are realized by detecting the voltage at two output points of the circuit detection sensor, thus improving reliability of lead fall-off detection, increasing detection functions of sensor towards other malfunctions, and having simple circuit structure and low cost.
Description
[technical field]
The present invention relates to a kind of testing circuit, relate in particular to a kind of bridge-type pressure sensor detection circuit, detection method and monitor.
[background technology]
Usually, the human blood-pressure measurement is divided into two kinds of NIBP (non-invasive blood pressure, Noninvasive BloodPressure) and IBP (invasive blood pressure, Invasive Blood Pressure).The IBP measurement be widely used in operating room or ICU (intensive care unit) etc. need carry out in real time patient's blood pressure, continuously, the accurate occasion of monitoring.
When IBP measured, at first in the blood vessel with the tested position of puncture needle implant into body, the external port of puncture needle linked to each other with pressure transducer by conduit, is full of heparin saline in the conduit.Because the pressure transmission characteristic of liquid, endovascular pressure can accurately be delivered on the outside pressure transducer, thereby can obtain the real-time change of intravascular pressure.
When test, the come off accident of (being called leads comes off) of pressure transducer and peripheral circuit takes place sometimes, sometimes pressure transducer itself also can break down, fault such as short circuit or open circuit for example, need the state that testing circuit comes the monitoring pressure pick off, after avoiding pressure transducer to break down, cause test crash.
As shown in Figure 1, the lead testing circuit that comes off of IBP is the important component part of IBP measuring circuit.This circuit is made up of IBP pick off and the leading testing circuit two parts that come off.
The IBP pick off adopts classical resistance bridge structure usually, arm resistance R1=R2=R3, be generally 300 Ω～10K scope (arm resistance of different brands pick off is different), wherein variable resistance Rx is a varistor, its resistance can change along with the variation of external pressure, external pressure is big more, and the resistance of varistor is more little, and showing is exactly that the differential mode voltage of the IBP+ of electric bridge output and IBP-is big more.The precision of common pick off is 5uV/V/mmHg, and when 5V powered, the differential mode voltage of the corresponding electric bridge output of 1mmHg pressure was 5*5=25uV.
The testing circuit that comes off of leading is a simple electric resistance partial pressure structure, and R4 wherein, R5, R6 are much larger than the arm resistance of electric bridge.In this circuit, the IBP pressure measuring value all obtains by the instrument amplifier output voltage is carried out analyzing and processing with the testing result that comes off of leading.IBP leads and comes off and this two states of connection different range of corresponding instrument amplifier output voltage respectively of leading.
When IBP leads when coming off, the voltage that is input to instrument amplifier is exactly the dividing potential drop of 5 couples of VCC of resistance R among Fig. 1.This voltage is negative value, and it is saturated to amplify the back negative sense through instrument amplifier, and output voltage is the minima that the negative sense of instrument amplifier can be exported, usually less than 100mV.Therefore software can be provided with a threshold value a little more than 100mV, comes off when detecting to be judged to be to lead when voltage is lower than this threshold value.When IBP led normal the connection, in the specified pressure limit of specification, the output voltage of pick off all can be higher than this threshold value.The principle that this circuit realization that Here it is is led and come off and detect.
This method detects the potential risk that comes off of leading: when occurring a very big negative pressure in the liquid road of pick off, the output of instrument amplifier may be hanged down the minima that negative sense can export, and module can be judged it by accident and come off for leading at this moment.In clinical manipulation, syringe extracts liquid or other abnormal operations all may cause occurring in the liquid road very big negative pressure.Perhaps this negative pressure just continues the very short time, is unacceptable but it is judged to be that leading comes off.
In addition, the lead testing circuit that comes off of existing IBP only has single fault detection capability, and the measuring ability that comes off that promptly leads when other faults appear in the sensor internal circuit, for example opens circuit or during short circuit, lacks corresponding fault detect.
[summary of the invention]
The technical problem to be solved in the present invention is, a kind of bridge-type pressure sensor detection circuit is provided, and can detect the fault of bridge-type pressure sensor.
Another technical problem that the present invention will solve is, a kind of monitor is provided, and comprises the circuit of the fault that can detect bridge-type pressure sensor.
Another technical problem that the present invention will solve is, a kind of bridge-type pressure sensor detection method is provided, and can detect the fault of bridge-type pressure sensor.
For achieving the above object, the invention provides a kind of bridge-type pressure sensor detection circuit, described circuit comprises the detection network that leads, voltage derived circuit and judging unit, described leading detected at least one end connection of network potential point, the described detection network that leads is used for being connected with two outfans of bridge-type pressure sensor, the input of described voltage derived circuit links to each other with the detection network that leads, the outfan of described voltage derived circuit links to each other with judging unit, described voltage derived circuit is used for two output end voltages of described bridge-type pressure sensor or voltage correlative are transmitted to described judging unit, described judging unit compares the voltage of bridge-type pressure sensor two output points or voltage correlative with imposing a condition, and judges the fault of described bridge-type pressure sensor.
The present invention also provides a kind of monitor, described circuit comprises bridge-type pressure sensor, the detection network leads, voltage derived circuit and judging unit, described leading detected at least one end connection of network potential point, the described detection network that leads is used for being connected with two outfans of bridge-type pressure sensor, the input of described voltage derived circuit links to each other with the detection network that leads, the outfan of described voltage derived circuit links to each other with judging unit, described voltage derived circuit is used for two output end voltages of described bridge-type pressure sensor or voltage correlative are transmitted to described judging unit, described judging unit compares the voltage of bridge-type pressure sensor two output points or voltage correlative with imposing a condition, and judges the fault of bridge-type pressure sensor.
The present invention also provides a kind of electric bridge testing circuit, described circuit comprises the detection network that leads, voltage derived circuit and judging unit, described leading detected at least one end connection of network potential point, the described detection network that leads is used for being connected with two outfans of electric bridge, the input of described voltage derived circuit links to each other with the detection network that leads, the outfan of described voltage derived circuit links to each other with judging unit, described voltage derived circuit is used for two output end voltages of described electric bridge or voltage correlative are transmitted to described judging unit, described judging unit compares the voltage of electric bridge two output points or voltage correlative with imposing a condition, and judges the fault of described electric bridge.
The present invention also provides a kind of bridge-type pressure sensor detection method, may further comprise the steps: the voltage or the voltage correlative that detect bridge-type pressure sensor two outfans, testing circuit comprises the detection network that leads, and described leading detected network and make the input of testing circuit not unsettled after coming off leading; More described voltage or voltage correlative and pre-conditioned; Judge the fault of described bridge-type pressure sensor.
The present invention also provides a kind of electric bridge detection method, may further comprise the steps: detect the voltage or the voltage correlative of electric bridge two outfans, testing circuit comprises the detection network that leads, and described leading detected network and make the input of testing circuit not unsettled after coming off leading; More described voltage or voltage correlative and pre-conditioned; Judge the fault of described electric bridge.
[description of drawings]
Fig. 1 testing circuit schematic diagram that comes off for IBP leads;
Fig. 2 is the pressure transducer cut-away view;
Fig. 3 is the testing circuit sketch map of an embodiment of the present invention;
Fig. 4 is the equivalent schematic diagram of sensor excitation negative signal (GND) when opening circuit;
Fig. 5 is the circuit diagram of the another kind of embodiment of voltage derived circuit of the present invention.
[specific embodiment]
The application's feature and advantage will be elaborated in conjunction with the accompanying drawings by embodiment.
Pressure transducer inner employing bridge structure (for example resistance bridge structure), be called bridge-type pressure sensor, Figure 2 shows that the pressure transducer in the invasive blood pressure detection, be the IBP pick off, be example to the structure of pressure transducer with the IBP pick off below and lead come off, the detection of sensor internal fault describes.
The IBP pick off comprises four resistance that connect into bridge structure, node between first resistance R 1 and second resistance R 2 connects power supply VCC, node ground connection between the 3rd resistance R 3 and the varistor Rx, node between first resistance R 1 and the varistor Rx is first output point, and the node between second resistance R 2 and the 3rd resistance R 3 is second output point.Rx changes thereupon when external pressure changes, and causes two output point Voltage unbalances of electric bridge and produces differential mode voltage, and this differential mode voltage promptly is the pressure signal that we need gather amplification.Lead come off and various probe failure patterns under, two output points of pick off present different voltage.
Utilize the voltage of two output point IBP+ of peripheral circuit detected pressures pick off and IBP-, realizing leading comes off and the judgement of probe failure.Lead normal the connection, leading comes off and the voltage of two output points of other various fault mode lower pressure sensors has nothing in common with each other, and it is as follows with VCC to be that 5V is that example is made a concrete analysis of:
1. lead normal the connection
IBP+, IBP-are 2.5V
2. lead and come off
IBP+, IBP-are unsettled.(voltage depends on peripheral circuit)
3. encourage positive signal VCC to open circuit
IBP+, IBP-are 0V
4. encourage negative signal GND to open circuit
IBP+, IBP-are 5V
5. the IBP+ holding wire opens circuit
IBP+ is unsettled, and IBP-is 2.5V
6. the IBP-holding wire opens circuit
IBP-is unsettled, and IBP+ is 2.5V
7. encourage positive signal VCC and the short circuit of IBP+ holding wire
IBP+ is 5V, and IBP-is 2.5V
8. encourage positive signal VCC and the short circuit of IBP-holding wire
IBP+ is 2.5V, and IBP-is 5V
9. encourage negative signal GND and the short circuit of IBP+ holding wire
IBP+ is 0V, and IBP-is 2.5V
10. encourage negative signal GND and the short circuit of IBP-holding wire
IBP+ is 2.5V, and IBP-is 0V
No matter how many ambient pressures is, the differential mode voltage of pick off output is 0 all the time.This fault can't directly detect, but the school gain can report an error.
Be not simple probe failure, this fault can't directly detect, and need realize overcurrent protection by hardware circuit.
1.R1 open circuit: IBP+ is 2.5V, and IBP-is 0V, state together 10.
2.Rx open circuit: IBP+ is 2.5V, and IBP-is 5V, state together 8.
3.R2 open circuit: IBP+ is 0V, and IBP-is 2.5V, state together 9.
4.R3 open circuit: IBP+ is 5V, and IBP-is 2.5V, state together 7.
1.R1 short circuit: state together 8.
2.Rx short circuit: state together 10.
3.R2 short circuit: state together 7.
4.R3 short circuit: state together 9.
These characteristics according to pressure transducer, bridge-type pressure sensor detection circuit comprises lead detection network, voltage derived circuit and judging unit, two outfans of described bridge-type pressure sensor connect two nodes in the detection network that leads respectively, the input of described voltage derived circuit links to each other with the detection network that leads, and the outfan of described voltage derived circuit links to each other with judging unit.
Lead and detect network and be used for preventing that the input signal of testing circuit is unsettled after coming off leading.When pressure transducer comes off when coming off (promptly lead), for the input that prevents testing circuit unsettled, at least one end that detects network that will lead is connected to certain potential point, for example an end ground connection, two-terminal-grounding or an end ground connection, another termination power or certain electrical voltage point, or the two ends of detecting network of leading all receive the node with certain voltage, and when promptly coming off when leading, the input of testing circuit can be not unsettled, or pulled down to ground, or by on move certain voltage to.Detect network one end ground connection if lead, when coming off when leading, two outfans of bridge-type pressure sensor are isoelectric level with two nodes that the detection network that leads is connected.When detecting the network two-terminal-grounding when leading, come off voltage differences maximum with the front-end sampling point when being connected of leading that can make leads is respectively 0V and 2.5V, and the probability minimum of leading and coming off is judged in appearance by accident like this.Connect just often when leading, under the situation that pressure changes, the voltage of front-end sampling point can be in 2.5V ± Δ scope fluctuation, because 0V and 2.5V gap are enough big, can guarantee pressure when the fluctuation of enough big Δ scope, occuring simultaneously can not appear in these two voltages, erroneous judgement promptly can not occur and lead and come off.
Described voltage derived circuit is used for two output end voltages of described bridge-type pressure sensor or voltage correlative are transmitted to described judging unit, the voltage derived circuit plays the isolated effect of both sides circuit, usually adopt the device of high input impedance and low output impedance to realize, to eliminate the influence to sample amplitude when reproduced, what make that testing circuit collects is two output end voltages or the voltage correlative of real bridge-type pressure sensor.
Described judging unit receives the output of voltage derived circuit, the voltage of bridge-type pressure sensor two output points or voltage correlative are compared with imposing a condition, to judge whether bridge-type pressure sensor comes off (promptly lead and come off) and the partial fault at least of sensor internal.Different input quantities has different Rule of judgment.
Embodiment one:
As shown in Figure 3, bridge-type pressure sensor detection circuit comprises testing circuit, differential amplifier circuit and the judging unit of coming off that lead, and the testing circuit that comes off of leading comprises leading and detects network and voltage derived circuit.Two outfans of IBP pick off (being bridge-type pressure sensor) connect two node IBP+, IBP-in the detection network that leads respectively, the input of described voltage derived circuit links to each other with the detection network that leads, the outfan of described voltage derived circuit links to each other with judging unit, two inputs of differential wave amplifying circuit connect two outfans and described the leading of described bridge-type pressure sensor respectively and detect two connected node IBP+, IBP-of network, and the outfan of described differential amplifier circuit is coupled to described judging unit.
In the present embodiment, the described detection network that leads preferably adopts resistor network, comprise placed in-line the 4th resistance R 4 of order, the 5th resistance R 5, the 6th resistance R 6 and the 7th resistance R 7, the other end of the 4th resistance R 4 and the 7th resistance R 7 is ground connection respectively, first outfan of described bridge-type pressure sensor connects the connected node IBP+ of the 4th resistance R 4 and the 5th resistance R 5, and second outfan of described bridge-type pressure sensor connects the connected node IBP-of the 6th resistance R 6 and the 7th resistance R 7.
Described voltage derived circuit can be the circuit that comprises a buffer, and buffer can adopt the amplifier buffer to realize, as shown in Figure 3, the amplifier buffer connects into the form of voltage follower, and certainly, the amplifier buffer also can connect into other form.In the present embodiment, the input in the same way of described amplifier buffer connects the connected node of described the 5th resistance R 5 and the 6th resistance R 6, and the outfan of described amplifier buffer is coupled to judging unit.The voltage that the input in the same way of amplifier buffer is gathered is two output end voltage correlatives of bridge-type pressure sensor, what outfan was exported also is two output end voltage phase relation amounts of bridge-type pressure sensor, different according to the resistance of the 5th resistance R 5 and the 6th resistance R 6, the magnitude of voltage of being gathered is also different, the magnitude of voltage of gathering equals AX+BY, X wherein, Y represents the resistance of the 5th resistance R 5 and the 6th resistance R 6 respectively, A, B represents coefficient, coefficient magnitude is relevant with the ratio of the resistance of the 5th resistance R 5 and the 6th resistance R 6, calculate by dividing potential drop, when for example the resistance of the 5th resistance R 5 and the 6th resistance R 6 equates, coefficient A, B equals 1/2.
The differential wave amplifying circuit is used for two output end voltage signals of bridge-type pressure sensor are carried out the differential mode amplification, and outputs to described judging unit.Differential amplifier circuit preferably adopts instrument amplifier, and those skilled in the art also can adopt other differential amplifier according to practical situation or demand, for example three amplifier differential amplifier circuits.
Described judging unit receives the output of voltage derived circuit and differential amplifier circuit, the voltage correlative of bridge-type pressure sensor two output points is compared with imposing a condition, and simultaneously judge that in conjunction with the output state of differential amplifier circuit leading of bridge-type pressure sensor comes off and the sensor internal fault, faults such as open circuit or short circuit for example.Judging unit can adopt hardware to realize, also can adopt software to realize, also can adopt software and hardware combining to realize, for example, judging unit comprises A/D converter and CPU, and the outfan of voltage derived circuit is connected A/D converter respectively with the outfan of differential amplifier circuit, and A/D converter is to output to CPU behind the digital signal with analog signal conversion, the inner embedding of CPU has program, and program compares judgement with input value and Rule of judgment.
In embodiment as shown in Figure 3, the two output point IBP+ and the IBP-of pick off pull down to ground with resistance R4 and R7 respectively, to guarantee that pick off comes off or the signal of sensor line is a low level when unsettled.And IBP+ and IBP-two point voltages are tried to achieve the voltage correlative through algebraic operation by resistance R 5, R6, export by the amplifier buffer.
A kind of embodiment of resistor network is to adopt symmetrical network, and promptly the annexation of each components and parts in the network and parameter are centrosymmetry with respect to certain point.Adopt symmetrical network to make the impedance matching of circuit good, the common mode rejection ratio height.For guaranteeing circuit symmetry, R4=R7 in this circuit, R5=R6.When resistor network adopted symmetrical network, the buffered input of amplifier connected the intermediate node of resistor network.Certainly, resistor network also can adopt asymmetrical network, and at this moment, the buffered input of amplifier can connect certain node of resistor network, as long as gather two output end voltage correlatives of pressure transducer.
For reducing the error that testing circuit is introduced, reduce influence, R4, R5, R6 to pick off itself, R7 preferably makes R4 greater than the arm resistance of IBP pick off, R5, R6, R7 is much larger than the arm resistance of IBP pick off (R4 for example, R5, R6, R7 are at least greater than 1000 times of arm resistance resistance).
Below with driving voltage VCC=5V, R4=R7=10M, R5=R6=470K, it is 100 times of duties that specifically describe circuit under the various situations for example that differential amplifier circuit adopts instrument amplifier, amplification:
1) leads and come off
The level of node IBP+ and IBP-is dragged down among Fig. 3, and voltage is 0V, so the voltage IBP_OFF of amplifier buffer output is the minima that negative sense can be exported, common voltage IBP_OFF＜200mV.
2) lead normal the connection
The common-mode voltage of pick off output 2.5V because sensor accuracy is generally 5uV/V/mmHg, can be similar to and thinks when pick off connects among Fig. 3, and IBP+ and IBP-voltage are 2.5V always, i.e. the voltage IBP_OFF of amplifier buffer output is about 2
.5V。3) sensor excitation positive signal (VCC) opens circuit
The common-mode voltage of pick off output is 0 among Fig. 3, and the voltage of amplifier buffering back output is the minima that negative sense can be exported, usually voltage IBP_OFF＜200mV.
4) sensor excitation negative signal (GND) opens circuit
Circuit can equivalence be Fig. 4 among Fig. 3 at this moment.Because R1＜＜R7, R2＜＜R4, the dividing potential drop of R1 and R2 is very little among Fig. 4, can think that the voltage of IBP+ and IBP-is VCC, thus the maximum that the voltage IBP_OFF of amplifier buffer output can export near forward, voltage IBP_OFF usually〉4.7V.
5) the IBP+ holding wire opens circuit, and promptly first outfan of pick off opens circuit to the holding wire of node IBP+.
The 2.5V common-mode voltage that IBP-still exports for pick off among Fig. 3.But IBP+ voltage is exactly dividing potential drop---the 2.2852V of 2.5V to 940K and 10M resistance, differential mode voltage V
IBP+-V
IBP-=-214.8mV, through negative sense is saturated certainly after 100 times of amplifications of instrument amplifier, instrument amplifier is output as the minima that negative sense can be exported, and judging unit can warning " the super scope of negative sense " after sampling this result.In addition, because the dividing potential drop of 470K resistance is 2.5V*0.47/10.94=107mV, so judging unit falls at the voltage that amplifier buffer output IBP_OFF place can detect about 100mV simultaneously.
6) the IBP-holding wire opens circuit, and promptly second outfan of pick off opens circuit to the holding wire of node IBP-.
The 2.5V common-mode voltage that IBP+ still exports for pick off among Fig. 3.But IBP-voltage is exactly dividing potential drop---the 2.2852V of 2.5V to 940K and 10M resistance, differential mode voltage V
IBP+-V
IBP-=214.8mV, through forward is saturated certainly after 100 times of amplifications of instrument amplifier, instrument amplifier is output as the maximum that forward can be exported, and judging unit can warning " the super scope of forward " after sampling this result.Judging unit falls at the voltage that amplifier buffering output IBP_OFF place also can detect about 100mV simultaneously.
7) sensor excitation positive signal (VCC) and IBP lead signals line IBP+ short circuit
IBP+ voltage is 5V among Fig. 3, and IBP-voltage still is 2.5V.Differential mode voltage V
IBP+-V
IBP-=2.5V, through forward is saturated certainly after 100 times of amplifications of instrument amplifier, instrument amplifier is output as the maximum that forward can be exported, and judging unit can warning " the super scope of forward " after sampling this result.
The voltage of amplifier buffer output this moment
8) sensor excitation positive signal (VCC) and IBP lead signals line IBP-short circuit
IBP-voltage is 5V among Fig. 3, and IBP+ voltage still is 2.5V.Differential mode voltage V
IBP+-V
IBP-=-2.5V, through negative sense is saturated certainly after 100 times of amplifications of instrument amplifier, instrument amplifier is output as the minima that negative sense can be exported, and judging unit can warning " the super scope of negative sense " after sampling this result.
The voltage of amplifier buffer output this moment
9) sensor excitation negative signal (GND) and IBP lead signals line IBP+ short circuit
IBP+ voltage is 0V among Fig. 3, and IBP-voltage still is 2.5V.Differential mode voltage V
IBP+-V
IBP-=-2.5V, through negative sense is saturated certainly after 100 times of amplifications of instrument amplifier, instrument amplifier is output as the minima that negative sense can be exported, and judging unit can warning " the super scope of negative sense " after sampling this result.
The voltage of amplifier buffer output this moment
10) sensor excitation negative signal (GND) and IBP lead signals line IBP-short circuit
IBP-voltage is 0V among Fig. 3, and IBP+ voltage still is 2.5V.Differential mode voltage V
IBP+-V
IBP-=2.5V, through forward is saturated certainly after 100 times of amplifications of instrument amplifier, instrument amplifier is output as the maximum that forward can be exported, and judging unit can warning " the super scope of forward " after sampling this result.
The voltage of amplifier buffer output this moment
11) pick off brachium pontis resistive-open fault
1.R1 open circuit: pick off output is with 10)
2.Rx open circuit: pick off output is with 8)
3.R2 open circuit: pick off output is with 9)
4.R3 open circuit: pick off output is with 7)
12) pick off brachium pontis resistive short fault
1.R1 short circuit: pick off output is with 8)
2.Rx short circuit: pick off output is with 10)
3.R2 short circuit: pick off output is with 7)
4.R3 short circuit: pick off output is with 9)
Therefore, the judgment basis that comes off with the various fault condition detection of pick off that leads is summarized as follows:
1. lead normal the connection
The IBP_OFF voltage of amplifier buffer output is about 2.5V.Judging unit detects 2.5V ± 50mV and can think and lead normal the connection.
2. lead and come off or encourage positive signal (VCC) to open circuit
The IBP_OFF voltage of amplifier buffer output is lower than 250mV (minima that negative sense can be exported), and the judging unit detection threshold is made as 250mV can detect this fault.Leading comes off or encourages positive signal (VCC) when opening circuit, and unified the warning is " lead and come off ".
3. excitation negative signal (GND) opens circuit
The IBP_OFF voltage of amplifier buffer output is higher than 4.7V (maximum that forward can be exported), and the judging unit detection threshold is made as 4.7V can detect this fault.
4.IBP+ holding wire opens circuit
Instrument amplifier output is lower than 100mV (minima that negative sense can be exported), and judging unit triggers report to the police " the super scope of negative sense ".If detecting IBP_OFF voltage simultaneously drops into about 2.4V, judging unit can further be orientated " the IBP+ holding wire opens circuit " as with reporting to the police.
5.IBP-holding wire opens circuit
Instrument amplifier output is higher than 4.7V (maximum that forward can be exported), and judging unit triggers report to the police " the super scope of forward ".If detecting IBP_OFF voltage simultaneously drops into about 2.4V, judging unit can further be orientated " the IBP-holding wire opens circuit " as with reporting to the police.
6. excitation positive signal (VCC) and the short circuit of IBP+ holding wire
Instrument amplifier output is higher than 4.7V (maximum that forward can be exported), and judging unit can trigger warning " the super scope of forward ".If detecting IBP_OFF voltage simultaneously is about 3.75V, judging unit can further be orientated " excitation positive signal (VCC) and the short circuit of IBP+ holding wire " with reporting to the police as.
7. excitation positive signal (VCC) and the short circuit of IBP-holding wire
Instrument amplifier output is lower than 100mV (minima that negative sense can be exported), and judging unit can trigger warning " the super scope of negative sense ".If detecting IBP_OFF voltage simultaneously is about 3.75V, judging unit can further be orientated " excitation positive signal (VCC) and the short circuit of IBP-holding wire " with reporting to the police as.
8. excitation negative signal (GND) and the short circuit of IBP+ holding wire
Instrument amplifier output is lower than 100mV (minima that negative sense can be exported), and judging unit can trigger warning " the super scope of negative sense ".If detecting IBP_OFF voltage simultaneously is about 1.25V, judging unit can further be orientated " excitation negative signal (GND) and the short circuit of IBP+ holding wire " with reporting to the police as.
9. excitation negative signal (GND) and the short circuit of IBP-holding wire
Instrument amplifier output is higher than 4.7V (maximum that forward can be exported), and judging unit can trigger warning " the super scope of forward ".If detecting IBP_OFF voltage simultaneously is about 1.25V, judging unit can further be orientated " excitation negative signal (GND) and the short circuit of IBP-holding wire " with reporting to the police as.
10. pick off brachium pontis resistive-open fault
According to the analysis of front, the arm resistance of four diverse locations open circuit corresponds respectively to judgment basis 6～9.
11. pick off brachium pontis resistive short fault
According to the analysis of front, the arm resistance short circuit of four diverse locations corresponds respectively to judgment basis 6～9.
Present embodiment combines by the result with the result of amplifier buffer output and differential amplifier circuit output and has realized judging that IBP leads comes off and the various faults state of pick off, and when any pressure is imported, lead and connect and the voltage common factor not of corresponding amplifier buffering output of coming off that leads, therefore this programme can not judged by accident to lead and be come off the reliability height.
Design is led and is come off testing circuit in the signal front-end sampling, in the sampling of signal rear end, both combine realize detecting comprehensively, reliably coming off and malfunction that IBP leads under the prerequisites that does not increase extra signal connecting line after amplifying through instrument amplifier simultaneously.And the circuit of prior art has only a sampled point, i.e. the voltage of a sampling instrument amplifier output point, and erroneous judgement is led and is come off easily, and the testing circuit that comes off of leading can cause voltage to fall, and influences certainty of measurement.
Make full use of the bridge structure of pressure transducer, and the work characteristics of peripheral circuit such as operational amplifier, instrument amplifier, the leading of design come off simple with fault detection method and circuit structure, cost is low, reliability is high.
Leading in the present embodiment detected network and can also comprise the placed in-line resistance more than four of order.
Differential amplifier circuit in the present embodiment can also omit, when differential amplifying circuit omits, can detect that leading of bridge-type pressure sensor comes off and a small amount of fault of bridge-type pressure sensor, testing circuit comprises the detection network that leads of two-terminal-grounding, voltage derived circuit and judging unit, two outfans of described bridge-type pressure sensor connect two nodes in the detection network that leads respectively, the input of described voltage derived circuit links to each other with the detection network that leads, the outfan of described voltage derived circuit links to each other with judging unit, described voltage derived circuit is used for two output end voltage correlatives of described bridge-type pressure sensor are transmitted to described judging unit, described judging unit compares the voltage correlative of bridge-type pressure sensor two output points with imposing a condition, thereby judging to lead comes off and a small amount of fault of bridge-type pressure sensor.
According to the analysis of front, when differential amplifying circuit omitted, testing circuit can detect following project:
1. lead normal the connection
The IBP_OFF voltage of amplifier buffer output is about 2.5V.Judging unit detects 2.5V ± 50mV and can think and lead normal the connection.
2. lead and come off or encourage positive signal (VCC) to open circuit
The IBP_OFF voltage of amplifier buffer output is lower than 250mV (minima that negative sense can be exported), and the judging unit detection threshold is made as 250mV can detect this fault.Leading comes off or encourages positive signal (VCC) when opening circuit, and unified the warning is " lead and come off ".
3. excitation negative signal (GND) opens circuit
The IBP_OFF voltage of amplifier buffer output is higher than 4.7V (maximum that forward can be exported), and the judging unit detection threshold is made as 4.7V can detect this fault.
Embodiment two:
As shown in Figure 5, bridge-type pressure sensor detection circuit comprises lead detection network, voltage derived circuit and judging unit.Two outfans of IBP pick off (being pressure transducer) connect two node IBP+, IBP-in the detection network that leads respectively, described voltage derived circuit is used for two output end voltages of bridge-type pressure sensor are transmitted to described judging unit, judging unit compares the magnitude of voltage and the setting value of the output of voltage derived circuit, thereby judging to lead comes off and the pressure transducer internal fault.
Lead detect network and judging unit can adopt with embodiment one in same or analogous structure.
The voltage derived circuit comprises the circuit of two buffers, equally, also can adopt the amplifier buffer to be used as buffer in the present embodiment, as shown in Figure 5, two outfans that the input of two amplifier buffers connects described bridge-type pressure sensor respectively detect two node IBP+, the IBP-that network is connected with described leading, and promptly two amplifier buffers are derived the voltage of two output points of bridge-type pressure sensor respectively.The outfan of two amplifier buffers is coupled to judging unit, judging unit compares the voltage of bridge-type pressure sensor two output points with imposing a condition, thus other faults of judge whether bridge-type pressure sensor comes off (promptly lead and whether come off) and pressure transducer.
This scheme judge lead come off and the method for sensor fault more direct, the IBP+ that obtains according to sampling and corresponding one by one the getting final product of 14 kinds of states of voltage with the pick off of above analysis of IBP-, so present embodiment can detect to lead and come off and the following fault of pick off:
1. lead normal the connection
IBP+, IBP-are 2.5V
2. lead and come off
IBP+, IBP-are unsettled.(voltage depends on peripheral circuit)
3. encourage positive signal VCC to open circuit
IBP+, IBP-are 0V
4. encourage negative signal GND to open circuit
IBP+, IBP-are 5V
5. the IBP+ holding wire opens circuit
IBP+ is unsettled, and IBP-is 2.5V
6. the IBP-holding wire opens circuit
IBP-is unsettled, and IBP+ is 2.5V
7. encourage positive signal VCC and the short circuit of IBP+ holding wire
IBP+ is 5V, and IBP-is 2.5V
8. encourage positive signal VCC and the short circuit of IBP-holding wire
IBP+ is 2.5V, and IBP-is 5V
9. encourage negative signal GND and the short circuit of IBP+ holding wire
IBP+ is 0V, and IBP-is 2.5V
10. encourage negative signal GND and the short circuit of IBP-holding wire
IBP+ is 2.5V, and IBP-is 0V
Pick off brachium pontis resistive-open fault
1.R1 open circuit: IBP+ is 2.5V, and IBP-is 0V, state together 10.
2.Rx open circuit: IBP+ is 2.5V, and IBP-is 5V, state together 8.
3.R2 open circuit: IBP+ is 0V, and IBP-is 2.5V, state together 9.
4.R3 open circuit: IBP+ is 5V, and IBP-is 2.5V, state together 7.
1.R1 short circuit: state together 8.
2.Rx short circuit: state together 10.
3.R2 short circuit: state together 7.
4.R3 short circuit: state together 9.
In the present embodiment, two series resistance R5, R6 between two outfans of pressure transducer can also need not or merge into one, promptly lead to detect network and comprise by two independently resistance or three resistor networks that placed in-line resistance is formed.
Present embodiment can also comprise differential amplifier circuit, and two inputs of differential amplifier circuit connect two outfans and described two the connected node IBP+ and the IBP-that leads and detect network of bridge-type pressure sensor respectively, and outfan is coupled to described judging unit.Here differential amplifier circuit is used for the voltage signal of two outfans of bridge-type pressure sensor is carried out differential amplification, outputs to judging unit then and carries out date processing.
In the foregoing description, lead and detect the circuit that network can adopt a variety of modes to connect, it is used for providing the input signal with certain voltage for testing circuit when coming off leading, for example, can make testing circuit ground connection or be connected to certain voltage (for example power supply or other electrical voltage points) leading when coming off.The detection network that leads can be symmetric resistor network, also can be asymmetric resistor network.The detection network that leads can also be the circuit of resistance, electric capacity or other device series, parallel or series-parallel connection.Connect for different circuit, the voltage of various malfunction down-sampling points can be different, so Rule of judgment also will change thereupon.
In the foregoing description, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance can be made of an independent resistance in the detection network that leads, and also can be made of by series, parallel or series-parallel connection a plurality of resistance.
Usually, the resistance value that detects network of leading is greater than the resistance value of the brachium pontis of pressure transducer, in certain embodiments, the resistance value that detects network of leading is much larger than the resistance value of the brachium pontis of pressure transducer, thereby leading connection just often, testing circuit few electrical quantity that influences pressure transducer of trying one's best, the voltage of few two output points that influence pressure transducer of particularly trying one's best.
The voltage derived circuit plays the effect of an impedance conversion, requires the structure of a high input impedance low output impedance to get final product.The voltage derived circuit can also be realized except adopting the realization of amplifier buffering in the following ways:
1) adopt operational amplifier to realize single-ended amplification, amplification can or equal 1 greater than 1, less than 1, and the Rule of judgment of judging unit correspondence also and then changes corresponding multiple and gets final product.
2) adopt instrument amplifier to realize single-ended amplification, amplification can or equal 1 greater than 1, less than 1, and the Rule of judgment of judging unit correspondence also and then changes corresponding multiple and gets final product.
In addition, the use comparator circuit also can be realized leading coming off and detect and the sensor fault detection, because the threshold value that we have a plurality of voltages to judge, need connect a plurality of comparators simultaneously, each comparator is realized a threshold decision, export high or low level to judging unit, judging unit leads according to the judgement that imposes a condition and comes off and the sensor internal fault.
Testing circuit in the foregoing description can be applicable in the various equipment that need monitor bridge-type pressure sensor, for example monitor.
Based on the foregoing description, the invention allows for a kind of electric bridge testing circuit, described circuit comprises the detection network that leads, voltage derived circuit and judging unit, described leading detected at least one end connection of network potential point, the described detection network that leads is used for being connected with two outfans of electric bridge, the input of described voltage derived circuit links to each other with the detection network that leads, the outfan of described voltage derived circuit links to each other with judging unit, described voltage derived circuit is used for two output end voltages of described electric bridge or voltage correlative are transmitted to described judging unit, described judging unit compares the voltage of electric bridge two output points or voltage correlative with imposing a condition, and judges the fault of described electric bridge.
Based on the foregoing description, the invention allows for a kind of bridge-type pressure sensor detection method, comprising:
Detect the voltage or the voltage correlative of bridge-type pressure sensor two outfans, testing circuit comprises the detection network that leads, and described leading detected network and make the input of testing circuit not unsettled after coming off leading;
More described voltage or voltage correlative and pre-conditioned;
Judge the fault of described bridge-type pressure sensor.
Based on the foregoing description, the invention allows for a kind of electric bridge detection method, comprising:
Detect the voltage or the voltage correlative of electric bridge two outfans, testing circuit comprises the detection network that leads, and described leading detected network and make the input of testing circuit not unsettled after coming off leading;
More described voltage or voltage correlative and pre-conditioned;
Judge the fault of described electric bridge.
In sum, IBP pressure transducer inside is bridge structure, and under the different faults pattern, the voltage of two output points has nothing in common with each other.The present invention makes full use of the construction features of bridge-type pressure sensor, realizing leading by the voltage of two output points of testing circuit detecting sensor comes off and failure judgment, for example can judge the open fault of pick off each several part and the short trouble between two parts.Compared with prior art, the reliability that having improved leads comes off and detect, and increased other fault detection capabilities of pick off, circuit structure is simple, cost is low, reliability is high.
More than be that example is illustrated to detect the IBP pressure transducer, in fact, testing circuit of the present invention also can be applicable to the bridge-type pressure sensor under the various situations.Further, the present invention can also use in the electric circuit inspection of using the resistance bridge structure in all cases.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (18)
1. bridge-type pressure sensor detection circuit, it is characterized in that: described circuit comprises the detection network that leads, voltage derived circuit and judging unit, described leading detected at least one end connection of network potential point, the described detection network that leads is used for being connected with two outfans of bridge-type pressure sensor, the input of described voltage derived circuit links to each other with the detection network that leads, the outfan of described voltage derived circuit links to each other with judging unit, described voltage derived circuit is used for two output end voltages of described bridge-type pressure sensor or voltage correlative are transmitted to described judging unit, described judging unit compares the voltage of bridge-type pressure sensor two outfans or voltage correlative with imposing a condition, and judges the fault of described bridge-type pressure sensor.
2. bridge-type pressure sensor detection circuit as claimed in claim 1 is characterized in that: described leading detected the ports that network comprises two connection potential point, is respectively first port and second port, the described first port ground connection, the described second port ground connection.
3. bridge-type pressure sensor detection circuit as claimed in claim 1 is characterized in that: the described detection network that leads is the resistor network that comprises at least two resistance, and the resistance of the resistance of described resistor network is much larger than the arm resistance of described bridge-type pressure sensor.
4. bridge-type pressure sensor detection circuit as claimed in claim 3 is characterized in that: described resistor network is a symmetrical network.
5. bridge-type pressure sensor detection circuit as claimed in claim 4, it is characterized in that: described resistor network comprises placed in-line the 4th resistance of order, the 5th resistance, the 6th resistance and the 7th resistance, the connected node of described the 4th resistance and the 5th resistance is used to be connected first outfan of described bridge-type pressure sensor, and the connected node of described the 6th resistance and the 7th resistance is used to be connected second outfan of described bridge-type pressure sensor.
6. as each described bridge-type pressure sensor detection circuit in the claim 1 to 5, it is characterized in that: described voltage derived circuit comprises two amplifier buffers, the input of described two amplifier buffers connects described leading respectively and detects network and be used for two nodes being connected with two outfans of bridge-type pressure sensor, and the outfan of described two amplifier buffers is coupled to judging unit.
7. as each described bridge-type pressure sensor detection circuit in the claim 1 to 4, it is characterized in that: described voltage derived circuit comprises an amplifier buffer, the input of described amplifier buffer connects the described detection network that leads, the outfan of described amplifier buffer is coupled to judging unit, and described amplifier buffer is used for the correlative of two output end voltages of described bridge-type pressure sensor is transmitted to judging unit.
8. bridge-type pressure sensor detection circuit as claimed in claim 5, it is characterized in that: described voltage derived circuit comprises an amplifier buffer, the input of described amplifier buffer connects the connected node of the 5th resistance and the 6th resistance, and the outfan of described amplifier buffer is coupled to judging unit.
9. bridge-type pressure sensor detection circuit as claimed in claim 7, it is characterized in that: also comprise differential amplifier circuit, two inputs of described differential amplifier circuit connect described leading respectively and detect network and be used for two nodes being connected with two outfans of bridge-type pressure sensor, the outfan of described differential amplifier circuit is coupled to described judging unit, described judging unit is used for the output of described voltage derived circuit and described differential amplifier circuit and imposes a condition comparing, and judges the fault of described bridge-type pressure sensor.
10. monitor, comprise bridge-type pressure sensor, it is characterized in that: also comprise the detection network that leads, voltage derived circuit and judging unit, described leading detected at least one end connection of network potential point, the described detection network that leads is used for being connected with two outfans of bridge-type pressure sensor, the input of described voltage derived circuit links to each other with the detection network that leads, the outfan of described voltage derived circuit links to each other with judging unit, described voltage derived circuit is used for two output end voltages of described bridge-type pressure sensor or voltage correlative are transmitted to described judging unit, described judging unit compares the voltage of bridge-type pressure sensor two outfans or voltage correlative with imposing a condition, and judges the fault of bridge-type pressure sensor.
11. monitor as claimed in claim 10 is characterized in that: described leading detected the ports that network comprises two connection potential point, is respectively first port and second port, the described first port ground connection, the described second port ground connection.
12. monitor as claimed in claim 11, it is characterized in that: the described detection network that leads comprises placed in-line the 4th resistance of order, the 5th resistance, the 6th resistance and the 7th resistance, first outfan of described bridge-type pressure sensor connects the connected node of the 4th resistance and the 5th resistance, and second outfan of described bridge-type pressure sensor connects the connected node of the 6th resistance and the 7th resistance.
13. monitor as claimed in claim 12, it is characterized in that: described voltage derived circuit comprises an amplifier buffer, the input of described amplifier buffer connects the connected node of the 5th resistance and the 6th resistance, and the outfan of described amplifier buffer is coupled to judging unit.
14. monitor as claimed in claim 13, it is characterized in that: also comprise differential amplifier circuit, two inputs of described differential amplifier circuit connect two outfans of described bridge-type pressure sensor respectively, the outfan of described differential amplifier circuit is coupled to described judging unit, described judging unit is used for the output of described voltage derived circuit and described differential amplifier circuit and imposes a condition comparing, and judges the fault of described bridge-type pressure sensor.
15. monitor as claimed in claim 12, it is characterized in that: described voltage derived circuit comprises two amplifier buffers, the input of described two amplifier buffers connects the connected node of the connected node of the 4th resistance, the 5th resistance and the 6th resistance, the 7th resistance respectively, and the outfan of described two amplifier buffers is coupled to judging unit respectively.
16. electric bridge testing circuit, it is characterized in that: described circuit comprises the detection network that leads, voltage derived circuit and judging unit, described leading detected at least one end connection of network potential point, the described detection network that leads is used for being connected with two outfans of electric bridge, the input of described voltage derived circuit links to each other with the detection network that leads, the outfan of described voltage derived circuit links to each other with judging unit, described voltage derived circuit is used for two output end voltages of described electric bridge or voltage correlative are transmitted to described judging unit, described judging unit compares the voltage of electric bridge two outfans or voltage correlative with imposing a condition, and judges the fault of described electric bridge.
17. a bridge-type pressure sensor detection method is characterized in that, comprising:
Detect the voltage or the voltage correlative of bridge-type pressure sensor two outfans, testing circuit comprises the detection network that leads, and described leading detected network and make the input of testing circuit not unsettled after coming off leading;
More described voltage or voltage correlative and pre-conditioned;
Judge the fault of described bridge-type pressure sensor.
18. an electric bridge detection method is characterized in that, comprising:
Detect the voltage or the voltage correlative of electric bridge two outfans, testing circuit comprises the detection network that leads, and described leading detected network and make the input of testing circuit not unsettled after coming off leading;
More described voltage or voltage correlative and pre-conditioned;
Judge the fault of described electric bridge.
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| EP2465426A1 (en) * | 2010-12-20 | 2012-06-20 | General Electric Company | Biomedical sensor |
| CN104716952B (en) * | 2013-12-16 | 2018-07-06 | 中核兰州铀浓缩有限公司 | External equivalent device and equivalent regeneration method after the fracture of backflow sensor electric bridge |
| CN109975878B (en) * | 2017-12-27 | 2020-11-24 | 四川锦江电子科技有限公司 | Device and method for detecting falling of surface excitation electrode plate of three-dimensional mapping system |
| CN109443631A (en) * | 2018-12-05 | 2019-03-08 | 兰州飞行控制有限责任公司 | A kind of minute-pressure difference detecting circuit |
| CN112928348B (en) | 2019-04-30 | 2022-04-26 | 宁德时代新能源科技股份有限公司 | Battery thermal runaway detection method, device and system and battery management unit |
| WO2021022459A1 (en) | 2019-08-05 | 2021-02-11 | 深圳市汇顶科技股份有限公司 | Detection circuit of bridge sensor, chip and detection system |
| CN110794341A (en) * | 2019-11-19 | 2020-02-14 | 北京东方逸腾数码医疗设备技术有限公司 | Invasive sphygmomanometer lead falling detection circuit |
| CN112432721A (en) * | 2020-11-24 | 2021-03-02 | 武汉飞恩微电子有限公司 | Pressure sensor fault detection circuit and method and pressure sensor |
| CN112857406B (en) * | 2021-01-08 | 2023-05-23 | 重庆开谨科技有限公司 | High-voltage excitation Wheatstone bridge measurement method |
| CN113311365A (en) * | 2021-06-01 | 2021-08-27 | 深圳市思榕科技有限公司 | Pressure sensor broken string detection circuitry |
| CN115167372A (en) * | 2022-08-04 | 2022-10-11 | 潍柴动力股份有限公司 | Fault determination method, fault determination device, processor and electronic control unit |
| CN115574854B (en) * | 2022-12-05 | 2023-04-11 | 泉州昆泰芯微电子科技有限公司 | Fault diagnosis circuit device, fault diagnosis method, computer, storage medium, and program |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101006918A (en) * | 2007-01-05 | 2007-08-01 | 哈尔滨工业大学 | Integrated test-equipment of blood pressure, pulse and electrocardiograms |
-
2008
- 2008-11-13 CN CN200810217325XA patent/CN101732044B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101006918A (en) * | 2007-01-05 | 2007-08-01 | 哈尔滨工业大学 | Integrated test-equipment of blood pressure, pulse and electrocardiograms |
Non-Patent Citations (1)
| Title |
|---|
| 包旭鹤.《便携式电子血压计设计》.《现代电子技术》.2007,(第8期),7-10. * |
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Effective date of registration: 20180702 Address after: 518057 the 1-4 floor of MINDRAY building, science and technology south twelve Road, Nanshan District high tech Industrial Park, Shenzhen, Guangdong. Co-patentee after: SHENZHEN MINDRAY SCIENTIFIC Co.,Ltd. Patentee after: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS Co.,Ltd. Address before: 518057 MINDRAY science and technology south twelve road MINDRAY high tech Industrial Park, Shenzhen, Guangdong Patentee before: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS Co.,Ltd. |
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Application publication date: 20100616 Assignee: Shenzhen Mindray Animal Medical Technology Co.,Ltd. Assignor: SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS Co.,Ltd. Contract record no.: X2022440020009 Denomination of invention: A bridge-type pressure sensor detection circuit, detection method and monitor Granted publication date: 20110907 License type: Common License Record date: 20220804 |