CN105067080A - Capacitive liquid level detection device, method and system - Google Patents
Capacitive liquid level detection device, method and system Download PDFInfo
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- CN105067080A CN105067080A CN201510477392.5A CN201510477392A CN105067080A CN 105067080 A CN105067080 A CN 105067080A CN 201510477392 A CN201510477392 A CN 201510477392A CN 105067080 A CN105067080 A CN 105067080A
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Abstract
The invention discloses a capacitive liquid level detection device, method and system. The capacitive liquid level detection device comprises a liquid suction probe, an A/D conversion unit, a judgment unit and a comparison unit, wherein the liquid suction probe is used for sucking detected liquid and outputting a capacitance value of the liquid suction probe, the A/D conversion unit is used for sampling the capacitance value output by the liquid suction probe, converting the capacitance value into a corresponding digital voltage signal and outputting the corresponding digital voltage signal, the judgment unit is used for judging whether a voltage value of the currently-sampled digital voltage signal output by the A/D conversion unit is smaller than or equal to a voltage value of a previously-sampled digital voltage signal and outputting a voltage difference value when a judgment result is yes, and the comparison unit is used for comparing the voltage difference value with a preset threshold value and outputting a control signal for controlling the liquid suction probe to stop moving if the voltage difference value is greater than the preset threshold value. Existing liquid level detection steps are simplified, the accuracy of liquid level detection is improved, and the adaptability and stability are good.
Description
Technical field
The present invention relates to detecting liquid level field, particularly a kind of capacitive liquid-level detecting device, method and system.
Background technology
At present, in order to obtain the clinical diagnosis information of patient more accurately, increasing biochemical analysis testing instruments are used.The method that existing biochemical analyzer adopts capacitance level to respond to usually carries out detecting liquid level, and the method has and is quick on the draw, the feature that stability is higher.
Propose a kind of detection liquid level in prior art and judge whether successful method: detecting probe liquid level detector comprises: liquid absorbing probe, for drawing fluid to be measured and exporting himself electric capacity; Modular converter, for receiving the capacitance that liquid absorbing probe exports, and exports the analog voltage signal corresponding with capacitance; A/D converter, for being converted to digital voltage signal by analog voltage signal; Signal processing module, for processing the digital voltage signal received, exports contact liquid level indicator signal.Described signal processing module comprises: the first judging unit, receiving digital voltage signal, for judging whether the magnitude of voltage of current voltage signal is greater than low valve valve, and exporting the first control signal when the magnitude of voltage of current voltage signal is greater than low valve valve; The slope calculating neighboring voltage signals is started after receiving the first control signal.
Need in prior art the slope just starting to calculate neighboring voltage signals after the magnitude of voltage of current voltage signal is greater than low valve valve to be detected, but because the individual difference of instrument and the distributed capacitance impact of surrounding environment cause the threshold values of every platform instrument different, need during its detection again to demarcate corresponding detection threshold values according to different instrument and residing varying environment, the drawbacks such as this can cause debugging loaded down with trivial details, and step is complicated.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency existing in prior art, a kind of capacitive liquid-level detecting device, method and system are provided, are intended to simplify existing detecting liquid level step, improve the accuracy of detecting liquid level.
To achieve these goals, the technical solution used in the present invention is:
A kind of capacitive liquid-level detecting device, comprising:
Liquid absorbing probe, for drawing fluid to be measured and exporting himself electric capacity;
A/D converting unit, for the capacitance that described liquid absorbing probe of sampling exports, is converted to corresponding digital voltage signal and exports by described capacitance;
Judging unit, whether the magnitude of voltage for the digital voltage signal judging this sampling that described A/D converting unit exports is less than or equal to the magnitude of voltage of the digital voltage signal of sampling last time, when judged result is for being, output voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of digital voltage signal of sampling last time deducts the digital voltage signal of this sampling; And
Comparing unit, for the size of more described voltage difference and predetermined threshold, if described voltage difference is greater than described predetermined threshold, then exports the control signal for controlling described liquid absorbing probe stop motion.
Preferably, described A/D converting unit is specifically for exporting once corresponding digital voltage signal at interval of schedule time sampling.
Further, the described schedule time is 63 microseconds to 1 millisecond.
Preferably, this capacitive liquid-level detecting device also comprises voltage difference summing elements and control module;
Described judging unit specifically for: a) judge whether the magnitude of voltage of the digital voltage signal of the N time sampling that described A/D converting unit exports is less than or equal to the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, if the determination result is YES, then output voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling deducts the digital voltage signal of the N time sampling, N >=2, and N is integer;
Described voltage difference summing elements is used for: b) receive described voltage difference, and the variable S-phase being zero by described voltage difference and initial value adds;
Described comparing unit also for: c) comparing the currency of S and the size of described predetermined threshold, if the currency of S is greater than described predetermined threshold, then exporting the control signal for controlling described liquid absorbing probe stop motion;
Described control module, for when the currency of S is not more than described predetermined threshold, by the value of N from increasing 1, controlling described judging unit, voltage difference summing elements and comparing unit and circulating that above-mentioned a), b), c) process is until S is greater than described predetermined threshold successively.
Preferably, described control module also for: when the magnitude of voltage that the judged result of described judging unit is the digital voltage signal of the N time sampling is greater than the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, the currency of described variable S is reset, by the value of N from increasing 1, control described judging unit, voltage difference summing elements and comparing unit again circulate successively above-mentioned a), b), c) process.
Preferably, described control module also for: after the comparative result of the described comparing unit currency that is S is greater than described predetermined threshold and exports described control signal, the currency of described variable S is reset, by the value of N from increasing 1, control described judging unit, voltage difference summing elements and comparing unit again circulate successively above-mentioned a), b), c) process.
Preferably, described judging unit and comparing unit are integrated in same processor, integrated circuit or programming device.
Preferably, also comprise isolation DC-DC power module, for powering for A/D converting unit, the ripple of described DC-DC power module is less than 30mVp-p when 20MHZ bandwidth.
Preferably, described reservation threshold is relevant to the surface area size of the liquid held in container, if the surface area of liquid is less than predetermined value, then described reservation threshold reduces and corresponding reduction with the surface area of described liquid; If the surface area of described liquid is greater than described predetermined value, then described reservation threshold remains unchanged with the surface area increase of described liquid.
The embodiment of the present invention also provides a kind of capacitance level detection method, comprises the steps:
The capacitance that sampling liquid absorbing probe exports, is converted to corresponding digital voltage signal and exports by described capacitance;
Judge whether the magnitude of voltage of this digital voltage signal of sampling is less than or equal to the magnitude of voltage of the digital voltage signal of sampling last time, when judged result is for being, exports this voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of digital voltage signal of sampling last time deducts the digital voltage signal of this sampling;
The size of more described voltage difference and predetermined threshold, if described voltage difference is greater than described predetermined threshold, then exports the control signal for controlling described liquid absorbing probe stop motion.
Preferably, the capacitance that described sampling liquid absorbing probe exports, is converted to the digital voltage signal of correspondence by described capacitance and the step of output is specially: the digital voltage signal exporting once correspondence at interval of schedule time sampling.
Further, the described schedule time is 63 microseconds to 1 millisecond.
Preferably, the method is further comprising the steps of:
A) judge whether the magnitude of voltage of the digital voltage signal of sampling for the N time is less than or equal to the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, if the determination result is YES, then output voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling deducts the digital voltage signal of the N time sampling, N >=2, and N is integer;
B) receive described voltage difference, the variable S-phase being zero by described voltage difference and initial value adds;
C) comparing the currency of S and the size of described predetermined threshold, if the currency of S is greater than described predetermined threshold, then exporting the control signal for controlling described liquid absorbing probe stop motion;
D) when the currency of S is not more than described predetermined threshold, by the value of N from increasing 1, circulating successively, above-mentioned a), b), c) process is until S is greater than described predetermined threshold.
Preferably, the method also comprises: when the magnitude of voltage that described judged result is the digital voltage signal of the N time sampling is greater than the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, the currency of described variable S is reset, by the value of N from increasing 1, again circulate successively above-mentioned a), b), c) process.
Preferably, the method also comprises: after the currency of S is greater than described predetermined threshold and exports described control signal, is reset by the currency of described variable S, by the value of N from increasing 1, again circulate successively above-mentioned a), b), c) process.
Described reservation threshold is relevant to the surface area size of the liquid held in container, if the surface area of liquid is less than predetermined value, then described reservation threshold reduces and corresponding reduction with the surface area of described liquid; If the surface area of described liquid is greater than described predetermined value, then described reservation threshold remains unchanged with the surface area increase of described liquid.
The embodiment of the present invention also provides a kind of capacitance level detection system, comprises above-mentioned capacitive liquid-level detecting device and probe motion control device; Described probe motion control device is connected with described capacitive liquid-level detecting device, for when receiving the described control signal that described comparing unit exports, controlling described liquid absorbing probe stop descending and carry out imbitition action according to described control signal.
Described probe motion control device comprises: motion, and it installs described liquid absorbing probe, for moving under control module control thus driving described liquid absorbing probe to move up and down; And control module, being connected with described motion, for when receiving described control signal, controlling described motion stop motion, thus make described liquid absorbing probe stop moving downward.
compared with prior art, beneficial effect of the present invention:
The present invention is by judging whether the magnitude of voltage of this digital voltage signal of sampling is less than or equal to the magnitude of voltage of the digital voltage signal of sampling last time, when judged result is for being, output voltage difference, the size of more described voltage difference and predetermined threshold again, if described voltage difference is greater than described predetermined threshold, then export the control signal for controlling described liquid absorbing probe stop motion.The present invention adopts the relative variation (i.e. voltage difference) of data as detecting liquid level whether successfully basis for estimation, can avoid the problem causing the threshold values of every platform instrument different due to the impact of the individual difference of instrument and the distributed capacitance of surrounding environment in prior art.Once set corresponding predetermined threshold in the present invention, then without the need to environmentally or instrument individual difference and again debug and arrange its judgment threshold, can accomplish the effect of exempting to debug to simplify existing detecting liquid level step, improve the accuracy of detecting liquid level.By using high-quality insulating power supply module when 20MHZ bandwidth (ripple be less than 30mVp-p) to make signal fluctuation little in preferred version, data stabilization, increase effectively the resolution of data, greatly strengthen the adaptability of detecting liquid level, stability and reliability.
accompanying drawing illustrates:
Fig. 1 is the capacitive liquid-level detecting device schematic diagram in the embodiment of the present invention;
Fig. 2 is another capacitive liquid-level detecting device schematic diagram in the embodiment of the present invention;
Fig. 3 is the detection principle schematic diagram of the liquid detection device in the embodiment of the present invention;
Fig. 4 is the capacitance level detection method process flow diagram in the embodiment of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.But this should be interpreted as that the scope of the above-mentioned theme of the present invention is only limitted to following embodiment, all technology realized based on content of the present invention all belong to scope of the present invention.
Capacitive liquid-level detecting device as shown in Figure 1, comprises liquid absorbing probe 101, A/D converting unit 102, judging unit 103 and comparing unit 104.
Described liquid absorbing probe 101, for drawing fluid to be measured and exporting himself electric capacity; Described A/D converting unit 102, for the capacitance that described liquid absorbing probe of sampling exports, is converted to corresponding digital voltage signal and exports by described capacitance; Described judging unit 103, whether the magnitude of voltage for the digital voltage signal judging this sampling that described A/D converting unit 102 exports is less than or equal to the magnitude of voltage of the digital voltage signal of sampling last time, when judged result is for being, output voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of digital voltage signal of sampling last time deducts the digital voltage signal of this sampling; Described comparing unit 104, for the size of more described voltage difference and predetermined threshold, if described voltage difference is greater than described predetermined threshold, then exports the control signal for controlling the stop motion of described liquid absorbing probe 101.
The present invention is by judging whether the magnitude of voltage of this digital voltage signal of sampling is less than or equal to the magnitude of voltage of the digital voltage signal of sampling last time, when judged result is for being, output voltage difference, the size of more described voltage difference and predetermined threshold again, if described voltage difference is greater than described predetermined threshold, then export the control signal for controlling described liquid absorbing probe stop motion.The present invention adopts the relative variation (i.e. voltage difference) of data as detecting liquid level whether successfully basis for estimation, can avoid the problem causing the threshold values of every platform instrument different due to the impact of the individual difference of instrument and the distributed capacitance of surrounding environment in prior art.Once set corresponding predetermined threshold in the present invention, then without the need to environmentally or instrument individual difference and again debug and arrange its judgment threshold, can accomplish the effect of exempting to debug to simplify existing detecting liquid level step, improve the accuracy of detecting liquid level.
Concrete, in one embodiment, described A/D converting unit 102 is specifically for exporting once corresponding digital voltage signal at interval of schedule time sampling.The schedule time described in the present embodiment is 63 microseconds to 1 millisecond.Referring to Fig. 2, the capacitive liquid-level detecting device in the present embodiment also comprises voltage difference summing elements 105 and control module 106.Described judgement is single, 103 specifically for: a) judge whether the magnitude of voltage of the digital voltage signal of the N time sampling that described A/D converting unit exports is less than or equal to the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, if the determination result is YES, then output voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling deducts the digital voltage signal of the N time sampling, and N >=2, N is integer.Described voltage difference summing elements 105 for: b) receive described voltage difference, the variable S-phase being zero by described voltage difference and initial value adds.Described comparing unit 104 also for: c) comparing the currency of S and the size of described predetermined threshold, if the currency of S is greater than described predetermined threshold, then exporting the control signal for controlling described liquid absorbing probe stop motion.Described control module 106, for when the currency of S is not more than described predetermined threshold, by the value of N from increasing 1, controlling described judging unit 103, voltage difference summing elements 105 and comparing unit 104 and circulating that above-mentioned a), b), c) process is until S is greater than described predetermined threshold successively.
Optionally, described control module 106 also for: when the magnitude of voltage that the judged result of described judging unit 103 is the digital voltage signal of the N time sampling is greater than the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, the currency of described variable S is reset, by the value of N from increasing 1, control described judging unit 103, voltage difference summing elements 105 and comparing unit 104 again circulate successively above-mentioned a), b), c) process.
Optionally, described control module 106 also for: after the comparative result of described comparing unit 104 currency that is S is greater than described predetermined threshold and exports described control signal, the currency of described variable S is reset, by the value of N from increasing 1, control described judging unit 103, voltage difference summing elements 105 and comparing unit 104 again circulate successively above-mentioned a), b), c) process.
Below in conjunction with an object lesson, said process is described: the present embodiment is applied to the detecting liquid level of chemical illumination immunity analysis instrument, referring to Fig. 3, device comprises sample probe 1, testing circuit 7, motion-control module 5, sample cup 2, sample cup bracket 4, movement arm 3, capacitance signal transfer wire 6.Sample probe 1 is connected by signal transmission wire 6 with testing circuit 7, motion-control module 5 control step motor (not shown) brought into motion arm 3 thus drive probe 1 move downward, in decline process, sample probe 1 senses capacitance variations and signal is transferred to testing circuit 7 by wire 6.Capacitance signal is converted to digital signal to testing circuit 7 and iteration carries out above-mentioned judgement, comparison procedure, finally outputs a control signal to motion-control module 5.Motion-control module 5 controls motor to be stopped thus making sample probe stop descending and carry out sucking action.In the present embodiment, testing circuit 7 is integrated with the function of described A/D converting unit 102, judging unit 103 and comparing unit 104.
Concrete, principle of work of the present invention is specially: (get 63 microseconds in the present embodiment at interval of the T moment, can certainly be other numerical value, but be no more than Millisecond) read primary sample probe export electric capacity AD value, judge whether this sampled value is less than or equal to sampled value last time.If so, define N number of variable, N value can be arranged according to actual conditions.If be respectively: a1, a2 ... aN also resets.By voltage difference stored in aN.If AA=a1+a2+ ... + aN, judges whether AA is greater than the successful reservation threshold of detection (get 14 in the present embodiment, also can arrange as the case may be), if then export control signal by a1, a2 ... aN resets, otherwise a1=a2; A2=a3; A (N-1)=aN; AN=0, carries out the judgement comparison procedure of next round, loop iteration successively.If each circulation judges that this sampled value is greater than sampled value last time, then by a1, a2 ... aN resets, and reading sampled value continues judge and carry out follow-up comparison procedure again.The present invention can significantly improve the adaptability of pick-up unit, effectively prevent and surveys by mistake, improve security performance and the accuracy of whole chemiluminescence immunoassay system.
Wherein said reservation threshold is relevant to the surface area size of the liquid held in instrument containers (as sample cup), (can arrange as the case may be if the surface area of liquid is less than predetermined value, different according to the difference of instrument), then described reservation threshold reduces with the surface area of described liquid and correspondingly to reduce; If the surface area of described liquid is greater than described predetermined value, then described reservation threshold remains unchanged with the surface area increase of described liquid.
Optionally, described judging unit 103 and comparing unit 104 are integrated in same processor (as single-chip microcomputer), integrated circuit or programming device.This device also comprises isolation DC-DC power module (not shown), and for powering for A/D converting unit 102 and described processor, integrated circuit or programming device, the ripple of described DC-DC power module is less than 30mVp-p when 20MHZ bandwidth.Power due to instrument and usually adopt Switching Power Supply, its Ripple Noise is larger, in order to strengthen detecting liquid level adaptability, in circuit design, increasing low ripple isolation DC-DC module, for testing circuit provides stabilized power source, making signal fluctuation little by using high-quality insulating power supply module when 20MHZ bandwidth (ripple be less than 30mVp-p), data stabilization, increase effectively the resolution of data, greatly strengthen the adaptability of detecting liquid level, stability and reliability.
Based on same design, the embodiment of the present invention 2 provides a kind of capacitance level detection method, and referring to Fig. 4, in the present embodiment, the method performs based on the device in above-described embodiment, specifically comprises the steps:
The capacitance that S101, sampling liquid absorbing probe export, is converted to corresponding digital voltage signal and exports by described capacitance;
S102, judge whether the magnitude of voltage of this digital voltage signal of sampling is less than or equal to the magnitude of voltage of digital voltage signal of sampling last time, when judged result is for being, exports this voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of digital voltage signal of sampling last time deducts the digital voltage signal of this sampling;
The size of S103, more described voltage difference and predetermined threshold, if described voltage difference is greater than described predetermined threshold, then exports the control signal for controlling described liquid absorbing probe stop motion.
Preferably, the capacitance that described sampling liquid absorbing probe exports, is converted to the digital voltage signal of correspondence by described capacitance and the step of output is specially: the digital voltage signal exporting once correspondence at interval of schedule time sampling.
Further, the described schedule time is 63 microseconds to 1 millisecond.
Preferably, the method is further comprising the steps of:
A) judge whether the magnitude of voltage of the digital voltage signal of sampling for the N time is less than or equal to the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, if the determination result is YES, then output voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling deducts the digital voltage signal of the N time sampling, N >=2, and N is integer;
B) receive described voltage difference, the variable S-phase being zero by described voltage difference and initial value adds;
C) comparing the currency of S and the size of described predetermined threshold, if the currency of S is greater than described predetermined threshold, then exporting the control signal for controlling described liquid absorbing probe stop motion;
D) when the currency of S is not more than described predetermined threshold, by the value of N from increasing 1, circulating successively, above-mentioned a), b), c) process is until S is greater than described predetermined threshold.
Preferably, the method also comprises: when the magnitude of voltage that described judged result is the digital voltage signal of the N time sampling is greater than the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, the currency of described variable S is reset, by the value of N from increasing 1, again circulate successively above-mentioned a), b), c) process.
Preferably, the method also comprises: after the currency of S is greater than described predetermined threshold and exports described control signal, is reset by the currency of described variable S, by the value of N from increasing 1, again circulate successively above-mentioned a), b), c) process.
Below in conjunction with an object lesson, said process is described: the present embodiment is applied to the detecting liquid level of chemical illumination immunity analysis instrument, please referring again to Fig. 3, device comprises sample probe 1, testing circuit 7, motion-control module 5, sample cup 2, sample cup bracket 4, movement arm 3, capacitance signal transfer wire 6.Sample probe 1 is connected by signal transmission wire 6 with testing circuit 7, motion-control module 5 control step motor (not shown) brought into motion arm 3 thus drive probe 1 move downward, in decline process, sample probe 1 senses capacitance variations and signal is transferred to testing circuit 7 by wire 6.Capacitance signal is converted to digital signal to testing circuit 7 and iteration carries out above-mentioned judgement, comparison procedure, finally outputs a control signal to motion-control module 5.Motion-control module 5 controls motor to be stopped thus making sample probe stop descending and carry out sucking action.In the present embodiment, testing circuit 7 is integrated with the function of described A/D converting unit, judging unit and comparing unit.
Concrete, principle of work of the present invention is specially: (get 63 microseconds in the present embodiment at interval of the T moment, can certainly be other numerical value, but be no more than Millisecond) read primary sample probe export electric capacity AD value, judge whether this sampled value is less than or equal to sampled value last time.If so, define N number of variable, N value can be arranged according to actual conditions.If be respectively: a1, a2 ..., aN resetting.By voltage difference stored in aN.If AA=a1+a2+ ... + aN, judges whether AA is greater than the successful reservation threshold of detection (get 14 in the present embodiment, also can arrange as the case may be), if then export control signal by a1, a2 ... aN resets, otherwise a1=a2; A2=a3; A (N-1)=aN; AN=0, carries out the judgement comparison procedure of next round, loop iteration successively.If each circulation judges that this sampled value is greater than sampled value last time, then by a1, a2 ... aN resets, and reading sampled value continues judge and carry out follow-up comparison procedure again.The present invention can significantly improve the adaptability of pick-up unit, effectively prevent and surveys by mistake, improve security performance and the accuracy of whole chemiluminescence immunoassay system.
Wherein said reservation threshold is relevant to the surface area size of the liquid held in instrument containers (as sample cup), (can arrange as the case may be if the surface area of liquid is less than predetermined value, different according to the difference of instrument), then described reservation threshold reduces with the surface area of described liquid and correspondingly to reduce; If the surface area of described liquid is greater than described predetermined value, then described reservation threshold remains unchanged with the surface area increase of described liquid.It should be noted that, the method embodiment and above-mentioned device embodiment are made based on same design, specifically with reference to the related content in said apparatus embodiment, no longer can describe in detail herein.
The embodiment of the present invention 3 also provides a kind of capacitance level detection system, comprises above-mentioned capacitive liquid-level detecting device (Fig. 1 or Fig. 2 shown device) and probe motion control device (not shown); Described probe motion control device is connected with described capacitive liquid-level detecting device, for when receiving the described control signal that described comparing unit exports, controlling described liquid absorbing probe stop descending and carry out imbitition action according to described control signal.
Wherein said probe motion control device comprises: motion (as movement arm), and it installs described liquid absorbing probe, for moving under control module control thus driving described liquid absorbing probe to move up and down; And control module, being connected with described motion, for when receiving described control signal, controlling described motion stop motion, thus make described liquid absorbing probe stop moving downward.Control module can comprise control circuit and motor, and this part specifically referring to the description about Fig. 3 content, no longer can describe in detail herein.
Present system can accurately export detecting liquid level pass signal, makes the master control system of instrument send correct operation signal to liquid absorbing probe, improves the success ratio of liquid absorbing probe sampling imbibition, avoids malfunction to damage liquid absorbing probe or instrument and equipment miscellaneous part.
By reference to the accompanying drawings the specific embodiment of the present invention is described in detail above, but the present invention is not restricted to above-mentioned embodiment, in the spirit and scope situation of claim not departing from the application, those skilled in the art can make various amendment or remodeling.
Claims (16)
1. a capacitive liquid-level detecting device, is characterized in that, comprising:
Liquid absorbing probe, for drawing fluid to be measured and exporting himself electric capacity;
A/D converting unit, for the capacitance that described liquid absorbing probe of sampling exports, is converted to corresponding digital voltage signal and exports by described capacitance;
Judging unit, whether the magnitude of voltage for the digital voltage signal judging this sampling that described A/D converting unit exports is less than or equal to the magnitude of voltage of the digital voltage signal of sampling last time, when judged result is for being, output voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of digital voltage signal of sampling last time deducts the digital voltage signal of this sampling; And
Comparing unit, for the size of more described voltage difference and predetermined threshold, if described voltage difference is greater than described predetermined threshold, then exports the control signal for controlling described liquid absorbing probe stop motion.
2. capacitive liquid-level detecting device according to claim 1, is characterized in that, described A/D converting unit is specifically for exporting once corresponding digital voltage signal at interval of schedule time sampling.
3. capacitive liquid-level detecting device according to claim 2, is characterized in that, the described schedule time is 63 microseconds to 1 millisecond.
4. the capacitive liquid-level detecting device according to Claims 2 or 3, is characterized in that, also comprises voltage difference summing elements and control module;
Described judging unit specifically for: a) judge whether the magnitude of voltage of the digital voltage signal of the N time sampling that described A/D converting unit exports is less than or equal to the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, if the determination result is YES, then output voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling deducts the digital voltage signal of the N time sampling, N >=2, and N is integer;
Described voltage difference summing elements is used for: b) receive described voltage difference, and the variable S-phase being zero by described voltage difference and initial value adds;
Described comparing unit also for: c) comparing the currency of S and the size of described predetermined threshold, if the currency of S is greater than described predetermined threshold, then exporting the control signal for controlling described liquid absorbing probe stop motion;
Described control module, for when the currency of S is not more than described predetermined threshold, by the value of N from increasing 1, controlling described judging unit, voltage difference summing elements and comparing unit and circulating that above-mentioned a), b), c) process is until S is greater than described predetermined threshold successively.
5. capacitive liquid-level detecting device according to claim 4, it is characterized in that, described control module also for: when the magnitude of voltage that the judged result of described judging unit is the digital voltage signal of the N time sampling is greater than the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, the currency of described variable S is reset, by the value of N from increasing 1, control described judging unit, voltage difference summing elements and comparing unit again circulate successively above-mentioned a), b), c) process.
6. capacitive liquid-level detecting device according to claim 4, it is characterized in that, described control module also for: after the comparative result of the described comparing unit currency that is S is greater than described predetermined threshold and exports described control signal, the currency of described variable S is reset, by the value of N from increasing 1, control described judging unit, voltage difference summing elements and comparing unit again circulate successively above-mentioned a), b), c) process.
7. capacitive liquid-level detecting device according to claim 6, is characterized in that, also comprises isolation DC-DC power module, and for powering for A/D converting unit, the ripple of described DC-DC power module is less than 30mVp-p when 20MHZ bandwidth.
8. capacitive liquid-level detecting device according to claim 4, it is characterized in that, described reservation threshold is relevant to the surface area size of the liquid held in container, if the surface area of liquid is less than predetermined value, then described reservation threshold reduces and corresponding reduction with the surface area of described liquid; If the surface area of described liquid is greater than described predetermined value, then described reservation threshold remains unchanged with the surface area increase of described liquid.
9. a capacitance level detection method, is characterized in that, comprises the steps:
The capacitance that sampling liquid absorbing probe exports, is converted to corresponding digital voltage signal and exports by described capacitance;
Judge whether the magnitude of voltage of this digital voltage signal of sampling is less than or equal to the magnitude of voltage of the digital voltage signal of sampling last time, when judged result is for being, exports this voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of digital voltage signal of sampling last time deducts the digital voltage signal of this sampling;
The size of more described voltage difference and predetermined threshold, if described voltage difference is greater than described predetermined threshold, then exports the control signal for controlling described liquid absorbing probe stop motion.
10. capacitance level detection method according to claim 9, it is characterized in that, the capacitance that described sampling liquid absorbing probe exports, is converted to the digital voltage signal of correspondence by described capacitance and the step of output is specially: the digital voltage signal exporting once correspondence at interval of schedule time sampling.
11. capacitance level detection methods according to claim 10, is characterized in that, the described schedule time is 63 microseconds to 1 millisecond.
12. capacitance level detection methods according to claim 10 or 11, is characterized in that, also comprise:
A) judge whether the magnitude of voltage of the digital voltage signal of sampling for the N time is less than or equal to the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, if the determination result is YES, then output voltage difference; Wherein, described voltage difference is the magnitude of voltage that the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling deducts the digital voltage signal of the N time sampling, N >=2, and N is integer;
B) receive described voltage difference, the variable S-phase being zero by described voltage difference and initial value adds;
C) comparing the currency of S and the size of described predetermined threshold, if the currency of S is greater than described predetermined threshold, then exporting the control signal for controlling described liquid absorbing probe stop motion;
D) when the currency of S is not more than described predetermined threshold, by the value of N from increasing 1, circulating successively, above-mentioned a), b), c) process is until S is greater than described predetermined threshold.
13. capacitance level detection methods according to claim 12, it is characterized in that, also comprise: when the magnitude of voltage that described judged result is the digital voltage signal of the N time sampling is greater than the magnitude of voltage of the digital voltage signal of (N-1) secondary sampling, the currency of described variable S is reset, by the value of N from increasing 1, again circulate successively above-mentioned a), b), c) process.
14. capacitance level detection methods according to claim 12, it is characterized in that, also comprise: after the currency of S is greater than described predetermined threshold and exports described control signal, the currency of described variable S is reset, by the value of N from increasing 1, again circulate successively above-mentioned a), b), c) process.
15. capacitance level detection methods according to claim 12, it is characterized in that, described reservation threshold is relevant to the surface area size of the liquid held in container, if the surface area of liquid is less than predetermined value, then described reservation threshold reduces and corresponding reduction with the surface area of described liquid; If the surface area of described liquid is greater than described predetermined value, then described reservation threshold remains unchanged with the surface area increase of described liquid.
16. 1 kinds of capacitance level detection systems, is characterized in that, comprising:
Capacitive liquid-level detecting device described in any one of claim 1-8;
Probe motion control device, is connected with described capacitive liquid-level detecting device, for when receiving the described control signal that described comparing unit exports, controlling described liquid absorbing probe stop descending and carry out imbitition action according to described control signal;
Wherein said probe motion control device comprises:
Motion, it installs described liquid absorbing probe, for moving under control module control thus driving described liquid absorbing probe to move up and down;
Control module, is connected with described motion, for when receiving described control signal, controls described motion stop motion, thus makes described liquid absorbing probe stop moving downward.
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