CN103052745B - Household appliance for drying laundry items and method for determining a measurement variable correlated to a level of dryness - Google Patents
Household appliance for drying laundry items and method for determining a measurement variable correlated to a level of dryness Download PDFInfo
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- CN103052745B CN103052745B CN201180038226.5A CN201180038226A CN103052745B CN 103052745 B CN103052745 B CN 103052745B CN 201180038226 A CN201180038226 A CN 201180038226A CN 103052745 B CN103052745 B CN 103052745B
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- washings
- measurement electrode
- electromotive force
- measurement
- home appliances
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/18—Condition of the laundry, e.g. nature or weight
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/02—Characteristics of laundry or load
- D06F2103/08—Humidity
- D06F2103/10—Humidity expressed as capacitance or resistance
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/44—Current or voltage
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/08—Control circuits or arrangements thereof
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F58/00—Domestic laundry dryers
- D06F58/32—Control of operations performed in domestic laundry dryers
- D06F58/34—Control of operations performed in domestic laundry dryers characterised by the purpose or target of the control
- D06F58/36—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry
- D06F58/38—Control of operational steps, e.g. for optimisation or improvement of operational steps depending on the condition of the laundry of drying, e.g. to achieve the target humidity
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
Abstract
The invention relates to a household appliance 1 for drying laundry items 3, wherein the momentary level of dryness of the laundry items 3 is to be particularly reliably determined. A measuring device 5 is provided in the household appliance 1 for determining a measurement variable 4, Uw, correlated to the level of dryness of the laundry items 3. The measuring device 5 comprises two measurement electrodes 6, 7 spaced apart from each other and a circuit configuration 8 coupled to the measurement electrodes 6, 7, bringing about a current flow I through the measurement electrodes 6, 7, capturing an electrical laundry voltage drop Uw between the measurement electrodes 6, 7, and deriving the measurement variable 4, Uw, as a function thereof. A direction of the current flow I through the measurement electrodes 6, 7 is changed repeatedly. Galvanic effects at the measurement electrodes 6, 7 are thus prevented.
Description
Technical field
The present invention relates to a kind of home appliances for dry washing material.This home appliances comprises the measurement mechanism for determining the measurement parameter relevant to washings aridity.This measurement mechanism comprises two measurement electrode of arranging at each interval, and these two measurement electrode are so arranged in home appliances, make measurement electrode contact washings to be dried in the operation of home appliances.Measurement mechanism also comprises the circuit arrangement be coupled with measurement electrode.Circuit arrangement can cause the electric current by measurement electrode, senses the washings voltage that declines between measurement electrode and draws measurement parameter according to the washings voltage of sensing.The invention still further relates to a kind of method for determining the measurement parameter relevant to washings aridity in home appliances by measurement mechanism, washings is dried in this home appliances.
Background technology
Know that the aridity of the washings in dryer for washings or scrubbing-and-drying unit is prior art.If washings with dry according to the rules, then can terminate dry run by this way.Current interest is especially conducting value or the Ohmic resistance of measuring washings.The aridity of washings then instead can be released by conducting value; Conducting value is the tolerance of aridity.Apply to the following relationship: the conducting value of washings resistance that is less or washings is larger, and washings is drier.
The conducting value of washings can such as draw by DC current, and DC current flows through washings due to the DC voltage be applied on electrode.Be that DC current can be forced to cause chemical reaction in this shortcoming, and may occur electroplating effect.The polarizing voltage relevant to washings aridity is formed due to plating effect.This polarizing voltage makes the measured value distortion of the resistance of washings usually.A kind of method described in this is as document EP0942094B1 can realize remedying.Determine the polarizing voltage between measurement electrode and washings in the method, and consider this polarizing voltage when determining the conducting value of washings.Polarizing voltage is deducted from washings voltage.In the prior art, determining conducting value and determining to have to pass through one period of ineffective time between polarizing voltage, by the current interruptions of washings or at least strongly reduce during this ineffective time, this situation is considered shortcoming again.This ineffective time can reach 10 seconds.Thus, the aridity of washings can not be determined fast or determine instantaneous aridity at that time.
Summary of the invention
Task of the present invention is, provides a kind of approach, how can draw the instantaneous at that time aridity of washings in the home appliances of the described type of beginning, the result not distortion because of polarizing voltage.
This task is solved by a kind of home appliances and a kind of method respectively with the feature of corresponding independent claims according to the present invention.Favourable enforcement of the present invention is the object of dependent claims and following explanation.
Home appliances according to the present invention is configured to dry washing material.This home appliances comprises measurement mechanism, and this measurement mechanism is for determining the measurement parameter relevant to washings aridity.Measurement mechanism comprises two measurement electrode of arranging at each interval.Measurement electrode can contact washings to be dried in the operation of home appliances.Measurement mechanism also comprises the circuit arrangement be coupled with measurement electrode.Circuit arrangement constructs for generation of the electric current by measurement electrode, senses the washings voltage that declines between measurement electrode and draws measurement parameter according to the washings voltage of sensing.Circuit arrangement so constructs, and make in home appliances runs, the sense of current flowing through measurement electrode converts repeatedly, especially periodically.
Thus, realize a kind of effect according to the present invention, that is, unlike the prior art, what be conducted through measurement electrode can be described as alternating current, instead of DC current.Namely the sense of current converts repeatedly.Reach by this way and highly accurately determine to measure parameter, measure the measurement not distortion because of plating effect of parameter.Namely prevent from forming polarizing voltage between washings and measurement electrode by the conversion of the sense of current.Thus, different from the content of document EP0942094B1, need not try to achieve polarizing voltage and measure parameter no longer needs to correct.Compared with the prior art, must not wait until ineffective time goes over now, but measurement parameter can be drawn rapidly.The instantaneous value at that time measuring parameter can be determined thus.
The measurement parameter relevant to washings aridity is drawn by measurement mechanism.Such as can determine that aridity itself (being perhaps percentage) and/or the conducting value of washings and/or the ohmic resistance of washings are as measurement parameter.But addedly or alternatively, also can regard the washings voltage declined on washings as measurement parameter.
Can be realized with mode in different forms by the conversion of the sense of current of measurement electrode.Such as can realize as follows: one alternately in measurement electrode applies an electromotive force and in another measurement electrode of correspondence, applies an electromotive force different from this electromotive force.This means, the time point determined an electrode in these electrodes to exist lower electromotive force, and there is higher electromotive force in another measurement electrode.These electromotive forces can repeatedly with interchangeable with one another, makes to be applied to voltage on electrode correspondingly reverse repeatedly thus.By this way can with minimum technology spending apply between measurement electrode rectangle, the voltage of periodic transformation, and produce rectangle, the electric current of periodic transformation.In addition, prevent from forming polarizing voltage between measurement electrode and washings by this measure.That is, in this embodiment bipolarlyly and electricity measurement parameter symmetrically, because the electromotive force be applied in measurement electrode exchanges or reverse repeatedly.
As already explained, can periodically be converted by the sense of current of measurement electrode.Such as so can construct circuit arrangement, make the sense of current with a frequency transformation, this frequency is in the codomain from 300Hz to 500Hz.This frequency can be such as 400Hz.Thus, the pulse length of voltage pulse or current impulse is relatively short, thus the plating effect in measurement electrode is lowered to minimum.In addition can relatively quickly, in millisecond scope, namely implement the measurement of conducting value.
In the circuit arrangement, especially described measurement parameter is drawn according to the washings voltage declined when electric current flows through the washings between two measurement electrode.Arrange in one embodiment, carrying for determining to measure parameter and quote the different value of two of washings voltage: be the washings voltage value produced for a direction of electric current on the one hand, is the washings voltage value produced for the other direction of electric current on the other hand.Namely in this embodiment, for the both direction sensing washings voltage of electric current, and be worth measurement parameter according to two of washings voltage.Measurement parameter can also be drawn more accurately by this way.Namely reach with this approach: the plating effect that may still occur is on determining that the impact of measuring parameter is totally reduced to zero.Ideally, the washings voltage of two senses of current numerically should be equal.If determine now to there is difference between the washings voltage that produces on a direction of electric current and the washings voltage produced on the other direction of electric current, then this is because plating effect forms parasitic antenna, mark as stray voltage source between measurement electrode.Thus, for determining to measure parameter, the mean value of the washings voltage value that a direction of electric current produces and the washings voltage value produced on the other direction of electric current can be used in.Measurement parameter can be drawn thus pin-point accuracy.
In one embodiment, circuit arrangement has divider, and this divider comprises the washings Ohmic resistance be coupled in measurement electrode of washings.In this embodiment by divider generation current.Can sense with minimum cost and the high degree of accuracy washings voltage declined on washings by using divider.
This divider can have the first Ohmic resistance and the second Ohmic resistance.By the first resistance, the first measurement electrode in measurement electrode can alternately be coupled with the first electromotive force and the second electromotive force being different from the first electromotive force.And by the second resistance, the second measurement electrode alternately can be coupled with the first electromotive force and the second electromotive force on the contrary with the first measurement electrode.This means, the second measurement electrode always with the first measurement electrode is differently coupled with another electromotive force.The time point determined for one thus, the first measurement electrode can be coupled with the first electromotive force, and the second measurement electrode is coupled with the second electromotive force.And at future time point, the first measurement electrode is coupled with the second electromotive force, the second measurement electrode is coupled with the first electromotive force.Namely in this embodiment, the Ohmic resistance of washings and the first and second resistant series and voltage decline on this series circuit, and this voltage drop equals the difference between the first electromotive force and the second electromotive force.Reach with this approach, produce the symmetrical current by measurement electrode, the current strength of symmetrical current is equal for the both direction of electric current.Can prevent from thus just electroplating effect.
First electromotive force is preferably positive potential.First electromotive force can such as be in the codomain from 3V to 7V; It can be such as 5V.Second electromotive force is positive potential low compared with the first electromotive force or reference potential (ground connection), the especially electromotive force of 0V preferably.Thus, for producing the voltage of transformation of rectangle, a positive potential is only needed; This circuit arrangement is without the need to negative potential-namely relative to the negative potential of reference potential.Save thus and produce negative potential and associated shortcoming, i.e. additional member and relative cost.
Circuit arrangement also can have second divider different from the first divider.Second divider can have all-in resistance numerically larger compared with the first divider.Circuit arrangement can so construct, and makes to reach predetermined value after-current at measurement parameter and walks around the first divider, namely walks around the resistance of the first divider and be conducted through the second divider.Second divider also can comprise the washings resistance of washings.The larger measurement category measuring parameter totally can be realized by this measure mode.This embodiment is based on such fact, that is, the Ohmic resistance of washings is increasing during dry run.The amplitude of the washings voltage sensed between measurement electrode thus also becomes large.If measure now parameter (such as washings resistance) to reach predetermined value after-current by the second divider conduction than first divider height ohm, then the dividing potential drop (washings voltage) intercepted in measurement electrode reduces.Thus, the amplitude of washings voltage remains on one and determines in codomain, and can use the microcontroller for calculating washings voltage, and microcontroller can measure washings voltage in limited codomain.In addition this embodiment has this advantage: can have better resolution ratio and measure the washings voltage declined between measurement electrode with having very high degree of precision degree thus.
Second divider can have two Ohmic resistances equally, i.e. the first resistance and the second resistance.After measurement parameter reaches predetermined value, first measurement electrode alternately can be coupled with the first electromotive force and the second electromotive force by the first resistance of the second divider, and the second measurement electrode alternately can be coupled with the first electromotive force and the second electromotive force by the second resistance of the second divider on the contrary with the first measurement electrode.The resistance of the second divider numerical value preferably on be greater than the resistance of the first divider.
Particularly advantageously verified, circuit arrangement comprises the switching device for converting the sense of current.Reach with this approach, need not much spend to convert the sense of current by measurement electrode.Switching device can such as be changed between the first on off state and second switch state, in the first on off state, first measurement electrode is coupled with the first electromotive force and the second measurement electrode is coupled with the second electromotive force by switching device, in second switch state, the first measurement electrode is coupled with the second electromotive force and the second measurement electrode is coupled with the first electromotive force by switching device.In the first on off state of switching device, produce the electric current on a described direction thus, in the second switch state of switching device, electric current flows to another direction.
About switching device, two kinds of different embodiments are set in principle:
Circuit arrangement can have microcontroller, and switching device can be integrated in microcontroller.If switching device is not integrated in microcontroller, then they must be set to external switch device.Now can use standardized component-i.e. microcontroller, and transistor and the analog of component that is additional, that be separated with microcontroller-namely separate need not be used.Circuit arrangement totally needs the considerably less component of quantity thus and can correspondingly form compactly; Especially, of great value installing space in home appliances can also be saved thus.
In an alternate embodiments, switching device is the switching device separated with the microcontroller of circuit arrangement.This switching device such as can have electric switch here, especially transistor.Preferred use bipolar transistor.This switching device such as can comprise following electric switch:
-the first switch, by the first switch, the first measurement electrode can be coupled with the first electromotive force by the first resistance of the first divider, and/or
-second switch, by second switch, the first measurement electrode can be coupled with the second electromotive force especially reference potential by the first resistance of the first divider, and/or
-three switch, by the 3rd switch, the second measurement electrode can be coupled with the first electromotive force by the second resistance of the first divider, and/or
-four switch, by the 4th switch, the second measurement electrode can be coupled with the second electromotive force by the second resistance of the first divider, and/or
-five switch, by the 5th switch, the first measurement electrode can be coupled with the first electromotive force by the first resistance of the second divider, and/or
-six switch, by the 6th switch, the first measurement electrode can be coupled with the second electromotive force by the first resistance of the second divider, and/or
-seven switch, by the 7th switch, the second measurement electrode can be coupled with the first electromotive force by the second resistance of the second divider, and/or
-eight switch, by the 8th switch, the second measurement electrode can be coupled with the second electromotive force by the second resistance of the second divider.
Use independent switching device to have advantage, namely do not need powerful microcontroller; Circuit arrangement uses simple microcontroller, and this microcontroller only must provide digital controlled signal with gauge tap device.
The microcontroller arranged in the scope of preferred configuration of the present invention is first for measuring method according to the invention process.
The measurement result like this obtained is for the further application in the method for dry washing material, and this microcontroller also can be implemented the control of the miscellaneous part of home appliances if desired and therefore oneself use these measured values; Can imagine equally, this microcontroller only for run circuit arrangement and implement described measuring method, the measurement result obtained is derived to another microcontroller, this another microcontroller be responsible for applying described measurement result to control until dry run.This can realize particularly by corresponding digital interface.
Two measurement electrode can be arranged in the cleaning-drum of such as home appliances, and this cleaning-drum constructs for holding washings.In principle, one in measurement electrode can be formed by cleaning-drum itself.But the electric current in order to ensure symmetry passes through measurement electrode, two measurement electrode are preferably the independent component separated with cleaning-drum.Measurement electrode is preferably so arranged on cleaning-drum, makes measurement electrode and cleaning-drum electrically insulated from one another.
Cleaning-drum in home appliances in principle with safety lead (namely for security, the electric lead of electrical network) electrical short is connected.This is electrically coupled the bearing that can be such as rotatably supported on it by cylinder and produces.If cleaning-drum and safety lead are electrically coupled, then can arrange in this embodiment, the cleaning-drum of home appliances is by pre-add one electromotive force, and this electromotive force is numerically between the first electromotive force and the second electromotive force.Prevent by this way, asymmetric discharge current (hereafter also referred to as " body electric current ") flows out to the earth by cleaning-drum and safety lead.Thus, the measurement of safety lead to washings voltage does not have negative effect.This electromotive force can equal the mean value of the first electromotive force and the second electromotive force.
In addition, according to the invention provides a kind of method determining measurement parameter relevant to washings aridity in home appliances, namely by measurement mechanism.Washings is dried in home appliances.Produce the electric current by two measurement electrode of arranging with being spaced from each other.The washings voltage declined between two measurement electrode is sensed, and tries to achieve measurement parameter according to the washings voltage of sensing.Converted repeatedly by the sense of current of measurement electrode.
Correspondingly be applicable to the inventive method about the preferred embodiment of home appliances introduction of the present invention and advantage thereof, vice versa.
Other features of the present invention are provided by the following description of Patent right requirement, accompanying drawing and these accompanying drawings.All characteristic sum Feature Combinations of mentioning in aforementioned explanation and following, that mention in the description of the drawings and/or the characteristic sum Feature Combination that illustrates separately are in the accompanying drawings not only in the combination indicated separately, and other combinations within the scope of this invention or can apply individually.
Accompanying drawing explanation
Now by each preferred embodiment, also with reference to accompanying drawing, illustrate the present invention in more detail.Accompanying drawing illustrates:
Fig. 1 according to the home appliances of the first embodiment schematically and the view of high abstraction; With
Fig. 2 according to the home appliances of the second embodiment schematically and the view of high abstraction.
In the accompanying drawings, the identical element identical with function represents with identical Reference numeral respectively.
Detailed description of the invention
In an embodiment, the home appliances 1 shown in Fig. 1 is dryer for washings.Home appliances 1 comprises cleaning-drum 2, and washings 3 is accommodated in this cleaning-drum 2.Washings 3 is dried in home appliances 1.Cleaning-drum 2 can such as flatly be bearing in home appliances 1, and namely it can rotate around the rotation of level.Cleaning-drum 2 can be electrically coupled with safety lead PE.
Washings 3 has Ohmic resistance, and this Ohmic resistance is schematically signified by element 4 in FIG.That is, washings resistance 4 is not the component of circuit, but the resistance of washings 3.Wet washings 3 has little resistance 4, and there is such relation: washings 3 is drier, and washings resistance 4 is larger.Washings resistance 4 is inversely proportional to the conducting value of washings 3.
Now interested is determine washings resistance 4, and it is the tolerance of the aridity of washings 3.For this purpose, provide measurement mechanism 5 in home appliances 1, this measurement mechanism 5 has two measurement electrode, i.e. the first measurement electrode 6 and the second measurement electrode 7.Measurement electrode 6,7 are arranged on cleaning-drum 2, and namely mode is, make their electrically insulated from one another.Measurement electrode 6,7 arrange spaced reciprocally, such as, be arranged on two of cleaning-drum 2 side opposite each other.Measurement electrode 6,7 such as can be arranged in cleaning-drum 2 circumferentially along the diameter of cleaning-drum 2.In home appliances 1 runs, measurement electrode 6,7 contact washings 3, thus washings resistance 4 is coupled to measurement electrode 6, on 7.Can say, washings resistance 4 is connected electrically in measurement electrode 6, between 7.
Measurement electrode 6,7 and circuit arrangement 8 are electrically coupled, and this circuit arrangement 8 for determining washings resistance 4, and determines the aridity of washings 3 thus.Circuit arrangement 8 comprises the microcontroller 9 as control device.Circuit arrangement 8 also comprises circuit node 10, and this circuit node 10 provides positive potential V
1.Electromotive force V
1can be such as 5V.The direct current electric pressure of 5V is produced thus, relative to reference potential 11(ground wire) on circuit node 10.
In the scope of current explaination, the measuring method of microcontroller 9 first for describing below performing in circuit arrangement 8.About the further application of measurement result in the method for dry washing material 3, microcontroller 9 also can perform the control of other building blocks to home appliances 1, and itself uses these measured values thus; It is contemplated that equally, the measurement result obtained only for running circuit arrangement 8 and performing this measuring method, derives to another not shown microcontroller by microcontroller 9, and this another microcontroller is responsible for application measurement result to control real dry run.This can realize particularly by corresponding digital interface.
Circuit arrangement 8 comprises the first divider 12, first divider 12 and has two Ohmic resistances, i.e. the first resistance 13 and the second resistance 14.First measurement electrode 6 is coupled with node 15 by the first resistance 13, and node 15 alternately provides electromotive force V
1with reference potential 11.And the second measurement electrode 7 is coupled with node 16 by the second resistance 14, node 16 equally alternately provides electromotive force V
1with reference potential 11, wherein beat anti-with node 15.
Circuit arrangement 8 also comprises the second divider 17, second divider 17 and has two Ohmic resistances equally: the first resistance 18 and the second resistance 19.First measurement electrode 6 is coupled with node 20 by the first resistance 18 of the second divider 17.Can alternately provide electromotive force V on node 20
1with reference potential 11.Correspondingly, the second measurement electrode 7 is coupled with node 21 by the second resistance 19 of the second divider 17.Node 21 also can alternately provide electromotive force V
1with reference potential 11, wherein beat anti-with node 20.
Thus, for the first divider 12, obtain by resistance 13,14 and washings resistance 4 form series circuit.If sense now in measurement electrode 6, the washings voltage U w declined between 7, then can obtain washings resistance 4, and can determine the aridity of washings 3.Similarly, for the second divider 17, obtain by resistance 18,19 and washings resistance 4 form series circuit.
Circuit arrangement 8 also comprises some switching devices 22, by them, node 15,16,20 and 21 can with electromotive force V
1or reference potential 11 is electrically connected.The emitter stage that switching device 22 comprises NPN bipolar transistor the 23, an one NPN bipolar transistor 23 is connected with node 15, and the colelctor electrode of a NPN bipolar transistor 23 is connected with circuit node 10.The base stage of bipolar transistor 23 is coupled with microcontroller 9.Node 15 can be coupled with reference potential 11 by the 2nd NPN bipolar transistor 24: the colelctor electrode of the second bipolar transistor 24 is connected with node 15, and emitter stage is connected with reference potential 11.Base stage is also coupled with microcontroller 9.The colelctor electrode that switching device 22 also comprises the 3rd NPN bipolar transistor the 25, three NPN bipolar transistor 25 is connected with circuit node 10 and the emitter stage of the 3rd NPN bipolar transistor 25 is connected with node 16.The base stage of the 3rd bipolar transistor 25 is also coupled with microcontroller 9.Node 16 can be coupled with reference potential 11 by the 4th NPN bipolar transistor 26; The emitter stage of the 4th NPN bipolar transistor 26 is connected with reference potential 11, and the colelctor electrode of the 4th NPN bipolar transistor 26 is connected with circuit node 16.
Switching device 22 also comprises the 5th NPN bipolar transistor 27, and node 20 can be coupled with circuit node 10 by the 5th NPN bipolar transistor.The emitter stage of bipolar transistor 27 is connected with node 20, and the colelctor electrode of bipolar transistor 27 is connected with circuit node 10.The base stage of bipolar transistor 27 is coupled with microcontroller 9.Node 20 can be coupled with reference potential 11 by the 6th NPN bipolar transistor 28.The emitter stage of bipolar transistor 28 is connected with reference potential 11, and its colelctor electrode is connected with node 20.The base stage of bipolar transistor 28 is coupled with microcontroller 9.Node 21 can be electrically coupled with circuit node 10 by the 7th NPN bipolar transistor 29.Bipolar transistor 29 to be connected with circuit node 10 with its colelctor electrode equally and to be connected with node 21 with its emitter stage 21.The base stage of bipolar transistor 29 is coupled with microcontroller 9.Finally, node 21 can be coupled with reference potential 11 by the 8th NPN bipolar transistor 30.The colelctor electrode of bipolar transistor 30 is connected with node 21, and the emitter stage of bipolar transistor 30 is connected with reference potential 11.
Bipolar transistor 23 to 30 is controlled by microcontroller 9.
As explained, microcontroller 9 can sense the voltage U w declined on washings 3.For this purpose, the first measurement electrode 6 is coupled with the measurement input 32 of microcontroller 9 by ohm measuring resistance 31.Correspondingly, the second measurement electrode 7 is measured input 34 by another ohm of measuring resistance 33 with second of microcontroller 9 and is coupled.Node 35 between measuring resistance 31 and the first measurement electrode 6 is coupled with reference potential 11 by capacitor 36.In addition, the node 37 measured between input 32 at measuring resistance 31 and first is coupled with reference potential 11 by capacitor 38.Correspondingly, the node 39 between the second measurement electrode 7 and measuring resistance 33 is coupled with reference potential 11 by capacitor 40; Be coupled with reference potential 11 by capacitor 42 at measuring resistance 33 and the second node 41 measured between input 34.Microcontroller 9 measurements are applied to the voltage on capacitor 38 and 42 and instead can release washings voltage U w thus.More precisely, microcontroller 9 senses the electromotive force be applied on node 37 and 41, and the difference of described electromotive force is measuring of washings voltage U w.In the hope of washings resistance 4, and the aridity of washings 3 can be also tried to achieve thus again, such as, by the form stored according to washings voltage U w.
In addition, in circuit arrangement 8, also provide protection element, form is NPN bipolar transistor 43 to 46.At this, the task of bipolar transistor 43 to 46 is, restriction appears at measurement electrode 6, the electromotive force on 7.The respective base stage of bipolar transistor 43 to 46 is connected with respective emitter stage electrical short.The colelctor electrode of bipolar transistor 43 is connected with circuit node 10, and circuit node 10 provides electromotive force V
1.The emitter stage of bipolar transistor 43 is connected with node 35.Node 35 is also connected with the colelctor electrode of bipolar transistor 44, and the emitter stage of this bipolar transistor 44 is connected with reference potential 11.Similarly, symmetrically, node 39 is with the emitter stage of bipolar transistor 45 and be connected with the colelctor electrode of bipolar transistor 46.The colelctor electrode of bipolar transistor 45 is connected with circuit node 10, and the emitter stage of bipolar transistor 46 is connected with reference potential 11.
Explain now that measurement mechanism 5 is in the operating working method of home appliances 1 in more detail: in home appliances 1 runs, microcontroller 9 is known washings resistance 4 and is known the aridity of washings 3 thus, can calculate thus until time needed for normal termination dry run.Namely just dry run is terminated when washings 3 is dry.
Be wet or when washings resistance 4 is little, bipolar transistor 23 to 26 is controlled like this by microcontroller 26 at washings 3, make alternately to apply positive potential V on node 15
1with reference potential 11, and always alternately apply the electromotive force V different from node 15 on node 16
1or electromotive force 11.This reversal is such as carried out with the frequency of 400Hz.Therefore, a DC current I flows through measurement electrode 6, and 7 and also flow through washings 3 thus, the direction of this DC current I converts continuously.This direction transformation is due to electromotive force V
1realize with 11 periodic transformation's polarity on node 15 and 16.Can say, electric current I is symmetrical rectangular current.
Flowing through measurement electrode 6, when the electric current I of 7 is changed direction constantly, microcontroller 9 senses the amplitude of washings voltage U w, wherein at measurement input 32, senses on 34.Flow in which direction depending on electric current I, the amplitude of washings voltage U w may slightly change.The plating effect that this slight change of amplitude may still can exist owing to cleaning-drum 2 inside.But, microcontroller 9 both for the amplitude of a sensing direction washings voltage U w of electric current I, also for the amplitude of another sensing direction washings voltage U w of electric current I.Microcontroller 9 can be averaging these amplitudes and mean value based on these amplitudes determines washings resistance 4.Realized by this approach, the polarizing voltage that may also exist does not affect completely on precision when determining washings resistance 4.Therefore, being measured by this difference can with the aridity of high precision determination washings 3.
When wet washings 3, only the first divider 12 is flowed through by electric current, and bipolar transistor 27 to 30 is not controlled, therefore the second divider 17 no power.That second divider 17 and the first divider are in a ratio of high ohm and there is higher all-in resistance.The all-in resistance of the first divider 12 can be such as 100K Ω, and the all-in resistance of the second divider 17 can be 1.2M Ω.This means, the resistance 13,14 of the first divider 12 can have the resistance value of 50K Ω respectively, and the resistance 18,19 of the second divider 17 can have the resistance value of 600K Ω respectively.
During dry run, washings 3 is more and more drier, and washings resistance 4 raises.The amplitude of washings voltage U w also raises.If only use the first divider 12 for whole dry run now, then microcontroller 9 must measure the amplitude of washings voltage U w in relatively large measurement category.In order to avoid this situation, from a determined value of washings voltage U w mono-determined value or washings resistance 4, do not re-use the first divider 12, replace use second divider 17.If namely the amplitude of washings voltage U w reaches predetermined value, then no longer control bipolar transistor 23 to 26, replace and control bipolar transistor 27 to 30.The control of bipolar transistor 27 to 30 is carried out similarly: node 20 is alternately loaded with described frequency with electromotive force V
1with reference potential 11, node 21 is always loaded with another electromotive force V
1or electromotive force 11.Then make the high-ohmic resistance 18,19 of measurement electrode 6,7 and the second divider 17 connect, thus in measurement electrode 6, the dividing potential drop declined between 7 also reduce.Microcontroller 9 with better resolution measurement washings voltage U w, almost can experience the measurement category of microcontroller 9 for twice thus.
Washings resistance 4 by bipolar ground and measure symmetrically.Circuit arrangement 8 electricity constructs symmetrically, thus avoids the plating effect of cleaning-drum 2 inside.
As explained, cleaning-drum 2 is electrically coupled with safety lead PE in principle, wherein such as passes through bearing.In order to avoid discharge current flows to the earth by cleaning-drum 2 and safety lead PE, in this embodiment, cleaning-drum 2 or the pre-making alive of safety lead PE, relative to reference potential 11.Such as, cleaning-drum 2 can be loaded one numerically than electromotive force V
1electromotive force half as large.Can provide divider 47, this divider 47 intercepts electromotive force V on circuit node 10 for this reason
1and by resistance 48,49 carry out dividing potential drop.Cleaning-drum 2 or safety lead PE by resistance 50 and can be positioned at resistance 48, and the node 51 between 49 is coupled.Resistance 48,49 and 50 can have the resistance value of 10K Ω respectively.
The element of circuit arrangement 8 can such as following value:
-resistance 13,14: each 50K Ω;
-resistance 18,19: each 600K Ω;
-capacitor 36,40: each 10pF(also can save);
-capacitor 38,42: each 100pF;
-resistance 31,33: each 4.7K Ω.
Home appliances 1 according to another embodiment of the present invention shown in Figure 2.The working method of measurement mechanism 5 is as in the case of the embodiment according to fig. 2 substantially with identical in the embodiment in accordance with fig. 1.The structure of measurement mechanism 5 is also similar, thus only elaborates difference below.
Circuit arrangement 8 comprises microcontroller 9' here, and switching device (in Fig. 1 22) is integrated in this microcontroller 9 '.Microcontroller 9' has four joints now, and namely the first joint 52(is corresponding to the node 15 in Fig. 1), the second joint 53(is corresponding to the node 16 in Fig. 1), the 3rd joint 54(is corresponding to the node 20 in Fig. 1) and the 4th joint 55(corresponding to the node 21 in Fig. 1).First joint 52 is coupled with the first measurement electrode 6 by the first resistance 13 of the first divider 12, and the second joint 53 is coupled with the second measurement electrode 7 by the second resistance 14 of the first divider 12.Correspondingly, the 3rd joint 54 is coupled with the first measurement electrode 6 by the first resistance 18 of the second divider 17, and the 4th joint 55 is coupled with the second measurement electrode 7 by the second resistance 19 of the second divider 17.Microcontroller 9' also with circuit node 10(electromotive force V
1) connect.
Correspondingly, the function of capacitor 38 and 42 is born by capacitor 38a and 38b or 42a and 42b now.These capacitors are connected to corresponding joint 52,54, between 53,55 and reference potential 11.
In the scope of current explanation, microcontroller 9' in circuit arrangement 8 also first for performing following measuring method to be described.The further application of the measurement result like this obtained in the method for dry washing material 3, microcontroller 9' also can add the control of the miscellaneous part performing home appliances 1 and self use measured value thus; Can imagine equally, microcontroller 9' is isolated operation circuit arrangement 8 and execution measuring method only, the measurement result obtained is derived to another microcontroller unshowned in the drawings, and this another controller is responsible for using measurement result to control real dry run.This can realize particularly by corresponding digital interface.
When washings 3 is wet (in the first measurement category, before washings voltage U w reaches predetermined value), microcontroller 9' alternately provides electromotive force V on the first joint 52
1with reference potential 11.And the electromotive force different from first interface 52 is always to provide on the second joint 53.
Before washings voltage U w reaches predetermined value, the third and fourth joint 54,55 is used as to measure input (with reference to 32,34 in Fig. 1).Washings voltage U w is measured by these joints 54,55.
If washings voltage U w reaches predetermined value or washings resistance 4 raises, then electromotive force V
1or electromotive force 11 no longer at joint 52, provides on 53, but at joint 54, provide on 55.Present joint 52,53 is used as measuring input, at joint 52, measures washings voltage U w on 53.
Therefore, be also bipolar ground as in the case of the embodiment according to fig. 2 and measure washings resistance 4 symmetrically.In microcontroller 9 ', provide four joints 52 to 55, described four joints are used as input or output in couples depending on the measurement category of washings voltage U w.
Reference numerals list
1 home appliances
2 cleaning-drums
3 washings
4 washings resistance
5 measurement mechanisms
6 measurement electrode
7 measurement electrode
8 circuit arrangements
9 microcontrollers
9' microcontroller
10 circuit nodes
11 reference potentials
12 divider
13 resistance
14 resistance
15 nodes
16 nodes
17 divider
18 resistance
19 resistance
20 nodes
21 nodes
22 switching devices
23 NPN bipolar transistors
24 NPN bipolar transistors
25 NPN bipolar transistors
26 NPN bipolar transistors
27 NPN bipolar transistors
28 NPN bipolar transistors
29 NPN bipolar transistors
30 NPN bipolar transistors
31 measuring resistances
32 measure input
33 measuring resistances
34 measure input
35 nodes
36 capacitors
37 nodes
38,38a, 38b capacitor
39 nodes
40 capacitors
41 nodes
42,42a, 42b capacitor
43 NPN bipolar transistors
44 NPN bipolar transistors
45 NPN bipolar transistors
46 NPN bipolar transistors
47 divider
48 resistance
49 resistance
50 resistance
51 nodes
52 joints
53 joints
54 joints
55 joints
I electric current
PE safety lead
Uw washings voltage
V
1electromotive force
Claims (14)
1. for the home appliances (1) of dry washing material (3), have measurement mechanism (5), this measurement mechanism is used for determining measurement parameter (4, the U relevant to the aridity of washings (3)
w), wherein, this measurement mechanism (5) comprising:
-two measurement electrode (6 of arranging that are spaced from each other, 7), these measurement electrode (6,7) so arrange in home appliances (1), make these measurement electrode (6,7) in home appliances (1) runs, washings (3) to be dried is contacted, and
-one and described measurement electrode (6,7) circuit arrangement (8) be coupled, this circuit arrangement (8) constructs for generation of flowing through measurement electrode (6,7) electric current (I), sense between measurement electrode (6,7) decline washings voltage (U
w) and according to the washings voltage (U sensed
w) draw and measure parameter (4, U
w),
It is characterized in that, described circuit arrangement (8) constructs converted repeatedly by the sense of current of measurement electrode (6,7) for making.
2. home appliances according to claim 1 (1), it is characterized in that, described circuit arrangement (8) constructs for alternately in described measurement electrode (6,7) applying one electromotive force is gone up and the electromotive force that applying one is different in another measurement electrode (6,7) of correspondence for one in.
3. according to the home appliances (1) of claim 1 or 2, it is characterized in that, described circuit arrangement (8) constructs for making the direction of electric current (I) with a frequency transformation, and this frequency is in from 300Hz to 500Hz codomain.
4. according to the home appliances (1) of claim 1 or 2, it is characterized in that, described circuit arrangement (8) constructs to obtain the washings voltage (U that produces for the direction be both pursuant to for electric current (I)
w), be also pursuant to the washings voltage (U that the other direction for electric current (I) produces
w) obtain described measurement parameter (4, U
w).
5. according to the home appliances (1) of claim 1 or 2, it is characterized in that, described circuit arrangement (8) has a divider (12), what this divider (12) comprised washings (3) is coupled to measurement electrode (6,7) the washings resistance (4) on, and this circuit arrangement (8) constructs for generation of the electric current (I) flowing through this divider (12).
6. home appliances according to claim 5 (1), it is characterized in that, described divider (12) has the first Ohmic resistance (13) and the second Ohmic resistance (14), the first measurement electrode (6) by this first Ohmic resistance (13) alternately can with the first electromotive force (V
1) and be different from the first electromotive force (V
1) the second electromotive force (11) coupling, the second measurement electrode (7) by this second Ohmic resistance (14) and the first measurement electrode (6) on the contrary alternately can with described first and second electromotive force (V
1, 11) and coupling.
7. home appliances according to claim 6 (1), is characterized in that, described first electromotive force (V
1) be positive potential, described second electromotive force (11) is positive potential little compared with described first electromotive force (11) or is reference potential (11).
8. home appliances according to claim 5 (1), it is characterized in that, described circuit arrangement (8) has one second divider (17), this second divider (17) has all-in resistance numerically larger compared with the first divider (12), and this circuit arrangement (8) constructs at described measurement parameter (4, U
w) reach predetermined value after get around the first divider (12) and produce described electric current (I) by the second divider (17).
9. home appliances according to claim 8 (1), it is characterized in that, described second divider (17) has the first Ohmic resistance (18) and the second Ohmic resistance (19), and at described measurement parameter (4, U
w) reach the first measurement electrode (6) after predetermined value by first resistance (18) of the second divider (17) alternately can with the first electromotive force (V
1) and the second electromotive force (11) coupling, and the second measurement electrode (7) and the first measurement electrode (6) on the contrary by second resistance (19) of the second divider (17) alternately can with the first electromotive force (V
1) and the second electromotive force (11) coupling.
10. according to the home appliances (1) of claim 1 or 2, it is characterized in that, described circuit arrangement (8) has the switching device (22) in the direction for converting described electric current (I).
11. home appliances according to claim 10 (1), is characterized in that, described circuit arrangement (8) has microcontroller and described switching device (22) is integrated in this microcontroller.
12. home appliances according to claim 10 (1), is characterized in that, described switching device (22) is the switching device (22) separated with the microcontroller of described circuit arrangement (8).
13. home appliances according to claim 1 and 2 (1), is characterized in that, the first measurement electrode (6) in described measurement electrode alternately can with the first electromotive force (V
1) and be different from the first electromotive force (V
1) the second electromotive force (11) coupling, the second measurement electrode (7) and the first measurement electrode (6) on the contrary alternately can with described first and second electromotive force (11, V
1) coupling, wherein, the cleaning-drum (2) of this home appliances (1) can be loaded an electromotive force, and this electromotive force is numerically in described first and second electromotive force (11, V
1) between.
14. for determining measurement parameter (4, the U relevant to washings (3) aridity by measurement mechanism (5) in home appliances (1)
w) method, washings (3) is dried in this home appliances (1), and the method has following steps:
-produce by two spaced measurement electrode (6 of arranging of turning up the soil, 7) electric current (I), described measurement electrode (6,7) so arrange in this home appliances (1), make described measurement electrode (6,7) washings (3) to be dried is contacted
-sense the washings voltage (U declined between these two measurement electrode (6,7)
w), and
-according to the washings voltage (U sensed
w) draw described measurement parameter (4, U
w),
It is characterized in that, the direction of the described electric current (I) by described measurement electrode (6,7) is converted repeatedly.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010038890A DE102010038890A1 (en) | 2010-08-04 | 2010-08-04 | Domestic appliance for drying items of laundry and method for determining a measured quantity correlated with a degree of drying of the items of laundry |
| DE102010038890.4 | 2010-08-04 | ||
| PCT/EP2011/062346 WO2012016820A2 (en) | 2010-08-04 | 2011-07-19 | Household appliance for drying laundry items and method for determining a measurement variable correlated to a level of dryness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103052745A CN103052745A (en) | 2013-04-17 |
| CN103052745B true CN103052745B (en) | 2015-01-21 |
Family
ID=44512833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180038226.5A Active CN103052745B (en) | 2010-08-04 | 2011-07-19 | Household appliance for drying laundry items and method for determining a measurement variable correlated to a level of dryness |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2601339B1 (en) |
| CN (1) | CN103052745B (en) |
| DE (1) | DE102010038890A1 (en) |
| EA (1) | EA023640B1 (en) |
| PL (1) | PL2601339T3 (en) |
| WO (1) | WO2012016820A2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012220687A1 (en) | 2012-11-13 | 2014-05-15 | BSH Bosch und Siemens Hausgeräte GmbH | Method for determining at least one characteristic of items of laundry, and corresponding laundry care machine |
| DE102012223438A1 (en) | 2012-12-17 | 2014-06-18 | BSH Bosch und Siemens Hausgeräte GmbH | Household appliance i.e. laundry dryer, for drying laundries, has control device applying measuring electrodes with voltages via respective different voltage dividers for detecting variable in respective different measuring value ranges |
| PL3162952T3 (en) | 2015-10-26 | 2019-09-30 | Electrolux Appliances Aktiebolag | Laundry drying appliance with capacitive laundry drying degree sensing function |
| TR201610981A2 (en) * | 2016-08-05 | 2018-02-21 | Arcelik As | Electrical household appliance having a moisture sensing circuit |
| AU2016434981B2 (en) | 2016-12-28 | 2023-07-13 | Electrolux Appliances Aktiebolag | Laundry appliance comprising a humidity sensor |
| KR20190096353A (en) | 2016-12-28 | 2019-08-19 | 일렉트로룩스 어플라이언스 아크티에볼레그 | Instrument using reliable information of drying cycle |
| AU2018412044A1 (en) | 2018-03-07 | 2020-08-20 | Electrolux Appliances Aktiebolag | Appliance with capacitive humidity sensor |
| DE102020203522A1 (en) | 2020-03-19 | 2021-09-23 | BSH Hausgeräte GmbH | Household PEF Cooking Apparatus and Method of Operating the Same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2200019A1 (en) * | 1972-01-03 | 1973-07-26 | Licentia Gmbh | HUMIDITY CONTROLS FOR A DRYER |
| EP1087053A2 (en) * | 1999-09-23 | 2001-03-28 | Diehl AKO Stiftung & Co. KG | Electronic device for determining the drying degree of the laundry in a laundry drier |
| EP0942094B1 (en) * | 1998-03-13 | 2002-09-04 | BSH Bosch und Siemens Hausgeräte GmbH | Method for determining the moisture content of textile articles in a laundry drier |
| CN1696390A (en) * | 2004-05-13 | 2005-11-16 | Lg电子株式会社 | Control method of clothes dryer and apparatus thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE792234A (en) * | 1971-12-03 | 1973-03-30 | Liggett & Myers Inc | METHODS AND APPARATUS FOR DETERMINING THE HUMIDITY CONTENT OF TOBACCO |
| DE3929155A1 (en) * | 1989-09-02 | 1991-03-14 | Reemtsma H F & Ph | METHOD AND DEVICE FOR DETERMINING THE FILLABILITY OF TOBACCO AND THE HARDNESS OF CIGARETTES |
| US5578753A (en) * | 1995-05-23 | 1996-11-26 | Micro Weiss Electronics, Inc. | Humidity and/or temperature control device |
| DE19717711A1 (en) * | 1997-04-18 | 1998-10-22 | Umsicht Inst Fuer Umwelt Siche | Measuring cell and method for on-line moisture measurement for bulk goods |
-
2010
- 2010-08-04 DE DE102010038890A patent/DE102010038890A1/en not_active Withdrawn
-
2011
- 2011-07-19 WO PCT/EP2011/062346 patent/WO2012016820A2/en active Application Filing
- 2011-07-19 CN CN201180038226.5A patent/CN103052745B/en active Active
- 2011-07-19 EA EA201390104A patent/EA023640B1/en not_active IP Right Cessation
- 2011-07-19 PL PL11733864T patent/PL2601339T3/en unknown
- 2011-07-19 EP EP11733864.0A patent/EP2601339B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2200019A1 (en) * | 1972-01-03 | 1973-07-26 | Licentia Gmbh | HUMIDITY CONTROLS FOR A DRYER |
| EP0942094B1 (en) * | 1998-03-13 | 2002-09-04 | BSH Bosch und Siemens Hausgeräte GmbH | Method for determining the moisture content of textile articles in a laundry drier |
| EP1087053A2 (en) * | 1999-09-23 | 2001-03-28 | Diehl AKO Stiftung & Co. KG | Electronic device for determining the drying degree of the laundry in a laundry drier |
| CN1696390A (en) * | 2004-05-13 | 2005-11-16 | Lg电子株式会社 | Control method of clothes dryer and apparatus thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| PL2601339T3 (en) | 2014-10-31 |
| EP2601339A2 (en) | 2013-06-12 |
| EA023640B1 (en) | 2016-06-30 |
| WO2012016820A2 (en) | 2012-02-09 |
| EA201390104A1 (en) | 2013-07-30 |
| EP2601339B1 (en) | 2014-04-30 |
| WO2012016820A3 (en) | 2012-08-16 |
| CN103052745A (en) | 2013-04-17 |
| DE102010038890A1 (en) | 2012-02-09 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: BSH HOME APPLIANCES CO., LTD. Free format text: FORMER NAME: BOSCH UND SIEMENS HAUSGERATE GMBH |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Munich, Germany Patentee after: BSH Household Electrical Appliance Co., Ltd Address before: Munich, Germany Patentee before: BSH Bosch and Siemens Household Appliances Co., Ltd. |