CN103052745A - 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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- CN103052745A CN103052745A CN2011800382265A CN201180038226A CN103052745A CN 103052745 A CN103052745 A CN 103052745A CN 2011800382265 A CN2011800382265 A CN 2011800382265A CN 201180038226 A CN201180038226 A CN 201180038226A CN 103052745 A CN103052745 A CN 103052745A
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- washings
- measurement electrode
- electromotive force
- measurement
- divider
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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
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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
- D06F34/08—Control circuits or arrangements thereof
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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
- 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 for the measurement mechanism of determining the measurement parameter relevant with the washings aridity.This measurement mechanism comprises two measurement electrode of arranging at each interval, and these two measurement electrode are so arranged in the family expenses utensil, so that measurement electrode is at the contact in service washings to be dried of family expenses utensil.Measurement mechanism also comprises the circuit arrangement with the measurement electrode coupling.Circuit arrangement can cause the electric current by measurement electrode, the washings voltage that sensing descends between measurement electrode and draw the measurement parameter according to the washings voltage of sensing.The invention still further relates to a kind of method for determine the measurement parameter relevant with the washings aridity at the family expenses utensil by measurement mechanism, washings is dried in this home appliances.
Background technology
The aridity of knowing the washings in dryer for washings or the scrubbing-and-drying unit is prior art.If washings then can finish dry run by this way with dry according to the rules.Current interest especially is to measure conduction value or the Ohmic resistance of washings.Then can instead release the aridity of washings by the conduction value; The conduction value is the tolerance of aridity.Apply to the following relationship: the conduction value of washings resistance less or washings is larger, and washings is drier.
The conduction value of washings can for example draw by DC current, and DC current is owing to being applied to DC voltage on the electrode washings of flowing through.In this shortcoming be, DC current can force to cause chemical reaction, and effect may occur electroplating.Form the polarizing voltage relevant with the washings aridity owing to electroplating effect.This polarizing voltage makes the measured value distortion of the resistance of washings usually.Can realize remedying in this a kind of method of describing in such as document EP 0942094B1.Determine in the method the polarizing voltage between measurement electrode and the washings, and when determining the conduction value of washings, consider this polarizing voltage.Deduct polarizing voltage from washings voltage.In the prior art, in definite conduction value with determine between the polarizing voltage must be through one period ineffective time, by the current interruptions of washings or at least strongly reduce, this situation is considered again shortcoming during this ineffective time.Can reach 10 seconds this ineffective time.Thus, can not determine fast aridity or definite at that time instantaneous aridity of washings.
Summary of the invention
Task of the present invention is, a kind of approach is provided, and how can draw the at that time instantaneous aridity of washings in the home appliances of the described type of beginning, and the result is not because of the polarizing voltage distortion.
A kind of home appliances and a kind of method of this task feature by having respectively corresponding independent claims according to the present invention solve.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 used for determining the measurement parameter relevant with the washings aridity.Measurement mechanism comprises two measurement electrode of arranging at each interval.Measurement electrode can be at the contact in service of family expenses utensil washings to be dried.Measurement mechanism also comprises the circuit arrangement with the measurement electrode coupling.Circuit arrangement is constructed to such an extent that be used for to produce electric current by measurement electrode, the washings voltage that sensing descends between measurement electrode and draw the measurement parameter according to the washings voltage of sensing.Circuit arrangement is so constructed so that in service at the family expenses utensil, the sense of current that flows through measurement electrode repeatedly, especially periodically conversion.
Thus, realize a kind of effect according to the present invention, that is, unlike the prior art, be conducted through the alternating current that can be described as of measurement electrode, rather than DC current.It is repeatedly conversion of the sense of current.Reach by this way high accuracy ground and determine to measure parameter, measure the measurement of parameter not because electroplating the effect distortion.I.e. conversion by the sense of current prevents from forming polarizing voltage between washings and measurement electrode.Thus, from different in the content of document EP 0942094B1, needn't try to achieve polarizing voltage and measure parameter no longer needs to proofread and correct.Compare with the prior art, must not wait now by the time go over ineffective time, but can draw rapidly the measurement parameter.Can determine thus to measure the at that time instantaneous value of parameter.
Draw the measurement parameter relevant with the washings aridity by measurement mechanism.For example can determine that ohm resistance of the conduction value of aridity itself (perhaps being percentage) and/or washings and/or washings is as measuring parameter.But addedly or alternatively, also can regard the washings voltage that descends at washings as the measurement parameter.
The conversion of the sense of current by measurement electrode can realize with different forms and mode.For example can followingly realize: alternately in measurement electrode applies an electromotive force and applies an electromotive force different from this electromotive force in another measurement electrode of correspondence.This means, at the time point of determining, there is lower electromotive force in an electrode in these electrodes, and has higher electromotive force in another measurement electrode.These electromotive forces can be repeatedly with exchange each other, thus so that be applied to voltage reverse repeatedly correspondingly on the electrode.Can between measurement electrode, apply electric current rectangle, the periodically voltage of conversion, and generation rectangle, the periodicity conversion with minimum technology spending by this way.In addition, prevent between measurement electrode and washings, forming polarizing voltage by this measure.That is, in this embodiment bipolarlyly and electricity measurement parameter symmetrically, because the electromotive force that is applied on the measurement electrode exchanges or reverse repeatedly.
Such as explained, by the periodically conversion of sense of current of measurement electrode.For example can so construct circuit arrangement, so that the sense of current is with a frequency transformation, this frequency is in the codomain from 300Hz to 500Hz.This frequency can for example be 400Hz.Thus, the pulse length of potential pulse or current impulse is relatively short, thereby the plating effect on the measurement electrode is lowered to minimum.Can relatively quickly, namely in the millisecond scope, implement in addition the measurement of conduction value.
In circuit arrangement, especially draw described measurement parameter according to the washings voltage that when electric current is flowed through washings between two measurement electrode, descends.Arrange in one embodiment, put forward two different values quoting washings voltage for determine measuring parameter: being the washings voltage value that a direction for electric current produces on the one hand, is the washings voltage value that the other direction for electric current produces on the other hand.Namely in this embodiment, for the both direction sensing washings voltage of electric current, and be worth the measurement parameter according to two of washings voltage.Can also draw more accurately the measurement parameter by this way.Namely reach with this approach: the plating effect that may still occur totally is reduced to zero to determining the impact of measuring parameter.Ideally, the washings voltage of two senses of current numerically should equate.If determine now washings voltage that a direction at electric current produces and between the washings voltage that the other direction of electric current produces, have difference, then this be between measurement electrode, form parasitic elements because electroplating effect, such as the sign of stray voltage source.Thus, measure for determining parameter, can use washings voltage value that a direction at electric current produces and the mean value of the washings voltage value that produces at the other direction of electric current.Can draw the measurement parameter thus pin-point accuracy.
In one embodiment, circuit arrangement has divider, and this divider comprises the washings Ohmic resistance on the measurement electrode of being coupled to of washings.In this embodiment by the divider generation current.By the washings voltage that uses divider to descend at washings with cost and the high degree of accuracy sensing of minimum.
This divider can have the first Ohmic resistance and the second Ohmic resistance.By the first resistance, the first measurement electrode in the measurement electrode can alternately be coupled with the first electromotive force and the second electromotive force that is different from the first electromotive force.And by the second resistance, the second measurement electrode can alternately 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 differently is coupled with another electromotive force with the first measurement electrode.For a time point of determining, the first measurement electrode can be coupled with the first electromotive force thus, and the second measurement electrode and the coupling of the second electromotive force.And at next time point, the first measurement electrode and the coupling of the second electromotive force, the second measurement electrode and the coupling of the first electromotive force.Namely in this embodiment, the Ohmic resistance of washings is connected with the first and second resistance and voltage descends at this series circuit, and this voltage drop equals poor 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 equates for the both direction of electric current.Can prevent from electroplating thus just effect.
The first electromotive force is preferably positive potential.The first electromotive force can for example be in the codomain from 3V to 7V; It can for example be 5V.Preferably compare with the first electromotive force electromotive force of low positive potential or reference potential (ground connection), especially 0V of the second electromotive force.Thus, for producing the voltage of transformation of rectangle, only need a positive potential; This circuit arrangement need not negative potential-namely with respect to the negative potential of reference potential.Save thus and produce negative potential and associated shortcoming, i.e. attachment members and relative cost.
Circuit arrangement also can have second divider different from the first divider.The second divider can have with the first divider compares numerically larger all-in resistance.Circuit arrangement can so be constructed, so that reach that the predetermined value after-current is walked around the first divider, the resistance of namely walking around the first divider is conducted through the second divider measuring parameter.The second divider also can comprise the washings resistance of washings.Can totally realize measuring the larger measurement category of parameter by this measure mode.This embodiment is take such fact as the basis, that is, the Ohmic resistance of washings is increasing during dry run.The amplitude of the washings voltage of sensing also becomes large between measurement electrode thus.Reach the predetermined value after-current by the second divider conduction than the high ohm of the first divider if measure now parameter (for example washings resistance), the dividing potential drop that then intercepts in measurement electrode (washings voltage) reduces.Thus, the amplitude of washings voltage remains on one to be determined in the codomain, and can use for the microcontroller that calculates washings voltage, and microcontroller can be measured washings voltage in limited codomain.This embodiment has this advantage in addition: can have better resolution ratio and have thus very high degree of precision degree ground and measure the washings voltage that descends between measurement electrode.
The second divider can have two Ohmic resistances equally, i.e. the first resistance and the second resistance.After the measurement parameter reaches predetermined value, the first measurement electrode can alternately 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 can alternately 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 on numerical optimization greater than the resistance of the first divider.
Verified particularly advantageous be that circuit arrangement comprises the switching device for the conversion sense of current.Reach with this approach, need not much spend conversion by the sense of current of measurement electrode.Switching device can for example be changed between the first on off state and second switch state, in the first on off state, switching device is coupled with the coupling of the first measurement electrode and the first electromotive force and with the second measurement electrode and the second electromotive force, in the second switch state, switching device is coupled with the coupling of the first measurement electrode and the second electromotive force and with the second measurement electrode and the first electromotive force.Produce thus the electric current on the described direction in the first on off state of switching device, electric current flows to another direction in the second switch state of switching device.
About switching device, two kinds of different embodiments are set in principle:
Circuit arrangement can have microcontroller, and switching device can be integrated in the microcontroller.If switching device is not integrated in the microcontroller, then they must be set to the external switch device.This moment can Application standard member-be microcontroller, and needn't use transistor and the analog of member additional, that separate with microcontroller-namely separate.Circuit arrangement totally needs thus the considerably less member of quantity and can correspondingly consist of compactly; Especially, also can save thus of great value installing space in the home appliances.
In an alternate embodiments, switching device is the switching device that the microcontroller with circuit arrangement separates.This switching device can for example have electric switch, especially transistor here.The preferred bipolar transistor that uses.This switching device for example can comprise following electric switch:
The-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
-Di three switches, 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
-Di four switches, 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
-Di five switches, 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
-Di six switches, 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
-Di minion is closed, and closes by minion, and the second measurement electrode can be coupled with the first electromotive force by the second resistance of the second divider, and/or
-Di eight switches, 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 to get final product, and this microcontroller only must provide digital controlled signal with the gauge tap device.
The microcontroller that arranges in the scope of preferred configuration of the present invention at first is used for according to the described measuring method of the invention process.
The measurement result that like this obtains is in the further application of the method that is used for dry washing material, and this microcontroller also can be implemented in case of necessity the control of the miscellaneous part of home appliances and also therefore oneself use these measured values; Can imagine equally, this microcontroller only is used for the operation circuit arrangement and implements described measuring method, the measurement result that obtains is derived to another microcontroller, this another microcontroller be responsible for using described measurement result is controlled until dry run.This can especially realize by corresponding digital interface.
Two measurement electrode can be arranged in the cleaning-drum of home appliances for example, and this cleaning-drum is constructed to such an extent that be used for holding washings.In principle, in the measurement electrode can be formed by cleaning-drum itself.Yet, pass through measurement electrode in order to ensure the electric current of symmetry, two measurement electrode are preferably the independent member that separates with cleaning-drum.Measurement electrode preferably so is installed on the cleaning-drum, so that measurement electrode and cleaning-drum electrically insulated from one another.
Cleaning-drum in the home appliances is connected with safety lead (namely being used for electric lead security, electrical network) electrical short in principle.The bearing that this electric coupling can for example be rotatably supported on it by cylinder produces.If cleaning-drum and safety lead electric coupling then can arrange in this embodiment, the cleaning-drum of home appliances is added an electromotive force in advance, and this electromotive force numerically is between the first electromotive force and the second electromotive force.Prevent by this way, asymmetric discharge current (hereinafter being also referred to as " body electric current ") flows out to the earth by cleaning-drum and safety lead.Thus, safety lead does not have negative effect to the measurement of washings voltage.This electromotive force can equal the mean value of the first electromotive force and the second electromotive force.
In addition, according to the method that the invention provides measurement parameter relevant with the washings aridity in a kind of definite home appliances, namely by measurement mechanism.Washings is dried in the family expenses utensil.Generation by the electric current of two measurement electrode of arranging with being spaced from each other.The washings voltage that descends between two measurement electrode is sensed, and tries to achieve the measurement parameter according to the washings voltage of sensing.Sense of current by measurement electrode is by repeatedly conversion.
Preferred embodiment and advantage thereof about home appliances introduction of the present invention correspondingly are applicable to the inventive method, and vice versa.
Other features of the present invention are provided by the following description of Patent right requirement, accompanying drawing and these accompanying drawings.The feature that all are mentioned in above stated specification and Feature Combination and following, that mention in the description of the drawings and/or the feature that illustrates separately in the accompanying drawings and Feature Combination are not only in the combination that indicates separately, and other combinations in scope of the present invention or can use individually.
Description of drawings
By each preferred embodiment, also with reference to accompanying drawing, illustrate in more detail the present invention now.Accompanying drawing illustrates:
Fig. 1 is according to the schematic and highly abstract view of the home appliances of the first embodiment; With
Fig. 2 is according to the schematic and highly abstract view of the home appliances of the second embodiment.
In the accompanying drawings, the identical element identical with function represents with identical Reference numeral respectively.
The specific embodiment
In an embodiment, the home appliances shown in Fig. 11 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 family expenses utensil 1.Cleaning-drum 2 can for example flatly be bearing in the home appliances 1, and namely it can rotate around the rotation of level.Cleaning-drum 2 can with safety lead PE electric coupling.
Washings 3 has Ohmic resistance, and this Ohmic resistance is schematically signified by element 4 in Fig. 1.That is, washings resistance 4 is not the member of circuit, but the resistance of washings 3.Wet washings 3 has little resistance 4, and has such relation: washings 3 is drier, and washings resistance 4 is larger.Washings resistance 4 is inversely proportional to the conduction value of washings 3.
Now interested is to determine washings resistance 4, and it is the tolerance of the aridity of washings 3.For this purpose, provide measurement mechanism 5 in family expenses utensil 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 is installed on the cleaning-drum 2, and namely mode is, so that their electrically insulated from one another.Measurement electrode 6,7 is arranged spaced reciprocally, for example is arranged on two sides opposite each other of cleaning-drum 2.Measurement electrode 6,7 can be for example be arranged on the circumference of cleaning-drum 2 along the diameter of cleaning-drum 2.In service at family expenses utensil 1, measurement electrode 6,7 contact washings 3, thus washings resistance 4 is coupled on the measurement electrode 6,7.Can say, washings resistance 4 is connected electrically between the measurement electrode 6,7.
Measurement electrode 6,7 and circuit arrangement 8 electric coupling, this circuit arrangement 8 is used for determining washings resistance 4, and determines thus the aridity of washings 3.Circuit arrangement 8 comprises the microcontroller 9 as control device.Circuit arrangement 8 also comprises circuit node 10, provides positive potential V at this circuit node 10
1Electromotive force V
1Can for example be 5V.Produce thus the direct current electric pressure of 5V at circuit node 10, with respect to reference potential 11(ground wire).
In the scope of current explaination, the measuring method that will describe below microcontroller 9 at first is used for carrying out in circuit arrangement 8.About the further application of measurement result in the method that is used for dry washing material 3, microcontroller 9 also can be carried out the control to other building blocks of home appliances 1, and itself uses these measured values thus; It is contemplated that equally, microcontroller 9 only is used for operation circuit arrangement 8 and carries out this measuring method, and the measurement result that obtains is derived to another not shown microcontroller, and this another microcontroller is responsible for using measurement result and is controlled real dry run.This can especially realize by corresponding digital interface.
Circuit arrangement 8 comprises that the first divider 12, the first divider 12 have two Ohmic resistances, i.e. the first resistance 13 and the second resistance 14.The first measurement electrode 6 alternately provides electromotive force V by the first resistance 13 and node 15 couplings on node 15
1With reference potential 11.And the second measurement electrode 7 equally alternately provides electromotive force V by the second resistance 14 and node 16 couplings on node 16
1With reference potential 11, wherein with node 15 anti-beats.
Circuit arrangement 8 comprises that also the second divider 17, the second divider 17 have two Ohmic resistances equally: the first resistance 18 and the second resistance 19.The first measurement electrode 6 is by first resistance 18 and node 20 couplings of the second divider 17.On node 20, can alternately provide electromotive force V
1With reference potential 11.Correspondingly, the second measurement electrode 7 is by second resistance 19 and node 21 couplings of the second divider 17.On node 21, also can alternately provide electromotive force V
1With reference potential 11, wherein with node 20 anti-beats.
Thus, for the first divider 12, obtain the series circuit that is formed by resistance 13,14 and washings resistance 4.If sense now the washings voltage U w that between measurement electrode 6,7, descends, then can obtain washings resistance 4, and can determine the aridity of washings 3.Similarly, for the second divider 17, obtain the series circuit that is formed by resistance 18,19 and washings resistance 4.
Circuit arrangement 8 also comprises some switching devices 22, by them, node 15,16,20 and 21 can with electromotive force V
1Perhaps reference potential 11 is electrically connected.Switching device 22 comprises that the emitter stage of a NPN bipolar transistor 23, the one NPN bipolar transistors 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 and microcontroller 9 couplings.The 2nd NPN bipolar transistor 24 can be coupled node 15 and reference potential 11: 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 also is coupled with microcontroller 9.Switching device 22 comprises that also the colelctor electrode of the 3rd NPN bipolar transistor 25, the three NPN bipolar transistors 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 also is coupled with microcontroller 9.The 4th NPN bipolar transistor 26 can be with node 16 and reference potential 11 couplings; 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.
As explained, the voltage U w that can sensing descends at washings 3 of microcontroller 9.For this purpose, the first measurement electrode 6 is by measurement input 32 couplings of ohm measuring resistance 31 with microcontroller 9.Correspondingly, the second measurement electrode 7 is measured input 34 couplings by another ohm measuring resistance 33 and second of microcontroller 9.Node 35 between measuring resistance 31 and the first measurement electrode 6 is by capacitor 36 and reference potential 11 couplings.In addition, the node 37 of measuring between the input 32 at measuring resistance 31 and first is coupled by capacitor 38 and reference potential 11.Correspondingly, the node between the second measurement electrode 7 and measuring resistance 33 39 is by capacitor 40 and reference potential 11 couplings; The node 41 of measuring between the input 34 at measuring resistance 33 and second is coupled by capacitor 42 and reference potential 11.9 measurements of microcontroller are applied to the voltage on capacitor 38 and 42 and can instead release washings voltage U w thus.More precisely, microcontroller 9 sensings are applied to the electromotive force on node 37 and 41, and the difference of described electromotive force is measuring of washings voltage U w.Again can be in the hope of washings resistance 4 according to washings voltage U w, and also try to achieve thus the aridity of washings 3, for example by the form of storage.
In addition, also provide protecting component in circuit arrangement 8, form is NPN bipolar transistor 43 to 46.At this, the task of bipolar transistor 43 to 46 is that restriction appears at the electromotive force on the measurement electrode 6,7.Bipolar transistor 43 to 46 base stage separately is connected with separately emitter stage electrical short.The colelctor electrode of bipolar transistor 43 is connected with circuit node 10, provides electromotive force V at circuit node 10
1The emitter stage of bipolar transistor 43 is connected with node 35.Node 35 also is 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 connected with the emitter stage of bipolar transistor 45 and 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 in more detail that now measurement mechanism 5 is in family expenses utensil 1 operating working method: in service at family expenses utensil 1, microcontroller 9 is known washings resistance 4 and is known thus the aridity of washings 3, can calculate thus until the required time of normal termination dry run.Namely when washings 3 is dry, just finish dry run.
Washings 3 be wet or in the situation that washings resistance 4 is little, bipolar transistor 23 to 26 is controlled like this by microcontroller 26, so that alternately apply positive potential V on node 15
1With reference potential 11, and always alternately apply on the node 16 from node 15 on different electromotive force V
1Perhaps electromotive force 11.This reversal is for example carried out with the frequency of 400Hz.Therefore, a DC current I flows through measurement electrode 6,7 and also flows through thus washings 3, the continuously conversion of direction of this DC current I.This direction conversion is because electromotive force V
1With 11 on node 15 and 16 the periodicity reverse and realize.Can say, electric current I is symmetrical rectangle electric current.
When the electric current I that flows through measurement electrode 6,7 was changed direction constantly, the amplitude of microcontroller 9 sensing washings voltage U w was wherein being measured sensing on the input 32,34.Flow in which direction on electric current I and to decide, the amplitude of washings voltage U w may slightly change.The plating effect that this slight change of amplitude can may still exist owing to cleaning-drum 2 inside.Yet microcontroller 9 is 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 and determines washings resistance 4 based on the mean value of these amplitudes these amplitudes.Realize the precision fully not impact of the polarizing voltage that may also exist when determining washings resistance 4 by this approach.Therefore, measuring by this difference can be with the aridity of high determine precision washings 3.
In the situation of 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 powers.That the second divider 17 and the first divider are in a ratio of high ohm and have a higher all-in resistance.The all-in resistance of the first divider 12 can be 100K Ω for example, 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 respectively the resistance value of 50K Ω, and the resistance 18,19 of the second divider 17 can have respectively the resistance value of 600K Ω.
Washings 3 is more and more drier during dry run, 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 be measured in relatively large measurement category the amplitude of washings voltage U w.For fear of this situation, begin not re-use the first divider 12 from a determined value of washings voltage U w one determined value or washings resistance 4, replace and use the second divider 17.If namely the amplitude of washings voltage U w reaches predetermined value, then no longer control bipolar transistor 23 to 26, control bipolar transistor 27 to 30 replaces.The control of bipolar transistor 27 to 30 is carried out similarly: node 20 alternately is loaded with electromotive force V with described frequency
1With reference potential 11, node 21 always is loaded with another electromotive force V
1Or electromotive force 11.The high- ohmic resistance 18,19 of measurement electrode 6,7 and the second divider 17 is connected, thereby the dividing potential drop that descends between measurement electrode 6,7 also reduce.Microcontroller 9 can with better resolution measurement washings voltage U w, can almost experience the measurement category of microcontroller 9 for twice thus.
Washings resistance 4 is by bipolar ground and symmetrically measurement.Circuit arrangement 8 electricity are constructed symmetrically, thereby avoid the plating effect of cleaning-drum 2 inside.
As explained, cleaning-drum 2 in principle with safety lead PE electric coupling, wherein for example pass through bearing.Flow to the earth for fear of discharge current by cleaning-drum 2 and safety lead PE, in this embodiment, cleaning-drum 2 or the pre-making alive of safety lead PE are with respect to reference potential 11.For example, cleaning-drum 2 can be loaded one numerically than electromotive force V
1Electromotive force half as large.Can provide divider 47, this divider 47 is at circuit node 10 intercepting electromotive force V for this reason
1And come dividing potential drop by resistance 48,49.Cleaning-drum 2 or safety lead PE can be by resistance 50 and node 51 couplings that are positioned between the resistance 48,49. Resistance 48,49 and 50 can have respectively the resistance value of 10K Ω.
The element of circuit arrangement 8 is following value for example:
-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.
Shown in Figure 2 according to the present invention the home appliances 1 of another embodiment.The working method of measurement mechanism 5 in according to the embodiment of Fig. 2 basically with identical in the embodiment according to Fig. 1.The structure of measurement mechanism 5 is also similar, thereby following elaborates difference.
Circuit arrangement 8 comprises microcontroller 9' here, switching device (among Fig. 1 22) be integrated into this microcontroller 9 ' in.Microcontroller 9' has four joints now, and namely the first joint 52(is corresponding to the node 15 among Fig. 1), the second joint 53(is corresponding to the node 16 among Fig. 1), the 3rd joint 54(is corresponding to the node 20 among Fig. 1) and the 4th joint 55(corresponding to the node 21 among Fig. 1).The first joint 52 is by the first resistance 13 and 6 couplings of the first measurement electrode of the first divider 12, and the second joint 53 is by the second resistance 14 and 7 couplings of the second measurement electrode of the first divider 12.Correspondingly, the 3rd joint 54 is by the first resistance 18 and 6 couplings of the first measurement electrode of the second divider 17, and the 4th joint 55 is by the second resistance 19 and 7 couplings of the second measurement electrode of the second divider 17.Microcontroller 9' also with circuit node 10(electromotive force V
1) connect.
Correspondingly, capacitor 38 and 42 function are born by capacitor 38a and 38b or 42a and 42b now.These capacitors are connected between the corresponding joint 52,54,53,55 and reference potential 11.
In the scope of current explanation, measuring method to be stated below microcontroller 9' also at first is used for carrying out in circuit arrangement 8.The measurement result that like this obtains is in the further application of the method that is used for dry washing material 3, and microcontroller 9' also can add the control of the miscellaneous part of carrying out 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, and the measurement result that obtains is derived to unshowned in the drawings another microcontroller, and this another controller is responsible for controlling real dry run with measurement result.This can especially realize by corresponding digital interface.
In the situation that washings 3 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 always provide on the second joint 53 from first interface 52 on different electromotive force.
Before washings voltage U w reached predetermined value, the third and fourth joint 54,55 was as measuring input (with reference to 32,34 among Fig. 1).Measure washings voltage U w by these joints 54,55.
If washings voltage U w reaches predetermined value or washings resistance 4 raises, then electromotive force V
1Perhaps electromotive force 11 no longer provides on joint 52,53, but provides on joint 54,55. Joint 52,53 is used as measuring input now, measures washings voltage U w on joint 52,53.
Therefore, also be bipolar ground in according to the embodiment of Fig. 2 and measure symmetrically washings resistance 4.Microcontroller 9 ' in four joints 52 to 55 are provided, described four joints decide to be used as in couples input or output 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
The 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, the 38b capacitor
39 nodes
40 capacitors
41 nodes
42,42a, the 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
The I electric current
The PE safety lead
Uw washings voltage
V
1Electromotive force
Claims (14)
1. be used 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 with the aridity of washings (3)
W), wherein, this measurement mechanism (5) comprising:
-two measurement electrode (6,7) that are spaced from each other and arrange, these measurement electrode (6,7) so arrange in family expenses utensil (1), so that these measurement electrode (6,7) are at family expenses utensil (1) contact in service washings (3) to be dried, and
-one circuit arrangement (8) that is coupled with described measurement electrode (6,7), this circuit arrangement (8) are constructed for produce the flow through electric current (I) of measurement electrode (6,7), the washings voltage (U that sensing descends between measurement electrode (6,7)
W) and according to the washings voltage (U of sensing
W) draw and measure parameter (4, U
W),
It is characterized in that, described circuit arrangement (8) is constructed for the repeatedly conversion of sense of current that makes by measurement electrode (6,7).
2. according to claim 1 home appliances (1), it is characterized in that, described circuit arrangement (8) is constructed to such an extent that be used for alternately applying a different electromotive force applying on one in the described measurement electrode (6,7) on an electromotive force and another measurement electrode (6,7) in correspondence.
3. according to claim 1 and 2 home appliances (1) is characterized in that, described circuit arrangement (8) construct the direction that is used for making electric current (I) with a frequency transformation, this frequency is in from 300Hz to the 500Hz codomain.
4. according to the home appliances (1) of any one in the aforementioned claim, it is characterized in that, described circuit arrangement (8) is constructed to such an extent that be used for both being pursuant to the washings voltage (U that a direction for electric current (I) produces
W), also be 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 any one in the aforementioned claim, 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) is constructed for the electric current (I) that produces this divider (12) of flowing through.
6. according to claim 5 home appliances (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 the first and second electromotive force (V
1, 11) and coupling.
7. according to claim 6 home appliances (1) is characterized in that described the first electromotive force (V
1) be positive potential, described the second electromotive force (11) is for comparing little positive potential or be reference potential (11) with described the first electromotive force (11).
8. the home appliances (1) of any one in 7 according to claim 5, it is characterized in that, described circuit arrangement (8) has one second divider (17), this second divider (17) has with the first divider (12) compares numerically larger all-in resistance, and this circuit arrangement (8) is constructed to such an extent that be used at described measurement parameter (4, U
W) reach and get around the first divider (12) behind the predetermined value and produce described electric current (I) by the second divider (17).
9. according to claim 6 home appliances (1) is characterized in that, described the 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 resistance (18) by the second divider (17) of the first measurement electrode (6) behind the predetermined value 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 the second resistance (19) by 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 any one in the aforementioned claim, it is characterized in that, described circuit arrangement (8) has the switching device (22) for the direction of the described electric current of conversion (I).
11. home appliances according to claim 10 (1) is characterized in that, described circuit arrangement (8) has microcontroller (9') and described switching device (22) is integrated in this microcontroller (9').
12. home appliances according to claim 10 (1) is characterized in that, described switching device (22) is the switching device (22) that the microcontroller (9) with described circuit arrangement (8) separates.
13. according to the described home appliances of any one in the aforementioned claim (1), it is characterized in that, the first measurement electrode (6) in the 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 the 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 numerically is in described the first and second electromotive force (11, V
1) between.
14. be used for determining measurement parameter (4, the U relevant with washings (3) aridity by measurement mechanism (5) at family expenses utensil (1)
W) method, washings (3) is dried in this home appliances (1), the method has following steps:
-producing by the turn up the soil electric current (I) of the measurement electrode (6,7) of arranging of two spaces, described measurement electrode (6,7) is so arranged in this home appliances (1), so that described measurement electrode (6,7) contact washings (3) to be dried,
Washings voltage (the U that-sensing descends between these two measurement electrode (6,7)
W), and
-according to the washings voltage (U of sensing
W) draw described measurement parameter (4, U
W),
It is characterized in that, make the repeatedly conversion of direction by the described electric current (I) of described measurement electrode (6,7).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010038890.4 | 2010-08-04 | ||
| 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 |
| 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 true CN103052745A (en) | 2013-04-17 |
| CN103052745B 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 |
| EP3162952B1 (en) | 2015-10-26 | 2019-04-03 | 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 |
| AU2016434982B2 (en) | 2016-12-28 | 2023-09-28 | Electrolux Appliances Aktiebolag | Appliance with reliable information of a drying cycle |
| KR20190093605A (en) | 2016-12-28 | 2019-08-09 | 일렉트로룩스 어플라이언스 아크티에볼레그 | Laundry machine with humidity sensor |
| KR102511833B1 (en) | 2018-03-07 | 2023-03-17 | 일렉트로룩스 어플라이언스 아크티에볼레그 | Devices with capacitive humidity sensors |
| 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 EA EA201390104A patent/EA023640B1/en not_active IP Right Cessation
- 2011-07-19 CN CN201180038226.5A patent/CN103052745B/en active Active
- 2011-07-19 PL PL11733864T patent/PL2601339T3/en unknown
- 2011-07-19 WO PCT/EP2011/062346 patent/WO2012016820A2/en active Application Filing
- 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 |
| EP2601339B1 (en) | 2014-04-30 |
| CN103052745B (en) | 2015-01-21 |
| EP2601339A2 (en) | 2013-06-12 |
| WO2012016820A3 (en) | 2012-08-16 |
| EA023640B1 (en) | 2016-06-30 |
| EA201390104A1 (en) | 2013-07-30 |
| WO2012016820A2 (en) | 2012-02-09 |
| DE102010038890A1 (en) | 2012-02-09 |
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| SE01 | Entry into force of request for substantive examination | ||
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| GR01 | Patent grant | ||
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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. |