JP2563560B2 - Washing machine controller - Google Patents
Washing machine controllerInfo
- Publication number
- JP2563560B2 JP2563560B2 JP1038578A JP3857889A JP2563560B2 JP 2563560 B2 JP2563560 B2 JP 2563560B2 JP 1038578 A JP1038578 A JP 1038578A JP 3857889 A JP3857889 A JP 3857889A JP 2563560 B2 JP2563560 B2 JP 2563560B2
- Authority
- JP
- Japan
- Prior art keywords
- light emitting
- output voltage
- turbidity
- circuit
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Control Of Washing Machine And Dryer (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は洗濯槽内の洗濯液の濁度を検出して洗濯運転
の制御を行なう洗濯機の制御装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine control device that detects the turbidity of a washing liquid in a washing tub to control a washing operation.
従来の技術 従来のこの種の洗濯機の制御装置は、例えば特開昭61
−159997号公報に示されているように、第８図のような
構造になていた。2. Description of the Related Art A conventional control device for a washing machine of this type is disclosed in, for example, JP-A-61
As shown in JP-A-159997, the structure was as shown in FIG.
すなわち、洗濯槽内に連通状態にありパルセータの回
転時に洗濯槽内の洗浄液が流通する連通管18の相対向し
て設けた透明な検知窓19に、発光素子20,受光素子21を
取付け、この発光素子20,受光素子21の少なくとも何れ
か一方に補正抵抗22もしくは23を接続し、この補正抵抗
により濁度検出器のばらつき補正を行なっていた。That is, the light-emitting element 20, the light-receiving element 21 is attached to the transparent detection windows 19 that are provided facing each other of the communication pipe 18 in which the cleaning liquid in the washing tub flows when the pulsator is in rotation and is in communication with the washing tub. A correction resistor 22 or 23 is connected to at least one of the light emitting element 20 and the light receiving element 21, and the variation of the turbidity detector is corrected by this correction resistor.
また、濁度検出器の発光素子に電流を流す回路として
は、一般的に第９図に示すようなものが知られている。A circuit shown in FIG. 9 is generally known as a circuit for passing a current through the light emitting element of the turbidity detector.
図において、24,25,26,27は発光素子20の駆動電流を
制限する制限抵抗、28はトランジスタアレイで、マイク
ロコンピュータ29からの出力信号により抵抗24,25,26,2
7に電流を流す。この電流は、マイクロコンピュータ29
の出力信号の組合せで、24−１＝15通りの駆動電流を設
定できる。30は受光素子21の負荷電流を電圧に変換する
抵抗である。そして、この受光素子21の出力電圧をマイ
クロコンピュータ29に入力し、この出力電圧が洗濯工程
の初期に一定電圧以上になるように、抵抗24,25,26,27
の組合せを決定するようになっていた。In the figure, 24, 25, 26, 27 are limiting resistors for limiting the drive current of the light emitting element 20, 28 is a transistor array, and resistors 24, 25, 26, 2 are provided by the output signal from the microcomputer 29.
Apply current to 7. This current is
By combining the output signals of, it is possible to set 2 4 −1 = 15 different drive currents. Reference numeral 30 is a resistor for converting the load current of the light receiving element 21 into a voltage. Then, the output voltage of the light receiving element 21 is input to the microcomputer 29, and the resistances 24, 25, 26, 27 are set so that the output voltage becomes equal to or higher than a certain voltage at the beginning of the washing process.
It was supposed to decide the combination of.
発明が解決しようとする課題 しかし、特開昭61−159997号公報のような構成のもの
では、濁度検出器の発光素子20,受光素子21自身のばら
つきを抑えるための補正抵抗22,23を濁度検出器側に取
付けなければならない。この補正抵抗22,23を取付ける
ためには、洗濯機の制御回路とは別のプリント基板が必
要となり、かつ、そのプリント基板への防湿処理が必要
となる。また、濁度検出器の調整によるばらつき補正は
必ず行なわなければならないため、濁度検出器自身の検
査工程が必要となるという課題があった。However, in the configuration as disclosed in JP-A-61-159997, the correction resistors 22 and 23 for suppressing the variation of the light emitting element 20 and the light receiving element 21 of the turbidity detector are provided. Must be installed on the turbidity detector side. In order to attach the correction resistors 22 and 23, a printed circuit board different from the control circuit of the washing machine is required, and the printed circuit boards need to be moisture-proofed. In addition, there is a problem that the turbidity detector itself must be inspected, because the variation correction by adjusting the turbidity detector must be performed without fail.
つぎに、第９図で示したような構成では、発光素子の
駆動電流は、最大でも15通りの電流の設定しかできない
ため、洗濯工程の初期に受光素子４の出力電圧を調整す
るときの出力電圧も最大で15通りの電圧しかでないこと
になる。この駆動電流と出力電圧との関係としてはたと
えば第10図に示すように階段上の関係となる。これか
ら、出力電圧を2.5Vに設定したいとすると、駆動電流30
mAでは、2.3V、駆動電流40mAでは2.7Vとなり、マイクロ
コンピュータ29としては、駆動電流40mAを流すように設
定してしまうため、実際では35mAの駆動電流で2.5Vを確
保できるのに、それよりも5mA多い電流を流すことにな
ってしまい、消費電力が増加するという課題を有してい
た。Next, in the configuration as shown in FIG. 9, the drive current of the light emitting element can be set to only 15 kinds of current at maximum, so that the output when adjusting the output voltage of the light receiving element 4 at the beginning of the washing process. The voltage is only 15 kinds at maximum. The relationship between the drive current and the output voltage has a stepwise relationship as shown in FIG. 10, for example. From now on, if you want to set the output voltage to 2.5V, drive current 30
At mA, it becomes 2.3V, at drive current 40mA it becomes 2.7V, and since the microcomputer 29 is set to flow the drive current 40mA, 2.5V can be secured at the drive current of 35mA, but more than that. However, there was a problem that the current consumption would increase by 5mA, which would increase the power consumption.
また、この駆動電流の制御性能を向上させるには、制
限抵抗の組合せを増やす必要があり、マイクロコンピュ
ータの制御が複雑になるなどの課題があった。Further, in order to improve the control performance of the drive current, it is necessary to increase the combination of limiting resistors, which causes a problem that the control of the microcomputer becomes complicated.
そこで、本発明は濁度検出器の発光素子及び受光素子
のばらつきを補正する補正抵抗をなくし、洗濯機の簡単
な制御回路による自動補正機能を得ることを第１の目的
としている。Therefore, a first object of the present invention is to eliminate the correction resistor for correcting the variation of the light emitting element and the light receiving element of the turbidity detector and obtain an automatic correction function by a simple control circuit of the washing machine.
第２の目的は濁度検出器の発光素子の駆動電流の低消
費電力化を図ることにある。The second purpose is to reduce the power consumption of the drive current of the light emitting element of the turbidity detector.
また第３の目的は濁度検出器の感度性能向上を図るこ
とにある。A third object is to improve the sensitivity performance of the turbidity detector.
課題を解決するための手段 そして上記第１の目的を達成するために本発明は、発
光素子と受光素子とを対峙させて洗濯液の濁度変化を検
出する濁度検出器と、パルスを発生すると共にそのパル
スのデューティ比が変化可能なパルス発生回路と、この
パルス発生回路からのパルスを入力し、そのデューティ
比に応じた電圧を発生する積分回路と、この積分回路の
出力電圧に応じた定電流を前記濁度検出器の発光素子に
流す定電流回路とを設けたものである。Means for Solving the Problems And, in order to achieve the above-mentioned first object, the present invention provides a turbidity detector for detecting a turbidity change of a washing liquid by causing a light emitting element and a light receiving element to face each other, and generating a pulse. And a pulse generation circuit whose pulse duty ratio can be changed, an integration circuit which receives a pulse from this pulse generation circuit and generates a voltage corresponding to the duty ratio, and an output voltage of this integration circuit. A constant current circuit for supplying a constant current to the light emitting element of the turbidity detector is provided.
また第２の目的を達成するために、本発明は前記定電
流回路に一定周期ごとに一定時間のみ導通するスイッチ
ング手段を設けたものである。Further, in order to achieve the second object, the present invention provides the constant current circuit with a switching means which conducts only for a constant time in a constant cycle.
さらに第３の目的を達成するために、本発明は受光素
子の光電流を電圧変換する電圧変換器とこの電圧変換器
の出力電圧が、濁度検出器の受光素子の最高出力電圧値
になるように洗濯開始初期に設定する設定手段を設けた
ものである。To achieve the third object, the present invention provides a voltage converter for converting the photocurrent of the light receiving element into a voltage and the output voltage of this voltage converter becomes the maximum output voltage value of the light receiving element of the turbidity detector. Thus, the setting means for setting the initial stage of washing start is provided.
作用 本発明の洗濯機の制御装置は、上記構成により、濁度
検出器の発光素子に、パルスのデューティ比に応じて可
変できる安定した電流を流すように作用し、発光素子及
び受光素子自身のばらつきに応じて、電流を無段階に可
変できるようになる。この結果、発光素子及び受光素子
のばらつきを補正する補正抵抗が不必要になる。Action The washing machine control device of the present invention, with the above configuration, acts on the light emitting element of the turbidity detector so that a stable current that can be varied according to the duty ratio of the pulse is caused to flow. The current can be changed steplessly according to the variation. As a result, a correction resistor for correcting variations in the light emitting element and the light receiving element becomes unnecessary.
また定電流回路に一定時間導通するスイッチング手段
により、発光素子の駆動電流の低消費電力化を実現でき
る。Further, it is possible to realize low power consumption of the drive current of the light emitting element by the switching means which is electrically connected to the constant current circuit for a certain time.
さらに洗濯開始初期の濁度検出器の出力電圧を電源電
圧に近い任意の一定電圧に設定することにより、洗濯液
の濁度の変化に対する感度を向上することができるもの
である。Furthermore, by setting the output voltage of the turbidity detector at the beginning of washing to an arbitrary constant voltage close to the power supply voltage, the sensitivity to changes in the turbidity of the washing liquid can be improved.
実 施 例 以下、本発明の一実施例を添付図面にもとづいて説明
する。第１図は全自動洗濯機と概略構成図であり、１は
固定式洗濯外槽、２は槽内液、３は内槽で壁面に多数の
穴を有している。４はパルセータで、内槽３の底部に配
されている。５は槽内液２を排水弁６を通じて排水する
ための排水管で外槽１の底部に接続されている。７はこ
の排水管５に設置された濁度検出器である。濁度検出器
７は、例えば発光ダイオードよりなる発光素子及びホト
トランジスタよりなる受光素子を排水管５に対峙して構
成されている。８はパルセータ４用のモータ、９はモー
タ制御部、10は濁度検出器７の発光ダイオードへ電流を
流す電流制御部とホトトランジスタの出力電圧を検出す
る電圧検出部からなる濁度検出制御部である。11は排水
弁制御部、12はマイクロコンピュータにより構成される
回路からなる判断部で、洗濯シーケンス制御のための信
号を出力し、モータ８や排水弁６を制御するとともに、
濁度検出制御部10の発光ダイオードの駆動電流を、洗濯
開始初期に設定し、その後のホトトランジスタの出力電
圧の変化から槽内液２の濁度を判定し洗いやすすぎの終
了判定を行なうものである。Example Hereinafter, one example of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic configuration diagram of a fully automatic washing machine. Reference numeral 1 is a fixed washing outer tub, 2 is a liquor in the tub, and 3 is an inner tub, which has a large number of holes on its wall surface. A pulsator 4 is arranged at the bottom of the inner tank 3. A drain pipe 5 for draining the in-tank liquid 2 through a drain valve 6 is connected to the bottom of the outer tank 1. Reference numeral 7 is a turbidity detector installed in the drain pipe 5. The turbidity detector 7 is configured by facing a drain pipe 5 with a light emitting element including a light emitting diode and a light receiving element including a phototransistor, for example. 8 is a motor for the pulsator 4, 9 is a motor control unit, 10 is a turbidity detection control unit including a current control unit for supplying a current to the light emitting diode of the turbidity detector 7 and a voltage detection unit for detecting the output voltage of the phototransistor. Is. 11 is a drain valve control unit, 12 is a determination unit consisting of a circuit configured by a microcomputer, which outputs a signal for washing sequence control, controls the motor 8 and the drain valve 6, and
The drive current of the light emitting diode of the turbidity detection control unit 10 is set at the initial stage of washing start, and the turbidity of the in-tank solution 2 is determined from the change in the output voltage of the phototransistor after that to determine the end of washing or rinsing. Is.
次に濁度検出器７と濁度検出制御回路部10を第２図よ
り詳しく説明する。濁度検出器７は、駆動電流により槽
内液２に発光する発光素子71およびその透過光を受光し
て電気信号を出力する受光素子72からなり、本例では、
発光素子は発光ダイオードであり、受光素子はホトトラ
ンジスタである。13はパルスを発生すると共にそのパル
スのデューティ比が変化可能なパルス発生回路であり、
14はこのパルス発生回路13からのパルスを入力し、その
デューティ比に応じた電圧を発生する積分回路であり、
15はこの積分回路14の出力電圧に応じた定電流を前記濁
度検出器７の発光素子71に流す定電流回路である。Next, the turbidity detector 7 and the turbidity detection control circuit section 10 will be described in detail with reference to FIG. The turbidity detector 7 includes a light emitting element 71 that emits light into the in-tank liquid 2 by a drive current and a light receiving element 72 that receives the transmitted light and outputs an electric signal.
The light emitting element is a light emitting diode and the light receiving element is a phototransistor. 13 is a pulse generation circuit that generates a pulse and can change the duty ratio of the pulse.
14 is an integrator circuit that receives the pulse from the pulse generator circuit 13 and generates a voltage according to its duty ratio.
Reference numeral 15 is a constant current circuit for supplying a constant current corresponding to the output voltage of the integrating circuit 14 to the light emitting element 71 of the turbidity detector 7.
パルス発生回路13の出力電圧波形は第３図に示すよう
に、周期Ｔは一定であり、ハイレベルのパルス幅tHが変
化することにより、ハイレベルとローレベルのデューテ
ィ比が変化するものである。このパルス信号のローレベ
ルの時は、積分回路14のトランジスタ141がオフとな
り、電源VDDから、抵抗142と抵抗143を通して、コンデ
ンサ144に電流が流れ、コンデンサ144に電圧が充電され
る。また、パルス発生回路13のパルス信号がハイレベル
の時は、トランジスタ141がオンし、コンデンサ144に充
電された電圧が抵抗143及び抵抗145を通して放電され
る。以上のように、コンデンサ144の充放電がパルス発
生回路のパルス信号のデューティ比により繰り返される
ため、パルス信号のハイレベルのパルス幅tHと積分回路
のコンデンサ144に貯まる電圧との関係は第４図に示さ
れるものとなる。すなわち、パルス信号のハイレベルの
パルス幅tHが長くなれば、コンデンサ144の電圧は低く
なり、その関係は直線的なものである。As shown in FIG. 3, the output voltage waveform of the pulse generation circuit 13 is such that the cycle T is constant, and the duty ratio between the high level and the low level changes as the pulse width t H of the high level changes. is there. When the pulse signal is at the low level, the transistor 141 of the integrating circuit 14 is turned off, a current flows from the power supply V DD to the capacitor 144 through the resistors 142 and 143, and the capacitor 144 is charged with the voltage. Further, when the pulse signal of the pulse generation circuit 13 is at a high level, the transistor 141 is turned on and the voltage charged in the capacitor 144 is discharged through the resistors 143 and 145. As described above, since the charging and discharging of the capacitor 144 is repeated depending on the duty ratio of the pulse signal of the pulse generating circuit, the relationship between the high-level pulse width t H of the pulse signal and the voltage accumulated in the capacitor 144 of the integrating circuit is the fourth. It will be as shown in the figure. That is, as the high-level pulse width t H of the pulse signal becomes longer, the voltage of the capacitor 144 becomes lower, and the relationship is linear.
次に、積分回路14のコンデンサ144の出力電圧を定電
流回路15のトランジスタ151のベース端子に入力し、さ
らにこのトランジスタ151のエミッタ端子は抵抗152を通
して、トランジスタ153のベース端子に入力している。
そして、このトランジスタ153のコレクタ端子に濁度検
出器７の発光ダイオード71を接続し、トランジスタ153
のエミッタにこの発光ダイオード71の駆動電流制限抵抗
154を接続しており、この回路により、発光ダイオード7
1に、前記積分回路の出力電圧に応じた定電流を流す定
電流回路を構成するものである。そして、発光ダイオー
ド71に流れる電流IFは積分回路14の出力電圧をV0,トラ
ンジスタ151のベース・エミッタ電圧をVBE1,トランジス
タ152のベース・エミッタ電圧をVBE2とすると以下の式
で表わせる。Next, the output voltage of the capacitor 144 of the integrating circuit 14 is input to the base terminal of the transistor 151 of the constant current circuit 15, and the emitter terminal of this transistor 151 is input to the base terminal of the transistor 153 through the resistor 152.
Then, the light emitting diode 71 of the turbidity detector 7 is connected to the collector terminal of the transistor 153,
The drive current limiting resistor of this light emitting diode 71 is
154 is connected, and this circuit allows the light emitting diode 7
In 1, a constant current circuit for flowing a constant current according to the output voltage of the integrating circuit is configured. Then, expressed the current I F flowing through the light emitting diode 71 is the output voltage of the integrating circuit 14 V 0, the base-emitter voltage of the transistor 151 V BE1, the base-emitter voltage of the transistor 152 in the following equations to V BE2 .
IF＝（V0−VBE1−VBE2）／（R154＋R152/hFE2） hFE2:トランジスタ153の直流電流増幅率 ここで、VBE1＝VBE2,hFE2→∞,R1520とすると IF≒（V0−2VBE）/R154となる。I F = (V 0 −V BE1 −V BE2 ) / (R 154 + R 152 / h FE2 ) h FE2 : DC current amplification factor of transistor 153 where V BE1 = V BE2 , h FE2 → ∞, R 152 0 Then, I F ≈ (V 0 −2V BE ) / R 154 .
この関係を第５図に示す。 This relationship is shown in FIG.
すなわち、パルス発生回路13のパルスのデューテイ比
を変化させれば、積分回路14の出力電圧が変化し、積分
回路14の出力電圧が変化すれば、それに応じて濁度検出
器７の発光ダイオードの駆動電流が変化し、その変化は
直線状の変化となるものである。That is, if the duty ratio of the pulse of the pulse generating circuit 13 is changed, the output voltage of the integrating circuit 14 is changed, and if the output voltage of the integrating circuit 14 is changed, the light emitting diode of the turbidity detector 7 is changed accordingly. The drive current changes, and the change is a linear change.
ここで、濁度検出器７の発光ダイオード71に流す電流
は、洗濯開始初期（給水前や給水後の一定時間撹拌後が
一般的である。）に、受光素子であるホトトランジスタ
72の出力電圧が一定電圧になるような電流を流すように
し、以後この電流を流し続けて、ホトトランジスタ72の
出力電圧の変化から洗いやすすぎの終了判定を行なうも
のであるが、ホトトランジスタ72の出力電圧を洗濯開始
初期に一定電圧になるように制御するときに、発光ダイ
オード71の発光出力のばらつき、あるいはホトトランジ
スタ72の受光感度のばらつき、あるいは排水管５の透明
度のばらつきなどにより、濁度検出器７の発光ダイオー
ドの駆動電流とホトトランジスタの出力電圧との関係が
第６図に示すように２通りの濁度検出器があった場合を
考えてみる。直線Ｉの場合には、ホトトランジスタの出
力電圧をVCにするために必要な発光ダイオードの駆動電
流はIF1であり、直線IIの場合には、IF2である。Here, the current supplied to the light emitting diode 71 of the turbidity detector 7 is a phototransistor which is a light receiving element at the beginning of washing (generally after stirring for a certain period of time after water supply or after water supply).
A current is made to flow so that the output voltage of 72 becomes a constant voltage, and thereafter, this current is continuously made to flow to determine the end of easy washing from the change in the output voltage of the phototransistor 72. When the output voltage is controlled to be a constant voltage at the beginning of washing, turbidity is caused by variations in the light emission output of the light emitting diode 71, variations in the light receiving sensitivity of the phototransistor 72, variations in the transparency of the drainage pipe 5, and the like. Consider a case where there are two types of turbidity detectors as shown in FIG. 6 in the relationship between the drive current of the light emitting diode of the intensity detector 7 and the output voltage of the phototransistor. In the case of the straight line I, the drive current of the light emitting diode required to bring the output voltage of the phototransistor to V C is I F1 , and in the case of the straight line II, I F2 .
すなわち、発光ダイオードの駆動電流を変化させるこ
とにより、ホトトランジスタの出力電圧を一定電圧に調
整することができるものであり、かつ発光ダイオードの
駆動電流が第５図で示したように直線的に無段階で制御
できるため、濁度検出器の特性がどのようにばらついて
も、濁度検出器自体を補正する必要なく、自動的に発光
ダイオードの駆動電流を変化させ、ばらつきを補正でき
る。また従来例で述べたような無駄な電流を流す必要も
なくなるものである。That is, the output voltage of the phototransistor can be adjusted to a constant voltage by changing the drive current of the light emitting diode, and the drive current of the light emitting diode is linearly non-uniform as shown in FIG. Since it can be controlled in stages, no matter how the characteristics of the turbidity detector vary, it is possible to automatically change the drive current of the light emitting diode and correct the variation without having to correct the turbidity detector itself. Further, it is not necessary to pass a wasteful current as described in the conventional example.
次に、濁度検出器７の発光ダイオード71の駆動電流を
常時流すと、発光ダイオード71の温度上昇が発生するた
め、許容損失の大きなものを使用せねばならない。ま
た、温度上昇による信頼性劣化が発生する。これを防ぐ
ため第２図の定電流回路15に一定周期ごとに一定時間の
み導通するスイッチング手段として、トランジスタ16を
設けて、発光ダイオード71の駆動電流のON,OFFを制御す
るようにしている。このスイッチング手段の導通する時
期は、パルセータの右回転→休止→左回転のサイクルに
おける休止期間中に行なうようにする。Next, when the drive current of the light emitting diode 71 of the turbidity detector 7 is constantly supplied, the temperature of the light emitting diode 71 rises. Therefore, a device having a large allowable loss must be used. Further, reliability deterioration due to temperature rise occurs. In order to prevent this, a transistor 16 is provided in the constant current circuit 15 of FIG. 2 as a switching means that conducts for a fixed period of time at a constant cycle to control ON / OFF of the drive current of the light emitting diode 71. The timing of conduction of the switching means is set to be during a rest period in the cycle of right rotation → rest → left rotation of the pulsator.
この結果、発光ダイオード71に定格直流電流よりも大
きなパルス電流を流すこともでき、槽内液２の濁度検出
能力が向上するとともに、低消費電力化も図ることがで
きるものである。As a result, a pulse current larger than the rated direct current can be passed through the light emitting diode 71, the turbidity detection capability of the in-tank liquid 2 can be improved, and the power consumption can be reduced.
次に、濁度検出器７の出力電圧は、受光素子であるホ
トトランジスタ72の光電流を抵抗17により電圧変換する
ことにより得られるものであるが、この電圧は前述した
ように洗濯開始初期に一定電圧になるように発光ダイオ
ード71の駆動電流を制御し、以降この電流は一定に保ち
ながら、槽内液の濁度変化によるホトトランジスタ72の
出力電圧の変化を検知するものであるので、駆動電流の
大きさにより、濁度検出器７の濁度検知能力が影響され
ることになる。この様子を第７図に示す。したがって、
発光ダイオードの駆動電流を増やし、ホトトランジスタ
の出力電圧の最高値になるように駆動電流を設定する設
定手段をマイクロコンピュータ12に設けて、濁度検出器
の濁度検知能力を向上させるようにしたものである。Next, the output voltage of the turbidity detector 7 is obtained by converting the photocurrent of the phototransistor 72, which is a light receiving element, into a voltage by the resistor 17, and this voltage is obtained in the initial stage of washing as described above. The drive current of the light-emitting diode 71 is controlled so as to be a constant voltage, and while this current is kept constant thereafter, the change in the output voltage of the phototransistor 72 due to the change in the turbidity of the liquid in the tank is detected. The magnitude of the current affects the turbidity detection capability of the turbidity detector 7. This state is shown in FIG. Therefore,
The microcomputer 12 is provided with a setting means for increasing the drive current of the light emitting diode and setting the drive current so that the output voltage of the phototransistor becomes the maximum value, thereby improving the turbidity detection capability of the turbidity detector. It is a thing.
発明の効果 以上のように本発明は、パルスのデューティ比が変化
可能なパルス発生回路により濁度検出器の発光素子に流
す駆動電流を任意の電流に設定できるため、濁度検出器
のばらつき補正のための補正抵抗や、補正の手間などが
省け、安価な濁度検出器を実現できる。また発光素子に
流す駆動電流を最適値に設定できるため、無駄な電流を
流す必要がないという効果を有する。EFFECTS OF THE INVENTION As described above, according to the present invention, since the drive current flowing through the light emitting element of the turbidity detector can be set to an arbitrary current by the pulse generation circuit whose pulse duty ratio can be changed, the turbidity detector variation correction can be performed. Therefore, it is possible to realize an inexpensive turbidity detector by omitting the correction resistance and the trouble of correction. In addition, since the drive current flowing through the light emitting element can be set to the optimum value, there is an effect that it is not necessary to supply unnecessary current.
また本発明は、発光素子に電流を流す定電流回路に一
定周期ごとに一定時間のみ導通するスイッチング手段を
設けたものであるので、濁度検出器の発光素子の駆動電
流の大電流化と、大電流化による濁度検出能力の向上を
図り、かつ、低消費電力化も図ることができるものであ
る。Further, according to the present invention, a constant current circuit for supplying a current to the light emitting element is provided with a switching unit that conducts only for a certain period of time at a certain period, so that the drive current of the light emitting element of the turbidity detector is increased. The turbidity detection capability can be improved by increasing the current, and the power consumption can be reduced.
さらに本発明は、濁度検出器の発光素子の最高出力電
圧値になるように、洗濯開始初期に設定するようにした
ものであるので、洗濯機の槽内液の濁度変化の検出能力
を向上させることができるものである。Further, according to the present invention, since the maximum output voltage value of the light emitting element of the turbidity detector is set at the initial stage of washing start, it is possible to detect the turbidity change of the liquid in the tub of the washing machine. It can be improved.
第１図は洗濯機の概略構成ブロック図、第２図は本発明
の一実施例の濁度検出器と濁度検出回路部の回路図、第
３図は同パルス発生回路のパルス出力信号を示す図、第
４図は同パルス出力信号のハイレベル幅と積分回路の出
力電圧との関係を示す図、第５図は同積分回路の出力電
圧と濁度検出器の発光ダイオードの電流との関係を示す
図、第６図は発光ダイオードの駆動電流とホトトランジ
スタの出力電圧との関係を示す図、第７図は洗濯液の濁
度とホトトランジスタの出力電圧との関係を示す図、第
８図は従来の濁度検出器の構成を示す断面図、第９図は
従来の濁度検出回路図、第10図は第９図における発光ダ
イオードの駆動電流とホトトランジスタの出力電圧との
関係を示す図である。 13……パルス発生回路、14……積分回路、15……定電流
回路、７……濁度検出器、16……スイッチング手段、17
……抵抗。FIG. 1 is a schematic block diagram of a washing machine, FIG. 2 is a circuit diagram of a turbidity detector and a turbidity detection circuit unit according to an embodiment of the present invention, and FIG. 3 is a pulse output signal of the pulse generation circuit. FIG. 4 is a diagram showing the relationship between the high level width of the pulse output signal and the output voltage of the integrating circuit, and FIG. 5 is a diagram showing the output voltage of the integrating circuit and the current of the light emitting diode of the turbidity detector. FIG. 6 shows the relationship between the driving current of the light emitting diode and the output voltage of the phototransistor, and FIG. 7 shows the relationship between the turbidity of the washing liquid and the output voltage of the phototransistor. Fig. 8 is a sectional view showing the structure of a conventional turbidity detector, Fig. 9 is a conventional turbidity detection circuit diagram, and Fig. 10 is a relationship between the drive current of the light emitting diode and the output voltage of the phototransistor in Fig. 9. FIG. 13 ... Pulse generation circuit, 14 ... Integration circuit, 15 ... Constant current circuit, 7 ... Turbidity detector, 16 ... Switching means, 17
……resistance.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−137388（ＪＰ，Ａ) 特開 昭62−45086（ＪＰ，Ａ) 特開 昭62−159137（ＪＰ，Ａ) 特開 昭62−80521（ＪＰ，Ａ) 特開 昭61−265193（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-137388 (JP, A) JP-A-62-45086 (JP, A) JP-A-62-159137 (JP, A) JP-A-62- 80521 (JP, A) JP-A-61-265193 (JP, A)
Claims (3)
の濁度変化を検出する濁度検出器と、パルスを発生する
と共にそのパルスのデューティ比が変化可能なパルス発
生回路と、このパルス発生回路からのパルスを入力し、
そのデューティ比に応じた電圧を発生する積分回路と、
この積分回路の出力電圧に応じた定電流を前記濁度検出
器の発光素子に流す定電流回路とを有した洗濯機の制御
装置。1. A turbidity detector for detecting a change in the turbidity of a washing liquid by facing a light emitting element and a light receiving element, a pulse generation circuit capable of generating a pulse and changing the duty ratio of the pulse, and Input the pulse from the pulse generation circuit,
An integrating circuit that generates a voltage according to the duty ratio,
A controller for a washing machine, comprising: a constant current circuit for supplying a constant current corresponding to an output voltage of the integrating circuit to a light emitting element of the turbidity detector.
導通するスイッチング手段を設けた請求項１記載の洗濯
機の制御装置。2. The washing machine control device according to claim 1, wherein the constant current circuit is provided with a switching means that conducts at a constant period for a constant time only.
器とこの電圧変換器の出力電圧が、濁度検出器の受光素
子の最高出力電圧値になるように、洗濯開始初期に設定
する設定手段を設けた請求項１記載の洗濯機の制御装
置。3. A voltage converter for converting the photocurrent of the light receiving element into a voltage, and the output voltage of this voltage converter is set at the initial stage of washing start so that the output voltage of the light receiving element of the turbidity detector becomes the maximum output voltage value. The washing machine control device according to claim 1, further comprising setting means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1038578A JP2563560B2 (en) | 1989-02-17 | 1989-02-17 | Washing machine controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1038578A JP2563560B2 (en) | 1989-02-17 | 1989-02-17 | Washing machine controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02215498A JPH02215498A (en) | 1990-08-28 |
| JP2563560B2 true JP2563560B2 (en) | 1996-12-11 |
Family
ID=12529173
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1038578A Expired - Fee Related JP2563560B2 (en) | 1989-02-17 | 1989-02-17 | Washing machine controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2563560B2 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0793918B2 (en) * | 1992-02-04 | 1995-10-11 | 三洋電機株式会社 | Dishwasher controller |
| EP0612923B1 (en) * | 1993-02-23 | 1999-07-21 | Hitachi, Ltd. | Vortex flow blower and vane wheel therefor |
| DE10135191A1 (en) * | 2001-07-19 | 2003-01-30 | Bsh Bosch Siemens Hausgeraete | Method for operating a water-carrying household appliance and household appliance therefor |
| KR101504129B1 (en) * | 2008-08-13 | 2015-03-19 | 삼성전자 주식회사 | Method of controlling washing machine |
| JP2011050662A (en) * | 2009-09-04 | 2011-03-17 | Panasonic Corp | Washing machine and program therefor |
| CN103852490B (en) * | 2012-12-05 | 2016-06-01 | 佛山市顺德区美的洗涤电器制造有限公司 | The calibration device of turbidity transducer, washing water Turbidity measurement system and detection method |
| JP6784038B2 (en) * | 2016-03-08 | 2020-11-11 | 株式会社島津製作所 | Detector for liquid chromatograph |
-
1989
- 1989-02-17 JP JP1038578A patent/JP2563560B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02215498A (en) | 1990-08-28 |
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