EP0285801B1 - Device for remote control of a vacuum cleaner blowing motor from the handle of the suction hose - Google Patents

Device for remote control of a vacuum cleaner blowing motor from the handle of the suction hose Download PDF

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Publication number
EP0285801B1
EP0285801B1 EP88103022A EP88103022A EP0285801B1 EP 0285801 B1 EP0285801 B1 EP 0285801B1 EP 88103022 A EP88103022 A EP 88103022A EP 88103022 A EP88103022 A EP 88103022A EP 0285801 B1 EP0285801 B1 EP 0285801B1
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EP
European Patent Office
Prior art keywords
control
input
rectifier
voltage
comparator
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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 - Lifetime
Application number
EP88103022A
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German (de)
French (fr)
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EP0285801A1 (en
Inventor
Ehrenhardt Dipl.-Ing. Kaupa (Fh)
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Siemens AG
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Siemens AG
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Priority to AT88103022T priority Critical patent/ATE61921T1/en
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2894—Details related to signal transmission in suction cleaners
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2836—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means characterised by the parts which are controlled
    • A47L9/2842—Suction motors or blowers
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/28—Installation of the electric equipment, e.g. adaptation or attachment to the suction cleaner; Controlling suction cleaners by electric means
    • A47L9/2857—User input or output elements for control, e.g. buttons, switches or displays

Definitions

  • the invention relates to a device for remote control of the blower motor of a vacuum cleaner from the handle of the suction hose.
  • a remote control for the blower motor of a vacuum cleaner in which the two-wire electrical line provided anyway on the suction pipe and suction hose for feeding a motor provided in the suction nozzle for driving a brush roller simultaneously for transmitting control commands for the Speed regulation of the blower motor is used.
  • one wire of the line leading to the motor of the brush roller is interrupted by means of a switching element arranged on the handle of the suction tube and switched over to a one-way rectifier.
  • An integrator arranged in the vacuum cleaner housing is charged by the direct current now flowing in the line. The output voltage of the integrator is used to control an electronic semiconductor switching element located in the circuit of the blower motor.
  • the one-way rectifier consists of diodes that can be connected separately and connected in parallel, so that the speed of the blower motor can be increased or decreased as required.
  • a memory element is connected downstream of the integrator, the output of which is connected to the one input of a comparator, the other input of which is connected to a component providing ramp-shaped signals.
  • the output of the comparator finally controls the semiconductor switching element located in the circuit of the blower motor, so that the desired speed regulation is achieved.
  • the invention is based on the object, while maintaining the two-wire control line, in addition to the power control of the blower motor on the handle, to enable a display for a necessary filter change.
  • a periodic control of the semiconductor switches is achieved in that they are connected together to the control output of an operational amplifier, one control input of which is connected directly to one pole of the control rectifier designed as a single-phase bridge rectifier and the other control input of which is connected to a via a voltage divider via a decoupling diode Control rectifier fed, connected with smoothing DC voltage circuit.
  • a pulsating DC voltage is thus present at one control input of the operational amplifier and a continuous DC voltage is present at the other control input.
  • a blocking signal for the semiconductor switch is present at the control output of the operational amplifier.
  • This periodic control signal can also be used for the speed control of the blower motor, in that the input of the other comparator is connected to the output of the operational amplifier and to this input of the comparator a zener diode, an ohmic resistor and a capacitor are connected in parallel, the resistor and the capacitor connected to the input of the comparator and decoupled from the Zener diode by a diode.
  • the capacitor is charged by the control signal of the operational amplifier, charging by the zener diode being always predetermined to the same voltage level.
  • the capacitor and the resistor are decoupled from the rest of the circuit by the diode, so that the capacitor can only discharge through the resistor. This creates a ramp-like voltage.
  • the comparator sends a control signal to the speed control device. Because the control pulses emitted by the operational amplifier are obtained from the course of the rectified mains voltage, the control signal supplied by the comparator is synchronized with the mains voltage when the comparator is controlled by these control pulses.
  • suction hose 2 with a handle connected to a suction hose 2 is designated.
  • the suction hose 2 is connected to the suction nozzle of a vacuum cleaner housing 3, which contains a blower 4 with a blower motor 5.
  • a vacuum cleaner housing 3 which contains a blower 4 with a blower motor 5.
  • a two-wire control line 7 embedded in the suction hose leads from the board 6 to the handle 1.
  • On this handle 1 there is a controllable resistance element 8 and a light-emitting diode 9 as a display element arranged and connected in series to the two-wire control line 7.
  • the remote control device is supplied with voltage via a transformer 10 fed by the mains voltage U.
  • the secondary winding of this transformer 10 feeds a single-phase bridge rectifier 11 serving as a control rectifier, to the positive pole of which a decoupling diode 12 is connected with its anode.
  • a smoothing capacitor 13 and a Zener diode 14 connected in parallel with it are connected to the cathode side of the decoupling diode 12.
  • a constant current source 15 is also connected with its input to the cathode side of the decoupling diode 12, that is to say to the smoothed DC voltage circuit.
  • One wire of the constant current source 15 is connected and the other wire of the control line 7 is connected to the negative pole of the bridge rectifier 11.
  • a peak value rectifier 17 with its input 18 is also connected to the output of the constant current source 15 via an input resistor 16.
  • a first semiconductor switch 19 with its load path is connected between the input 18 of the peak value rectifier 17 and the negative pole of the bridge rectifier 11. With its control input, this first semiconductor switch 19 is connected via a control resistor 20 at the output of an operational amplifier 21.
  • the operational amplifier 21 controls the first semiconductor switch 19 periodically on and off. In order to be able to generate periodic control pulses, the operational amplifier 21 is connected with its one control input to the positive pole of the bridge rectifier 11, this connection possibly also being able to take place via a voltage divider.
  • the other control input of the operational amplifier 21 is connected to the smoothed direct voltage circuit (cathode side of the decoupling diode 12) via a voltage divider 22.
  • the output of the operational amplifier 21 is also also led to the one input of a comparator 23.
  • a zener diode 24, an ohmic resistor 25 and a capacitor 26 are connected in parallel between this input and the negative pole of the bridge rectifier 11, the resistor 25 and the capacitor 26 being decoupled from the zener diode 24 by a diode 27.
  • the other input of the comparator 23 is connected to the output of the peak value rectifier 17.
  • the output of the comparator 23 is connected to the base of a control transistor 29 arranged in the circuit of an optocoupler 28.
  • a power stage 30, which is connected in series with the blower motor 5, is controlled by the optocoupler 28, which is used for electrical isolation between the mains voltage and the voltage circuit of the circuit board 6.
  • the visual display of a necessary filter change can be controlled in two ways, depending on whether a pressure switch with an opener or a closer is provided. If a pressure switch with a break contact 31 is used, the switching path of this break contact 31 becomes the input resistor 16 of the peak value rectifier 17 connected in parallel. If, on the other hand, a pressure switch with a make contact 32 is available, then, as indicated by the dashed line in FIG.
  • the light-emitting diode 9 is connected to the direct voltage diagonal of a full-wave rectifier 34.
  • the remote control device works as follows:
  • the level of the voltage drop across the series connection of this resistance element 8 and the light-emitting diode 9 is changed. Via the input resistor 16, this voltage is present at the input 18 of the peak value rectifier 17 when the first semiconductor switch 19 is blocked. As already mentioned, the first semiconductor switch 19 is periodically opened and closed by the operational amplifier 21.
  • the periodic sequence of the control pulses of the operational amplifier 21 arises from the fact that the DC voltage of the bridge rectifier 11 pulsating in the form of sine half-waves is applied to one input of the operational amplifier 21 and the continuous DC voltage prevailing on the cathode side of the decoupling diode 12 is applied to the other input of the operational amplifier 21 .
  • a corresponding response value for the operational amplifier 21 can be predetermined by the voltage divider 22.
  • At the output of the operational amplifier 21 there is a blocking signal for the first semiconductor switch 19 when the one control input sinusoidal voltage is lower than the continuous DC voltage applied to the other control input. If the sinusoidal voltage rises above the value of the continuous DC voltage present at the other input, a control signal for the first semiconductor switch 19 appears at the output of the operational amplifier 21.
  • the semiconductor switch 19 is thus switched on and off in synchronism with the mains voltage U.
  • the voltage pulse present at the input 18 of the peak value rectifier 17 during the blocking of the first semiconductor switch 19 causes a continuous DC voltage at the output of the peak value rectifier 17, the level of which depends on the level of the voltage pulse.
  • the DC voltage appearing at the output of the peak value rectifier 17 is thus proportional to the voltage drop set by the resistance element 8.
  • the first semiconductor switch 19 Since the sinusoidal voltage applied to one input of the operational amplifier 21 is only smaller than the continuous direct voltage applied to the other input of the operational amplifier 21 for a short period of time, the first semiconductor switch 19 is only blocked for a correspondingly short time. During the rest of the sine half-wave, the first semiconductor switch 19 is turned on and thus short-circuits the series connection of the resistance element 8 and the light-emitting diode 9 via the break contact 31 of the pressure switch. The light-emitting diode thus remains dark, since the short voltage pulse during the blocking time of the first semiconductor switch 19 is not sufficient to make the light-emitting diode 9 perceptibly light up.
  • the pressure switch responds at a certain filling level of the filter bag, then the short-circuit circuit for the series connection of the resistance element 8 is opened by the opener 31 and the LED 9 interrupted.
  • the light-emitting diode 9 now receives a current sufficient to light up and thereby signals a necessary filter change.
  • the power control of the blower motor is possible.
  • the voltage pulses generated by the opening and closing of the first semiconductor switch 19 at the input 18 of the peak value rectifier 17 are converted into a continuous DC voltage with a proportional amplitude.
  • This DC voltage which is proportional to the voltage drop set by the resistance element 8, is fed to one input of the comparator 23.
  • this comparator 23 there is a comparison of the continuous DC voltage, the level of which can be changed by resetting the resistance element 8, with the ramp-shaped voltage present at the other input.
  • This ramp-shaped voltage arises from the fact that the capacitor 26 is charged by a positive control pulse from the operational amplifier 21.
  • the upstream diode 24 limits the charging of the capacitor 26 to a constant voltage level.
  • the capacitor 26 begins to discharge via the ohmic resistor 25, the discharge circuit being decoupled from the rest of the circuit by the diode 27. Due to the discharge of the capacitor 26, the voltage present at the relevant control input of the comparator 23 drops. As soon as this voltage drops below the level of the voltage present at the other control input, the comparator 23 emits a control signal by which the control transistor 29 is turned on and thereby activates the optocoupler 28, which in turn controls the power stage 30 of the blower motor 5 accordingly.
  • a pressure switch with a closer 32 is used instead of a pressure switch with an opener 31, then a modification of the circuit is necessary.
  • a second semiconductor switch 33 is provided in this case, which is connected in parallel with the series circuit with its load path (collector-emitter path).
  • the control path (base-emitter path) of the second semiconductor switching element 33 is short-circuited by the make contact 32 of the pressure switch, and the second semiconductor switch 33 is thereby permanently blocked.
  • the light-emitting diode 9 thus has a current duration sufficient for lighting up.
  • the second semiconductor switch 33 is periodically opened and closed by the operational amplifier 21 via the base resistor 35 connected upstream of its base.
  • the correspondingly short blocking phase of the second semiconductor switch 33 is not sufficient to cause the light emitting diode 9 to light up.
  • the first semiconductor switch 19 is driven in parallel with the second semiconductor switch 33 by the operational amplifier 21, and the voltage pulses necessary for the peak value rectifier 17 are thus generated. Even after the pressure switch has responded and as a result caused blocking of the second semiconductor switch 33, the periodic control of the first semiconductor switch 19 is maintained, so that the performance of the blower motor 5 can still be controlled by adjusting the resistance element 8.
  • the remote control device described thus comes from the handle 1 for the power control of the blower motor 5 and the simultaneous display of a necessary filter change on the handle 1 with a two-wire control line 7.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Vacuum Cleaner (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Catching Or Destruction (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

In known devices of this type, only the power of the blowing motor can be controlled. The intention of the new arrangement is also to allow an indication of a necessary filter change whilst maintaining a twin-core control line embedded in the suction hose. For this purpose, an adjustable resistance element (8) with a light diode (9) is switched in series on the handle (1) of the suction hose (2). By periodic short-circuiting of this series circuit, voltage pulses are produced which are converted by means of a peak value rectifier (17) into a continuous direct voltage, by means of which the pulse length of the control pulses generated by a comparator (23) is determined. The power stage of the blowing motor (5) is controlled by the control pulses of the comparator (23). By means of a pressure switch, which is actuated at a certain degree of filling of the filter bag, the periodic short-circuiting of the series circuit of the resistance element (8) and the light diode (9) is interrupted. Illumination of the light diode (9) is effected by the now continuously present voltage. <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung zur Fernsteuerung des Gebläsemotors eines Staubsaugers vom Handgriff des Saugschlauches aus.The invention relates to a device for remote control of the blower motor of a vacuum cleaner from the handle of the suction hose.

Durch die EP-A-0 136 357 ist eine Fernsteuerung für den Gebläsemotor eines Staubsaugers bekannt, bei der die ohnehin am Saugrohr und Saugschlauch für die Speisung eines im Saugmundstück zum Antrieb einer Bürstenwalze vorgesehenen Motors vorhandene zweiadrige elektrische Leitung gleichzeitig zum Übertragen von Steuerbefehlen für die Drehzahlregulierung des Gebläsemotors genutzt wird. Zum Übertragen der Steuerbefehle wird eine Ader der zum Motor der Bürstenwalze führenden Leitung mittels eines am Handgriff des Saugrohres angeordneten Schaltelementes unterbrochen und auf einen Einweggleichrichter umgeschaltet. Durch den nunmehr in der Leitung fließenden Gleichstrom wird ein im Staubsaugergehäuse angeordneter Integrator aufgeladen. Die Ausgangsspannung des Integrators dient zur Steuerung eines im Stromkreis des Gebläsemotors liegenden elektronischen Halbleiterschaltelementes.From EP-A-0 136 357 a remote control for the blower motor of a vacuum cleaner is known, in which the two-wire electrical line provided anyway on the suction pipe and suction hose for feeding a motor provided in the suction nozzle for driving a brush roller simultaneously for transmitting control commands for the Speed regulation of the blower motor is used. To transmit the control commands, one wire of the line leading to the motor of the brush roller is interrupted by means of a switching element arranged on the handle of the suction tube and switched over to a one-way rectifier. An integrator arranged in the vacuum cleaner housing is charged by the direct current now flowing in the line. The output voltage of the integrator is used to control an electronic semiconductor switching element located in the circuit of the blower motor.

Der Einweggleichrichter besteht aus getrennt anschaltbaren antiparallel geschalteten Dioden, so daß die Drehzahl des Gebläsemotors je nach Wunsch erhöht oder vermindert werden kann. Dem Integrator ist ein Speicherglied nachgeschaltet, dessen Ausgang mit dem einen Eingang eines Komparators verbunden ist, dessen anderer Eingang an ein rampenförmige Signale lieferndes Bauteil angeschlossen ist. Der Ausgang des Komparators steuert schließlich das im Stromkreis des Gebläsemotors liegende Halbleiterschaltelement, so daß die gewünschte Drehzahlregulierung erreicht wird.The one-way rectifier consists of diodes that can be connected separately and connected in parallel, so that the speed of the blower motor can be increased or decreased as required. A memory element is connected downstream of the integrator, the output of which is connected to the one input of a comparator, the other input of which is connected to a component providing ramp-shaped signals. The output of the comparator finally controls the semiconductor switching element located in the circuit of the blower motor, so that the desired speed regulation is achieved.

Der Erfindung liegt die Aufgabe zugrunde, unter Beibehaltung der zweiadrigen Steuerleitung zusätzlich zu der Leistungssteuerung des Gebläsemotors am Handgriff noch eine Anzeige für einen notwendigen Filterwechsel zu ermöglichen.The invention is based on the object, while maintaining the two-wire control line, in addition to the power control of the blower motor on the handle, to enable a display for a necessary filter change.

Die Lösung der gestellten Aufgabe gelingt durch die im Patentanspruch 1 angegebenen Merkmale. Durch das periodische Auf- und zusteuern des elektronischen Schaltkreises treten an der Reihenschaltung des Widerstands- und Anzeigeelementes sowie an dem Spitzenwertgleichrichter kurze Spannungsimpulse auf, deren Höhe von dem am Widerstandselement eingestellten Widerstandswert abhängt. Durch den Spitzenwertgleichrichter werden diese Spannungsimpulse in eine kontinuierliche Gleichspannung umgewandelt, deren Höhe der Höhe der Spannungsimpulse proportional ist. Durch diese Gleichspannung werden die von dem Komparator an die Drehzahlsteuereinrichtung abgegebenen Impulse und somit die Drehzahl und Leistung des Gebläsemotors beeinflußt. Die kurzen Spannungsimpulse reichen nicht aus, um an dem Anzeigeelement eine Anzeige hervorzurufen. Erst wenn durch den Druckschalter der Kurzschlußkreis für die Reihenschaltung des Widerstands- und Anzeigeelementes unterbrochen ist und dadurch die Gleichspannung kontinuierlich an dem Anzeigeelement anliegt, erfolgt eine Anzeige.The problem is solved by the features specified in claim 1. Due to the periodic opening and closing of the electronic circuit, short voltage pulses occur at the series connection of the resistance and display element and at the peak value rectifier, the magnitude of which depends on the resistance value set on the resistance element. The peak value rectifier converts these voltage pulses into a continuous DC voltage, the level of which is proportional to the level of the voltage pulses. This DC voltage influences the pulses emitted by the comparator to the speed control device and thus the speed and power of the blower motor. The short voltage pulses are not enough to to cause a display on the display element. Only when the short-circuit circuit for the series connection of the resistance and display element is interrupted by the pressure switch and thereby the DC voltage is continuously applied to the display element, is an indication made.

Störeinflüsse auf die Steuereinrichtung infolge von Spannungsschwankungen im Gleichspannungskreis lassen sich dadurch weitgehend vermeiden, daß die Reihenschaltung des Widerstands- und Anzeigeelementes sowie der Spitzenwertgleichrichter über eine Konstantstromquelle mit dem Steuergleichrichter verbunden sind.Interference to the control device due to voltage fluctuations in the DC circuit can be largely avoided by connecting the series connection of the resistance and display element and the peak value rectifier to the control rectifier via a constant current source.

Eine periodische Ansteuerung der Halbleiterschalter wird dadurch erreicht, daß diese gemeinsam an den Steuerausgang eines Operationsverstärkers angeschlossen sind, dessen einer Steuereingang direkt an den einen Pol des als einphasiger Brückengleichrichter ausgebildeten Steuergleichrichters angeschlossen ist und dessen anderer Steuereingang über einen Spannungsteiler an einem über eine Entkoppelungsdiode von dem Steuergleichrichter gespeisten, mit Glättungsmitteln beschalteten Gleichspannungskreis liegt. An dem einen Steuereingang des Operationsverstärkers liegt somit eine pulsierende und an dem anderen Steuereingang eine kontinuierlich verlaufende Gleichspannung an. Solange die Spannung an dem einen Steuereingang niedriger ist als an dem anderen Steuereingang, steht an dem Steuerausgang des Operationsverstärkers ein Sperrsignal für den Halbleiterschalter an. Steigt der Wert der pulsierenden Gleichspannung über den durch den Spannungsteiler vorgegebenen Spannungswert am anderen Steuereingang des Operationsverstärkers an, erscheint am Ausgang des Operationsverstärkers ein Durchsteuersignal für den Halbleiterschalter. Dadurch wird auf einfache Weise das für die periodische Ansteuerung der Halbleiterschalter notwendige Steuersignal erzeugt.A periodic control of the semiconductor switches is achieved in that they are connected together to the control output of an operational amplifier, one control input of which is connected directly to one pole of the control rectifier designed as a single-phase bridge rectifier and the other control input of which is connected to a via a voltage divider via a decoupling diode Control rectifier fed, connected with smoothing DC voltage circuit. A pulsating DC voltage is thus present at one control input of the operational amplifier and a continuous DC voltage is present at the other control input. As long as the voltage at one control input is lower than at the other control input, a blocking signal for the semiconductor switch is present at the control output of the operational amplifier. If the value of the pulsating DC voltage rises above the voltage value specified by the voltage divider at the other control input of the operational amplifier, a control signal for the semiconductor switch appears at the output of the operational amplifier. As a result, the control signal required for the periodic activation of the semiconductor switches is generated in a simple manner.

Dieses periodische Steuersignal kann auch für die Drehzahlsteuerung des Gebläsemotors herangezogen werden, indem der Eingang des anderen Komparators mit dem Ausgang des Operationsverstärkers verbunden ist und zu diesem Eingang des Komparators eine Zenerdiode, ein ohmscher Widerstand und ein Kondensator parallelgeschaltet sind, wobei der Widerstand und der Kondensator dem Eingang des Komparators benachbart geschaltet und durch eine Diode von der Zenerdiode entkoppelt sind. Durch das Steuersignal des Operationsverstärkers wird der Kondensator aufgeladen, wobei durch die Zenerdiode eine Aufladung auf stets gleiche Spannungshöhe vorgegeben ist. Durch die Diode sind der Kondensator und der Widerstand von dem übrigen Kreis entkoppelt, so daß sich der Kondensator nur über den Widerstand entladen kann. Hierdurch wird eine rampenartig verlaufende Spannung erzeugt. Sobald der Wert dieser Spannung unter den Wert der am anderen Eingang des Komparators anliegenden Spannung sinkt, gibt der Komparator ein Steuersignal an die Drehzahlsteuereinrichtung. Dadurch, daß die vom Operationsverstärker abgegebenen Steuerimpulse aus dem Verlauf der gleichgerichteten Netzspannung gewonnen werden, ist bei Steuerung des Komparators durch diese Steuerimpulse die Synchronität des vom Komparator gelieferten Steuersignals zur Netzspannung gegeben.This periodic control signal can also be used for the speed control of the blower motor, in that the input of the other comparator is connected to the output of the operational amplifier and to this input of the comparator a zener diode, an ohmic resistor and a capacitor are connected in parallel, the resistor and the capacitor connected to the input of the comparator and decoupled from the Zener diode by a diode. The capacitor is charged by the control signal of the operational amplifier, charging by the zener diode being always predetermined to the same voltage level. The capacitor and the resistor are decoupled from the rest of the circuit by the diode, so that the capacitor can only discharge through the resistor. This creates a ramp-like voltage. As soon as the value of this voltage drops below the value of the voltage present at the other input of the comparator, the comparator sends a control signal to the speed control device. Because the control pulses emitted by the operational amplifier are obtained from the course of the rectified mains voltage, the control signal supplied by the comparator is synchronized with the mains voltage when the comparator is controlled by these control pulses.

Anhand eines in der Zeichnung dargestellten Ausführungsbeispieles wird der Anmeldungsgegenstand nachfolgend näher beschrieben. Es zeigt:

  • FIG 1 einen Staubsauger mit einer vom Handgriff des Saugschlauches aus betätigbaren Fernsteuereinrichtung,
  • FIG 2 ein Schaltbild einer Fernsteuereinrichtung.
The subject of the application is described in more detail below using an exemplary embodiment shown in the drawing. It shows:
  • 1 shows a vacuum cleaner with a remote control device which can be actuated from the handle of the suction hose,
  • 2 shows a circuit diagram of a remote control device.

Mit 1 ist ein mit einem Saugschlauch 2 verbundener Handgriff bezeichnet. Der Saugschlauch 2 ist an dem Saugstutzen eines Staubsaugergehäuses 3 angeschlossen, das ein Gebläse 4 mit einem Gebläsemotor 5 enthält. Im Staubsaugergehäuse 3 befindet sich ferner eine die Bauteile für die Fernsteuereinrichtung enthaltende Platine 6. Eine zweiadrige, im Saugschlauch eingebettete Steuerleitung 7, führt von der Platine 6 zu dem Handgriff 1. An diesem Handgriff 1 sind ein steuerbares Widerstandselement 8 und eine Leuchtdiode 9 als Anzeigeelement angeordnet und in Reihenschaltung an die zweiadrige Steuerleitung 7 angeschlossen.1 with a handle connected to a suction hose 2 is designated. The suction hose 2 is connected to the suction nozzle of a vacuum cleaner housing 3, which contains a blower 4 with a blower motor 5. In the vacuum cleaner housing 3 there is also a board 6 containing the components for the remote control device. A two-wire control line 7 embedded in the suction hose leads from the board 6 to the handle 1. On this handle 1 there is a controllable resistance element 8 and a light-emitting diode 9 as a display element arranged and connected in series to the two-wire control line 7.

Die Spannungsversorgung der Fernsteuereinrichtung erfolgt über einen von der Netzspannung U gespeisten Transformator 10. Die Sekundärwicklung dieses Transformators 10 speist einen als Steuergleichrichter dienenden einphasigen Brückengleichrichter 11, an dessen Pluspol eine Entkoppelungsdiode 12 mit ihrer Anode angeschlossen ist. Mit der Kathodenseite der Entkoppelungsdiode 12 sind ein Glättungskondensator 13 und eine zu diesem parallelgeschaltete Zenerdiode 14 verbunden. Somit steht auf der Kathodenseite der Entkoppelungsdiode 12 eine kontinuierlich auf konstanter Höhe verlaufende Gleichspannung an, wohingegen der Verlauf der auf der Anodenseite der Entkoppelungsdiode 12 anstehenden Gleichspannung Sinushalbwellen entspricht.The remote control device is supplied with voltage via a transformer 10 fed by the mains voltage U. The secondary winding of this transformer 10 feeds a single-phase bridge rectifier 11 serving as a control rectifier, to the positive pole of which a decoupling diode 12 is connected with its anode. A smoothing capacitor 13 and a Zener diode 14 connected in parallel with it are connected to the cathode side of the decoupling diode 12. Thus, on the cathode side of the decoupling diode 12 there is a DC voltage running continuously at a constant level, whereas the profile of the DC voltage present on the anode side of the decoupling diode 12 corresponds to half-sine waves.

Eine Konstantstromquelle 15 ist mit ihrem Eingang ebenfalls an die Kathodenseite der Entkoppelungsdiode 12, d.h. an den geglätteten Gleichspannungskreis angeschlossen. Mit dem Ausgang der Konstantstromquelle 15 ist die eine Ader und mit dem Minuspol des Brückengleichrichters 11 die andere Ader der Steuerleitung 7 verbunden. An den Ausgang der Konstantstromquelle 15 ist ferner über einen Eingangswiderstand 16 ein Spitzenwertgleichrichter 17 mit seinem Eingang 18 angeschlossen.A constant current source 15 is also connected with its input to the cathode side of the decoupling diode 12, that is to say to the smoothed DC voltage circuit. One wire of the constant current source 15 is connected and the other wire of the control line 7 is connected to the negative pole of the bridge rectifier 11. A peak value rectifier 17 with its input 18 is also connected to the output of the constant current source 15 via an input resistor 16.

Zwischen dem Eingang 18 des Spitzenwertgleichrichters 17 und dem Minuspol des Brückengleichrichters 11 ist ein erster Halbleiterschalter 19 mit seiner Laststrecke geschaltet. Mit seinem Steuereingang liegt dieser erste Halbleiterschalter 19 über einen Steuerwiderstand 20 am Ausgang eines Operationsverstärkers 21. Der Operationsverstärker 21 steuert den ersten Halbleiterschalter 19 periodisch auf und zu. Um periodische Steuerimpulse erzeugen zu können, ist der Operationsverstärker 21 mit seinem einen Steuereingang mit dem Pluspol des Brückengleichrichters 11 verbunden, wobei gegebenenfalls diese Verbindung auch über einen Spannungsteiler erfolgen kann. Der andere Steuereingang des Operationsverstärkers 21 liegt über einen Spannungsteiler 22 an dem geglätteten Gleichspannungskreis (Kathodenseite der Entkoppelungsdiode 12).A first semiconductor switch 19 with its load path is connected between the input 18 of the peak value rectifier 17 and the negative pole of the bridge rectifier 11. With its control input, this first semiconductor switch 19 is connected via a control resistor 20 at the output of an operational amplifier 21. The operational amplifier 21 controls the first semiconductor switch 19 periodically on and off. In order to be able to generate periodic control pulses, the operational amplifier 21 is connected with its one control input to the positive pole of the bridge rectifier 11, this connection possibly also being able to take place via a voltage divider. The other control input of the operational amplifier 21 is connected to the smoothed direct voltage circuit (cathode side of the decoupling diode 12) via a voltage divider 22.

Der Ausgang des Operationsverstärkers 21 ist ferner auch noch an den einen Eingang eines Komparators 23 geführt. Zwischen diesem Eingang und dem Minuspol des Brückengleichrichters 11 sind eine Zenerdiode 24, ein ohmscher Widerstand 25 und ein Kondensator 26 parallel angeschlossen, wobei der Widerstand 25 und der Kondensator 26 durch eine Diode 27 von der Zenerdiode 24 entkoppelt sind. Der andere Eingang des Komparators 23 ist an den Ausgang des Spitzenwertgleichrichters 17 angeschlossen. Der Ausgang des Komparators 23 ist mit der Basis eines im Stromkreis eines Optokopplers 28 angeordnete Steuertransistors 29 verbunden. Durch den Optokoppler 28, der zur Potentialtrennung zwischen der Netzspannung und dem Spannungskreis der Platine 6 dient, wird eine mit dem Gebläsemotor 5 in Reihe liegende Leistungsstufe 30 gesteuert.The output of the operational amplifier 21 is also also led to the one input of a comparator 23. A zener diode 24, an ohmic resistor 25 and a capacitor 26 are connected in parallel between this input and the negative pole of the bridge rectifier 11, the resistor 25 and the capacitor 26 being decoupled from the zener diode 24 by a diode 27. The other input of the comparator 23 is connected to the output of the peak value rectifier 17. The output of the comparator 23 is connected to the base of a control transistor 29 arranged in the circuit of an optocoupler 28. A power stage 30, which is connected in series with the blower motor 5, is controlled by the optocoupler 28, which is used for electrical isolation between the mains voltage and the voltage circuit of the circuit board 6.

Die optische Anzeige eines notwendigen Filterwechsels kann auf zweierlei Art gesteuert werden, je nach dem, ob ein Druckschalter mit einem Öffner oder einem Schließer vorgesehen ist. Wird ein Druckschalter mit einem Öffner 31 verwendet, dann wird die Schaltstrecke dieses Öffners 31 zu dem Eingangswiderstand 16 des Spitzenwertgleichrichters 17 parallelgeschaltet. Steht dagegen ein Druckschalter mit einem Schließer 32 zur Verfügung, dann wird, wie in FIG 2 gestrichelt angedeutet, durch diesen Schließer 32 die Steuerstrecke eines zweiten, mit seiner Laststrecke zu der Reihenschaltung des Widerstands- und Anzeigeelementes 8 und 9 parallelgeschalteten Halbleiterschalters 33 kurzgeschlossen.The visual display of a necessary filter change can be controlled in two ways, depending on whether a pressure switch with an opener or a closer is provided. If a pressure switch with a break contact 31 is used, the switching path of this break contact 31 becomes the input resistor 16 of the peak value rectifier 17 connected in parallel. If, on the other hand, a pressure switch with a make contact 32 is available, then, as indicated by the dashed line in FIG.

Damit ein polaritätsunabhängiger Anschluß der am Handgriff 1 angeordneten Elemente 8 und 9 möglich ist, ist die Leuchtdiode 9 in die Gleichspannungsdiagonale eines Doppelweggleichrichters 34 geschaltet.So that a polarity-independent connection of the elements 8 and 9 arranged on the handle 1 is possible, the light-emitting diode 9 is connected to the direct voltage diagonal of a full-wave rectifier 34.

Die Fernsteuereinrichtung arbeitet wie folgt:The remote control device works as follows:

Durch Verstellen des am Handgriff 1 angeordneten Widerstandselementes 8 wird die Höhe der an der Reihenschaltung dieses Widerstandselementes 8 und der Leuchtdiode 9 abfallenden Spannung verändert. Über den Eingangswiderstand 16 liegt diese Spannung jeweils dann am Eingang 18 des Spitzenwertgleichrichters 17 an, wenn der erste Halbleiterschalter 19 gesperrt ist. Wie bereits erwähnt, wird der erste Halbleiterschalter 19 durch den Operationsverstärker 21 periodisch auf- und zugesteuert.By adjusting the resistance element 8 arranged on the handle 1, the level of the voltage drop across the series connection of this resistance element 8 and the light-emitting diode 9 is changed. Via the input resistor 16, this voltage is present at the input 18 of the peak value rectifier 17 when the first semiconductor switch 19 is blocked. As already mentioned, the first semiconductor switch 19 is periodically opened and closed by the operational amplifier 21.

Die periodische Folge der Steuerimpulse des Operationsverstärkers 21 kommt dadurch zustande, daß an dem einen Eingang des Operationsverstärkers 21 die in Form von Sinushalbwellen pulsierende Gleichspannung des Brückengleichrichters 11 und an dem anderen Eingang des Operationsverstärkers 21 die auf der Kathodenseite der Entkoppelungsdiode 12 herrschende kontinuierliche Gleichspannung angelegt ist. Durch den Spannungsteiler 22 kann ein entsprechender Ansprechwert für den Operationsverstärker 21 vorgegeben werden. Am Ausgang des Operationsverstärkers 21 steht jeweils dann ein Sperrsignal für den ersten Halbleiterschalter 19 an, wenn die an dem einen Steuer eingang liegende sinusförmig verlaufende Spannung niedriger ist als die an dem anderen Steuereingang anliegende kontinuierliche Gleichspannung. Steigt die sinusförmig verlaufende Spannung über den Wert der am anderen Eingang anliegenden kontinuierlichen Gleichspannung an, dann erscheint am Ausgang des Operationsverstärkers 21 ein Durchsteuersignal für den ersten Halbleiterschalter 19. Der Halbleiterschalter 19 wird somit synchron zur Netzspannung U auf- und zugesteuert.The periodic sequence of the control pulses of the operational amplifier 21 arises from the fact that the DC voltage of the bridge rectifier 11 pulsating in the form of sine half-waves is applied to one input of the operational amplifier 21 and the continuous DC voltage prevailing on the cathode side of the decoupling diode 12 is applied to the other input of the operational amplifier 21 . A corresponding response value for the operational amplifier 21 can be predetermined by the voltage divider 22. At the output of the operational amplifier 21 there is a blocking signal for the first semiconductor switch 19 when the one control input sinusoidal voltage is lower than the continuous DC voltage applied to the other control input. If the sinusoidal voltage rises above the value of the continuous DC voltage present at the other input, a control signal for the first semiconductor switch 19 appears at the output of the operational amplifier 21. The semiconductor switch 19 is thus switched on and off in synchronism with the mains voltage U.

Der während der Sperrung des ersten Halbleiterschalters 19 am Eingang 18 des Spitzenwertgleichrichters 17 anstehende Spannungsimpuls ruft am Ausgang des Spitzenwertgleichrichters 17 eine kontinuierliche Gleichspannung hervor, deren Höhe von der Höhe des Spannungsimpulses abhängt. Damit ist die am Ausgang des Spitzenwertgleichrichters 17 erscheinende Gleichspannung dem durch das Widerstandselement 8 eingestellten Spannungsabfall proportional.The voltage pulse present at the input 18 of the peak value rectifier 17 during the blocking of the first semiconductor switch 19 causes a continuous DC voltage at the output of the peak value rectifier 17, the level of which depends on the level of the voltage pulse. The DC voltage appearing at the output of the peak value rectifier 17 is thus proportional to the voltage drop set by the resistance element 8.

Da die an dem einen Eingang des Operationsverstärkers 21 anliegende sinusförmig verlaufende Spannung nur während einer kurzen Zeitspanne kleiner als die am anderen Eingang des Operationsverstärkes 21 anliegende kontinuierliche Gleichspannung ist, wird der erste Halbleiterschalter 19 nur für eine entsprechend kurze Zeit gesperrt. Während der übrigen Zeit der Sinushalbwelle ist der erste Halbleiterschalter 19 durchgesteuert und schließt somit über den Öffner 31 des Druckschalters die Reihenschaltung des Widerstandselementes 8 und der Leuchtdiode 9 kurz. Die Leuchtdiode bleibt damit dunkel, da der kurze Spannungsimpuls während der Sperrzeit des ersten Halbleiterschalters 19 nicht ausreicht, um die Leuchtdiode 9 zu einem wahrnehmbaren Aufleuchten zu bringen.Since the sinusoidal voltage applied to one input of the operational amplifier 21 is only smaller than the continuous direct voltage applied to the other input of the operational amplifier 21 for a short period of time, the first semiconductor switch 19 is only blocked for a correspondingly short time. During the rest of the sine half-wave, the first semiconductor switch 19 is turned on and thus short-circuits the series connection of the resistance element 8 and the light-emitting diode 9 via the break contact 31 of the pressure switch. The light-emitting diode thus remains dark, since the short voltage pulse during the blocking time of the first semiconductor switch 19 is not sufficient to make the light-emitting diode 9 perceptibly light up.

Spricht der Druckschalter bei einem bestimmten Füllungsgrad des Filterbeutels an, dann wird durch den Öffner 31 der Kurzschlußkreis für die Reihenschaltung des Widerstandselementes 8 und der Leuchtdiode 9 unterbrochen. Die Leuchtdiode 9 erhält nunmehr eine zum Aufleuchten ausreichenden Strom und signalisiert dadurch einen notwendigen Filterwechsel.If the pressure switch responds at a certain filling level of the filter bag, then the short-circuit circuit for the series connection of the resistance element 8 is opened by the opener 31 and the LED 9 interrupted. The light-emitting diode 9 now receives a current sufficient to light up and thereby signals a necessary filter change.

Unabhängig von der Anzeige oder Nichtanzeige der Leuchtdiode 9 ist die Leistungsregelung des Gebläsemotors möglich. Wie oben erwähnt, werden die durch das Auf- und Zusteuern des ersten Halbleiterschalters 19 am Eingang 18 des Spitzenwertgleichrichters 17 erzeugten Spannungsimpulse in eine kontinuierliche Gleichspannung mit proportionaler Amplitude umgewandelt. Diese dem durch das Widerstandselement 8 eingestellten Spannungsabfall proportinale Gleichspannung wird dem einen Eingang des Komparators 23 zugeführt. In diesem Komparator 23 erfolgt ein Vergleich der kontinuierlichen, in ihrer Höhe durch Vestellen des Widerstandselementes 8 veränderbaren Gleichspannung mit der am anderen Eingang anliegenden rampenförmig verlaufenden Spannung.Regardless of the display or non-display of the LED 9, the power control of the blower motor is possible. As mentioned above, the voltage pulses generated by the opening and closing of the first semiconductor switch 19 at the input 18 of the peak value rectifier 17 are converted into a continuous DC voltage with a proportional amplitude. This DC voltage, which is proportional to the voltage drop set by the resistance element 8, is fed to one input of the comparator 23. In this comparator 23 there is a comparison of the continuous DC voltage, the level of which can be changed by resetting the resistance element 8, with the ramp-shaped voltage present at the other input.

Diese rampenförmige Spannung entsteht dadurch, daß der Kondensator 26 durch einen positiven Steuerimpuls des Operationsverstärkers 21 aufgeladen wird. Durch die vorgeschaltete Zehnerdiode 24 wird die Aufladung des Kondensators 26 auf eine konstante Spannungshöhe begrenzt. Nach Verschwinden des positiven Steuerimpulses beginnt sich der Kondensator 26 über den Ohm'schen Widerstand 25 zu entladen, wobei der Entladekreis durch die Diode 27 von dem übrigen Kreis entkoppelt ist. Durch die Entladung des Kondensators 26 sinkt die an dem betreffenden Steuereingang des Komparators 23 anliegende Spannung ab. Sobald diese Spannung die Höhe der am anderen Steuereingang anliegenden Spannung unterschreitet, gibt der Komparator 23 ein Steuersignal ab, durch das der Steuertransistor 29 durchgesteuert und dadurch der Optokoppler 28 aktiviert wird, der seinerseits die Leistungsstufe 30 des Gebläsemotors 5 entsprechend steuert.This ramp-shaped voltage arises from the fact that the capacitor 26 is charged by a positive control pulse from the operational amplifier 21. The upstream diode 24 limits the charging of the capacitor 26 to a constant voltage level. After the disappearance of the positive control pulse, the capacitor 26 begins to discharge via the ohmic resistor 25, the discharge circuit being decoupled from the rest of the circuit by the diode 27. Due to the discharge of the capacitor 26, the voltage present at the relevant control input of the comparator 23 drops. As soon as this voltage drops below the level of the voltage present at the other control input, the comparator 23 emits a control signal by which the control transistor 29 is turned on and thereby activates the optocoupler 28, which in turn controls the power stage 30 of the blower motor 5 accordingly.

Da die durch die Entladung des Kondensators 26 gelieferte rampenförmig verlaufende Spannung in ihrer Größe konstant ist, wird durch ein Verändern der am anderen Steuereingang des Komparators anliegenden kontinuierlichen Gleichspannung die Phasenlage des von dem Komparators 23 abgegebenen Steuersignals und damit entsprechend die Leistungssteuerung des Gebläsemotors 5 verändert.Since the ramp-shaped voltage supplied by the discharge of the capacitor 26 is constant in magnitude, the phase position of the control signal emitted by the comparator 23 and thus the power control of the blower motor 5 are changed accordingly by changing the continuous DC voltage present at the other control input of the comparator.

Wird anstelle eines Druckschalters mit einem Öffner 31 ein Druckschalter mit einem Schließer 32 verwendet, so ist eine Abwandlung der Schaltung notwendig. Zum Kurzschließen der von dem Widerstandselement 8 und der Leuchtdiode 9 gebildeten Reihenschaltung ist in diesem Falle ein zweiter Halbleiterschalter 33 vorgesehen, der mit seiner Laststrecke (Kollektor-Emitter-Strecke) zu der Reihenschaltung parallelgeschaltet ist. Durch den Schließer 32 des Druckschalters wird die Steuerstrecke (Basis-Emitter-Strecke) des zweiten Halbleiterschaltelementes 33 kurzgeschlossen und dadurch der zweite Halbleiterschalter 33 dauernd gesperrt. Damit erhält die Leuchtdiode 9 eine zum Aufleuchten ausreichende Stromdauer.If a pressure switch with a closer 32 is used instead of a pressure switch with an opener 31, then a modification of the circuit is necessary. To short-circuit the series circuit formed by the resistance element 8 and the light-emitting diode 9, a second semiconductor switch 33 is provided in this case, which is connected in parallel with the series circuit with its load path (collector-emitter path). The control path (base-emitter path) of the second semiconductor switching element 33 is short-circuited by the make contact 32 of the pressure switch, and the second semiconductor switch 33 is thereby permanently blocked. The light-emitting diode 9 thus has a current duration sufficient for lighting up.

Solange der Druckschalter noch nicht angesprochen hat, der Schließer 32 also geöffnet ist, wird der zweite Halbleiterschalter 33 über den seiner Basis vorgeschalteten Basiswiderstand 35 durch den Operationsverstärker 21 periodisch auf- und zugesteuert. Hierbei reicht die entsprechend kurz bemessene Sperrphase des zweiten Halbleiterschalters 33 nicht aus, um ein Aufleuchten der Leuchtdiode 9 zu bewirken. Der erste Halbleiterschalter 19 wird bei dieser Ausführungsvariante parallel zu dem zweiten Halbleiterschalter 33 von dem Operationsverstärker 21 angesteuert und es werden somit die für den Spitzenwertgleichrichter 17 notwendigen Spannungsimpulse erzeugt. Auch nach dem Ansprechen des Druckschalters und dem dadurch bewirkten Sperren des zweiten Halbleiterschalters 33 bleibt die periodische Steuerung des ersten Halbleiterschalters 19 erhalten, so daß weiterhin die Leistung des Gebläsemotors 5 durch Verstellen des Widerstandselementes 8 gesteuert werden kann.As long as the pressure switch has not yet responded, ie the make contact 32 is open, the second semiconductor switch 33 is periodically opened and closed by the operational amplifier 21 via the base resistor 35 connected upstream of its base. The correspondingly short blocking phase of the second semiconductor switch 33 is not sufficient to cause the light emitting diode 9 to light up. In this embodiment variant, the first semiconductor switch 19 is driven in parallel with the second semiconductor switch 33 by the operational amplifier 21, and the voltage pulses necessary for the peak value rectifier 17 are thus generated. Even after the pressure switch has responded and as a result caused blocking of the second semiconductor switch 33, the periodic control of the first semiconductor switch 19 is maintained, so that the performance of the blower motor 5 can still be controlled by adjusting the resistance element 8.

Die beschriebene Fernsteuereinrichtung kommt somit für die Leistungssteuerung des Gebläsemotors 5 vom Handgriff 1 aus und die gleichzeitige Anzeige eines notwendigen Filterwechsels am Handgriff 1 mit einer zweiadrigen Steuerleitung 7 aus.The remote control device described thus comes from the handle 1 for the power control of the blower motor 5 and the simultaneous display of a necessary filter change on the handle 1 with a two-wire control line 7.

Claims (6)

1. Device for the remote control of the blower motor of a vacuum cleaner from the handle of the suction hose, in which an adjustable resistance element (8) is arranged on the handle (1) and is in operative connection with the speed control device of the blower motor (5) by means of a two-wire control line (7) extending along the suction hose (2), in which device
a) an electrical display element (9) likewise arranged on the handle (1) is connected in series with the resistance element (8) and this series connection is connected by means of the control line (7) to the direct voltage output of a control rectifier (11) arranged in the vacuum cleaner housing (3);
b) by means of an electronic switching circuit (19, 33) periodically opened and closed controlled by an electronic control element (21), both the series connection of the resistance element and display element (8, 9) as well as a peak value rectifier (17) connected by means of an input resistance (16) to the positive pole of the control rectifier (11) can be short-circuited periodically;
c) the shorted circuit for the series connection of the resistance element and the display element (8, 9) can be disconnected by means of a pressure switch (31, 32) starting in dependence upon the degree of filling of the filter bag;
d) the output of the peak value rectifier (17) is connected to the one input of a comparator (23), to the other input of which there is supplied a periodical signal of constant magnitude, extending in a ramp-like manner, and the output of which is connected to the control input of the speed control device (30).
2. Device according to claim 1, in which the series connection of the resistance element and display element (8, 9) as well as the peak value rectifier (17) are connected by means of a constant current source (15) to the positive pole of the control rectifier (11).
3. Device according to claim 1 or 2, in which with a pressure switch constructed as an opener (31) the switching path of the pressure switch is connected in parallel with the input resistance (16) of the peak value rectifier (17) and this parallel connection is connected by means of a first semi-conductor switch (19), which is controlled to be periodically open and closed, to the negative pole of the control rectifier (11).
4. Device according to claim 1 or 2, in which with a pressure switch constructed as a contact (32) the control path of a second semi-conductor switch (33) can be short-circuited by means of the closing contact of the pressure switch, the semi-conductor switch with its load path lying in parallel with the series connection of the resistance element and display element (8, 9), and that connected with its load path between the input (18) of the peak value rectifier (17) and the negative pole of the control rectifier (11) is a first semi-conductor switch (19) controlled synchronously to the second semi-conductor switch (33).
5. Device according to claim 4, in which both semi-conductor switches (19, 33) are attached together to the control output of an operational amplifier (21), the one control input of which is attached directly to the one pole (+) of the control rectifier constructed as single-phase bridge rectifier (11), and the other control input of which is connected by means of a voltage divider (22) to a direct voltage circuit fed by means of a decoupling diode (12) by the bridge rectifier (11) and connected to smoothing means (13, 14).
6. Device according to one or several of the preceding claims, in which the other input of the comparator (23) is connected to the output of the operational amplifier (21) and to this input of the comparator (23) a Zener diode (24), an ohmic resistance (25) and a capacitor (26) are connected in parallel, whereby the resistance (25) and the capacitor (26) are connected adjacent to the input of the comparator (23) and are decoupled by a diode (27) from the Zener diode (24).
EP88103022A 1987-03-11 1988-02-29 Device for remote control of a vacuum cleaner blowing motor from the handle of the suction hose Expired - Lifetime EP0285801B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88103022T ATE61921T1 (en) 1987-03-11 1988-02-29 DEVICE FOR REMOTE CONTROL OF THE BLOWER MOTOR OF A VACUUM CLEANER FROM THE HANDLE OF THE SUCTION HOSE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3707834 1987-03-11
DE3707834 1987-03-11

Publications (2)

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EP0285801A1 EP0285801A1 (en) 1988-10-12
EP0285801B1 true EP0285801B1 (en) 1991-03-27

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EP88103022A Expired - Lifetime EP0285801B1 (en) 1987-03-11 1988-02-29 Device for remote control of a vacuum cleaner blowing motor from the handle of the suction hose

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EP (1) EP0285801B1 (en)
AT (1) ATE61921T1 (en)
DE (1) DE3862137D1 (en)
DK (1) DK125288A (en)
FI (1) FI84877C (en)
NO (1) NO881097L (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2547630B2 (en) * 1988-12-19 1996-10-23 三洋電機株式会社 Electric vacuum cleaner
SE463071B (en) * 1989-02-14 1990-10-08 Electrolux Ab DEVICE BY A LIFT CLEANER
FR2686721B1 (en) * 1992-01-28 1994-04-29 Hoover ULTRASONIC REMOTE CONTROL DEVICE FOR VACUUM CLEANER.
US5507067A (en) * 1994-05-12 1996-04-16 Newtronics Pty Ltd. Electronic vacuum cleaner control system
WO1996025788A1 (en) * 1995-02-16 1996-08-22 Philips Electronics N.V. Device for converting a resistance value into a control signal which depends on the resistance value, and electrical apparatus comprising such a device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3117507C2 (en) * 1981-03-12 1984-08-30 Gerhard 7262 Althengstett Kurz Device for the automatic suction power control of a vacuum cleaner
DE3473729D1 (en) * 1983-02-12 1988-10-06 Matsushita Electric Ind Co Ltd Electric vacuum cleaner
DE3313700C2 (en) * 1983-04-15 1985-04-25 Gerhard 7262 Althengstett Kurz Device for manual, pneumatic actuation of a vacuum cleaner with an electric motor
DE3431164A1 (en) * 1984-02-08 1985-08-14 Gerhard 7262 Althengstett Kurz VACUUM CLEANER

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DE3862137D1 (en) 1991-05-02
NO881097L (en) 1988-09-12
DK125288A (en) 1988-09-12
FI84877B (en) 1991-10-31
ATE61921T1 (en) 1991-04-15
DK125288D0 (en) 1988-03-09
FI874941A (en) 1988-09-12
NO881097D0 (en) 1988-03-11
FI84877C (en) 1992-02-10
EP0285801A1 (en) 1988-10-12
FI874941A0 (en) 1987-11-09

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