EP0678271B1 - Circuit for controlling the suction capacity of a vacuum cleaner - Google Patents

Circuit for controlling the suction capacity of a vacuum cleaner Download PDF

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Publication number
EP0678271B1
EP0678271B1 EP95105303A EP95105303A EP0678271B1 EP 0678271 B1 EP0678271 B1 EP 0678271B1 EP 95105303 A EP95105303 A EP 95105303A EP 95105303 A EP95105303 A EP 95105303A EP 0678271 B1 EP0678271 B1 EP 0678271B1
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EP
European Patent Office
Prior art keywords
control
control signal
circuit arrangement
circuit
arrangement according
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.)
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EP95105303A
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German (de)
French (fr)
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EP0678271A3 (en
EP0678271A2 (en
Inventor
Ehrenhardt Dipl.-Ing. Kaupa (Fh)
Elmar Dipl.-Ing. Freund (Fh)
Herbert Seufert
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BSH Hausgeraete GmbH
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BSH Bosch und Siemens Hausgeraete GmbH
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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
    • A47L9/2857—User input or output elements for control, e.g. buttons, switches or displays
    • 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

Definitions

  • the invention relates to a circuit arrangement for suction power control a vacuum cleaner
  • DE-C-39 02 647 is an automatic device Suction power control of a vacuum cleaner known. At this device are two at different pressures responsive pressure switches provided, the switching pulses in corresponding to a connected control circuit Trigger functions. Because of the two pressure switches there is a "directional dependence" of the device, i.e. around to ensure proper functioning of the device, it must be at a lower and that at a higher pressure responsive pressure switches at a specific point the control circuit can be connected. It comes with the Assembly of the device to confuse this Connection options, then the device is inoperable. The use of two pressure switches also means an increased cost of materials.
  • the invention has for its object a circuit arrangement to control the suction power of a vacuum cleaner train that only one pressure switch is required and thus achieved an easier assembly and also a Inoperability of the circuit arrangement by Incorrect assembly is avoided.
  • This task is in a circuit arrangement according to the Claim 1 solved.
  • the control signal can be adjusted by hand of a potentiometer can be changed, whereby one constant power corresponding to the potentiometer setting of the blower motor is specified.
  • automatic Control can be changed by the pressure switch. Through the corresponding to the respective pressure conditions Opening and closing the pressure switch is between two for the control signal predetermined voltage values back and forth switched here, so that in the manner of a two-point control Blower motor is controlled in its output so that a constant or at least approximately constant vacuum is produced.
  • the comparator consists of one There is operational amplifier, at one input an sawtooth voltage synchronized with the mains voltage of the blower motor lies and at the other input the control signal is fed.
  • the network synchronous Sawtooth voltage with the control signal can be controlled by a Change the control signal in a simple way flawless, the performance of the blower motor accordingly changing control of the semiconductor switching element to reach.
  • Low-noise ignition pulses for the controllable semiconductor switching elements can be generated by the output of the operational amplifier via a differentiator with the an input of a comparator is connected to the other input has a fixed reference voltage.
  • the control signal can be operated manually Potentiometer or on the other hand using one to one Resistance of pressure switch connected in parallel changed become. In the latter case, there is an automatic Regulation of the negative pressure. Because of the respective negative pressure dependent opening or closing of the pressure switch the parallel resistor either on or off, so that the control signal between two voltage values commutes. Accordingly, the performance of the Blower motor increased or decreased, so that on average a constant or at least approximately constant negative pressure sets.
  • a switch can advantageously be provided with between manual adjustment using the potentiometer and automatic vacuum control can be switched can.
  • the power control of the blower motor is expedient due to additional resistances in the control signal circuit minimum and a maximum value limited.
  • the blower motor starts gently after switching on achieved in a simple manner in that by means of a series RC element an additional signal in the feed connector of the Control signal is fed to the comparator.
  • This member controlling the semiconductor switching element 2 is like can be seen from FIG 2, a control transistor 9, the Base 10 via a first control line 11 with the Ignition pulse part 8 is connected.
  • the power section 4 contains also a circuit part 12 for generating a DC supply voltage.
  • the circuit part 12 points to this a series RC element 13 to which two diodes 14 lie antiparallel in row.
  • the two diodes 14 are with their other connection side to one pole each Smoothing capacitor 15 connected.
  • To that Smoothing capacitor 15 is also a Zener diode 16 for Voltage stabilization connected in parallel.
  • the most Smoothing capacitor 15 applied voltage represents the DC supply voltage for the circuit arrangement.
  • the power section 4 also contains one at the supply voltage of the blower motor 1 lying first voltage divider 17, at the tap of a filter capacitor 18 with its a connection pole is connected. Through this filter capacitor 18 may be in the divided AC voltage contained DC voltage components suppressed. On the other connection pole 19 of the filter capacitor 18 is the Synchronous part 5 connected.
  • the synchronizing part 5 has one of a first and a second Operational amplifier 20 and 21 existing window comparator on.
  • the AC voltage supplied by the filter capacitor 18 is to the inverting input of the first Operational amplifier 20 and on the non-inverting Input of the second operational amplifier 21 placed.
  • With the two operational amplifiers are located at their other inputs 20 and 21 via divider resistors 22 on the DC supply voltage.
  • switched Window comparators occur at every zero crossing AC voltage present at its output 23 narrow Rectangular pulses. Through these impulses one becomes with his Collector-emitter path to a via a series resistor 24 connected to the DC supply voltage Capacitor 25 charging transistor 26 connected in parallel controlled.
  • controlled discharge transistor 26 becomes the capacitor 25 periodically over a lying in the collector-emitter circuit Discharge resistor 27 discharge. During the blocking period of the Discharge transistor 26 is charged again in each case Capacitor 25. This creates a sawtooth voltage educated. This sawtooth-shaped voltage is on the inverting input of a comparator Operational amplifier 28 placed. The non-inverting Input of this operational amplifier 28 is via a second Control line 29 is supplied with a control signal.
  • a differentiator 31 is connected, whose output 32 with the inverting input one Comparator 33 is connected to its non-inverting Input by means of a second voltage divider 34 a Reference voltage is set.
  • the output 35 of the comparator 33 is connected via the first control line 11 to the base 10 of the Control transistor 9 connected.
  • the control section 7 (FIG 4) contains a third voltage divider 36, at the tap 37 a potentiometer 38 and the Parallel connection of a control resistor 39 with a Pressure switch 40 is connected.
  • the one from the control resistor 39 and the pressure switch 40 existing parallel connection is also connected to ground via a control RC element 41.
  • Via a switch 42 the tap of the Potentiometer 38 or the common connection point 43 of the Control resistor 39 and the pressure switch 40 with the Control RC element 41 via a connection resistor 44 to the Control line 29 are switched.
  • a limiting resistor 45 connected with its one connection pole, whose other terminal is connected to ground. With the control line 29 an additional control part 46 is connected.
  • This additional control part 46 contains a series RC element 47 and one of a fixed resistor 48 and a PTC resistor 51 existing voltage dividers.
  • the tap of the series RC link 47 and the voltage divider is in each case one Decoupling diode 49 or 50 with the control line 29 connected.
  • the circuit arrangement works as follows: If the vacuum cleaner is switched to the mains voltage by means of a switch (not shown), then the required DC supply voltage is provided via the circuit part 12. Via the first voltage divider 17 and the filter capacitor 18, an AC voltage which is lower than the mains voltage but is synchronous with it is available. As already described, a sawtooth voltage which is synchronous with the AC voltage is generated by means of the window comparators 20 and 21 and the discharge transistor 26 controlled by them by correspondingly charging and discharging the capacitor 25. A "high" signal is generated at the output 30 of this operational amplifier 28 by this sawtooth voltage at the inverting input of the operational amplifier 28 acting as a comparator.
  • This "high” signal remains until the sawtooth voltage reaches the value of the control signal present at the non-inverting input of this operational amplifier 28. At this moment, the output signal of the operational amplifier 28 changes to "low". As a result of this signal change, the differentiator 31 generates a narrow needle pulse.
  • the needle pulses emanating from the differentiating element 31 are converted by the comparator 33 into corresponding narrow rectangular pulses, which represent the control pulses for the control transistor 9 and are supplied to the base 10 of the control transistor 9 via the first control line 11.
  • the control transistor 9 is turned on for the duration of such a rectangular pulse and thus fires the semiconductor switching element 2 each time.
  • That of the operational amplifier 28 acting as a comparator supplied control signal can be adjusted in different ways or be specified.
  • the setting of this control signal can be done by hand using the potentiometer 38 become.
  • the blower motor 1 is defined Power controlled as a result of being fixed by the potentiometer 38 predetermined control signals on the acting as a comparator Operational amplifier 28 always at the same phase the sawtooth voltage the signal switching at its output 30 takes place.
  • the semiconductor switching element 2 always with the same potentiometer setting corresponding phase angle ignited.
  • the switch 42 in its other switching position and switched to the common connection point 43, so the control signal is now specified by the Pressure switch 40 and the control resistor 39.
  • the response pressure of the pressure switch 40 is reached, this closes.
  • the Control resistor 39 bridges and the voltage of the control signal elevated. This leads to a later ignition of the Semiconductor switching element 2, so that the motor power drops.
  • the pressure switch 40 opens again and thus switches the control resistor 39 a.
  • control part 7 is due to the resistance part connected to ground of the third voltage divider 36 is a minimum value the voltage on the blower motor.
  • the limit on a maximum value of the motor voltage is given by the Limiting resistance 45.
  • the additional control part 46 still a starting current limitation and causes overtemperature protection.
  • For starting current limitation serves the series RC element 47 of the control part 46.
  • About the capacitor of this series RC element 47 is in Switch-on instant of the vacuum cleaner the voltage of the control signal raised so that the firing angle of the semiconductor switching element increases and thus the starting current is reduced.
  • the voltage of the Control signal With progressive charging of the capacitor of the series RC element 47, the voltage of the Control signal, which is a reduction in the ignition angle of the Semiconductor switching element 2 and thus an increase in Engine performance.
  • Overload protection is provided by a fixed resistor 48 and a PTC resistor 51 existing voltage divider of the Control part 46 reached. With appropriate heating of the Blower motor 1, the resistance of the PTC resistor 51 rises on. Reaches the voltage at the tap of this voltage divider 48; 51 a higher value than the voltage of the second Control line 29 pending control signal is via the Decoupling diode 50 this higher voltage in the second Control line 29 effective. This leads over to the comparator acting operational amplifier 28 and this downstream controls to enlarge the Firing angle of the semiconductor switching element 2 and thus too a reduction in the power of the blower motor 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electric Vacuum Cleaner (AREA)
  • Control Of Ac Motors In General (AREA)

Description

Die Erfindung betrifft eine Schaltungsanordnung zur Saugleistungsregelung eines StaubsaugersThe invention relates to a circuit arrangement for suction power control a vacuum cleaner

Durch die DE-C-39 02 647 ist eine Vorrichtung zur automatischen Saugleistungsregelung eines Staubsaugers bekannt. Bei dieser Vorrichtung sind zwei auf unterschiedliche Drücke ansprechende Druckschalter vorgesehen, deren Schaltimpulse in einer angeschlossenen Ansteuerschaltung entsprechende Funktionen auslösen. Wegen der beiden Druckschalter ergibt sich eine "Richtungsabhängigkeit" der Vorrichtung, d.h. um eine einwandfreie Funktion der Vorrichtung zu gewahrleisten, muß der auf einen niederen und der auf einen höheren Druck ansprechende Druckschalter jeweils an einer bestimmten Stelle der Ansteuerschaltung angeschlossen werden. Kommt es bei der Montage der Vorrichtung zu einer Verwechslung dieser Anschlußmöglichkeiten, dann ist die Vorrichtung funktionsunfähig. Der Einsatz von zwei Druckschaltern bedeutet außerdem einen erhöhten Materialaufwand.DE-C-39 02 647 is an automatic device Suction power control of a vacuum cleaner known. At this device are two at different pressures responsive pressure switches provided, the switching pulses in corresponding to a connected control circuit Trigger functions. Because of the two pressure switches there is a "directional dependence" of the device, i.e. around to ensure proper functioning of the device, it must be at a lower and that at a higher pressure responsive pressure switches at a specific point the control circuit can be connected. It comes with the Assembly of the device to confuse this Connection options, then the device is inoperable. The use of two pressure switches also means an increased cost of materials.

Der Erfindung liegt die Aufgabe zugrunde, eine Schaltungsanordnung zur Saugleistungsregelung eines Staubsaugers so auszubilden, daß nur ein Druckschalter benötigt und somit eine einfachere Montage erreicht und ferner eine Funktionsunfähigkeit der Schaltungsanordnung durch eine Fehlmontage vermieden wird.The invention has for its object a circuit arrangement to control the suction power of a vacuum cleaner train that only one pressure switch is required and thus achieved an easier assembly and also a Inoperability of the circuit arrangement by Incorrect assembly is avoided.

Diese Aufgabe ist bei einer Schaltungsanordnung gemäß dem Anspruch 1 gelöst. Die entsprechend dem Vergleich des periodisch veränderlichen Signals mit dem Steuersignal für das Halbleiterschaltelement gebildeten Steuerimpulse können durch eine Veränderung des Steuersignals entsprechend gesteuert werden. Dabei kann das Steuersignal von Hand durch Verstellen eines Potentiometers verändert werden, wodurch jeweils eine der Potentiometerstellung entsprechende konstante Leistung des Gebläsemotors vorgegeben wird. Wahlweise kann auf automatische Steuerung durch den Druckschalter umgestellt werden. Durch das den jeweiligen Druckverhältnissen entsprechende Öffnen und Schließen des Druckschalters wird zwischen zwei für das Steuersignal vorgegebenen Spannungswerten hin- und hergeschaltet, so daß nach Art einer Zweipunktregelung der Gebläsemotor in seiner Leistung jeweils so gesteuert wird, daß ein konstanter oder zumindest annähernd konstanter Unterdruck erzeugt wird.This task is in a circuit arrangement according to the Claim 1 solved. The according to the comparison of the periodically variable signal with the control signal for that Semiconductor switching element formed by control pulses controlled a change in the control signal accordingly become. The control signal can be adjusted by hand of a potentiometer can be changed, whereby one constant power corresponding to the potentiometer setting of the blower motor is specified. Optionally, automatic Control can be changed by the pressure switch. Through the corresponding to the respective pressure conditions Opening and closing the pressure switch is between two for the control signal predetermined voltage values back and forth switched here, so that in the manner of a two-point control Blower motor is controlled in its output so that a constant or at least approximately constant vacuum is produced.

Besonders vorteilhaft ist es, wenn der Vergleicher aus einem Operationsverstärker besteht, an dessen einem Eingang eine mit der Netzspannung des Gebläsemotors synchronisierte Sägezahnspannung liegt und an dessen anderem Eingang das Steuersignal zugeführt ist. Durch den Vergleich der netzsynchronen Sägezahnspannung mit dem Steuersignal läßt sich durch eine Veränderung des Steuersignals auf einfache Weise eine einwandfreie, die Leistung des Gebläsemotors entsprechend verändernde Ansteuerung des Halbleiterschaltelementes erreichen.It is particularly advantageous if the comparator consists of one There is operational amplifier, at one input an sawtooth voltage synchronized with the mains voltage of the blower motor lies and at the other input the control signal is fed. By comparing the network synchronous Sawtooth voltage with the control signal can be controlled by a Change the control signal in a simple way flawless, the performance of the blower motor accordingly changing control of the semiconductor switching element to reach.

Störungsarme Zündimpulse für die steuerbaren Halbleiterschaltelemente lassen sich dadurch erzeugen, daß der Ausgang des Operationsverstärkers über ein Differenzierglied mit dem einen Eingang eines Komparators verbunden ist, an dessen anderem Eingang eine feste Vergleichsspannung liegt.Low-noise ignition pulses for the controllable semiconductor switching elements can be generated by the output of the operational amplifier via a differentiator with the an input of a comparator is connected to the other input has a fixed reference voltage.

Das Steuersignal kann einerseits durch ein von Hand betätigbares Potentiometer oder andererseits mittels eines zu einem Widerstand parallel geschalteten Druckschalters verändert werden. Im letzteren Fall ergibt sich eine selbsttätige Regelung des Unterdruckes. Durch das vom jeweiligen Unterdruck abhängige Öffnen oder Schließen des Druckschalters wird der parallelliegende Widerstand entweder ein- oder ausgeschaltet, so daß das Steuersignal zwischen zwei Spannungswerten pendelt. Dementsprechend wird die Leistung des Gebläsemotors erhöht oder erniedrigt, so daß sich im Mittel ein konstanter oder zumindest annähernd konstanter Unterdruck einstellt.The control signal can be operated manually Potentiometer or on the other hand using one to one Resistance of pressure switch connected in parallel changed become. In the latter case, there is an automatic Regulation of the negative pressure. Because of the respective negative pressure dependent opening or closing of the pressure switch the parallel resistor either on or off, so that the control signal between two voltage values commutes. Accordingly, the performance of the Blower motor increased or decreased, so that on average a constant or at least approximately constant negative pressure sets.

Vorteilhafterweise kann ein Umschalter vorgesehen sein, mit dem zwischen der Handeinstellung mittels Potentiometer und der automatischen Unterdruckregelung umgeschaltet werden kann.A switch can advantageously be provided with between manual adjustment using the potentiometer and automatic vacuum control can be switched can.

Zweckmäßigerweise wird die Leistungssteuerung des Gebläsemotors durch Zusatzwiderstände im Steuersignalkreis auf einen minimalen und einen maximalen Wert begrenzt.The power control of the blower motor is expedient due to additional resistances in the control signal circuit minimum and a maximum value limited.

Ein Sanftanlauf des Gebläsemotors nach dem Einschalten wird auf einfache Weise dadurch erzielt, daß mittels eines Reihen-RC-Gliedes ein Zusatzsignal in den Zuführungsanschluß des Steuersignals zum Vergleicher eingespeist ist.The blower motor starts gently after switching on achieved in a simple manner in that by means of a series RC element an additional signal in the feed connector of the Control signal is fed to the comparator.

Die Integration eines Überlastschutzes für den Gebläsemotor in die Schaltungsanordnung ist dadurch möglich, daß mittels eines aus einem Festwiderstand und einem PTC-Widerstand gebildeten Spannungsteilers ein weiteres Zusatzsignal in den Zuführungsanschluß des Steuersignales eingespeist ist.The integration of an overload protection for the blower motor in the circuit arrangement is possible by means of one from a fixed resistor and a PTC resistor formed voltage divider another additional signal in the Feed connection of the control signal is fed.

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

FIG 1
ein Blockschaltbild einer Schaltungsanordnung zur Saugleistungsregelung eines Staubsaugers,
FIG 2
ein Schaltbild des Leistungsteiles der Schaltungsanordnung nach FIG 1,
FIG 3
ein Schaltbild des Steuerteiles der Schaltungsanordnung nach FIG 1,
FIG 4
ein Schaltbild des Regelteiles der Schaltungsanordnung nach FIG 1.
The invention is described in more detail below on the basis of an exemplary embodiment shown in the drawing. It shows:
FIG. 1
2 shows a block diagram of a circuit arrangement for controlling the suction power of a vacuum cleaner,
FIG 2
2 shows a circuit diagram of the power section of the circuit arrangement according to FIG. 1,
FIG 3
2 shows a circuit diagram of the control part of the circuit arrangement according to FIG. 1,
FIG 4
2 shows a circuit diagram of the control part of the circuit arrangement according to FIG. 1.

Mit 1 ist ein das Geblase eines Staubsaugers antreibender Gebläsemotor bezeichnet, der über ein steuerbares Halbleiterschaltelement 2 in seiner Leistung regelbar ist. Das Halbleiterschaltelement 2 ist mit seinem Steueranschluß 3 an einen Leistungsteil 4 angeschlossen. Mit dem Leistungsteil 4 ist ein Synchronteil 5 verbunden, der auf einen Steuerteil 6 wirkt. Auf diesen Steuerteil 6 wirkt ferner ein Regelteil 7. Das Steuerteil 6 beeinflußt seinerseits einen Zündimpulsteil 8, der mit seinem Ausgang das das Halbleiterschaltelement 2 steuernde Glied des Leistungsteils 4 entsprechend ansteuert.With 1 is a blower driving a vacuum cleaner Blower motor called, which has a controllable semiconductor switching element 2 is adjustable in its performance. The semiconductor switching element 2 is with its control connection 3 a power section 4 connected. With the power section 4 a synchronous part 5 is connected, which is connected to a control part 6 works. A control part 7 also acts on this control part 6. The control part 6 in turn influences an ignition pulse part 8, the output of which is the semiconductor switching element 2 controlling element of the power section 4 controls accordingly.

Dieses das Halbleiterschaltelement 2 steuernde Glied ist, wie aus der FIG 2 entnehmbar, ein Steuertransistor 9, dessen Basis 10 über eine erste Steuerleitung 11 mit dem Zündimpulsteil 8 verbunden ist. Der Leistungsteil 4 enthält ferner einen Schaltungsteil 12 zur Erzeugung einer Versorgungsgleichspannung. Der Schaltungsteil 12 weist hierzu ein Reihen-RC-Glied 13 auf, zu dem zwei Dioden 14 antiparallel in Reihe liegen. Die beiden Dioden 14 sind mit ihrer anderen Anschlußseite jeweils an einen Pol eines Glättungskondensators 15 angeschlossen. Zu dem Glättungskondensator 15 ist ferner eine Zenerdiode 16 zur Spannungsstabilisierung parallel geschaltet. Die am Glättungskondensator 15 anstehende Spannung stellt die Versorgungsgleichspannung für die Schaltungsanordnung dar.This member controlling the semiconductor switching element 2 is like can be seen from FIG 2, a control transistor 9, the Base 10 via a first control line 11 with the Ignition pulse part 8 is connected. The power section 4 contains also a circuit part 12 for generating a DC supply voltage. The circuit part 12 points to this a series RC element 13 to which two diodes 14 lie antiparallel in row. The two diodes 14 are with their other connection side to one pole each Smoothing capacitor 15 connected. To that Smoothing capacitor 15 is also a Zener diode 16 for Voltage stabilization connected in parallel. The most Smoothing capacitor 15 applied voltage represents the DC supply voltage for the circuit arrangement.

Der Leistungsteil 4 enthält ferner einen an der Versorgungsspannung des Gebläsemotors 1 liegenden ersten Spannungsteiler 17, an dessen Abgriff ein Filterkondensator 18 mit seinem einen Anschlußpol angeschlossen ist. Durch diesen Filterkondensator 18 werden evtl. in der heruntergeteilten Wechselspannung enthaltene Gleichspannungsanteile unterdrückt. An den anderen Anschlußpol 19 des Filterkondensators 18 ist der Synchronteil 5 angeschlossen.The power section 4 also contains one at the supply voltage of the blower motor 1 lying first voltage divider 17, at the tap of a filter capacitor 18 with its a connection pole is connected. Through this filter capacitor 18 may be in the divided AC voltage contained DC voltage components suppressed. On the other connection pole 19 of the filter capacitor 18 is the Synchronous part 5 connected.

Der Synchronteil 5 weist einen aus einem ersten und zweiten Operationsverstärker 20 und 21 bestehenden Fensterkomparator auf. Die von dem Filterkondensator 18 gelieferte Wechselspannung ist an den invertierenden Eingang des ersten Operationsverstärkers 20 und an den nicht invertierenden Eingang des zweiten Operationsverstärkers 21 gelegt. Mit ihrem jeweils anderen Eingang liegen die beiden Operationsverstärker 20 und 21 über Teilerwiderstände 22 an der Versorgungsgleichspannung. Bei einem derartig geschalteten Fensterkomparator entstehen bei jedem Nulldurchgang der anliegenden Wechselspannung an dessen Ausgang 23 schmale Rechteckimpulse. Durch diese Impulse wird ein mit seiner Kollektor-Emitter-Strecke zu einem über einen Vorwiderstand 24 an die Versorgungsgleichspannung angeschlossenen Kondensator 25 parallel geschalteter Ladetransistor 26 angesteuert. Über den wahrend der Dauer der Rechteckimpulse durchgesteuerten Entladetransistors 26 wird der Kondensator 25 periodisch über einen im Kollektor-Emitter-Kreis liegenden Entladewiderstand 27 entladen. Während der Sperrdauer des Entladetransistors 26 erfolgt jeweils wieder ein Aufladen des Kondensators 25. Damit wird eine sägezahnförmige Spannung gebildet. Diese sägezahnförmige Spannung ist an den invertierenden Eingang eines als Vergleicher wirkenden Operationsverstärkers 28 gelegt. Dem nicht invertierenden Eingang dieses Operationsverstärkers 28 wird über eine zweite Steuerleitung 29 ein Steuersignal zugeführt.The synchronizing part 5 has one of a first and a second Operational amplifier 20 and 21 existing window comparator on. The AC voltage supplied by the filter capacitor 18 is to the inverting input of the first Operational amplifier 20 and on the non-inverting Input of the second operational amplifier 21 placed. With the two operational amplifiers are located at their other inputs 20 and 21 via divider resistors 22 on the DC supply voltage. With such a switched Window comparators occur at every zero crossing AC voltage present at its output 23 narrow Rectangular pulses. Through these impulses one becomes with his Collector-emitter path to a via a series resistor 24 connected to the DC supply voltage Capacitor 25 charging transistor 26 connected in parallel controlled. About during the duration of the rectangular pulses controlled discharge transistor 26 becomes the capacitor 25 periodically over a lying in the collector-emitter circuit Discharge resistor 27 discharge. During the blocking period of the Discharge transistor 26 is charged again in each case Capacitor 25. This creates a sawtooth voltage educated. This sawtooth-shaped voltage is on the inverting input of a comparator Operational amplifier 28 placed. The non-inverting Input of this operational amplifier 28 is via a second Control line 29 is supplied with a control signal.

An den Ausgang 30 des als Vergleicher wirkenden Operationsverstärkers 28 ist ein Differenzierglied 31 angeschlossen, dessen Ausgang 32 mit dem invertierenden Eingang eines Komparators 33 verbunden ist, an dessen nicht invertierenden Eingang mittels eines zweiten Spannungsteilers 34 eine Referenzspannung gelegt ist. Der Ausgang 35 des Komparators 33 ist über die erste Steuerleitung 11 mit der Basis 10 des Steuertransistors 9 verbunden.At the output 30 of the operational amplifier acting as a comparator 28 a differentiator 31 is connected, whose output 32 with the inverting input one Comparator 33 is connected to its non-inverting Input by means of a second voltage divider 34 a Reference voltage is set. The output 35 of the comparator 33 is connected via the first control line 11 to the base 10 of the Control transistor 9 connected.

Der Regelteil 7 (FIG 4) enthält einen dritten Spannungsteiler 36, an dessen Abgriff 37 ein Potentiometer 38 und die Parallelschaltung eines Steuerwiderstandes 39 mit einem Druckschalter 40 angeschlossen ist. Die aus dem Steuerwiderstand 39 und dem Druckschalter 40 bestehende Parallelschaltung ist ferner über ein Steuer-RC-Glied 41 an Masse geführt. Über einen Umschalter 42 kann wahlweise der Abgriff des Potentiometers 38 oder der gemeinsame Verbindungspunkt 43 des Steuerwiderstandes 39 und des Druckschalters 40 mit dem Steuer-RC-Glied 41 über einen Verbindungswiderstand 44 an die Steuerleitung 29 geschaltet werden. Zwischen dem Umschalter 42 und dem Verbindungswiderstand 44 ist noch ein Begrenzungswiderstand 45 mit seinem einen Anschlußpol angeschlossen, dessen anderer Anschlußpol an Masse liegt. Mit der Steuerleitung 29 ist ein zusätzlicher Steuerteil 46 verbunden. Dieser zusätzliche Steuerteil 46 enthält ein Reihen-RC-Glied 47 und einen aus einem Festwiderstand 48 und einem PTC-Widerstand 51 bestehenden Spannungsteiler. Der Abgriff des Reihen-RC-Gliedes 47 und des Spannungsteilers ist jeweils über eine Entkopplungsdiode 49 bzw.50 mit der Steuerleitung 29 verbunden.The control section 7 (FIG 4) contains a third voltage divider 36, at the tap 37 a potentiometer 38 and the Parallel connection of a control resistor 39 with a Pressure switch 40 is connected. The one from the control resistor 39 and the pressure switch 40 existing parallel connection is also connected to ground via a control RC element 41. Via a switch 42, the tap of the Potentiometer 38 or the common connection point 43 of the Control resistor 39 and the pressure switch 40 with the Control RC element 41 via a connection resistor 44 to the Control line 29 are switched. Between the switch 42 and the connecting resistor 44 is still a limiting resistor 45 connected with its one connection pole, whose other terminal is connected to ground. With the control line 29 an additional control part 46 is connected. This additional control part 46 contains a series RC element 47 and one of a fixed resistor 48 and a PTC resistor 51 existing voltage dividers. The tap of the series RC link 47 and the voltage divider is in each case one Decoupling diode 49 or 50 with the control line 29 connected.

Die Schaltungsanordnung arbeitet wie folgt:
Wird der Staubsauger mittels eines nicht dargestellten Einschalters an die Netzspannung geschaltet, dann wird über den Schaltungsteil 12 die erforderliche Versorgungsgleichspannung bereitgestellt. Über den ersten Spannungsteiler 17 und den Filterkondensator 18 steht eine gegenüber der Netzspannung niedrigere, jedoch mit dieser synchrone Wechselspannung zur Verfügung. Wie bereits beschrieben, wird mittels des Fensterkomparators 20 und 21 und dem durch diesen gesteuerten Entladetransistor 26 durch entsprechendes Auf- und Entladen des Kondensators 25 eine mit der Wechselspannung synchrone Sägezahnspannung erzeugt. Durch diese am invertierenden Eingang des als Vergleicher wirkenden Operationsverstärkers 28 liegende Sägezahnspannung wird am Ausgang 30 dieses Operationsverstärkers 28 ein "High"-Signal erzeugt. Dieses "High"-Signal bleibt solange bestehen, bis die Sägezahnspannung den Wert des am nicht invertierenden Eingang dieses Operationsverstärkers 28 anliegenden Steuersignales erreicht. In diesem Augenblick wechselt das Ausgangssignal des Operationsverstärkers 28 auf "Low". Infolge dieses Signalwechsels wird durch das Differenzierglied 31 ein schmaler Nadelimpuls erzeugt. Die von dem Differenzierglied 31 ausgehenden Nadelimpulse werden durch den Komparator 33 in entsprechende schmale Rechteckimpulse umgewandelt, welche die Steuerimpulse für den Steuertransistor 9 darstellen und über die erste Steuerleitung 11 der Basis 10 des Steuertransistors 9 zugeführt werden. Der Steuertransistor 9 wird jeweils für die Dauer eines solchen Rechteckimpulses durchgesteuert und zündet damit jedesmal das Halbleiterschaltelement 2.The circuit arrangement works as follows:
If the vacuum cleaner is switched to the mains voltage by means of a switch (not shown), then the required DC supply voltage is provided via the circuit part 12. Via the first voltage divider 17 and the filter capacitor 18, an AC voltage which is lower than the mains voltage but is synchronous with it is available. As already described, a sawtooth voltage which is synchronous with the AC voltage is generated by means of the window comparators 20 and 21 and the discharge transistor 26 controlled by them by correspondingly charging and discharging the capacitor 25. A "high" signal is generated at the output 30 of this operational amplifier 28 by this sawtooth voltage at the inverting input of the operational amplifier 28 acting as a comparator. This "high" signal remains until the sawtooth voltage reaches the value of the control signal present at the non-inverting input of this operational amplifier 28. At this moment, the output signal of the operational amplifier 28 changes to "low". As a result of this signal change, the differentiator 31 generates a narrow needle pulse. The needle pulses emanating from the differentiating element 31 are converted by the comparator 33 into corresponding narrow rectangular pulses, which represent the control pulses for the control transistor 9 and are supplied to the base 10 of the control transistor 9 via the first control line 11. The control transistor 9 is turned on for the duration of such a rectangular pulse and thus fires the semiconductor switching element 2 each time.

Durch eine entsprechende Einstellung des an den nicht invertierenden Eingang des als Vergleicher wirkenden Operationsverstärkers 28 gelegten Steuersignals erfolgt der Wechsel von "High" auf "Low" am Ausgang 30 dieses Operationsverstärkers 28 entsprechend früher oder später. Über den nachgeschalteten Komparator 33 und den von diesem gesteuerten Steuertransistor 9 wird das Halbleiterschaltelement 2 ebenfalls früher oder später angesteuert, so daß der angeschlossene Gebläsemotor in seiner Leistung hoch- oder heruntergeregelt wird.By setting the other accordingly inverting input of the comparator Operational amplifier 28 placed control signal takes place Change from "high" to "low" at output 30 of this Operational amplifier 28 sooner or later accordingly. Via the downstream comparator 33 and this controlled control transistor 9 will Semiconductor switching element 2 also sooner or later controlled so that the connected blower motor in its Power is regulated up or down.

Das dem als Vergleicher wirkenden Operationsverstärker 28 zugeführte Steuersignal kann auf verschiedene Weise verstellt bzw. vorgegeben werden. Die Einstellung dieses Steuersignals kann von Hand mittels des Potentiometers 38 vorgenommen werden. Entsprechend der jeweiligen Stellung des Potentiometers 38 wird der Gebläsemotor 1 auf eine definierte Leistung gesteuert, da infolge des vom Potentiometers 38 fest vorgegebenen Steuersignales an dem als Vergleicher wirkenden Operationsverstärker 28 immer zum gleichen Phasenzeitpunkt der Sägezahnspannung die Signalumschaltung an dessen Ausgang 30 erfolgt. Infolge dessen wird das Halbleiterschaltelement 2 auch immer bei dem gleichen der jeweiligen Potentiometerstellung entsprechenden Phasenwinkel gezündet.That of the operational amplifier 28 acting as a comparator supplied control signal can be adjusted in different ways or be specified. The setting of this control signal can be done by hand using the potentiometer 38 become. According to the respective position of the potentiometer 38, the blower motor 1 is defined Power controlled as a result of being fixed by the potentiometer 38 predetermined control signals on the acting as a comparator Operational amplifier 28 always at the same phase the sawtooth voltage the signal switching at its output 30 takes place. As a result, the semiconductor switching element 2 always with the same potentiometer setting corresponding phase angle ignited.

Wird der Umschalter 42 in seine andere Schaltstellung und damit an den gemeinsamen Verbindungspunkt 43 geschaltet, so erfolgt die Vorgabe des Steuersignals nunmehr durch den Druckschalter 40 und den Steuerwiderstand 39. Sobald im Saugkreis des Staubsaugers der Ansprechdruck des Druckschalters 40 erreicht wird, schließt dieser. Damit wird der Steuerwiderstand 39 überbrückt und die Spannung des Steuersignales erhöht. Dies fuhrt zu einer späteren Zündung des Halbleiterschaltelementes 2, so daß die Motorleistung sinkt. Sobald ein bestimmter Unterdruck im Saugkreis unterschritten wird, öffnet der Druckschalter 40 wieder und schaltet damit den Steuerwiderstand 39 ein. Dies hat ein Absinken der Spannung des Steuersignales zur Folge, so daß die Zündung des Halbleiterschaltelementes 2 früher erfolgt und dadurch die Leistung des Gebläsemotors 1 und somit auch der Unterdruck im Saugkreis wieder erhöht wird, bis schließlich der Druckschalter 40 in Folge des angestiegenen Unterdruckes wieder schließt und damit den Steuerwiderstand 39 überbrückt, so daß sich der beschriebene Vorgang wiederholt. Hierdurch wird eine Regelung des Staubsaugers auf konstanten Unterdruck erreicht.The switch 42 in its other switching position and switched to the common connection point 43, so the control signal is now specified by the Pressure switch 40 and the control resistor 39. As soon as in the suction circuit of the vacuum cleaner the response pressure of the pressure switch 40 is reached, this closes. With that the Control resistor 39 bridges and the voltage of the control signal elevated. This leads to a later ignition of the Semiconductor switching element 2, so that the motor power drops. As soon as the vacuum falls below a certain vacuum the pressure switch 40 opens again and thus switches the control resistor 39 a. This has a drop in Voltage of the control signal, so that the ignition of the Semiconductor switching element 2 takes place earlier and thereby Power of the blower motor 1 and thus also the negative pressure in the Suction circuit is increased again until finally the pressure switch 40 again as a result of the increased negative pressure closes and thus bridges the control resistor 39, so that the process described is repeated. This will create a Control of vacuum cleaner at constant vacuum reached.

In dem Regelteil 7 wird durch den an Masse liegenden Widerstandsteil des dritten Spannungsteilers 36 ein Minimalwert der Spannung am Gebläsemotor eingestellt. Die Begrenzung auf einen Maximalwert der Motorspannung erfolgt durch den Begrenzungswiderstand 45. In the control part 7 is due to the resistance part connected to ground of the third voltage divider 36 is a minimum value the voltage on the blower motor. The limit on a maximum value of the motor voltage is given by the Limiting resistance 45.

Bei der beschriebenen Schaltungsanordnung wird durch den zusätzlichen Steuerteil 46 noch eine Anlaufstrombegrenzung und ein Übertemperaturschutz bewirkt. Zur Anlaufstrombegrenzung dient das Reihen-RC-Glied 47 des Steuerteiles 46. Über den Kondensator dieses Reihen-RC-Gliedes 47 wird im Einschaltaugenblick des Staubsaugers die Spannung des Steuersignales angehoben, so daß der Zündwinkel des Halbleiterschaltelementes vergrößert und dadurch der Anlaufstrom verkleinert wird. Mit fortschreitender Aufladung des Kondensators des Reihen-RC-Gliedes 47 sinkt die Spannung des Steuersignales, was eine Verkleinerung des Zündwinkels des Halbleiterschaltelementes 2 und damit eine Erhöhung der Motorleistung zur Folge hat. Durch die Entkopplungsdiode 49 wird das Reihen-RC-Glied 47 von der Steuerleitung 29 wirkungsmäßig abgekoppelt, sobald die Spannung am Abgriff dieses Reihen-RC-Gliedes 47 den Spannungswert des über das Potentiometer 38 oder die Parallelschaltung von Steuerwiderstand 39 und Druckschalter 40 vorgegebenen Steuersignales erreicht hat.In the circuit arrangement described by the additional control part 46 still a starting current limitation and causes overtemperature protection. For starting current limitation serves the series RC element 47 of the control part 46. About the capacitor of this series RC element 47 is in Switch-on instant of the vacuum cleaner the voltage of the control signal raised so that the firing angle of the semiconductor switching element increases and thus the starting current is reduced. With progressive charging of the capacitor of the series RC element 47, the voltage of the Control signal, which is a reduction in the ignition angle of the Semiconductor switching element 2 and thus an increase in Engine performance. Through the decoupling diode 49 the series RC element 47 is replaced by the control line 29 effectively disconnected as soon as the voltage at the tap this series RC element 47 the voltage value of the over Potentiometer 38 or the parallel connection of control resistor 39 and pressure switch 40 predetermined control signals has reached.

Ein Überlastschutz wird durch den aus einem Festwiderstand 48 und einem PTC-Widerstand 51 bestehenden Spannungsteiler des Steuerteils 46 erreicht. Bei entsprechender Erwärmung des Gebläsemotors 1 steigt der Widerstand des PTC-Widerstandes 51 an. Erreicht die Spannung am Abgriff dieses Spannungsteilers 48;51 einen höheren Wert als die Spannung des in der zweiten Steuerleitung 29 anstehenden Steuersignales, wird über die Entkopplungsdiode 50 diese höhere Spannung in der zweiten Steuerleitung 29 wirksam. Dies führt über den als Vergleicher wirkenden Operationsverstärker 28 und die diesem nachgeschalteten Steuerelemente zu einer Vergrößerung des Zündwinkels des Halbleiterschaltelementes 2 und somit zu einer Leistungsreduzierung des Gebläsemotors 1.Overload protection is provided by a fixed resistor 48 and a PTC resistor 51 existing voltage divider of the Control part 46 reached. With appropriate heating of the Blower motor 1, the resistance of the PTC resistor 51 rises on. Reaches the voltage at the tap of this voltage divider 48; 51 a higher value than the voltage of the second Control line 29 pending control signal is via the Decoupling diode 50 this higher voltage in the second Control line 29 effective. This leads over to the comparator acting operational amplifier 28 and this downstream controls to enlarge the Firing angle of the semiconductor switching element 2 and thus too a reduction in the power of the blower motor 1.

Claims (9)

  1. Circuit arrangement for suction power regulation of a vacuum cleaner, the fan motor (1) of which is associated with a semiconductor switching element (2) controllable by means of a drive control circuit, in which circuit arrangement the drive control circuit comprises a comparator (28), to which a periodically varying signal and a settable control signal are fed and from the output signal of which the control pulses for the semiconductor switching element (2) are formed, and the control signal for the drive control circuit is selectably settable by hand each time to a specific value or can be changed over by means of a pressure switch (40) between two predetermined different values.
  2. Circuit arrangement according to claim 1, in which the comparator consists of an operational amplifier (28), to the one input of which a sawtooth voltage synchronised with mains voltage of the fan motor (1) is applied and to the other input of which the control signal is fed.
  3. Circuit arrangement according to claim 2, in which the output of the operational amplifier (28) is connected by way of a differentiating element (31) with the one output of a comparator (33), to the other input of which is applied a fixed composition voltage.
  4. Circuit arrangement according to claim 1, 2 or 3, in which the control signal is settable by means of a potentiometer (38).
  5. Circuit arrangement according to claim 1, 2 or 3, in which the control signal is settable by means of a pressure switch (40) lying parallel to a control resistance (39).
  6. Circuit arrangement according to claim 4 and 5, in which the feed terminal for the control signal is connectible by means of a changeover switch (42) selectably with the potentiometer (38) or the parallel circuit of the control resistance (39) and the pressure switch (40).
  7. Circuit arrangement according to claim 4, 5 or 6, in which additional resistances (36, 45), by which the control signal is limited to a minimum and maximum value, are arranged in the control signal circuit.
  8. Circuit arrangement according to one or more of the preceding claims, in which a supplementary signal is fed into the supply terminal of the control signal to the comparator (28) by means of a series RC element (47).
  9. Circuit arrangement according to one or more of the preceding claims, in which a further supplementary signal is fed into the supply terminal of the control signal by means of a voltage divider formed from a fixed resistance (48) and a PTC resistance (51).
EP95105303A 1994-04-21 1995-04-07 Circuit for controlling the suction capacity of a vacuum cleaner Expired - Lifetime EP0678271B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4413976 1994-04-21
DE4413976 1994-04-21

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EP0678271A3 EP0678271A3 (en) 1998-07-08
EP0678271B1 true EP0678271B1 (en) 2000-10-18

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009233A1 (en) * 2006-02-28 2007-09-06 BSH Bosch und Siemens Hausgeräte GmbH Device for controlling the suction power of a vacuum cleaner
DE202008002310U1 (en) 2008-02-20 2009-06-25 BSH Bosch und Siemens Hausgeräte GmbH Device for automatic suction power control of a vacuum cleaner
DE102008010068A1 (en) 2008-02-20 2009-08-27 BSH Bosch und Siemens Hausgeräte GmbH Automatic suction power control device for floor vacuum cleaner, has control circuit for increasing suction power controlled by control loop when signal of pressure sensor reaches lower threshold value
WO2009103585A1 (en) 2008-02-20 2009-08-27 BSH Bosch und Siemens Hausgeräte GmbH Device for the automatic suction power regulation of a vacuum cleaner

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19937626A1 (en) 1999-08-10 2001-02-15 Bsh Bosch Siemens Hausgeraete Circuit arrangement for power control of an electrical consumer
DE102011006539B4 (en) * 2011-03-31 2019-11-14 BSH Hausgeräte GmbH Vacuum cleaner and method for operation-dependent operation of a vacuum cleaner

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DE3030059C2 (en) * 1980-08-08 1984-06-07 Progress-Elektrogeräte Mauz & Pfeiffer GmbH & Co, 7000 Stuttgart vacuum cleaner
DE3112376A1 (en) * 1981-03-28 1982-11-18 Miele & Cie GmbH & Co, 4830 Gütersloh Vacuum cleaner, especially a floor vacuum cleaner
JPS59153490A (en) * 1983-02-16 1984-09-01 Sanyo Electric Co Ltd Electric 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
SE449947B (en) * 1985-10-04 1987-06-01 Electrolux Ab DEVICE FOR A VACUUM CLEANER
DE3914306A1 (en) * 1988-12-16 1990-06-28 Interlava Ag DEVICE FOR REGULATING AND / OR DISPLAYING THE OPERATION OF VACUUM CLEANERS

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009233A1 (en) * 2006-02-28 2007-09-06 BSH Bosch und Siemens Hausgeräte GmbH Device for controlling the suction power of a vacuum cleaner
WO2007098979A1 (en) 2006-02-28 2007-09-07 BSH Bosch und Siemens Hausgeräte GmbH Device for regulating the suction power of a vacuum cleaner
DE102006009233B4 (en) * 2006-02-28 2008-01-10 BSH Bosch und Siemens Hausgeräte GmbH Device for controlling the suction power of a vacuum cleaner
DE202008002310U1 (en) 2008-02-20 2009-06-25 BSH Bosch und Siemens Hausgeräte GmbH Device for automatic suction power control of a vacuum cleaner
DE102008010068A1 (en) 2008-02-20 2009-08-27 BSH Bosch und Siemens Hausgeräte GmbH Automatic suction power control device for floor vacuum cleaner, has control circuit for increasing suction power controlled by control loop when signal of pressure sensor reaches lower threshold value
WO2009103585A1 (en) 2008-02-20 2009-08-27 BSH Bosch und Siemens Hausgeräte GmbH Device for the automatic suction power regulation of a vacuum cleaner
DE102008010068B4 (en) * 2008-02-20 2013-02-28 BSH Bosch und Siemens Hausgeräte GmbH Device for automatic suction power control of a vacuum cleaner

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Publication number Publication date
EP0678271A3 (en) 1998-07-08
DE59508787D1 (en) 2000-11-23
ES2152997T3 (en) 2001-02-16
EP0678271A2 (en) 1995-10-25

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