EP1482764B1 - Electrical circuit arrangement in a hair care device - Google Patents

Electrical circuit arrangement in a hair care device Download PDF

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Publication number
EP1482764B1
EP1482764B1 EP04010958A EP04010958A EP1482764B1 EP 1482764 B1 EP1482764 B1 EP 1482764B1 EP 04010958 A EP04010958 A EP 04010958A EP 04010958 A EP04010958 A EP 04010958A EP 1482764 B1 EP1482764 B1 EP 1482764B1
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EP
European Patent Office
Prior art keywords
resistor
heating
circuit arrangement
switch
electric motor
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EP04010958A
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German (de)
French (fr)
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EP1482764A1 (en
Inventor
Boris Wonka
Dirk Markgraf
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Braun GmbH
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Braun GmbH
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    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D20/00—Hair drying devices; Accessories therefor
    • A45D20/22—Helmets with hot air supply or ventilating means, e.g. electrically heated air current
    • A45D20/30—Electric circuitry specially adapted for hair drying devices

Definitions

  • the invention relates to an electrical circuit arrangement in a hair care appliance, with an electric motor which is connected via a resistor to a voltage, and with a heating resistor which is also connected to the voltage, wherein the electric motor and the resistor form a series circuit, wherein a switch and the heating resistor form a series circuit and wherein the two series circuits are connected in parallel and the connection point of the switch and the heating resistor is connected via a further electrical component to the resistor.
  • Such a circuit arrangement is already known from NL-A-8 005 531.
  • There two switch groups are provided with which independently of each other on the one hand, the speed of the electric motor and on the other hand, the heating power can be adjusted.
  • an electric hair care device such as a hairdryer
  • two levels of performance are often provided. It is desirable not only the heating power of the hair dryer form differently at these two power levels, but also the speed of the same. This is usually achieved in that in addition to a main switch S1, two further switches S2 and S3 are provided, namely a switch for switching the heating power and another switch for switching the speed. Obviously this is associated with an increased circuit complexity.
  • the object of the invention is to provide an electrical circuit arrangement, in particular for a hair care device, on the one hand has two power levels, but on the other hand requires less circuit complexity and in particular only a switch for switching speed and heating power is necessary.
  • the electric motor When the switch is open, the electric motor is supplied with power via the series-connected resistor and the heating resistor via the further electrical component.
  • the switch When the switch is closed, an additional current flows through the switch to the electric motor and the heating resistor is directly, so not on the other electrical component powered. This is when the switch is closed, an increased speed of the electric motor and an increased heating power of the heating resistor.
  • the switching between the two power levels is thus achieved with a significantly reduced circuit complexity.
  • only a single switch for both switching so for the switching of the speed of the electric motor, as well as for the switching of the heating power of the heating resistor is required.
  • a resistor or a capacitor or a diode is provided as a further electrical component.
  • the capacitor or the diode the power loss of the electrical circuit arrangement according to the invention is reduced.
  • two heating resistors are provided, and there are provided as a further electrical component, two diodes.
  • the two power levels of the circuit arrangement according to the invention can be influenced in a simple manner.
  • FIG. 1 shows a first electrical circuit arrangement 10, which can be used in particular in the case of an electric hair dryer or an electric curling iron or, more generally, in an electric hair care appliance.
  • an electric motor M in particular a blower motor, is connected in the middle branch of a diode bridge consisting of four diodes D1, D2, D3, D4.
  • the diodes D2, D1 on the one hand and the diodes D4, D3 on the other hand are thus connected in the forward direction parallel to the electric motor M.
  • the common connection point of the two diodes D1, D2 is connected to a first pole 11 via an on / off switch S1.
  • the common connection point of the two diodes D3, D4 is connected to a second pole 12 via two series-connected resistors R2a, R2b.
  • the two poles 11, 12 are provided for connection to an AC voltage, in particular to a 220V mains voltage.
  • the two resistors R2a, R2b are in particular a split pre-resistance for the electric motor M.
  • the common connection point of the two diodes D1, D2 is furthermore connected to the second pole 12 via a heating resistor R1 and a switch S2 connected in series.
  • the electric motor M and the two resistors R2a, R2b on the one hand and the switch S2 and the heating resistor R1 on the other hand thus form a parallel circuit.
  • connection point of the heating resistor R1 and the switch S2 is connected via a resistor R3 to the connection point of the two series-connected resistors R2a, R2b.
  • a current flows through the heating resistor R1 and the resistors R2a, R3.
  • the output heating power of the heating resistor R1 depends on the current flowing through the heating resistor R1 and thus on the values of the heating resistor R1 and the values of the resistors R2a, R3.
  • the circuit 10 is thus switched from a first to a second power level, wherein in the second stage, the speed of the electric motor M and the heating power of the heating resistor R1 is increased.
  • the speed of the electric motor M and the heating power of the heating resistor R1 in the two stages can be adjusted by a corresponding dimensioning of the resistors R1, R2a, R2b, R3.
  • FIG. 2 shows a second circuit arrangement 15, which largely corresponds to the circuit arrangement 10 of FIG. Similar components are therefore identified by the same reference numerals.
  • the essential difference between the circuit arrangement 15 of FIG. 2 and the circuit arrangement 10 of FIG. 1 is that the resistor R3 of FIG. 1 is replaced by a capacitor C1 in FIG.
  • the mode of operation of the circuit arrangement 15 of FIG. 2 corresponds essentially to the mode of operation of the circuit arrangement 10 of FIG.
  • the circuit arrangement 15 of FIG. 2 is also switched from a first to a second power stage by closing the switch S2, the speed of the electric motor M and the heating power of the heating resistor R1 being increased in the second stage.
  • the essential difference achieved by using the capacitor C1 instead of the resistor R3 is that the capacitor C1 has no influence on the heating power of the heating resistor R1 when the switch S2 is open or on the speed of the electric motor M when the switch S2 is closed.
  • the capacitor C1 is so far a short circuit.
  • the speed of the electric motor M and the heating power of the heating resistor R1 in the two power levels can thus be adjusted by a corresponding dimensioning of the resistors R1, R2a, R2b.
  • FIG. 3 shows a third circuit arrangement 16, which largely corresponds to the circuit arrangement 10 of FIG. Similar components are therefore identified by the same reference numerals.
  • the essential difference between the circuit arrangement 16 of FIG. 3 and the circuit arrangement 10 of FIG. 1 is that the resistor R3 of FIG. 1 is replaced by a diode D5 in FIG.
  • the forward direction of the diode D5 is connected in the direction of the two resistors R2a, R2b.
  • one of the two half-waves of the alternating current flows through the heating resistor R1, the diode D5 and the resistor R2a.
  • the output heating power of the heating resistor R1 thus depends on the values of the heating resistor R1 and the resistor R2a.
  • the circuit 16 is thus switched from a first to a second power level, wherein in the second stage, the speed of the electric motor M and the heating power of the heating resistor R1 is increased.
  • the speed of the electric motor M and the heating power of the heating resistor R1 in the two stages can be adjusted by a corresponding dimensioning of the resistors R1, R2a, R2b.
  • this dimensioning is also to be noted in addition that in the heating power of the heating resistor R1 with open switch S2 only a half-wave of the alternating current comes into effect, and that corresponding with closed switch S2 also applies to the speed of the electric motor M.
  • FIG. 4 shows a fourth circuit arrangement 17, which largely corresponds to the circuit arrangement 16 of FIG. Similar components are therefore identified by the same reference numerals.
  • the essential difference between the circuit arrangement 17 of FIG. 4 and the circuit arrangement 16 of FIG. 3 is that two diodes D5, D6 and two heating resistors R1a, R1b are provided.
  • the two diodes D5, D6 are connected in series between the connection point of the two resistors R2a, R2b and the connection point of the heating resistor R1b and the switch S2.
  • the forward direction of the diodes D5, D6 is connected in the direction of the two resistors R2a, R2b.
  • the two heating resistors R1a, R2b are connected in parallel.
  • the heating resistor R1 a is connected to the connection point of the two diodes D5, D6 and the heating resistor R1b is connected to the switch S2.
  • one of the two half-waves of the alternating current flows through the two heating resistors R1a, R1b, the diodes D5, D6 and the resistor R2a.
  • the output heating power of the heating resistors R1a, R1b thus depends on the values of the heating resistors R1a, R1b and the resistor R2a.
  • the circuit 16 is thus switched from a first to a second power level, wherein in the second stage, the speed of the electric motor M and the heating power of the heating resistors R1a, R1b is increased.
  • the speed of the electric motor M and the heating power of the heating resistors R1a, R1b in the two stages can be adjusted by a corresponding dimensioning of the resistors R1a, R1b, R2a, R2b.
  • this dimensioning is also to be noted in addition that in the heating power of the heating resistors R1a, R1b only one half-wave of the alternating current comes into effect, and that corresponding with closed switch S2 also applies to the speed of the electric motor M.
  • the rotational speed of the electric motor M and the heating power of the heating resistor or resistors R1, R1a, R1b in the two stages can be influenced by an appropriate choice of the flow directions of the diodes D5, D6.
  • the described procedure can be applied in a corresponding manner also for a third power stage or in general for further power stages of the rotational speed of the electric motor M and the heating power of the heating resistor or resistors R1, R1a, R1b.
  • the described circuit arrangements 10, 16, 17, 18 can thus be switched back and forth with the switch S2 with respect to the rotational speed of the electric motor M and the heating power of the heating resistor or resistors R1, R1a, R1b between two power levels.

Abstract

The circuit arrangement (10) has an electric motor (M) for connection via a resistance (2a,2b) to a voltage and a heating resistance (R1) also for connection to the voltage. The motor and resistance form a series circuit, a switch (S2) and the heating resistance form a series circuit and the series circuits are connected in parallel. The junction of the switch and heating resistance is connected via a further electrical component to the resistance.

Description

Die Erfindung geht aus von einer elektrischen Schaltungsanordnung in einem Haarpflegegerät, mit einem Elektromotor, der über einen Widerstand an eine Spannung anschließbar ist, und mit einem Heizwiderstand, der ebenfalls an die Spannung anschließbar ist, wobei der Elektromotor und der Widerstand eine Serienschaltung bilden, wobei ein Schalter und der Heizwiderstand eine Serienschaltung bilden und wobei die beiden Serienschaltungen parallel geschaltet sind und der Verbindungspunkt des Schalters und des Heizwiderstandes über ein weiteres elektrisches Bauelement mit dem Widerstand verbunden ist.The invention relates to an electrical circuit arrangement in a hair care appliance, with an electric motor which is connected via a resistor to a voltage, and with a heating resistor which is also connected to the voltage, wherein the electric motor and the resistor form a series circuit, wherein a switch and the heating resistor form a series circuit and wherein the two series circuits are connected in parallel and the connection point of the switch and the heating resistor is connected via a further electrical component to the resistor.

Eine derartige Schaltungsanordnung ist bereits aus der NL-A-8 005 531 bekannt. Dort sind zwei Schaltergruppen vorgesehen, mit denen unabhängig voneinander einerseits die Drehzahl des Elektromotors und andererseits die Heizleistung eingestellt werden kann.Such a circuit arrangement is already known from NL-A-8 005 531. There two switch groups are provided with which independently of each other on the one hand, the speed of the electric motor and on the other hand, the heating power can be adjusted.

Eine ähnliche Schaltungsanordnung ist auch der US-A-4 003 388 bekannt, bei der ebenfalls zwei Schalter vorgesehen sind, mit denen unabhängig voneinander die Heizleistung beziehungsweise die Drehzahl des Elektromotors variiert werden kann.A similar circuit arrangement is also known from US-A-4 003 388, in which also two switches are provided, with which independently of each other the heating power or the rotational speed of the electric motor can be varied.

Aus der DE-A-27 35 420 ist eine weitere elektrische Schaltungsanordnung in einem Haarpflegegerät bereits bekannt.From DE-A-27 35 420 a further electrical circuit arrangement in a hair care appliance is already known.

Bei einem elektrischen Haarpflegegerät, beispielsweise bei einem Haartrockner, sind häufig zwei Leistungsstufen vorgesehen. Dabei ist es wünschenswert, bei diesen beiden Leistungsstufen nicht nur die Heizleistung des Haartrockners unterschiedlich auszubilden, sondern auch die Drehzahl desselben. Dies wird üblicherweise dadurch erreicht, dass neben einem Hauptschalter S1 zwei weitere Schalter S2 und S3 vorgesehen sind, und zwar ein Schalter für die Umschaltung der Heizleistung und ein weiterer Schalter für die Umschaltung der Drehzahl. Ersichtlich ist damit ein erhöhter schaltungstechnischer Aufwand verbunden.In an electric hair care device, such as a hairdryer, two levels of performance are often provided. It is desirable not only the heating power of the hair dryer form differently at these two power levels, but also the speed of the same. This is usually achieved in that in addition to a main switch S1, two further switches S2 and S3 are provided, namely a switch for switching the heating power and another switch for switching the speed. Obviously this is associated with an increased circuit complexity.

Aufgabe der Erfindung ist es, eine elektrische Schaltungsanordnung insbesondere für ein Haarpflegegerät zu schaffen, das einerseits zwei Leistungsstufen aufweist, andererseits aber weniger schaltungstechnischen Aufwand erfordert und insbesondere nur ein Schalter zur Umschaltung von Drehzahl und Heizleistung notwendig ist.The object of the invention is to provide an electrical circuit arrangement, in particular for a hair care device, on the one hand has two power levels, but on the other hand requires less circuit complexity and in particular only a switch for switching speed and heating power is necessary.

Diese Aufgabe wird bei einer elektrischen Schaltungsanordnung der eingangs genannten Art erfindungsgemäß dadurch gelöst, dass der Widerstand geteilt ist und dass das weitere elektrische Bauelement mit dem Verbindungspunkt des geteilten Widerstands und mit dem Verbindungspunkt des Ein-/Aus-Schalters und des Heizwiderstandes elektrisch leitend verbunden ist.This object is achieved in an electrical circuit arrangement of the aforementioned type according to the invention that the resistor is divided and that the further electrical component is electrically connected to the connection point of the divided resistor and to the connection point of the on / off switch and the heating resistor ,

Für die Umschaltung zwischen den beiden Leistungsstufen ist somit nur ein einziger Schalter erforderlich.For switching between the two power levels so only a single switch is required.

Bei geöffnetem Schalter wird der Elektromotor über den in Serie geschalteten Widerstand und der Heizwiderstand über das weitere elektrische Bauelement mit Strom versorgt. Bei geschlossenem Schalter fließt ein zusätzlicher Strom über den Schalter zu dem Elektromotor und der Heizwiderstand wird direkt, also nicht über das weitere elektrische Bauelement mit Strom versorgt. Damit liegt bei geschlossenem Schalter eine erhöhte Drehzahl des Elektromotors und eine erhöhte Heizleistung des Heizwiderstands vor.When the switch is open, the electric motor is supplied with power via the series-connected resistor and the heating resistor via the further electrical component. When the switch is closed, an additional current flows through the switch to the electric motor and the heating resistor is directly, so not on the other electrical component powered. This is when the switch is closed, an increased speed of the electric motor and an increased heating power of the heating resistor.

Die Umschaltung zwischen den beiden Leistungsstufen wird somit mit einem wesentlich verminderten schaltungstechnischen Aufwand erreicht. Insbesondere wird nur noch ein einziger Schalter für beide Umschaltungen, also für die Umschaltung der Drehzahl des Elektromotors, wie auch für die Umschaltung der Heizleistung des Heizwiderstands benötigt.The switching between the two power levels is thus achieved with a significantly reduced circuit complexity. In particular, only a single switch for both switching, so for the switching of the speed of the electric motor, as well as for the switching of the heating power of the heating resistor is required.

Bei vorteilhaften Ausgestaltungen der Erfindung ist als weiteres elektrisches Bauelement ein Widerstand oder ein Kondensator oder eine Diode vorgesehen. Insbesondere durch die Verwendung des Kondensators oder der Diode wird die Verlustleistung der erfindungsgemäßen elektrischen Schaltungsanordnung vermindert.In advantageous embodiments of the invention, a resistor or a capacitor or a diode is provided as a further electrical component. In particular, by the use of the capacitor or the diode, the power loss of the electrical circuit arrangement according to the invention is reduced.

Bei einer anderen vorteilhaften Ausgestaltung der Erfindung sind zwei Heizwiderstände vorgesehen, und es sind als weiteres elektrisches Bauelement zwei Dioden vorgesehen. Durch die Veränderung der Durchflussrichtungen der beiden Dioden können die beiden Leistungsstufen der erfindungsgemäßen Schaltungsanordnung auf einfache Weise beeinflusst werden.In another advantageous embodiment of the invention, two heating resistors are provided, and there are provided as a further electrical component, two diodes. By changing the flow directions of the two diodes, the two power levels of the circuit arrangement according to the invention can be influenced in a simple manner.

Weitere Merkmale, Anwendungsmöglichkeiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen der Erfindung, die in den Figuren der Zeichnung dargestellt sind. Dabei bilden alle beschriebenen oder dargestellten Merkmale für sich oder in beliebiger Kombination den Gegenstand der Erfindung, unabhängig von ihrer Zusammenfassung in den Patentansprüchen oder deren Rückbeziehung sowie unabhängig von ihrer Formulierung bzw. Darstellung in der Beschreibung bzw. in der Zeichnung.

Figur 1
zeigt ein schematisches Schaltbild eines ersten Ausführungsbeispiels einer erfindungsgemäßen elektrischen Schaltungsanordnung,
Figur 2
zeigt ein schematisches Schaltbild eines zweiten Ausführungsbeispiels einer erfindungsgemäßen elektrischen Schaltungsanordnung,
Figur 3
zeigt ein schematisches Schaltbild eines dritten Ausführungsbeispiels einer erfindungsgemäßen elektrischen Schaltungsanordnung, und
Figur 4
zeigt ein schematisches Schaltbild eines vierten Ausführungsbeispiels einer erfindungsgemäßen elektrischen Schaltungsanordnung.
Other features, applications and advantages of the invention will become apparent from the following description of embodiments of the invention, which are illustrated in the figures of the drawing. All described or illustrated features, alone or in any combination form the subject matter of the invention, regardless of their summary in the claims or their dependency and regardless of their formulation or representation in the description or in the drawing.
FIG. 1
shows a schematic circuit diagram of a first embodiment of an electrical circuit arrangement according to the invention,
FIG. 2
shows a schematic circuit diagram of a second embodiment of an electrical circuit arrangement according to the invention,
FIG. 3
shows a schematic diagram of a third embodiment of an inventive electrical circuit, and
FIG. 4
shows a schematic diagram of a fourth embodiment of an electrical circuit according to the invention.

In der Figur 1 ist eine erste elektrische Schaltungsanordnung 10 dargestellt, die insbesondere bei einem elektrischen Haartrockner oder einem elektrischen Lockenstab oder ganz allgemein bei einem elektrischen Haarpflegegerät verwendbar ist.FIG. 1 shows a first electrical circuit arrangement 10, which can be used in particular in the case of an electric hair dryer or an electric curling iron or, more generally, in an electric hair care appliance.

In der Schaltungsanordnung 10 ist ein Elektromotor M, insbesondere ein Gebläsemotor, in den mittleren Zweig einer aus vier Dioden D1, D2, D3, D4 bestehenden Diodenbrücke geschaltet. Die Dioden D2, D1 einerseits und die Dioden D4, D3 andererseits sind damit in Durchlassrichtung parallel zu dem Elektromotor M geschaltet.In the circuit arrangement 10, an electric motor M, in particular a blower motor, is connected in the middle branch of a diode bridge consisting of four diodes D1, D2, D3, D4. The diodes D2, D1 on the one hand and the diodes D4, D3 on the other hand are thus connected in the forward direction parallel to the electric motor M.

Der gemeinsame Anschlusspunkt der beiden Dioden D1, D2 ist über einen Ein/Ausschalter S1 mit einem ersten Pol 11 verbunden. Der gemeinsame Anschlusspunkt der beiden Dioden D3, D4 ist über zwei in Serie geschaltete Widerstände R2a, R2b mit einem zweiten Pol 12 verbunden. Die beiden Pole 11, 12 sind zum Anschluss an eine Wechselspannung, insbesondere an eine 220V-Netzspannung vorgesehen.The common connection point of the two diodes D1, D2 is connected to a first pole 11 via an on / off switch S1. The common connection point of the two diodes D3, D4 is connected to a second pole 12 via two series-connected resistors R2a, R2b. The two poles 11, 12 are provided for connection to an AC voltage, in particular to a 220V mains voltage.

Bei den beiden Widerständen R2a, R2b handelt es sich insbesondere um einen geteilten Vor-Widerstand für den Elektromotor M.The two resistors R2a, R2b are in particular a split pre-resistance for the electric motor M.

Der gemeinsame Anschlusspunkt der beiden Dioden D1, D2 ist weiterhin über einen Heizwiderstand R1 und einen in Serie geschalteten Schalter S2 mit dem zweiten Pol 12 verbunden. Der Elektromotor M und die beiden Widerstände R2a, R2b einerseits sowie der Schalter S2 und der Heizwiderstand R1 andererseits bilden damit eine Parallelschaltung.The common connection point of the two diodes D1, D2 is furthermore connected to the second pole 12 via a heating resistor R1 and a switch S2 connected in series. The electric motor M and the two resistors R2a, R2b on the one hand and the switch S2 and the heating resistor R1 on the other hand thus form a parallel circuit.

Der Verbindungspunkt des Heizwiderstands R1 und des Schalters S2 ist über einen Widerstand R3 mit dem Verbindungspunkt der beiden in Serie geschalteten Widerstände R2a, R2b verbunden.The connection point of the heating resistor R1 and the switch S2 is connected via a resistor R3 to the connection point of the two series-connected resistors R2a, R2b.

Im eingeschalteten Zustand des Ein/Ausschalters S1 und bei geöffnetem Schalter S2 fließt ein Wechselstrom über die Diodenbrücke und damit über den Elektromotor M sowie über die beiden Widerstände R2a, R2b. Der Elektromotor M ist damit eingeschaltet. Die Drehzahl des Elektromotors M hängt von dem über die beiden Widerstände R2a, R2b fließenden Strom und damit von den Werten dieser beiden Widerstände R2a, R2b ab.In the switched-on state of the on / off switch S1 and with the switch S2 open, an alternating current flows via the diode bridge and thus via the electric motor M and via the two resistors R2a, R2b. The electric motor M is turned on. The rotational speed of the electric motor M depends on the current flowing through the two resistors R2a, R2b and thus on the values of these two resistors R2a, R2b.

Weiterhin fließt ein Strom über den Heizwiderstand R1 und die Widerstände R2a, R3. Die abgegebene Heizleistung des Heizwiderstands R1 hängt von dem über den Heizwiderstand R1 fließenden Strom und damit von den Werten des Heizwiderstands R1 und den Werten der Widerstände R2a, R3 ab.Furthermore, a current flows through the heating resistor R1 and the resistors R2a, R3. The output heating power of the heating resistor R1 depends on the current flowing through the heating resistor R1 and thus on the values of the heating resistor R1 and the values of the resistors R2a, R3.

Wird der Schalter S2 geschlossen, so fließt der Strom nicht mehr über den Widerstand R2a allein, sondern nunmehr über die Parallelschaltung aus dem Widerstand R2a und dem Widerstand R3 zu der Diodenbrücke und damit zu dem Elektromotor M. Damit fließt ein größerer Strom über den Elektromotor M, was gleichbedeutend damit ist, dass die Drehzahl des Elektromotors M erhöht ist.If the switch S2 is closed, the current no longer flows through the resistor R2a alone, but now via the parallel circuit of the resistor R2a and the resistor R3 to the diode bridge and thus to the electric motor M. Thus, a larger current flows through the electric motor M. , which is synonymous with the fact that the rotational speed of the electric motor M is increased.

Gleichzeitig fließt bei geschlossenem Schalter S2 der Strom nicht mehr über die Widerstände R2a, R3 zu dem Heizwiderstand R1, sondern direkt über den Schalter S2. Damit fließt ein größerer Strom über den Heizwiderstand R1, was eine Erhöhung der Heizleistung des Heizwiderstands R1 darstellt.At the same time, when the switch S2 is closed, the current no longer flows via the resistors R2a, R3 to the heating resistor R1, but directly via the switch S2. Thus, a larger current flows through the heating resistor R1, which represents an increase in the heating power of the heating resistor R1.

Durch das Schließen des Schalters S2 wird die Schaltungsanordnung 10 somit von einer ersten in eine zweite Leistungsstufe umgeschaltet, wobei in der zweiten Stufe die Drehzahl des Elektromotors M und die Heizleistung des Heizwiderstand R1 erhöht ist. Die Drehzahl des Elektromotors M und die Heizleistung des Heizwiderstands R1 in den beiden Stufen können dabei durch eine entsprechende Dimensionierung der Widerstände R1, R2a, R2b, R3 eingestellt werden.By closing the switch S2, the circuit 10 is thus switched from a first to a second power level, wherein in the second stage, the speed of the electric motor M and the heating power of the heating resistor R1 is increased. The speed of the electric motor M and the heating power of the heating resistor R1 in the two stages can be adjusted by a corresponding dimensioning of the resistors R1, R2a, R2b, R3.

In der Figur 2 ist eine zweite Schaltungsanordnung 15 dargestellt, die weitgehend mit der Schaltungsanordnung 10 der Figur 1 übereinstimmt. Gleichartige Bauelemente sind deshalb mit gleichen Bezugszeichen gekennzeichnet. Der wesentliche Unterschied zwischen der Schaltungsanordnung 15 der Figur 2 und der Schaltungsanordnung 10 der Figur 1 besteht darin, dass der Widerstand R3 der Figur 1 durch einen Kondensator C1 in der Figur 2 ersetzt ist.FIG. 2 shows a second circuit arrangement 15, which largely corresponds to the circuit arrangement 10 of FIG. Similar components are therefore identified by the same reference numerals. The essential difference between the circuit arrangement 15 of FIG. 2 and the circuit arrangement 10 of FIG. 1 is that the resistor R3 of FIG. 1 is replaced by a capacitor C1 in FIG.

Die Funktionsweise der Schaltungsanordnung 15 der Figur 2 stimmt im wesentlichen mit der Funktionsweise der Schaltungsanordnung 10 der Figur 1 überein. Wie bei der Figur 1, so wird auch die Schaltungsanordnung 15 der Figur 2 durch das Schließen des Schalters S2 von einer ersten in eine zweite Leistungsstufe umgeschaltet, wobei in der zweiten Stufe die Drehzahl des Elektromotors M und die Heizleistung des Heizwiderstand R1 erhöht ist.The mode of operation of the circuit arrangement 15 of FIG. 2 corresponds essentially to the mode of operation of the circuit arrangement 10 of FIG. As in the case of FIG. 1, the circuit arrangement 15 of FIG. 2 is also switched from a first to a second power stage by closing the switch S2, the speed of the electric motor M and the heating power of the heating resistor R1 being increased in the second stage.

Der wesentliche Unterschied, der durch die Verwendung des Kondensators C1 anstelle des Widerstands R3 erreicht wird, besteht darin, dass der Kondensator C1 keinen Einfluss hat auf die Heizleistung des Heizwiderstands R1 bei geöffnetem Schalter S2 oder auf die Drehzahl des Elektromotors M bei geschlossenem Schalter S2. Für den Wechselstrom stellt der Kondensator C1 insoweit einen Kurzschluss dar. Die Drehzahl des Elektromotors M und die Heizleistung des Heizwiderstands R1 in den beiden Leistungsstufen können damit durch eine entsprechende Dimensionierung der Widerstände R1, R2a, R2b eingestellt werden.The essential difference achieved by using the capacitor C1 instead of the resistor R3 is that the capacitor C1 has no influence on the heating power of the heating resistor R1 when the switch S2 is open or on the speed of the electric motor M when the switch S2 is closed. For the alternating current, the capacitor C1 is so far a short circuit. The speed of the electric motor M and the heating power of the heating resistor R1 in the two power levels can thus be adjusted by a corresponding dimensioning of the resistors R1, R2a, R2b.

In der Figur 3 ist eine dritte Schaltungsanordnung 16 dargestellt, die weitgehend mit der Schaltungsanordnung 10 der Figur 1 übereinstimmt. Gleichartige Bauelemente sind deshalb mit gleichen Bezugszeichen gekennzeichnet. Der wesentliche Unterschied zwischen der Schaltungsanordnung 16 der Figur 3 und der Schaltungsanordnung 10 der Figur 1 besteht darin, dass der Widerstand R3 der Figur 1 durch eine Diode D5 in der Figur 3 ersetzt ist. Die Durchlassrichtung der Diode D5 ist dabei in Richtung zu den beiden Widerständen R2a, R2b geschaltet.FIG. 3 shows a third circuit arrangement 16, which largely corresponds to the circuit arrangement 10 of FIG. Similar components are therefore identified by the same reference numerals. The essential difference between the circuit arrangement 16 of FIG. 3 and the circuit arrangement 10 of FIG. 1 is that the resistor R3 of FIG. 1 is replaced by a diode D5 in FIG. The forward direction of the diode D5 is connected in the direction of the two resistors R2a, R2b.

Bei geöffnetem Schalter S2 fließt ein Wechselstrom über die Diodenbrücke und damit über den Elektromotor M sowie über die beiden Widerstände R2a, R2b. Der Elektromotor M ist damit eingeschaltet. Die Drehzahl des Elektromotors M hängt von dem über die beiden Widerstände R2a, R2b fließenden Strom und damit von den Werten dieser beiden Widerstände R2a, R2b ab.When the switch S2 is open, an alternating current flows through the diode bridge and thus via the electric motor M and via the two resistors R2a, R2b. The electric motor M is turned on. The rotational speed of the electric motor M depends on the current flowing through the two resistors R2a, R2b and thus on the values of these two resistors R2a, R2b.

Weiterhin fließt eine der beiden Halbwellen des Wechselstroms über den Heizwiderstand R1, die Diode D5 und den Widerstand R2a. Die abgegebene Heizleistung des Heizwiderstands R1 hängt damit von den Werten des Heizwiderstands R1 und des Widerstands R2a ab.Furthermore, one of the two half-waves of the alternating current flows through the heating resistor R1, the diode D5 and the resistor R2a. The output heating power of the heating resistor R1 thus depends on the values of the heating resistor R1 and the resistor R2a.

Wird der Schalter S2 geschlossen, so fließt der Strom nicht mehr über den Widerstand R2a allein, sondern eine der beiden Halbwellen des Wechselstroms fließt zusätzlich über die Diode D5 zu der Diodenbrücke und damit zu dem Elektromotor M. Damit fließt ein größerer Strom über den Elektromotor M, was gleichbedeutend damit ist, dass die Drehzahl des Elektromotors M erhöht ist.If the switch S2 is closed, the current no longer flows through the resistor R2a alone, but one of the two half-waves of the alternating current additionally flows through the diode D5 to the diode bridge and thus to the electric motor M. Thus, a larger current flows through the electric motor M. , which is synonymous with the fact that the rotational speed of the electric motor M is increased.

Gleichzeitig fließt bei geschlossenem Schalter S2 der Strom nicht mehr über den Widerstand R2a zu dem Heizwiderstand R1, sondern direkt über den Schalter S2. Damit fließt ein größerer Strom über den Heizwiderstand R1, was eine Erhöhung der Heizleistung des Heizwiderstands R1 darstellt.At the same time, when the switch S2 is closed, the current no longer flows via the resistor R2a to the heating resistor R1, but directly via the switch S2. This flows in greater current through the heating resistor R1, which represents an increase in the heating power of the heating resistor R1.

Durch das Schließen des Schalters S2 wird die Schaltungsanordnung 16 somit von einer ersten in eine zweite Leistungsstufe umgeschaltet, wobei in der zweiten Stufe die Drehzahl des Elektromotors M und die Heizleistung des Heizwiderstand R1 erhöht ist.By closing the switch S2, the circuit 16 is thus switched from a first to a second power level, wherein in the second stage, the speed of the electric motor M and the heating power of the heating resistor R1 is increased.

Die Drehzahl des Elektromotors M und die Heizleistung des Heizwiderstands R1 in den beiden Stufen können dabei durch eine entsprechende Dimensionierung der Widerstände R1, R2a, R2b eingestellt werden. Bei dieser Dimensionierung ist jedoch zusätzlich zu beachten, dass bei der Heizleistung des Heizwiderstands R1 bei geöffneten Schalter S2 nur eine Halbwelle des Wechselstroms zur Wirkung kommt, und dass entsprechendes bei geschlossenem Schalter S2 auch für die Drehzahl des Elektromotors M gilt.The speed of the electric motor M and the heating power of the heating resistor R1 in the two stages can be adjusted by a corresponding dimensioning of the resistors R1, R2a, R2b. In this dimensioning, however, is also to be noted in addition that in the heating power of the heating resistor R1 with open switch S2 only a half-wave of the alternating current comes into effect, and that corresponding with closed switch S2 also applies to the speed of the electric motor M.

In der Figur 4 ist eine vierte Schaltungsanordnung 17 dargestellt, die weitgehend mit der Schaltungsanordnung 16 der Figur 3 übereinstimmt. Gleichartige Bauelemente sind deshalb mit gleichen Bezugszeichen gekennzeichnet. Der wesentliche Unterschied zwischen der Schaltungsanordnung 17 der Figur 4 und der Schaltungsanordnung 16 der Figur 3 besteht darin, dass zwei Dioden D5, D6 und zwei Heizwiderstände R1a, R1b vorgesehen sind. Die beiden Dioden D5, D6 sind in Serie zwischen den Verbindungspunkt der beiden Widerstände R2a, R2b und den Verbindungspunkt des Heizwiderstands R1 b und des Schalters S2 geschaltet. Die Durchlassrichtung der Dioden D5, D6 ist in Richtung zu den beiden Widerständen R2a, R2b geschaltet. Die beiden Heizwiderstände R1a, R2b sind parallel geschaltet. Der Heizwiderstand R1 a ist an den Verbindungspunkt der beiden Dioden D5, D6 angeschlossen und der Heizwiderstand R1 b ist mit dem Schalter S2 verbunden.FIG. 4 shows a fourth circuit arrangement 17, which largely corresponds to the circuit arrangement 16 of FIG. Similar components are therefore identified by the same reference numerals. The essential difference between the circuit arrangement 17 of FIG. 4 and the circuit arrangement 16 of FIG. 3 is that two diodes D5, D6 and two heating resistors R1a, R1b are provided. The two diodes D5, D6 are connected in series between the connection point of the two resistors R2a, R2b and the connection point of the heating resistor R1b and the switch S2. The forward direction of the diodes D5, D6 is connected in the direction of the two resistors R2a, R2b. The two heating resistors R1a, R2b are connected in parallel. The heating resistor R1 a is connected to the connection point of the two diodes D5, D6 and the heating resistor R1b is connected to the switch S2.

Bei geöffnetem Schalter S2 fließt ein Wechselstrom über die Diodenbrücke und damit über den Elektromotor M sowie über die beiden Widerstände R2a, R2b. Der Elektromotor M ist damit eingeschaltet. Die Drehzahl des Elektromotors M hängt von dem über die beiden Widerstände R2a, R2b fließenden Strom und damit von den Werten dieser beiden Widerstände R2a, R2b ab.When the switch S2 is open, an alternating current flows through the diode bridge and thus via the electric motor M and via the two resistors R2a, R2b. The electric motor M is turned on. The rotational speed of the electric motor M depends on the current flowing through the two resistors R2a, R2b and thus on the values of these two resistors R2a, R2b.

Weiterhin fließt eine der beiden Halbwellen des Wechselstroms über die beiden Heizwiderstände R1a, R1b, die Dioden D5, D6 und den Widerstand R2a. Die abgegebene Heizleistung der Heizwiderstände R1a, R1b hängt damit von den Werten der Heizwiderstände R1a, R1b und des Widerstands R2a ab.Furthermore, one of the two half-waves of the alternating current flows through the two heating resistors R1a, R1b, the diodes D5, D6 and the resistor R2a. The output heating power of the heating resistors R1a, R1b thus depends on the values of the heating resistors R1a, R1b and the resistor R2a.

Wird der Schalter S2 geschlossen, so fließt der Strom nicht mehr über den Widerstand R2a allein, sondern eine der beiden Halbwellen des Wechselstroms fließt zusätzlich über die Dioden D5, D5 zu der Diodenbrücke und damit zu dem Elektromotor M. Damit fließt ein grö-ßerer Strom über den Elektromotor M, was gleichbedeutend damit ist, dass die Drehzahl des Elektromotors M erhöht ist.If the switch S2 is closed, the current is no longer flowing through the resistor R2a alone, but one of the two half-waves of the alternating current flows through the diodes D5, D5 to the diode bridge and thus to the electric motor M. Thus, a greater current flows via the electric motor M, which is synonymous with the fact that the rotational speed of the electric motor M is increased.

Gleichzeitig fließt bei geschlossenem Schalter S2 der Strom nicht mehr über den Widerstand R2a zu den beiden Heizwiderständen R1a, R1b, sondern direkt über den Schalter S2. Dabei gelangt eine der beiden Halbwellen des Wechselstroms über die Diode D6 zu den beiden Heizwiderständen R1a, R1b. Damit fließt ein größerer Strom über die Heizwiderstände R1a, R1b, was eine Erhöhung der Heizleistung der Heizwiderstände R1a, R1b darstellt.At the same time, when the switch S2 is closed, the current no longer flows via the resistor R2a to the two heating resistors R1a, R1b, but directly via the switch S2. In this case, one of the two half-waves of the alternating current passes through the diode D6 to the two heating resistors R1a, R1b. Thus, a larger current flows through the heating resistors R1a, R1b, which represents an increase in the heating power of the heating resistors R1a, R1b.

Durch das Schließen des Schalters S2 wird die Schaltungsanordnung 16 somit von einer ersten in eine zweite Leistungsstufe umgeschaltet, wobei in der zweiten Stufe die Drehzahl des Elektromotors M und die Heizleistung der Heizwiderstände R1a, R1b erhöht ist.By closing the switch S2, the circuit 16 is thus switched from a first to a second power level, wherein in the second stage, the speed of the electric motor M and the heating power of the heating resistors R1a, R1b is increased.

Die Drehzahl des Elektromotors M und die Heizleistung der Heizwiderstände R1a, R1b in den beiden Stufen können dabei durch eine entsprechende Dimensionierung der Widerstände R1a, R1b, R2a, R2b eingestellt werden. Bei dieser Dimensionierung ist jedoch zusätzlich zu beachten, dass bei der Heizleistung der Heizwiderstände R1a, R1b nur eine Halbwelle des Wechselstroms zur Wirkung kommt, und dass entsprechendes bei geschlossenem Schalter S2 auch für die Drehzahl des Elektromotors M gilt.The speed of the electric motor M and the heating power of the heating resistors R1a, R1b in the two stages can be adjusted by a corresponding dimensioning of the resistors R1a, R1b, R2a, R2b. In this dimensioning, however, is also to be noted in addition that in the heating power of the heating resistors R1a, R1b only one half-wave of the alternating current comes into effect, and that corresponding with closed switch S2 also applies to the speed of the electric motor M.

Weiterhin kann bei den Schaltungsanordnungen 16, 17 der Figuren 3, 4 die Drehzahl des Elektromotors M sowie die Heizleistung des bzw. der Heizwiderstände R1, R1a, R1b in den beiden Stufen durch eine entsprechende Wahl der Durchflussrichtungen der Dioden D5, D6 beeinflusst werden.Furthermore, in the circuit arrangements 16, 17 of FIGS. 3, 4, the rotational speed of the electric motor M and the heating power of the heating resistor or resistors R1, R1a, R1b in the two stages can be influenced by an appropriate choice of the flow directions of the diodes D5, D6.

Das beschriebene Vorgehen kann in entsprechender Weise auch für eine dritte Leistungsstufe oder ganz allgemein für weitere Leistungsstufen der Drehzahl des Elektromotors M und der Heizleistung des bzw. der Heizwiderstände R1, R1 a, R1 b angewendet werden.The described procedure can be applied in a corresponding manner also for a third power stage or in general for further power stages of the rotational speed of the electric motor M and the heating power of the heating resistor or resistors R1, R1a, R1b.

Die beschriebenen Schaltungsanordnungen 10, 16, 17, 18 können somit mit dem Schalter S2 hinsichtlich der Drehzahl des Elektromotors M und der Heizleistung des bzw. der Heizwiderstände R1, R1 a, R1 b zwischen zwei Leistungsstufen hin- und hergeschaltet werden.The described circuit arrangements 10, 16, 17, 18 can thus be switched back and forth with the switch S2 with respect to the rotational speed of the electric motor M and the heating power of the heating resistor or resistors R1, R1a, R1b between two power levels.

Claims (8)

  1. An electric circuit arrangement (10, 15, 16, 17) in a hair care device, with an electric motor (M) that can be connected to a voltage via a resistor (R2a, R2b), and with a heating resistor (R1, R1a, R1b) that can also be connected to the voltage, wherein the electric motor (M) and the resistor (R2a, R2b) form a series circuit, wherein an on/off switch (S2) and the heating resistor (R1, R1a, R1b) form a series circuit, and wherein the two series circuits are connected in parallel and the junction of the on/off switch (S2) and the heating resistor (R1, R1a, R1b) is connected to the resistor (R2a, R2b) by means of an additional electric component, characterized in that the resistor (R2a, R2b) is divided, and in that the additional electric component is connected in an electrically conductive fashion to the junction of the divided resistor (R2a, R2b) and to the junction of the on/off switch (S2) and the heating resistor (R1, R1a, R1b).
  2. The circuit arrangement (10) according to Claim 1, characterized in that a resistor (R3) is provided as additional electric component (Figure 1).
  3. The circuit arrangement (15) according to Claim 1, characterized in that a capacitor (C1) is provided as additional electric component (Figure 2).
  4. The circuit arrangement (16) according to Claim 1, characterized in that a diode (D5) is provided as additional electric component (Figure 3).
  5. The circuit arrangement (16) according to Claim 4, characterized in that the conducting direction of the diode (D5) is switched in the direction toward the resistor (R2a, R2b).
  6. The circuit arrangement (17) according to Claim 1, characterized in that two heating resistors (R1a, R1b) are provided, and in that two diodes (D5, D6) are provided as additional electric component (Figure 4).
  7. The circuit arrangement (17) according to Claim 6, characterized in that the two heating resistors (R1a, R1b) are connected in parallel, and in that the conducting directions of the two diodes (D5, D6) are switched in the direction toward the resistor (R2a, R2b).
  8. The circuit arrangement (10, 15, 16, 17) according to one of the preceding claims, characterized in that the electric motor (M) is arranged in the central arm of a diode bridge, and in that the electric motor (M) and the heating resistor (R1, R1a, R1b) can be connected to an alternating voltage.
EP04010958A 2003-05-28 2004-05-07 Electrical circuit arrangement in a hair care device Not-in-force EP1482764B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10324510 2003-05-28
DE10324510A DE10324510A1 (en) 2003-05-28 2003-05-28 Electrical circuitry in a hair care device

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EP1482764A1 EP1482764A1 (en) 2004-12-01
EP1482764B1 true EP1482764B1 (en) 2007-02-28

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AT (1) ATE355721T1 (en)
DE (2) DE10324510A1 (en)

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Publication number Priority date Publication date Assignee Title
DE202006020406U1 (en) * 2006-12-01 2008-07-31 Göckeritz, Stephan Mobile hot air hot air device for operation with rechargeable batteries

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4003388A (en) * 1976-04-01 1977-01-18 General Electric Company Hair dryer variable control
DE2735420A1 (en) * 1977-08-05 1979-02-15 Otto Huebner Electric hair fan dryer with three speed switch - has separate safety switch operated without affecting setting of first switch speed
NL8005531A (en) * 1980-10-07 1982-05-03 Philips Nv Hand-held hair-drier - has additional short duration booster heating element in circuit with bimetallic heating element
DE3101057C2 (en) * 1981-01-15 1985-05-09 Braun Ag, 6000 Frankfurt Electrical circuit for the multi-stage operation of heating resistors
DE19634420C2 (en) * 1996-08-26 2000-10-26 Braun Gmbh Electric heater and electric hair dryer

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ATE355721T1 (en) 2006-03-15
DE502004003003D1 (en) 2007-04-12
EP1482764A1 (en) 2004-12-01

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