EP1327291A1 - Small electronic device comprising an accumulator and a user - Google Patents

Small electronic device comprising an accumulator and a user

Info

Publication number
EP1327291A1
EP1327291A1 EP01988965A EP01988965A EP1327291A1 EP 1327291 A1 EP1327291 A1 EP 1327291A1 EP 01988965 A EP01988965 A EP 01988965A EP 01988965 A EP01988965 A EP 01988965A EP 1327291 A1 EP1327291 A1 EP 1327291A1
Authority
EP
European Patent Office
Prior art keywords
electrical appliance
small electrical
accumulator
consumer
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01988965A
Other languages
German (de)
French (fr)
Inventor
Uwe Katzer
Peter Trawinski
Lothar Paecher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Braun GmbH
Original Assignee
Braun GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Braun GmbH filed Critical Braun GmbH
Publication of EP1327291A1 publication Critical patent/EP1327291A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply

Definitions

  • the invention relates to a small electrical device with a single or multi-cell battery and a consumer that can be supplied by an external energy source.
  • an accumulator-operated device with an electronic circuit and an accumulator which can be charged by a charging device.
  • the case may occur that the voltage delivered by the charging device collapses when the accumulator is discharged.
  • the electronic circuit can nevertheless be supplied with a sufficiently high voltage from a capacitor which is charged by the charging device via a diode.
  • an electronic switch interrupts the charging process of the accumulator briefly again and again, which relieves the charging device and increases its voltage, so that the capacitor is charged via the diode.
  • the capacitor supplies the electronic circuit.
  • the capacitor is dimensioned so that its voltage drops only to a tolerable extent during its discharge.
  • a small electrical appliance according to the invention is provided with a control circuit for regulating the voltage supplied by the external energy source, the regulation preferably being carried out by changing the resistance of the charging circuit of the accumulator.
  • the control circuit preferably has a variable resistor, via which the accumulator can be charged by the external energy source. If, for example, the accumulator is deeply discharged, it takes up a very large charging current, as a result of which the voltage of the energy source and thus also the voltage at the consumer would collapse in the case of a high-resistance energy source.
  • the control circuit ensures, however, that the consumer always has at least a certain minimum Voltage is present.
  • the control circuit detects the voltage supplied by the energy source or the voltage applied to the consumer. The latter case is particularly advantageous if the consumer is supplied from the energy source, for example, via a voltage boost circuit.
  • the variable resistor preferably consists of at least one transistor which can be controlled by the control circuit and by means of which the resistance of the charging circuit of the accumulator can be changed continuously or in steps.
  • the consumer can be supplied directly by the accumulator or via a voltage boost circuit.
  • Fig. 1 shows a first small electrical appliance with a first circuit arrangement according to the invention
  • Fig. 2 shows a second small electrical appliance with a second invention
  • Fig. 3 shows a third small electrical appliance with a third circuit arrangement according to the invention.
  • the first small electrical appliance 10 shown schematically in FIG. 1, has two connections 1, 2, which can be connected to an energy source (not shown in the figure), for example a charger.
  • the small electrical appliance 10 also contains an accumulator 3, a control circuit 4 and a consumer 5, which is connected to the connections 1, 2.
  • the control circuit 4 has an input 41 which is connected to one connection, an output 42 and a power supply connection 43 which is connected to the other connection.
  • the output 42 of the control circuit is with the consumer 5 and with one pole of the Accumulator 3 connected, the other pole of which is connected to one of the connections 1, 2.
  • the consumer 5 is designed so that it is operated with the higher of the available operating voltages, ie either with the voltage of the accumulator 3 or with the supply voltage supplied by the energy source.
  • the control circuit 4 contains, in a manner known per se, a reference voltage source which generates a reference voltage from the supply voltage present between its input 41 and its power supply connection 43, and a comparator which compares the reference voltage with the supply voltage and whose output signal sets a variable resistance , for example the collector-emitter resistance of a bipolar transistor or the source-drain resistance of a field effect transistor which is connected between the input 41 and the output 42 of the control circuit.
  • the control circuit is designed so that the value of the variable resistor is set so that the voltage applied to its input 41 does not fall below a minimum voltage. It is also designed so that the variable resistance takes its maximum value when the voltage at input 41 is minimal, i.e. especially zero.
  • the second small electrical appliance 20 differs from the first small electrical appliance 10 shown in FIG. 1 by a voltage boost circuit 6 and a capacitor 7.
  • the control circuit 4 has a second input 44, which is connected to the consumer by a connection point 5 and the booster circuit 6 is connected, the booster circuit 6 being connected between the connection point and the one connection, and the consumer 5 between the connection point and the other connection.
  • the capacitor 7 is connected in parallel to the load 5.
  • the output 42 of the control circuit is not connected to the load 5 but to the voltage boost circuit 6 and to one pole of the accumulator 3, the other pole of which is connected to one of the connections 1, 2.
  • the voltage increasing circuit 6 is designed such that it either increases the voltage of the accumulator 3 or the supply voltage supplied by the energy source, namely the larger of the two voltages.
  • the second small electrical appliance 20 has the 10 compared to the first small electrical appliance Advantage that, due to the voltage boost circuit 6, the consumer 5 has a higher operating voltage available, which is also smoothed by the capacitor 7.
  • the latter is always advantageous if the supply voltage supplied by the energy source is a rectified AC voltage which has a corresponding ripple. It is also advantageous for the accuracy of the control if the control circuit now ensures that it is not the supply voltage applied to the first input 41 but the operating voltage applied to the second input 44 that does not drop below the determined minimum voltage.
  • the reference voltage can be generated from the higher operating voltage instead of from the supply voltage present at the connections 1, 2.
  • the third small electrical appliance 30 according to the invention differs from the second small electrical appliance 20 shown in FIG. 2 only by a load 8, which is connected in parallel to the battery 3, and can be switched on and off by the consumer 5.
  • the consumer 5 consists of an electronic circuit
  • the load 8 consists of a series circuit comprising a DC motor and a controllable switch, in particular a field effect transistor which can be controlled by the electronic circuit.
  • the electronic circuit is preferably integrated in a semiconductor chip together with the control circuit 4, the voltage boost circuit 6 and, if appropriate, the controllable switch.
  • variable resistor consists of several transistors, whose collector-emitter paths or source-drain paths between the input 41 and the output 42 of the control circuit, i.e. are connected in parallel.
  • the transistors are controlled by the control circuit either in a conductive or non-conductive manner, the resistances of these paths being selected to be of different sizes in the conductive state.
  • the effective resistance between the input 41 and the output 42 can therefore be changed in stages by either driving only one transistor with a large or one with a small path resistance, or driving several or all of the transistors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a small electronic device (10), comprising an accumulator (3) and a user (5), which may be supplied from an electrical energy source, for which the accumulator represents a first load and the user a second load. Said small electronic device has a regulator circuit (4), for the regulation of the voltage delivered by the energy source, whereby the regulation is preferably achieved by means of altering the resistance of the charging current circuit of the accumulator.

Description

Elektrokleingerät mit einem Akkumulator und einem Verbraucher Small electrical appliance with an accumulator and a consumer
Die Erfindung betrifft ein Elektrokleingerät mit einem ein- oder mehrzelligen Akkumulator und einem Verbraucher, das von einer externen Energiequelle versorgt werden kann.The invention relates to a small electrical device with a single or multi-cell battery and a consumer that can be supplied by an external energy source.
Aus der EP 0 875 978 ist ein Akkumulator-betriebenes Gerät mit einer elektronischen Schaltung und einem Akkumulator bekannt, der durch eine Ladevorrichtung aufgeladen werden kann. Dabei kann der Fall auftreten, daß bei entladenem Akkumulator die von der Ladevorrichtung gelieferte Spannung zusammenbricht. Während des Ladevorgangs des Akkumulators kann die elektronische Schaltung trotzdem mit einer genügend hohen Spannung aus einem Kondensator versorgt werden, der über eine Diode von der Ladevorrichtung aufgeladen wird. Um dies zu erreichen, unterbricht ein elektronischer Schalter nämlich den Ladevorgang des Akkumulators immer wieder kurzzeitig, wodurch die Ladevorrichtung entlastet wird, und deren Spannung ansteigt, sodaß über die Diode der Kondensator geladen wird. Während des Ladevorgangs des Akkumulators versorgt also der Kondensator die elektronische Schaltung. Der Kondensator ist so dimensioniert, daß seine Spannung während seiner Entladung nur in einem tolerierbaren Umfang sinkt.From EP 0 875 978 an accumulator-operated device with an electronic circuit and an accumulator is known, which can be charged by a charging device. The case may occur that the voltage delivered by the charging device collapses when the accumulator is discharged. During the charging process of the accumulator, the electronic circuit can nevertheless be supplied with a sufficiently high voltage from a capacitor which is charged by the charging device via a diode. In order to achieve this, an electronic switch interrupts the charging process of the accumulator briefly again and again, which relieves the charging device and increases its voltage, so that the capacitor is charged via the diode. During the charging process of the battery, the capacitor supplies the electronic circuit. The capacitor is dimensioned so that its voltage drops only to a tolerable extent during its discharge.
Es ist Aufgabe der vorliegenden Erfindung, ein Elektrokleingerät mit einem Akkumulator und einem Verbraucher anzugeben, bei dem eine kontinuierliche Versorgung des Akkumulators mit einem Ladestrom und des Verbrauchers mit einer ausreichend hohen Spannung auch durch eine hochohmige externe Energiequelle möglich ist.It is an object of the present invention to provide a small electrical appliance with a rechargeable battery and a consumer, in which a continuous supply of the rechargeable battery with a charging current and the consumer with a sufficiently high voltage is also possible by means of a high-resistance external energy source.
Zur Lösung dieser Aufgabe ist ein erfindungsgemäßes Elektrokleingerät mit einer Regelschaltung zur Regelung der von der externen Energiequelle gelieferten Spannung versehen, wobei die Regelung vorzugsweise durch Verändern des Widerstands des Ladestromkreises des Akkumulators erfolgt.To achieve this object, a small electrical appliance according to the invention is provided with a control circuit for regulating the voltage supplied by the external energy source, the regulation preferably being carried out by changing the resistance of the charging circuit of the accumulator.
Die Regelschaltung weist vorzugsweise einen veränderbaren Widerstand auf, über den der Akkumulator von der externen Energiequelle geladen werden kann. Ist beispielsweise der Akkumulator tiefentladen, nimmt er einen sehr großen Ladestrom auf, wodurch bei einer hochohmigen Energiequelle die Spannung der Energiequelle und damit auch die Spannung am Verbraucher zusammenbrechen würde. Durch die Regelschaltung, wird jedoch dafür gesorgt, daß am Verbraucher immer zumindest eine bestimmte Mindest- Spannung anliegt. Um den veränderbaren Widerstand richtig einzustellen, erfaßt die Regelschaltung die von der Energiequelle gelieferte Spannung oder die am Verbraucher anliegende Spannung. Der letztgenannte Fall ist dann besonders vorteilhaft, wenn der Verbraucher beispielsweise über eine Spannungserhöhungsschaltung aus der Energiequelle versorgt wird. Der veränderbare Widerstand besteht vorzugsweise aus mindestens einem Transistor, der durch die Regelschaltung ansteuerbar ist, und durch den der Widerstand des Ladestromkreises des Akkumulators stufenlos oder in Stufen veränderbar ist.The control circuit preferably has a variable resistor, via which the accumulator can be charged by the external energy source. If, for example, the accumulator is deeply discharged, it takes up a very large charging current, as a result of which the voltage of the energy source and thus also the voltage at the consumer would collapse in the case of a high-resistance energy source. The control circuit ensures, however, that the consumer always has at least a certain minimum Voltage is present. In order to set the variable resistance correctly, the control circuit detects the voltage supplied by the energy source or the voltage applied to the consumer. The latter case is particularly advantageous if the consumer is supplied from the energy source, for example, via a voltage boost circuit. The variable resistor preferably consists of at least one transistor which can be controlled by the control circuit and by means of which the resistance of the charging circuit of the accumulator can be changed continuously or in steps.
Ist die Energiequelle nicht mit dem Elektrokleingerät verbunden, kann der Verbraucher direkt oder über eine Spannungserhöhungsschaltung vom Akkumulator versorgt werden.If the energy source is not connected to the small electrical appliance, the consumer can be supplied directly by the accumulator or via a voltage boost circuit.
Die Erfindung wird nachstehend anhand von Ausführungsbeispielen für erfindungsgemäße Elektrokleingeräte erläutert, bei denen es sich beispielsweise um elektrische Rasierapparate, elektrische Zahnbürsten, Geräte der Unterhaltungselektronik oder Datenübertragung oder -Verarbeitung handeln kann, die in den Zeichnungen schematisch dargestellt sind, wobei gleiche Bauteile mit denselben Bezugszeichen versehen sind. Weitere Ausgestaltungen sind in der Beschreibung beschrieben.The invention is explained below on the basis of exemplary embodiments for small electrical appliances according to the invention, which can be, for example, electric shavers, electric toothbrushes, consumer electronics devices or data transmission or processing, which are shown schematically in the drawings, the same components being provided with the same reference symbols are. Further configurations are described in the description.
Fig. 1 zeigt ein erstes Elektrokleingerät mit einer ersten erfindungsgemäßen Schaltungsanordnung;Fig. 1 shows a first small electrical appliance with a first circuit arrangement according to the invention;
Fig. 2 zeigt ein zweites Elektrokleingerät mit einer zweiten erfindungsgemäßenFig. 2 shows a second small electrical appliance with a second invention
Schaltungsanordnung;Circuitry;
Fig. 3 zeigt ein drittes Elektrokleingerät mit einer dritten erfindungsgemäßen Schaltungsanordnung.Fig. 3 shows a third small electrical appliance with a third circuit arrangement according to the invention.
Das in Fig. 1 schematisch dargestellte erste erfindungsgemäße Elektrokleingerät 10 weist zwei Anschlüsse 1 , 2 auf, die mit einer in der Figur nicht dargestellten Energiequelle, beispielsweise einem Ladegerät, verbunden werden können. Das Elektrokleingerät 10 enthält ferner einen Akkumulator 3, eine Regelschaltung 4 und einen Verbraucher 5, der mit den Anschlüssen 1 , 2 verbunden ist. Die Regelschaltung 4 weist einen Eingang 41 , der mit dem einen Anschluß verbunden ist, einen Ausgang 42 und einen Stromversorgungsanschluß 43 auf, der mit dem anderen Anschluß verbunden ist. Der Ausgang 42 der Regelschaltung ist mit dem Verbraucher 5 und mit dem einen Pol des Akkumulators 3 verbunden, dessen anderer Pol mit einem der Anschlüsse 1 , 2 verbunden ist. Der Verbraucher 5 ist so ausgestaltet, daß er mit der höheren der zur Verfügung stehenden Betriebsspannungen betrieben wird, d.h. entweder mit der Spannung des Akkumulators 3 oder mit der von der Energiequelle gelieferten Versorgungsspannung.The first small electrical appliance 10 according to the invention, shown schematically in FIG. 1, has two connections 1, 2, which can be connected to an energy source (not shown in the figure), for example a charger. The small electrical appliance 10 also contains an accumulator 3, a control circuit 4 and a consumer 5, which is connected to the connections 1, 2. The control circuit 4 has an input 41 which is connected to one connection, an output 42 and a power supply connection 43 which is connected to the other connection. The output 42 of the control circuit is with the consumer 5 and with one pole of the Accumulator 3 connected, the other pole of which is connected to one of the connections 1, 2. The consumer 5 is designed so that it is operated with the higher of the available operating voltages, ie either with the voltage of the accumulator 3 or with the supply voltage supplied by the energy source.
Die Regelschaltung 4 enthält in an sich bekannter Weise eine Referenzspannungsquelle, die aus der zwischen ihrem Eingang 41 und ihrem Stromversorgungsanschluß 43 anliegenden Versorgungsspannung eine Referenzspannung erzeugt, sowie einen Kompa- rator, der die Referenzspannung mit der Versorgungsspannung vergleicht, und dessen Ausgangssignal einen veränderbaren Widerstand einstellt, beispielsweise den Kollektor- Emitter-Widerstand eines Bipolartransistors oder den Source-Drain-Widerstand eines Feldeffekttransistors, der zwischen den Eingang 41 und den Ausgang 42 der Regelschaltung geschaltet ist. Die Regelschaltung ist so ausgelegt, daß der Wert des veränderbaren Widerstands so eingestellt wird, daß die an ihrem Eingang 41 anliegende Spannung eine Mindestspannung nicht unterschreitet. Sie ist ferner so ausgelegt, daß der veränderbare Widerstand dann seinen maximalen Wert annimmt, wenn die Spannung am Eingang 41 minimal, d.h. insbesondere Null, ist.The control circuit 4 contains, in a manner known per se, a reference voltage source which generates a reference voltage from the supply voltage present between its input 41 and its power supply connection 43, and a comparator which compares the reference voltage with the supply voltage and whose output signal sets a variable resistance , for example the collector-emitter resistance of a bipolar transistor or the source-drain resistance of a field effect transistor which is connected between the input 41 and the output 42 of the control circuit. The control circuit is designed so that the value of the variable resistor is set so that the voltage applied to its input 41 does not fall below a minimum voltage. It is also designed so that the variable resistance takes its maximum value when the voltage at input 41 is minimal, i.e. especially zero.
Das in Fig. 2 schematisch dargestellte zweite erfindungsgemäße Elektrokleingerät 20 unterscheidet sich von dem in Fig. 1 dargestellten ersten Elektrokleingerät 10 durch eine Spannungserhöhungsschaltung 6 und einen Kondensator 7. Außerdem weist die Regelschaltung 4 einen zweiten Eingang 44 auf, der mit einem Verbindungspunkt zwischen dem Verbraucher 5 und der Spannungserhöhungsschaltung 6 verbunden ist, wobei die Spannungserhöhungsschaltung 6 zwischen den Verbindungspunkt und den einen Anschluß, und der Verbraucher 5 zwischen den Verbindungspunkt und den anderen Anschluß geschaltet ist. Der Kondensator 7 liegt parallel zum Verbraucher 5. Der Ausgang 42 der Regelschaltung ist nicht mit dem Verbraucher 5 sondern mit der Spannungserhöhungsschaltung 6 und mit dem einen Pol des Akkumulators 3 verbunden, dessen anderer Pol mit einem der Anschlüsse 1 , 2 verbunden ist. Die Spannungserhöhungsschaltung 6 ist so ausgestaltet, daß sie entweder die Spannung des Akkumulators 3 oder die von der Energiequelle gelieferte Versorgungsspannung erhöht, und zwar die größere der beiden Spannungen.The second small electrical appliance 20 according to the invention, shown schematically in FIG. 2, differs from the first small electrical appliance 10 shown in FIG. 1 by a voltage boost circuit 6 and a capacitor 7. In addition, the control circuit 4 has a second input 44, which is connected to the consumer by a connection point 5 and the booster circuit 6 is connected, the booster circuit 6 being connected between the connection point and the one connection, and the consumer 5 between the connection point and the other connection. The capacitor 7 is connected in parallel to the load 5. The output 42 of the control circuit is not connected to the load 5 but to the voltage boost circuit 6 and to one pole of the accumulator 3, the other pole of which is connected to one of the connections 1, 2. The voltage increasing circuit 6 is designed such that it either increases the voltage of the accumulator 3 or the supply voltage supplied by the energy source, namely the larger of the two voltages.
Das zweite Elektrokleingerät 20 hat gegenüber dem ersten Elektrokleingerät 10 den Vorteil, daß wegen der Spannungserhöhungsschaltung 6 dem Verbraucher 5 eine höhere Betriebsspannung zur Verfügung steht, die darüberhinaus auch noch durch den Kondensator 7 geglättet wird. Letzteres ist immer dann vorteilhaft, wenn die von der Energiequelle gelieferte Versorgungsspannung eine gleichgerichtete Wechselspannung ist, die eine entsprechende Welligkeit aufweist. Auch für die Genauigkeit der Regelung ist es vorteilhaft, wenn die Regelschaltung jetzt dafür sorgt, daß nicht die am ersten Eingang 41 anliegende Versorgungsspannung sondern die am zweiten Eingang 44 anliegende Betriebsspannung nicht unter die bestimmte Minimalspannung absinkt. Außerdem kann die Referenzspannung statt aus der an den Anschlüssen 1 , 2 anliegenden Versorgungsspannung aus der höheren Betriebsspannung erzeugt werden.The second small electrical appliance 20 has the 10 compared to the first small electrical appliance Advantage that, due to the voltage boost circuit 6, the consumer 5 has a higher operating voltage available, which is also smoothed by the capacitor 7. The latter is always advantageous if the supply voltage supplied by the energy source is a rectified AC voltage which has a corresponding ripple. It is also advantageous for the accuracy of the control if the control circuit now ensures that it is not the supply voltage applied to the first input 41 but the operating voltage applied to the second input 44 that does not drop below the determined minimum voltage. In addition, the reference voltage can be generated from the higher operating voltage instead of from the supply voltage present at the connections 1, 2.
Das in Fig. 3 schematisch dargestellte dritte erfindungsgemäße Elektrokleingerät 30 unterscheidet sich von dem in Fig. 2 dargestellten zweiten Elektrokleingerät 20 lediglich durch eine Last 8, die parallel zum Akkumulator 3 geschaltet ist, und durch den Verbraucher 5 ein- und ausgeschaltet werden kann. Bei einer bevorzugten Ausführung eines erfindungsgemäßen Elektrokleingeräts, beispielsweise einer elektrischen Zahnbürste, besteht der Verbraucher 5 aus einer elektronischen Schaltung und die Last 8 aus einer Serienschaltung aus einem Gleichstrommotor und einem steuerbaren Schalter, insbesondere einem Feldeffekttransistor, der von der elektronischen Schaltung steuerbar ist. Die elektronische Schaltung ist vorzugsweise zusammen mit der Regelschaltung 4, der Spannungserhöhungsschaltung 6 und ggfs. dem steuerbaren Schalter in einem Halbleiter-Chip integriert.The third small electrical appliance 30 according to the invention, shown schematically in FIG. 3, differs from the second small electrical appliance 20 shown in FIG. 2 only by a load 8, which is connected in parallel to the battery 3, and can be switched on and off by the consumer 5. In a preferred embodiment of a small electrical appliance according to the invention, for example an electric toothbrush, the consumer 5 consists of an electronic circuit and the load 8 consists of a series circuit comprising a DC motor and a controllable switch, in particular a field effect transistor which can be controlled by the electronic circuit. The electronic circuit is preferably integrated in a semiconductor chip together with the control circuit 4, the voltage boost circuit 6 and, if appropriate, the controllable switch.
Bei anderen Ausführungen erfindungsgemäßer Regelschaltungen besteht der veränderbare Widerstand aus mehreren Transistoren, deren Kollektor-Emitter-Pfade bzw. Source- Drain-Pfade zwischen den Eingang 41 und den Ausgang 42 der Regelschaltung, d.h. einander parallel geschaltet sind. Die Transistoren werden durch die Regelschaltung entweder leitend oder nicht-leitend gesteuert, wobei im leitenden Zustand die Widerstände dieser Pfade unterschiedlich groß gewählt sind. Der zwischen dem Eingang 41 und dem Ausgang 42 wirksame Widerstand ist daher in Stufen veränderbar, indem entweder nur ein Transistor mit großem oder einer mit kleinem Pfad-Widerstand angesteuert wird, oder mehrere oder alle Transistoren angesteuert werden. In other embodiments of control circuits according to the invention, the variable resistor consists of several transistors, whose collector-emitter paths or source-drain paths between the input 41 and the output 42 of the control circuit, i.e. are connected in parallel. The transistors are controlled by the control circuit either in a conductive or non-conductive manner, the resistances of these paths being selected to be of different sizes in the conductive state. The effective resistance between the input 41 and the output 42 can therefore be changed in stages by either driving only one transistor with a large or one with a small path resistance, or driving several or all of the transistors.

Claims

Patentansprüche claims
1 . Elektrokleingerät mit einem Akkumulator und einem Verbraucher, das von einer elektrischen Energiequelle versorgbar ist, für die der Akkumulator eine erste Last und der Verbraucher eine zweite Last darstellt, dadurch gekennzeichnet, daß das Elektrokleingerät eine Regelschaltung (4) mit einem veränderbaren Widerstand aufweist, der von der Regelschaltung derart einstellbar ist, daß die von der Energiequelle gelieferte Spannung nicht unter eine bestimmte Minimalspannung absinkt.1 . Small electrical appliance with an accumulator and a consumer, which can be supplied by an electrical energy source for which the accumulator represents a first load and the consumer a second load, characterized in that the small electrical appliance has a control circuit (4) with a variable resistance, which the control circuit is adjustable such that the voltage supplied by the energy source does not drop below a certain minimum voltage.
2. Elektrokleingerät nach Anspruch 1 , dadurch gekennzeichnet, daß der veränderbare Widerstand im Ladestromkreis des Akkumulators (3) liegt.2. Small electrical appliance according to claim 1, characterized in that the variable resistance in the charging circuit of the battery (3).
3. Elektrokleingerät nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der veränderbare Widerstand aus mindestens einem Transistor besteht.3. Small electrical appliance according to claim 1 or 2, characterized in that the variable resistor consists of at least one transistor.
4. Elektrokleingerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß durch die Regelschaltung (4) die Größe des veränderbaren Widerstands stufenlos oder in Stufen veränderbar ist.4. Small electrical appliance according to one of claims 1 to 3, characterized in that the size of the variable resistor is infinitely variable or variable in stages by the control circuit (4).
5. Elektrokleingerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Verbraucher (5) über eine Spannungserhöhungsschaltung (6) aus der Energiequelle versorgbar ist.5. Small electrical appliance according to one of claims 1 to 4, characterized in that the consumer (5) via a boost circuit (6) can be supplied from the energy source.
6. Elektrokleingerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Regelschaltung (4) die am Verbraucher (5) anliegende oder die von der Energiequelle gelieferte Spannung erfaßt. 6. Small electrical appliance according to one of the preceding claims, characterized in that the control circuit (4) detects the voltage applied to the consumer (5) or the voltage supplied by the energy source.
7. Elektrokleingerät nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Verbraucher (5) auch vom Akkumulator (3) versorgt werden kann.7. Small electrical appliance according to one of the preceding claims, characterized in that the consumer (5) can also be supplied by the battery (3).
8. Elektrokleingerät nach Anspruch 7, dadurch gekennzeichnet, daß der Verbraucher (5) über die Spannungserhöhungsschaltung (6) aus dem Akkumulator (3) versorgbar ist. 8. Small electrical appliance according to claim 7, characterized in that the consumer (5) via the boost circuit (6) from the battery (3) can be supplied.
EP01988965A 2000-10-20 2001-10-11 Small electronic device comprising an accumulator and a user Withdrawn EP1327291A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10052374A DE10052374A1 (en) 2000-10-20 2000-10-20 Small electrical appliance with an accumulator and a consumer
DE10052374 2000-10-20
PCT/EP2001/011772 WO2002035678A1 (en) 2000-10-20 2001-10-11 Small electronic device comprising an accumulator and a user

Publications (1)

Publication Number Publication Date
EP1327291A1 true EP1327291A1 (en) 2003-07-16

Family

ID=7660665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01988965A Withdrawn EP1327291A1 (en) 2000-10-20 2001-10-11 Small electronic device comprising an accumulator and a user

Country Status (6)

Country Link
US (1) US20030128488A1 (en)
EP (1) EP1327291A1 (en)
JP (1) JP2004512795A (en)
AU (1) AU2002221669A1 (en)
DE (1) DE10052374A1 (en)
WO (1) WO2002035678A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD204360A1 (en) * 1981-10-20 1983-11-23 Gerhard Baerwinkel CIRCUIT ARRANGEMENT FOR LOADING NC ACCUMULATORS
DE3937875A1 (en) * 1989-11-14 1991-05-16 Braun Ag ELECTRICALLY OPERATED ORAL CARE DEVICE
US5585749A (en) * 1994-12-27 1996-12-17 Motorola, Inc. High current driver providing battery overload protection
US5637978A (en) * 1995-11-06 1997-06-10 Kendrick Products Corporation Battery booster
US5786682A (en) * 1996-08-07 1998-07-28 Reltec Corporation Battery charging circuit including a current limiter which compares a reference current to a charging current to ensure operation of a load
DE19838137A1 (en) * 1998-08-21 2000-03-02 Implex Hear Tech Ag Charger arrangement for rechargeable Ni Cd, Ni-metal hydride, or Lithium batteries in implant, has current source which provides high initial current

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0235678A1 *

Also Published As

Publication number Publication date
US20030128488A1 (en) 2003-07-10
WO2002035678A1 (en) 2002-05-02
JP2004512795A (en) 2004-04-22
DE10052374A1 (en) 2002-05-02
AU2002221669A1 (en) 2002-05-06

Similar Documents

Publication Publication Date Title
EP0241976B1 (en) Circuit arrangement to produce a dc voltage from a sinusoidal input voltage
EP0095072B1 (en) Electronic switching power supply
DE202018006738U1 (en) Power converter unit, plasma processing device and control device for controlling multiple plasma processes
DE2225094A1 (en) TRANSFORMERLESS DC VOLTAGE CONVERTER
DE69306185T2 (en) Stand-by supply circuit
CH619818A5 (en)
EP0247409B1 (en) Switching power supply having a primary chopping converter
DE3310678C2 (en) Circuit for regulating the output voltage of an electronic switched-mode power supply
AT410382B (en) Electronic circuit for fitting to a battery charging device connects an energy-supplying device to an energy source via terminals to convert energy from an AC voltage into a DC voltage and pass converted energy to a consumer.
DE10143726B4 (en) Vehicle generator controller
EP0030276B1 (en) Circuit arrangement for charging a battery
EP0057910A2 (en) Circuit for the regulated supply to a user
DE102010035278B4 (en) Circuit for reducing AC leakage current
DE102018128705A1 (en) Method and system for operating switching power converters based on a peak current through the switching element
DE19835667C2 (en) DC converter
EP1034611B1 (en) Constant current transformer
EP1327291A1 (en) Small electronic device comprising an accumulator and a user
DE10257908A1 (en) Clocked power supply
DE69602348T2 (en) POWER SUPPLY DEVICE WITH IMPROVED EFFICIENCY
DE2427402A1 (en) POWER SUPPLY ARRANGEMENT
EP0266743B1 (en) Circuit arrangement for producing an internal supply voltage in a switching current supply
EP0081880A2 (en) Control circuit for keeping the working voltage of an electricity consumer at a constant level
DE3418362C2 (en)
DE3311737C2 (en) Electronic switching power supply
DE1763542A1 (en) Battery charger for motor vehicles

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20021206

AK Designated contracting states

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20040502