EP0920266A1 - Circuit electrique pour assurer l'alimentation en courant - Google Patents

Circuit electrique pour assurer l'alimentation en courant

Info

Publication number
EP0920266A1
EP0920266A1 EP97938886A EP97938886A EP0920266A1 EP 0920266 A1 EP0920266 A1 EP 0920266A1 EP 97938886 A EP97938886 A EP 97938886A EP 97938886 A EP97938886 A EP 97938886A EP 0920266 A1 EP0920266 A1 EP 0920266A1
Authority
EP
European Patent Office
Prior art keywords
heating resistor
point
switch
circuit arrangement
electrical circuit
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.)
Granted
Application number
EP97938886A
Other languages
German (de)
English (en)
Other versions
EP0920266B1 (fr
Inventor
Boris Wonka
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 EP0920266A1 publication Critical patent/EP0920266A1/fr
Application granted granted Critical
Publication of EP0920266B1 publication Critical patent/EP0920266B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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 for an electrical consumer, in particular for an electric hair dryer, fan heater or the like, with two first and second resistors arranged in parallel to one another, at least one of which is a second heating resistor and the other in particular a first heating resistor, with a switch , with an AC voltage source being connectable to the resistors, and with a DC fan motor which is connected to one of the resistors via a rectifier circuit.
  • blower motor is connected to the middle branch of a diode bridge, which is connected on the one hand to taps of the two heating resistors and on the other hand to a pole of the supplying AC voltage source.
  • the two heating resistors are connected to the other pole of the AC voltage source via switch contacts. If only one switching contact is closed, one of the two heating resistors is flowed through by both half-waves of the alternating current, while only one half-wave is applied to the blower motor.
  • both switch contacts are closed, both heating resistors are flowed through by each two half-waves of the alternating current and the blower motor is also acted on by both half-waves. With only one switch contact closed, only part of the heating power and the blower power is available, while the total power is achieved in each case with both closed switch contacts.
  • the rectifier circuit has only two rectifiers arranged antiparallel, to the connection point of which one of the connection points of the direct current blower motor is connected.
  • the rectifier circuit according to the invention has only two rectifiers. This represents a reduction in the number of electrical components required, which leads to significant cost savings in particular in the case of a mass-produced product such as a hairdryer or a fan heater. However, the function of the circuit arrangement has not changed. Furthermore, by closing the switch mentioned, the total heating power and the total blower power is achieved.
  • connection point of the direct current blower motor is connected to the second heating resistor, which is provided with the serial switch.
  • the two rectifiers are connected to two tapping points of the first heating resistor.
  • the two tapping points on the first heating resistor can be chosen freely.
  • the voltage present at the direct current blower motor can thus be influenced by an appropriate choice of the tapping points.
  • the two rectifiers are connected to a tap point and to a base point of the first heating resistor.
  • the one tap point on the first heating resistor can be chosen freely.
  • the voltage present at the DC fan motor can thus be influenced.
  • connection point of the direct current blower motor connected to the second heating resistor is connected to a tap point of the second heating resistor which is arranged symmetrically to the two tap points or to the tap point and the base point of the two rectifiers on the first heating resistor. This ensures that the voltage applied to the direct current blower motor is approximately the same in both half-waves of the alternating current.
  • the two tapping points or the one tapping point are arranged symmetrically with respect to the base points of the first heating resistor. In this way it is achieved that the first heating resistor in both Half waves of the alternating current is loaded equally.
  • the two rectifiers are connected to the two opposite base points of the heating resistor. In this way it is achieved that the maximum available voltage is present at the DC fan motor.
  • connection point of the direct current blower motor connected to the heating resistor is connected to a tap point in the middle of the second heating resistor. In this way it is achieved that the second heating resistor is loaded equally in both half-waves of the alternating current.
  • Figure 1 shows a schematic circuit diagram of a first embodiment of a circuit arrangement according to the invention
  • Figure 2 shows a schematic circuit diagram of a second embodiment of a circuit arrangement according to the invention
  • Figure 3 shows a schematic circuit diagram of a third embodiment of a circuit arrangement according to the invention.
  • FIG. 1 shows an electrical circuit arrangement 1 in which a first heating resistor 2 is arranged between the poles 3, 4 of an AC voltage source. In parallel with the first heating resistor 2, a series circuit comprising a switch 5 and a second heating resistor 6 is connected between the poles 3, 4 of the AC voltage source.
  • the two heating resistors 2, 6 are of approximately the same design and in particular each generate approximately the same heating power.
  • a rectifier circuit 7 has two rectifiers 8, 9, in particular two diodes, which are connected to one another in anti-parallel. At the connection point 10 of the two rectifiers 8, 9 one of the connection points of a DC fan motor 1 1 is connected.
  • the still free connection points of the two rectifiers 8, 9 are connected to two tapping points 1 2, 13 of the first heating resistor 2, each of which has approximately the same distance from the associated base point 14, 1 5 of the first heating resistor 2. This distance is, for example, about 10 percent of the total length of the first heating resistor 2.
  • the still free connection point of the DC fan motor 11 is connected to a tap point 16 of the second heating resistor 6, which is located approximately in the middle of the second heating resistor 6.
  • the alternating current flows between the poles 3, 4 of the alternating voltage source in both directions via the first heating resistor 2.
  • the alternating current of the first half-wave also flows from the pole 3 via part of the first heating resistor 2, the tapping point 14 Rectifier 8, the connection point 10, the DC fan motor 1 1, the tap point 1 6 and half of the second heating resistor 6 to the pole 4 of the AC voltage source. Due to the open switch 5, however, no alternating current flows from the pole 4 via the direct current blower motor 11 to the pole 3 of the alternating voltage source during the opposite second half-wave.
  • the alternating current flows between the poles 3, 4 of the alternating voltage source in both directions via the first heating resistor 2 and via the second heating resistor 6.
  • the alternating current of the first half-wave flows from the pole 3 via part of the first heating resistor 2, the tap point 14, the rectifier 8, the connection point 10, the DC fan motor 1 1, the tap point 1 6 and half of the second heating resistor 6 to the pole 4 of the AC voltage source.
  • switch 5 When switch 5 is open, only one half-wave of the alternating current flows via the direct current blower motor 11, while when the switch 5 is closed, the alternating current flows from both half-waves via the direct current blower motor 11. The fan power is thus greater when switch 5 is closed than when switch 5 is open.
  • the voltage drop across the DC fan motor 1 1 can be set by the tapping points 1 2, 1 3. The greater the distance from the base points 14, 1 5 to the respective tapping points 1 2, 1 3, the smaller the voltage applied to the DC fan motor 1 1. This can be used in particular when using low-voltage blower motors to set the required operating voltage.
  • the voltage drop across the DC fan motor 1 1 is the same for both half-waves. Due to the symmetrical arrangement of the pickup points 1 2, 1 3 with respect to the heating resistor 2, this heating resistor 2 is loaded equally in both half-waves. Due to the symmetrical arrangement of the tap point 1 6 with respect to the heating resistor 6, this heating resistor 6 is loaded equally in both half-waves.
  • FIG. 2 shows an electrical circuit arrangement 17 which essentially corresponds to the circuit arrangement 1 in FIG. 1. For this reason, matching electrical components are identified by the same reference numerals.
  • the circuit arrangement 17 of FIG. 2 differs from the circuit arrangement 1 of FIG. 1 in another embodiment of the rectifier circuit 7.
  • the free connection point of the rectifier 8 is connected to a tap point 19 of the first heating resistor 2. which is arranged approximately in the middle of the heating resistor 2.
  • the free connection point of the rectifier 9 is connected to the base point 1 5 of the first heating resistor 2.
  • the free connection point of the DC fan motor 1 1 is with a tap point 20 of the second heating resistor 6, which is arranged at approximately 25 percent of the entire length of the second heating resistor 6.
  • the alternating current flows between the poles 3, 4 of the alternating voltage source in both directions via the first heating resistor 2.
  • the alternating current of the first half-wave also flows from the pole 3 via half of the first heating resistor 2, the tap point 1 9, the rectifier 8, the connection point 10, the DC fan motor 1 1, the tap point 20 and part of the second heating resistor 6 to the pole 4 of the AC voltage source. Due to the open switch 5, however, no alternating current flows from the pole 4 via the direct current blower motor 11 to the pole 3 of the alternating voltage source during the opposite second half-wave.
  • the alternating current flows between the poles 3, 4 of the alternating voltage source in both directions via the first heating resistor 2 and via the second heating resistor 6.
  • the alternating current of the first half-wave flows from the pole 3 via half of the first heating resistor 2, the tap point 19 , the rectifier 8, the connection point 10, the DC fan motor 1 1, the tap point 20 and part of the second heating resistor 6 to the pole 4 of the AC voltage source.
  • Due to the closed switch 5, the alternating current continues to flow from the pole 4 via the base point 15, the rectifier 9, the connection point 10, the direct current blower motor 11, the tap point 20 and part of the second heating resistor 6 to the pole 3 during the opposite second half-wave the AC voltage source.
  • FIG. 3 shows an electrical circuit arrangement 21 which essentially corresponds to the circuit arrangement 1 in FIG. 1. For this reason, matching electrical components are identified by the same reference numerals.
  • the circuit arrangement 21 in FIG. 2 differs from the circuit arrangement 1 in FIG. 1 in another embodiment of the rectifier circuit 7.
  • the free connection point of the rectifier 8 is connected to the base point 14 of the first heating resistor 2.
  • the free connection point of the rectifier 9 is connected to the base point 1 5 of the first heating resistor 2.
  • the free connection point of the DC fan motor 1 1 is connected to the tap point 16 of the second heating resistor 6, which is arranged at about half of the second heating resistor 6.
  • the alternating current flows between the poles 3, 4 of the alternating voltage source in both directions via the first heating resistor 2.
  • the alternating current of the first half-wave also flows from the pole 3 via the base point 14, the rectifier 8, the connection point 10, the direct current blower motor 1 1, the tap point 16 and half of the second heating resistor 6 to the pole 4 of the AC voltage source. Due to the open switch 5, however, no alternating current flows from the pole 4 via the direct current blower motor 11 to the pole 3 of the alternating voltage source during the opposite second half-wave.
  • the alternating current flows between the poles 3, 4 of the alternating voltage source in both directions via the first heating resistor 2 and via the second heating resistor 6.
  • the alternating current of the first half-wave flows from Pole 3 via the base point 14, the rectifier 8, the connection point 10, the DC fan motor 1 1, the tap point 16 and half of the second heating resistor 6 to the pole 4 of the AC voltage source. Due to the closed switch 5, the alternating current flows further during the opposite second half-wave from the pole 4 via the base point 15, the rectifier 9, the connection point 10, the DC fan motor 11, the tap point 16 and half of the second heating resistor 6 to the pole 3 AC voltage source.
  • switch 5 When switch 5 is open, only one half-wave of the alternating current flows via the direct current blower motor 11, while when the switch 5 is closed, the alternating current flows from both half-waves via the direct current blower motor 11. The fan power is thus greater when switch 5 is closed than when switch 5 is open.
  • the circuit arrangements 1, 17, 21 of Figures 1 to 3 can be used particularly advantageously in an electric hair dryer or in an electric fan heater.
  • the DC fan motor 1 1 is used in this case to generate an air flow and the two heating resistors 2, 6 are used to heat this air flow.
  • the switch 5 With the help of the switch 5, it is then possible to switch between a lower blower stage with a lower heat generation and a higher blower stage with a higher heat generation.
  • a second switch not shown, which can be arranged either in series with the first heating resistor 2 or in series with the parallel connection of the two heating resistors 2, 6, the circuit arrangements 1, 17, 21 of FIGS. 1 to 3 can be switched on and off.
  • a first and a second heating resistor (2,6) are provided.
  • these are interchangeable with resistors such that a total of at least one heating resistor remains in the circuit arrangement.
  • the respective heating resistor in FIGS. 1-3 can be replaced in whole or in part by a corresponding resistance component.
  • the resistance component is designed as a single resistor or as a plurality of resistors connected in series.
  • the electrical connection points to the direct current blower motor (1 1) or to the rectifier diodes (8,9) are to be defined between the series connected resistors, so that the electrical components do not have too much power for all operating modes is present. This is achieved, inter alia, by selecting the resistance values according to the positions of the electrical connection points (12, 13, 16, 19, 20) in FIGS. 1-3.
  • the second heating resistor (6) is preferably formed by two equal-sized series-connected resistors in FIG. 1 or 3 or by two series-connected resistors in FIG. 2 in a ratio of 1: 3 to 2/3 of the original heating resistor (6). replaced.

Landscapes

  • Cleaning And Drying Hair (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Relay Circuits (AREA)
  • Details Of Television Scanning (AREA)
  • Control Of Direct Current Motors (AREA)
  • Control Of Resistance Heating (AREA)
  • Rectifiers (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
EP97938886A 1996-08-08 1997-08-08 Circuit electrique pour assurer l'alimentation en courant Expired - Lifetime EP0920266B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19632029 1996-08-08
DE19632029A DE19632029A1 (de) 1996-08-08 1996-08-08 Elektrische Schaltung für die Stromversorgung
PCT/EP1997/004313 WO1998006296A1 (fr) 1996-08-08 1997-08-08 Circuit electrique pour assurer l'alimentation en courant

Publications (2)

Publication Number Publication Date
EP0920266A1 true EP0920266A1 (fr) 1999-06-09
EP0920266B1 EP0920266B1 (fr) 2001-01-24

Family

ID=7802136

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97938886A Expired - Lifetime EP0920266B1 (fr) 1996-08-08 1997-08-08 Circuit electrique pour assurer l'alimentation en courant

Country Status (11)

Country Link
US (1) US6031210A (fr)
EP (1) EP0920266B1 (fr)
JP (1) JP2000516494A (fr)
CN (1) CN1117537C (fr)
AT (1) ATE198819T1 (fr)
AU (1) AU720786B2 (fr)
DE (2) DE19632029A1 (fr)
DK (1) DK0920266T3 (fr)
ES (1) ES2155697T3 (fr)
RU (1) RU2198483C2 (fr)
WO (1) WO1998006296A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7153286B2 (en) 2002-05-24 2006-12-26 Baxter International Inc. Automated dialysis system
HK1048722A2 (en) * 2002-08-28 2003-03-28 Wing Kin Chan Hair dryer with improved heating power control and circuits therefor
US8027572B2 (en) 2008-02-22 2011-09-27 Baxter International Inc. Dialysis machine having multiple line voltage heater
US9435459B2 (en) * 2009-06-05 2016-09-06 Baxter International Inc. Solenoid pinch valve apparatus and method for medical fluid applications having reduced noise production
EP2371236A1 (fr) * 2010-03-31 2011-10-05 Tek Maker Corporation Circuits multi-réglages pour séchoir portable
CN113035032B (zh) * 2021-03-09 2022-09-30 山东电力高等专科学校 一种串半波整流型窃电模拟装置及模拟仿真方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3133325A1 (de) * 1981-02-05 1982-09-02 Braun Ag, 6000 Frankfurt Stromversorgungsschaltung fuer einen elektrischen verbraucher mit zwei parallelen heizwiderstaenden und einem geblaesemotor
DE3302609A1 (de) * 1983-01-27 1984-08-02 Braun Ag, 6000 Frankfurt Schaltunganordnung zur stromversorgung
GB2293098B (en) * 1994-09-15 1998-10-07 Kenford Ind Co Ltd Hair treatment device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9806296A1 *

Also Published As

Publication number Publication date
AU720786B2 (en) 2000-06-15
ATE198819T1 (de) 2001-02-15
US6031210A (en) 2000-02-29
DE19632029A1 (de) 1998-02-12
JP2000516494A (ja) 2000-12-12
ES2155697T3 (es) 2001-05-16
DK0920266T3 (da) 2001-06-05
RU2198483C2 (ru) 2003-02-10
AU4117897A (en) 1998-03-06
WO1998006296A1 (fr) 1998-02-19
CN1227475A (zh) 1999-09-01
CN1117537C (zh) 2003-08-13
EP0920266B1 (fr) 2001-01-24
DE59702955D1 (de) 2001-03-01

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