WO1988000405A1 - Electrical cut-out system - Google Patents

Electrical cut-out system Download PDF

Info

Publication number
WO1988000405A1
WO1988000405A1 PCT/DE1987/000286 DE8700286W WO8800405A1 WO 1988000405 A1 WO1988000405 A1 WO 1988000405A1 DE 8700286 W DE8700286 W DE 8700286W WO 8800405 A1 WO8800405 A1 WO 8800405A1
Authority
WO
WIPO (PCT)
Prior art keywords
relay
voltage
excitation coil
switch
cut
Prior art date
Application number
PCT/DE1987/000286
Other languages
German (de)
English (en)
French (fr)
Inventor
Friedrich Lauerer
Original Assignee
Friedrich Lauerer
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 Friedrich Lauerer filed Critical Friedrich Lauerer
Publication of WO1988000405A1 publication Critical patent/WO1988000405A1/de

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays
    • H02H5/083—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal fluid pressure, liquid level or liquid displacement, e.g. Buchholz relays responsive to the entry or leakage of a liquid into an electrical appliance

Definitions

  • the invention relates to a switch-off device for alternating current / which is used in particular to avert danger and works with at least one sensor.
  • the hair dryer is used / where protection against electrocution is provided in the event / that the hair dryer falls into the bathtub filled with water.
  • the invention has for its object to provide protection against electrocution in the bathtub / while avoiding the disadvantages mentioned and with the least effort.
  • the functional analysis of the proposed circuit shows / that the protection is also provided / if the neutral conductor is interrupted (for example by wire interruption / fuse or switch) / if the network loop impedance has a high value if the bathtub is insulated or if a two-phase operation is given.
  • Exemplary embodiments of the invention are shown in the drawings.
  • the consumer device (2/3/4) for example a hair dryer / is connected to the mains socket S / which is fed by the mains transformer T.
  • the excitation coil 1 of the bistable and polarized relay with two cut-off contacts 5 and 6 is connected in the middle of the heating coil 3 and to the sensor 7.
  • In all areas of the hair dryer / where liquid can penetrate / sensors are arranged so that the liquid first touches a sensor / before it reaches a live point.
  • the excitation coil receives 1 voltage (regardless of the plug position). And the next mains half-wave of suitable polarity takes place, ie after 15 ms at the latest, double-pole shutdown by contacts 5 and 6. Since a polarized bistable relay is used, the hairdryer remains switched off; even if it is taken out of the water and falls into the water again.
  • a Grharmonic rectifier 8 is located in the excitation circuit, as a result of which the excitation coil 1 is supplied with current of the same polarity on each half-wave. This ensures that the switch-off takes place at the first or during the next half-wave, i.e. it takes place after max. 10 ms.
  • the consumer resistors 2, 3, 4, but additional resistors 9 and 10 are not used as voltage dividers. In this way, a considerably higher functional reliability is achieved / since heating windings can experience an interruption rather than weakly loaded resistors.
  • the electrical device can only be switched on again by applying direct voltage of specific polarity to the excitation winding or to an additional excitation winding.
  • Fig. 4 an additional circuit is specified / which causes the device to be automatically switched on again.
  • the capacitor 17 With the aid of the supply voltage that is not switched off (see FIGS. 12 and 13), the capacitor 17 is charged with two polarities via two high-impedance resistors 14 and 15 and the rectifier 16 / which enables a restart. If the capacitor voltage exceeds the threshold value of the voltage-dependent switch 18, this switch switches through and the excitation coil 1 receives a current surge which switches the relay on again. 19 is a necessary protective resistor.
  • the desired reclosing time can be determined by suitable R-C dimensioning (14, 15 and 17). In the event that the dangerous state is still present at the time of the automatic restart, the system is immediately switched off again.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Protection Of Static Devices (AREA)
  • Emergency Protection Circuit Devices (AREA)
PCT/DE1987/000286 1986-06-27 1987-06-24 Electrical cut-out system WO1988000405A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3621528.7 1986-06-27
DE19863621528 DE3621528A1 (de) 1986-06-27 1986-06-27 Elektrische abschalteinrichtung

Publications (1)

Publication Number Publication Date
WO1988000405A1 true WO1988000405A1 (en) 1988-01-14

Family

ID=6303811

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1987/000286 WO1988000405A1 (en) 1986-06-27 1987-06-24 Electrical cut-out system

Country Status (4)

Country Link
EP (1) EP0271544A1 (enrdf_load_stackoverflow)
AU (1) AU7547487A (enrdf_load_stackoverflow)
DE (1) DE3621528A1 (enrdf_load_stackoverflow)
WO (1) WO1988000405A1 (enrdf_load_stackoverflow)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3811994A1 (de) * 1988-04-11 1989-10-19 Lauerer Friedrich Elektrische sensorschaltung
DE3835346A1 (de) * 1988-10-17 1990-04-19 Friedrich Lauerer Elektrisches heizgeraet
DE3913925A1 (de) * 1989-04-27 1990-10-31 Lauerer Friedrich Sensorschaltung
JPH03183317A (ja) * 1989-09-05 1991-08-09 Uchiya Thermostat Kk 浸水感知電源遮断回路
DE4008970A1 (de) * 1990-03-21 1991-09-26 Vorwerk Co Interholding Schutzeinrichtung fuer elektrisch betriebene, schutzisolierte geraete
DE4111599C1 (enrdf_load_stackoverflow) * 1991-04-10 1992-08-06 Friedrich Dipl.-Phys. 8033 Krailling De Lauerer
DE4405634C1 (de) * 1993-11-08 1995-02-09 Lauerer Friedrich Schutzschaltung für Elektrogeräte
DE4418292A1 (de) * 1994-05-26 1995-11-30 Telefunken Microelectron Induktiver Bewegungssensor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0001831A2 (en) * 1977-11-03 1979-05-16 Ravida, Antonino Apparatus protected against electric current short circuits
EP0049870A1 (de) * 1980-10-09 1982-04-21 Friedrich Lauerer Fehlerstromschutzeinrichtung
FR2504366A1 (fr) * 1981-04-24 1982-10-29 Licentia Gmbh Seche-cheveux electrique comportant une soufflerie et un element de chauffage
US4464582A (en) * 1982-10-12 1984-08-07 Tsunehide Aragaki Water-safe hair dryer circuit
DE3514135A1 (de) * 1985-04-19 1986-10-23 Braun Ag, 6000 Frankfurt Leitungstrennvorrichtung fuer netzbetriebene geraete

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH596833A5 (enrdf_load_stackoverflow) * 1975-09-25 1978-03-31 Creativ Patentanstalt
DE3116285A1 (de) * 1981-04-24 1983-02-03 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Elektrischer hand-haartrockner mit geblaese und heizung
DE3781572T2 (de) * 1986-02-28 1993-04-08 Philips Corp Schutzschaltung vor elektrischem schock mit mechanischer verriegelung fuer ein kleines geraet.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0001831A2 (en) * 1977-11-03 1979-05-16 Ravida, Antonino Apparatus protected against electric current short circuits
EP0049870A1 (de) * 1980-10-09 1982-04-21 Friedrich Lauerer Fehlerstromschutzeinrichtung
FR2504366A1 (fr) * 1981-04-24 1982-10-29 Licentia Gmbh Seche-cheveux electrique comportant une soufflerie et un element de chauffage
US4464582A (en) * 1982-10-12 1984-08-07 Tsunehide Aragaki Water-safe hair dryer circuit
DE3514135A1 (de) * 1985-04-19 1986-10-23 Braun Ag, 6000 Frankfurt Leitungstrennvorrichtung fuer netzbetriebene geraete

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Electronic Design, Band 28, Nr. 6, 15. Marz 1980, (Rochelle Park, USA), J. CLIFTON: "Paper Towel Sensor protects PC Boards from Conductive Fluid spills", seite 300, siehe figur 2, rechte spalte, zeilen 3-13 *

Also Published As

Publication number Publication date
EP0271544A1 (de) 1988-06-22
DE3621528A1 (de) 1988-01-14
DE3621528C2 (enrdf_load_stackoverflow) 1991-01-17
AU7547487A (en) 1988-01-29

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