EP0271544A1 - Electrical cut-out system - Google Patents
Electrical cut-out systemInfo
- Publication number
- EP0271544A1 EP0271544A1 EP19870904026 EP87904026A EP0271544A1 EP 0271544 A1 EP0271544 A1 EP 0271544A1 EP 19870904026 EP19870904026 EP 19870904026 EP 87904026 A EP87904026 A EP 87904026A EP 0271544 A1 EP0271544 A1 EP 0271544A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- relay
- cut
- switch
- voltage
- current
- 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- Withdrawn
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)
- Emergency Protection Circuit Devices (AREA)
- Protection Of Static Devices (AREA)
Abstract
Le système décrit fonctionne d'une manière très simple avec du courant alternatif et est particulièrement indiqué pour assurer une protection contre le danger. Un relais bistable sert de dispositif de coupure, ledit relais prélevant le courant nécessaire à la coupure sur un diviseur de tension (2, 3, 4). La tension appliquée à la bobine d'excitation (1), par exemple en cas de danger, et qui entraîne la commutation du relais, est égale à la moitié de la tension d'alimentation. Si le courant doit être coupé, la bobine d'excitation (1) reçoit la tension requise de l'un ou l'autre pôle de la source de courant, c'est-à-dire que la coupure est effectuée indépendamment du trajet du courant ou de la position de la prise. La coupure (5, 6) peut être déclenchée par une sonde (7) sensible à l'humidité, aux liquides, à la température ou à d'autres états physiques ou chimiques. Le nombre de composants requis étant très faible (seul un relais est nécessaire) la fiabilité opérationnelle est élevée et ne dépend que de la fiabilité du relais. Le circuit de commutation lui-même fonctionne notamment même en cas d'interruption de la ligne neutre, en cas de résistance de boucle élevée et en cas de fonctionnement en courant alternatif biphasé. Ce système de coupure peut être utilisé par exemple dans un séchoir à cheveux et empêche l'électrocution si l'appareil tombe dans une baignoire remplie d'eau.The system described works in a very simple way with alternating current and is particularly indicated to ensure protection against danger. A bistable relay serves as a cut-off device, said relay taking the current necessary for cut-off from a voltage divider (2, 3, 4). The voltage applied to the excitation coil (1), for example in the event of danger, and which causes the relay to switch, is equal to half of the supply voltage. If the current has to be cut, the excitation coil (1) receives the required voltage from either pole of the current source, i.e. the cut is made independently of the path of the current or position of the socket. The cut-off (5, 6) can be triggered by a probe (7) sensitive to humidity, liquids, temperature or other physical or chemical states. The number of components required being very low (only one relay is necessary) the operational reliability is high and depends only on the reliability of the relay. The switching circuit itself functions in particular even in the event of an interruption of the neutral line, in the event of high loop resistance and in the case of two-phase alternating current operation. This cut-off system can be used, for example, in a hair dryer and prevents electrocution if the appliance falls into a bathtub filled with water.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3621528 | 1986-06-27 | ||
DE19863621528 DE3621528A1 (en) | 1986-06-27 | 1986-06-27 | ELECTRICAL SHUT-OFF DEVICE |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0271544A1 true EP0271544A1 (en) | 1988-06-22 |
Family
ID=6303811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870904026 Withdrawn EP0271544A1 (en) | 1986-06-27 | 1987-06-24 | Electrical cut-out system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0271544A1 (en) |
AU (1) | AU7547487A (en) |
DE (1) | DE3621528A1 (en) |
WO (1) | WO1988000405A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3811994A1 (en) * | 1988-04-11 | 1989-10-19 | Lauerer Friedrich | Electrical sensor circuit |
DE3835346A1 (en) * | 1988-10-17 | 1990-04-19 | Friedrich Lauerer | ELECTRIC HEATING UNIT |
DE3913925A1 (en) * | 1989-04-27 | 1990-10-31 | Lauerer Friedrich | Sensor circuit for hair=dryer safety - uses automatic cut=out relay coupled to centre tap of resistive voltage divider |
JPH03183317A (en) * | 1989-09-05 | 1991-08-09 | Uchiya Thermostat Kk | Flood sensing and power supply interrupting circuit |
DE4008970A1 (en) * | 1990-03-21 | 1991-09-26 | Vorwerk Co Interholding | Protection unit for electric insulated appliance without earth - has fault or differential current switch with protection conductor monitor tripping upon under voltage |
DE4111599C1 (en) * | 1991-04-10 | 1992-08-06 | Friedrich Dipl.-Phys. 8033 Krailling De Lauerer | |
DE4405634C1 (en) * | 1993-11-08 | 1995-02-09 | Lauerer Friedrich | Protection circuit for electrical equipment |
DE4418292A1 (en) * | 1994-05-26 | 1995-11-30 | Telefunken Microelectron | Inductive movement sensor for irons |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH596833A5 (en) * | 1975-09-25 | 1978-03-31 | Creativ Patentanstalt | |
IT1087195B (en) * | 1977-11-03 | 1985-05-31 | Gilardoni Giovanni | PROTECTION SYSTEM AGAINST SHORT-CIRCUITS AND LIGHTNING BY ELECTRIC CURRENT, AND EQUIPMENT AND POWER CORD THAT USE THIS SYSTEM |
DE3038101C2 (en) * | 1980-10-09 | 1984-03-22 | Friedrich Dipl.-Ing. 8033 Krailling Lauerer | Residual current device |
DE3116285A1 (en) * | 1981-04-24 | 1983-02-03 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Electric hand-held hair dryer with fan and heater |
FR2504366A1 (en) * | 1981-04-24 | 1982-10-29 | Licentia Gmbh | Safe electric hair drier for use in wet conditions - has earthed screens at air inlet and outlet for operating protective devices when hair dryer is in contact with water |
US4464582A (en) * | 1982-10-12 | 1984-08-07 | Tsunehide Aragaki | Water-safe hair dryer circuit |
DE3514135A1 (en) * | 1985-04-19 | 1986-10-23 | Braun Ag, 6000 Frankfurt | Line interrupter device for mains-powered apparatuses |
DE3781572T2 (en) * | 1986-02-28 | 1993-04-08 | Philips Corp | PROTECTIVE CIRCUIT AGAINST ELECTRIC SHOCK WITH MECHANICAL LOCK FOR A SMALL DEVICE. |
-
1986
- 1986-06-27 DE DE19863621528 patent/DE3621528A1/en active Granted
-
1987
- 1987-06-24 WO PCT/DE1987/000286 patent/WO1988000405A1/en not_active Application Discontinuation
- 1987-06-24 AU AU75474/87A patent/AU7547487A/en not_active Abandoned
- 1987-06-24 EP EP19870904026 patent/EP0271544A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO8800405A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE3621528A1 (en) | 1988-01-14 |
DE3621528C2 (en) | 1991-01-17 |
AU7547487A (en) | 1988-01-29 |
WO1988000405A1 (en) | 1988-01-14 |
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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 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19880711 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AT BE CH FR GB IT LI NL SE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: 8566 |
|
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: 19900331 |