EP0271826B1 - Elektronische Herdschaltuhr - Google Patents

Elektronische Herdschaltuhr Download PDF

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Publication number
EP0271826B1
EP0271826B1 EP87118304A EP87118304A EP0271826B1 EP 0271826 B1 EP0271826 B1 EP 0271826B1 EP 87118304 A EP87118304 A EP 87118304A EP 87118304 A EP87118304 A EP 87118304A EP 0271826 B1 EP0271826 B1 EP 0271826B1
Authority
EP
European Patent Office
Prior art keywords
switch
control circuit
mains voltage
selector switch
pole
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.)
Expired - Lifetime
Application number
EP87118304A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0271826A3 (en
EP0271826A2 (de
Inventor
Alfred Meisner
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.)
Diehl Verwaltungs Stiftung
Original Assignee
Diehl GmbH and Co
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 Diehl GmbH and Co filed Critical Diehl GmbH and Co
Publication of EP0271826A2 publication Critical patent/EP0271826A2/de
Publication of EP0271826A3 publication Critical patent/EP0271826A3/de
Application granted granted Critical
Publication of EP0271826B1 publication Critical patent/EP0271826B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G15/00—Time-pieces comprising means to be operated at preselected times or after preselected time intervals
    • G04G15/006—Time-pieces comprising means to be operated at preselected times or after preselected time intervals for operating at a number of different times

Definitions

  • the invention relates to an electronic stove timer with a control circuit, a display panel, with input elements and with a changeover switch in the control circuit, by means of which the consumer controlled by the time switch via a circuit breaker can be switched from manual operation to automatic operation with digital input of at least one complete switching date.
  • An electronic timer of this type is already known from DE-OS 33 20 128.
  • the input elements for the digital display in the watch are used to switch from manual operation - this is the normal operation of the watch - to automatic operation.
  • the selector switch for the consumer for example the knob for the hotplate control, must be set to zero and the clock itself must be reset from automatic to manual mode. If the selector switch is inadvertently not reset, the consumer receives power again when the clock is reset from automatic to manual mode without the user requesting this.
  • the invention proposes the characterizing features of claim 1.
  • the invention is based on the fact that it is established whether, on the one hand, the circuit breaker for the consumer is open again after the switching date has expired and whether the selector switch has been reset to zero. As soon as the latter is the case, the control circuit of the time switch is given a signal which resets the time switch from automatic to manual mode. If, on the other hand, the selector switch is not reset to zero, the clock remains in automatic mode and the consumer cannot be energized again unintentionally, in this case energization is only possible when a new cooking time is entered.
  • This arrangement results in the elimination of a mechanical switch for manual and automatic operation and offers and another advantage that the consumer does not receive any current if operated incorrectly.
  • FIG. 1 the front view of a stove timer 1 is shown, in which one recognizes a digital display 2 for the display of minutes and hours. Furthermore, a rotary knob 3 for setting the digital display and function keys 4 are provided, by means of which it can be selected whether a cooking time or a cooking time end or a short time should be entered.
  • FIG 2 an electronic circuit arrangement is shown, which is used to implement the invention and is installed in the time switch except for the selector switch and the consumer.
  • a power supply unit 7 an arrangement for level adjustment 8, a control circuit 9, a circuit breaker 11 actuated by a relay 10, a selector switch 12 and a consumer 13 as well as a high-resistance resistor 14 are provided on two poles 5 and 6 of the mains voltage supply.
  • the power supply 7 is constructed in a conventional manner and contains a capacitor 15 for reducing the mains voltage, a Zener diode 16 for stabilization and a diode 17 and a capacitor 18 for rectifying the voltage for the control circuit 9, which is preferably a microprocessor and the entire process of Clock controls.
  • the circuit arrangement 8 for level adjustment comprises two resistors 19 and 20 and a diode 21 and only serves to create a suitable input level for the control circuit 9, starting from the node 22.
  • the signal line between this circuit arrangement 8 and the control circuit 9 is designated 23.
  • the control circuit 9 switches a relay 10 on or off which actuates the circuit breaker 11 in the control circuit for the consumer.
  • This consumer 13 is, for example, a hotplate or the oven of an electric cooker.
  • the power supply for the consumer can be set in several stages by the selector switch 12.
  • the high-resistance resistor 14 between the switching point 22 and the pole 5 of the mains voltage serves to bridge the circuit breaker 11 and is important in the sense of the invention for the detection of its switching position, namely whether open or closed. If selector switch 12 and circuit breaker 11 are closed, the potential at node 22 is also high, assuming that there is a high potential at pole 5.
  • the circuit arrangement described has the following mode of operation.
  • the time switch is in manual mode, that is, by setting the selector switch, the consumer 13 can be actuated directly and operated with the set switching level.
  • the circuit breaker 11 is closed. If a switching date, for example a cooking time of 3 hours and a cooking time end is entered via the function keys 4 and the rotary knob 3, the time of which is more than 3 hours later than the current time, the circuit breaker 11 is opened by the control circuit 9.
  • the user is already setting the intended heat setting via the selector switch.
  • the cooking process cannot begin.
  • the selector switch 12 remains closed.
  • the potential at node 22 is reduced to its low value again.
  • the control circuit 9 does not yet receive any signal and the clock remains in automatic mode. The consumer cannot be energized again unless the cooking result requires an extension of the cooking time; in this case a new cooking time would have to be entered - without pressing the selector again.
  • the transition of the potential at node 22 from low to zero potential is thus evaluated as a criterion for the fact that the line switch 11 is open and the selector switch 12 is opened. This state is indicative of the fact that a switching date has been processed and the time switch has to be switched back to manual mode.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Predetermined Time Intervals (AREA)
  • Keying Circuit Devices (AREA)
  • Baking, Grill, Roasting (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)
  • Cookers (AREA)
  • Electric Clocks (AREA)
EP87118304A 1986-12-18 1987-12-10 Elektronische Herdschaltuhr Expired - Lifetime EP0271826B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863643260 DE3643260A1 (de) 1986-12-18 1986-12-18 Elektronische herdschaltuhr
DE3643260 1986-12-18

Publications (3)

Publication Number Publication Date
EP0271826A2 EP0271826A2 (de) 1988-06-22
EP0271826A3 EP0271826A3 (en) 1990-03-28
EP0271826B1 true EP0271826B1 (de) 1993-03-17

Family

ID=6316481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87118304A Expired - Lifetime EP0271826B1 (de) 1986-12-18 1987-12-10 Elektronische Herdschaltuhr

Country Status (3)

Country Link
US (1) US4769556A (enrdf_load_stackoverflow)
EP (1) EP0271826B1 (enrdf_load_stackoverflow)
DE (2) DE3643260A1 (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994022065A1 (en) * 1993-03-19 1994-09-29 Erkki Telamo Method and apparatus for interrupting current supply to an electric load
CA2239002C (en) * 1997-06-12 2002-05-28 Jack J. Carter Precautionary timer for kitchen range surface elements
WO2000054117A1 (en) * 1999-03-05 2000-09-14 Ardem Pişirici Ve Isitici Cihazlar Sanayii A.Ş. Separate digital timer used in household appliances
US6863454B2 (en) 2002-02-25 2005-03-08 Ginfax Development Limited Photographic film cartridge and camera including such
US6773173B2 (en) * 2001-11-02 2004-08-10 Ginfax Development Ltd. Photographic film cartridge and camera including such
US6999293B2 (en) * 2002-02-20 2006-02-14 Erkki Telamo Safety device for a delta-connected three-phase electric appliance

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3044235A1 (de) * 1980-11-25 1982-06-03 Giovanni Ing.(grad.) 7000 Stuttgart Quinzio Zusatzschaltgeraet
DE3320128A1 (de) * 1983-06-03 1984-12-06 Diehl GmbH & Co, 8500 Nürnberg Elektronische schaltuhr

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266118A (en) * 1977-04-25 1981-05-05 Mitsubishi Denki Kabushiki Kaisha Cooking control circuit for cooking range
US4367387A (en) * 1979-05-15 1983-01-04 Sanyo Electric Co., Ltd. Electronic controlled heat cooking apparatus
EP0057993B1 (en) * 1981-01-22 1985-05-08 Kabushiki Kaisha Toshiba Coffee maker
JPH0655179B2 (ja) * 1984-10-05 1994-07-27 株式会社東芝 炊飯器
JPS61114488A (ja) * 1984-11-09 1986-06-02 株式会社東芝 誘導加熱調理器

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3044235A1 (de) * 1980-11-25 1982-06-03 Giovanni Ing.(grad.) 7000 Stuttgart Quinzio Zusatzschaltgeraet
DE3320128A1 (de) * 1983-06-03 1984-12-06 Diehl GmbH & Co, 8500 Nürnberg Elektronische schaltuhr

Also Published As

Publication number Publication date
EP0271826A3 (en) 1990-03-28
DE3784871D1 (de) 1993-04-22
DE3643260C2 (enrdf_load_stackoverflow) 1991-04-25
DE3643260A1 (de) 1988-07-07
US4769556A (en) 1988-09-06
EP0271826A2 (de) 1988-06-22

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