EP0433592A1 - Minuterie commandée par ordinateur - Google Patents

Minuterie commandée par ordinateur Download PDF

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Publication number
EP0433592A1
EP0433592A1 EP90119536A EP90119536A EP0433592A1 EP 0433592 A1 EP0433592 A1 EP 0433592A1 EP 90119536 A EP90119536 A EP 90119536A EP 90119536 A EP90119536 A EP 90119536A EP 0433592 A1 EP0433592 A1 EP 0433592A1
Authority
EP
European Patent Office
Prior art keywords
switch
microcomputer
network
pulse
time
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.)
Ceased
Application number
EP90119536A
Other languages
German (de)
English (en)
Inventor
Jürgen Dipl.-Ing. Marx (FH)
Frank Ing. Grad. Reissner
Artur Weich
Gerhard Dietz
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to FI905988A priority Critical patent/FI905988A/fi
Priority to NO90905577A priority patent/NO905577L/no
Publication of EP0433592A1 publication Critical patent/EP0433592A1/fr
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/226—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil for bistable relays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
    • H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
    • H01H47/24—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil having light-sensitive input

Definitions

  • the invention relates to a computer-controlled electrical timer according to the preamble of patent claim 1.
  • a control circuit for a bipolar AC relay with mechanical switch contact in which a polarized relay is used as a bistable relay, which is held in its two end positions by permanent magnetic forces.
  • the only switching coil of the relay is in a thyristor controlled AC circuit.
  • the switching coil receives a switching pulse of appropriate polarity via the thyristor for the duration of the positive or negative half-wave of the AC voltage.
  • a logic circuit is intended to ensure that only the half-wave required for switching arrives at the switching coil in order to form a switching pulse and the other half-waves are suppressed. The switching itself takes place in the area of the zero crossing of the AC voltage of the half-wave in question.
  • This known circuit arrangement fulfills its purpose when using polarized relays, in which no high switching forces are required. With such a relay, therefore, no high powers can be switched. If the switch contact of such a relay is spot welded, for example by a high inrush current, the force available to open its contact is no longer sufficient to open it. When using such a relay, it is therefore necessary to switch the relevant consumer on and off using an additional contactor.
  • the invention has for its object to design a small and compact electronic timer so that with the help of a relatively small, housed in the housing of the timer bistable relay consumers with a relatively high power can be switched safely.
  • the time switch described above is used to switch lighting bodies, for example for shop windows, on and off.
  • the microcomputer does this accordingly programmed the desired switch-on and switch-off times.
  • switch-on and switch-off times have the disadvantageous consequence that the lighting is switched on or off either too early or too late, depending on the outside brightness.
  • Such a rigid switching behavior leads to an unnecessarily high energy consumption.
  • this can be avoided by additionally supplying the microcomputer with brightness information in addition to a time component.
  • the timing of the switch-on and switch-off pulses can be corrected by a logical combination of time and brightness values in such a way that the switch-on time is reduced in the specified time frame to those time periods at which the ambient brightness falls below a certain level.
  • the electronic time switch is made up of an AC network O, P fed.
  • the excitation coils 4, 5 of the bistable relay 3 are connected in series and connected to the mains voltage terminals O, P via a TRIAC 7.
  • the excitation coil 4 is a rectifier 8 and the excitation coil 5 is a rectifier 9 connected in parallel with opposite pass directions.
  • a known capacitor power supply unit which consists of a series connection of an ohmic limiting resistor 10, a capacitor 11 and a one-way rectifier 12 in the mains pole P and one between the latter two components and the mains pole O connected Zener diode 13 and finally one between the DC voltage connection of the Rectifier 12 and the network pole O arranged smoothing capacitor 14 is formed.
  • the DC supply voltage for the microcomputer 2 and the other electronic components is produced across the smoothing capacitor 14. This voltage is fed via an electronic voltage regulator 15 to the microcomputer 2 as a positive pole of the DC supply voltage, the negative pole of which is the phase conductor P of the supply network.
  • the microcomputer 2 In order to supply the microcomputer 2 with information about the instantaneous values of the mains voltage O, P and their phase position, the latter is connected to the mains pole P via the resistor 16.
  • the TRIAC 7 is controlled on the basis of switch-on and switch-off pulses which are generated by the microcomputer 2 and reach the control electrode of the TRIAC 7 via the operational amplifier 17.
  • the microcomputer 2 has a display 18 for displaying the current time, which can be set using the time button 19. With the help of the switching time button 20, the switch-on and switch-off times can be selected.
  • the microcomputer has terminals H, I for a brightness sensor 21.
  • a resistor with a positive temperature coefficient (PTC resistor) 22 is arranged in the circuit of the excitation coils 4, 5 of the bistable relay 3.
  • the current time on the display 18 can first be set on the microcomputer 2 using the time button 19. Then the desired switch-on and switch-off times, based on the relevant weekday, can be preselected with the aid of the switching time button 20.
  • the microcomputer 2 When the switch-on time is reached, the microcomputer 2 generates a pulse which arrives at the switching electrode of the TRIAC 7 via the operational amplifier 17, so that it closes the excitation circuit of the switch-on excitation coil 4 during a single half-wave or successively several half-waves of one polarity direction.
  • a current flows from the line phase P via the PTC resistor 22, the rectifier 9, the excitation coil 4 and the TRIAC 7 to the neutral conductor O of the feed network.
  • the switch-on excitation coil 4 closes the contact 6. This is done by known means mechanically or magnetically held in the closed position until the microcomputer delivers a switch-off pulse at the set switch-off time, which is effective at the beginning of the following antipolar network phase for the duration of one or more phases of the same polarity.
  • a current flows in the opposite direction from the neutral conductor O via the TRIAC 7, the rectifier 8, the switch-off excitation coil 5 and the PTC resistor 22 to the mains phase P of the feed network.
  • the switch-off excitation coil 5 is firmly connected to the switch 6 via known mechanical means and forcibly opens it.
  • the PTC resistor is dimensioned and the coils are dimensioned such that the excitation current which is set is only permissible for a short time and therefore leads to a high magnetic force which opens the switch 6 even if it is spot welded due to a high inrush current .
  • the PTC resistor 22 comes into operation. It then limits the excitation current to a value that does not lead to inadmissible heating of the excitation coils.
  • the brightness sensor 21 connected to the microcomputer 2 generates a control variable dependent on the measured brightness value of the environment. This makes it possible to control the switch 6 both time-dependent and brightness-dependent.
  • the microcomputer 2 links the time value with the brightness value logically in such a way that the switch-on pulse after the programmed switch-on time and before the programmed switch-off time is only given to the TRIAC 7 if a certain brightness value does not yet exist in the morning steps and has not fallen below in the afternoon. This avoids that the switch-on and switch-off times have to be corrected manually according to the season and the weather in order to use the required lighting energy as sparingly as possible.
  • FIG. 2 A circuit arrangement for obtaining a brightness-dependent digital measured value as the basis for generating a brightness-dependent control variable by the microcomputer 2 is shown in FIG. 2.
  • the brightness sensor 21 is connected to a monostable multivibrator 25 via matching resistors 23, 24.
  • This consists in a known manner of the two solid-state switches 26, 27, which are connected to one another via a capacitor 28 and a feedback resistor 29 such that they occur when a trigger pulse occurs at the output T of the microcomputer 2, which is sent via the matching resistor 30 to the base of the Switching transistor 26 arrives, this changes from the conductive state to the non-conductive state and at the same time switches the switching transistor 27 from the non-conductive state to the conductive state.
  • the length of time during which the switching transistor 27 remains in the conductive state depends on the state of charge of the capacitor 28, which in turn is determined by the current magnitude of the brightness sensor 21.
  • the sensor 21 controls the on-time of the switching transistor 27 as a function of the brightness striking it.
  • Its emitter is connected via the diode 3l and the matching resistor 32 to the charging capacitor 33, which is connected between ground and the input P of the microcomputer 2 .
  • This charges itself gradually via the switching transistor 27 during the switch-on period from switch-on to switch-on and, after a certain number of switch-on pulses dependent on the control current of the brightness sensor 21 and thus on the brightness, reaches a defined upper (high) voltage level, which the microcomputer 2 transmits into a Measuring pulse is implemented.
  • the output E of the microcomputer switches to ground, so that the charging capacitor 33 via the discharge resistor 34 to the lower (low) voltage level is discharged, after reaching the output E of the microcomputer again separated from the ground potential and thus the charging capacitor 33 is released for recharging.
  • a brightness-dependent pulse sequence is thus created at the input P of the microcomputer as a digital measurement variable for the brightness value measured in each case.
  • the supply voltage for the brightness sensor 21 and the multivibrator 25 there is the supply voltage for the brightness sensor 21 and the multivibrator 25.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Relay Circuits (AREA)
EP90119536A 1989-12-22 1990-10-11 Minuterie commandée par ordinateur Ceased EP0433592A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FI905988A FI905988A (fi) 1989-12-22 1990-12-04 Databaserat elektriskt kopplingsur.
NO90905577A NO905577L (no) 1989-12-22 1990-12-21 Datamaskinstyrt koblingsur.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP89123783 1989-12-22
EP89123783 1989-12-22

Publications (1)

Publication Number Publication Date
EP0433592A1 true EP0433592A1 (fr) 1991-06-26

Family

ID=8202265

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90119536A Ceased EP0433592A1 (fr) 1989-12-22 1990-10-11 Minuterie commandée par ordinateur

Country Status (1)

Country Link
EP (1) EP0433592A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4219834A1 (de) * 1992-06-17 1993-12-23 Fraunhofer Ges Forschung Verfahren und Vorrichtung zur Ansteuerung eines elektromagnetischen Schalters
WO1997017712A1 (fr) * 1995-11-04 1997-05-15 University Of Southampton Interrupteur hybride
US5699221A (en) * 1993-02-24 1997-12-16 Paralight Limited Support bracket for an electrical unit
WO2002082485A1 (fr) * 2001-04-06 2002-10-17 John Russell Fielden Commutateur et circuit de commutation
GB2389461A (en) * 2002-06-06 2003-12-10 Arc Technology Co Ltd Control circuit for a solenoid actuated relay

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2806628B1 (de) * 1978-02-16 1979-05-23 Diehl Gmbh & Co Ansteuerschaltung fuer ein Wechselstromrelais
FR2488036A3 (fr) * 1980-07-31 1982-02-05 Landis & Gyr Ag Montage et dispositif d'actionnement d'un electro-aimant
US4318094A (en) * 1976-06-30 1982-03-02 General Electric Company Interface device for remote control
EP0081605A1 (fr) * 1981-12-14 1983-06-22 LEGRAND GmbH Dispositif magnétique bistable

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4318094A (en) * 1976-06-30 1982-03-02 General Electric Company Interface device for remote control
DE2806628B1 (de) * 1978-02-16 1979-05-23 Diehl Gmbh & Co Ansteuerschaltung fuer ein Wechselstromrelais
FR2488036A3 (fr) * 1980-07-31 1982-02-05 Landis & Gyr Ag Montage et dispositif d'actionnement d'un electro-aimant
EP0081605A1 (fr) * 1981-12-14 1983-06-22 LEGRAND GmbH Dispositif magnétique bistable

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4219834A1 (de) * 1992-06-17 1993-12-23 Fraunhofer Ges Forschung Verfahren und Vorrichtung zur Ansteuerung eines elektromagnetischen Schalters
US5699221A (en) * 1993-02-24 1997-12-16 Paralight Limited Support bracket for an electrical unit
WO1997017712A1 (fr) * 1995-11-04 1997-05-15 University Of Southampton Interrupteur hybride
WO2002082485A1 (fr) * 2001-04-06 2002-10-17 John Russell Fielden Commutateur et circuit de commutation
GB2389461A (en) * 2002-06-06 2003-12-10 Arc Technology Co Ltd Control circuit for a solenoid actuated relay

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