GB2171278A - A circuit arrangement for an electronic ripple control receiver - Google Patents

A circuit arrangement for an electronic ripple control receiver Download PDF

Info

Publication number
GB2171278A
GB2171278A GB08602263A GB8602263A GB2171278A GB 2171278 A GB2171278 A GB 2171278A GB 08602263 A GB08602263 A GB 08602263A GB 8602263 A GB8602263 A GB 8602263A GB 2171278 A GB2171278 A GB 2171278A
Authority
GB
United Kingdom
Prior art keywords
circuit arrangement
switching
switch members
evaluation section
energy store
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
GB08602263A
Other versions
GB8602263D0 (en
GB2171278B (en
Inventor
Beat Mueller
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.)
Zellweger Uster AG
Original Assignee
Zellweger Uster 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 Zellweger Uster AG filed Critical Zellweger Uster AG
Publication of GB8602263D0 publication Critical patent/GB8602263D0/en
Publication of GB2171278A publication Critical patent/GB2171278A/en
Application granted granted Critical
Publication of GB2171278B publication Critical patent/GB2171278B/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • H02J13/00009—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission using pulsed signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2203/00—Indexing scheme relating to line transmission systems
    • H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
    • H04B2203/5462—Systems for power line communications
    • H04B2203/5495—Systems for power line communications having measurements and testing channel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Selective Calling Equipment (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

The circuit arrangement has an evaluation section 26 for evaluating the received remote control signals, switch members 35 which can be controlled by the evaluation section and a switching energy store 44 assigned to the switch members for the operation thereof. The evaluation section 26 is formed by a microcomputer and a circuit having a reference element 52 and a switching element 56 for monitoring the energy content of the switching energy store 44 is provided, which when the energy content falls short of the limit value, delays the control of the switch members 35 until this limit value is reached again. This delay takes place by temporary storage of the received remote control signals in the microcomputer 26. Several switch members can thereby be safely operated by a ripple control receiver without the energy content of the switching energy store or the performance of the current supply part having to be correspondingly increased. <IMAGE>

Description

SPECIFICATION A circuit arrangement for an electronic ripple control receiver This invention relates to a circuit arrangement for an electronic ripple control receiver which has an evaluation section for evaluation received remote control signals, switch members which can be controlled by the evaluating section, as well as a switching energy store assigned to the switch members for the operation thereof.
A ripple control receiver of this type is described in Swiss Patent No. 567 824. This ripple control receiver should replace the LC-oscillating circuits or electromechanical resonance formations used in the ripple control receivers known so far in the input section and the electromechanical switching device in the evaluating section by completely electronic circuits, particularly by a single integrated switching circuit. As a single electromechanical switching element, this electronic ripple control receiver merely has a switch member which can be operated by the evaluation section, for example, a current pulse switch.
By using integrated circuits, the possibility arose of providing a control supply section with a very low output; however, the high energy requirement for operating the current impulse switch was inconsistent with this. This contradiction was resolved in the known ripple control receivers by a switching energy store, for example a capacitor with a high capacity, which is kept in a charged state via a charge path from the current supply section of the ripple control receiver, so that it can release in a short time the switching energy required during the operations of the switch member taking place relatively infrequently and at long time intervals.
The latter precondition, namely infrequent operation of the switch member at long intervals, continues to exist. However, ripple control receivers exist which are equipped with several switch members which in certain cases receive the switching commands almost simultaneously. So as to be able to carry out these switching orders, either the output of the current supply section or the capacity of the switching energy store would have to be correspondingly increased. These two solutions, however, are uneconomical and thus disadvantageous.
The object of the invention is to provide a circuit arrangement for an electronic ripple control receiver, with the aid of which several switch members can be switched on safely using a current supply section with a low output and a switching energy store with an energy content which is as low as possible.
Accordingly, the present invention provides a circuit arrangement for an electronic ripple control receiver comprising an evaluation section for evaluating the received remote control signals, switch members which can be controlled by the evaluation section, a switching energy store assigned to the switch members for the operation thereof, and an arrangement for monitoring the energy content of the switching energy store which when the energy content falls short of a first limit value delays the control of the switch members until the energy content exceeds a second, no lower limit value.
The circuit arrangement according to the invention renders possible, by the proposed monitoring of the energy content of the switching energy store, the safe operation of several switch members, without the energy content of the switching energy store or the output of the current supply section having to be correspondingly increased. The invention thereby recognizes that it is unnecessary to carry out each received switching command instantly, but that delays of a few milliseconds or even seconds are by all means tolerable, so that the control of the switch members can be delayed if the energy content of the switching energy store is insufficient, until it has an adequate energy content or, in other words, is charged again.
An embodiment of the invention is described in more detail below by example only and with reference to the drawing, wherein the single figure shows a simplified circuit diagram of an electronic ripple control receiver with a remote control switch member.
The ripple control receiver marked 1 in the figure is connected by its input terminals 2 and 3 to two conductors 4 and 5 of an alternating current mains 6, on which are superimposed in known manner remote control commands in the form of alternating current pulse sequences. Thus, on the inputtermin- als 2 and 3, in addition to the mains alternating voltage UN, the signal voltage Us superimposed thereon is also present. The conductor 4 can, for example be a phase conductor and the conductor 5 can be a zero conductor.
For the current supply of the electronic ripple control rceiver 1, a current supply section 7 is provided which has connected to the input terminals 2 and 3 a series circuit with a protective impedance 8, a series capacitor 9 and a full-wave rectifier 10.
The full-wave rectifier 10 designed as a bridge rectifier is situated with its alternating current terminals 11 and 12 in the said series circuit, while to the direct current terminals, that is to the negative pole 13 and to the positive pole 14, a filter capacitor 15 and a voltage limiter 16, for example a Zenerdiode are connected. The protective impedance 8 can, for example, be a pulse voltage-resistant resistor or a pulse voltage-resistant choke coil.
The series capacitor 9 switched on in series with the alternating current terminals 11 and 12 of the full-wave rectifier 10 produces, based on the mains voltage UN, the voltage reduction necessary for operating the electronic circuit of the ripple control receiver 1. For this operation, only a relatively low direct voltage of 20 V, for example, is necessary. The current consumption of the electronic circuit is very modest, so that the current supply section 7 has only a low output of, for example, about 0.3 watts.
From a connection 17 between the protective impedance 8 and the series capacitor 9, a line 18 leads, on the one hand to an input 19 of a frequencyselective receiving section 20 and on the other hand to an RC-section 27 consisting of a resistor 28 and a capacitor 29. The receiving section 20 which, for example, has active RC-filters as selection means for the remote control frequency, is on the one hand connected to a negative rail 21 and on the other hand to a positive rail 22 and thereby receives the necessary supply voltage from the current supply section 7. An output terminal 23 of the receiving section 20 is connected via a line 24to a first input 25 of the evaluation section 26 of the ripple control receiver 1. At a second input 32 of the evaluation section 26 is situated a line 31 which branches off from a connection 30 between the resistor 28 and the capacitor 29.
Via the RC-section 27, a mains frequency signal is supplied to the second input 32 of the evaluation section 26, with the aid of which in the evaluation section 26 a succession of clock pulses, set to the mains frequency, is built up as an electronic time basis for evaluating the received pulse sequences.
The breakdown frequency of the RC-section is about 10 Hz, so that the constantly present mains harmonics are attenuated relative to the mains frequency.
The evaluation section 26 which is connected to the negative and positive rails 21 and 22 and thereby receives the necessary supply voltage from the current supply section 7, is produced as a one-chip microcomputer which is fast-programmed, preferably mask-programmed. Since electronic evaluation sections are known for ripple control receivers, further details can be dispensed with here. Attention is drawn merely to the fact that the evaluation section 26 contains, among other things, electronic stores and shift registers for the periodic storage of received pulse sequences.Each of these stored pulse sequences is compared with a pulse sequence (remote control order) assigned to the relevant ripple control receiver and if the result of the comparison is positive, an approval signal is released by a first or second output 33 or 34 of the evaluation section 26 as an operating signal for a switch 35 to be remote controlled.
According to the Figure, a switch 35' belongs to the switch member 35, and depending on at which of the two outputs 33 or 34 the approval signal is released, the switch 35' is switched on or off, whereby a current consumer 36 is connected to the mains 6 or disconnected therefrom.
To operate the switch 35', a switching transistor 37 or 38 is controlled via the signal released at the output 33 or 34 of the evaluation section 26, so that one of the two coils 39 and 40 of a relay 41 conducts current and thereby switches the switch 35' on and off. Protective diodes 42 and 43 are connected in parallel with the coils 39 and 40 in order to protect the transsistors 37 and 38 against inductive voltage pulses.
Since the receiving section 20 and the evaluation section 26 of the ripple control receiver 1 only have a low output requirement of 0.2 watts, for example, the current supply section 7 is, for economical reasons, only constructed to give a relatively low output. For operating the switch member 35, however, a relatively high output is temporarily required, which the small current supply section 7 could not deliver within a sufficiently short time. For this reason, a switching energy store 44 in the form of a store capacitor with an adequate capacity of, for example, 200 if is assigned to the switch member 35.
The switching energy store 44 is connected to the current supply section 7 via a charge path 45 which has a resistor 46. The resistor 46 can be relatively high-ohmic and have a value of, for example, 400 Ohm. The switching energy store 44 is then relatively slowly charged from the current supply section 7, but is then constantly kept in a charged state so that it can release the energy necessary for a switching process at any time on request. As long as the mains voltage UN iS present on the terminals 2 and 3, the switching energy store 44 is charged and owing to the very low leakage current retains its charge over a relatively long time even if the mains voltage fails.
During a temporary failure of the mains voltage, the supply voltage released by the current supply section 7 for the receiving section 20 and the evaluation section 26 falls and after a short time will fall short of the minimum voltage value for correct functioning. It is then posible for indefinite signals to be released at the outputs 33 and 34 which, in conjunction with the fact that the switching energy store 44 can still release sufficient energy over a relatively long time for operating the switch member 35, can lead to faulty operation of the switch member 35 and of the switch 35'.
In order to avoid such undesirable switching processes not triggered by remote control orders, a discharge path 47 with a diode 48 is assigned to the charge path 45, the transmission of which is directed to the current supply section 7. As soon as the supply voltage of the current supply section 7 falls by the initial voltage of the diode 48 below the voltage of the switching energy store 44, the receiving section 20 and the evaluation section 26 are provided with energy from the switching energy store via the diode 48 and the supply voltage of the receiving section 20 and evaluation section 26 falls simultaneously and uniformly with the voltage present on the switch member 35. As soon as the mentioned minimum voltage value is fallen short of as the supply voltage falls, faulty operation of the switch member 35 could occur again.This is prevented, however, by the pick-up voltage of the switch member 35 being selected higher than this lower limit value for the supply voltage of the evaluation section 26. For when this limit value has been fallen short of, faulty operation of the switch member 35 can no longer occur since the voltage still applied to the switching energy store 44 is too low to initiate the relay 41.
The presence of only one switch member 35 with a switch 35' drawn on the Figure should not be seen as limiting the invention, but the switch member 35 should be seen as representative of several switch members as ripple control receivers are capable of receiving switching orders at short intervals for several switch members 35.
It would be natural to construct the switching energy store 44 such that it can switch on all connected switch members 35 simultaneously or within short intervals of each other, without charging having to take place in between. According to the invention, however, another, cheaper solution is proposed: this assumes that on receiving switching orders for several switch membrs 35, these switching orders need not be carried out instantly but that time delays of the order of a few seconds are no problem and are thus tolerated. The solution according to the invention consists in monitoring the voltage via the switching energy store 44 and in the case of a voltage which is insufficient for carrying out a switching order, the control of the corresponding switch member or the corresponding switch members 35 is delayed until the switching energy store 44 is charged again.
According to the Figure, a line 51 with a Z-diode 52 and a resistor 53 is arranged parallel with the switching energy store 44 between the cathode 49 and anode 50 thereof. A line 54 branching off from the positive rail 22 leads to the emitter terminal of a transistor 56, the collector terminal of which is connected via a resistor 55 to the negative rail 21 and the base thereof via a resistor 57 to the line 51 containing the Z-diode 52. The evaluation section 26 has a third input 58 to which is connected a signal line 59 branching off from the collector terminal of the transistor 56.
The Z-diode 52 acts as voltage reference for the switching energy store 44. For as long as the voltage via the switching energy store 44 is lower than the Zener voltage of the Z-diode 52, no current can flow from the positive rail 22 via the resistor 53 and the Z-diode 52 to the cathode 49 of the switching energy store 44.
However, also no emitter-base current can flow from the positive rail 22 via the line 54 into the transistor 56 and via the resistor 57 into the Z-diode 52 to the cathode 49 of the switching energy store 44. The circuit transistor 56 thus has a blocking action and the signal line 59 connected thereto assumes the potential of the negative rail 21 since it is connected thereto via the resistor 55.
The evaluation section 26 formed by a microcomputer can in addition to the already described functions read in the input 58 and process it in its programme. The microcomputer is programmed such that when the input 58 assumes the potential of the negative rail 21, that is when the voltage via the switching energy store 44 is lower than the Zener voltage of the Z-diode 52, it stores relevant switching orders for the relay 41 and does not carry them out.
The evaluation section 26 does not carry out the stored and/or the optionally new switching orders until the input has assumed the potential of the positive rail 22.
The input 58 only assumes the potential of the positive rail 22 when the transistor 56 conducts.
However, this is only the case when a Zener current can flow through the Z-diode 52, thus the voltage via the switching energy store 44 is greater than the Zener voltage. An emitter base current can then flow from the transistor 56 via the resistor 57 and the Z-diode 52, which switches the switching transistor 56.

Claims (9)

1. A circuit arrangement for an electronic ripple control receiver comprising an evaluation section for evaluating the received remote control signals, switch members which can be controlled by the evaluation section, a switching energy store assigned to the switch members for the operation thereof, and an arangementfor monitoring the energy content of the switching energy store which when the energy content falls short of a first limit value delays the control of the switch members until the energy content exceeds a second, no lower limit value.
2. A circuit arrangement according to claim 1, wherein the two limit values of the energy content are equal.
3. A circuit arrangement according to claim 2, wherein the arrangement for monitoring the energy content has a measuring connection for measuring the voltage on the switching energy store and an information store for the temporary storage of the received remote control signals.
4. A circuit arrangement according to claim 3, wherein the evaluation section is formed by a microcomputer and the information store is integrated therein.
5. A circuit arrangement according to claim 3 or 4, wherein the measuring connection has a reference element for the voltage corresponding to the minimum energy of the switching energy store necessary for operating the switch members as well as a switching element for releasing a signal to the evaluation section when the voltage corresponding to the minimum energy necessary and prescribed by the reference element is fallen short of.
6. A circuit arrangement according to claim 5, in which the switching energy store is formed by a capacitor and in which the reference element is formed by a Z-diode arranged parallel with the capacitor.
7. A circuit arrangement according to claim 6, wherein the switching element is formed by a transistor, the collector terminal of which is connected to the negative rail and the emitter terminal of which is connected to the positive rail or of the circuit arrangement and the base of which is connected to the line containing the Z-diode.
8. A circuit arrangement according to claim 2 or 7, wherein a signal line leads from the collector terminal of the transistor to an input of the microcomputer forming the evaluation section, and that the microcomputer is programmed so that when the said input assumes the potential of the negative rail, it does not carry out relevant switching orders for the switch members but stores them and does not release them until the potential of the positive rail is present at the input to the switch members.
9. A circuit arrangement substantially as herein described and as illustrated in the accompanying drawing.
GB08602263A 1985-02-15 1986-01-30 An electronic ripple control receiver Expired GB2171278B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH714/85A CH666771A5 (en) 1985-02-15 1985-02-15 CIRCUIT ARRANGEMENT FOR AN ELECTRONIC RADIO CONTROL RECEIVER.

Publications (3)

Publication Number Publication Date
GB8602263D0 GB8602263D0 (en) 1986-03-05
GB2171278A true GB2171278A (en) 1986-08-20
GB2171278B GB2171278B (en) 1988-10-12

Family

ID=4193449

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08602263A Expired GB2171278B (en) 1985-02-15 1986-01-30 An electronic ripple control receiver

Country Status (7)

Country Link
AT (1) AT383915B (en)
AU (1) AU596090B2 (en)
CH (1) CH666771A5 (en)
DE (1) DE3604753A1 (en)
FR (1) FR2577706B1 (en)
GB (1) GB2171278B (en)
NZ (1) NZ215158A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003792A1 (en) * 1994-07-28 1996-02-08 Southpower Limited Device for energy load control
US5903213A (en) * 1994-07-28 1999-05-11 Southpower Limited Device for energy load control
US7409270B2 (en) 2005-11-28 2008-08-05 Landis+Gyr Ag Control apparatus for deactivating an electrical load during congestion periods

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH672565A5 (en) * 1986-12-09 1989-11-30 Zellweger Uster Ag

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH567824A5 (en) * 1973-07-13 1975-10-15 Zellweger Uster Ag
AU494904B2 (en) * 1975-09-24 1977-03-31 Ernest Zane And John Barkley Foster James Rooftop container
US4429366A (en) * 1981-04-09 1984-01-31 Westinghouse Electric Corp. Microprocessor-based load management terminal with reset
DE3315393A1 (en) * 1983-04-28 1984-10-31 Siemens AG, 1000 Berlin und 8000 München POWER SUPPLY FOR SERIES-SUPPLIED ELECTRONIC CIRCUITS

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996003792A1 (en) * 1994-07-28 1996-02-08 Southpower Limited Device for energy load control
AU675192B2 (en) * 1994-07-28 1997-01-23 Cic Global Llc Device for energy load control
US5903213A (en) * 1994-07-28 1999-05-11 Southpower Limited Device for energy load control
US7409270B2 (en) 2005-11-28 2008-08-05 Landis+Gyr Ag Control apparatus for deactivating an electrical load during congestion periods

Also Published As

Publication number Publication date
AU596090B2 (en) 1990-04-26
AT383915B (en) 1987-09-10
AU5322586A (en) 1986-08-21
GB8602263D0 (en) 1986-03-05
FR2577706A1 (en) 1986-08-22
NZ215158A (en) 1989-01-27
DE3604753A1 (en) 1986-08-21
GB2171278B (en) 1988-10-12
ATA986A (en) 1987-01-15
FR2577706B1 (en) 1989-06-16
CH666771A5 (en) 1988-08-15

Similar Documents

Publication Publication Date Title
US6509658B1 (en) Device for the automatic shut-off of equipment&#39;s stand-by power
CA1093669A (en) Multiple power source automatic switching circuitry
US5930130A (en) Inrush protection circuit
US5939803A (en) System for off-mains switching of current consuming devices such as actuators
US4678985A (en) Two-terminal line-powered control circuit
US4437134A (en) Discharge circuit for rapidly eliminating charge trapped in a capacitor voltage divider used for monitoring high voltage AC
US4415837A (en) Starting circuit for gaseous discharge lamps
US20030160573A1 (en) Auxiliary controller
US4489253A (en) Automatic degaussing circuit with switch mode power supply
GB2171278A (en) A circuit arrangement for an electronic ripple control receiver
US3916211A (en) Circuit arrangement for an electronic remote control receiver
US20200280208A1 (en) Automatic ac feed control (afc) with zero voltage/current switching
US3906251A (en) Plurality of selective sources for converter system
FI62442B (en) MATNING AV HYSTERESSPAENNING TILL EN GENERATOR FOER SYNKRONISERING AV AVLAENKNINGEN
JPH05276465A (en) Power supply switch circuit
US4361731A (en) Coin telephone control circuit
JPS6139851A (en) Circuit device for monitoring thyristor
CN1019159B (en) Memory retention system for volatile memory devices
SU902153A1 (en) Redundancy power supply of load
SU1450041A1 (en) Method and apparatus for automatic charging and discharging of storage battery
SU1610604A1 (en) Device for controlling wire radio speaker
SU1410178A1 (en) Apparatus for protecting three-phase user from phase failure
SU1394364A1 (en) Single-cycle d.c. voltage converter
JP3226079B2 (en) Signal generation circuit
SU1737686A1 (en) Device for starting of three-phase asynchronous electric motor

Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 20060129