EP0771518B1 - Systeme de regulation d'alimentation electrique - Google Patents

Systeme de regulation d'alimentation electrique Download PDF

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Publication number
EP0771518B1
EP0771518B1 EP95925944A EP95925944A EP0771518B1 EP 0771518 B1 EP0771518 B1 EP 0771518B1 EP 95925944 A EP95925944 A EP 95925944A EP 95925944 A EP95925944 A EP 95925944A EP 0771518 B1 EP0771518 B1 EP 0771518B1
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EP
European Patent Office
Prior art keywords
winding
terminal
monitoring
voltage
switching means
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Expired - Lifetime
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EP95925944A
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German (de)
English (en)
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EP0771518A1 (fr
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John Arthur Lawrence
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Individual
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Individual
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Priority claimed from GB9414665A external-priority patent/GB9414665D0/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/40—Controlling the intensity of light discontinuously
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
    • G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices

Definitions

  • the present invention relates to an electrical power control circuit and more particularly to an electrical power control circuit for electrical lighting systems, for example fluorescent lighting systems in large commercial buildings.
  • a known power control system for providing a reduced voltage to fluorescent lamps in an electrical lighting arrangement is summarized in the pre-characterising portion of claim 7 and is disclosed in WO-A-88/03353.
  • a transformer provides a reduced voltage which can be supplemented by a further transformer up to a normal mains voltage for the purpose of enabling the fluorescent lamps to strike. The further transformer is then disabled so that the reduced voltage is again applied for running the lighting system thereby reducing power consumption.
  • any voltage reduction should not result is a perceptibly dimmer light output.
  • Another known power control system for providing a reduced voltage to fluorescent lamps in an electrical lighting system involves the use of a plurality of switchable transformers which at start up are switched out so that a normal mains voltage is applied directly to the lighting. Then, they are switched in to provide the reduced lighting.
  • a power surge generated when disconnecting the transformer if it is operating.
  • a 10 KVA transformer for a bank of up to 200 lamps could generate a surge of 400 amps when switched in this way
  • the switching contacts would rapidly degrade leading to un-reliability.
  • these type of systems have not been used due to their failure rate.
  • a method of controlling an electrical power system for providing one of a plurality of selected voltages to a load comprising the steps of:-
  • the present invention can provide a number of different output voltages at the output terminal according to demand. Furthermore, when a fault condition is monitored, a failsafe condition is provided wherein the effect of the winding is taken out of circuit in a safe way by disconnecting the winding from the neutral terminal and preventing turns of the winding being open circuit. Accordingly, damage to the winding and circuitry of the system in general is avoided.
  • step (c) comprises disabling the terminal connection means to electrically disconnect said other end of said winding from the neutral terminal and enabling a switching means to electrically connect to the neutral terminal to exclude the predetermined number of turns of said winding located from said other end of the winding.
  • step (e) comprises disabling said terminal connection means and said switching means and enabling a further switching means to electrically short-circuit said other end of said winding to said predetermined position.
  • the winding can be disconnected from the neutral terminal in a safe and effective manner whilst preventing turns of the winding from being open circuit.
  • the method further comprises the step of monitoring for an increased load demand and stopping step (c) in response to a predetermined load demand.
  • the method further comprises the step of monitoring the voltage to said one end of the winding and stopping step (c) in response to the voltage falling below a predetermined value.
  • the method further comprises the step of supplying said request for another selected voltage after the lapse of a predetermined time interval following supply of power being required.
  • an electrical power control system for providing one of a plurality of selected voltages to a load, the electrical power control system comprising:-
  • said switching means is connected to the neutral terminal to exclude the predetermined number of turns of said winding from said other end of the winding.
  • said monitoring means in response to monitoring of a fault condition, disables said terminal connection means and said switching means to electrically disconnect said other end of the winding from the neutral terminal and enables said further switching means.
  • said monitoring means further comprises a current demand sensing means for sensing for transient current changes in the current demand by the load; wherein said monitoring means disables said switching means in response to transient changes in current above a predetermined level.
  • said monitoring means further comprises a current overload monitoring means for monitoring current to the winding; wherein said monitoring means disables said terminal connection means and said switching means to electrically disconnect said other end of the winding from the neutral terminal and enables said further switching means in response to a monitored current above a predetermined maximum level.
  • said monitoring means further comprises a voltage monitoring means for monitoring voltage to said one end of the winding; and wherein said monitoring means disables said switching means in response to a voltage below a predetermined minimum.
  • said monitoring means further comprises timer means for measuring the time starting from a supply of said a selected voltage; wherein said monitoring means enables said switching means when said measured time exceeds a predetermined time interval.
  • said timer means monitors a further time starting from supply of said selected voltage; wherein said monitoring means enables said switching means only when said further time exceeds a further predetermined time interval during which the voltage to said one end of said winding has not fallen below said predetermined minimum.
  • timer means is reset whenever the switching means is disabled or said further switching means is enabled.
  • terminal connection means, the switching means and the further switching means comprise relay contacts.
  • system further comprises a zero crossing detector so that movement of the relay contacts can take place at zero crossing points.
  • a positive rail 1 has a positive terminal L for connection to a source of electrical power (not shown) and a neutral rail 2 has a neutral terminal N for connection to the source of electrical power.
  • a transformer winding 3 has a positive end 13 connected to the positive rail 1 and a neutral end 14 connected both to a terminal connection 4 and a terminal 15.
  • the terminal connection 4 can be electrically connected to a terminal 5, which is connected to the rail 2, by means of a relay contact 200A and the terminal 15 can be electrically connected to a terminal 7 by means of a relay contact 300A.
  • a terminal 17 is connected.
  • the terminal 17 can be electrically connected to the terminal 5 by means of a relay contact 100A.
  • the relay contacts 100A, 200A, and 300A are all normally open contacts. This is shown in figure 1. Only when their respective coils 100, 200 and 300 (described hereinafter) are energised, are the electrical connections made.
  • the transformer winding 3 is tapped at a predetermined point 18 which is connected to an output terminal T.
  • the transformer winding 3 has 126 turns between point 16 and the neutral end 14, 126 turns between the point 16 and tapping point 18, and 14 turns between the tapping point 18 and the positive end 13. It will be apparent therefore that by suitable operation of the relay contacts 100A and 200A, either the connection of the neutral end 14 to the neutral rail 2 via terminal 5 or the connection of the point 16 to the neutral rail 2 via terminal 17 and 5 can take place so that one of two selected reduced voltages can appear at terminal T.
  • the relay contact 300A is operated to short circuit the turns of the winding between point 18 and the neutral end 14 so that these are not able to be open circuit which would be detrimental to the condition of the transformer winding 3.
  • a sub-circuit of a monitoring means control circuit is connected between the rails 1 and 2.
  • This sub-circuit comprises a fuse 10 having one end connected to the rail 1 and the other end connected to a terminal point of a normally open relay contact 600A.
  • the relay contact 600A can make an electrical connection to a terminal point which is connected to one side of a heat sensor 12.
  • the other side of the heat sensor 12 is connected both to a coil 800 and to a terminal point of a normally closed relay contact 300B.
  • the relay contact 300B can make an electrical connection to a terminal point which is connected to a terminal point of a relay 500A contained with a box generally identified by reference numeral 51.
  • the relay contact 500A can make an electrical connection either to a terminal point connected to the coil 100, which is connected to the rail 2, or to both a lamp Am (Amber), which is connected to the rail 2, and a terminal point connected to the coil 200, which is connected to the rail 2.
  • a red lamp Rd is also connected from a point between fuse 10 and relay contact 600A, and the rail 2.
  • Another sub-circuit of the monitoring means control circuit is also connected between the rails 1 and 2.
  • This sub-circuit comprises a fuse 20 having one end connected to the rail 1 and the other end connected to a terminal point of a normally closed relay contact 100B.
  • the relay contact 100B can make an electrical connection to a terminal point which is connected to a terminal point of another relay contact 200B.
  • the relay contact 200B can make electrical contact with a terminal point which is connected to a fault condition unit.
  • the fault condition unit comprises a DC power supply which provides a 12 volt supply to one terminal of a normally open relay contact 800B.
  • the relay contact 800B can make an electrical connection to a coil 900 which is connected to the rail 2.
  • Another 12 volt supply is connected to one terminal of a normally open relay contact 700A.
  • the relay contact 700A can make electrical connection to the coil 300 which is connected to the rail 2.
  • a further 12 volt supply is connected to a terminal of a normally closed relay contact 800A and a terminal of a normally open relay contact 900A.
  • the relay contacts 800A and 900A can make electrical connection to one terminal of a manual reset switch 20.
  • the other terminal of the manual reset switch 20 is connected to a coil 700 which is connected to the rail 2.
  • a current sensor 21 in the form of a toroid is wound around the rail 1.
  • the output of the sensor 21 is connected to a first sub-circuit generally identified by reference number 52 and shown in detail in figure 4.
  • the output of sensor 21 is connected to a conversion network 24.
  • the network converts the current signal from sensor 21 and provides an output comprising a voltage which is proportional to the current flowing along the rail 1.
  • the voltage output from the network 24 is connected to a step sensor 22 and a level sensor 23.
  • the step sensor 22 detects the rise in level of the input value from the network 24 against the preceding input value. In this way, it is possible to detect when the load connected to terminal T varies so that an increased voltage may be required, for example in the case of fluorescent lighting, the variation in load implies switching on of lighting.
  • a null circuit can be included which effectively stops the sensing for a brief period of time during switching of, say, relay contact 500A.
  • step sensor 22 detects an increase in current
  • a signal is sent to short timer 25 which is reset and started.
  • the output of short timer 25 is sent to gate logic 26 for controlling a switch 27 to enable or disable the coil 500.
  • the level sensor 23 detects an initial current level and outputs a signal to a gate 28 for controlling a switch 29 to enable or disable the coil 600. In the event that the current level exceeds a predetermined maximum, the level sensor 23 outputs a signal to the gate logic 26.
  • a voltage sensor 30 detects the voltage on the positive rail 1 via a wipe located on the relay contact 600A. When the voltage drops below a certain level, a signal is sent to gate logic 26 and also to a long timer 31 which is reset and started. The output of the long timer is sent to the gate logic 26.
  • Figure 1 illustrates the initial position when power is first supplied to terminals L and N.
  • an initial current flow occurs along rail 1 and through some turns of the winding 3 of the transformer to the output terminal T since the relay contacts 100A, 200A and 300A are in their normally open position, but those turns do not offer any significant impedance for such a short amount of time.
  • lamp Rd is lit via fuse 10 showing not only the presence of a supply voltage, but that fuse 10 has not blown.
  • the current sensor 21 senses this flow of current.
  • the level sensor 23 outputs a signal to gate 28 along line 40.
  • the logic of gate 28 provides a signal to switch 29 so that coil 600 is supplied with current so as to energise the coil and hence close relay contact 600A.
  • coil 800 Since coil 800 is now carrying current, the relay contact 800B closes and the relay contact 800A opens. However, current will not flow for long through fuse 20 because with the energisation of the coil 200, the relay contact 200B opens. It will be appreciated that coils 700 and 900 are designed to be slow to operate in response to energisation (say 100 ms) so that the reaction of their respective relays does not take place before the relay contact 200B opens. Thus, there is no risk that coil 300 may become energised to close relay contact 300A. The above situation is shown in figure 2.
  • the current sensor 21 senses the initial flow of current through rail 1.
  • the step sensor 22 detects a step in the current and outputs a signal to short timer 25 and a signal to gate logic 26 along line 41.
  • the gate logic 26 By means of the gate logic 26, the presence of a signal on line 41 inhibits switch 27 from energising coil 500, which remains in its initial position.
  • the step sensor has detected the initial flow of current for a predetermined time, no further step is detected and hence the signal on line 41 disappears.
  • the voltage sensor 30 senses a voltage above a predetermined minimum level and outputs a signal to the long timer 31 and to the gate logic 26 along line 42.
  • the gate logic 26 will not operate to turn on switch 27 if there is a signal on line 41 indicating a step in current demand or if there is no signal on line 42 which indicates insufficient voltage or if both the short timer 25 and long timer 31 have timed out and output signals on their respective lines 43 and 44.
  • relay contact 200B now closes and relay contact 100A opens, there remains no current flow through the circuit incorporating these relay contacts.
  • the circuit of this embodiment incorporates fault monitoring so as to provide a number of safety features.
  • the present embodiment can provide a failsafe condition in the event of failure of the relay contact operating coils, general overloading of the system, a fault external to the system creating an overload condition, a fault in the winding causing a thermal build up and operating the heat sensor 12, a fault causing the fuse 10 to blow, a disconnection in the sub circuit wiring causing the relay contacts 100A or 200A to release, and any failure which causes the winding to go open circuit.
  • the latter three relay contacts closing provides for a flow of current which energises coil 700 via manual reset switch 20.
  • the coil 700 causes the relay contact 700A to close which provides a flow of current through coil 300.
  • the relay contact 300A closes to connect terminals 15 and 7 thereby putting a short circuit across the primary turns of the winding 3 between points 18 and 14. Consequently, the magnetic field is collapsed so that the winding 3 ceases to operate as a transformer and offers substantially no impedance between points 13 and 18.
  • closing relay contact 300A has the effect that the electrical power supply system of the present invention is bypassed.
  • damage to the winding 3 that could otherwise occur from being open circuit is avoided so that a failsafe condition can be provided.
  • the situation of leaving such an open circuit should be considered. If an open circuit occurs for any length of time, there will be a voltage drop between points 13 and 16, in the present case 24 volts, so that the electrical power supply system of the present invention is not bypassed and hence a true failsafe condition is not provided.
  • there will be a reversing energisation of the winding which will lead to an unpleasant and disturbing vibration in the form of a hum or buzz.
  • the winding will eventually reach a saturation voltage across the open circuit part of the winding.
  • This saturation voltage can reach quite high values, in the present case of the order of 760 volts, which is not only potentially very dangerous to anyone who should accidentally touch the system but can also produce sparking due to breakdown of the insulation thereby producing a winding insulation failure.
  • relay contact 300B opens relay contact 300B so that electrical operation of coils 100 and 200 and their respective relay contacts is inhibited. If the current flowing along rail 1 drops again, the signal along line 45 disappears and gate 28 turns switch 29 back on so that coil 600 is again energised.
  • the sub-circuit shown in figure 4 is arranged such that the relay contact 200A closes when current flows again along rail 1. This can be achieved by making sure that long timer 31 is reset, say by interrupting the voltage sensing of voltage sensor 30. In this respect, it will be noted that regardless of the current flow, if the voltage on rail 1 drops below the predetermined level, long timer 31 is reset so that relay contact 500A automatically returns to the position connected to coil 200.
  • relay contact 300A is closed with the same effects as above.
  • relay contact 800A opens breaking the current path to coil 700. This results in its relay contact 700A opening so that current no longer flows to coil 300. The effect of this is for its relay contact 300B to close to again provide current to energise coil 100 or 200. It will be appreciated that although relay contact 800B is closed, coil 900 is slow to operate so that relay contact 900A does not operate in time to provide an alternative current path to coil 700. Thus, the system is restarted.
  • relay contacts 100A or 200A should open due to mechanical or electrical failure.
  • contact 800B is closed due to current flowing through coil 800
  • coil 900 is not provided with current because either relay contact 100A or 200B is open.
  • that open relay contact will close so that current is now supplied to coil 900.
  • relay contact 900A will close so that current is supplied to coil 700 via manual switch 20 which eventually causes relay contact 300A to operate as above. It should be noted that this locks the system so that physical inspection of the system is required. However, power will still be supplied to the load connected to terminal T.
  • relay contact 300A whilst relay contacts 100A or 200A are actuated is prevented not only electrically, but also mechanically by interlocking the contacts so that relay contact 300A is positioned between the relay contact 100A and 200A so that operation of either of them inhibits operation of relay contact 300A and operation of relay contact 300A inhibits relay contact 100A and 200A.
  • the system can be returned to normal running by actuation of the reset switch 20 which breaks the current supply to coil 700 which will then break the supply of current to coil 300 so that relay contact 300A opens and either relay contact 100A or 200A closes.
  • Figure 5 illustrates a second embodiment of the present invention wherein common components with the first embodiment bear common reference numerals.
  • the relay contact 200B is now connected to one terminal of a normally open relay contact 1000A and to a coil 1000 which is connected to the rail 2.
  • the relay contact 1000A can make electrical connection to one terminal of the relay contact 800B, to one terminal of the normally open relay contact 700A, to one terminal of the normally closed relay contact 800A, and to one terminal of the normally open relay contact 900A.
  • the remaining connections are common to figure 1.
  • a green lamp Gr is connected across the coil 100 and a blue lamp is connected across the coil 300.
  • relay contact 1000A closes to supply current to the fault condition unit so that it can operate as described above.
  • relay contact 200A can be left connected whilst relay contact 100A connects.
  • relay contacts 100A and 200A are provided to enable the supply of two selected voltages at terminal T, further relay contacts can be provided to enable the supply of more than two selected voltages.
  • the embodiments described are fully automated with automatic reset and constant sensing for faults.
  • the present embodiment describes the switching from the relay contact 100A to the relay contact 200A in the circumstances of when power demand occurs when switching a load connected to terminal T, when a low incoming voltage occurs, when any failure in the sub circuit of figure 4 occurs or when any circuit fault creating current fluctuation in excess of a predetermined level, costs can be saved by incorporating fewer responses to these circumstances.
  • some of these aspects can be omitted to save costs, say the short and long timer can be replaced by a simple time delay relay to switch relay contact 500A.
  • the voltage sensor and step sensors shown in figure 4 can be omitted.
  • relay contact 500A in box 51 is shown as a relay contact which can be operated by a coil. It will be appreciated that control of the operation of the relay contact within box 51 can take many forms. For example, it can be dependent on a complex of timers, for example as shown in figure 4, or it can be dependent on a time delay relay. The latter is particularly appropriate for the control of loads having just one or two units, such as street lighting.
  • the current sensor 21 is located on the rail 1, it will be appreciated that the current sensor could be located on the rail connected to terminal T.
  • the present embodiment provides a system which can output a voltage which can be switched between a level approximating to mains voltage (or a chosen voltage) and a fully reduced level at switch on of the load, and to a reduced voltage value which does not produce a noticeable drop in effect on the load, say illumination of lighting, but which provides a substantial improvement in economy whilst all the time providing a secure and reliable failsafe condition in the event of a fault thereby enhancing the safety of the system and ensuring that the system complies with various legal requirements.

Claims (17)

  1. Procédé de commande d'un système d'alimentation électrique pour fournir l'une parmi plusieurs tensions sélectionnées à une charge, le procédé comprenant les étapes consistant à :
    (a) connecter électriquement l'une des extrémités d'un enroulement (3) à la borne positive (L) d'une source de courant électrique, l'enroulement étant dérivé à une position prédéterminée (18) pour délivrer une tension sélectionnée à une borne de sortie (T) ;
    (b) mettre en circuit un moyen de raccord terminal (200A) pour connecter électriquement l'autre extrémité (14) dudit enroulement à une borne neutre (N) de ladite source de courant électrique en réponse à une demande d'alimentation en courant ;
    (c) exclure un nombre prédéterminé de spires dudit enroulement en réponse à une demande pour une autre tension sélectionnée ;
    (d) surveiller pour détecter au moins un type d'état de défaillance ; et
    (e) déconnecter électriquement l'enroulement de la borne neutre et court-circuiter électriquement ladite autre extrémité de l'enroulement à ladite position prédéterminée lorsqu'un état de défaillance est détecté.
  2. Procédé selon la revendication 1, dans lequel l'étape (c) comprend la mise hors circuit du moyen de raccord terminal pour déconnecter électriquement de la borne neutre ladite autre extrémité dudit enroulement, et la mise en circuit d'un moyen de commutation (100A) pour se connecter électriquement à la borne neutre pour exclure de ladite autre extrémité de l'enroulement un nombre prédéterminé de spires dudit enroulement.
  3. Procédé selon la revendication 2, dans lequel l'étape (e) comprend la mise hors circuit dudit moyen de raccord terminal et dudit moyen de commutation, et la mise en circuit d'un autre moyen de commutation (300A) pour court-circuiter électriquement ladite autre extrémité dudit enroulement à ladite position prédéterminée.
  4. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre l'étape de surveillance d'une demande de charge accrue et une étape d'arrêt (c) en réponse à une demande de charge prédéterminée.
  5. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre l'étape de surveillance de la tension à la première extrémité précitée de l'enroulement et une étape d'arrêt (c) en réponse à la chute de la tension au-dessous d'une valeur prédéterminée.
  6. Procédé selon l'une quelconque des revendications précédentes, comprenant en outre l'étape consistant à adresser ladite requête pour une autre tension sélectionnée après l'écoulement d'un intervalle de temps prédéterminé après la demande d'alimentation en courant.
  7. Système de commande d'alimentation électrique pour fournir l'une parmi plusieurs tensions sélectionnées à une charge, le système de commande d'alimentation électrique comprenant :
    une borne positive (L) et une borne neutre (N) en vue de la connexion à une source de courant électrique ;
    une borne de sortie (T) pour fournir plusieurs tensions sélectionnées ;
    un enroulement (3) ayant une extrémité (13) connectée électriquement à la borne positive et étant dérivé à une position prédéterminée (18) pour délivrer une tension sélectionnée à la borne de sortie (T),
    caractérisé par :
    un moyen de raccord terminal (200A), capable d'être mis en circuit pour connecter électriquement l'autre extrémité (14) de l'enroulement à la borne neutre ;
    un moyen de commutation (100A), capable d'être mis en circuit pour exclure un nombre prédéterminé de spires dudit enroulement en réponse à une demande pour une autre tension sélectionnée ;
    un moyen de surveillance pour surveiller au moins un type d'état de défaillance ; et
    un autre moyen de commutation (300A), capable d'être mis en circuit pour court-circuiter électriquement ladite autre extrémité de l'enroulement à ladite position prédéterminée lorsqu'un état de défaillance est détecté.
  8. Système selon la revendication 7, dans lequel ledit moyen de commutation (100A) est connecté à la borne neutre (N) pour exclure de ladite autre extrémité de l'enroulement le nombre prédéterminé de spires dudit enroulement.
  9. système selon la revendication 8, dans lequel, en réponse à la détection d'un état de défaillance, ledit moyen de surveillance met hors circuit ledit moyen de raccord terminal (200A) et ledit moyen de commutation (100A) pour déconnecter électriquement de la borne neutre ladite autre extrémité de l'enroulement, et met en circuit ledit autre moyen de commutation (300A).
  10. Système selon l'une quelconque des revendications 7 à 9, dans lequel ledit moyen de surveillance comprend en outre un moyen (21) de détection de la demande en courant pour détecter des changements de courant transitoires dans la demande en courant par la charge ; dans lequel ledit moyen de surveillance met hors circuit ledit moyen de commutation en réponse à des changements transitoires dans le courant au-dessus d'un niveau prédéterminé.
  11. Système selon l'une quelconque des revendications 7 à 10, dans lequel ledit moyen de surveillance comprend en outre un moyen de surveillance d'une surcharge de courant pour surveiller du courant à l'enroulement ; dans lequel ledit moyen de surveillance met hors circuit ledit moyen de raccord terminal et ledit moyen de commutation pour déconnecter électriquement de la borne neutre ladite autre extrémité de l'enroulement, et met en circuit ledit autre moyen de commutation en réponse à un courant détecté au-dessus d'un niveau maximal prédéterminé.
  12. Système selon l'une quelconque des revendications 7 à 11, dans lequel ledit moyen de surveillance comprend en outre un moyen (30) de surveillance de tension, pour surveiller la tension à la première extrémité précitée de l'enroulement ; et dans lequel ledit moyen de surveillance met hors circuit ledit moyen de commutation en réponse à une tension au-dessous d'un minimum prédéterminé.
  13. Système selon l'une quelconque des revendications 7 à 12, dans lequel ledit moyen de surveillance comprend en outre un moyen d'horloge (25, 31) pour mesurer le temps à partir d'une délivrance de ladite tension sélectionnée ; dans lequel ledit moyen de surveillance met en circuit ledit moyen de commutation lorsque ledit temps mesuré dépasse un intervalle de temps prédéterminé.
  14. Système selon l'une des revendications 12 et 13, dans lequel ledit moyen d'horloge surveille un autre temps partant de la délivrance de ladite tension sélectionnée ; dans lequel ledit moyen de surveillance met en circuit ledit moyen de commutation seulement lorsque ledit autre temps dépasse un autre intervalle de temps prédéterminé pendant lequel la tension à la première extrémité précitée dudit enroulement n'est pas tombée au-dessous dudit minimum prédéterminé.
  15. système selon l'une des revendications 13 ou 14, dans lequel ledit moyen d'horloge est remis à zéro chaque fois que le moyen de commutation est mis hors circuit ou que ledit autre moyen de commutation est mis en circuit.
  16. Système selon l'une quelconque des revendications 7 à 15, dans lequel le moyen de raccord terminal, le moyen de commutation et l'autre moyen de commutation comprennent des contacts de relais.
  17. système selon la revendication 16 en tant qu'elle est dépendante de l'une quelconque des revendications 10 à 15, comprenant en outre un détecteur de croisement zéro, de telle sorte que le mouvement des contacts de relais puisse avoir lieu en des points optimaux pendant le cycle.
EP95925944A 1994-07-20 1995-07-20 Systeme de regulation d'alimentation electrique Expired - Lifetime EP0771518B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9414665A GB9414665D0 (en) 1994-07-20 1994-07-20 Improvements in and relating to control systems for electrical circuits
GB9414665 1994-07-20
GBGB9504282.6A GB9504282D0 (en) 1994-07-20 1995-03-03 Improvements in and relating to control systems for electrical circuits
GB9504282 1995-03-03
PCT/GB1995/001729 WO1996003018A1 (fr) 1994-07-20 1995-07-20 Systeme de regulation d'alimentation electrique

Publications (2)

Publication Number Publication Date
EP0771518A1 EP0771518A1 (fr) 1997-05-07
EP0771518B1 true EP0771518B1 (fr) 1999-01-20

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EP95925944A Expired - Lifetime EP0771518B1 (fr) 1994-07-20 1995-07-20 Systeme de regulation d'alimentation electrique

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EP (1) EP0771518B1 (fr)
JP (1) JP3746295B2 (fr)
CN (1) CN1087585C (fr)
AT (1) ATE176118T1 (fr)
AU (1) AU700796B2 (fr)
BR (1) BR9508791A (fr)
CA (1) CA2226498C (fr)
DE (1) DE69507484T2 (fr)
ES (1) ES2129838T3 (fr)
GB (1) GB2307119B (fr)
HK (1) HK1011517A1 (fr)
NZ (1) NZ289906A (fr)
WO (1) WO1996003018A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9081039B2 (en) 2012-05-17 2015-07-14 GM Global Technology Operations LLC Vehicle electrical system fault detection
FR3070225B1 (fr) * 2017-08-16 2019-09-20 Aksor Borne metier automatique
EP3975362A1 (fr) * 2020-09-24 2022-03-30 Volvo Truck Corporation Circuit de sécurité pour un système d'alimentation d'un véhicule et procédé de commande du circuit de sécurité

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189664A (en) * 1977-10-05 1980-02-19 Hirschfeld Richard L Power control unit for automatic control of power consumption in a lighting load
US4201938A (en) * 1978-10-02 1980-05-06 Siemens-Allis, Inc. Voltage regulator which eliminates arcing during tap changes
US4237403A (en) * 1979-04-16 1980-12-02 Berkleonics, Inc. Power supply for fluorescent lamp
US4513224A (en) * 1982-09-22 1985-04-23 Pacific Power Control, Inc. Fluorescent-lighting-system voltage controller

Also Published As

Publication number Publication date
CN1087585C (zh) 2002-07-10
CN1155967A (zh) 1997-07-30
GB9703695D0 (en) 1997-04-09
CA2226498C (fr) 2003-02-18
EP0771518A1 (fr) 1997-05-07
CA2226498A1 (fr) 1996-02-01
HK1011517A1 (en) 1999-07-09
ES2129838T3 (es) 1999-06-16
BR9508791A (pt) 1997-12-30
GB2307119A (en) 1997-05-14
DE69507484D1 (de) 1999-03-04
ATE176118T1 (de) 1999-02-15
MX9700481A (es) 1998-10-31
NZ289906A (en) 1998-10-28
JPH10504122A (ja) 1998-04-14
AU2988495A (en) 1996-02-16
AU700796B2 (en) 1999-01-14
GB2307119B (en) 1998-05-27
JP3746295B2 (ja) 2006-02-15
DE69507484T2 (de) 1999-09-02
WO1996003018A1 (fr) 1996-02-01

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