CN1087585C - Electrical power control system - Google Patents
Electrical power control system Download PDFInfo
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- CN1087585C CN1087585C CN95194706A CN95194706A CN1087585C CN 1087585 C CN1087585 C CN 1087585C CN 95194706 A CN95194706 A CN 95194706A CN 95194706 A CN95194706 A CN 95194706A CN 1087585 C CN1087585 C CN 1087585C
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- coil
- voltage
- switching device
- device shifter
- relay contact
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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
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- 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
Abstract
The present invention relates to an electrical power control circuit for loads such as fluorescent lighting systems. A winding (3) has a positive end (13) connected to a positive rail (1) and is tapped at a predetermined position (18) for supplying an output terminal (T) with a selected voltage. A first relay contact (200A) can electrically connect a neutral end (14) of the winding to a neutral rail (2) to provide one selected voltage or a second relay contact (100A) can electrically short-circuit a predetermined number of turns of the winding in response to a request for a second selected voltage. When a fault condition is monitored, a third relay contact (300A) can electrically short-circuit the neutral end (14) of the winding to said predetermined position (18) to put the system into a failsafe condition which prevents turns of the winding being open circuit.
Description
The present invention relates to a kind of control circuit power, more precisely, relate to a kind of control circuit power that is used for power lighting system (for example fluorescent lighting system of large-scale commercial building thing).
A kind of known fluorescent lamp that is used in the power lighting facility provides the electric control system that reduces voltage open in WO88/03353.In this file, a transformer provides the voltage of a reduction, and this voltage can add to normal supply voltage by another transformer, so that fluorescent lamp is triggered.Another transformer is disconnected, thereby apply the voltage of this reduction once more so that illuminator work reduces power consumption whereby.Certainly, any voltage reduces and should not cause light output to feel deepening.
The another kind of known fluorescent lamp that is used in the power lighting system provides the electric control system of the voltage of reduction, comprises a plurality of switchable transformers, and these transformers disconnect when starting, thereby a normal line voltage is directly used in illumination.Subsequently, they are switched on so that the step-down illumination to be provided.Yet, if when the transformer that cuts off is being worked, will produce power fluctuation.For example, one is used for the nearly 10KVA transformer of 200 lamps of a row, can produce 400 amperes fluctuation when connecting by this way.Wherein, the double-throw contact meeting damage rapidly and cause unreliable.Thereby these systems are not used owing to its failure rate.
The object of the present invention is to provide a kind of power circuit, this circuit has overcome the above problem when adopting switching transformer.
According to an aspect of the present invention, provide a kind of method of controlling electric power system, one of its a plurality of selection voltages offers a load, and this method comprises the steps:
(a) end of a coil is connected electrically to the anode of a power supply, this coil in the precalculated position tap so that the voltage of a selection of output to be provided;
(b), make a terminal jockey be connected electrically to the other end of described coil a neutral end of described power supply according to power reguirements;
(c) select the requirement of voltage according to another, the predetermined number of turn of removing described coil;
(d) fault state of at least a type of supervision; And
(e) when monitoring a fault state, this coil is electrically thrown off and the described other end of this coil electrically is shorted to described precalculated position from this neutral end.
Like this, the present invention can provide a plurality of different output voltages at output as required.In addition, when monitoring a fault state, provide a reliable state, wherein,, the effect of this coil is removed from circuit in the mode of safety by all circle open circuits of this coil are thrown off and prevented to coil from neutral end.Thereby, avoid usually damage to the coil and the circuit of system.
Best, step (c) comprises that ending the terminal jockey electrically throws off from neutral end with the described other end described coil, and starts a switching device to be connected electrically on this neutral end so that remove the predetermined number of turn of described coil from the described other end of coil.
So only short circuit is near the coil turn of the coil other end, this end of coil is connected on the neutral end.So just realized near the neutral end end, can make the performance of jockey and switching device shifter better thus, because the electric current that runs into is less.
For convenience's sake, step (e) comprises ends described terminal jockey and described switching device shifter and starts another switching device shifter, so that the described other end that makes described coil is to the electrically short circuit of described precalculated position.
Like this, this coil can be thrown off from neutral end with safety and effective and efficient manner, prevents all circle open circuits of this coil simultaneously.
In a most preferred embodiment, this method also comprises the steps: to monitor the load needs of increase and stops step (c) according to the predetermined load needs.
As a result, although during stable status, can supply with (reduction) voltage of a best, when an extra load request occurring, also can supply with quite high voltage.
In another embodiment, this method also comprises the steps: to monitor to the voltage of the described end of coil and when this voltage drops to a predetermined value and stops step (c) when following.
As a result, although during stable status, can supply with (reduction) voltage of a best, when descending, this input voltage also can supply with a quite high voltage to compensate.
For convenience's sake, this method also comprise the steps: after requiring to power a predetermined time interval in the past after, the described request of another being selected voltage is provided.
Like this, can provide another voltage with simple, convenient and cost effective and efficient manner.
According to another aspect of the present invention, provide a kind of electric control system, this system offers a load to of a plurality of selection voltages, and this electric control system comprises:
A positive terminal and a neutral end are used to be connected to a power supply;
An output is used for supplying with the voltage of a plurality of selections;
A coil has an end that electrically is connected to positive terminal, and in the precalculated position tap so that supply with the voltage of a selection of output;
A terminal jockey can be activated and electrically is connected to the other end of coil on the neutral end;
A switching device shifter can be removed the predetermined number of turn of described coil according to selecting the request of voltage to start to another;
Monitoring arrangement is used for monitoring the fault state of at least a type; And
Another switching device shifter starts when monitoring a fault state, and the described other end that can make coil is to the electrically short circuit of described precalculated position.
Like this, can provide different output voltages at output as required, and when monitoring a fault state, realize reliable state, wherein remove the effect of this coil, thereby avoid the coil and the circuit of the system that damages in the mode of safety.
Best, described switching device shifter is connected to neutral end, to remove the predetermined number of turn of described coil from the described other end of coil.
In one case, according to the supervision of fault state, described monitoring arrangement is ended described terminal jockey and described switching device shifter, so that the described other end of coil electrically throws off from neutral end, and starts described another switching device shifter.
In a most preferred embodiment, described monitoring arrangement also comprises an electric current demand checkout gear, and the transient current that is used for detecting in the load current demand changes; Wherein, when the transient changing of electric current was higher than a predetermined level, described monitoring arrangement was ended described switching device shifter.
In another most preferred embodiment, described monitoring arrangement also comprises a current overload monitoring arrangement, is used for monitoring the electric current of coil; Wherein, described monitoring arrangement is ended described terminal jockey and described switching device shifter so that the described other end of coil is electrically thrown off from neutral end, and when the electric current that monitors is higher than predetermined maximum level, starts described another switching device shifter.
In another most preferred embodiment, described monitoring arrangement also comprises a monitoring voltage device, is used for monitoring the voltage of a described end of coil; And wherein, when voltage was lower than predetermined minimum value, described monitoring arrangement was ended described switching device shifter.
For convenience's sake, described monitoring arrangement also comprises timer device, is used to measure from supplying with a described time of selecting voltage to begin; Wherein, when described Measuring Time surpassed predetermined time interval, described monitoring arrangement started described switching device shifter.
In one case, described time set monitors from supplying with another time that described selection voltage begins; Wherein, have only when described another time surpasses an other predetermined time interval, described monitoring arrangement just starts described switching device shifter, during this time interval, does not also drop to below the described predetermined minimum value to the voltage of the described end of described coil.
By having two time intervals of arranging by this way, before obtaining stable status, need not carry out variation unnecessary in the system.
Best, as long as when the termination switching device shifter or when starting described another switching device shifter, time set just resets.
For convenience's sake, terminal jockey, switching device shifter and another switching device shifter comprise relay contact.
Best, this system also comprises a zero-crossing detector, thereby makes the motion of relay contact can occur in zero crossing.
Referring now to accompanying drawing example of the present invention is described, in the accompanying drawings:
Fig. 1 shows that implementing first electric control system of the present invention for one is starting;
Fig. 2 shows that the system of Fig. 1 is after startup;
The system that Fig. 3 shows Fig. 1 after switching to export the voltage of a reduction;
Fig. 4 illustrates the operating branch road of the control of system shown in Figure 1;
Fig. 5 shows that implementing second electric control system of the present invention for one is starting.
With reference to Fig. 1, a positive pole (positive rail) 1 has a positive terminal L who is connected in power supply (not having expression), and a neutral pole 2 has a neutral terminal N who is connected in power supply.Transformer coil 3 has one and is connected in the neutral end 14 that anodal 1 anode 13 and not only be connected in a terminal line 4 but also be connected in a terminal 15.Terminal line 4 can be connected electrically on the terminal 5 by means of a relay contact 200A, and terminal 5 is connected on the utmost point 2, and terminal 15 can be connected electrically on the terminal 7 by means of a relay contact 300A.Point 16 places in transformer coil are connected with a terminal 17.Terminal 17 can be connected electrically on the terminal 5 by means of a relay contact 100A.Relay contact 100A, 200A and 300A are normally opened contacts.This represents in Fig. 1.Have only when its separately coil 100,200 and 300 (describing hereinafter) when electric, just be electrically connected.
Transformer coil 3 connects being connected to predetermined point 18 punishment on the output T.In the present embodiment, transformer coil 3 has 126 circles between point 16 and neutral end 14, between point 16 and tapping point 18 126 circles is arranged, and between tapping point 18 and anode 13 14 circles is arranged.Therefore, obviously pass through the proper handling of relay contact 100A and 200A, neutral end 14 can take place through the connection of terminal 5 to neutral pole 2, perhaps put 16 through the connection of terminal 17 to neutral pole 2, thereby can make of voltage of the reduction of two selections appear at terminal T place.
A branch road of a monitoring arrangement control circuit is connected between the utmost point 1 and 2.This branch road comprises a fuse 10, and an end of fuse 10 is connected on the utmost point 1, and the other end is connected on the end points of a normally opened relay contact 600A.Relay contact 600A can be electrically connected with an end points, and this end points is connected to a side of heat sensor 12.The opposite side of heat sensor 12 not only is connected on the coil 800 but also be connected on the end points of a normally closed relay contact 300B.Relay contact 300B can be electrically connected with an end points, and this end points is connected on the end points of a relay contact 500A who lives with circle, and this frame generally indicates with label 51.Relay contact 500A or be electrically connected with an end points that is connected on the coil 100, perhaps not only be electrically connected with a lamp Am (Amber) but also with an end points that is connected on the coil 200, coil 100, lamp Am and coil 200 all are connected on the utmost point 2.
Another branch road of monitoring arrangement control circuit also is connected between the utmost point 1 and 2.This branch road comprises a fuse 20, and an end of fuse 20 is connected on the utmost point 1, and the other end is connected to the end points of a normally closed relay contact 100B.Relay contact 100B can be electrically connected with an end points, and this end points is connected on end points of another relay contact 200B.Relay contact 200B can carry out electric the contact with an end points, and this end points is connected on the fault state unit.
This fault state unit comprises a DC power supply, and this power supply provides 12 volts of power transmission lines to the end of a normally opened relay contact 800B.Relay contact 800B can be electrically connected with a coil 900, and coil 900 is connected on the utmost point 2.12 volts of power transmission lines of another root are connected to the end of normally opened relay contact 700A.Relay contact 700A can be electrically connected with coil 300, and coil 300 is connected on the utmost point 2.12 volts of power transmission lines of another root are connected to the end of a normally closed relay contact 800A and the end of a normally opened relay contact 900A.Relay contact 800A and 900A can be electrically connected with an end of a manual reset switch 20.The other end of manual reset switch 20 is connected on the coil 700, and coil 700 is connected on the utmost point 2.
The current sensor 21 of an annular is wrapped on the utmost point 1.The output of transducer 21 is connected on one first branch road, and this branch road generally also is illustrated among Fig. 4 in detail with label 52 marks.As seen, the output of transducer 21 is connected on the switching network 24.This network switch is from the current signal of transducer 21 and an output that comprises the voltage that is directly proportional with the electric current that flows through along the utmost point 1 is provided.Come the voltage output of automatic network 24 to be connected on 22 and level sensors 23 of a step transducer (stepsensor).
Step transducer 22 detects the level rising of the input value of automatic network 24 with respect to former input value.Like this, can detect the load that is connected to terminal T and when change, thereby may need a voltage that increases, for example, under the situation of fluorescent illumination, the variation of load means the connection of illumination.
The caused incorrect detection of transient process for fear of the switching by sensing element causes on the line can comprise a zero circuit, and this circuit such as between the transfer period of relay contact 500A, stops to detect a bit of time effectively between transfer period.
When step transducer 22 detects the increase of electric current, just a signal is delivered to the short timer 25 that is reset and starts.The output of short timer 25 delivered to the gate logic 26 that is used for controlling a switch 27 to start or to end coil 500.
Level sensor 23 detects an initial current level, and is used for controlling signal of door 28 outputs of a switch 29 to start or termination coil 600 to one.Surpass under the situation of predetermined maximum at current level, level sensor 23 is to signal of gate logic 26 outputs.
A voltage sensor 30 is by being positioned at the voltage in the last brush detection anodal 1 of relay contact 600A.When this voltage is lower than a certain level, a signal is delivered to gate logic 26, also deliver to a long timer 31 that is reset and starts.Gate logic 26 is delivered in the output of this long timer.
Press following operation with reference to the electric control system that Fig. 1 describes.Fig. 1 shows that electric power begins to supply with the initial position of terminal L and N.Behind initial 4 to 8 milliseconds, initial current flows and takes place along the utmost point 1, and some circle by transformer coil 3 is to output T, because relay contact 100A, 200A and 300A be in its normally open position, but do not provide any tangible impedance for these circles of time of such weak point.In addition, lamp Rd is lighted by fuse 10, and this not only represents the existence of supply voltage, and expression fuse 10 does not also blow.Current sensor 21 detects this of electric current and flows.As a result, level sensor 23 along the line 40 is to signal of door 28 outputs.The logical circuit of door 28 provides a signal to switch 29, thereby electric current supply coil 600, so that make this coil get electric and so closing relay contact 600A.
As a result, form a circuit by fuse 10 and closed now relay contact 600A.Thereby the heat sensor 12 of the cooling situation of electric current can flow through magnetic test coil 3 and start the time, flow through normally closed relay contact 300B and flow through the relay contact 500A that is connected electrically to coil 200.Electric current also flows through heat sensor to coil 800.In addition, light lamp Am.
Because coil 200 is charged now, so relay contact 200A is closed terminal 4 and 5 is electrically linked together, thereby the neutral end 14 of transformer coil 3 is connected on the utmost point 2.Thereby electric current flows through all circles of coil 3.Thereby the voltage that occurs at terminal T is 252/266 of terminal L voltage.The supply of this voltage is indicated by the shinny of lamp Am.
Because coil 800 is charged now, thus relay contact 800B closure, and relay contact 800A opens.Yet electric current can not flow through fuse 20 for a long time, because along with coil 200 must be electric, relay contact 200B will open.Should be appreciated that, coil 700 and 900 be designed to electric operation response very slow (such as 100 milliseconds), thereby its instead would not occurring in before relay contact 200B opens of relay separately.Thereby, do not exist coil 300 may get electric danger with closing relay contact 300A.Above-mentioned situation is shown in Fig. 2.
As mentioned above, current sensor 21 detects the initial flow of electric current by the utmost point 1.As a result, step transducer 22 detects current step, and to signal of short timer 25 outputs, and along the line 41 to signal of gate logic 26 outputs.By means of gate logic 26, existence on the signal online 41 is ended switch 27 and is made the coil 500 must not electricity, and coil 500 remains on its initial position.Yet, in case the step transducer has detected one period scheduled time of initial flow of electric current, and do not detect other step, so the signal on online 41 just disappears.
When current sensor 21 detected initial current, voltage sensor 30 detected a voltage that is higher than predetermined minimum levels, and to signal of long timer 31 outputs, and along the line 42 export a signal to gate logic 26.
In case the timing of short timer 25 finishes, and just a signal along the line 43 is exported to gate logic 26.Yet, finishing and signal of 44 outputs along the line up to long timer 31 also timing, switch 27 can not make coil 500 get.Like this, during the cycle of spread of voltage, coil 500 can be suitably.However, in case voltage becomes stable and like this maintenance, short timer 25 gets with regard to control coil 500.
In a word, if have on online 41 in the signal indication electric current needs step arranged, if there is not signal one this expression voltage not enough on perhaps online 42, if perhaps lack timer 25 and long timer 31 all timing finish and on its line 43 and 44 separately, output signal arranged, then gate logic 26 will can not worked and be connected switch 27.
When satisfying the standard of gate logic, the connection of switch 27 then takes place, thereby make electric current flow through coil 500.As a result, relay contact 500A motion is connected to relay terminal on the coil 100 with electric connection.Thereby electric current is the coil 200 by becoming dead electricity no longer, and coil 100 gets now.As a result, relay contact 100A closure, and relay contact 200A opens.Thereby, eliminated at each circle of putting the coil 3 between 16 and 14.Therefore, 126/140 a voltage for the voltage at terminal L place appears at terminal T place.Should be appreciated that preferably relay contact 100A is closed before relay contact 200A opens.This situation is illustrated among Fig. 3.
Except the motion of above-mentioned relay contact, relay contact 100A opens although be also to be understood that the present closure of relay contact 200B, but still keeps not having electric current to flow through and comprise the circuit of these relay contacts.
The circuit of this embodiment comprises fault monitoring, so that a plurality of security features are provided.
Say exactly, lost efficacy at the relay contact operating coil, system generally transships, system's external fault produces that fault in overload conditions, the coil causes that temperature raises and operation heat sensor 12, fault make that fuse 10 blows, a line conductor disconnect relay contact 100A or 200A are thrown off and the situation of any inefficacy that makes open coil under, present embodiment can provide a reliable state.
The situation of this reliable state is described below with reference to several examples.Be lower than predetermined level as long as flow through the electric current of the utmost point 1, coil 600 just keeps electricly and relay contact 600A closure.Yet, when level sensor 23 detects electric current and is higher than maximum permissible current, switch 29 is disconnected, thereby makes coil 600 no longer with regard to along the line 45 logical circuits to door signal of 28 outputs and door 28.As a result, relay contact 600A opens and makes coil 100,200 and 800 dead electricity.Therefore, relay contact 100A and 200A open, and relay contact 100B, 200B and 800A closure.
Back three relay contact closures provide by manual reset switch 20 electric current that coil 700 must be electric are flowed.Thereby after about 100 milliseconds, coil 700 makes relay contact 700A closure, and provides the electric current of coils 300 to flow.As a result, relay contact 300A closure makes to stride across a little basic circle short circuit of the coil between 18 and 14 3 with connecting terminal 15 and 7 whereby.Therefore, magnetic field disappears, thereby coil 3 stops not provide impedance basically as a transformer job and between point 13 and 18.
Because full input voltage appears at terminal T now, closed relay contact 300A has the effect of bypass electric power system of the present invention.In addition, avoided otherwise because open circuit and the situation of coil 3 may occur damaging, thereby reliable state can be provided.At this on the one hand, should consider to stay a kind of like this situation of open circuit.If the long arbitrarily time takes place in open circuit, between point 13 and 16, will there be a voltage drop, be 24 volts in this example, thereby electric power system of the present invention and so does not provide real reliable state not by bypass.And, reverse the electric meeting of coil cause humming the annoying of sound or buzz form and disturb people's vibration.In addition, coil reaches the saturation voltage that strides across the open coil part the most at last.This saturation voltage can reach very high value, is 760 volts magnitude in this example, and this is serious potential hazard for any personnel that may contact system once in a while not only, and because insulation damages can also produce spark, coil insulation is lost efficacy.
Should be noted that coil 300 the electric relay contact 300B that opens, thereby end coil 100 and 200 and the electric operation of relay contact separately.If the electric current that flows through along the utmost point 1 descends once more, then along the line 45 blackout and door 28 are connected switch 29 again, thereby make coil 600 once more.This causes the closure of relay contact 600A, and consequently relay contact 300A opens, and according to the output from gate 26, perhaps relay contact 100A or 200A closure.Best, the branch road shown in Fig. 4 arranges like this, when electric current relay contact 200A closure when the utmost point 1 flows once more.This can realize by guaranteeing that long timer 31 resets, such as the voltage detecting by interrupt voltage transducer 30.At this on the one hand, should be noted that how tube current does not flow, be lower than predetermined level as long as the voltage on the utmost point 1 drops to, then long timer 31 just resets, thereby relay contact 500A returns the position of connecting coil 200 automatically.
When electric power system of the present invention in use, if heat sensor 12 owing to cross thermal cutoff, then electric current no longer flows to coil 100,200 and 800, consequently relay contact 100A, 200A and 800A open.Relay contact 300A closure, its result is with above-mentioned identical.
When heat sensor 12 detects a suitable temperature and when closed, electric current can flow to coil 800 once more once more.As a result, relay contact 800A opens, and is disconnected to the current path of coil 700.This causes its relay contact 700A to open, thereby electric current no longer flows to coil 300.This result is its relay contact 300B closure, provides electric current once more and makes coil 100 or 200.Should be appreciated that although relay contact 800B closure, coil 900 actions are slower, thereby relay contact 900A can not move in time so that an other current path to be provided to coil 700.Thereby system is reset.
Another kind of fault monitoring be that relay contact 100A or 200A are relevant with opening owing to machinery or electrical failure.Although contact 800B is because electric current flows through coil 800 and closure, coil 900 is not charged, because relay contact 100A or 200B open.Yet for machinery or electric fault, this relay contact of opening can be closed, thereby now electric current supply coil 900.After about 100 milliseconds, relay contact 900A is with closure, thereby electric current is supplied with coils 700 through manual switch 20, and hand switch 20 finally makes relay contact 300A by above-mentioned action.Should be noted that this with regard to the pinning system, thereby need check system particularly.Yet, still to the electric that is connected to terminal T.
Similarly, if relay contact 800A or coil 800 lost efficacy, still can obtain similarly reliable state.
Should be appreciated that, not only by electric approach but also by mechanical interlocked each contact, prevent in relay contact 100A or 200A action, relay contact 300A action, thereby make relay contact 300A between relay contact 100A and 200A, so that their any one action has prevented the action of relay contact 300A, and the action of relay contact 300A has also prevented the action of relay contact 100A and 200A.
Should also be appreciated that, in case realize reliable state, normal operating condition just can be got back to by the action of reset switch 20 by system, the electric current supply that reset switch 20 cuts off coil 700, coil 700 will cut off the electric current supply to coil 300 then, thereby relay contact 300A is opened and make the closure of relay contact 100A or 300A.
Fig. 5 shows the second embodiment of the present invention, wherein has identical label with the first embodiment components identical.
With reference to Fig. 5, can understand and revise the branch road that comprises fuse 20.Specifically, changed the fault state unit.Relay contact 200B is connected on the end and coil 1000 of a normally opened relay contact 1000A now, and coil 1000 is connected on the utmost point 2.Relay contact 1000A can be to the terminal of relay contact 800B, to the terminal of normally opened relay contact 700A, be electrically connected to terminal of normally closed relay contact 800A and to the terminal of normally opened relay contact 900A.Remaining connection is identical with Fig. 1.
Except above-mentioned, a green light Gr cross-over connection coil 100, and a blue lamp cross-over connection coil 300.Thereby the user knows that system is connected in the circuit, exists voltage and fuse 10 also not to blow on the utmost point 1 and 2 when lamp Rd is shinny; When lamp Am is shinny, know that then the voltage that produces from relay contact 200A just is being provided at output T; And when lamp Gr is shinny, know that then the voltage that produces from relay contact 100A just is being provided at output T; And when lamp B1 is shinny, then know the situation that broken down.
Obviously, just cheat when starting at the embodiment of Fig. 5, electric current flows through relay contact 100B and 200B to coil 1000.Yet coil 1000 actions are very slow, thereby relay contact 100B or 200B can open before the closure at relay contact 1000A.Therefore, the various functions of fault state unit not electric current supply they.
Under the environment of fault state, the result is not only closing relay contact 100B but also closed 200B, thereby electric current supply coil 1000.After fixing time-delay, relay contact 1000A closure is with electric current supply fault state unit, thereby by above-mentioned such this unit of operating.
Should be appreciated that said embodiment has shown application of the present invention with a kind of form, this just for illustrative purposes.In practice, the present invention can be used for different configurations, and for those skilled in the art, it is simple and clear using detailed embodiment.
For example, work like this although connect described embodiment, when relay contact 100A connected, relay contact 200A disconnected; But when relay contact 100A connected, relay contact 200A also can still connect.
In addition, in that two relay contact 100A and 200A are provided can terminal T place supply with two select voltages in, can provide other relay contact so that selection voltage more than two can be provided.
Although described embodiment uses 50 weeks, 240 volts power supply, also can use other line voltage and frequency, for example, 110 volts or 277 volts of 60 weeks.
Utilization automatically resets and to the frequent detection of fault, makes described embodiment full automation.Yet, although the invention describes under the situation below, when switching is connected to load on the terminal T and during the emergent power demand, when low input occurring, when any fault appears in the branch road among Fig. 4 and when any fault produces the current fluctuation that surpasses predetermined level, will switch to relay contact 200A from relay contact 100A; But also can make less reaction to these situations and save cost by containing.For example, in the better simply form of the present invention, such as replacing weak point and long timer to come transfer relay contact 500A with simple time-delay relay.Similarly, can save voltage sensor shown in Fig. 4 and step transducer.
In addition, be expressed as can be by a relay contact of a coil manipulation for the relay contact 500A in frame 51.Should be appreciated that the operation control of the relay contact in frame 51 can be adopted multiple formula.For example, can depend on the timer group, as shown in FIG. 4, perhaps can depend on a time-delay relay.The latter is particularly suitable for controlling the load that only has one or two unit, as the illumination of the street.
Although may adopt mechanically operated relay contact, obviously the switch of electric operation also can be used as alternative.Yet, should be noted that, be positioned at the neutral end place of coil 3 by making relay contact 100A and 200A, obtain much smaller switch current than configuration with prior art.Really, the application of the invention can also reduce the rated power of desired relay contact greatly.For example, can control a 20KVA system, and not have usually and cut the relevant performance depreciation of very big inductive load with the relay contact of rated power 2KVA.Thereby, guaranteed extreme high reliability.
Although current sensor 21 is positioned on the utmost point 1, should be appreciated that this current sensor also can be positioned at and be connected to extremely going up on the terminal T.
Thereby, present embodiment provides a kind of system that can export a voltage, this voltage can switch near between the level of supply voltage (or select voltage) and the level that is reducing fully during in the connection load at one, can also switch to the magnitude of voltage of a reduction, the magnitude of voltage of this reduction can obviously not reduce the effect of load, brightness such as illumination, but can significantly improve economy, simultaneously under out of order state, safe and reliable reliable state always can be provided, improve the fail safe of system thus and the system that guarantees meets various laws and regulations requirements.
Obviously, although the present invention who has described is relevant with fluorescent illumination, obviously the present invention also can be used for other illuminators and other loads usually.
Claims (17)
1. method of controlling electric power system, this system offers a load to of a plurality of selection voltages, and this method comprises the steps:
(a) end of a coil is connected electrically to the anode of a power supply, this coil in the precalculated position tap so that the voltage of a selection of output to be provided;
(b), make a terminal jockey be connected electrically to the other end of described coil a neutral end of described power supply according to power reguirements;
(c) select the requirement of voltage according to another, the predetermined number of turn of removing described coil;
(d) fault state of at least a type of supervision; And
(e) when monitoring a fault state, this coil is electrically thrown off and the described other end of this coil electrically is shorted to described precalculated position from this neutral end.
2. method according to claim 1, wherein step (c) comprises that ending the terminal jockey electrically throws off from neutral end with the described other end described coil, and starts a switching device to be connected electrically on this neutral end so that remove the predetermined number of turn of described coil from the described other end of coil.
3. method according to claim 2, wherein step (e) comprises and ends described terminal jockey and described switching device shifter and start another switching device shifter, so that the described other end that makes described coil is to the electrically short circuit of described precalculated position.
4. require each described method according to aforesaid right, also comprise the steps: to monitor the load needs of increase and stop step (c) according to the predetermined load needs.
5. require each described method according to aforesaid right, also comprise the steps: to monitor voltage, and stop step (c) when following when this voltage drops to a predetermined value to a described end of coil.
6. require each described method according to aforesaid right, also comprise the steps: after requiring to power a predetermined time interval in the past after, the described request of another being selected voltage is provided.
7. electric control system, this system offers a load to of a plurality of selection voltages, and this electric control system comprises:
A positive terminal and a neutral end are used to be connected to a power supply;
An output is used for supplying with the voltage of a plurality of selections;
A coil has an end that electrically is connected to positive terminal, and in the precalculated position tap so that supply with the voltage of a selection of output;
A terminal jockey can be activated and electrically is connected to the other end of coil on the neutral end;
A switching device shifter can be removed the predetermined number of turn of described coil according to selecting the request of voltage to start to another;
Monitoring arrangement is used for monitoring the fault state of at least a type; And
Another switching device shifter starts when monitoring a fault state, and the described other end that can make coil is to the electrically short circuit of described precalculated position.
8. system according to claim 7 wherein, is connected to neutral end to described switching device shifter, to remove the predetermined number of turn of described coil from the described other end of coil.
9. system according to claim 8, wherein, according to the supervision of fault state, described monitoring arrangement is ended described terminal jockey and described switching device shifter, so that the described other end of coil electrically throws off from neutral end, and start described another switching device shifter.
10. according to each described system of claim 7 to 9, wherein, described monitoring arrangement also comprises: an electric current demand checkout gear, and the transient current that is used for detecting in the load current demand changes; Wherein, when the transient changing of electric current was higher than a predetermined level, described monitoring arrangement was ended described switching device shifter.
11. according to each described system of claim 7 to 9, wherein, described monitoring arrangement also comprises a current overload monitoring arrangement, is used for monitoring the electric current of coil; Wherein, described monitoring arrangement is ended described terminal jockey and described switching device shifter so that the described other end of coil is electrically thrown off from neutral end, and when the electric current that monitors is higher than predetermined maximum level, starts described another switching device shifter.
12. according to each described system of claim 7 to 9, wherein, described monitoring arrangement also comprises a monitoring voltage device, is used for monitoring the voltage of a described end of coil; And wherein, when voltage was lower than predetermined minimum value, described monitoring arrangement was ended described switching device shifter.
13. according to each described system of claim 7 to 9, wherein, described monitoring arrangement also comprises timer device, is used to measure from supplying with a described time of selecting voltage to begin; Wherein, when described Measuring Time surpasses predetermined time interval, described monitoring arrangement starts described switching device shifter, this system also comprises gate logic, be connected with time set and be used to receive its output signal, adjust the voltage that is applied to load thus to produce the control signal that starts described switching device shifter.
14. system according to claim 13, wherein, described monitoring arrangement also comprises another time set, monitors from supplying with another time that described selection voltage begins; Wherein, have only when described another time surpasses an other predetermined time interval, described monitoring arrangement just starts described switching device shifter, during this time interval, does not also drop to below the described predetermined minimum value to the voltage of the described end of described coil.
15. system according to claim 13, wherein, described system also comprises and is used to detect the described switching device shifter of termination and described another switching device shifter of startup and is used to produce the device of an output of indicating it, and be used to respond any situation and occur, utilize the reset device of described time set of this output.
16. according to each described system of claim 7 to 9, wherein, terminal jockey, switching device shifter and another switching device shifter all comprise relay contact.
17. system according to claim 16 also comprises a zero-crossing detector, thereby makes the motion of relay contact can occur in optimum in cycle period.
Applications Claiming Priority (4)
| 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 |
| GB9414665.1 | 1994-07-20 | ||
| GB9504282.6 | 1995-03-03 | ||
| GBGB9504282.6A GB9504282D0 (en) | 1994-07-20 | 1995-03-03 | Improvements in and relating to control systems for electrical circuits |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1155967A CN1155967A (en) | 1997-07-30 |
| CN1087585C true CN1087585C (en) | 2002-07-10 |
Family
ID=26305306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95194706A Expired - Fee Related CN1087585C (en) | 1994-07-20 | 1995-07-20 | Electrical power control system |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP0771518B1 (en) |
| JP (1) | JP3746295B2 (en) |
| CN (1) | CN1087585C (en) |
| AT (1) | ATE176118T1 (en) |
| AU (1) | AU700796B2 (en) |
| BR (1) | BR9508791A (en) |
| CA (1) | CA2226498C (en) |
| DE (1) | DE69507484T2 (en) |
| ES (1) | ES2129838T3 (en) |
| GB (1) | GB2307119B (en) |
| HK (1) | HK1011517A1 (en) |
| NZ (1) | NZ289906A (en) |
| WO (1) | WO1996003018A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424646A (en) * | 2012-05-17 | 2013-12-04 | 通用汽车环球科技运作有限责任公司 | Vehicle electrical system fault detection |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3070225B1 (en) * | 2017-08-16 | 2019-09-20 | Aksor | AUTOMATIC TERMINAL |
| EP3975362A1 (en) * | 2020-09-24 | 2022-03-30 | Volvo Truck Corporation | Safety circuit for a power system of a vehicle and method for controlling the safety circuit |
Citations (4)
| 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 |
-
1995
- 1995-07-20 AU AU29884/95A patent/AU700796B2/en not_active Ceased
- 1995-07-20 BR BR9508791A patent/BR9508791A/en not_active IP Right Cessation
- 1995-07-20 CN CN95194706A patent/CN1087585C/en not_active Expired - Fee Related
- 1995-07-20 AT AT95925944T patent/ATE176118T1/en not_active IP Right Cessation
- 1995-07-20 JP JP50484196A patent/JP3746295B2/en not_active Expired - Fee Related
- 1995-07-20 CA CA002226498A patent/CA2226498C/en not_active Expired - Fee Related
- 1995-07-20 NZ NZ289906A patent/NZ289906A/en unknown
- 1995-07-20 ES ES95925944T patent/ES2129838T3/en not_active Expired - Lifetime
- 1995-07-20 EP EP95925944A patent/EP0771518B1/en not_active Expired - Lifetime
- 1995-07-20 GB GB9703695A patent/GB2307119B/en not_active Revoked
- 1995-07-20 WO PCT/GB1995/001729 patent/WO1996003018A1/en active IP Right Grant
- 1995-07-20 DE DE69507484T patent/DE69507484T2/en not_active Expired - Fee Related
-
1998
- 1998-11-14 HK HK98112015A patent/HK1011517A1/en not_active IP Right Cessation
Patent Citations (4)
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424646A (en) * | 2012-05-17 | 2013-12-04 | 通用汽车环球科技运作有限责任公司 | Vehicle electrical system fault detection |
| US9081039B2 (en) | 2012-05-17 | 2015-07-14 | GM Global Technology Operations LLC | Vehicle electrical system fault detection |
| CN103424646B (en) * | 2012-05-17 | 2016-12-28 | 通用汽车环球科技运作有限责任公司 | Vehicle electrical systems fault detect |
Also Published As
| Publication number | Publication date |
|---|---|
| MX9700481A (en) | 1998-10-31 |
| BR9508791A (en) | 1997-12-30 |
| CN1155967A (en) | 1997-07-30 |
| EP0771518B1 (en) | 1999-01-20 |
| EP0771518A1 (en) | 1997-05-07 |
| WO1996003018A1 (en) | 1996-02-01 |
| ES2129838T3 (en) | 1999-06-16 |
| GB2307119B (en) | 1998-05-27 |
| ATE176118T1 (en) | 1999-02-15 |
| CA2226498C (en) | 2003-02-18 |
| NZ289906A (en) | 1998-10-28 |
| JP3746295B2 (en) | 2006-02-15 |
| GB9703695D0 (en) | 1997-04-09 |
| GB2307119A (en) | 1997-05-14 |
| JPH10504122A (en) | 1998-04-14 |
| DE69507484T2 (en) | 1999-09-02 |
| CA2226498A1 (en) | 1996-02-01 |
| DE69507484D1 (en) | 1999-03-04 |
| AU700796B2 (en) | 1999-01-14 |
| HK1011517A1 (en) | 1999-07-09 |
| AU2988495A (en) | 1996-02-16 |
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