CN100373744C - Unit resident normal/ emergency power supply switch board and its power supply automatic converting device - Google Patents
Unit resident normal/ emergency power supply switch board and its power supply automatic converting device Download PDFInfo
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- CN100373744C CN100373744C CNB2004100287489A CN200410028748A CN100373744C CN 100373744 C CN100373744 C CN 100373744C CN B2004100287489 A CNB2004100287489 A CN B2004100287489A CN 200410028748 A CN200410028748 A CN 200410028748A CN 100373744 C CN100373744 C CN 100373744C
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Abstract
A home power cabinet panel is provided to supply a supply voltage in a normal status and an emergency power in an abnormal status by including a power switching unit in the home power cabinet panel. A home power cabinet panel comprises a main circuit breaker(102) for cutting off a supply voltage when generating an over-current or a leakage current by detecting the status of the supply voltage; a plurality of sub circuit breakers(204,206,208) connected to an output terminal of the main circuit breaker with an electric wire and which is branched from the electric wire for supplying the supply voltage to a general electric load and cuts off the power when generating an over-current or a leakage current at the electric load; and an auto power switching unit(220) for supplying an emergency power through an emergency wire when not receiving the supply voltage and supplying the supply voltage through the emergency wire when receiving again the supply voltage by cutting the emergency power.
Description
Technical field
The present invention relates to a kind of unit resident normal/emergency power supply switch board and resident family of unit thereof uses always/the emergency power supply loop, particularly relate to family expenses automatic equipment, gas alarm valve, emergency light, electronic type fire extinguisher, cooling-heating room with visual plants such as equipment, at normal condition supply power supply commonly used and at emergent unit resident normal/emergency power supply switch board and the automatic transfer equipment thereof of supplying with emergency power supply period.
Background technology
The distribution board of resident family of general unit is to be provided with by resident family of unit in the building of apartment, villa, independent dwelling house, public building, office building etc., and play reallocating to each electric loading from the power supply commonly used of outside supply, prevent to leak electricity or when excess load, cut off the electricity supply with generation or the impaired effect of electric loading that prevents fire.
This distribution board is made of with the circuit breaker that each electric loading is connected respectively with the power supply that handle has passed through above-mentioned main circuit breaker the main circuit breaker that is connected the primary input terminal in order to supply with each electric loading by primary input terminal handle from the power supply commonly used of outside input.
Nowadays at buildings such as apartment or office buildings, when power supply commonly used is cut off, supply with emergency power supply, light emergency light, play illuminating effect to each resident family.Especially when the office building power supply is cut off, require to supply with emergency power supply to light emergency light.
Here, power supply commonly used is meant from power transmission sequence and is input to the power supply of supplying with each resident family in the building.Emergency power supply is meant power supply commonly used because of the power supply that has a power failure or power transmission sequence opens circuit and supplies with when being cut off, and supplies with oneself generating or accumulator equipment or emergent storage power equipment usually.
Fig. 1 is resident family of existing unit feeder distribution centre and emergency power supply distribution structure figure.
Power supply commonly used is to be supplied with by feeder distribution centre 10, and emergency power supply is generated electricity by oneself generating or accumulator equipment or emergent storage power equipment, and it carries out distribution by other in the electric wire of power supply commonly used, only powers when power supply commonly used is cut off.
Above-mentioned main circuit breaker 12 or a plurality of auxilliary circuit breaker 14,16,18 adopt the ELCB that detects excess load, the MCCB that cuts off the electricity supply or detect the electric leakage state, cut off the electricity supply.A plurality of auxilliary circuit breakers 14,16,18 adopted ELCB when above-mentioned main circuit breaker 12 was MCCB; A plurality of auxilliary circuit breakers 14,16,18 adopted MCCB or ELCB or use MCCB with and ELCB when above-mentioned main circuit breaker 12 was ELCB.Above-mentioned a plurality of auxilliary circuit breaker 14,16,18 links to each other with a plurality of electric heating appliances etc. with electric light respectively.The various lamps in the parlor in for example auxilliary circuit breaker 14 and the resident family of unit are connected with setting socket on the wall; Auxilliary circuit breaker 16 is connected with the socket that is provided with on the wall with the various lamps in inner room; Auxilliary circuit breaker 18 is connected with the socket that is provided with on the wall with the various lamps of cabin and balcony.For example by the socket that is connected with auxilliary circuit breaker 18 to family expenses automatic equipment, cooling-heating room during with supply powers such as equipment, electronic type fire extinguisher, gas alarm valves, from then on socket is supplied with power supply commonly used and is made it work.The family expenses automatic equipment comprise various door lock assemblies based on the door lock assembly of fingerprint or infrared ray identification, utilize password door lock assembly, based on the door lock assembly of card etc. and video phone, telephone set, coal gas, antitheft, take precautions against natural calamities, utilize remote control to make the machine of household electrical appliances work.
Emergency power supply is in addition in power supply commonly used, by vertical stringing, is connected in parallel with each resident family of apartment house, to the emergency light supply power that is arranged on each resident family it lighted when power supply commonly used is cut off.
The power supply commonly used of above-mentioned resident family of unit and emergency power supply wiring have the structure of power supply commonly used arranged apart and emergency power supply, when the interruption of supplying with because of power supply at power supply commonly used or the cut-out of power transmission sequence have a power failure, except emergency light 20, can't use emergency power supply.
And in order when having a power failure, to supply with emergency power supply, vertical stringing between the levels of resident family of unit, the therefore interlayer noise that transmits by stringing, the problems such as life inconvenience that can cause influencing individual's life or cause because of noise.
Under the situation of using the family expenses automatic equipment, prepare backup battery so that when having a power failure, also can work, but can't use under the situation of backup battery at the backup battery that does not have the family expenses automatic equipment or because of not using for a long time the backup battery battery liquid to leak outside to make, just can't start the family expenses automatic equipment, have the inconvenience that can not pass in and out thus.In addition, when using the family expenses automatic equipment, if long-time the power failure, then limited because of battery life, so can't make the work of family expenses automatic equipment when existing battery life to finish, can't make door lock work when going out and can not enter within doors problem, and can't realize shaking at a distance control at all.
In addition, because of can't can't using the electronic type fire extinguisher to electronic type fire extinguisher supply power, under the situation of the occupant of resident family of unit breaking out of fire when power failure, can't work because of the electronic type fire extinguisher faces the problem that takes a bath when having a power failure.
In addition, when the low cold snap of temperature has a power failure, because of warmer can't start, bursting by freezing takes place or suffer inconvenience such as cold so face.
In addition under the situation of family expenses automatic equipment, because of other will prepare backup battery, the volume of the shell of packing into of family expenses automatic equipment can increase, and is used to be provided with when packing the cement of wall of shell into constructing, be equivalent to the cement of shell size of packing into because of not inserting, so the possibility that crackle takes place is arranged.
Summary of the invention
Therefore the object of the present invention is to provide a kind of using always/emergency power supply distribution board and resident family of unit to use always/the emergency power supply automatic transfer equipment, it is characterized in that resident family of unit makes electronic type fire extinguisher, gas alarm valve, cooling-heating room carry out work with equipment, emergency light etc. with emergency power supply when having a power failure, with the loss that prevents bursting by freezing and cause because of fire.
Another object of the present invention is to provide a kind of unit resident normal/emergency power supply switch board and resident family of unit to use always/the emergency power supply automatic transfer equipment, it is characterized in that resident family of unit can be dual-purpose as primary light and emergency light with a light fixture.
Another purpose of the present invention is to provide a kind of unit resident normal/emergency power supply switch board and resident family of unit to use always/the emergency power supply automatic transfer equipment, it is characterized in that resident family of unit can make family expenses automatic equipment etc. carry out work with emergency power supply when having a power failure, thereby can save this expense of backup battery, can dwindle simultaneously pack into the volume of shell of family expenses automatic equipment, reduce the root that crackle takes place.
Another purpose of the present invention be to provide a kind of unit resident normal/emergency power supply switch board and resident family of unit commonly used/the emergency power supply automatic transfer equipment, it is characterized in that preventing by in order to light the emergency light established in addition between resident family of unit levels the caused noise of vertically disposed comb.
Another purpose of the present invention is to provide resident family of a kind of unit to use always/the emergency power supply automatic transfer equipment, emergency power supply is provided with respectively by resident family when it is characterized in that having a power failure, even therefore in certain resident family power supply short circuit, the emergency power supply that also can not cut off other resident family take place.
Another purpose of the present invention be to provide resident family of a kind of unit commonly used/the emergency power supply automatic transfer equipment, it is characterized in that when having a power failure, supplying with under the situation of emergency power supply, prevent the overburden of emergency power supply or the fire that causes because of overcurrent.
Description of drawings
Fig. 1 is resident family of existing unit feeder distribution centre and emergency power supply Wiring structure figure
Fig. 2 is according to the resident family of unit of embodiment of the invention power supply commonly used/emergency power supply feeder distribution centre structure chart
Fig. 3 is the detailed circuit diagram according to the commonly used/automatic converter section 220 of emergency power supply of the embodiment of the invention
Fig. 4 is often lamp electric power loop and an emergency light electric power loop structure chart of resident family of existing unit
Fig. 5 is according to the resident family of unit of the embodiment of the invention often lamp electric power loop and emergency light electric power loop structure chart
Fig. 6 is in order to start the suitable demonstration graph that common load is provided with the power supply circuit of power supply commonly used/emergency power supply distribution board according to the embodiment of the invention
Among the figure,
100: power input 102 commonly used: main circuit breaker
200: feeder distribution centre 202: the emergency power supply input
204,206,208: a plurality of auxilliary circuit breakers
220: commonly used/the automatic converter section of emergency power supply
300: power supply commonly used is supplied with test section 302: the emergency power supply test section
304: timer 306: mains switch portion
Embodiment
Describe the preferred embodiments of the present invention with reference to the accompanying drawings in detail.In addition, in explanation process of the present invention, think some of relevant item, function or structure specified main points of the present invention and then omit detailed description thereof when unimportant.
Fig. 2 is the structure chart of resident family of unit power supply commonly used/emergency power supply feeder distribution centre according to an embodiment of the invention.
Consist of the following components:
Above-mentioned main circuit breaker 102 or 204,206, the 208 employing detection overloads of a plurality of auxilliary circuit breaker or electric leakage, the MCCB that cuts off the electricity supply or the ELCB that detects the electric leakage state, cuts off the electricity supply.A plurality of auxilliary circuit breakers 204,206,208 adopted ELCB when above-mentioned main circuit breaker 102 was MCCB, and a plurality of auxilliary circuit breakers 204,206,208 adopted MCCB or ELCB or use MCCB with and ELCB when above-mentioned main circuit breaker 102 was ELCB.
Above-mentioned a plurality of auxilliary circuit breaker 204,206,208 is connected with a plurality of electric heating appliances etc. with electric light separately.The various lamps in the parlor in for example auxilliary circuit breaker 204 and the resident family of unit are connected with setting socket on the wall; Auxilliary circuit breaker 206 is connected with the socket that is provided with on the wall with the various lamps in inner room; Auxilliary circuit breaker 208 is connected with the socket that is provided with on the wall with the various lamps of cabin and balcony.
In the above-described configuration, though between power input terminal 100 commonly used and emergency power supply input terminal 202 and commonly used/automatic converter section 220 of emergency power supply, do not express circuit breaker respectively, but also the circuit breaker of being made up of ELCB or MCCB can be set, detect overburden and overcurrent and leakage current etc., and cut off.
Fig. 3 is the detailed circuit diagram according to the commonly used/automatic converter section 220 of emergency power supply of the embodiment of the invention.
Consist of the following components:
The supply of the power supply commonly used that detection is introduced by above-mentioned power input terminal 100 commonly used, and power supply commonly used carried out rectification and filter is flat, supply with test section 300 with the power supply commonly used that DC power supply takes place; The supply of the emergency power supply that detection is introduced by emergency power supply input terminal 202, and emergency power supply carried out rectification and filter is flat, so that the emergency power supply test section 302 of DC power supply to take place; Use is supplied with the DC power supply that provides test section 300 or the above-mentioned emergency power supply test section 302 from above-mentioned power supply commonly used and is carried out work, according to the supply of the power supply commonly used of supplying with test section 300 from above-mentioned power supply commonly used whether, send during through setting-up time power supply commonly used supply with or cut off timer 304 with switch controlling signal; When above-mentioned power supply commonly used is supplied with test section 300 and can't be detected power supply commonly used, the power supply of being exported according to above-mentioned emergency power supply test section 302, cut off after being connected of emergency load 308 and power supply supply lines commonly used to emergency load 308 supply emergency power supplies, and when above-mentioned power supply commonly used is supplied with test section 300 and can be detected power supply commonly used, supply with the mains switch portion 306 of power supply commonly used when cutting off emergency power supply to emergency load 308 according to the switch controlling signal of above-mentioned timer 304 outputs.
Above-mentioned power supply commonly used is supplied with in the test section 300, and power supply commonly used is connected with the light-emitting component of capacitor C1 and photoelectrical coupler PC by bridge diode BD1 and resistance R 1.
At emergency power supply test section 302, emergency power supply is connected with parallel resistor R2 level capacitor C2 with bridge diode (BD2), is connected with voltage stabilizing didoe ZD and ground capacitor C4 by resistance R 3 when the lead-out terminal of bridge diode (BD2) is connected with ground capacitor C3.
At above-mentioned timer 304, above-mentioned power supply commonly used is supplied with the collector electrode that is subjected to optotransistor of the photoelectrical coupler PC of test section 300, be connected by the base stage of resistance R 4 with transistor Q1, the collector electrode of transistor Q1 and ground capacitor C5 and vibration are connected with the trigger terminal of integrated component 31.The tie point of the resistance R 3 of above-mentioned in addition working power supply/emergency power supply test section 302, voltage stabilizing didoe ZD and ground capacitor C4 is connected with integrated component 310 with vibration, this tie point is connected with the trigger terminal of vibration with integrated component 310 by resistance R 5, resistance R 6 and diode D1 simultaneously, the tie point of resistance R 6 and diode D1 is connected with integrated component 310 with ground capacitor C7 and vibration by resistance R 7.Simultaneously, above-mentioned vibration is passed through resistance R 8 with the lead-out terminal OUT of integrated component 310, be connected with the base stage of transistor Q2, the collector electrode of transistor Q2 is connected with the lead-out terminal of the bridge diode (BD2) of above-mentioned emergency power supply test section 302 and the tie point of ground capacitor C3, and this tie point is connected with the base stage of transistor Q3 simultaneously.
Form by following two parts in above-mentioned mains switch portion 306: first switch portion 312, when above-mentioned power supply commonly used is supplied with test section 300 and can not be detected power supply commonly used, utilize the power supply of above-mentioned emergency power supply test section 302 outputs to carry out work, connect emergency power supply, be supplied in emergency load 308, cut off emergency power supply when test section 300 can detect power supply commonly used and supply with at above-mentioned power supply commonly used; Second switch portion 314, when above-mentioned timer 304 outputs dump commonly used is used switch controlling signal, cut off power supply commonly used and make it to be supplied in emergency load 308, when timer 304 outputs dump commonly used is used switch controlling signal, be supplied in emergency load 308 power supplys commonly used.
In above-mentioned first switch portion 312, the lead-out terminal of the bridge diode BD2 of above-mentioned working power supply/emergency power supply test section 302 and the tie-point of ground capacitor C3 be opposite direction diode D2 and the resistance R 10 by being connected in parallel successively, ground capacitor C8, resistance R 11 is connected with the base stage of transistor Q4, the collector electrode of transistor Q4 is connected with opposite direction diode D3 and relay R Y1 that the elimination surge is used, the switch RYS1 of relay R Y1 and relay R Y2 and emergency power supply are connected in series, the switch RYS21 of relay R Y2, RYS22 are connected between emergency power supply and the emergency load 308.
At above-mentioned relay R Y1, RY2, switch RYS1 when RY3 starts, RYS21, RYS22, RYS3 connects, switch RYS41 when above-mentioned relay R Y4 starts, RYS42 connects.
In said structure, though between mains switch portion 306 and emergency load 308, do not illustrate circuit breaker, the circuit breaker of being made up of ELCB and MCCB can be set, detect overload and overcurrent and leakage current etc.
Fig. 4 is resident family of existing unit lamp electric power loop and an emergency light electric power loop structure chart at ordinary times,
Fig. 5 is resident family of unit the lamp electric power loop and the emergency light electric power loop structure chart at ordinary times of the embodiment of the invention.
With reference to above-mentioned Fig. 3～Fig. 5, describe the work of the commonly used/emergency power supply distribution board of the embodiment of the invention in detail.
Unit resident normal/emergency power supply switch board of the present invention, when power supply commonly used is introduced into by resident family of unit meter and by power input 100 commonly used, main circuit breaker 102 can detect the current status of the power supply commonly used that is introduced into, and cuts off the supply of power supply commonly used when overcurrent or leakage current flow through.In addition, a plurality of auxilliary circuit breakers 204,206,208 outputs by electric wire and above-mentioned main circuit breaker 102 are connected in parallel, from then on electric wire branch separately supplies with to each electric loading respectively, the supply of cutting off the electricity supply respectively when overcurrent or leakage current flow through above-mentioned each electric loading.Above-mentioned a plurality of auxilliary circuit breaker 204,206,208 is connected with a plurality of electric heating appliances etc. with electric light respectively.The various lamps in the parlor in for example auxilliary circuit breaker 204 and the resident family of unit are connected with setting socket on the wall; Auxilliary circuit breaker 206 is connected with the socket that is provided with on the wall with the various lamps in inner room; Auxilliary circuit breaker 208 is connected with the socket that is provided with on the wall with the various lamps of cabin and balcony.Therefore when supplying with power supply commonly used, by a plurality of auxilliary circuit breakers 204, to various electric lights and the electric heating appliance and the socket normal supply power supply of inner room, cabin and the balcony etc. of resident family of unit.
In addition, power supply commonly used by power input terminal introducing commonly used, by not shown circuit breaker, be introduced in the automatic converter section 220 of power supply, at this moment if describe the work of commonly used/automatic converter section 220 of emergency power supply in detail, power supply then commonly used is supplied with the illuminating part that is introduced in photoelectrical coupler PC after the bridge diode BD1 rectification of test section 300 by resistance R 1 by power supply commonly used.
Therefore, when introducing power supply commonly used by power input terminal 100 commonly used, the illuminating part of photoelectrical coupler PC carries out work, luminous, the light that received by optotransistor to send of photoelectrical coupler PC and conducting.
Here, power supply is used in normal supply always, make that optical coupler PC's be subjected to the optotransistor conducting, then flow to ground connection from the power supply of the resistance R 10 of 302 outputs of above-mentioned emergency power supply test section and first switch portion 312 by mains switch portion 306 optotransistor that is subjected to by optical coupler PC, base stage to the transistor Q4 of first switch portion 314 applies electronegative potential, and transistor Q4 disconnects thus.
Thus, Y1 is not driven because of relay R, and the switch RYS1 of relay R Y1 disconnects, thereby relay R Y2 is not driven, and the switch RYS21 of relay R Y2, and RYS22 disconnects, and can not supply with emergency power supply to emergency load 308.
In addition, be subjected to the optotransistor conducting along with above-mentioned photoelectrical coupler PC, the transistor Q1 of timer 304 disconnects, power supply commonly used is supplied with the voltage of test section 300 outputs by resistance R 6, R7 and diode D1 give capacitor C5, the C7 charging makes vibration keep high potential with the trigger terminal of integrated component 310 always, and it is low signal that vibration is supplied with switch controlling signal by lead-out terminal OUT output power supply commonly used with integrated component 310.
The low signal that above-mentioned vibration is exported with integrated component 310 is applied to the base stage of transistor Q2, and transistor Q2 is disconnected, and transistor Q3 conducting, and the transistor Q5 of the second switch portion 314 of mains switch portion 306 is disconnected.
Therefore, relay R Y3 is not driven, and the switch RYS3 of relay R Y3 disconnects, relay R Y4 can't be driven, and the switch RYS41 of relay R Y4, RYS42 continue closed, power supply commonly used is by the switch RYS41 of relay R Y4, and RYS42 is supplied in emergency load 308.Above-mentioned emergency load 308 is family expenses automatic equipment, cooling-heating room equipment, electronic type fire extinguisher, emergency light, gas alarm valve etc.
But because of having a power failure and the cut-out power supply commonly used of power transmission sequence when importing, the illuminating part of photoelectrical coupler PC quits work, and is subjected to optotransistor not accept light to disconnect because of photoelectrical coupler PC.
In addition, when the emergency power supply by emergency power supply input terminal 202 input is input to the automatic converter section 220 of commonly used/emergency power supply by not shown circuit breaker, emergency power supply is by the resistance R 2 and the capacitor C2 of emergency power supply test section 302, and carry out bridge rectifier by bridge diode, filter by capacitor C3 is flat be converted become DC power supply after, as working power supply power switch portion 306, simultaneously by resistance R 3, after being converted to constant voltage by voltage stabilizing didoe ZD and capacitor C4, the vibration of supplying with timer 304 with integrated component 310 as working power.
Under such state, the power supply of above-mentioned emergency power supply test section 302 outputs is given capacitor C8 charging by the resistance R 10 of first switch portion 312, be applied to simultaneously the base stage of transistor Q1 again by the resistance R 4 of timer 304, make transistor Q1 conducting, and electronegative potential is applied to the trigger terminal of vibration with integrated component 310, is high signal from lead-out terminal OUT output dump commonly used with switch controlling signal.
The base stage that the high signal that above-mentioned vibration is exported with integrated component 310 is applied to transistor Q2 makes it conducting, thereby transistor Q3 disconnects.
Thereupon, by the base stage that the resistance R 12R13 of second switch portion 42 is applied to transistor Q5, make it conducting by the power supply of emergency power supply test section 302 output; Relay R Y3 is driven, and makes switch RYS3 closure, thereby relay R Y4 is driven, and switch RYS41RYS42 disconnects, and the supply lines of power supply commonly used is separated with emergency load 308.
In addition, power supply by above-mentioned emergency power supply test section 302 outputs is given capacitor C8 charging by the resistance R 10 of first switch portion 312, be applied to simultaneously the base stage of transistor Q4 again by resistance R 11, thereby transistor Q4 conducting, current-collector RY1 is driven, switch RYS1 closure, along with switch RYS1 closure, current-collector RY2 is driven, switch RYS21, the RYS22 closure, thereby emergency power supply is by switch RYS21, RYS22 passes through the not shown supply emergency of the cutter load 308 of detection of excessive current or leakage current again.
When supplying with emergency power supply at once after power supply commonly used is cut off,, just can influence emergency load 308 ground supply powers not here, if the phase place of power supply commonly used and emergency power supply is consistent.
But, when the phase place of power supply commonly used and emergency power supply is inconsistent, in the moment of conversion electric power, supply with overvoltage to load, the overvoltage of this supply is that 180 incidences when spending are the highest at the phase difference of power supply commonly used and emergency power supply, the switch RYS21 of the relay R Y2RY4 of Switching Power Supply when this thing happens, RYS22, RYS41, the impaired and load 50 of the contact point of RYS42 is because of the overvoltage damaged.
Therefore, the present invention possesses the time constant circuit of being made up of resistance R 10 and capacitor C8 in second switch portion 314, second switch portion 314 carries out work at once when not using the supply of power supply always, cut off the supply lines of power supply commonly used, first switch portion 312 is supplied with emergency power supply in the time constant of passing through the time constant circuit that is made of resistance R 10 and capacitor C8 after the time, thereby make that even the phase place of power supply commonly used and emergency power supply is inconsistent, can not supply with ultra-voltage to emergency load 308 yet.
As mentioned above, when under emergency load 308 provides the state of emergency power supply, supplying with power supply commonly used once more because of the cause that has a power failure, the photoelectrical coupler PC that power supply commonly used is as mentioned above supplied with test section 300 carries out work and conducting is subjected to optotransistor, and the power supply that is stored in the capacitor C8 of first switch portion 312 will discharge at once by the optotransistor that is subjected to of photoelectrical coupler PC.
At this moment, the base stage of transistor Q4 is applied in electronegative potential and disconnects, and relay R Y1 is not driven switch RYS1 is disconnected, thereby relay R Y2 can't work, switch RYS21, and RYS22 disconnects, thereby does not have the supply of emergency power supply in emergency load 308.
In addition, along with the power supply of above-mentioned capacitor C8 all discharges, the base stage of the transistor Q1 of timer 304 is applied in electronegative potential and disconnects, thereby capacitor C5 is recharged again, and to the trigger terminal of vibration with integrated component 310, vibration triggers with integrated component 310, and behind the process certain hour, it is low signal that vibration is supplied with switch controlling signal at lead-out terminal OUT output power supply commonly used with integrated component 310.
Then transistor Q2 disconnection, transistor Q3 conducting, so the transistor Q5 of second switch portion 42 disconnects, relay R Y3 is not driven, switch RYS3 disconnects, and along with the disconnection of switch RYS3, relay R Y4 does not work, switch RYS41, the RYS42 closure, power supply commonly used is supplied with emergency load 308.
When therefore the supply of power supply commonly used being arranged, by a plurality of circuit breakers 204, various electric lights and the electric heating appliance and the socket of inner room, cabin and balcony etc. in the resident family of unit arrived in the power supply normal supply, simultaneously by commonly used/emergency power supply converter section 220, supplies with power supply commonly used to emergency load 308.
But,, make the emergency power supply of import by emergency power supply input 202, by using/emergency power supply converter section 220 supply emergency load 308 always because of having a power failure or the cut-out of power transmission sequence use under the situation that power supply do not resupply.
But in the past as shown in Figure 4, with feeder distribution centre 10 irrespectively, emergency power supply circuit 406 is set in addition, when having a power failure, only light emergency light 404, and when supplying with power supply commonly used by feeder distribution centre 10, often the firm lamp 400 commonly used that is provided with in addition of use.
With respect to this, in the present invention, as shown in Figure 5, when supplying with power supply commonly used by the commonly used/emergency power supply converter section 220 that is arranged on feeder distribution centre 200 or during emergency power supply, can both light emergency light 404, make this emergency light 404 be also used as lamp often, thereby can reduce expense.Switch 402 as above shown in Figure 4 is the switches that are used to light and extinguish firm lamp 400 commonly used, and switch 402 as shown in Figure 5 is to light and extinguish to be also used as the emergency light and the switch of the emergency light 404 of lamp often.
In addition, the family expenses automatic equipment that is provided with in resident family of unit when having a power failure is supplied with emergency power supply, thus needn't be equipped with reserve battery in addition, thus the minimizing expense.
In addition, because of needn't preparing reserve battery in addition to the family expenses automatic equipment again, thus can reduce the volume of the outer housing box of the family expenses automatic equipment that is used to pack into, thus the generation problem of crackle solved.
Fig. 6 is provided with power supply commonly used/emergency power supply distribution board, makes various emergency loads carry out the suitable illustration figure of the power circuit of work for another embodiment of the present invention.
Consist of the following components:
Power input terminal 502 commonly used is fixed for introducing the electric wire by the power supply commonly used of resident family of unit meter introduction; Emergency power supply input terminal 504 is used for fixing the electric wire that is used to introduce emergency power supply; Main circuit breaker 506, it is connected with above-mentioned power input terminal 502 commonly used, detects the current status of the power supply commonly used that is introduced into, if having overcurrent or leakage current to flow through the supply of then cutting off power supply commonly used; A plurality of auxilliary outages stream devices 508,510,512 are connected by the lead-out terminal of electric wire with above-mentioned main circuit breaker 506, and thus electric wire separately branch supply with each electric loading, when overcurrent flows through above-mentioned each electric loading, cut off each power supply supply; Commonly used/the automatic converter section 514 of emergency power supply, by power supply commonly used and the emergency power supply introduced from above-mentioned power input terminal 502 commonly used and emergency power supply input terminal 504 respectively, when not using the supply of power supply always, supply with emergency power supply, and cut-out emergency power supply and supply power supply commonly used when using power supply always are supplied with in recovery; Emergency connects up 600, is connected the output of above-mentioned using always/automatic converter section 514 of emergency power supply, connects up in resident family of unit; Cooling-heating room is connected in parallel respectively in the above-mentioned emergency wiring 600 with equipment 602, emergency light 604, family expenses automatic equipment 606, electronic type fire extinguisher 608, gas alarm valve 810; Switch 610 is lighted when being used to have the supply of power supply commonly used or is extinguished above-mentioned emergency light 604; Relay 612 is connected a terminal of above-mentioned emergency power supply input terminal 504, when the supply of emergency power supply is arranged and the ON/OFF of switch 610 have nothing to do, light above-mentioned emergency light 604.
In said structure, between power input terminal 502 commonly used and commonly used/automatic converter section 514 of emergency power supply, circuit breaker can be set; Between above-mentioned emergency power supply input terminal 504 and commonly used/automatic converter section 514 of emergency power supply, circuit breaker can be set.
In addition, can between power input terminal 502 commonly used and emergency power supply input terminal 504 and commonly used/automatic converter section 514 of emergency power supply, circuit breaker be set, and in the emergency wiring 600 of the output that is connected the automatic converter section 514 of commonly used/emergency power supply, circuit breaker be set.
Unit resident normal/emergency power supply switch board 500 of the present invention, at power supply commonly used by resident family of unit meter, and when being introduced into, by main circuit breaker 506 and a plurality of auxilliary circuit breaker 508 by power input terminal 502 commonly used, 510,512 to general load supply power supply commonly used.Main circuit breaker 506 detects the current status of the power supply commonly used that is introduced into, and cuts off the supply of power supply commonly used when having overcurrent to flow through.In addition, a plurality of auxilliary circuit breakers 508,510,512 are connected in the output of main circuit breaker 506 in parallel by electric wire 516, respectively from this electric wire separately branch supply with to each general load, when when above-mentioned each general load flow is crossed overcurrent, the supply of cutting off the electricity supply respectively.Above-mentioned a plurality of auxilliary circuit breaker 508,510,512 is connected with a plurality of electric heating appliances etc. with electric light respectively.Such as, the various lamps in the parlor in auxilliary circuit breaker 508 resident families of the unit of being connected and setting socket on the wall; Auxilliary circuit breaker 510 is connected the various lamps and the setting socket on the wall in inner room; Auxilliary circuit breaker 512 is connected the various lamps and the setting socket on the wall of cabin and balcony.Above-mentioned using always/automatic converter section 514 of emergency power supply has the structure identical with Fig. 3, has the conversion work of identical power supply commonly used and emergency power supply with it, therefore omits explanation.Above-mentioned general load be meant in resident family of unit except that as the cooling-heating room of emergency load with all electric loadings equipment 602, emergency light 604, family expenses automatic equipment 606, electronic type fire extinguisher 608, the gas alarm valve 610.
At first, when power supply was used in supply always, power supply arrived various electric lights and the electric heating appliance and the socket of inner room, little residence and balcony etc. in the resident family of unit by a plurality of auxilliary circuit breaker 508,510,512 normal supplies.And supply with when using power supply always, can not supply with the emergency power supply to emergency power supply input terminal 504, therefore power supply commonly used is selected in automatic converter section 514 meetings of commonly used/emergency power supply, supplies with cooling-heating room equipment 602, emergency light 604, family expenses automatic equipment 606, electronic type fire extinguisher 608, gas alarm valve 610 by emergency wiring 600.Therefore cooling-heating room carries out work with equipment 602, emergency light 604, family expenses automatic equipment 606, electronic type fire extinguisher 608, gas alarm valve 610 by power supply commonly used.Therefore at this moment be connected the relay 612 of a terminal of emergency power supply input terminal 504, because of coil L1 no current flows through, switch SW 1 is an off-state, according to the conducting and the disconnection of switch 610, lights or extinguishes emergency light 604.
But cut-out because of power failure or power transmission sequence, do not resupply under the situation of power supply commonly used, supply with emergency power supply by emergency power supply input 504, the emergency power supply that the automatic converter section 220 of commonly used/emergency power supply is selected by 504 introducings of emergency power supply input terminal is supplied with equipment 602, emergency light 604, family expenses automatic equipment 606, electronic type fire extinguisher 608, gas alarm valve 610 to cooling-heating room by emergency wiring 600.Therefore, cooling-heating room utilizes emergency power supply to carry out work with equipment 602, emergency light 604, family expenses automatic equipment 606, electronic type fire extinguisher 608, gas alarm valve 610.At this moment be connected the relay 612 of an end of emergency power supply input terminal 504, because of electric current flows through coil L1, switch SW 1 is a conducting state, therefore irrespectively lights emergency light 604 with the conducting/disconnection of switch 610.
In specific embodiments of the invention, though be provided with the automatic converter section of commonly used/emergency power supply at feeder distribution centre with automatic conversion power supply commonly used and emergency power supply, and supply with to the emergency load, but, irrespectively accept power supply commonly used and emergency power supply with feeder distribution centre, behind commonly used/urgently needed power supply automatic converter section conversion power supply commonly used or emergency power supply, supply with the emergency load, also do not exceed scope of the present invention and be achieved.At this moment, can on power supply commonly used and emergency power supply incoming line, circuit breaker be set; Can on above-mentioned power input line commonly used and emergency power supply incoming line, circuit breaker be set yet, and circuit breaker be set at the output of above-mentioned using always/automatic converter section of emergency power supply.
Fig. 7 is the structure chart of the power supply automatic converting device of a specific embodiment of the present invention.
Consist of the following components:
Emergency power supply input terminal 10 is fixed for introducing from the electric wire of generator to the emergency power supply of resident family of unit supply; Bimetal leaf bimetal14, according to the temperature of the electric wire that is connected above-mentioned emergency power supply input 10, the automatic shutter electric contact; Electric leakage perceptron 20 is made of zero phase current transformer ZCT16 and arithmetic unit 18, is used for perception electric leakage state; Electrical leakage breaking device 22 by above-mentioned electric leakage perceptron 20 perception electric leakage, when flowing through overcurrent, cuts off the supply of emergency power supply; Test Switchboard 24 is arranged between above-mentioned zero phase current transformer ZCT16 and the arithmetic unit 18, the normal operating conditions of test electrical leakage breaking device 22; Power input terminal 12 commonly used is fixed for introducing the electric wire by the power supply commonly used of resident family of unit meter introducing; Emergency power supply input terminal 504 is used for fixing the electric wire that is used to introduce emergency power supply; Converter section 26, automatically change in such a way, promptly by power supply commonly used and the emergency power supply introduced from above-mentioned power input terminal 12 commonly used and emergency power supply input terminal 10 respectively, when not using the supply of power supply always, supply with emergency power supply, and cut-out emergency power supply and supply power supply commonly used when using power supply always are supplied with in recovery; Commonly used/emergency light 36, it is connected between first output 30 and second output 32 of above-mentioned converter section 26, and second output 32 continues jointly with the 3rd output 34 and is connected; Emergency load 38 is connected between above-mentioned first output 30 and above-mentioned second output 32.Above-mentioned relay portion 26 has the input of 4 lines and 3 lines are imported.Above-mentioned electrical leakage breaking device 22 is such as using ELCB.
Above-mentioned emergency load 38 comprises: various door lock assemblies are based on the door lock assembly of fingerprint or infrared ray identification, the door lock assembly that utilizes password, card door lock assembly etc. and video phone, telephone set, coal gas, antitheft, the machine of taking precautions against natural calamities, can carry out cooling-heating room work.
Fig. 8 is the detailed circuit diagram of converter section 26 of Fig. 7 of the embodiment of the invention.
Consist of the following components:
Utmost point fuse POLE-FUSEF1 is connected an end of using power supply 12 always;
Zener diode ZD1 makes from the direct voltage of above-mentioned rectification part 42 outputs and exports with burning voltage;
The first relay R Y1, form by induction coil L1 and two switch SW 1～SW2 of being connected in parallel with above-mentioned Zener diode ZD1, connect by the mode electric contact of supplying with power supply commonly used when adding above-mentioned direct voltage outside, when the direct voltage that does not add, connect according to the mode electric contact that cuts off power supply commonly used, supplies with emergency power supply;
The second relay R Y2, induction coil L2 and a switch SW 3 by first LED 1 that is connected in parallel with above-mentioned induction coil L1 and is connected in series with resistance R 3, lights when supplying with power supply commonly used and the output that is connected above-mentioned rectification part 42 are formed, do not have additional hours at above-mentioned direct voltage, unconditionally light the emergency light that is connected on the above-mentioned emergency power supply line;
Fuse F2 is connected above-mentioned first output 30.
With reference to above-mentioned Fig. 7 and Fig. 8, describe the work to power supply commonly used and the automatic conversion of emergency power supply of the embodiment of the invention in detail.
By not shown resident family of unit meter and circuit breaker, when using power supply always from using power input terminal 12 inputs always, the power supply commonly used of this input is applied to converter section 26.At this moment, when power supply commonly used is too high, utmost point fuse POLE-FUSEF1 will cut off the supply of power supply commonly used.In addition, power supply commonly used by resistance R 1, is applied to the rectification part 42 that is made of bridge diode D1～D4 and capacitor C2 behind R2 and the capacitor C1 regulation voltage.42 pairs of power supplys commonly used of rectification part carry out full-wave rectification and filter is flat, output dc voltage.Zener diode ZD1 controls overvoltage, makes from the certain commutating voltage of above-mentioned rectification part 42 outputs.Direct voltage by above-mentioned rectification part 42 outputs, be applied to the induction coil L1 of the first relay R Y1, switch SW 1～SW2 alternation of the first relay R Y1 when above-mentioned induction coil L1 has electric current to flow through, common terminal c is connected to contact a, supply with power supply commonly used to first and second output 30,32.In addition, the voltage of being exported by rectification part 42 is applied to bias resistance R6 by resistance R 4 and diode D5, R7, and by above-mentioned bias resistance R6, the R7 dividing potential drop adds to the base stage of transistor Q1 outward, and transistor Q1 connects.At this moment, Zener diode ZD2 controls the overvoltage of the voltage that adds by above-mentioned resistance R 4 and diode D5.Above-mentioned transistor Q1 one connects, then the induction coil L2 of the second relay R Y2 has electric current to pass through, the switch SW 3 of the second relay R Y2 is carried out work, common terminal c is connected to contact b, makes the emergency power supply that supplies to emergency power supply input 10 not be applied to commonly used/emergency light 36 or emergency load 38 thereby cut off emergency power supply.Like this, do not having under the normal condition that has a power failure, converter section 26 makes the power supply of introducing by power input terminal 12 commonly used commonly used supply to commonly used/emergency light 36.If supply with power supply commonly used to commonly used/emergency light 36, then the user can console switch 40, lights or extinguishes commonly used/emergency light 36, is used as primary light and uses.In addition, when the supply that power supply commonly used is arranged, for example make first LED 1 light up as green, allow the user can confirm power supply condition of supplying commonly used by resistance R 3.
But,, supply with emergency power supplies by emergency power supply input 10 because of having a power failure or the cut-out of power transmission sequence can't supply with power supply commonly used the time.If the not supply of power supply commonly used at this moment, rectification part 42 does not just have voltage output, and the induction coil L1 of the first relay R Y1 does not have electric current to pass through.If do not have passing through of electric current at induction coil L1, then switch SW 1～SW2 alternation of the first relay R Y1, common terminal c is connected to contact b, cut off power supply commonly used to first and second output 30,32 supply, and the conversion emergency power supply, make the emergency power supply that is input to emergency power supply input 10 to first and second output 30,32.In addition, because of rectification part 42 has voltage output, so the bias-voltage that adds to the base stage of transistor Q1 not, transistor Q1 disconnects.Above-mentioned transistor Q1 one disconnects, then the induction coil L2 at the second relay R Y2 does not have electric current, thereby the switch SW 3 of the second relay R Y2 carries out work, and common terminal c is connected to contact a, changes to make emergency power supply to the three outputs of supplying with to emergency power supply input terminal 10 34.Like this, during power failure, converter section 26 conversion emergency power supplies make that lighting input by the emergency power supply of emergency power supply input terminal 10 introducings uses always/emergency light 36, supplies to emergency load 38 simultaneously.At this moment, in case supply with emergency power supply to commonly used/emergency light 36, then irrelevant with the operation of switch 40, light commonly used/emergency light 36 and be used as the primary light use.In addition, when the supply of emergency power supply, such as making second LED 2 be lit up as redness, allow the user can confirm the state of emergency power supply by resistance R 8.
Moreover, will be by the power supply of power input terminal 12 introducings commonly used, by converter section 26, when supplying with, be cut off if use power supply always because of having a power failure by first and second output 30,32, then the charging of delay circuit 44 is at capacitor C3, C4, the power supply discharge certain hour of C5.In above-mentioned charging at capacitor C3, C4, till the discharge of the power supply of C5, transistor Q1 continues to keep conducting state, the induction coil L2 of the second relay R Y2 has electric current to pass through, the 3rd switch SW 3 makes common terminal c be connected to contact a.Afterwards, after the discharge of certain hour finished, transistor Q1 disconnected, and the induction coil L2 of the second relay R Y2 does not have electric current to flow through.If on the induction coil L2 of the above-mentioned second relay R Y2, do not have flowing through of electric current, then the second relay R Y2 makes the 3rd switch SW 3 connect common terminal c and contact b, the conversion emergency power supply makes the power supply of introducing by emergency power supply input 10 supply to commonly used/emergency light 40 and emergency load 38.Therefore,, supply with emergency power supply, prevent that the short circuit of power supply commonly used and emergency power supply from taking place because of after the power supply commonly used that has a power failure is cut off a period of time.
In contrast, will be by the emergency power supply of emergency power supply input terminal 10 introducings, by converter section 26, when supplying with by first～the 3rd output 30,32,34, if power supply commonly used is supplied to once more, then by the voltage of rectification part 42 output capacitor C3 to delay circuit 44, C4, the C5 certain hour that charges.To above-mentioned capacitor C3, C4, till the C5 charging finished, transistor Q1 continued to keep off-state, and the induction coil L2 of the second relay R Y2 does not flow through because of there being electric current, and the 3rd switch SW 3 makes common terminal c be connected to contact b.Afterwards, after the discharge of certain hour finishes, transistor Q1 conducting, the induction coil L2 of the second relay R Y2 has electric current to flow through.In case the induction coil L2 of the above-mentioned second relay R Y2 has electric current to flow through, then the 3rd switch SW 3 work of the second relay R Y2 make common terminal c be connected to contact a, make power supply commonly used supply to commonly used/emergency light 40 by power input 12 commonly used.Therefore, because of power failure is supplied with when the supply of power supply commonly used being arranged once more after the emergency power supply, through supplying with power supply commonly used after the certain hour, thereby prevent power supply commonly used and emergency power supply is short-circuited, prevent that simultaneously power supply adverse current commonly used is to emergency power supply input terminal 10.
The function of unaccounted here fuse F2 is, is connected first output 30, if detect overvoltage when the supply of emergency power supply or power supply commonly used, then cuts off the electricity supply automatically, prevents the fire that causes because of electric leakage etc.
As mentioned above, according to the present invention, can be stably to building supply powers such as apartment house and office buildings; Can reduce the raw material original cost; Supply with at the power supply of load-side wired circuit, adopt commonly used/emergency button SWITTCHING dual-purpose three-circuit mode to replace four circuit of existing each two circuit commonly used, emergent two circuit with emergent common two circuit commonly used, reduce the prices of raw and semifnished materials thereby can reduce to connect up.Use apparatus of the present invention, when resident family of unit and circuit one side and load one side generation electrification, can in time cut off power supply commonly used and emergency power supply, prevent that the electrical equipment accident that invades other resident families from taking place, and keep with operating switch easily.
Under existing unidirectional situation, MCCBMOLDED CASE CIRCUIT BRAKER and ELCBEARTH LEAKAGE CIRCUIT BERAKER, ELCB can not use input of TW two wire power supply and TW two wire power supply to export and realize the commonly used of power supply and four inputs of meeting an urgent need.But the present invention can enough two inputs commonly used, emergent two import automatic control power supplies and realize the three-wire type input, enough first and second outputs 30 of civil time energy, 32 outputs, and energy enough first reaches～the three output 30 when the supply of emergency power supply, 32,34 supply with emergency power supply, can supply with emergency power supply to emergency load 38 and commonly used/emergency light 36 during power failure.At this moment switch 40 conductings between second output 34 and the commonly used/emergency light 36, so even emergency power supply is input into from commonly used/emergency light 36 or emergency load 38, first to the 3rd switch SW 1～SW3 conducting because of converter section 26, so can't adverse current extremely use mains side always, prevent that the power supply adverse current is to other resident families.
In addition; resident family of the described power supply automatic converting device of the present invention unit of being arranged on distribution board the time; even when emergent particularly in fire incident or when the power supply accident, line short etc. of load-side takes place in the resident family when having a power failure; also can protect the circuit of each resident family; thereby power supply supplies to the emergency load, can stably provide power supply by resident family.
In addition, when in the resident family of building ground unit of apartment house and office building etc., device of the present invention being set, provide stable power, and primary light is used as dual-purpose electric light emergent, commonly used replaces use, can save cost economically by emergency power supply commonly used; Can supply with the emergency load to the three-wire type out-put supply that supplies to emergency light commonly used.
As mentioned above, the present invention possesses automatic conversion power supply commonly used and answers urgent telegram at resident family of unit distribution board The source commonly used/the emergency power supply converter section so that under normal condition, supply with power supply commonly used, when emergent Supply with emergency power supply, and emergency light is also used as often lamp, emergency light, therefore need not possess in addition should Anxious lamp has reduced expense.
Moreover, need not vertical side by side mode be set in order when having a power failure, to light emergency light between resident family Stringing, prevented the interlayer noise, the many life of having eliminated that private life is encroached on and having caused because of noise Inconvenience.
In addition, the situation of family expenses automatic equipment has following several advantage: the emergency power supply is provided, and need not Prepare reserve battery, dwindled the casing box volume for the family expenses automatic equipment of packing into, reduced crackle The root that takes place; The charging device and the reserve battery that do not need reserve battery are so reduced expense.
In addition, also has following advantage: can provide emergency power supply in self-extinguishing during breaking out of fire during power failure Device can be suppressed fire in early days, takes precautions against the generation of the greatest damage that is brought by fire, and when having a power failure Supply with emergency power supply in gas alarm valve, the fire incident that advance preventing causes because coal gas leaks outside.
Claims (2)
1. power supply automatic converting device is characterized in that: comprising:
Rectification part is to carrying out full-wave rectification by the AC power of power input terminal introducing commonly used and filtering and put down, output dc voltage;
First relay, be connected the output of above-mentioned rectification part, by first induction coil (L1) and two switch (SW1～SW2) constitute, connect contact according to the mode of supplying with power supply commonly used when adding above-mentioned direct voltage outside, when not adding above-mentioned direct voltage, according to cutting off power supply commonly used, making emergency power supply ways of connecting connect contact by the input of emergency power supply input terminal;
Second relay (RY2), second induction coil (L2) and a switch (SW3) by the output that is connected above-mentioned rectification part constitute, when when not having the applying of direct voltage, supplying with above-mentioned emergency power supply, unconditionally light the emergency light that is connected on the above-mentioned emergency power supply line;
Delay circuit (44), one end is connected above-mentioned second relay, reception is by the voltage of above-mentioned rectification part output, when power supply commonly used is cut off, the contact of above-mentioned second relay is connected to emergency power supply behind the delay certain hour, recover once more to supply with when using power supply always under the state of supplying with emergency power supply, the contact of above-mentioned second relay is connected to power supply commonly used after delay after a while, is short-circuited to prevent power supply commonly used and emergency power supply.
2. power supply automatic converting device according to claim 1 is characterized in that: also comprise
Be connected in parallel first light-emitting diode of expression power supply supply condition commonly used with above-mentioned first induction coil (L1);
Be connected between the above-mentioned emergency power supply input terminal second light-emitting diode of expression emergency power supply state.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20030018187 | 2003-03-24 | ||
| KR10-2003-0018187A KR100500891B1 (en) | 2003-03-24 | 2003-03-24 | Switchboard for supplying normal and emergency power of separate household |
| KR10-2003-0088136A KR100535857B1 (en) | 2003-12-05 | 2003-12-05 | Automatic power switching device |
| KR20030088136 | 2003-12-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1551449A CN1551449A (en) | 2004-12-01 |
| CN100373744C true CN100373744C (en) | 2008-03-05 |
Family
ID=34380461
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100287489A Expired - Fee Related CN100373744C (en) | 2003-03-24 | 2004-03-15 | Unit resident normal/ emergency power supply switch board and its power supply automatic converting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100373744C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1829035B (en) * | 2006-04-10 | 2010-07-28 | 贵阳铝镁设计研究院 | Building electric fire hidden trouble alarm power distribution method and its circuit |
| KR20080110561A (en) * | 2008-10-14 | 2008-12-18 | 이원강 | General load control type combined fire protection private power plant |
| KR101622677B1 (en) * | 2015-11-03 | 2016-05-20 | 에이치제이산전(주) | Auxiliary power unit for emergency light upon fire state or power failaure |
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| CN85200436U (en) * | 1985-04-01 | 1986-02-19 | 张腾广 | Multiple purpose lamp for emergency lighting in case of power cut. |
| CN2030384U (en) * | 1988-04-07 | 1989-01-04 | 沈阳市房产电梯厂 | Power distributor |
| US5278453A (en) * | 1988-05-18 | 1994-01-11 | Siemens Nixdorf Informationssysteme | Constant-voltage supply system with several constant-voltage sources |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1551449A (en) | 2004-12-01 |
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