EP0358654A1 - Supply system for uninterruptible electric power - Google Patents
Supply system for uninterruptible electric powerInfo
- Publication number
- EP0358654A1 EP0358654A1 EP19880903258 EP88903258A EP0358654A1 EP 0358654 A1 EP0358654 A1 EP 0358654A1 EP 19880903258 EP19880903258 EP 19880903258 EP 88903258 A EP88903258 A EP 88903258A EP 0358654 A1 EP0358654 A1 EP 0358654A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- set forth
- battery
- fitted
- load
- decoupling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
Definitions
- the present invention relates to a supply system for un ⁇ interruptible electric power, comprising a back-up power unit provided with a battery serving as a source of energy, means for charging the battery, as well as an inverter between the battery and a critical load.
- a rectifier for charg ⁇ ing the batteries and said inverter can also consist of one and the same apparatus, whose operation either as a rectifier or as an inverter depends on the state of a supply mains.
- UPS Uninterruptible Power Supply
- Fig. 1 illustrates a so-called “True-UPS” system
- fig. 1B shows a so-called “Stand-by UPS” system.
- a stand-by system can be technically resolved also in a manner that, when the mains is in proper order, power flows in an inverter from the mains to a battery. Thus, the charging of a battery proceeds through this unit and a separate rectifier is not need ⁇ ed (so-called tri-port system) .
- UPS systems have been commercially available roughly for as long as computers. Earlier, the stand-by source of power was provided by rotary converter, later and at present nearly exclusively by static, electronic converter.
- An object of the invention is to find a solution to such • a demand, i.e. to provide the above type of flexible and thus optimizable UPS system whose need of maintenance is negligible.
- a system of the invention which is .characterized in that a back-up power unit included in the system is fitted in a normal current supply system prior to its branching to a plurality of outlets and the system is provided with outletwise load decoupling switches adapted to be controlled by means of a programmable control means, included in the sys ⁇ tem and programmed for the optimum exploitation of back-up energy.
- fig. 1A shows a general block diagram for a UPS system (True-UPS) .
- Fig. 1B shows another general block diagram for a UPS system (Stand-by UPS) .
- Fig. 2 shows the disposition of components included in a UPS system of the invention in a normal current supply system.
- Fig. 3 shows a block diagram for a smart control unit SU (Smart Unit) included in a UPS system of the invention.
- Smart Unit Smart Unit
- Fig. 4 shows a block diagram for an outletwise active switch AS, connected with a UPS system of the invention and controlled by SU.
- a UPS system shown in fig. 1A includes a conventionally mains-connected rectifier/charger 1 which converts alternating current to direct current and charges a battery 2 serving as a storage of energy.
- An inverter 3 converts the direct current coming from charger 1 or battery 2 to alternating cur ⁇ rent which is supplied to a critical load 4.
- the supply of electric power during a mains failure can also be effected by means of a system shown in fig. 1B wherein, in a normal state, a load 4 is connected through a change-over switch 9 to the mains and a set of accumu ⁇ lators 2 is maintained through a lower-capacity charger 1 at its full charging capacity.
- the change-overswitch 9 transfers the supply of load from the mains through inverter 3 to batteries 2.
- the time taken by such change-over switching is a few milliseconds which is generally ac ⁇ cepted by data processing equipment making up the load.
- UPS Uninter- ruptible Power Supply
- SU Smart Unit
- AS Active Switch
- Shown with a dash-and-dot line in fig. 2 is e.g.. the path of a carrier wave-based command signal be ⁇ tween control unit 6 and decoupling switches 7 along a current supply system.
- a control unit 6 (fig. 3) can be included in the moni ⁇ toring and control unit of a UPS apparatus or it can be separate therefrom.
- a central processing unit 10 (CPU) included in control unit 6 is provided with a memory and a keyboard for manual data feeding.
- the central processing unit 10 (CPU) is adapted to receive fed-in information about battery voltage (U, , ) , battery loading (I , ) and the state of supply system (line ON/OFF) .
- the central pro ⁇ cessing unit controls decoupling switches 7, mounted at the outlets and equipped with an address.
- a code generator 11 included in control unit 6 develops an address code characteristic of each decoupling switch 7 according to which decoupling switch 7 a control command is intended for.
- a decoupl ⁇ ing switch 7 of fig. 4 includes a code analyzing block 12 in which an address code is set.
- Control unit 6 and decoupling switch 7 are in communication with the transmission line through a two-way line signal receiver/ transceiver circuit 13. Such a circuit is commercially available.
- decoupling switch 7 receives a signal from the line or mains, it will react to it according to its own address by switching the load ON or OFF.
- a decoupling switch 7 as shown in fig.
- a load current measuring sensor 14 connected through a current limiter circuit 15 with a controller 16 which controls a switch 17 (e.g. a relay) included in the load circuit.
- a load current, at which said switch 17 operates for decoupling the load from the circuit, is adjustable.
- a current measur ⁇ ing signal is passed from a digitizer 18 in digital form through a signal receiver/transceiver circuit 13 into the mains, from which the control unit 6 receives this load current signal as a feedback signal into the central processing unit 10 (CPU).
- CPU central processing unit
- control unit 6 is to investigate the state of a UPS system and, according to a desired program, to effect a controlled deloading as the charge of a battery is diminishing. Furthermore, on the basis of the current of an individual load, the control unit 6 can generate an alarm or to control the elimination of this load.
- the system is installed in a normal power distribution installation e.g. in an office premises, so that a UPS apparatus is coupled with those arrays of outlets which include data processing equipment or other critical loads.
- the UPS apparatus and control unit 6 can be fitted in the main or group centre 8 of a power distribution installation while the decoupling switches 7 are fitted in the outlets of load equipment.
- said decoupling switch 7 can also be fitted in a group line including a plurality of outlets.
- the UPS apparatus When the normal mains supply fails, the UPS apparatus begins an uninterrupted supply of loading.
- the control unit 6 through the intermediary of decoupling switches 7 cuts off the power supply ' to those loads that do not need back-up power electricity.
- the remaining critical loads receive electricity for a necessary period in a manner that their operations can be stopped in a controlled fashion and that the equipment requiring continuous operation are provided with an optimally long running time within the limits set by available battery capacity.
- the system control unit 6 communicates with outletwise or supply line wise decoupling switches 7 controlling them to open or close as necessary.
- said control unit 6 can control also other office equipment connected with the supply system and, on the other hand, it can receive information delivered from elsewhere (e.g. alarm centres of buildings) .
- the described novel solution is mostly competing with a decentralized UPS system.
- a decentralized system there is an individual UPS apparatus for each unit to be protected.
- the novel solut ⁇ ion includes following advantages:
- the novel system offers further possibilities in equipment development e.g. by giving additional functions to decoupling switches; short-circuit current limiting, measuring of current passing through a switch etc.
- the system and its components can be applied to direct- current systems, wherein especially the electronic short-circuit protection can be used to resolve present practical problems.
Abstract
Un système permettant une alimentation ininterrompue en courant électrique comporte une alimentation de secours pourvue d'une batterie servant de réserve d'énergie, un redresseur ainsi qu'un onduleur. Cette alimentation de secours est montée dans une installation de distribution de courant normale avant d'être dérivée vers une pluralité de boîtes de jonction. Le système comprend des commutateurs (7) de découplage de charge au niveau des boîtes de jonction, conçus pour être commandés au moyen d'un dispositif de commande programmable (6), inclus dans le système et programmé pour l'exploitation optimale de la réserve d'énergie.A system allowing an uninterrupted supply of electric current comprises an emergency power supply provided with a battery serving as energy reserve, a rectifier as well as an inverter. This emergency power supply is mounted in a normal current distribution installation before being diverted to a plurality of junction boxes. The system comprises load decoupling switches (7) at the junction boxes, designed to be controlled by means of a programmable control device (6), included in the system and programmed for the optimal exploitation of the reserve of energy.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI871686 | 1987-04-16 | ||
FI871686A FI871686A (en) | 1987-04-16 | 1987-04-16 | MATARSYSTEM FOER KONTINUERLIG ELKRAFT. |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0358654A1 true EP0358654A1 (en) | 1990-03-21 |
Family
ID=8524338
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19880903258 Withdrawn EP0358654A1 (en) | 1987-04-16 | 1988-04-15 | Supply system for uninterruptible electric power |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0358654A1 (en) |
JP (1) | JPH02503861A (en) |
FI (1) | FI871686A (en) |
WO (1) | WO1988008218A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6215202B1 (en) | 1998-05-21 | 2001-04-10 | Bechtel Enterprises Inc. | Shunt connected superconducting energy management system having a single switchable connection to the grid |
US7786618B2 (en) * | 2008-04-02 | 2010-08-31 | American Power Conversion Corporation | Apparatus, system and method for a UPS |
US8110941B2 (en) | 2009-02-25 | 2012-02-07 | International Business Machines Corporation | Power demand management method and system |
US9735616B2 (en) | 2014-03-13 | 2017-08-15 | General Electric Company | Systems and methods for providing increased fault current capability in uninterruptible power supply systems |
US10135237B2 (en) | 2014-07-30 | 2018-11-20 | Abb Schweiz Ag | Systems and methods for exploiting current capability in static ups |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA774783A (en) * | 1963-08-15 | 1967-12-26 | C. Gambale John | Load computing and shedding apparatus |
US4216384A (en) * | 1977-12-09 | 1980-08-05 | Directed Energy Systems, Inc. | System for monitoring and controlling electric power consumption |
GB2060964A (en) * | 1979-10-20 | 1981-05-07 | Swish Prod | Electronic time-based control system |
DE3521164A1 (en) * | 1985-06-13 | 1986-12-18 | CEAG Licht- und Stromversorgungstechnik GmbH, 6800 Mannheim | MONITORING DEVICE |
JPS63500630A (en) * | 1985-07-23 | 1988-03-03 | マグレガ−,ジェ−ムズ | Distribution main power auxiliary equipment |
-
1987
- 1987-04-16 FI FI871686A patent/FI871686A/en not_active Application Discontinuation
-
1988
- 1988-04-15 EP EP19880903258 patent/EP0358654A1/en not_active Withdrawn
- 1988-04-15 WO PCT/FI1988/000054 patent/WO1988008218A1/en not_active Application Discontinuation
- 1988-04-15 JP JP50333588A patent/JPH02503861A/en active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO8808218A1 * |
Also Published As
Publication number | Publication date |
---|---|
FI871686A (en) | 1988-10-17 |
FI871686A0 (en) | 1987-04-16 |
WO1988008218A1 (en) | 1988-10-20 |
JPH02503861A (en) | 1990-11-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19890929 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE FR GB IT LI LU NL SE |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: VAELIMAEKI, PEKKA, MATIAS Inventor name: POKKINEN, KIMMO, KALERVO Inventor name: TUCKER, TOMMY, NORRIS Inventor name: KUJALA, ANSSI, VEIKKO |
|
17Q | First examination report despatched |
Effective date: 19911127 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19920409 |