WO2000069045A1 - An arrangement in a power supply unit - Google Patents

An arrangement in a power supply unit Download PDF

Info

Publication number
WO2000069045A1
WO2000069045A1 PCT/SE2000/000902 SE0000902W WO0069045A1 WO 2000069045 A1 WO2000069045 A1 WO 2000069045A1 SE 0000902 W SE0000902 W SE 0000902W WO 0069045 A1 WO0069045 A1 WO 0069045A1
Authority
WO
WIPO (PCT)
Prior art keywords
contactor
power
busbar
load
battery
Prior art date
Application number
PCT/SE2000/000902
Other languages
French (fr)
Inventor
Kjell Rundkvist
Håkan BRÄNNMARK
Göte JOHANSSON
Original Assignee
Emerson Energy Systems Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Emerson Energy Systems Ab filed Critical Emerson Energy Systems Ab
Priority to AU47929/00A priority Critical patent/AU4792900A/en
Publication of WO2000069045A1 publication Critical patent/WO2000069045A1/en

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
    • H02J9/002—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which a reserve is maintained in an energy source by disconnecting non-critical loads, e.g. maintaining a reserve of charge in a vehicle battery for starting an engine
    • 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

Definitions

  • the invention relates generally to power supplies and more specifically to an 5 arrangement in a power supply unit for preventing damage to a battery coimected to a power busbar for supplying power to the busbar upon an AC power failure to a rectifier connected to the busbar.
  • the battery is normally disconnected by means of an electromechanical switch, e.g. by tripping a circuit breaker or by opening a contactor.
  • a contactor connected to a capacitance-containing load can be 20 damaged upon closure. This is due to the fact that capacitances, contained in the load, require a large short rush of current upon start-up. Such a rush of current can cause the contactor to weld together without blowing any fuse (compare so called capacitor charge spot welding).
  • the object of the invention is to prevent damage to batteries and contactors in such power supply units.
  • the battery is connected to the 30 . busbar via a first contactor and to the load via a second contactor and by controlling these contactors in such a manner that the battery is discharged only to a certain extent after an AC power failure and no rushes of current appear that can weld the contactors together when the AC power failure ends.
  • 1 designates a power busbar in a power supply unit. It should be pointed out that in the embodiment shown, the busbar 1 is supposed to have negative potential.
  • two rectifiers 2 are connected with their output te ⁇ ninals to the busbar 1. It is to be understood that as an alternative, there can be just one rectifier or more than two rectifiers.
  • the input te ⁇ ninals of the rectifiers 2 are interconnected to a terminal 3 to which AC power is to be supplied, e.g. from a mains or from an AC power generator (not shown).
  • two batteries 4 are provided in the embodiment shown. It is to be understood that as an alternative, there can be just one battery or more than two batteries.
  • the busbar 1 is supposed to supply two loads 5 and 6 with power in the embodiment illustrated.
  • the load 5 is supposed to be an unprioritized load connected via fuses (not shown) to the busbar 1.
  • the unprioritized load 5 can contain capacitances.
  • the load 6 is supposed to be a prioritized capacitance-containing load.
  • prioritized load is meant a load that is more important, i.e. more important to supply with power, than an unprioritized load, such as load 5.
  • the prioritized load 6 is connected to the busbar 1 via fuses (not shown) and, on the one hand, a diode D 1 and, on the other hand, a contactor 8, diodes D2, and a contactor 7.
  • each prioritized load would be connected to the busbar 1 via respective diodes corresponding to diode Dl, and to the interconnection point between the batteries 4 and the contactor 7 via respective diodes and contactors corresponding to diodes D2 and contactor 8.
  • the contactor 7, interconnected between the batteries 4 and the busbar 1 is controlled by a control unit (not shown) to be opened when the batteries 4 have been discharged in accordance with a first parameter as detected by the control unit (not shown) to disconnect the unprioritized load 5 from the batteries 4.
  • This first parameter can be e.g. the time that has elapsed since the AC power failure occurred, the voltage to which the batteries 4 have been discharged since the AC power failure occurred, the energy that has been consumed since the AC power failure occurred or the revenue that has been generated since the AC power failure occurred or combinations thereof.
  • the contactor 8 is controlled by the control unit (not shown) to be opened after that the batteries 4 have been further discharged in accordance with a second parameter, as detected by the control unit (not shown), after that the contactor 7 has been opened.
  • That second parameter can be e.g. the time, the voltage or the energy or combinations thereof as mentioned above.
  • contactors corresponding to contactor 8 these contactors would be controlled to be opened in accordance with different parameters depending on the priorities of the respective prioritized loads.
  • the diode D 1 conducts current from the rectifiers 2 via the busbar 1 to the load 6, while the load 5 is supplied with cu ⁇ ent directly from the busbar 1.
  • the contactor 7 is controlled by the control unit (not shown) to be closed.
  • the contactor 7 After that the contactor 7 has been closed, upon fulfilment of a second condition, as detected by the control unit (not shown), e.g. that there is voltage on the busbar 1 and that a predetermined time has elapsed after closure of the contactor 7, the contactor 8 is controlled by the control unit (not shown) to be closed.
  • a second condition e.g. that there is voltage on the busbar 1 and that a predetermined time has elapsed after closure of the contactor 7, the contactor 8 is controlled by the control unit (not shown) to be closed.
  • the diodes D2 interconnected between the contactor 8 and the respective battery 4, are used to prevent charging of the batteries 4 via the contactor 8 if the contactor 8 by accident is closed before the contactor 7.

Abstract

In a power supply unit, an AC power driven rectifier (2) and an unprioritized load (5) are connected to a busbar (1). A prioritized capacitance-containing load (6) is connected to the busbar (1) via a diode (D1) and via a first contactor (7) in series with a second contactor (8). A battery (4) is connected to the busbar (1) via the first contactor (7) for supplying power to the busbar (1) upon an AC power failure until a certain discharge of the battery (4), whereupon the first contactor (7) opens to disconnect the unprioritized load (5). The prioritized load (6) receives power via the second contactor (8) until the battery (4) has been discharged further, whereupon the second contactor (8) opens. When the AC power failure ends with the contactors (7, 8) open, power is supplied to the prioritized load (6) via the diode (D1), whereupon the first and second contactors (7, 8) are closed in that order to supply power to the battery and the prioritized load (6).

Description

AN ARRANGEMENT IN A POWER SUPPLY UNIT
TECHNICAL FIELD
The invention relates generally to power supplies and more specifically to an 5 arrangement in a power supply unit for preventing damage to a battery coimected to a power busbar for supplying power to the busbar upon an AC power failure to a rectifier connected to the busbar.
BACKGROUND OF THE INVENTION
10 Upon battery operation in a power supply unit supplying a load via a busbar after an AC power failure, e.g. a mains failure, the battery has to be disconnected before it has been fully discharged in order to avoid damage to the battery. E.g. valve regulated batteries cannot be deeply discharged without being damaged.
15 The battery is normally disconnected by means of an electromechanical switch, e.g. by tripping a circuit breaker or by opening a contactor.
When the AC power failure ends and the rectifier again is to supply voltage and current to the busbar, a contactor connected to a capacitance-containing load, can be 20 damaged upon closure. This is due to the fact that capacitances, contained in the load, require a large short rush of current upon start-up. Such a rush of current can cause the contactor to weld together without blowing any fuse (compare so called capacitor charge spot welding).
25 SUMMARY OF THE INVENTION
The object of the invention is to prevent damage to batteries and contactors in such power supply units.
This is obtained in accordance with the invention in that the battery is connected to the 30. busbar via a first contactor and to the load via a second contactor and by controlling these contactors in such a manner that the battery is discharged only to a certain extent after an AC power failure and no rushes of current appear that can weld the contactors together when the AC power failure ends.
Hereby, the power supply unit according to the invention will operate smoothly.
BRIEF DESCRIPTION OF THE DRAWING
The invention will be described more in detail below with reference to the appended drawing on which the single figure illustrates an embodiment of a power supply unit with an arrangement in accordance with the invention.
DESCRIPTION OF THE INVENTION
On the drawing, 1 designates a power busbar in a power supply unit. It should be pointed out that in the embodiment shown, the busbar 1 is supposed to have negative potential.
In the embodiment shown, two rectifiers 2 are connected with their output teπninals to the busbar 1. It is to be understood that as an alternative, there can be just one rectifier or more than two rectifiers. The input teπninals of the rectifiers 2 are interconnected to a terminal 3 to which AC power is to be supplied, e.g. from a mains or from an AC power generator (not shown).
To supply power to the busbar 1 upon an AC power failure, two batteries 4 are provided in the embodiment shown. It is to be understood that as an alternative, there can be just one battery or more than two batteries.
The busbar 1 is supposed to supply two loads 5 and 6 with power in the embodiment illustrated.
The load 5 is supposed to be an unprioritized load connected via fuses (not shown) to the busbar 1. The unprioritized load 5 can contain capacitances. The load 6 is supposed to be a prioritized capacitance-containing load.
By prioritized load is meant a load that is more important, i.e. more important to supply with power, than an unprioritized load, such as load 5.
In accordance with the invention, the prioritized load 6 is connected to the busbar 1 via fuses (not shown) and, on the one hand, a diode D 1 and, on the other hand, a contactor 8, diodes D2, and a contactor 7.
It is to be understood that there can be a number of prioritized loads (not shown) having different priorities. In such a case, each prioritized load would be connected to the busbar 1 via respective diodes corresponding to diode Dl, and to the interconnection point between the batteries 4 and the contactor 7 via respective diodes and contactors corresponding to diodes D2 and contactor 8.
Upon an AC power failure, i.e. when the busbar 1 is supplied with power from the batteries 4, to extend the time that the prioritized load 6 can be supplied with power from the batteries 4, the contactor 7, interconnected between the batteries 4 and the busbar 1, is controlled by a control unit (not shown) to be opened when the batteries 4 have been discharged in accordance with a first parameter as detected by the control unit (not shown) to disconnect the unprioritized load 5 from the batteries 4.
This first parameter can be e.g. the time that has elapsed since the AC power failure occurred, the voltage to which the batteries 4 have been discharged since the AC power failure occurred, the energy that has been consumed since the AC power failure occurred or the revenue that has been generated since the AC power failure occurred or combinations thereof.
In accordance with the invention, to prevent damages to the baneries 4 after an AC power failure, the contactor 8 is controlled by the control unit (not shown) to be opened after that the batteries 4 have been further discharged in accordance with a second parameter, as detected by the control unit (not shown), after that the contactor 7 has been opened. That second parameter can be e.g. the time, the voltage or the energy or combinations thereof as mentioned above.
In case there are a plurality of contactors corresponding to contactor 8, these contactors would be controlled to be opened in accordance with different parameters depending on the priorities of the respective prioritized loads.
When the AC power failure ends and the contactors 7 and 8 are still open, i.e. in the positions illustrated in the figure, the diode D 1 conducts current from the rectifiers 2 via the busbar 1 to the load 6, while the load 5 is supplied with cuιτent directly from the busbar 1.
After that the AC power failure has ended, upon fulfilment of a first condition, as detected by the control unit (not shown), e.g. that there is voltage on the busbar 1 and that a predetermined time has elapsed, the contactor 7 is controlled by the control unit (not shown) to be closed.
Hereby, current is supplied to the batteries 4 from the rectifiers 2 via the busbar 1 and the closed contactor 7 in order to recharge the batteries 4.
After that the contactor 7 has been closed, upon fulfilment of a second condition, as detected by the control unit (not shown), e.g. that there is voltage on the busbar 1 and that a predetermined time has elapsed after closure of the contactor 7, the contactor 8 is controlled by the control unit (not shown) to be closed.
If there are a plurality of contactors corresponding to contactor 8, they will all be controlled to be closed. Hereby, power is supplied to the capacitance-containing load 6 from the rectifiers 2 via the diode D 1 and or via the busbar 1 and the closed contactors 7 and 8.
The diodes D2 interconnected between the contactor 8 and the respective battery 4, are used to prevent charging of the batteries 4 via the contactor 8 if the contactor 8 by accident is closed before the contactor 7.
As should be apparent from the above, with an arrangement in accordance with the invention, there is no risk for the batteries 4 and the contactor 8 to be damaged when an AC power failure ends.

Claims

1. An arrangement in a power supply unit comprising a power busbar ( 1) to which at least one AC power driven rectifier (2) is connected, and to which at least one battery (4) for supplying power to the busbar (1) upon an AC power failure, at least one prioritized capacitance-containing load (6), and at least one unprioritized load (5) are to be connected, characterized in that it comprises
- a first contactor (7) for connecting said at least one battery (4) to the busbar (1), s?id first contactor (7) being controlled to be opened after that said at least one battery (4) has been discharged in accordance with a first parameter after an AC power failure to disconnect said unprioritized load (5), and to be closed upon fulfilment of a first condition after that said AC power failure has ended in order to supply power to said at least one battery (4) from said at least one rectifier (2) via the busbar (1),
- a second contactor (8) for connecting said at least one battery (4) to said prioritized load (6), said second contactor (8) being controlled to be opened after that said at least one battery (4), after an AC power failure, has been further discharged in accordance with a second parameter after that said first contactor (7) has been opened, and to be closed upon fulfilment of a second condition after that the first contactor (7) has been closed in order to supply power to said prioritized load (6) from said at least one rectifier (2) via said first and second contactors (7, 8), and
- a first diode (Dl), interconnected between the busbar (1) and the connection point between the second contactor (8) and the prioritized load (6), said first diode (Dl) conducting power from said' at least one rectifier (2) to said prioritized load (6) when said AC power failure ends and said first and second contactors (7, 8) are open,
2. The arrangement as claimed in claim 1, characterized in that said at least one battery (4) is connected to said second contactor (8) via a second diode (D2) to prevent charging of said at least one battery (4) via said second contactor (8).
3. The arrangement as claimed in claim 1, characterized in that said first parameter is time, voltage, energy or revenue or combinations thereof.
4. The arrangement as claimed in claim 1, characterized in that said second parameter is time, voltage or energy or combinations thereof.
5. The arrangement as claimed in claim 1, characterized in that said first condition is that there is voltage on the busbar and that a first predetermined time has elapsed.
6. The arrangement as claimed in claim 1, characterized in that said second condition is that there is voltage on the busbar and that a second predetermined time has elapsed.
PCT/SE2000/000902 1999-05-05 2000-05-05 An arrangement in a power supply unit WO2000069045A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU47929/00A AU4792900A (en) 1999-05-05 2000-05-05 An arrangement in a power supply unit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9901629A SE9901629L (en) 1999-05-05 1999-05-05 Device in a power supply unit
SE9901629-7 1999-05-05

Publications (1)

Publication Number Publication Date
WO2000069045A1 true WO2000069045A1 (en) 2000-11-16

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Application Number Title Priority Date Filing Date
PCT/SE2000/000902 WO2000069045A1 (en) 1999-05-05 2000-05-05 An arrangement in a power supply unit

Country Status (4)

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AU (1) AU4792900A (en)
PE (1) PE20010223A1 (en)
SE (2) SE9901629L (en)
WO (1) WO2000069045A1 (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1223656A1 (en) * 2000-12-22 2002-07-17 MAN Roland Druckmaschinen AG Power supply for a rotary printing machine
WO2010027658A2 (en) * 2008-08-26 2010-03-11 Allegro Microsystems, Inc. Methods and apparatus for integrated circuit having integrated energy storage device
US9299915B2 (en) 2012-01-16 2016-03-29 Allegro Microsystems, Llc Methods and apparatus for magnetic sensor having non-conductive die paddle
US9411025B2 (en) 2013-04-26 2016-08-09 Allegro Microsystems, Llc Integrated circuit package having a split lead frame and a magnet
US9494660B2 (en) 2012-03-20 2016-11-15 Allegro Microsystems, Llc Integrated circuit package having a split lead frame
US9666788B2 (en) 2012-03-20 2017-05-30 Allegro Microsystems, Llc Integrated circuit package having a split lead frame
US9812588B2 (en) 2012-03-20 2017-11-07 Allegro Microsystems, Llc Magnetic field sensor integrated circuit with integral ferromagnetic material
US10234513B2 (en) 2012-03-20 2019-03-19 Allegro Microsystems, Llc Magnetic field sensor integrated circuit with integral ferromagnetic material
US10411498B2 (en) 2015-10-21 2019-09-10 Allegro Microsystems, Llc Apparatus and methods for extending sensor integrated circuit operation through a power disturbance
US10978897B2 (en) 2018-04-02 2021-04-13 Allegro Microsystems, Llc Systems and methods for suppressing undesirable voltage supply artifacts
US10991644B2 (en) 2019-08-22 2021-04-27 Allegro Microsystems, Llc Integrated circuit package having a low profile

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0834796A1 (en) * 1996-09-30 1998-04-08 Samsung Electronics Co., Ltd. A computer system and control method for saving power

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0834796A1 (en) * 1996-09-30 1998-04-08 Samsung Electronics Co., Ltd. A computer system and control method for saving power

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1223656A1 (en) * 2000-12-22 2002-07-17 MAN Roland Druckmaschinen AG Power supply for a rotary printing machine
US6624620B2 (en) 2000-12-22 2003-09-23 Man Roland Druckmaschinen Ag Power supply for a rotary printing machine
WO2010027658A2 (en) * 2008-08-26 2010-03-11 Allegro Microsystems, Inc. Methods and apparatus for integrated circuit having integrated energy storage device
WO2010027658A3 (en) * 2008-08-26 2010-08-05 Allegro Microsystems, Inc. Methods and apparatus for integrated circuit having integrated energy storage device
US10333055B2 (en) 2012-01-16 2019-06-25 Allegro Microsystems, Llc Methods for magnetic sensor having non-conductive die paddle
US9299915B2 (en) 2012-01-16 2016-03-29 Allegro Microsystems, Llc Methods and apparatus for magnetic sensor having non-conductive die paddle
US9620705B2 (en) 2012-01-16 2017-04-11 Allegro Microsystems, Llc Methods and apparatus for magnetic sensor having non-conductive die paddle
US9494660B2 (en) 2012-03-20 2016-11-15 Allegro Microsystems, Llc Integrated circuit package having a split lead frame
US9666788B2 (en) 2012-03-20 2017-05-30 Allegro Microsystems, Llc Integrated circuit package having a split lead frame
US9812588B2 (en) 2012-03-20 2017-11-07 Allegro Microsystems, Llc Magnetic field sensor integrated circuit with integral ferromagnetic material
US10230006B2 (en) 2012-03-20 2019-03-12 Allegro Microsystems, Llc Magnetic field sensor integrated circuit with an electromagnetic suppressor
US10234513B2 (en) 2012-03-20 2019-03-19 Allegro Microsystems, Llc Magnetic field sensor integrated circuit with integral ferromagnetic material
US11444209B2 (en) 2012-03-20 2022-09-13 Allegro Microsystems, Llc Magnetic field sensor integrated circuit with an integrated coil enclosed with a semiconductor die by a mold material
US11961920B2 (en) 2012-03-20 2024-04-16 Allegro Microsystems, Llc Integrated circuit package with magnet having a channel
US10916665B2 (en) 2012-03-20 2021-02-09 Allegro Microsystems, Llc Magnetic field sensor integrated circuit with an integrated coil
US11828819B2 (en) 2012-03-20 2023-11-28 Allegro Microsystems, Llc Magnetic field sensor integrated circuit with integral ferromagnetic material
US11677032B2 (en) 2012-03-20 2023-06-13 Allegro Microsystems, Llc Sensor integrated circuit with integrated coil and element in central region of mold material
US9411025B2 (en) 2013-04-26 2016-08-09 Allegro Microsystems, Llc Integrated circuit package having a split lead frame and a magnet
US10411498B2 (en) 2015-10-21 2019-09-10 Allegro Microsystems, Llc Apparatus and methods for extending sensor integrated circuit operation through a power disturbance
US10978897B2 (en) 2018-04-02 2021-04-13 Allegro Microsystems, Llc Systems and methods for suppressing undesirable voltage supply artifacts
US10991644B2 (en) 2019-08-22 2021-04-27 Allegro Microsystems, Llc Integrated circuit package having a low profile

Also Published As

Publication number Publication date
SE9901629D0 (en) 1999-05-05
AU4792900A (en) 2000-11-21
SE516394C2 (en) 2002-01-08
SE9901629L (en) 2000-11-06
PE20010223A1 (en) 2001-03-19

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