EP0771518B1 - Electrical power control system - Google Patents
Electrical power control system Download PDFInfo
- Publication number
- EP0771518B1 EP0771518B1 EP95925944A EP95925944A EP0771518B1 EP 0771518 B1 EP0771518 B1 EP 0771518B1 EP 95925944 A EP95925944 A EP 95925944A EP 95925944 A EP95925944 A EP 95925944A EP 0771518 B1 EP0771518 B1 EP 0771518B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- terminal
- monitoring
- voltage
- switching means
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/40—Controlling the intensity of light discontinuously
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Eletrric Generators (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Relay Circuits (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Keying Circuit Devices (AREA)
- Radio Relay Systems (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Control Of Electrical Variables (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
Description
Claims (17)
- A method of controlling an electrical power system for providing one of a plurality of selected voltages to a load, the method comprising the steps of:-(a) electrically connecting one end of a winding (3) to the positive terminal (L) of a source of electrical power, the winding being tapped at a predetermined position (18) for supplying an output terminal (T) with a selected voltage;(b) enabling a terminal connection means (200A) to electrically connect the other end (14) of said winding to a neutral terminal (N) of said source of electrical power in response to supply of power being required;(c) excluding a predetermined number of turns of said winding in response to a request for another selected voltage;(d) monitoring for at least one type of fault condition; and(e) electrically disconnecting the winding from the neutral terminal and electrically short-circuiting said other end of the winding to said predetermined position when a fault condition is monitored.
- A method according to claim 1 wherein step (c) comprises disabling the terminal connection means to electrically disconnect said other end of said winding from the neutral terminal and enabling a switching means (100A) to electrically connect to the neutral terminal to exclude a predetermined number of turns of said winding from said other end of the winding.
- A method according to claim 2 wherein step (e) comprises disabling said terminal connection means and said switching means and enabling a further switching means (300A) to electrically short-circuit said other end of said winding to said predetermined position.
- A method according to any preceding claim further comprising the step of monitoring for an increased load demand and stopping step (c) in response to a predetermined load demand.
- A method according to any preceding claim further comprising the step of monitoring the voltage to said one end of the winding and stopping step (c) in response to the voltage falling below a predetermined value.
- A method according to any preceding claim further comprising the step of supplying said request for another selected voltage after the lapse of a predetermined time interval following supply of power being required.
- An electrical power control system for providing one of a plurality of selected voltages to a load, the electrical power control system comprising:-a positive and neutral terminal (L,N) for connection to a source of electrical power;an output terminal (T) for supplying a plurality of selected voltages;a winding (3) having one end (13) electrically connected to the positive terminal and being tapped at a predetermined position (18) for supplying the output terminal (T) with a selected voltage characterized by;a terminal connection means (200A) capable of being enabled to electrically connect the other end (14) of the winding to the neutral terminal;a switching means (100A) capable of being enabled to exclude a predetermined number of turns of said winding in response to a request for another selected voltage;monitoring means for monitoring at least one type of fault condition; andfurther switching means (300A) capable of being enabled to electrically short-circuit said other end of the winding to said predetermined position when a fault condition is monitored.
- A system according to claim 7 wherein said switching means (100A) is connected to the neutral terminal (N) to exclude the predetermined number of turns of said winding from said other end of the winding.
- A system according to claim 8 wherein in response to monitoring of a fault condition, said monitoring means disables said terminal connection means (200A) and said switching means (100A) to electrically disconnect said other end of the winding from the neutral terminal and enables said further switching means (300A).
- A system according to any one of claims 7 to 9 wherein said monitoring means further comprises a current demand sensing means (21) for sensing for transient current changes in the current demand by the load; wherein said monitoring means disables said switching means in response to transient changes in current above a predetermined level.
- A system according to any one of claims 7 to 10 wherein said monitoring means further comprises a current overload monitoring means for monitoring current to the winding; wherein said monitoring means disables said terminal connection means and said switching means to electrically disconnect said other end of the winding from the neutral terminal and enables said further switching means in response to a monitored current above a predetermined maximum level.
- A system according to any one of claims 7 to 11 wherein said monitoring means further comprises a voltage monitoring means (30) for monitoring voltage to said one end of the winding; and wherein said monitoring means disables said switching means in response to a voltage below a predetermined minimum.
- A system according to any one of claims 7 to 12 wherein said monitoring means further comprises timer means (25,31) for measuring the time starting from a supply of said a selected voltage; wherein said monitoring means enables said switching means when said measured time exceeds a predetermined time interval.
- A system according in claim 12 and 13 wherein said timer means monitors a further time starting from supply of said selected voltage; wherein said monitoring means enables said switching means only when said further time exceeds a further predetermined time interval during which the voltage to said one end of said winding has not fallen below said predetermined minimum.
- A system according to claim 13 or 14 wherein said timer means is reset whenever the switching means is disabled or said further switching means is enabled.
- A system according to any one of claims 7 to 15 wherein the terminal connection means, the switching means and the further switching means comprise relay contacts.
- A system according to 16 as dependent on any one of claims 10 to 15 further comprising a zero crossing detector so that movement of the relay contacts can take place at optimum points during the cycle.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9414665 | 1994-07-20 | ||
GB9414665A GB9414665D0 (en) | 1994-07-20 | 1994-07-20 | Improvements in and relating to control systems for electrical circuits |
GB9504282 | 1995-03-03 | ||
GBGB9504282.6A GB9504282D0 (en) | 1994-07-20 | 1995-03-03 | Improvements in and relating to control systems for electrical circuits |
PCT/GB1995/001729 WO1996003018A1 (en) | 1994-07-20 | 1995-07-20 | Electrical power control system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0771518A1 EP0771518A1 (en) | 1997-05-07 |
EP0771518B1 true EP0771518B1 (en) | 1999-01-20 |
Family
ID=26305306
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95925944A Expired - Lifetime EP0771518B1 (en) | 1994-07-20 | 1995-07-20 | Electrical power control system |
Country Status (13)
Country | Link |
---|---|
EP (1) | EP0771518B1 (en) |
JP (1) | JP3746295B2 (en) |
CN (1) | CN1087585C (en) |
AT (1) | ATE176118T1 (en) |
AU (1) | AU700796B2 (en) |
BR (1) | BR9508791A (en) |
CA (1) | CA2226498C (en) |
DE (1) | DE69507484T2 (en) |
ES (1) | ES2129838T3 (en) |
GB (1) | GB2307119B (en) |
HK (1) | HK1011517A1 (en) |
NZ (1) | NZ289906A (en) |
WO (1) | WO1996003018A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9081039B2 (en) | 2012-05-17 | 2015-07-14 | GM Global Technology Operations LLC | Vehicle electrical system fault detection |
FR3070225B1 (en) * | 2017-08-16 | 2019-09-20 | Aksor | AUTOMATIC TERMINAL |
EP3975362A1 (en) * | 2020-09-24 | 2022-03-30 | Volvo Truck Corporation | Safety circuit for a power system of a vehicle and method for controlling the safety circuit |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4189664A (en) * | 1977-10-05 | 1980-02-19 | Hirschfeld Richard L | Power control unit for automatic control of power consumption in a lighting load |
US4201938A (en) * | 1978-10-02 | 1980-05-06 | Siemens-Allis, Inc. | Voltage regulator which eliminates arcing during tap changes |
US4237403A (en) * | 1979-04-16 | 1980-12-02 | Berkleonics, Inc. | Power supply for fluorescent lamp |
US4513224A (en) * | 1982-09-22 | 1985-04-23 | Pacific Power Control, Inc. | Fluorescent-lighting-system voltage controller |
-
1995
- 1995-07-20 AU AU29884/95A patent/AU700796B2/en not_active Ceased
- 1995-07-20 BR BR9508791A patent/BR9508791A/en not_active IP Right Cessation
- 1995-07-20 CN CN95194706A patent/CN1087585C/en not_active Expired - Fee Related
- 1995-07-20 AT AT95925944T patent/ATE176118T1/en not_active IP Right Cessation
- 1995-07-20 JP JP50484196A patent/JP3746295B2/en not_active Expired - Fee Related
- 1995-07-20 CA CA002226498A patent/CA2226498C/en not_active Expired - Fee Related
- 1995-07-20 NZ NZ289906A patent/NZ289906A/en unknown
- 1995-07-20 ES ES95925944T patent/ES2129838T3/en not_active Expired - Lifetime
- 1995-07-20 EP EP95925944A patent/EP0771518B1/en not_active Expired - Lifetime
- 1995-07-20 GB GB9703695A patent/GB2307119B/en not_active Revoked
- 1995-07-20 WO PCT/GB1995/001729 patent/WO1996003018A1/en active IP Right Grant
- 1995-07-20 DE DE69507484T patent/DE69507484T2/en not_active Expired - Fee Related
-
1998
- 1998-11-14 HK HK98112015A patent/HK1011517A1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
MX9700481A (en) | 1998-10-31 |
BR9508791A (en) | 1997-12-30 |
CN1155967A (en) | 1997-07-30 |
EP0771518A1 (en) | 1997-05-07 |
WO1996003018A1 (en) | 1996-02-01 |
ES2129838T3 (en) | 1999-06-16 |
GB2307119B (en) | 1998-05-27 |
ATE176118T1 (en) | 1999-02-15 |
CA2226498C (en) | 2003-02-18 |
NZ289906A (en) | 1998-10-28 |
JP3746295B2 (en) | 2006-02-15 |
GB9703695D0 (en) | 1997-04-09 |
GB2307119A (en) | 1997-05-14 |
JPH10504122A (en) | 1998-04-14 |
DE69507484T2 (en) | 1999-09-02 |
CA2226498A1 (en) | 1996-02-01 |
DE69507484D1 (en) | 1999-03-04 |
AU700796B2 (en) | 1999-01-14 |
HK1011517A1 (en) | 1999-07-09 |
CN1087585C (en) | 2002-07-10 |
AU2988495A (en) | 1996-02-16 |
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