EP0437447B1 - A switching circuit - Google Patents
A switching circuit Download PDFInfo
- Publication number
- EP0437447B1 EP0437447B1 EP89910212A EP89910212A EP0437447B1 EP 0437447 B1 EP0437447 B1 EP 0437447B1 EP 89910212 A EP89910212 A EP 89910212A EP 89910212 A EP89910212 A EP 89910212A EP 0437447 B1 EP0437447 B1 EP 0437447B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- load
- circuit
- electromagnetic relay
- contactless switch
- time delay
- 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.)
- Revoked
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
- H01H47/18—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for introducing delay in the operation of the relay
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/541—Contacts shunted by semiconductor devices
- H01H9/542—Contacts shunted by static switch means
- H01H2009/545—Contacts shunted by static switch means comprising a parallel semiconductor switch being fired optically, e.g. using a photocoupler
Definitions
- the invention relates generally to a switching circuit for making and breaking capacitive, inductive and resistive load in an electrical circuit, as disclosed in the introductory part of Claim 1, such a circuit being known from EP-A- 0 146 809.
- Electrodes are known in various embodiments, commonly known by the term "relay”.
- Known electromagnetic relays have been available for several years, but they demand a lot of space, energy, and are besides generating electritical noise at making and breaking. Such devices also require a relatively high controlling power, and are thus precluded for a number of tasks, e.g. where the controlling is being done from a computer.
- SSR-relays Solid State Relay
- US Patent specification 4,074,333 discloses a device in which these detrimental features by far are eliminated.
- Said device operates by means of first making the load using an electronical coupling means, a bidirectionally controlled, contact less switch, whereupon a mechanical relay connects and holds the load circuit.
- the order of making and breaking is controlled by a dedicated sequence controller.
- Means are provided for controlling the triac, responsive to signals from the sequence controller through a phase detector.
- the phase detector is provided to ensure making and breaking at the point in time where the phase angel in the load circuit equals zero (zero-voltage crossing).
- a signal is fed back from the triac-controller to the sequence controller, which, through the energizing means, provide closing of the electromagnetical relay.
- a disadvantage with the device disclosed in US 4,074,333 is that it comprises a relatively complex circuit including a plurality of relatively complex circuit elements. If this circuit should be designed according to the description, using existing circuit elements, it would become unreasonably expensive. Furthermore, the device would require a relatively great amount of space, so that the device have to be large and expensive, and thus of less commercial interest.
- Present invention is in some respect based upon similar principle as the device known from said US Patent specification 4,074,333.
- the present invention is carried out using a minimum of, and simple elements, a fact which results in the circuit does require a minimum of space.
- the tolerances are not critical for the function of the circuit. All these factors contribute to a very low cost for the manufactured circuit.
- the function of this embodiment is that a control voltage 11 is applied, for controling making and breaking of the circuit. If AC voltage is to be used, it should be rectified (not shown in the figure). In the presence of the control voltage 11 a current will flow through a diode 12, a resistor 13, and a light-emitting section 14a of an optical coupler. This will in its turn provide trigging of the light-sensitive section 14b.
- the optical coupler 14a, 14b is of the kind being used to control triacs, and is in addition delaying the making until the phase angle being zero.
- Optical coupler 14b is connected to the control input of a triac 21, which is capable of making a load 22. Said load can be inductive, capacitive or pure resistive. Provision of voltage to the triac, results in connection of the load.
- the same voltage 11 starts generating an electric field in capacitor 18 through a resistor 17.
- the capacitor 18 will, together with the resistor 17, form a time-delay circuit (RC-network), which will, in a period of time determined of the selected values of the resistor 17 and capacitor 18, generate a voltage between the base of a transistor 19 and ground, so that the transistor 19 will conduct current through the control coil of a mechanical relay 20a, which shuts a switch 20b of the relay, making the load 22.
- a transistor 19 for amplifying the voltage level of the RC-network 17 and 18, the development of a high charge in the RC-network is rendered redundant, and the capacitor can consequently be of a considerably less capacity.
- control voltage is trigging triac 21, and starts charging the capacitor 18, the same control voltage also starts charging capacitor 16 through the resistor 15.
- Resistor 15 and resistor 13 are, together with capacitor 16 forming a time delay circuit. This time delay circuit is utilized in breaking the load connection.
- the RC-network formed of resistor 15, resistor 13, and capacitor 16 will provide current to optical coupler 14a, 14b in a periode of time determined by said RC-network.
- the transistor 19 will immediately be turned off, opening the electromagnetic relay 20a, 20b.
- connection to the load will be maintained by means of the triac 21 until the control voltage entirely disappears when the capacitor 16 is sufficiently discharged.
- the time constant for the RC-network fromed by 13, 15 and 16 should correspond to at least half a period of the load 22. Still, it could be larger, as it is the phase detecting optical coupler observing the breaking being exactly in zero-voltage crossing. This fact implies that a narrow tolerance of the components are not crucial, and it is possible to use inexpensive components to obtain the same result as with more accurate and expensive components.
Abstract
Description
- The invention relates generally to a switching circuit for making and breaking capacitive, inductive and resistive load in an electrical circuit, as disclosed in the introductory part of Claim 1, such a circuit being known from EP-A- 0 146 809.
- Electrical switching devices are known in various embodiments, commonly known by the term "relay". Known electromagnetic relays have been available for several years, but they demand a lot of space, energy, and are besides generating electritical noise at making and breaking. Such devices also require a relatively high controlling power, and are thus precluded for a number of tasks, e.g. where the controlling is being done from a computer.
- A different kind of electrical switching circuits are based only upon electronics, i.e. making and breaking is being effected without mechanical contacts; on the contrary, semiconductor technology is utilized. These so-called "SSR-relays" ("Solid State Relay") have great heat losses with high loads, especially with inductive loads. They thus need to be cooled, for which reason they are preclude for a number of tasks, in particular for use over a longer period of time.
- US Patent specification 4,074,333 discloses a device in which these detrimental features by far are eliminated. Said device operates by means of first making the load using an electronical coupling means, a bidirectionally controlled, contact less switch, whereupon a mechanical relay connects and holds the load circuit. The order of making and breaking is controlled by a dedicated sequence controller. Means are provided for controlling the triac, responsive to signals from the sequence controller through a phase detector. The phase detector is provided to ensure making and breaking at the point in time where the phase angel in the load circuit equals zero (zero-voltage crossing). A signal is fed back from the triac-controller to the sequence controller, which, through the energizing means, provide closing of the electromagnetical relay.
- An advantage of the device disclosed in US 4,074 333 compared to directly using an electromechanical relay, lies in the fact that arcs are avoided in making and breaking the load circuit, as said load circuit previous is made by the contactless switch. This implies utilizing the advantages from both kinds of switches, the "SSR"-technology provides a non-arc making, and the electromagnetical relay provides a permanent connection without substantial heat losses.
- A disadvantage with the device disclosed in US 4,074,333 is that it comprises a relatively complex circuit including a plurality of relatively complex circuit elements. If this circuit should be designed according to the description, using existing circuit elements, it would become unreasonably expensive. Furthermore, the device would require a relatively great amount of space, so that the device have to be large and expensive, and thus of less commercial interest.
- It is therefore a main object for the present invention to provide switching means for making and breaking various kinds of loads to any AC-circuit, especially in cases where any creation of heat or high-frequency noise in making or breaking is undesired or unacceptable, or where risks exist for explosion. Importance is attatched to providing switching means which is compact, simple, reliable and inexpensive in manufacturing. It is a more particular object to improve known switching means, in order to provide switching means being more simple, less expensive, and which require less space.
- According to the invention, this can be accomplished with a circuit as stated in the characterizing part of Claim 1. Additional favorable features are disclosed in Claims 2 to 5.
- Present invention is in some respect based upon similar principle as the device known from said US Patent specification 4,074,333. However, as opposed to this, the present invention is carried out using a minimum of, and simple elements, a fact which results in the circuit does require a minimum of space. Furthermore, the tolerances are not critical for the function of the circuit. All these factors contribute to a very low cost for the manufactured circuit.
- In the following a best mode of using the invention will be described with reference to the accompanying drawing, showing a circuit diagram of a switching circuit according to present invention.
- The function of this embodiment is that a control voltage 11 is applied, for controling making and breaking of the circuit. If AC voltage is to be used, it should be rectified (not shown in the figure). In the presence of the control voltage 11 a current will flow through a
diode 12, aresistor 13, and a light-emitting section 14a of an optical coupler. This will in its turn provide trigging of the light-sensitive section 14b. The optical coupler 14a, 14b is of the kind being used to control triacs, and is in addition delaying the making until the phase angle being zero. Optical coupler 14b is connected to the control input of atriac 21, which is capable of making aload 22. Said load can be inductive, capacitive or pure resistive. Provision of voltage to the triac, results in connection of the load. - Simoultaneously with the control voltage 11 trigging the
triac 21, the same voltage 11 starts generating an electric field incapacitor 18 through aresistor 17. Thecapacitor 18 will, together with theresistor 17, form a time-delay circuit (RC-network), which will, in a period of time determined of the selected values of theresistor 17 andcapacitor 18, generate a voltage between the base of atransistor 19 and ground, so that thetransistor 19 will conduct current through the control coil of amechanical relay 20a, which shuts a switch 20b of the relay, making theload 22. In utilizing atransistor 19 for amplifying the voltage level of the RC-network - As the control voltage is trigging
triac 21, and starts charging thecapacitor 18, the same control voltage also starts chargingcapacitor 16 through theresistor 15.Resistor 15 andresistor 13 are, together withcapacitor 16 forming a time delay circuit. This time delay circuit is utilized in breaking the load connection. - As the control voltage 11 is cut off, the RC-network formed of
resistor 15,resistor 13, andcapacitor 16, will provide current to optical coupler 14a, 14b in a periode of time determined by said RC-network. On the other hand, thetransistor 19 will immediately be turned off, opening theelectromagnetic relay 20a, 20b. However, connection to the load will be maintained by means of thetriac 21 until the control voltage entirely disappears when thecapacitor 16 is sufficiently discharged. To have thetriac 21 breaking the circuit in zero-voltage crossing, the time constant for the RC-network fromed by 13, 15 and 16, should correspond to at least half a period of theload 22. Still, it could be larger, as it is the phase detecting optical coupler observing the breaking being exactly in zero-voltage crossing. This fact implies that a narrow tolerance of the components are not crucial, and it is possible to use inexpensive components to obtain the same result as with more accurate and expensive components. - By using the optical isolator 14a, 14b to make and break the
triac 21, it is in addition obtained a galvanic separation between the control circuit 11 and theload 22.
Claims (5)
- A switching circuit for making and breaking an electrical load (22) by means of an electromagnetic relay (20a and 20b) and a parallel bidirectively controlled contact less switch (21) to which is connected an optical coupler (14a, 14b), wherein
at making, the bidirectively controlled contact less switch (21) first will connect the load (22), and after a certain period of time, the electromagnetic relay (20a) will shut; and
at breaking, the electromagnetic relay (20a) will first open, whereupon the bidirectively controlled contactless switch (21) will disconnect the load (22) in the first, or a subsequent zero-voltage crossing,
characterized in the optical coupler (14a, 14b) is a phase detecting optical coupler (14a, 14b), having an integrated zero crossing detector, wherein after activation of the light-emitting section (14a), the integrated zero-crossing detector will detect first subsequent zero crossing of the load, so that the light-sensitive section (14b) activates the bidirectively controlled contactless switch (21) at said first zero-crossing of the load. - Circuit according to claim 1,
characterized in a RC-network (17, 18) being connected in parallel to the relay coil to delay energizing of said coil. - Circuit according to claim 2,
characterized in the primary coil of the relay (20a) being connected in series with a transistor (19), which amplifies the voltage level from said RC-network (17,18). - Circuit according to claim 1,
characterized in a RC-network (13, 15, 16) being connected to delay the de-energizing. - Circuit according to claim 4,
characterized by said RC-network (13, 15, 16) has a time constant greater than, or equal to half a period of the load circuit (22).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO884150A NO168009C (en) | 1988-09-19 | 1988-09-19 | Electrical switchgear. |
NO884150 | 1988-09-19 | ||
PCT/NO1989/000095 WO1990003655A1 (en) | 1988-09-19 | 1989-09-18 | A switching circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0437447A1 EP0437447A1 (en) | 1991-07-24 |
EP0437447B1 true EP0437447B1 (en) | 1994-07-13 |
Family
ID=19891254
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89910212A Revoked EP0437447B1 (en) | 1988-09-19 | 1989-09-18 | A switching circuit |
Country Status (10)
Country | Link |
---|---|
US (1) | US5283706A (en) |
EP (1) | EP0437447B1 (en) |
JP (1) | JPH04501785A (en) |
AT (1) | ATE108572T1 (en) |
AU (1) | AU4214389A (en) |
DE (1) | DE68916804T2 (en) |
FI (1) | FI93402B (en) |
LV (1) | LV10542B (en) |
NO (1) | NO168009C (en) |
WO (1) | WO1990003655A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19803992A1 (en) * | 1998-02-02 | 1999-08-19 | Siemens Ag | Electromagnetic relay |
DE10156342B4 (en) * | 2000-11-17 | 2006-12-14 | Yazaki Corp. | Load operating arrangement and operating method for a load circuit |
CN102969201A (en) * | 2012-11-14 | 2013-03-13 | 中国船舶重工集团公司第七一九研究所 | Contact feedback type relay control system |
EP2898521B1 (en) | 2012-11-19 | 2017-06-28 | Siemens Aktiengesellschaft | Switching apparatus for controlling the energy supply to a downstream connected electrical motor |
EP2873083B1 (en) | 2012-08-30 | 2018-03-28 | Siemens Aktiengesellschaft | Switching device for controlling power supply of a subsequent electrical motor |
Families Citing this family (30)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI91115C (en) * | 1992-11-30 | 1994-05-10 | Ahlstroem Oy | Method for controlling an electrical switch and an electrical switch |
DE9301023U1 (en) * | 1993-01-26 | 1993-05-19 | Electromatic Industri A/S, Hadsten, Dk | |
US6037721A (en) * | 1996-01-11 | 2000-03-14 | Lutron Electronics, Co., Inc. | System for individual and remote control of spaced lighting fixtures |
US5637964A (en) * | 1995-03-21 | 1997-06-10 | Lutron Electronics Co., Inc. | Remote control system for individual control of spaced lighting fixtures |
US5699218A (en) * | 1996-01-02 | 1997-12-16 | Kadah; Andrew S. | Solid state/electromechanical hybrid relay |
ATE185449T1 (en) * | 1996-05-07 | 1999-10-15 | Siemens Ag | HYBRID RELAY |
US5633540A (en) * | 1996-06-25 | 1997-05-27 | Lutron Electronics Co., Inc. | Surge-resistant relay switching circuit |
FI107848B (en) * | 1996-07-25 | 2001-10-15 | Nokia Networks Oy | Coupling arrangement for reducing transients caused by an electromechanical coupling with overcurrent protection |
US5987205A (en) * | 1996-09-13 | 1999-11-16 | Lutron Electronics Co., Inc. | Infrared energy transmissive member and radiation receiver |
US5790354A (en) * | 1997-03-26 | 1998-08-04 | Watlow Electric Manufacturing Company | Hybrid power switching device |
US6046899A (en) * | 1997-08-12 | 2000-04-04 | General Electric Company | Hybrid protective relay having enhanced contact response time |
SE9704686L (en) * | 1997-12-15 | 1999-06-16 | Asea Brown Boveri | Device and method of coupling |
SE9704685L (en) | 1997-12-15 | 1999-06-16 | Asea Brown Boveri | Coupling device and method |
SE9803934D0 (en) * | 1997-12-15 | 1998-11-18 | Asea Brown Boveri | An electric switching device and a method for performing electrical disconnection of a load |
US6140715A (en) * | 1998-11-06 | 2000-10-31 | Asea Brown Boveri Ab | Electric switching device and a method for performing electric disconnection of a load |
SE9804135L (en) | 1998-11-30 | 2000-05-31 | Abb Ab | Photoconductive switch |
US6426858B1 (en) | 2000-04-12 | 2002-07-30 | Oem Products, Lc | Voltage conditioner and switching device |
US6621668B1 (en) * | 2000-06-26 | 2003-09-16 | Zytron Control Products, Inc. | Relay circuit means for controlling the application of AC power to a load using a relay with arc suppression circuitry |
US6624989B2 (en) * | 2001-05-18 | 2003-09-23 | Franklin Electric Company, Inc. | Arc suppressing circuit employing a triggerable electronic switch to protect switch contacts |
KR100434153B1 (en) * | 2002-04-12 | 2004-06-04 | 엘지산전 주식회사 | Hybrid dc electromagnetic contactor |
CN100337291C (en) * | 2002-11-20 | 2007-09-12 | 刘英彰 | Spark free on/off control circuit for contact of relay |
US7696647B2 (en) * | 2003-09-15 | 2010-04-13 | Toshiba International Corp. | Coupling node |
DE102004058018A1 (en) * | 2004-12-01 | 2006-06-22 | Siemens Ag | Control circuit for a circuit arrangement |
DE502005009632D1 (en) * | 2005-03-11 | 2010-07-08 | Gerdes Ohg | Heater |
CN201004435Y (en) * | 2006-08-25 | 2008-01-09 | 百利通电子(上海)有限公司 | AC relay |
DE102007037768A1 (en) * | 2007-08-10 | 2009-02-19 | Diehl Ako Stiftung & Co. Kg | Switching device and method for driving a consumer |
US8102130B2 (en) * | 2008-06-20 | 2012-01-24 | Light-On, Llc | Electric power distribution system using low voltage control signals |
US8089735B2 (en) * | 2008-12-01 | 2012-01-03 | Custom Sensors & Technologies, Inc. | Hybrid power relay with thermal protection |
CN101789334A (en) * | 2010-03-02 | 2010-07-28 | 罗静 | Relay zero crossing disconnection arc extinguishing method |
US8619395B2 (en) | 2010-03-12 | 2013-12-31 | Arc Suppression Technologies, Llc | Two terminal arc suppressor |
Family Cites Families (14)
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US3812382A (en) * | 1972-03-03 | 1974-05-21 | Grigsby Barton Inc | Synchronous switching circuit |
DE2421558A1 (en) * | 1974-05-03 | 1975-11-13 | Standard Elektrik Lorenz Ag | RELAY SWITCHING, IN PARTICULAR FOR REMOTE INDICATION SYSTEMS |
JPS5162971A (en) * | 1974-11-29 | 1976-05-31 | Omron Tateisi Electronics Co | |
DE2613929C3 (en) * | 1976-03-31 | 1980-01-24 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Circuit arrangement with a relay which has a normally open contact |
US4074333A (en) * | 1976-07-15 | 1978-02-14 | Shinko Electric Company, Ltd. | A.c. relay system |
JPS5614723A (en) * | 1979-07-17 | 1981-02-13 | Fuji Electric Co Ltd | Zero-cross type solid switch using photothyristor |
US4525762A (en) * | 1983-10-07 | 1985-06-25 | Norris Claude R | Arc suppression device and method |
JPS60117518A (en) * | 1983-11-28 | 1985-06-25 | オムロン株式会社 | Relay unit |
KR900000310B1 (en) * | 1985-02-20 | 1990-01-25 | Takamisawa Electric Co | Hybrid relay circuit having electromagnetic relay for switching ac power supply |
JPS62290350A (en) * | 1986-06-10 | 1987-12-17 | Mitsubishi Electric Corp | Power control device |
US4745511A (en) * | 1986-10-01 | 1988-05-17 | The Bf Goodrich Company | Means for arc suppression in relay contacts |
DE3701588A1 (en) * | 1987-01-21 | 1988-08-04 | Diehl Gmbh & Co | SWITCHING DEVICE FOR AN INDUCTIVE LOAD |
US4751401A (en) * | 1987-03-23 | 1988-06-14 | Core Industries Inc. | Low voltage switch |
EP0332855A3 (en) * | 1988-03-16 | 1991-03-13 | OMRON Corporation | Improved hybrid relay |
-
1988
- 1988-09-19 NO NO884150A patent/NO168009C/en not_active IP Right Cessation
-
1989
- 1989-09-18 AU AU42143/89A patent/AU4214389A/en not_active Abandoned
- 1989-09-18 AT AT89910212T patent/ATE108572T1/en not_active IP Right Cessation
- 1989-09-18 WO PCT/NO1989/000095 patent/WO1990003655A1/en not_active Application Discontinuation
- 1989-09-18 EP EP89910212A patent/EP0437447B1/en not_active Revoked
- 1989-09-18 JP JP1509517A patent/JPH04501785A/en active Pending
- 1989-09-18 DE DE68916804T patent/DE68916804T2/en not_active Expired - Lifetime
-
1991
- 1991-03-11 FI FI911187A patent/FI93402B/en active
- 1991-03-19 US US07/671,519 patent/US5283706A/en not_active Expired - Lifetime
-
1992
- 1992-12-29 LV LVP-92-540A patent/LV10542B/en unknown
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19803992A1 (en) * | 1998-02-02 | 1999-08-19 | Siemens Ag | Electromagnetic relay |
DE19803992C2 (en) * | 1998-02-02 | 1999-12-02 | Siemens Ag | Electromagnetic relay |
DE10156342B4 (en) * | 2000-11-17 | 2006-12-14 | Yazaki Corp. | Load operating arrangement and operating method for a load circuit |
EP2873083B1 (en) | 2012-08-30 | 2018-03-28 | Siemens Aktiengesellschaft | Switching device for controlling power supply of a subsequent electrical motor |
CN102969201A (en) * | 2012-11-14 | 2013-03-13 | 中国船舶重工集团公司第七一九研究所 | Contact feedback type relay control system |
EP2898521B1 (en) | 2012-11-19 | 2017-06-28 | Siemens Aktiengesellschaft | Switching apparatus for controlling the energy supply to a downstream connected electrical motor |
Also Published As
Publication number | Publication date |
---|---|
FI93402B (en) | 1994-12-15 |
EP0437447A1 (en) | 1991-07-24 |
WO1990003655A1 (en) | 1990-04-05 |
FI911187A0 (en) | 1991-03-11 |
ATE108572T1 (en) | 1994-07-15 |
NO884150D0 (en) | 1988-09-19 |
NO168009B (en) | 1991-09-23 |
AU4214389A (en) | 1990-04-18 |
US5283706A (en) | 1994-02-01 |
LV10542A (en) | 1995-02-20 |
JPH04501785A (en) | 1992-03-26 |
NO884150L (en) | 1990-03-20 |
LV10542B (en) | 1995-06-20 |
NO168009C (en) | 1994-06-21 |
DE68916804T2 (en) | 1995-02-23 |
DE68916804D1 (en) | 1994-08-18 |
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