WO1983002860A1 - Method of securely interrupting the electric power supply from a low-frequency or direct voltage source to a load, and apparatus for carrying out the method - Google Patents

Method of securely interrupting the electric power supply from a low-frequency or direct voltage source to a load, and apparatus for carrying out the method Download PDF

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Publication number
WO1983002860A1
WO1983002860A1 PCT/SE1983/000023 SE8300023W WO8302860A1 WO 1983002860 A1 WO1983002860 A1 WO 1983002860A1 SE 8300023 W SE8300023 W SE 8300023W WO 8302860 A1 WO8302860 A1 WO 8302860A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
frequency
load
source
low
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.)
Ceased
Application number
PCT/SE1983/000023
Other languages
French (fr)
Inventor
L M Ericsson Telefonaktiebolaget
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KEMSTEDT Clas Ake
Telefonaktiebolaget LM Ericsson AB
Original Assignee
KEMSTEDT Clas Ake
Telefonaktiebolaget LM Ericsson 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 KEMSTEDT Clas Ake, Telefonaktiebolaget LM Ericsson AB filed Critical KEMSTEDT Clas Ake
Priority to AT83900504T priority Critical patent/ATE45253T1/en
Priority to DE8383900504T priority patent/DE3380335D1/en
Publication of WO1983002860A1 publication Critical patent/WO1983002860A1/en
Priority to FI833382A priority patent/FI81930C/en
Priority to NO833609A priority patent/NO165090C/en
Priority to DK458083A priority patent/DK159230C/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/2173—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L5/00—Local operating mechanisms for points or track-mounted scotch-blocks; Visible or audible signals; Local operating mechanisms for visible or audible signals
    • B61L5/12—Visible signals
    • B61L5/18—Light signals; Mechanisms associated therewith, e.g. blinders
    • B61L5/1809—Daylight signals
    • B61L5/1881—Wiring diagrams for power supply, control or testing
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/097—Supervising of traffic control systems, e.g. by giving an alarm if two crossing streets have green light simultaneously
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the present invention relates to a method for secure interruption of the supply of electric power from a low-frequency or direct voltage source to a load, and an apparatus for carrying out the method.
  • the object of the present invention is to eliminate the disadvantages associated with relays in this connection.
  • Figure 1 is a circuit diagram of an embodiment of the inventive apparatus
  • Figures 2a-2k illustrate the voltages at different points in the diagram of Figure 1.
  • FIG. 1 is a circuit diagram of an embodiment of an apparatus for securely interrupting the supply of electric power from a low-frequency source 1 to a load 2.
  • this load is assumed to be a railway signalling lamp which when it is alight announces passage permission to a train.
  • a direct voltage source may of course be used instead of the low-frequency source 1.
  • the output voltage a of the low-frequency source 1 is applied to a chopper device 4, adapted for chopping the low-fre ⁇ quency voltage a, the appearance of which will be seen from Figure 2a, to a high-frequency alternating voltage in response to a high-frequency signal b, the appearance of which will be seen from Figure 2b, and which is supplied to the chopper device 4 from a signal source 3.
  • the high-frequency input signal b to the chopper device 4 may be Interrupted, as indicated in Figure 1 by a break-contact 39.
  • the high-frequency alternating voltage generated by the chopper device 4, having the appearance illustrated in Figures 2e and 2f, is applied to an interface with the property of only being able to transfer high-frequency energy.
  • this interface comprises two transformers 5 and 6, having primary windings 7 and 8, respectively.
  • the respective secondary windings 9 and 10 of these transformers are connected to a rectifying and filtering device 11, for rectifying and filtering the high-fre ⁇ quency alternating voltages on the secondary sides of the transformers 5 and 6 to form a voltage k, the appearance of which will be seen from Figure 2k, and which is applied to the signal lamp 2.
  • the illustrated apparatus is implemented such that the voltage k to the signal lamp 2 is securely interrupted when the voltage b from the signal source 3 is interrupted.
  • One output terminal on the low-frequency source 1 is connected via a conductor 12 to the centre tap of the primary winding 7 of the transformer 5, this tap being in turn connected by a conductor 13 to the centre tap of the primary winding 8 of the transformer 6.
  • the other output terminal of the source 1 is connected via a conductor 14 to:
  • connection point between the cathodes of diodes 15 and 16 is connected to the collector of a field effect transistor 23, the emitter of which is connected to the connection point between the anodes of diodes 21 and 22, and the gate of which is connected to one end of a first secondary winding 25 of a transformer 24, the other end of said winding being connected to the emitter of the transistor 23.
  • connection point between the cathodes of diodes 17 and 18 is connected to the collector of a field effect transistor 26, the emitter of which is connected to the connection point between the anode of diodes 19 and 20 and also to one end of a second secondary winding 27 of the transformer 24, the other end of said winding being connected to the gate of the transistor 26.
  • the primary winding 28 of the transformer 24 is connected via the break-co ⁇ - tact 39 between the two output terminals of the voltage source 3.
  • One end of the secondary winding 9 of the transformer 5 is connected to the anode of a diode 29, the cathode thereof being connected to the cathode of a diode 30, the anode of this diode being connected to the other end of the winding 9.
  • the connection point between the cathodes of diodes 29 and 30 is connected to one end of a coil 31, the other end of which is connected to a) one terminal of a capacitor 32, the other terminal thereof being connected to the centre tap of the secondary winding 9 of the transformer 5 and
  • One end of the secondary winding 10 of the transformer 6 is connected to the anode of a diode 34, the cathode thereof being connected to the cathode of a diode 35, the anode of this diode being connected to the other end of the secondary winding 10.
  • connection point between the cathodes of diodes 34 and 35 is connected to one end of a coil 36, and the other end of this coil is connected to a) one terminal of a capacitor 37, having its other terminal connected to the centre tap of the secondary winding 10 of the transformer 6, and b) the gate of a field effect transistor 38, having its emitter also connected to the centre tap of the secondary winding 10, and its collector connected to the gate of the transistor 33, the collector of which is in turn connected to the gate of the transistor 38.
  • the voltage across the primary winding 7 of the transformer 5 will have the appearance shown in Figure 2 ⁇ , while the voltage between the connection point of the diodes 29 and 30 and the centre tap on the secondary winding 9 of the transformer 5 will have the appearance shown in Figure 29.
  • the emitter-gate voltage of the transistor 33 will have the appearance shown in Figure 2i while the emitter-gate voltage of the transistor 38 will have the appearance shown in Figure 2j.
  • the voltages from the secondary windings of the transformers 5 and 6 are rectified by the diodes 29, 30 and 34, 35, respectively, while the high-frequency components from chopping by the chopper device 4 are filtered out by the filters comprising coil 31 and capacitor 32 and coil 36 and capacitor 37, respectively.
  • the purpose of the field effect transistors 33 and 38 is to prevent one rectifier from conducting current to the load 2 when the other transformer supplies voltage, and vice versa, since both rectifiers would otherwise constitute short circuits for each other, in respect of the output voltage of the apparatus.
  • the field effect transistors 33 and 38 may of course be replaced, either by bipolar-type transistors or by thyristors. This also applies to the field effect transistors 23 and 26 in the chopper device 4.
  • OMPI and 6 are mutually, galvanically isolated by an isolation of a high isolation class, the probability of leakage voltage is so small that it may be neglected.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dc-Dc Converters (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Train Traffic Observation, Control, And Security (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Stand-By Power Supply Arrangements (AREA)
  • Inverter Devices (AREA)

Abstract

Procédé et dispositif d'interruption sûre de l'alimentation électrique à partir par exemple d'une source à basse fréquence (1) d'une lampe de signalisation (2) qui signale, lorsqu'elle est allumée, la permission de passer pour un train. La tension de sortie (a) de la source (1) est échantillonnée par un dispositif d'échantillonnage (4) de manière à obtenir une tension alternative à haute fréquence (e, f) en réponse à un signal d'entrée à haute fréquence (b) envoyé au dispositif d'échantillonnage et elle est transférée du côté primaire au côté secondaire d'un transformateur (5, 6) en même temps qu'elle est redressée et filtrée pour former une tension (k) appliquée à la lampe de signalisation (2), cette tension (k) possédant une forme d'onde correspondant à la forme d'onde de la tension de sortie (a) de la source (1) et qui est interrompue d'une manière sûre en interrompant le signal d'entrée (b) envoyé au dispositif d'échantillonnage (4).Method and device for safe interruption of the electrical supply from, for example, a low frequency source (1) of a signaling lamp (2) which signals, when it is on, the permission to pass for a train. The output voltage (a) of the source (1) is sampled by a sampling device (4) so as to obtain a high frequency alternating voltage (e, f) in response to a high frequency input signal (b) sent to the sampling device and it is transferred from the primary side to the secondary side of a transformer (5, 6) at the same time as it is rectified and filtered to form a voltage (k) applied to the lamp. signaling (2), this voltage (k) having a waveform corresponding to the waveform of the output voltage (a) of the source (1) and which is safely interrupted by interrupting the signal input (b) sent to the sampling device (4).

Description

METHOD OF SECURELY INTERRUPTING THE ELECTRIC POWER SUPPLY FROM A LOW-FREQUENCY OR DIRECT VOLTAGE SOURCE TO A LOAD, AND APPARATUS FOR CARRYING OUT THE METHOD
TECHNICAL FIELD
The present invention relates to a method for secure interruption of the supply of electric power from a low-frequency or direct voltage source to a load, and an apparatus for carrying out the method.
BACKGROUND ART
In railway signalling technology, the secure interruption of electric power to a load is of the greatest importance, the load being e g a signal lamp which, when illuminated, announces "permission to pass" for a train. Relays have so far been used in the art to achieve this interruption. However, relays are burdened with the disadvantages that they are voluminous, heavy, expensive to manufacture, environmentally sensitive and that they have limited working life with respect to the number of interruptions.
DISCLOSURE OF INVENTION
The object of the present invention is to eliminate the disadvantages associated with relays in this connection.
This object has been achieved by the method and apparatus in accordance with the invention having been given the characterizing features disclosed in the claims.
BRIEF DESCRIPTION OF DRAWINGS
The invention will now be described in detail below, with reference to the accompanying' drawing, whereon Figure 1 is a circuit diagram of an embodiment of the inventive apparatus, and Figures 2a-2k illustrate the voltages at different points in the diagram of Figure 1. MODE FOR CARRYING OUT THE INVENTION
Figure 1 is a circuit diagram of an embodiment of an apparatus for securely interrupting the supply of electric power from a low-frequency source 1 to a load 2. In the illustrated embodiment this load is assumed to be a railway signalling lamp which when it is alight announces passage permission to a train. A direct voltage source may of course be used instead of the low-frequency source 1.
In accordance with the invention, the output voltage a of the low-frequency source 1 is applied to a chopper device 4, adapted for chopping the low-fre¬ quency voltage a, the appearance of which will be seen from Figure 2a, to a high-frequency alternating voltage in response to a high-frequency signal b, the appearance of which will be seen from Figure 2b, and which is supplied to the chopper device 4 from a signal source 3. The high-frequency input signal b to the chopper device 4 may be Interrupted, as indicated in Figure 1 by a break-contact 39. The high-frequency alternating voltage generated by the chopper device 4, having the appearance illustrated in Figures 2e and 2f, is applied to an interface with the property of only being able to transfer high-frequency energy. In the embodiment illustrated, this interface comprises two transformers 5 and 6, having primary windings 7 and 8, respectively. The respective secondary windings 9 and 10 of these transformers are connected to a rectifying and filtering device 11, for rectifying and filtering the high-fre¬ quency alternating voltages on the secondary sides of the transformers 5 and 6 to form a voltage k, the appearance of which will be seen from Figure 2k, and which is applied to the signal lamp 2.
The illustrated apparatus is implemented such that the voltage k to the signal lamp 2 is securely interrupted when the voltage b from the signal source 3 is interrupted.
One output terminal on the low-frequency source 1 is connected via a conductor 12 to the centre tap of the primary winding 7 of the transformer 5, this tap being in turn connected by a conductor 13 to the centre tap of the primary winding 8 of the transformer 6. The other output terminal of the source 1 is connected via a conductor 14 to:
OMFI a) the anode of a diode 15, the cathode thereof being connected to the cathode of a diode 16, the anode of this diode being connected to one end of the primary winding 7 of the transformer 5, b) the anode of a diode 17, the cathode thereof being connected to the cathode of a diode 18, the anode of this diode being connected to the other end of the primary winding 7 of the transformer 5, c) the cathode of a diode 19, the anode thereof being connected to the anode of a diode 20, the cathode of this diode being connected to one end of the primary winding 8 of the transformer 6, and d) the cathod of a diode 21, the anode thereof being connected to the anode of a diode 22, the cathode of this diode being connected to the other end of the primary winding 8 of the transformer 6.
The connection point between the cathodes of diodes 15 and 16 is connected to the collector of a field effect transistor 23, the emitter of which is connected to the connection point between the anodes of diodes 21 and 22, and the gate of which is connected to one end of a first secondary winding 25 of a transformer 24, the other end of said winding being connected to the emitter of the transistor 23.
The connection point between the cathodes of diodes 17 and 18 is connected to the collector of a field effect transistor 26, the emitter of which is connected to the connection point between the anode of diodes 19 and 20 and also to one end of a second secondary winding 27 of the transformer 24, the other end of said winding being connected to the gate of the transistor 26.
The primary winding 28 of the transformer 24 is connected via the break-coπ- tact 39 between the two output terminals of the voltage source 3.
One end of the secondary winding 9 of the transformer 5 is connected to the anode of a diode 29, the cathode thereof being connected to the cathode of a diode 30, the anode of this diode being connected to the other end of the winding 9. The connection point between the cathodes of diodes 29 and 30 is connected to one end of a coil 31, the other end of which is connected to a) one terminal of a capacitor 32, the other terminal thereof being connected to the centre tap of the secondary winding 9 of the transformer 5 and
O b) the gate of a field effect transistor 33, having its emitter also connected to the centre tap of the secondary winding 9 and its collector connected to one terminal of the signalling lamp 2, the other terminal of which is connected to the gate of the field effect transistor 33.
One end of the secondary winding 10 of the transformer 6 is connected to the anode of a diode 34, the cathode thereof being connected to the cathode of a diode 35, the anode of this diode being connected to the other end of the secondary winding 10. The connection point between the cathodes of diodes 34 and 35 is connected to one end of a coil 36, and the other end of this coil is connected to a) one terminal of a capacitor 37, having its other terminal connected to the centre tap of the secondary winding 10 of the transformer 6, and b) the gate of a field effect transistor 38, having its emitter also connected to the centre tap of the secondary winding 10, and its collector connected to the gate of the transistor 33, the collector of which is in turn connected to the gate of the transistor 38.
When the voltages according to Figures 2a and 2b appear at the respective outputs of the low-frequency source 1 and the voltage source 3, the emitter- collector voltage of the field effect transistor 23 will have the appearance shown in Figure 2c, while the emitter-collector voltage of the field effect transistor 26 will have the appearance shown in Figure 2d.
The voltage across the primary winding 7 of the transformer 5 will have the appearance shown in Figure 2ε, while the voltage between the connection point of the diodes 29 and 30 and the centre tap on the secondary winding 9 of the transformer 5 will have the appearance shown in Figure 29.
The voltage across the primary winding 8 of the transformer 6 will have the ' appearance shown in Figure 2f while the voltage between the connection point of diodes 34 and 35 and the centre tap on the secondary winding 10 of the transformer 6 will have the appearance shown in Figure 24.
0The voltages from the secondary windings of the transformers 5 and 6 are rectified with the aid of diodes 29, 30 and 34, 35, respectively, while the high-frequency components from the chopper device 2 are filtered out by the filters comprising coil 31 and capacitor 32 and coil 36 and capacitor 37, respectively.
After filtering, the emitter-gate voltage of the transistor 33 will have the appearance shown in Figure 2i while the emitter-gate voltage of the transistor 38 will have the appearance shown in Figure 2j. This results in that the voltage k across the signal lamp 2 will have the appearance shown in Figure 2k. The voltages from the secondary windings of the transformers 5 and 6 are rectified by the diodes 29, 30 and 34, 35, respectively, while the high-frequency components from chopping by the chopper device 4 are filtered out by the filters comprising coil 31 and capacitor 32 and coil 36 and capacitor 37, respectively.
The purpose of the field effect transistors 33 and 38 is to prevent one rectifier from conducting current to the load 2 when the other transformer supplies voltage, and vice versa, since both rectifiers would otherwise constitute short circuits for each other, in respect of the output voltage of the apparatus.
The field effect transistors 33 and 38 may of course be replaced, either by bipolar-type transistors or by thyristors. This also applies to the field effect transistors 23 and 26 in the chopper device 4.
There will thus be no power supplied to the signal lamp 2, when the high-frequency input signal b is interrupted, since no voltage is obtained across the respective primary windings 7 and 8 of the transformers 5 and 6. The interruption of power will thus be secure within the meaning implied in railway signalling technology, since no component failure can give rise to the high-fre- quency control signal which provides the chopping necessary for the output voltage a of the low-frequency source 1 to be transferred to the secondary side of the transformers 5 and 6. These transformers 5 and 6 are further implement¬ ed such that they can only transfer high-frequency energy. Accordingly, such component failures will be harmless as could cause the voltage from the low frequency source 1 to be directly applied to the primary windings, since the transformers become saturated when low-frequency voltage is applied to their primary windings. Since the primary and secondary sides of the transformers 5
OMPI and 6 are mutually, galvanically isolated by an isolation of a high isolation class, the probability of leakage voltage is so small that it may be neglected.
In accordance with the invention there has thus been provided a method and apparatus for the secure interruption of the supply of power from a low-fre- quency or direct voltage source to a load.
OM

Claims

1 Method for secure interruption of the supply of electric power from a low-frequency or direct voltage source (1) to a load (2), characterized in that the output voltage (a) of the source (1) is chopped to a high-frequency alternating voltage (e, f) in response to a high-frequency signal (b),
that the high-frequency alternating, voltage (e, f) is transferred from one side to the other of an interface (5, 6) having galvanic isolation and intended for transmission of high-frequency alternating voltages only,
that the high-frequency alternating voltage on the other side of the interface is rectified and filtered to form a voltage (k) supplied to the load (2), the wave form of said voltage corresponding to that of the output voltage (a) of the source (1),' and
that the voltage (k) supplied to the load (2) is interrupted by interrupting the high-frequency signal (b).
2 Apparatus for secure interruption of the supply of electric power from a low-frequency or direct voltage source (1) to a load (2), characterized in that a chopper device (4) is adapted to chop the output voltage (a) of the source (1) to a high-frequency alternating voltage (e, f) in response to a high-frequency input signal (b) to the chopper device (4), that there is an interface (5, 6) having galvanic isolation and intended for transmission of high-frequency alternating voltages only for transferring the high-frequency alternating voltage (e, f) from one side to the other of the interface, that a rectifying and filtering device (29, 30, 31, 32, 34, 35, 36, 37) is disposed for rectifying and filtering the high-frequency alternating voltage on the other side of the interface for forming a voltage (k) which is applied to the load (2) and which has a wave form corresponding to that of the output voltage (a) of the source (1), and that there are means (39) for interrupting the high-frequency input signal (b) to the chopper device (4) for interrupting the voltage (k) supplied to the load (2).
3 Apparatus as claimed in claim 2, characterized in that the interface (5, 6) comprises a transformer, the primary side (7, 8) of which constitutes said one side, and the secondary side (9, 10) of which constitutes said other side.
OMFI
PCT/SE1983/000023 1982-02-05 1983-01-26 Method of securely interrupting the electric power supply from a low-frequency or direct voltage source to a load, and apparatus for carrying out the method Ceased WO1983002860A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AT83900504T ATE45253T1 (en) 1982-02-05 1983-01-26 SYSTEM FOR SECURELY DISCONNECTING THE POWER SUPPLY OF A CONSUMER FROM A LOW FREQUENCY OR DC VOLTAGE SOURCE.
DE8383900504T DE3380335D1 (en) 1982-02-05 1983-01-26 Apparatus for securely interrupting the electric power supply from a low-frequency or direct voltage source to a load
FI833382A FI81930C (en) 1982-02-05 1983-09-21 SAETT ATT MED SAEKERHET BRYTA MATNINGEN AV ELEKTRISK EFFEKT FRAON EN LAOGFREKVENS- ELLER LIKSPAENNINGSKAELLA TILL EN BELASTNING JAEMTE ANORDNING FOER UTFOERANDE AV SAETTET.
NO833609A NO165090C (en) 1982-02-05 1983-10-04 DEVICE FOR SAFE INTERRUPTION OF THE ELECTRIC POWER SUPPLY FROM A LOW-FREQUENCY BIPOLAR POWER SOURCE TO A LOAD.
DK458083A DK159230C (en) 1982-02-05 1983-10-04 PROCEDURE FOR CERTAINLY DISCONNECTING THE POWER OF ELECTRIC POWER FROM A LOW-FREQUENCY OR EQUIPMENT SOURCE TO A LOAD AND ALIGNMENT FOR EXERCISING THE PROCEDURE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8200666A SE430196B (en) 1982-02-05 1982-02-05 SET AND DEVICE TO CHANGE THE POWER OF ELECTRIC POWER FROM A LOW FREQUENCY OR AIR VOLTAGE CELL TO A LOAD
SE8200666-9820205 1982-02-05

Publications (1)

Publication Number Publication Date
WO1983002860A1 true WO1983002860A1 (en) 1983-08-18

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PCT/SE1983/000023 Ceased WO1983002860A1 (en) 1982-02-05 1983-01-26 Method of securely interrupting the electric power supply from a low-frequency or direct voltage source to a load, and apparatus for carrying out the method

Country Status (10)

Country Link
US (1) US4591964A (en)
EP (1) EP0100331B1 (en)
AU (1) AU549395B2 (en)
DE (1) DE3380335D1 (en)
DK (1) DK159230C (en)
ES (1) ES8407269A1 (en)
FI (1) FI81930C (en)
IT (1) IT1193662B (en)
SE (1) SE430196B (en)
WO (1) WO1983002860A1 (en)

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EP0447405A4 (en) * 1988-12-06 1992-06-03 Boral Johns Perry Industies Pty. Ltd. Control system for a motor
GB2262673A (en) * 1991-12-09 1993-06-23 Abb Stroemberg Drives Oy Control circuit for a semiconductor switch

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US4706180A (en) * 1985-11-29 1987-11-10 York International Corporation Pulse width modulated inverter system for driving single phase a-c induction motor
US5252905A (en) * 1985-12-23 1993-10-12 York International Corporation Driving system for single phase A-C induction motor
US4689731A (en) * 1986-08-07 1987-08-25 Honeywell Inc. MOSFET inverter gate drive circuit
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Also Published As

Publication number Publication date
EP0100331B1 (en) 1989-08-02
ES519541A0 (en) 1984-09-01
DK159230C (en) 1991-03-04
DK159230B (en) 1990-09-17
IT1193662B (en) 1988-07-21
IT8319434A0 (en) 1983-02-04
EP0100331A1 (en) 1984-02-15
SE8200666L (en) 1983-08-06
US4591964A (en) 1986-05-27
DE3380335D1 (en) 1989-09-07
FI81930C (en) 1990-12-10
AU1154483A (en) 1983-08-25
FI833382L (en) 1983-09-21
FI81930B (en) 1990-08-31
AU549395B2 (en) 1986-01-23
ES8407269A1 (en) 1984-09-01
DK458083A (en) 1983-10-04
DK458083D0 (en) 1983-10-04
SE430196B (en) 1983-10-24
FI833382A0 (en) 1983-09-21

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