GB2049326A - Device for switching D-C circuits - Google Patents

Device for switching D-C circuits Download PDF

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Publication number
GB2049326A
GB2049326A GB7916237A GB7916237A GB2049326A GB 2049326 A GB2049326 A GB 2049326A GB 7916237 A GB7916237 A GB 7916237A GB 7916237 A GB7916237 A GB 7916237A GB 2049326 A GB2049326 A GB 2049326A
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GB
United Kingdom
Prior art keywords
switch
transistor switch
switching
power
voltage
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.)
Granted
Application number
GB7916237A
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GB2049326B (en
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.)
CH POLT I
Original Assignee
CH POLT I
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
Priority to DE19792915322 priority Critical patent/DE2915322A1/en
Application filed by CH POLT I filed Critical CH POLT I
Priority to GB7916237A priority patent/GB2049326B/en
Priority to FR7915262A priority patent/FR2459542A1/en
Publication of GB2049326A publication Critical patent/GB2049326A/en
Application granted granted Critical
Publication of GB2049326B publication Critical patent/GB2049326B/en
Expired legal-status Critical Current

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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
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electronic Switches (AREA)
  • Keying Circuit Devices (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)

Abstract

comprises a transistor switch (1) having power electrodes (2,3) connected in parallel to a power contact (4) of an electromechanical switch, the control winding (5) of which is connected to the output of a threshold element (12). The control electrode (6) of the transistor switch (1) is connected to a control unit (7) having a switch (5). A second switch (9) is gauged with the switch (5) of the control unit (7) for connecting the power electrode (2) of the transistor switch (1) to the input of the threshold element. The device is intended mainly for switching in circuits of independent electrical systems and when supplying consumers with electrical energy such as in aircraft and transport vehicles. <IMAGE>

Description

SPECIFICATION Device for switching D-C circuits The present invention relates to a device for switching d-c circuits.
The invention provides a device for switching d-c circuits, comprising a transistor switch, an electromechanical switch having a power contact connected in parallel with the power electrodes of the transistor switch and a control winding connected to the output of a threshold element, a control unit connected to the control electrode of the transistor switch and having a first switch, and a second switch the switching contact of which is rigidly connected to the switching contact of the first switch and which, when closed, connects one of said power electrodes of the transistor switch to the input of the threshotd element.
The invention will now be more particularly described with reference to the accompanying drawing which is an electrical circuit diagram of one embodiment of a device according to the invention.
Referring to the drawing, the switching device shown therein comprises a transistor switch 1, to the power electrodes 2, 3 of which is connected a power contact 4 of an electromechanical switch having a conrol winding 5. The control electrode 6 of the transistor switch 1 is connected to a control unit 7 having a switch 8.
The device includes a second switch 9 whose switching contact 10 is rigidly connected to a switching contact 11 of the switch 8 and is connected to the power electrode 2 of the transistor switch 1.
There is also provided threshold element 12 whose output is connected to the control winding 5 of the electromechanical switch. The input 13 of the threshold element 12 is connected to a fixed contact 14 of the switch 9.
In this particular embodiment a bipolar transistor is used as the transistor switch 1. However, a unipolar transistor may be used. The control unit 7 produces a linear or exponential signal for rendering the transistor switch conductive and nonconductive.
In this embodiment the threshold element is a Schmitt trigger circuit.
The d-c circuit comprises a load 15 connected to the power electrode 2 of the transistor switch. The load 15 is inserted into the circuit of a power supply circuit 16 whose substitution circuit includes an e.m.f, source 17 and an active-inductive internal resistance 18.
The device operates as follows.
In the initial "OFF" position the switches 8 and 9 are rendered nonconductive. In this case the control unit 7 produces a voltage rendering the transistor switch 1 nonconductive. The voltage at the output of the threshold element 12 is zero, the control winding 5 of the electromechanical switch is deenergized and its power contact 4 is open.
When the switches 8 and 9 are put into the "ON" position, the control unit 7 produces a signal increasing linearly or exponentially, which renders the transistor switch 1 conductive. The current flowing through the electrical energy consumer 15 is varied according to the linear or exponential law. The voltage across the power electrodes 2, 3 of the transistor switch 1 is fed through the closed contacts of the switch 9 to the input 13 of the threshold element 12.
Upon reducing this voltage to a value U1, where U1 is the voltage on the threshold element 12, the element 12 is switched over, and a switching voltage is applied to the winding 5 of the electromechanical switch. This results in a change-over of the electromechanical switch and in closure of its power contact 4.
The switching voltage U1 of the threshold element 12 is set up on the condition: U1 > U7, where U2 is the saturation voltage of the transistor switch 1.
Since the device provides automatic synchronization of the operation of the transistor switch 1 and electromechanical switch and the operation of the electromechanical switch takes place at a low voltage on the power contact 4, the switching voltage fluctuations are very low.
When the switches 8 and 9 are set to the "OFF" position, the threshold element 12 is switched over and this deenergizes the electromechanical switch and opens its power contact 4. When the power contact 4 of the electromechanical switch is open, the transistor switch 1 is in a saturated state, since the control unit 7 had no time in bringing it to the linear region. For this reason, during the breaking of the power contact 4 the voltage on the power electrodes 2 and 3 of the transistor switch 1 is low and is equal to the voltage U1, which assists in reducing the switching voltage fluctuation of the power source 16.
The control unit 7 produces a linearly or exponentially varying cutoff voltage causing linear or exponential decrease in the current flowing through the power electrodes 2 and 3 of the transistor switch 1 and electrical energy consumer 15. Upon reaching on the control electrode 6 of the transistor switch 1 a voltage required for rendering the transistor switch 1 nonconductive, the device is returned to its initial condition.
The device is intended mainly for switching in circuits of independent electrical systems and when supplying consumers with electrical energy, such as in aircraft and transport vehicles.
1. A device for switching d-c circuits, comprising a transistor switch, an electromechanical switch having a power contact connected in parallel with the power electrodes of the transistor switch and a control winding connected to the output of a threshold element, a control unit connected to the control electrode of the transistor switch and having a first switch and a second switch, the switching contact of which is rigidly connected to the switching contact of the first switch and which, when closed, connects one of said power electrodes of the transistor switch to the input of the threshold element.
2. A device for switching d-c circuits substantial
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (2)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Device for switching D-C circuits The present invention relates to a device for switching d-c circuits. The invention provides a device for switching d-c circuits, comprising a transistor switch, an electromechanical switch having a power contact connected in parallel with the power electrodes of the transistor switch and a control winding connected to the output of a threshold element, a control unit connected to the control electrode of the transistor switch and having a first switch, and a second switch the switching contact of which is rigidly connected to the switching contact of the first switch and which, when closed, connects one of said power electrodes of the transistor switch to the input of the threshotd element. The invention will now be more particularly described with reference to the accompanying drawing which is an electrical circuit diagram of one embodiment of a device according to the invention. Referring to the drawing, the switching device shown therein comprises a transistor switch 1, to the power electrodes 2, 3 of which is connected a power contact 4 of an electromechanical switch having a conrol winding 5. The control electrode 6 of the transistor switch 1 is connected to a control unit 7 having a switch 8. The device includes a second switch 9 whose switching contact 10 is rigidly connected to a switching contact 11 of the switch 8 and is connected to the power electrode 2 of the transistor switch 1. There is also provided threshold element 12 whose output is connected to the control winding 5 of the electromechanical switch. The input 13 of the threshold element 12 is connected to a fixed contact 14 of the switch 9. In this particular embodiment a bipolar transistor is used as the transistor switch 1. However, a unipolar transistor may be used. The control unit 7 produces a linear or exponential signal for rendering the transistor switch conductive and nonconductive. In this embodiment the threshold element is a Schmitt trigger circuit. The d-c circuit comprises a load 15 connected to the power electrode 2 of the transistor switch. The load 15 is inserted into the circuit of a power supply circuit 16 whose substitution circuit includes an e.m.f, source 17 and an active-inductive internal resistance 18. The device operates as follows. In the initial "OFF" position the switches 8 and 9 are rendered nonconductive. In this case the control unit 7 produces a voltage rendering the transistor switch 1 nonconductive. The voltage at the output of the threshold element 12 is zero, the control winding 5 of the electromechanical switch is deenergized and its power contact 4 is open. When the switches 8 and 9 are put into the "ON" position, the control unit 7 produces a signal increasing linearly or exponentially, which renders the transistor switch 1 conductive. The current flowing through the electrical energy consumer 15 is varied according to the linear or exponential law. The voltage across the power electrodes 2, 3 of the transistor switch 1 is fed through the closed contacts of the switch 9 to the input 13 of the threshold element 12. Upon reducing this voltage to a value U1, where U1 is the voltage on the threshold element 12, the element 12 is switched over, and a switching voltage is applied to the winding 5 of the electromechanical switch. This results in a change-over of the electromechanical switch and in closure of its power contact 4. The switching voltage U1 of the threshold element 12 is set up on the condition: U1 > U7, where U2 is the saturation voltage of the transistor switch 1. Since the device provides automatic synchronization of the operation of the transistor switch 1 and electromechanical switch and the operation of the electromechanical switch takes place at a low voltage on the power contact 4, the switching voltage fluctuations are very low. When the switches 8 and 9 are set to the "OFF" position, the threshold element 12 is switched over and this deenergizes the electromechanical switch and opens its power contact 4. When the power contact 4 of the electromechanical switch is open, the transistor switch 1 is in a saturated state, since the control unit 7 had no time in bringing it to the linear region. For this reason, during the breaking of the power contact 4 the voltage on the power electrodes 2 and 3 of the transistor switch 1 is low and is equal to the voltage U1, which assists in reducing the switching voltage fluctuation of the power source 16. The control unit 7 produces a linearly or exponentially varying cutoff voltage causing linear or exponential decrease in the current flowing through the power electrodes 2 and 3 of the transistor switch 1 and electrical energy consumer 15. Upon reaching on the control electrode 6 of the transistor switch 1 a voltage required for rendering the transistor switch 1 nonconductive, the device is returned to its initial condition. The device is intended mainly for switching in circuits of independent electrical systems and when supplying consumers with electrical energy, such as in aircraft and transport vehicles. CLAIMS
1. A device for switching d-c circuits, comprising a transistor switch, an electromechanical switch having a power contact connected in parallel with the power electrodes of the transistor switch and a control winding connected to the output of a threshold element, a control unit connected to the control electrode of the transistor switch and having a first switch and a second switch, the switching contact of which is rigidly connected to the switching contact of the first switch and which, when closed, connects one of said power electrodes of the transistor switch to the input of the threshold element.
2. A device for switching d-c circuits substantial ly as hereinbefore described with reference to and as shown in the accompanYing drawing.
GB7916237A 1979-04-14 1979-05-10 Device for switching d-c circuits Expired GB2049326B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19792915322 DE2915322A1 (en) 1979-04-14 1979-04-14 COMMUTING DEVICE FOR DC CIRCUITS
GB7916237A GB2049326B (en) 1979-04-14 1979-05-10 Device for switching d-c circuits
FR7915262A FR2459542A1 (en) 1979-04-14 1979-06-14 DEVICE FOR SWITCHING CONTINUOUS CURRENT CIRCUITS, IN PARTICULAR FOR SUPPRESSING THE FORMATION OF ARCS AND REDUCING VOLTAGE VARIANCES DUE TO SWITCHES

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19792915322 DE2915322A1 (en) 1979-04-14 1979-04-14 COMMUTING DEVICE FOR DC CIRCUITS
GB7916237A GB2049326B (en) 1979-04-14 1979-05-10 Device for switching d-c circuits
FR7915262A FR2459542A1 (en) 1979-04-14 1979-06-14 DEVICE FOR SWITCHING CONTINUOUS CURRENT CIRCUITS, IN PARTICULAR FOR SUPPRESSING THE FORMATION OF ARCS AND REDUCING VOLTAGE VARIANCES DUE TO SWITCHES

Publications (2)

Publication Number Publication Date
GB2049326A true GB2049326A (en) 1980-12-17
GB2049326B GB2049326B (en) 1983-05-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB7916237A Expired GB2049326B (en) 1979-04-14 1979-05-10 Device for switching d-c circuits

Country Status (3)

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DE (1) DE2915322A1 (en)
FR (1) FR2459542A1 (en)
GB (1) GB2049326B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0179982A2 (en) * 1984-10-31 1986-05-07 International Business Machines Corporation High power direct current switching circuit
EP2048679A1 (en) * 2007-10-12 2009-04-15 SMA Solar Technology AG Circuit breaker assembly

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636906A (en) * 1985-04-24 1987-01-13 General Electric Company Solid state circuit interruption employing a stored charge power transistor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2269185A1 (en) * 1974-04-23 1975-11-21 Thomson Csf Transient overcurrent limiting device - has amplifier in parallel with load switch and control device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0179982A2 (en) * 1984-10-31 1986-05-07 International Business Machines Corporation High power direct current switching circuit
EP0179982A3 (en) * 1984-10-31 1988-01-07 International Business Machines Corporation High power direct current switching circuit
EP2048679A1 (en) * 2007-10-12 2009-04-15 SMA Solar Technology AG Circuit breaker assembly
US8213133B2 (en) 2007-10-12 2012-07-03 Sma Solar Technology Ag Load breaker arrangement

Also Published As

Publication number Publication date
FR2459542B1 (en) 1982-04-16
DE2915322A1 (en) 1980-10-30
GB2049326B (en) 1983-05-18
FR2459542A1 (en) 1981-01-09

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PCNP Patent ceased through non-payment of renewal fee