US3689800A - Arrangement for disconnecting consumers from a direct current voltage supply source - Google Patents

Arrangement for disconnecting consumers from a direct current voltage supply source Download PDF

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Publication number
US3689800A
US3689800A US135665A US3689800DA US3689800A US 3689800 A US3689800 A US 3689800A US 135665 A US135665 A US 135665A US 3689800D A US3689800D A US 3689800DA US 3689800 A US3689800 A US 3689800A
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United States
Prior art keywords
circuit
contacts
short
potentials
thyristor
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Expired - Lifetime
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US135665A
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English (en)
Inventor
Waldemar Lau
Anton Schaffernak
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BBC Brown Boveri AG Germany
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Bbc Brown Boveri & Cie
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
    • H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device

Definitions

  • Mitillllgeseusiiha- Boveri & A protective circuit arrangement is provided for Baden, SWllZerland disconnecting a consumer requiring different poten- [22] Filed: April 20 1971 tials at different input terminals from a direct current 9 power source having two output terminals supplying PP No.2 135,665 the different potentials in the event of a short-circuit between the potential terminals.
  • the protective circuit 3 includes a pair of mechanical circuit breakers located 0] Forelgn Apphcauon Pnomy Data respectively in the connection lines extending between April 30, 1970 Germany ..P 20 21 206.0 the power output and consumer input terminals which 1 I are each equipped with current overload contact [52] US. Cl.
  • the Potential terminals Serves to establish a current [58] Field of Search .;'...317/46, 16, 31, 27, 33 so; l P from one of h connection lines to ground 07 94 100, 131, 130, 86 and short-circuit the input terminals of the consumer until one of the circuit breakers functions through its 5 References Cited current overload release mechanism to open its contacts.
  • the contacts of the two circuit breakers are UNITED STATES PATENTS mechanically coupled by an insulating coupling so that an opening movement of the contacts of one circuit breaker causes the contacts of the other circuit aco S breaker to Open 8180 3,225,257 12/1965 Fegley ..317/46 X 3.475.653 10/ 1969 Odenberg ..317/16 6 Claims, 2 Drawing Figures 2 5 1a 5 jLe I A 7a.
  • d.c. voltages of different magnitude and polarity.
  • the difference between the required d.c. voltages may amount to as much as 200 volts in the case where semiconductor components for numeral indicator tubes are used at the same time.
  • safety measures must be taken to protect the extremely sensitive semiconductor components of the possibly already connected electronic system against excess voltages in the event of short-circuits between the various voltage terminals of the power supply arrangement.
  • Such protective arrangements should have as short a response time as possible since even brief, high voltage pluses may lead to either the damage," or complete destruction of the semiconductorcomponents.
  • Another requirement to be met by such protective devices is their re-usability after having been triggered, whereby safe operation, even after frequent triggering, must be assured.
  • the principal objective of the present invention is to provide an improved protective device of the character described which is relatively simple and inexpensive and also avoids the two disadvantages referred to above. That is to say, the protective device has a satisfactorily short response time and can be re-used repeatedly.
  • the problem is solved in that a mechanical circuit breaker is disposed between each of the different voltage output terminals of the d.c. voltage supply source and the corresponding input terminals of the consumer, and that in the event of a short-circuit between the output terminals of the d.c. power source, or between the input terminals of the consumer, an electronic circuit is activated to provide a connection between the wire carrying the lower of the two d.c. output voltages and a ground wire which thereby serves to connect both input terminals of the consumer to ground potential until the circuit breaker responds and isolates the consumer input terminals from its d.c. power supply source.
  • the electronic circuit connector to establish the desired short-circuit is formed by an inseries arrangement of a Zener diode connected to the connecting wire with the lowest d.c. potential and of a blocking resistor, as well as by a thyristor paralleled to this in-series arrangement of the Zener diode and blocking resistor.
  • the control electrode of the thyristor is charged with a current pulse flowing through the Zener diode which serves to ignite the thyristor.
  • a current limiting resistor to be connected between the connecting wire having the lowest d.c. potential and the thyristor.
  • the solution to the problem ' is characterized in that a mechanical circuit breaker is disposed between each of the different voltage output terminals of the d.c. voltage supply source and the corresponding input terminals of the consumer, that an inseries arrangement of a Zener diode and blocking resistor is disposed between a connecting wire having the lowest d.c. supply potential and a ground wire, and that a thyristor is disposed between a connecting wire having the highest d.c. supply potential and the ground wire.
  • a current limiting resistor is also provided between the connecting wire having the highest d.c. supply potential and the ground wire, this resistor being connected in series with the thyristor.
  • FIG. 1 is a schematic electrical circuit diagram of a dual d.c. voltage supply circuit together with one embodiment of the inventive consumer protective circuit
  • FIG. 2 is also a schematic electrical circuit diagram similar to that of FIG. 1 but illustrating a modification for the arrangement of the current limiting resistor that is connected in series with the thyristor element of the protective circuit.
  • 1 and 2 designate the voltage output terminals of a d.c. power supply source 3 which have different potential levels; 4 and 5 are input terminals of a not further detailed consumer; 6 are mechanical circuit breakers; 7 switch contacts; 8 is a coupling element; 9 a voltage-carrying connecting wire; 10 a ground wire; 11 an electronic circuit connector; 12 a Zener diode; 13 a blocking resistor; 14 a thyristor; 15 a limiting resistor; 16 and 17 are impedances of the d.c. power source 3; and 18 is another voltage-carrying connecting wire.
  • mechanical circuit breakers 6 are provided respectively between each of the output terminals 1, 2 of a d.c. power source 3 and input terminals 4, 5 of a not further detailed consumer of the electronic type including semiconductor com ponents requiring protection.
  • the switch contacts 7 of the circuit breakers 6 are mechanically interconnected with each other through an electrically insulating, rigid coupling element 8.
  • An electronic circuit connector 1 1 is disposed between a connecting wire 9 having the lowest of the two d.c. output potentials and a ground wire 10. In the event of a short-circuit between the output terminals 1, 2 of the d.c.
  • the electronic circuit connector 11 responds and establishes a current-carrying connection between the connecting wire 9 and the ground wire 10.
  • the input terminals 4, 5 of .the consumer are thereby connected to ground potential so that the excess voltage prevailing at the input terminal 5, up to the response of the electronic circuit connector 11, collapses.
  • the response time of the circuit connector 11 amounts to a few microseconds and is thus below the limital duration of a voltage pulse harmful to the semiconductor components of the consumer.
  • the circuit connector 11 maintainsthe current-carrying connection between the connecting wire 9 and the ground wire 10 until a sufficiently strong magnetic field has built up in the coil of one of the circuit breakers 6, due to the short-circuit current, to break the switch contact 7.
  • breaking of the switch contacts of one circuit breaker causes the switch contacts of the other circuit breaker to break at the same time so that the consumer is disconnected completely from the dual voltage d.c. power source 3.
  • the response time of the circuit breaker 6 is longer by a factor of 10 than the response time of the circuit connector 11 and hence would, by itself be too long to protect the semiconductor components of the consumer effectively.
  • the time span between the response of the circuit connector 11 and the tripping of the circuit breaker 6 is too short for the electronic circuit connector 11 to become damaged or destroyed by the partly very high short-circuit current pulse, thereby assuring the reusability of the entire protective device.
  • the electronic circuit connector 11 consists of two parallel branches of which one branch is formed by the inseries arrangement of a Zener diode l2 and a blocking resistor 13 and the other branch of a thyristor 14.
  • a limiting resistor may be inserted between the anode of the thyristor 14 and the lower voltage-carrying connecting wire 9.
  • the cathode of Zener diode 12 is connected to the lowest voltage so that this diode blocks in the normal operating condition, the threshold voltage dropping at it.
  • the anode of the Zener diode 12 is connected to one end of the blocking resistor 13, on the one hand, and to the control electrode of the thyristor 14 on the other hand.
  • FIG. 2 The operating mode of the circuit connector 11 is the same as that of the circuit connector 11 according to FIG. 1 because there is a conductive connection between the connecting wires 9 and 18 in the event of a short-circuit.
  • a protective circuit arrangement for disconnecting a consumer requiring different potentials at different input terminals thereof from a direct current power source having two output terminals supplying the different potentials in the event of a short-circuit between the potential terminals which comprises a pair of mechanical circuit breakers located respectively in the connection lines extending between said power output and consumer input terminals a current overload release mechanism provided on each circuit breaker for opening the breaker'contacts, and an electronic circuit means responsive upon the occurrence of a short-circuit between the potential terminals for establishing a current flow path between said connection line having the lower of said potentials and ground thereby to short-circuit said input terminals until one of said circuit breakers functions through its current overload release mechanism to open its contacts, said elec tronic circuit means being constituted by a Zener diode connected in series with a blocking resistor and a thyristor connected in parallel with said series connected Zener diode and blocking resistor, the ignition electrode of said thyristor being connected to the junction between said Zener diode and blocking
  • a protective arrangement operative for disconnecting a consumer requiring different potentials at different input terminals thereof from a direct current power source having two output potentials supplying the different potentials in the event of a short-circuit between the potential terminals, which comprises a pair of mechanical circuit breakers located respectively in the connection lines extending between said power output and consumer input terminals, a current overload release provided on each circuit breaker for opening the breaker contacts, a Zener diode and a blocking resistor connected in series between said connection line having the lower of said potentials and ground, and a thyristor connected between said connection line having thehigher of said potentials and ground, the ignition electrode of said thyristor being connected to the junction between said Zener diode and blocking re- 6.

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  • Emergency Protection Circuit Devices (AREA)
US135665A 1970-04-30 1971-04-20 Arrangement for disconnecting consumers from a direct current voltage supply source Expired - Lifetime US3689800A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19702021206 DE2021206A1 (de) 1970-04-30 1970-04-30 Anordnung zur Trennung eines Verbrauchers von einer Gleichspannungsquelle

Publications (1)

Publication Number Publication Date
US3689800A true US3689800A (en) 1972-09-05

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ID=5769891

Family Applications (1)

Application Number Title Priority Date Filing Date
US135665A Expired - Lifetime US3689800A (en) 1970-04-30 1971-04-20 Arrangement for disconnecting consumers from a direct current voltage supply source

Country Status (8)

Country Link
US (1) US3689800A (enrdf_load_stackoverflow)
JP (1) JPS4822944A (enrdf_load_stackoverflow)
AT (1) AT304682B (enrdf_load_stackoverflow)
BE (1) BE766407A (enrdf_load_stackoverflow)
CH (1) CH525577A (enrdf_load_stackoverflow)
DE (1) DE2021206A1 (enrdf_load_stackoverflow)
FR (1) FR2086498B1 (enrdf_load_stackoverflow)
NL (1) NL7105725A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439802A (en) * 1980-09-26 1984-03-27 Telefonaktiebolaget L M Ericsson Overvoltage guard for electronic circuits
US20050207075A1 (en) * 2002-08-02 2005-09-22 Protectelec Pty Limited Control circuit and a method for electrically connecting a load to a power source
US20050235506A1 (en) * 2004-04-22 2005-10-27 Eastman Kodak Company Method for profilometer position registration

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5142579U (enrdf_load_stackoverflow) * 1974-09-26 1976-03-29

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920241A (en) * 1956-04-16 1960-01-05 Chase Shawmut Co Circuit interrupters with back-up current-limiting fuses
US3167685A (en) * 1961-05-08 1965-01-26 Gen Precision Inc Computer protection circuit
US3225257A (en) * 1962-10-09 1965-12-21 Burroughs Corp High speed direct current voltage fault sensing, indicating and load protecting apparatus
US3475653A (en) * 1965-01-11 1969-10-28 Res Iii Inc Electrical circuit protector
US3571659A (en) * 1968-11-08 1971-03-23 Tokyo Keiki Seizosho Co Ltd Switching device for power supply circuit
US3573554A (en) * 1969-07-01 1971-04-06 Us Navy Multiple power supply overvoltage and interlock controlled cutoff

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2920241A (en) * 1956-04-16 1960-01-05 Chase Shawmut Co Circuit interrupters with back-up current-limiting fuses
US3167685A (en) * 1961-05-08 1965-01-26 Gen Precision Inc Computer protection circuit
US3225257A (en) * 1962-10-09 1965-12-21 Burroughs Corp High speed direct current voltage fault sensing, indicating and load protecting apparatus
US3475653A (en) * 1965-01-11 1969-10-28 Res Iii Inc Electrical circuit protector
US3571659A (en) * 1968-11-08 1971-03-23 Tokyo Keiki Seizosho Co Ltd Switching device for power supply circuit
US3573554A (en) * 1969-07-01 1971-04-06 Us Navy Multiple power supply overvoltage and interlock controlled cutoff

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439802A (en) * 1980-09-26 1984-03-27 Telefonaktiebolaget L M Ericsson Overvoltage guard for electronic circuits
US20050207075A1 (en) * 2002-08-02 2005-09-22 Protectelec Pty Limited Control circuit and a method for electrically connecting a load to a power source
US7378761B2 (en) 2002-08-02 2008-05-27 Protectelec Pty Ltd Control circuit and a method for electrically connecting a load to a power source
US20050235506A1 (en) * 2004-04-22 2005-10-27 Eastman Kodak Company Method for profilometer position registration

Also Published As

Publication number Publication date
NL7105725A (enrdf_load_stackoverflow) 1971-11-02
AT304682B (de) 1973-01-25
BE766407A (fr) 1971-09-16
FR2086498B1 (enrdf_load_stackoverflow) 1974-02-15
CH525577A (de) 1972-07-15
FR2086498A1 (enrdf_load_stackoverflow) 1971-12-31
DE2021206A1 (de) 1971-11-11
JPS4822944A (enrdf_load_stackoverflow) 1973-03-24

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