GB1268559A - Improvements relating to protective circuitry - Google Patents

Improvements relating to protective circuitry

Info

Publication number
GB1268559A
GB1268559A GB6188369A GB6188369A GB1268559A GB 1268559 A GB1268559 A GB 1268559A GB 6188369 A GB6188369 A GB 6188369A GB 6188369 A GB6188369 A GB 6188369A GB 1268559 A GB1268559 A GB 1268559A
Authority
GB
United Kingdom
Prior art keywords
transistor
circuit
output
resistor
zener diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB6188369A
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 claimed from DE19681816332 external-priority patent/DE1816332A1/en
Priority claimed from DE19691901075 external-priority patent/DE1901075A1/en
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1268559A publication Critical patent/GB1268559A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/72—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
    • H02H3/023—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order by short-circuiting
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

1,268,559. Transistor switching circuits. ROBERT BOSCH G.m.b.H. 19 Dec., 1969 [21 Dec., 1968; 10 Jan., 1969], No. 61883/69. Heading H3T. [Also in Divisions G3 and H2] A two terminal transistor circuit 21, Fig. 1 (Figs. 2, 3 or 4, not shown) forms part of a voltage regulator and responds to an excessive voltage across it, such as the rectified output on lines 17, 22, of a generator 10, by changing its impedance from a high value to an irreversibly low value such as by destructive shortcircuiting of the transistor. The generator output is controlled in normal operation by successive switching on and off of the field current in winding 14 by a bi-stable circuit 39. A transistor 33 therein is normally off and holds a transistor 34 on to energize the winding 14. When the rectified generator output on line 22 rises sufficiently a Zener diode 32 conducts and turns T33 on and T34 goes off, reciprocal coupling being effected through R37. De-energizing the field winding 14 causes the generator output to fall and the bi-stable eventually resets, the cycle repeating ten or more times per second. If due to a failure, the output voltage continues to rise uncontrolled, the two terminal circuit 21 shorts the lines 22, 17 and thereby collapses the output and the field voltages. The circuit 21 may consist of a transistor (47, Fig. 2, not shown) held off by a resistor 48 between base and emitter. Alternatively it may include a complementary pair of transistors (Figs. 3, 4, not shown) each having its main current path in the control circuit of the other; and a Zener diode (149, 249) across the collector and emitter of one in series with a resistor (147, 247) across the base emitter of the other, the Zener diode and resistor being connected to the two terminals of the circuit. A capacitor is provided to prevent transients from operating the circuit. In all three embodiments excessive voltage produces breakdown of the transistor and ultimate destruction. The circuits of Figs. 2, 3, 4 (not shown) may involve integrated circuit technique.
GB6188369A 1968-12-21 1969-12-19 Improvements relating to protective circuitry Expired GB1268559A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19681816332 DE1816332A1 (en) 1968-12-21 1968-12-21 Two-pole electrical switching element
DE19691901075 DE1901075A1 (en) 1969-01-10 1969-01-10 Two-pole electrical switching element

Publications (1)

Publication Number Publication Date
GB1268559A true GB1268559A (en) 1972-03-29

Family

ID=25756628

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6188369A Expired GB1268559A (en) 1968-12-21 1969-12-19 Improvements relating to protective circuitry

Country Status (1)

Country Link
GB (1) GB1268559A (en)

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