GB1259458A - - Google Patents

Info

Publication number
GB1259458A
GB1259458A GB1259458DA GB1259458A GB 1259458 A GB1259458 A GB 1259458A GB 1259458D A GB1259458D A GB 1259458DA GB 1259458 A GB1259458 A GB 1259458A
Authority
GB
United Kingdom
Prior art keywords
transistor
current
impulse
voltage
predetermined
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
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 filed Critical
Publication of GB1259458A publication Critical patent/GB1259458A/en
Expired 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
    • H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches

Landscapes

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

Abstract

1,259,458. Protective arrangements. BRITISH RADIO CORP. Ltd. 31 July, 1969 [31 July, 1968], No. 36593/68. Heading H2K. [Also in Divisions G2-G3] A D.C. to D.C. voltage regulator of the type comprising a chopper transistor Tr2 controlled by a driver transistor Tr1 through a transformer T1 to maintain a predetermined voltage between output terminals 12, 14 is provided with a current limiting circuit to switch the transistor Tr2 off permanently or intermittently when the current therethrough exceeds a predetermined value. Regulation is effected by variation of the mark-space ratio of control pulses applied to the base of the transistor Tr1, thus providing corresponding current impulses through the transistor Tr2. A measure of each such impulse is provided by a voltage impulse derived from a Circuit C1, R1, which impulse is compared with a reference voltage provided by adjustment of the wiper of a potentiometer R2. When, during a current impulse, a predetermined . current value is reached corresponding to a predetermined relationship between the impulse and reference voltages, a silicon controlled rectifier SCR1 is triggered to turn off the transistor Tr2. By providing a suitable impedance (e.g. a diode D2) in series with the rectifier SCR1, the regulator may be arranged to operate in a current-limiting. mode, e.g. current limitation occurs if necessary during each current impulse. Alternatively a diode D1 may be provided to maintain the rectifier SCR1 conducting and so provide a trip mode of regulator operation. The transistor Tr1 may be used to turn off Tr2 upon production of an overcurrent signal. The invention may be applied to control a shunt chopper transistor.
GB1259458D 1968-07-31 1968-07-31 Expired GB1259458A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3659368 1968-07-31

Publications (1)

Publication Number Publication Date
GB1259458A true GB1259458A (en) 1972-01-05

Family

ID=10389548

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1259458D Expired GB1259458A (en) 1968-07-31 1968-07-31

Country Status (2)

Country Link
DE (1) DE1938954C3 (en)
GB (1) GB1259458A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143095A (en) * 1983-07-09 1985-01-30 Westfaelische Metall Industrie Protecting electrical circuits with a load-switching component

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1202906B (en) * 1979-03-20 1989-02-15 Sits Soc It Telecom Siemens CIRCUIT PROVISION FOR THE PILOTING OF A PARTIALIZER SWITCH, OF PARTICULAR APPLICATION IN A DIRECT CURRENT POWER SUPPLY
US4420804A (en) * 1980-08-26 1983-12-13 Tohoku Metal Industries, Ltd. Switching regulator with base charge removal circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2143095A (en) * 1983-07-09 1985-01-30 Westfaelische Metall Industrie Protecting electrical circuits with a load-switching component

Also Published As

Publication number Publication date
DE1938954A1 (en) 1970-06-25
DE1938954C3 (en) 1973-05-30
DE1938954B2 (en) 1972-11-09

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees