GB925027A - A protective circuit arrangement for transistors - Google Patents
A protective circuit arrangement for transistorsInfo
- Publication number
- GB925027A GB925027A GB3009260A GB3009260A GB925027A GB 925027 A GB925027 A GB 925027A GB 3009260 A GB3009260 A GB 3009260A GB 3009260 A GB3009260 A GB 3009260A GB 925027 A GB925027 A GB 925027A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- circuit
- load
- capacitor
- current
- 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
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
- Dc-Dc Converters (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
925,027. Protective arrangements. SIEMENS & HALSKE A.G. Aug. 31, 1960 [Sept. 1, 1959], No. 30092/60. Class 38 (5). [Also in Group XL (c)] A normally saturated transistor is protected against overload by connecting in its output circuit, in series with the load, a switch device in parallel with a capacitor and by controlling the switch in dependence upon the transistor output voltage so that switch is closed only when the transistor is saturated. When transistor T1 is switched on by a voltage applied to its base, current flows through a capacitor C, rectifier D, the output path of the transistor and the load R, and if the transistor saturates the point A falls to earth potential. Accordingly, a transistor T3 becomes non-conducting and a Zener diode conducts, rendering a transistor T2 conducting. This provides a path for the load current. If the load current had been excessive, for example due to short a circuit, the transistor would not have saturated and transistor T2 would not have become conductive so that only the charging current for capacitor C would have been passed by the transistor. Excessive current due to a subsequent fault will also cause the transistor T2 to become non- conductive. The diode D prevents capacitor discharging through transistor T2 and resistor Rc provides an alternative discharge path. A diode R1 isolates the point A from transistor T3 so that the protective circuit T2, T3 may be used for a number of switching circuits such as T 1 by parallel connection at V. In an alternative circuit (Fig. 4, not shown), the load is connected in the emitter circuit of transistor T1 and the series transistor in the collector circuit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES64694A DE1168962B (en) | 1959-09-01 | 1959-09-01 | Circuit arrangement for avoiding overloading of a switching transistor |
Publications (1)
Publication Number | Publication Date |
---|---|
GB925027A true GB925027A (en) | 1963-05-01 |
Family
ID=7497396
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3009260A Expired GB925027A (en) | 1959-09-01 | 1960-08-31 | A protective circuit arrangement for transistors |
Country Status (4)
Country | Link |
---|---|
CH (1) | CH380810A (en) |
DE (1) | DE1168962B (en) |
GB (1) | GB925027A (en) |
NL (1) | NL255489A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0415039A2 (en) * | 1989-08-30 | 1991-03-06 | WABCO Vermögensverwaltungs-GmbH | Electronic circuit for monitoring a final amplifier and its load |
CN111983271A (en) * | 2019-05-21 | 2020-11-24 | 上海海拉电子有限公司 | Protection circuit for high-voltage insulation test |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2641183C2 (en) * | 1976-09-13 | 1986-08-28 | Andreas Prof. Dr.-Ing.habil. 7000 Stuttgart Boehringer | Installation without losses due to the principle of operation to relieve electrical or electronic one-way switches from their power dissipation when they are switched off |
DE2644715C2 (en) * | 1976-10-04 | 1985-02-28 | Andreas Prof. Dr.-Ing.habil. 7000 Stuttgart Boehringer | Device for relieving electrical or electronic one-way switches from high power dissipation during switch-on - in which a non-zero current previously flowing in a different circuit path changes to the relevant one-way switch - and from excessive blocking voltage stress at the end of switch-off |
US4441137A (en) * | 1982-08-30 | 1984-04-03 | Rca Corporation | High voltage protection for an output circuit |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE568405A (en) * | 1957-06-18 |
-
0
- NL NL255489D patent/NL255489A/xx unknown
-
1959
- 1959-09-01 DE DES64694A patent/DE1168962B/en active Pending
-
1960
- 1960-08-29 CH CH971360A patent/CH380810A/en unknown
- 1960-08-31 GB GB3009260A patent/GB925027A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0415039A2 (en) * | 1989-08-30 | 1991-03-06 | WABCO Vermögensverwaltungs-GmbH | Electronic circuit for monitoring a final amplifier and its load |
EP0415039A3 (en) * | 1989-08-30 | 1992-01-15 | Wabco Westinghouse Fahrzeugbremsen Gmbh | Electronic circuit for monitoring a final amplifier and its load |
CN111983271A (en) * | 2019-05-21 | 2020-11-24 | 上海海拉电子有限公司 | Protection circuit for high-voltage insulation test |
Also Published As
Publication number | Publication date |
---|---|
DE1168962B (en) | 1964-04-30 |
CH380810A (en) | 1964-08-15 |
NL255489A (en) |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB882126A (en) | Improvements in or relating to electrical inverter systems | |
US3239718A (en) | High speed alternating current fault sensing circuit | |
GB792120A (en) | Improvements in circuits employing semi-conductor devices | |
GB925027A (en) | A protective circuit arrangement for transistors | |
US3256448A (en) | Protection circuit of a transistor type direct current constant voltage device | |
US3390307A (en) | Electrical relays | |
GB840907A (en) | Improvements in or relating to quick-acting cut-out devices | |
GB870131A (en) | Improvements in electric pulse generator systems | |
GB919015A (en) | Transistor emitter follower | |
GB1031462A (en) | Voltage stabilisers | |
US3092735A (en) | Switching circuit for a ladder type digital to analog converter utilizing an alternating reference voltage | |
GB950183A (en) | Improvements in and relating to electrical circuits employing transistor networks | |
US3218477A (en) | Triggering arrangement for multivibrators | |
GB927468A (en) | A power dissipation protection (or reducing) circuit for transistor switches having inductive loads | |
GB928814A (en) | Improvements relating to voltage stabiliser circuits | |
GB900028A (en) | Improvements in or relating to signal separator devices | |
US3644760A (en) | Switching circuit for pulsing the control-current of a hall generator | |
US3261983A (en) | Transistor switch employing diodes for voltage protection | |
GB868998A (en) | Improvements in or relating to transistor circuits | |
GB917544A (en) | Improvements in or relating to electronic counters and the like | |
GB811091A (en) | Improvements in or relating to bistable trigger circuits | |
SU546996A1 (en) | Device to turn on backup power source | |
GB874667A (en) | Improvements in or relating to passive electronic switches | |
SU1310939A1 (en) | Device for protecting elements of switch sources of secondary electric power supply against overvoltage in a.c.network | |
GB906741A (en) | Improvements in or relating to transistor current switches |