GB1203061A - Improvements in or relating to scr triggering circuits - Google Patents
Improvements in or relating to scr triggering circuitsInfo
- Publication number
- GB1203061A GB1203061A GB41410/67A GB4141067A GB1203061A GB 1203061 A GB1203061 A GB 1203061A GB 41410/67 A GB41410/67 A GB 41410/67A GB 4141067 A GB4141067 A GB 4141067A GB 1203061 A GB1203061 A GB 1203061A
- Authority
- GB
- United Kingdom
- Prior art keywords
- supply
- control
- phase
- pscr
- thyristor
- 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
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/40—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices
- G05F1/44—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only
- G05F1/45—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load
- G05F1/455—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using discharge tubes or semiconductor devices as final control devices semiconductor devices only being controlled rectifiers in series with the load with phase control
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/081—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/40—Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Control Of Electrical Variables (AREA)
- Crushing And Grinding (AREA)
- Electronic Switches (AREA)
- Control Of Direct Current Motors (AREA)
- Rectifiers (AREA)
Abstract
1,203,061. Automatic current control. FMC CORP. Sept.11, 1967 [Sept.14, 1966], No.41410/67. Heading G3R. [Also in Division H2] A circuit for triggering a silicon controlled rectifier comprises a uni-junction transistor TR1, the two bases B1, B2 being coupled across a A.C. supply L10, a Zener diode Z2 being interposed between the A.C. supply and the transistor TR1 so as to convert the A.C. supply into pulses and a phase shifter Fig.3 being included in the connections to the A.C. supply so as to advance the phase of the supply to TR1 relative to that feeding the main thyristors. The phase shifter Fig.3 thus ensures that the main thyristor can be made conductive over a full half cycle even when feeding an inductive load. As described, the main thyristor PSCR-A controls the current in an inductive load formed by a vibratory conveyer feeding a crusher. The current of the three-phase crusher motor is monitored by transformer CT and after rectifying at D10...D13 is used to control the conductivity of a transistor TR2 which in turn controls the firing angle of uni-junction transistor TR1 which provides pulses of appropriate phase to control thyristor CSCR-A which in turn fires power thyristor PSCR-A in such a way as to keep the load constant on the crusher motor. A further alternative control utilizers a permanent magnet Fig.2 fixed to the moving part of the vibratory conveyer adjacent a stationary coil MP57 the output of which is rectified at D21...D24 and used to control the output of a magnetic amplifier comprising high retentivity magnetic rings 47, 48 supplied with A.C. from secondary windings S8 and providing partial half cycles, the negative of which is removed by diode D20, and the leading edge of which is a function of the conveyer output as determined by winding MP57. These pulses are fed to terminal H in Fig.1 so as to control the triggering phase of TR1 and hence that of the main thyristor PSCR-A. The minimum feedrate is set by potentiometer RH1 across a stabilized D.C. supply. Various manual controls RH5... RH9 may be switched in to terminals F, H. An independent load may be controlled by a further main thyristor PSCR-B.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57938566A | 1966-09-14 | 1966-09-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1203061A true GB1203061A (en) | 1970-08-26 |
Family
ID=24316687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB41410/67A Expired GB1203061A (en) | 1966-09-14 | 1967-09-11 | Improvements in or relating to scr triggering circuits |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS4822625B1 (en) |
| AT (1) | AT284963B (en) |
| BE (1) | BE703854A (en) |
| CH (1) | CH471494A (en) |
| ES (1) | ES344672A1 (en) |
| GB (1) | GB1203061A (en) |
| NL (1) | NL6711924A (en) |
| SE (1) | SE362362B (en) |
-
1967
- 1967-08-30 NL NL6711924A patent/NL6711924A/xx unknown
- 1967-08-31 ES ES344672A patent/ES344672A1/en not_active Expired
- 1967-09-11 GB GB41410/67A patent/GB1203061A/en not_active Expired
- 1967-09-12 SE SE12593/67A patent/SE362362B/xx unknown
- 1967-09-13 CH CH1280867A patent/CH471494A/en not_active IP Right Cessation
- 1967-09-14 JP JP42058717A patent/JPS4822625B1/ja active Pending
- 1967-09-14 BE BE703854D patent/BE703854A/xx unknown
- 1967-09-14 AT AT842767A patent/AT284963B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CH471494A (en) | 1969-04-15 |
| BE703854A (en) | 1968-03-14 |
| JPS4822625B1 (en) | 1973-07-07 |
| ES344672A1 (en) | 1968-10-16 |
| DE1638411A1 (en) | 1972-02-24 |
| NL6711924A (en) | 1968-03-15 |
| DE1638411B2 (en) | 1972-12-28 |
| SE362362B (en) | 1973-12-10 |
| AT284963B (en) | 1970-10-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |