GB1275749A - Electrical circuits for controlling a current through a load - Google Patents
Electrical circuits for controlling a current through a loadInfo
- Publication number
- GB1275749A GB1275749A GB3048868A GB3048868A GB1275749A GB 1275749 A GB1275749 A GB 1275749A GB 3048868 A GB3048868 A GB 3048868A GB 3048868 A GB3048868 A GB 3048868A GB 1275749 A GB1275749 A GB 1275749A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitor
- current
- load
- charge
- halfcycle
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
- H05B39/04—Controlling
- H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
- H05B39/083—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity
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)
Abstract
1275749 Switching circuits for consuming devices B K FINNIMORE 26 June 1969 [26 June 1968] 30488/68 Heading H2H The current in a load is controlled by varying the firing angle of a controllable rectifier in dependence or the state of charge of two capacitors. In the circuit of Fig. 1, closure of a switch 13 initiates a slow build-up of charge on a capacitor 18. A transistor 21 becomes conductive and another capacitor 23 charges rapidly until a voltage sufficient to trigger the thyristor 14 is reached. The load 10 now draws a greatly increased current for the remainder of the halfcycle, a too rapid rise in current being prevented by a filter circuit 26, 27. In a subsequent halfcycle, the charge on the capacitor 18 will be higher, so that current can flow more rapidly into the capacitor 23 and the load will be fully energized for a greater part of the half-cycle. Hence, the average current in the load, which may be a lamp, builds up gradually to a maximum when the capacitor 18 is fully charged. The resistor 19 may be varied to change the rate of increase. A shorting switch may be connected across the capacitor 18 to allow the lamp to be dimmed. In modifications, the thyristor 14 may be replaced by a pair of anti-parallel thyristors or by a triac triggered by a diac.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3048868A GB1275749A (en) | 1968-06-26 | 1968-06-26 | Electrical circuits for controlling a current through a load |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3048868A GB1275749A (en) | 1968-06-26 | 1968-06-26 | Electrical circuits for controlling a current through a load |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1275749A true GB1275749A (en) | 1972-05-24 |
Family
ID=10308464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3048868A Expired GB1275749A (en) | 1968-06-26 | 1968-06-26 | Electrical circuits for controlling a current through a load |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1275749A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4359681A (en) * | 1980-05-01 | 1982-11-16 | Westinghouse Electric Corp. | Alternating current power controller with DC transistor switching and an internal DC power supply |
GB2160723A (en) * | 1984-06-01 | 1985-12-24 | Hayashibara Ken | Surge current suppressing adapter for an incandescent lamp |
US4705963A (en) * | 1984-09-18 | 1987-11-10 | Smiths Industries Public Limited Company | AC controlled diode switch |
WO1998024181A1 (en) * | 1996-11-25 | 1998-06-04 | Beacon Light Products, Inc. | Smooth switching module |
GB2323724A (en) * | 1997-03-26 | 1998-09-30 | David Esmond Holland | Electrical switching arrangement giving slow turn-on |
US5861720A (en) * | 1996-11-25 | 1999-01-19 | Beacon Light Products, Inc. | Smooth switching power control circuit and method |
-
1968
- 1968-06-26 GB GB3048868A patent/GB1275749A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4359681A (en) * | 1980-05-01 | 1982-11-16 | Westinghouse Electric Corp. | Alternating current power controller with DC transistor switching and an internal DC power supply |
GB2160723A (en) * | 1984-06-01 | 1985-12-24 | Hayashibara Ken | Surge current suppressing adapter for an incandescent lamp |
US4705963A (en) * | 1984-09-18 | 1987-11-10 | Smiths Industries Public Limited Company | AC controlled diode switch |
WO1998024181A1 (en) * | 1996-11-25 | 1998-06-04 | Beacon Light Products, Inc. | Smooth switching module |
US5861720A (en) * | 1996-11-25 | 1999-01-19 | Beacon Light Products, Inc. | Smooth switching power control circuit and method |
US5861721A (en) * | 1996-11-25 | 1999-01-19 | Beacon Light Products, Inc. | Smooth switching module |
GB2323724A (en) * | 1997-03-26 | 1998-09-30 | David Esmond Holland | Electrical switching arrangement giving slow turn-on |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PLNP | Patent lapsed through nonpayment of renewal fees |