GB791905A - Improvements in or relating to circuit arrangements for producing substantially constant currents - Google Patents
Improvements in or relating to circuit arrangements for producing substantially constant currentsInfo
- Publication number
- GB791905A GB791905A GB37787/54A GB3778754A GB791905A GB 791905 A GB791905 A GB 791905A GB 37787/54 A GB37787/54 A GB 37787/54A GB 3778754 A GB3778754 A GB 3778754A GB 791905 A GB791905 A GB 791905A
- Authority
- GB
- United Kingdom
- Prior art keywords
- core
- current
- load
- cores
- changeover
- 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
- G05F1/32—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using magnetic devices having a controllable degree of saturation as final control devices
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/012—Automatic controllers electric details of the transmission means
- G05B11/016—Automatic controllers electric details of the transmission means using inductance means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
- G11C19/04—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using cores with one aperture or magnetic loop
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/02—Adaptations of transformers or inductances for specific applications or functions for non-linear operation
- H01F38/023—Adaptations of transformers or inductances for specific applications or functions for non-linear operation of inductances
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/45—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of non-linear magnetic or dielectric devices
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- Radar, Positioning & Navigation (AREA)
- Inverter Devices (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
791,905. Circuits employing bi-stable magnetic elements. STANDARD TELEPHONES & CABLES, Ltd. Dec. 31, 1954, No. 37787/54. Class 40 (4). When a core having a substantially rectangular hysteresis loop is in a remanent condition in one direction of magnetism and a voltage is applied to an input winding in such a direction as to drive the core towards saturation in the other direction, the current through the winding inherently remains at a substantially constant and limited value during the time in which the core is changing its magnetic condition along the vertical portion of the hysteresis loop. As soon as the saturation condition is reached, an immediate increase in current takes place. The limited current period may be repeated by resetting the core, either by the use of a further winding or by reversing the voltage, control being effected over an electronic circuit. By connecting a load to an output winding on the core, a constant load current having an amplitude determined by the load and of limited duration is obtained which has the effect of increasing the transient input current. A constant current load transient is also obtained when the core is reset, but since its direction is reversed, suppression by a half-wave rectifier may be necessary. The amplitudes of the load and input currents may be limited to a constant value, whatever the value of the load, by connecting a winding of a second core 8, Fig. 4, in series with the input winding of the first core 9. In this case the second core has a rectangular hysteresis loop but this requirement in the first core is not essential. The second core has either fewer turns or an increased core length so that the changeover current of core 8 is higher than that of core 9. Core 8 also has a smaller crosssection so that it has the shorter switching time of the two cores. The load current produced during changeover of the cores is then limited, in the primary circuit, by the changeover current of core 8, the voltage being removed before this core saturates. For a constant load current it is essential that the load resistance does not exceed a critical value, Fig. 5 (not shown). A suggested application for the circuit is the formation of a pulse of definite amplitude from a master pulse of longer duration. In an alternative arrangement, Fig. 6, three cores 10, 11, 12 having different rectangular hysteresis characteristics produce a series of three staggered pulses which may have different amplitudes. Such an arrangement may be used as a distributer or to provide certain types of pattern movement for shifting registers and counters. The cores are arranged with their input windings in series and are selected such that an applied voltage causes one core to take a constant transient current which is below that needed to commence flux changeover in any of the other cores. When flux transition of the first core terminates, the current increases sufficiently to commence transition in a second core. Similarly, after a further time interval, a further increase in current triggers a third core. Thus a stepped input current pattern is obtained as shown in upper part of Fig. 7, while the individual output windings each produce a pulse in a different time position as shown in the lower part of the same Figure. The cores 10, 11, 12 may have non-rectangular characteristics, in which case a current-limiting core of rectangular characteristic and longer changeover time is connected in series. In a modification, the three cores can be arranged to commence changeover at the same value of current, and saturate at different times, so as to produce three output pulses commencing at the same time and of different lengths.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE544067D BE544067A (en) | 1954-12-31 | ||
GB37787/54A GB791905A (en) | 1954-12-31 | 1954-12-31 | Improvements in or relating to circuit arrangements for producing substantially constant currents |
CH352389D CH352389A (en) | 1954-12-31 | 1955-12-13 | Circuit arrangement for generating an electrical current |
US554074A US2939019A (en) | 1954-12-31 | 1955-12-19 | Circuit arrangements for producing substantially constant currents |
DEI11076A DE1057169B (en) | 1954-12-31 | 1955-12-23 | Circuit arrangement for generating pulses |
FR56430A FR73322E (en) | 1954-12-31 | 1955-12-29 | Magnetic materials |
JP14056A JPS324380B1 (en) | 1954-12-31 | 1956-01-04 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB37787/54A GB791905A (en) | 1954-12-31 | 1954-12-31 | Improvements in or relating to circuit arrangements for producing substantially constant currents |
Publications (1)
Publication Number | Publication Date |
---|---|
GB791905A true GB791905A (en) | 1958-03-12 |
Family
ID=10399000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB37787/54A Expired GB791905A (en) | 1954-12-31 | 1954-12-31 | Improvements in or relating to circuit arrangements for producing substantially constant currents |
Country Status (7)
Country | Link |
---|---|
US (1) | US2939019A (en) |
JP (1) | JPS324380B1 (en) |
BE (1) | BE544067A (en) |
CH (1) | CH352389A (en) |
DE (1) | DE1057169B (en) |
FR (1) | FR73322E (en) |
GB (1) | GB791905A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3098157A (en) * | 1957-12-23 | 1963-07-16 | Kodusai Denshin Denwa Kabushik | Logical element |
US3054044A (en) * | 1959-12-30 | 1962-09-11 | Ibm | Temperature sensing circuit |
US3204177A (en) * | 1961-11-02 | 1965-08-31 | Michel Adolf | Keying devices, particularly for electrical musical instruments |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2375609A (en) * | 1940-05-23 | 1945-05-08 | Zuhlke Marcel | Arrangement for protecting circuit breakers |
US2730694A (en) * | 1951-02-02 | 1956-01-10 | Ferranti Ltd | Amplitude recording system utilizing saturable core reactors |
US2758221A (en) * | 1952-11-05 | 1956-08-07 | Rca Corp | Magnetic switching device |
BE533466A (en) * | 1953-11-20 | |||
NL202884A (en) * | 1954-12-17 |
-
0
- BE BE544067D patent/BE544067A/xx unknown
-
1954
- 1954-12-31 GB GB37787/54A patent/GB791905A/en not_active Expired
-
1955
- 1955-12-13 CH CH352389D patent/CH352389A/en unknown
- 1955-12-19 US US554074A patent/US2939019A/en not_active Expired - Lifetime
- 1955-12-23 DE DEI11076A patent/DE1057169B/en active Pending
- 1955-12-29 FR FR56430A patent/FR73322E/en not_active Expired
-
1956
- 1956-01-04 JP JP14056A patent/JPS324380B1/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
DE1057169B (en) | 1959-05-14 |
JPS324380B1 (en) | 1957-06-29 |
FR73322E (en) | 1960-11-30 |
US2939019A (en) | 1960-05-31 |
BE544067A (en) | 1900-01-01 |
CH352389A (en) | 1961-02-28 |
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