US2530011A - Means for producing a constant current - Google Patents

Means for producing a constant current Download PDF

Info

Publication number
US2530011A
US2530011A US769978A US76997847A US2530011A US 2530011 A US2530011 A US 2530011A US 769978 A US769978 A US 769978A US 76997847 A US76997847 A US 76997847A US 2530011 A US2530011 A US 2530011A
Authority
US
United States
Prior art keywords
current
voltage
inductance
transformer
winding
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 - Lifetime
Application number
US769978A
Other languages
English (en)
Inventor
Forssell Harry
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 by ASEA AB filed Critical ASEA AB
Application granted granted Critical
Publication of US2530011A publication Critical patent/US2530011A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/04—Regulating voltage or current wherein the variable is AC
    • G05F3/06—Regulating voltage or current wherein the variable is AC using combinations of saturated and unsaturated inductive devices, e.g. combined with resonant circuit

Definitions

  • a third circuit is, according to the present invention, connected to the source of current, the said circuit containing an inductance with saturable iron and feeding a winding of the same transformer, the ampereturns of which counteract those of the two first-named windings.
  • An ohmic resistance is preferably connected in series with the inductance.
  • FIG. 1 A form of the invention is diagrammatically illustrated in Fig. 1 of the accompanying drawing, which Fig. 2 shows a diagram of its mode of operation.
  • the numeral I designates a pair of alternating current terminals, between which a slightly variable voltage is supposed to exist. Between the said terminals, three parallel current paths are connected which contain, next to one terminal, a constant inductance 2, an inductance 3 containing saturable iron in series with an ohmic resistance II, and a condenser 4 respectively.
  • the constant inductance 2 and the condenser! are connected each to one end of a transformer winding 5, the midpoint of which is connected to the other alternating current terminal. If the ohmic resistances in the current paths through 2 and 4 can be neglected, the currents out requiring any appreciable current.
  • the transformer has a secondary winding 6 which is connected to a load I, in the form shown through a rectifier 8 and smoothening members 9, "I.
  • I a load in this load
  • the variation of current in the load I will be smaller by still another order of magnitude.
  • a small variation of the frequency of the alternating current cause any appreciable fluctuation of the current, but on the other hand, the latter becomes essentially proportional to the voltage between the terminals I.
  • the third current path containing the inductance 3 added according to the present invention reduces, on th other hand, the voltage dependence of the current materially.
  • An exact description of the operation in this respect necessitates a rather circumstantial mathematical treatment, but a survey of the mode of operation is obtained by the diagram shown in Fig. 2.
  • E designates the voltage between the alternating current terminals and E1. and ET two components thereof, namely, the voltage on the inductance 3 with the resistance II and the voltage on the transformer winding connected to the said inductance. It is true that the latter component in reality has not a pure sine shape, but as it is comparatively small, its deviation from such shape can be neglected at this survey.
  • I'r designates the primary current of the transformer dependent on the current paths through 2 and 4. This current is practically in phase with the voltage ET and behind EL. Its curve may therefore also represent the flux in the iron core of the inductance 3 during the time intervals when the current through 3 and II is negligible. It. represents the current through 3 and II
  • the condenser 4 and the inductance 3 be connected directly to one terminal of the voltage source, but they may be connected to one or more intermediary taps on the inductance 2 which then acts as a voltage divider.
  • the members 3, i l, and 4 should then of course be dimensioned with respect to the portion or portions of the inductance 2 lying in parallel thereto.
  • the transformer may The transition oi course bebuilt without a separate secondary winding, and inversely, the winding turns fedthrough the inductance 3 and resistance H may form a separate winding.
  • Means for deriving a substantially constant alternating current from a variable voltage comprising alternating current terminals, a transformer winding composed of a plurality of electromagnetically cooperating parts, a substantially inductive current path and a substantially capacitative current path connected in parallel to said terminals'and each including one of said parts, and a third current path connected to said nating current terminals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Transformers For Measuring Instruments (AREA)
US769978A 1943-02-01 1947-08-21 Means for producing a constant current Expired - Lifetime US2530011A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE239100X 1943-02-01

Publications (1)

Publication Number Publication Date
US2530011A true US2530011A (en) 1950-11-14

Family

ID=20305879

Family Applications (1)

Application Number Title Priority Date Filing Date
US769978A Expired - Lifetime US2530011A (en) 1943-02-01 1947-08-21 Means for producing a constant current

Country Status (4)

Country Link
US (1) US2530011A (ja)
BE (1) BE475019A (ja)
CH (1) CH239100A (ja)
DE (1) DE893369C (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3237089A (en) * 1961-06-21 1966-02-22 Lambda Electronics Corp Means for improving constant voltage transformers
US3435330A (en) * 1965-12-08 1969-03-25 Sola Basic Ind Inc Inductive voltage divider-autotransformer automatic voltage regulating system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1102815B (de) * 1957-10-10 1961-03-23 Zd Y Pruumyslove Automatisace Paralleler Magnetverstaerker mit innerer Rueckkopplung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1985634A (en) * 1928-04-04 1934-12-25 Raytheon Mfg Co Regulating system
US2221456A (en) * 1938-06-16 1940-11-12 Closman P Stocker Electrical regulator
US2351681A (en) * 1942-12-24 1944-06-20 Salle Nat Bank Constant current control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1985634A (en) * 1928-04-04 1934-12-25 Raytheon Mfg Co Regulating system
US2221456A (en) * 1938-06-16 1940-11-12 Closman P Stocker Electrical regulator
US2351681A (en) * 1942-12-24 1944-06-20 Salle Nat Bank Constant current control

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3237089A (en) * 1961-06-21 1966-02-22 Lambda Electronics Corp Means for improving constant voltage transformers
US3435330A (en) * 1965-12-08 1969-03-25 Sola Basic Ind Inc Inductive voltage divider-autotransformer automatic voltage regulating system

Also Published As

Publication number Publication date
DE893369C (de) 1953-10-15
BE475019A (ja)
CH239100A (de) 1945-09-15

Similar Documents

Publication Publication Date Title
US2278151A (en) Regulating apparatus
US1997657A (en) Regulating system
US2403393A (en) Regulator
US2996656A (en) Voltage regulating apparatus
US2682632A (en) Magnetic amplifier circuit
US2207234A (en) Voltage regulating device
US2322130A (en) Electrical regulating apparatus
US3042848A (en) Voltage regulator
US2465451A (en) Saturable reactor regulator
US2547615A (en) Saturable core reactor
US3205425A (en) Voltage stabilized converter devices
US2530011A (en) Means for producing a constant current
US2254899A (en) System for maintaining constant rotational speed of electric machines
US2409610A (en) Voltage regulation
US2844804A (en) Control transformer
US2434493A (en) Voltage stabilizing transformer
US2092859A (en) Electrical regulating apparatus for rectifiers
US2212229A (en) Tension control device
US2869069A (en) Voltage stabilizer and reference circuit therefor
US3209239A (en) Voltage stabilizing equipment for use with a fluctuating a. c. voltage
US3235789A (en) Voltage regulators
US3112440A (en) Ferroresonant voltage stabilizer
US2725518A (en) Voltage error sensing device
US2442960A (en) Regulated rectifying system
US2915645A (en) Magnetic amplifier