US3711747A - Power transformer primary winding fuse arrangement - Google Patents

Power transformer primary winding fuse arrangement Download PDF

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Publication number
US3711747A
US3711747A US3711747DA US3711747A US 3711747 A US3711747 A US 3711747A US 3711747D A US3711747D A US 3711747DA US 3711747 A US3711747 A US 3711747A
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United States
Prior art keywords
primary windings
voltage
power supply
transformer
power transformer
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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
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English (en)
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H Sahara
K Yamakawa
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Sony Corp
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Sony Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
    • 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
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases

Definitions

  • ABSTRACT A power supply for use with different AC line voltages, which includes a power transformer having a plurality of separate primary windings and a corresponding plurality of fuses connected thereto.
  • the primary windings are connected to each other in several different ways to change the turns ratio of the power transformer depending upon the value of the voltage supplied thereto.
  • a predetermined voltage is produced in the secondary winding of the transformer irrespective of the value of the supplied AC line voltage and the current flowing through each of the fuses is held substantially constant, during normal operating conditions, regardless of the manner in which the separate primary windings are connected.
  • This invention relates generally to powersupply devices, and particularly to power supply devices for supplying a predetermined voltage to a load and which is designed to work with commercial AC power lines of differing voltage.
  • One method that has been used is to make the power transformer with a plurality of separate primary windings and to change the connections of these windings to alter the turns ratio between the primary and secondary of the transformer, in response to the line voltage supplied thereto, thereby obtaining a predetermined output voltage at the secondary winding.
  • a fuse is interposed between the primary winding of the power transformer and the AC line for the protection of the apparatus and, when an abnormally high current flows therethrough, the fuse is broken to terminate the supply of power to the transformer.
  • the primary windings are interconnected to match the value of the line voltage, the impedance of the primary also varies, so that the current normally flowing in the fuse varies depend ing upon the voltage of the line.
  • the value of the current which will blow the fuse also varies with the line voltage employed, and consequently the load connected to the power supply cannot be sufficiently protected by a single, common fuse. Therefore, in the prior art, the fuse must be replaced, in accordance with the voltage of the AC mains employed, and, if the replacement of the fuse is forgotten, the load is likely to be, damaged if a fault condition occurs which is insufficient to blow the fuse, but which is high enough to damage the load.
  • FIG. 1 is a diagram showing the construction of one example of a power supply according to this invention.
  • FIGS. 2 and 3 are connection diagrams, for explaining the operation of the device shown in FIG. 1.
  • FIG. 4 is a diagram showing the construction of a modified form of this invention.
  • FIGS. 5, 6, 7, and 8 are connection diagrams, for explaining the operation of the device in FIG. 4.
  • the power supply includes a power transformer comprising a plurality of primary windings having substantially the same number of turns, each of which is connected, at one end, to a first terminal, and at the other end to a second terminal through a fuse, and these terminals are selectively connected to one another to place the primary windings in parallel or in series, to thereby change the turns ratio of the transformer.
  • FIGS. 1, 2 and 3 a detailed description will be given of one example of a power supply according to this invention and which is capable of working with two different line voltages, for example, 1 10V and 220V AC.
  • reference numeral 1 indicates a load, such as a radio receiver, a television receiver, or the like, 2 a power transformer therefor, 3 a power switch, 5 a connecting plug to a commercial AC source and 6 some suitable means for selectively changing the interconnection of the primary windings of transformer 2.
  • the primary winding 7 of the power transformer 2 is comprised of two independent primary windings 7a'and 7b, which are connected, at one end, to terminals t and t, of changing means 6, and at the other ends, to terminals t and t, of changing means 6 through a pair of fuses 9 and 10, respectively.
  • the connecting plug 5 is connected to a terminal T and to a terminal T through the power switch 3.
  • the number of turns on the secondary winding 8 of transformer 2 is suitably selected so that a predetermined output voltage is derived across the secondary winding 8 connected to the load 1.
  • terminal T is connected to terminals t and t and terminal T is connected to terminals t and t.,, as shown in FIG. 2, by operating changing means 6 to provide a parallel connection of the two primary windings 7a and 7b, by which connection the turns ratio of the transformer 2 is increased to establish a predetermined voltage across the secondary winding 8.
  • terminals T T and t are respectively connected to terminals t t and i as shown in FIG. 3, by similarly operating changing means 6 to connect the two windings 7a and 7b in series, thereby lowering the turns ratio of the transformer 2 to obtain the same predetermined voltage across the secondary winding 8.
  • FIG. 4 shows another embodiment of this invention, in which the power supply device is adapted to be operable with four different commercial AC voltages, for example, 100V, 117V, 220V, and 240V.
  • the power supply device is adapted to be operable with four different commercial AC voltages, for example, 100V, 117V, 220V, and 240V.
  • FIG. 4 similar elements to those shown in FIG. 1 are identified by the same reference numerals and no further detailed description will be given.
  • terminals t and z are connected to taps on the windings 7a and 7b, respectively.
  • terminal T When plug 5 is connected to a commercial AC supply of 100V, terminal T, is connected to terminals 1 and t and terminal T is connected to terminals t and t,, as shown in FIG. 5, by operating the changing means 6, to derive a predetermined voltage across the secondary winding 8 of power transformer 2.
  • plug 5 is connected to a power source of 117V
  • terminal T is connected to terminals t
  • t and terminal T is connected to terminals t and as shown in FIG. 6, to derive the same predetermined voltage from the secondary winding 8.
  • terminals T, and T are connected to terminals r, and t respectively, and terminal t is connected to terminal t,,, as shown in FIG. 7, to again derive the same predetermined voltage from the secondary winding 8.
  • terminals T, and T are connected to terminals 1, and t,,, respectively and terminal t is connected to terminal as shown in FIG. 8, to derive the same predetermined voltage on the secondary winding 8.
  • the currents flowing in fuses 9 and 10 are substantially constant, irrespective of the line voltage supplied to plug 5, so that the same results obtained with the circuit of FIG. 1 can be obtained with the circuit of FIG. 4.
  • a power supply for use with input voltages of differing magnitude comprising; a power transformer having a secondary winding and a plurality of separate primary windings, said primary windings being interconnected to supply a predetermined operating voltage to an external load; means for supplying a source of AC voltage to said plurality of primary windings; means for selectively changing the interconnection of said primary windings, to maintain said predetermined operating voltage when said source of AC voltage is of differing magnitude; and a plurality of fuse means, a separate one of said fuse means being connected, in series, between each of said separate primary windings and said changing means.
  • each of said separate primary windings is provided with at least one intermediate winding tap.
  • said changing means includes means for selectively changing the turns ratio of said power transformer to correspond to predetermined magnitudes of the AC voltage supplied to the primary windings, thereby providing a substantially constant voltage at the output of the power supply, irrespective of the magnitude of said AC voltage.
  • a power supply for use with any one of a plurality of different AC input voltages, said power supply comprising; a power transformer having a secondary winding and at least two separate primary windings each having the same number of turns; means for supplying a source of AC voltage to said two primary windings; means for changing the connecting relationship between said two primary windings; and at least two fuse means respectively connected in series between each of said two primary windings and said changing means.
  • each of said two primary windings has a terminal connecting to an intermediate tap on said winding.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Ac-Ac Conversion (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Housings And Mounting Of Transformers (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Television Receiver Circuits (AREA)
  • Protection Of Generators And Motors (AREA)
  • Fuses (AREA)
  • Control Of Electrical Variables (AREA)
  • Circuits Of Receivers In General (AREA)
US3711747D 1970-08-13 1971-08-10 Power transformer primary winding fuse arrangement Expired - Lifetime US3711747A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8094170U JPS50497Y1 (enrdf_load_stackoverflow) 1970-08-13 1970-08-13

Publications (1)

Publication Number Publication Date
US3711747A true US3711747A (en) 1973-01-16

Family

ID=13732489

Family Applications (1)

Application Number Title Priority Date Filing Date
US3711747D Expired - Lifetime US3711747A (en) 1970-08-13 1971-08-10 Power transformer primary winding fuse arrangement

Country Status (6)

Country Link
US (1) US3711747A (enrdf_load_stackoverflow)
JP (1) JPS50497Y1 (enrdf_load_stackoverflow)
CA (1) CA936231A (enrdf_load_stackoverflow)
DE (1) DE2140034A1 (enrdf_load_stackoverflow)
FR (1) FR2102247B1 (enrdf_load_stackoverflow)
GB (1) GB1351008A (enrdf_load_stackoverflow)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855521A (en) * 1972-05-24 1974-12-17 Sony Corp Transformer having switch means for causing series or parallel connection between plural primary or secondary winding
US3938031A (en) * 1974-09-03 1976-02-10 Robicon Corporation Adjustable voltage power supply
US4151575A (en) * 1977-03-07 1979-04-24 Hogue Maurice A Motor protective device
US4249696A (en) * 1979-05-11 1981-02-10 Emerson Electric Co. Charging circuit for battery in thermostat with battery operated timer
US4678986A (en) * 1982-05-25 1987-07-07 Louis Barthelemy Electric transformer with selectively energized modular circuits
US5319854A (en) * 1991-05-28 1994-06-14 Pracht Guenther Scissors
US6212430B1 (en) 1999-05-03 2001-04-03 Abiomed, Inc. Electromagnetic field source with detection of position of secondary coil in relation to multiple primary coils
US6496563B1 (en) 1999-09-27 2002-12-17 Christopher M Bacon X-ray tube driver
US20050140336A1 (en) * 2003-12-26 2005-06-30 Fuji Jukogyo Kabushiki Kaisha Voltage equalizer for battery elements
EP2551862A1 (de) * 2011-07-29 2013-01-30 AEG Power Solutions B.V. Stromversorgungsanordnung mit Mitteln zur Spannungserhöhung
US8620447B2 (en) 2011-04-14 2013-12-31 Abiomed Inc. Transcutaneous energy transfer coil with integrated radio frequency antenna
US8766788B2 (en) 2010-12-20 2014-07-01 Abiomed, Inc. Transcutaneous energy transfer system with vibration inducing warning circuitry
JP2014123539A (ja) * 2012-11-26 2014-07-03 Panasonic Corp 誘導加熱装置およびそれを用いた炊飯器
US20140285302A1 (en) * 2013-03-19 2014-09-25 Munsu SIN High voltage transformer
US9002469B2 (en) 2010-12-20 2015-04-07 Abiomed, Inc. Transcutaneous energy transfer system with multiple secondary coils
US9002468B2 (en) 2011-12-16 2015-04-07 Abiomed, Inc. Automatic power regulation for transcutaneous energy transfer charging system
US9220826B2 (en) 2010-12-20 2015-12-29 Abiomed, Inc. Method and apparatus for accurately tracking available charge in a transcutaneous energy transfer system
CZ305925B6 (cs) * 2015-04-20 2016-05-04 České vysoké učení technické v Praze, Fakulta dopravní Zapojení transformátorového zdroje s velkým vstupním rozsahem
US20160307695A1 (en) * 2014-03-19 2016-10-20 Ionel Jitaru Magnetic structures for low leakage inductance and very high efficiency
US9673716B2 (en) * 2015-06-26 2017-06-06 Lite-On Technology Corp. Resonant converter with three switches
US11448687B2 (en) * 2016-08-17 2022-09-20 Ge Aviation Systems Limited Method and apparatus for detecting an electrical fault in a printed circuit board

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2326608C2 (de) * 1973-05-24 1985-05-02 Sony Corp., Tokio/Tokyo Spannungswähler

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1291078A (en) * 1915-02-27 1919-01-14 Gen Electric Method and means for the operation of electrical apparatus.
US1831886A (en) * 1929-11-11 1931-11-17 Julian J Ross Transformer
US3084308A (en) * 1960-01-05 1963-04-02 Hewlett Packard Co Electrical apparatus
US3617967A (en) * 1970-04-14 1971-11-02 Electromagnetic Ind Inc Current transformer having primary side switchable to different measuring ranges

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1447120A (fr) * 1961-11-08 1966-07-29 Perfectionnement apporté aux répartiteurs de tension

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1291078A (en) * 1915-02-27 1919-01-14 Gen Electric Method and means for the operation of electrical apparatus.
US1831886A (en) * 1929-11-11 1931-11-17 Julian J Ross Transformer
US3084308A (en) * 1960-01-05 1963-04-02 Hewlett Packard Co Electrical apparatus
US3617967A (en) * 1970-04-14 1971-11-02 Electromagnetic Ind Inc Current transformer having primary side switchable to different measuring ranges

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3855521A (en) * 1972-05-24 1974-12-17 Sony Corp Transformer having switch means for causing series or parallel connection between plural primary or secondary winding
US3938031A (en) * 1974-09-03 1976-02-10 Robicon Corporation Adjustable voltage power supply
US4151575A (en) * 1977-03-07 1979-04-24 Hogue Maurice A Motor protective device
US4249696A (en) * 1979-05-11 1981-02-10 Emerson Electric Co. Charging circuit for battery in thermostat with battery operated timer
US4678986A (en) * 1982-05-25 1987-07-07 Louis Barthelemy Electric transformer with selectively energized modular circuits
US5319854A (en) * 1991-05-28 1994-06-14 Pracht Guenther Scissors
US6212430B1 (en) 1999-05-03 2001-04-03 Abiomed, Inc. Electromagnetic field source with detection of position of secondary coil in relation to multiple primary coils
US6366817B1 (en) 1999-05-03 2002-04-02 Abiomed, Inc. Electromagnetic field source device with detection of position of secondary coil in relation to multiple primary coils
US6400991B1 (en) 1999-05-03 2002-06-04 Abiomed, Inc. Electromagnetic field source method with detection of position of secondary coil in relation to multiple primary coils
US6496563B1 (en) 1999-09-27 2002-12-17 Christopher M Bacon X-ray tube driver
US20050140336A1 (en) * 2003-12-26 2005-06-30 Fuji Jukogyo Kabushiki Kaisha Voltage equalizer for battery elements
US7400114B2 (en) * 2003-12-26 2008-07-15 Fuji Jukogyo Kabushiki Kaisha Voltage equalizer for battery elements
US9002469B2 (en) 2010-12-20 2015-04-07 Abiomed, Inc. Transcutaneous energy transfer system with multiple secondary coils
US8766788B2 (en) 2010-12-20 2014-07-01 Abiomed, Inc. Transcutaneous energy transfer system with vibration inducing warning circuitry
US9220826B2 (en) 2010-12-20 2015-12-29 Abiomed, Inc. Method and apparatus for accurately tracking available charge in a transcutaneous energy transfer system
US8620447B2 (en) 2011-04-14 2013-12-31 Abiomed Inc. Transcutaneous energy transfer coil with integrated radio frequency antenna
CN102904456A (zh) * 2011-07-29 2013-01-30 安奕极电源系统有限责任公司 具有用于升高电压的机构的电源装置
EP2551862A1 (de) * 2011-07-29 2013-01-30 AEG Power Solutions B.V. Stromversorgungsanordnung mit Mitteln zur Spannungserhöhung
US9002468B2 (en) 2011-12-16 2015-04-07 Abiomed, Inc. Automatic power regulation for transcutaneous energy transfer charging system
JP2014123539A (ja) * 2012-11-26 2014-07-03 Panasonic Corp 誘導加熱装置およびそれを用いた炊飯器
US20140285302A1 (en) * 2013-03-19 2014-09-25 Munsu SIN High voltage transformer
US20160307695A1 (en) * 2014-03-19 2016-10-20 Ionel Jitaru Magnetic structures for low leakage inductance and very high efficiency
CZ305925B6 (cs) * 2015-04-20 2016-05-04 České vysoké učení technické v Praze, Fakulta dopravní Zapojení transformátorového zdroje s velkým vstupním rozsahem
US9673716B2 (en) * 2015-06-26 2017-06-06 Lite-On Technology Corp. Resonant converter with three switches
US11448687B2 (en) * 2016-08-17 2022-09-20 Ge Aviation Systems Limited Method and apparatus for detecting an electrical fault in a printed circuit board

Also Published As

Publication number Publication date
DE2140034A1 (de) 1972-02-17
FR2102247A1 (enrdf_load_stackoverflow) 1972-04-07
FR2102247B1 (enrdf_load_stackoverflow) 1976-05-28
CA936231A (en) 1973-10-30
JPS50497Y1 (enrdf_load_stackoverflow) 1975-01-09
GB1351008A (en) 1974-04-24

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