US3771042A - Pulse transformer for controlled rectifier - Google Patents

Pulse transformer for controlled rectifier Download PDF

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Publication number
US3771042A
US3771042A US00162087A US3771042DA US3771042A US 3771042 A US3771042 A US 3771042A US 00162087 A US00162087 A US 00162087A US 3771042D A US3771042D A US 3771042DA US 3771042 A US3771042 A US 3771042A
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United States
Prior art keywords
screen
core
windings
secondary windings
pulse transformer
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Expired - Lifetime
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US00162087A
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English (en)
Inventor
W Faust
C Beriger
H Bossi
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BBC Brown Boveri AG Switzerland
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Bbc Brown Boveri & Cie
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/16—Toroidal 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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/06—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/068—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer
    • 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
    • H01F29/14—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias
    • H01F2029/143—Variable transformers or inductances not covered by group H01F21/00 with variable magnetic bias with control winding for generating magnetic bias

Definitions

  • a transformer structure for producing pulses for igniting a chain of controlled rectifier units such as thyristors includes a primary winding consisting of one or more turns on which a number of toroidally configured iron cores are threaded. Each core is provided with at least two groups of secondary windings in which voltages are induced as a result of the alternating current which passes through the primary winding, and these voltages are applied to the, control electrodes of the thyristors for igniting them.
  • a system of screens is used to screen the secondary windings from the core.
  • a screen first located adjacent the secondary windings has a width whichis variable over the circumference of the core and does not completely screen the seondary windings from the core whereas 1a second screen located adjacent the core, i.e., between the core and the first screen completely surrounds the core and is of constant width.
  • the first screen is electrically connectd RECTIFIER [75] Inventors: Werner Faust, Wettingen; Conrad Beri'ger, Aarau; Hans Jiirg Bossi, Nussbaumen, all of Switzerland [73] Assignee: Aktiengesellschaft Brown, Boveri & Cie., Baden, Switzerland July 13, 1971 21 Appl. No.: 162,087
  • the invention relates to a pulse transformer for a controlled rectifier containing, for example, a chain of thyristors, the transformer having a toroid core and at least two groups of secondary windings which function as control windings on the core.
  • FIG. I is the known capacitive substitution circuit diagram of a pulse transformer connected to a thyristor chain
  • FIG. 2A is an equivalent capacitive circuit diagram of a pulse transformer provided with double screening
  • FIG. 2B is the substitution circuit diagram of, the
  • FIG. 3 is a section through the wound toroid core of a pulse transformer; provided with a multiple screen arragement in accordance with the invention
  • FIG. 4 is a view in plan which shows a construction of a pulse transformer having multiple screens arranged between the core and secondary'coils according to a first embodiment of the invention
  • FIG. 5 shows graphically the dimensions of a screening element relative to thenumber of turns on a wound toroid core
  • FIG. 6 is a partial plan view of the transformer core illustrating a modified embodiment for the screen component 3 of the FIG. 4 embodiment
  • FIG. 7 shows a section through a further embodiment of a wound .toroid core of a pulse transformer provided with multiple screens according to the invention.
  • FIG. 8 shows a section through another embodiment of wound toroid core of a pulse transformer provided with multiple screens according to the invention.
  • a pulse transformer is used to control a chain of serially connected thyristors l of a controlled thyristor rectifier as shown in FIG. 1.
  • the transformer usually comprises a primary winding turn or turns on which a number of wound toroid cores with windings are threaded.
  • Each toroid core is provided with a number of secondary windings, for example 28, each of which is used to control a thyristor.
  • Each secondary winding has a capacitance relative to the toroid core, the core being at a mean voltage value.
  • the corresponding capacitance substitution circuit for such a system is shown in FIG. 1.
  • the capacitances between the windings and the toroid core can be considered as providing parallel capacitances C, and series capacitances C and these together result in an irregular voltage distribution along the thyrsitor chain, such irregularity being the greater, the higher the ratio of parallel capacitance C to the serial capacitance C
  • the irregular voltage or rate of change of voltage du/dt along the chain should remain as small as possible and should not exceed, for example, 30 percent, even if the serial capacitance C of the thyristors l is relatively small. This can be achieved by providing each toroid core with two screens.
  • FIGS. 2A and 2B show such an example.
  • the first screen 3 being arranged near the control windings and being of a width which is variable over the circumference of the toroid core, does not completely screen the control windings whereas the second screen 4 being arranged at such a distance from the control windings which allows intermediate arrangement of the first screen, completely surrounds the toroid core at constant width.
  • One part of the capacitance of the control winding is transferred to the first screen and the other part to the second screen.
  • the first screen 3 is at the potential of the remote end of one group or chain of control windings or the respective thyristor of the chain as shown in FIG. 2A.
  • the second screen 4 is connected by a terminal to the mid potential junction 10 of the chain as shown. The capacitive effect of the second screen on the control windings progressively increases from the two end-thyristor windings in the direction of the mid-potential terminal of the second screen.
  • the capacitive substitution circuit diagram of this system referred to the thyristor chain is shown in FIG. 28.
  • Each control winding is associated with two capacitances, one capacitance C (n l, 2, m) relative to the first screen and the. other capacitance C relative to the second screen.
  • the substitution circuit diagram contains two further capacitances C,, and C representing the influence of stray capacitances which become externally effective. These capacitances may influence the values of the capacitances C and for this reason they are appropriately included into the calculation of these capacitances.
  • the capacitance values for the first screen are so selected that the capacitive effect on. the thyristor column is cancelled by the second screen and by theexternal stray capacitances. No irregular voltage distribution occurs when the capacitances are completely compensated in this way.
  • FIG. 4 shows a plan view indicating the position of the screens and the windings. It can be readily seen that the width of the first screen 3 varies from winding to winding.
  • FIG. 5 shows the width L of the screens plotted relative to the number of windings n for an actual embodiment.
  • the circumference is developed onto a plane.
  • the manner in which the width L; of the first screen 3 varies with the number of windings while the width L, of the second screen 4 remains constant can also be readily seen by reference to this illustration.
  • FIG. 6 illustrates a modified embodiment for the variable-width screen component 3 included in the embodiment of FIG. 4.
  • the equivalent screen is seen to be a winding 12 which is wound around the screen 4 in such manner that the number of individual turns of the winding between adjacent secondary coils 2 of the winding group progressively increases in the direction away from the connection terminal of the screen 4 to the junction between two groups of windings.
  • FIG. 7 shows a further example.
  • the windings 2 are screened on both sides by duplicated first screens 3. This arrangement is appropriate if the external capacitances of the control windings could give rise to a disturbing effect.
  • FIG. 8 shows an embodiment similar to that of FIG. 3.
  • the first first screen 3 is provided radially inwards of the winding 2.
  • a further screen 6, having the same potential as the second screen 4, is disposed radially outwards of the first screen 3 on the other side of the winding 2.
  • the influence of the capacitances of the control windings relative to the further screen 6 is compensated by appropriately shaping of the first screen 3.
  • Undesirable external capacitances are compensated where necessary by externally disposed shrouds 7.
  • the system described hereinabove improves the efficiency and reduces the cost of thyristor rectifier control.
  • the du/dr stress caused by changing voltages on the thyristors is reduced by using the screens. This means that cheaper thyristors and smaller du/dt chokes for limiting the effect of the voltage changes along the rectifier chain can be used.
  • a pulse transformer arrangement for and controlling the operation of semiconductor switching elements such as thyristors, the combination comprising a toroidal core, secondary windings surrounding said core, said secondary windings being distributed circumferentially about said core and arranged in first and second groups, a chain of thyristors connected in series.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Power Conversion In General (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Rectifiers (AREA)
US00162087A 1970-07-20 1971-07-13 Pulse transformer for controlled rectifier Expired - Lifetime US3771042A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1098270A CH519271A (de) 1970-07-20 1970-07-20 Impulsübertrager für einen gesteuerten Gleichrichter

Publications (1)

Publication Number Publication Date
US3771042A true US3771042A (en) 1973-11-06

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ID=4368811

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Application Number Title Priority Date Filing Date
US00162087A Expired - Lifetime US3771042A (en) 1970-07-20 1971-07-13 Pulse transformer for controlled rectifier

Country Status (8)

Country Link
US (1) US3771042A (de)
JP (1) JPS473219A (de)
CA (1) CA955997A (de)
CH (1) CH519271A (de)
DE (2) DE2043922A1 (de)
FR (1) FR2103055A5 (de)
GB (1) GB1322489A (de)
SE (1) SE366144B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5736916A (en) * 1995-06-07 1998-04-07 Kollmorgen Corporation High frequency pulse transformer for an IGBT gate drive

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5636563B2 (de) * 1972-09-22 1981-08-25
JPS5648168A (en) * 1979-09-28 1981-05-01 Chiyou Lsi Gijutsu Kenkyu Kumiai Semiconductor integrated circuit unit and its preparation
NL8104862A (nl) * 1981-10-28 1983-05-16 Philips Nv Halfgeleiderinrichting, en werkwijze ter vervaardiging daarvan.
JPS59172738A (ja) * 1983-03-22 1984-09-29 Sanyo Electric Co Ltd 縦型ｐｎｐトランジスタ
JPH0734448A (ja) * 1993-07-26 1995-02-03 P S Co Ltd コンクリ−ト中空矢板、その打込治具及び打込施工方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1962379A (en) * 1933-03-29 1934-06-12 Westinghouse Electric & Mfg Co Electrical apparatus
US2462106A (en) * 1945-04-27 1949-02-22 Int Standard Electric Corp Electric transformer
US2896096A (en) * 1953-03-17 1959-07-21 Schwarzer Fritz Power supply
US3398349A (en) * 1965-10-20 1968-08-20 Westinghouse Electric Corp Encased high voltage electrical converter of the semiconductor type
US3611106A (en) * 1970-03-05 1971-10-05 Gen Motors Corp Fast rise two-transistor controlled rectifier trigger circuitry with control circuit isolation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1962379A (en) * 1933-03-29 1934-06-12 Westinghouse Electric & Mfg Co Electrical apparatus
US2462106A (en) * 1945-04-27 1949-02-22 Int Standard Electric Corp Electric transformer
US2896096A (en) * 1953-03-17 1959-07-21 Schwarzer Fritz Power supply
US3398349A (en) * 1965-10-20 1968-08-20 Westinghouse Electric Corp Encased high voltage electrical converter of the semiconductor type
US3611106A (en) * 1970-03-05 1971-10-05 Gen Motors Corp Fast rise two-transistor controlled rectifier trigger circuitry with control circuit isolation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5736916A (en) * 1995-06-07 1998-04-07 Kollmorgen Corporation High frequency pulse transformer for an IGBT gate drive
USRE38082E1 (en) 1995-06-07 2003-04-22 Kollmorgen Corporation High frequency pulse transformer for an IGBT gate drive

Also Published As

Publication number Publication date
CA955997A (en) 1974-10-08
SE366144B (de) 1974-04-08
FR2103055A5 (de) 1972-04-07
JPS473219A (de) 1972-02-17
DE2043922A1 (de) 1972-03-09
GB1322489A (en) 1973-07-04
CH519271A (de) 1972-02-15
DE7033044U (de) 1972-08-10

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