GB988359A - Improvements in or relating to frequency changers - Google Patents
Improvements in or relating to frequency changersInfo
- Publication number
- GB988359A GB988359A GB1721461A GB1721461A GB988359A GB 988359 A GB988359 A GB 988359A GB 1721461 A GB1721461 A GB 1721461A GB 1721461 A GB1721461 A GB 1721461A GB 988359 A GB988359 A GB 988359A
- Authority
- GB
- United Kingdom
- Prior art keywords
- windings
- transformers
- cores
- output
- phase
- 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
- 238000004804 winding Methods 0.000 abstract 11
- 238000010304 firing Methods 0.000 abstract 1
- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
Classifications
-
- 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
- H02M5/02—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 without intermediate conversion into DC
- H02M5/04—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 without intermediate conversion into DC by static converters
- H02M5/22—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 without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/25—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 without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/27—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 without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency
- H02M5/271—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 without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency from a three phase input voltage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Ac-Ac Conversion (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
988,359. Transformers. LEAR SIEGLER Inc. May 11, 1961, No. 17214/61. Heading H1T. [Also in Division H2] A pulse generator (Fig. 2) for a static frequency changer (see Division H2) comprises a set of six saturable transformers 1<SP>1</SP>-6<SP>1</SP> for each half phase of the output supply. The transformers have toroidal cores of square loop material and each has four input windings, for example 50, 51, 52 and 53 and an output winding 54. The cores are saturated in one direction or the other except when the algebraic sum of the ampere turns in the input windings is substantially zero. An output is generated in an output winding only when the associated core switches from one direction of saturation to another. The windings 50 and 60 are connected in series between the phase voltage a<SP>11</SP>, n<SP>11</SP> and the windings 51 and 61 in series between the lines a<SP>1</SP>, c<SP>1</SP> such that the current in the windings 51 and 61 lags 120 degrees behind the current in phase I<SP>1</SP>, 90 degrees of the lag being due to the inductor 67a. The windings 53 and 63 are provided so that one group of rectifiers of the frequency changer do not fire when the other group are conducting and the windings 52 and 62 provide feedback to slightly advance the firing point in order to eliminate commutating overlap. A modified pulse generator (Fig. 6, not shown) has the input windings differently connected, for example the windings 50 and 60 are supplied from phases a<SP>11</SP>, b<SP>11</SP>, c<SP>11</SP> on cores 1 and 2, 3 and 4, 5 and 6 respectively, but operates in a similar manner to the generator described above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1721461A GB988359A (en) | 1961-05-11 | 1961-05-11 | Improvements in or relating to frequency changers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1721461A GB988359A (en) | 1961-05-11 | 1961-05-11 | Improvements in or relating to frequency changers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB988359A true GB988359A (en) | 1965-04-07 |
Family
ID=10091232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1721461A Expired GB988359A (en) | 1961-05-11 | 1961-05-11 | Improvements in or relating to frequency changers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB988359A (en) |
-
1961
- 1961-05-11 GB GB1721461A patent/GB988359A/en not_active Expired
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