GB690195A - Improvements in and relating to control circuits for electric converting systems - Google Patents
Improvements in and relating to control circuits for electric converting systemsInfo
- Publication number
- GB690195A GB690195A GB29087/50A GB2908750A GB690195A GB 690195 A GB690195 A GB 690195A GB 29087/50 A GB29087/50 A GB 29087/50A GB 2908750 A GB2908750 A GB 2908750A GB 690195 A GB690195 A GB 690195A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- reactors
- current
- main winding
- voltage
- 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
-
- 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
- H02M7/046—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Particle Accelerators (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
690,195. Converting. BRITISH THOMSON-HOUSTON CO., Ltd. Nov. 28, 1950 [Dec. 7, 1949], No. 29087/50. Class 38 (ii). An electric converting system interposed between an A.C. and a D.C. circuit or vice versa, includes means. such as saturable reactors arranged to control the rate of change of current through the circuit interrupting devices at the end of a conducting period and during the commutating period and includes further means. viz. resistors having non-linear volt-ampere characteristics, for controlling the inverse voltages appearing across the circuit interrupting devices following commutation, thereby to reduce the possibilities of " arc-back." Electron discharge tubes 5-10 are disposed between an A.C. circuit 1 and a D.C. circuit 2, each tube being supplied from a transformer 3 over a main winding of a respective saturable reactor 16, 17 or 18. The discharge vessels 5-10 are caused to operate in the normal fashion by grid control via a phase-shift device 11, transformer 13, and a battery 15 giving the requisite negative bias. The reactors 16, 17, 18 are pre-saturated by means of windings 28, 29, 30 so that the reactors operate to cause the current flowing in an electron discharge device to decay at a relatively slow rate as described in Specification 501,735. Each main winding of the reactors 16, 17, 18 has connected in parallel therewith a resistor 34, having a non-linear volt-ampere characteristic, of the type disclosed in Specification 292,110, [Claas 38 (ii)]. Therefore when the reversal of flux occurs in the core of a saturable reactor the voltage induced in the main winding thereof causes a current to be circulated in the winding and its associated resistor thus delaying the reversal of the flux and allowing such change to continue after current has ceased to flow in the discharge device. This induced voltage is of opposite sense to the inverse voltage appearing across the discharge device following a conductive period thereof, thus causing a reduction of this inverse voltage so preventing " arcback ". In another embodiment there is described a system having mechanical circuit interruption and having resistors 34 similarly associated therewith.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US690195XA | 1949-12-07 | 1949-12-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB690195A true GB690195A (en) | 1953-04-15 |
Family
ID=22086187
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB29087/50A Expired GB690195A (en) | 1949-12-07 | 1950-11-28 | Improvements in and relating to control circuits for electric converting systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB690195A (en) |
-
1950
- 1950-11-28 GB GB29087/50A patent/GB690195A/en not_active Expired
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