US1965416A - Electric valve circuits - Google Patents

Electric valve circuits Download PDF

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Publication number
US1965416A
US1965416A US566376A US56637631A US1965416A US 1965416 A US1965416 A US 1965416A US 566376 A US566376 A US 566376A US 56637631 A US56637631 A US 56637631A US 1965416 A US1965416 A US 1965416A
Authority
US
United States
Prior art keywords
grid
potential
valve
anode
circuit
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
US566376A
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English (en)
Inventor
Howard Alan
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.)
General Electric Co
Original Assignee
General Electric Co
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
Priority to DEA67061A priority Critical patent/DE629683C/de
Priority to FR743345D priority patent/FR743345A/fr
Application filed by General Electric Co filed Critical General Electric Co
Priority to US566376A priority patent/US1965416A/en
Priority to US566374A priority patent/US1937369A/en
Priority to US581396A priority patent/US1961057A/en
Priority to GB27217/32A priority patent/GB400406A/en
Priority claimed from GB2721632A external-priority patent/GB412909A/en
Application granted granted Critical
Publication of US1965416A publication Critical patent/US1965416A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/505—Conversion of DC power input into AC power output without possibility of reversal 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
    • H02M7/51—Conversion of DC power input into AC power output without possibility of reversal 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 using discharge tubes only

Definitions

  • My invention relates to electric valve circuits and more particularly to such circuits including valves of the vapor electric discharge type.
  • the effect of transient positive voltages in the anode circuit of a vapor electric discharge valve on the grid of I, the device, tending to deprive the grid of control over'the conductivityof the valve, is substantially eliminated by connecting between the grid and cathode :of the discharge device a condenser having a :capacitysubstantially-greaterthan the in- *ternal-capacitybetween the gridand anode of the device and/or that between the grid and anode circuits.
  • the potential electrostati'cally'induced upon the control grid of the device tending tosdeprive it of control is reduced to. such :2. value :that its effect is negligible.
  • FIG. 1 of the drawing there is' conventiona'lly illustrated an electric valve of the vapor electric --discharge type comprising an envelope 10, an anode'll, a control grid 12, and a cathode 1 3.
  • the envelope 10 is filled with an ionizing vapor at low pressure; such for example as mercury vapor, argon, neon, 'etc. as is well understood lay-those skilled in the art.
  • the art 'that'the cathode 13 con- 'ventionallyillustrated as of'the hot cathode type may be of "the mercury "pool type if so desired, it '105 onlyfbeingneces'sary that the cathode 13 shall be cOntinuOuSIy eXcited to forin a source of free electrons.
  • the inter-electrode capacities of the anode'and grid'a'nd-the grid and cathode are indic'ated in dotted 'liriesbythe capacitors Op and Cr, respectively.
  • the potential Eg electrostatically induced upon the control grid by variations in the plate potential may be limited to any desired value and may be made negligible compared with the magnitude of the normal grid potential or the negative grid bias potential.
  • FIG. 4 there is illustrated an electric valve converting apparatus embodying my invention of the type known in the art as a parallel inverter, adapted to transmit energy from a direct current supply circuit 16 to an alternating current load circuit 17.
  • This apparatus comprises a transformer 18 having a secondary winding connected to the alternating current circuit 1'7 and a primary winding provided with an electrical midpoint connected to one side of the direct current circuit 16, and, a pair of end terminals connected to the other side of the direct current circuit 16 through vapor electric discharge valves 19 and 20.
  • a commutating capacitor 21 is connected between the electric valves 19 and 20 and, if desired, a smoothing reactor 22 may be connected in the direct current circuit.
  • the vapor electric discharge valves 19 and 20 are each provided with an anode, a cathodeand a control grid for controlling the starting of current in the anode-cathode circuit.
  • the control grids of the valves 19 and 20 are connected to their common cathode circuit through opposite halves of the secondary winding of a grid transformer 23, a negative bias battery 24,- and a current limiting resistor 25.
  • the primary winding of the grid transformer 23 may be energized from any suitable alternating current circuit 26 of the frequency which it is desired to supply to the circuit 1'7, or in case the circuit 17 is connected to an independent source of electromotive force for determining its frequency, the primary winding of the transformer 23 may be energized therefrom through a suitable phase advancing condenser, as will be well understood by those skilled in the art.
  • the grids of the devices 19 and 20 are also connected to their respective cathodes through condensers 27 and 28 anodes of the valves 19 by means of which the grids of the valves are enabled to maintain control of the conductivity of the valve even during the occurrence of positive transients on the anodes of the respective valves.
  • the capacitor 21 will become charged to a potential substantially twice that of the direct current circuit and, when electric valve 20 is made conductive, the potential of this capacitor iseffective to transfer the current from the valve 19 to the valve 20.
  • Current will now flow 100 from the positive side of the direct current circuit, through the right hand portion of the primary winding of the transformer 18 and electric valve 20 to the other side of the direct current circuit. In this manner, the current is successively commutated between the electric valves 19 and 20, flowing in opposite directions through the primary winding of the transformer 18 and thus supplying an alternating potential to the circuit 17.
  • the capacitor 21 may be omitted and the primary winding of the grid transformer energized from the alternating current circuit 17, in which case the electromotive force of the transformer 18 is effective to commutate the current between the electric valves.
  • Fig. 5 there is a copy of an oscillogram of the potential appearing across one of the electric valves in a circuit of the type illustrated in Fig. 4.
  • the portions a of this curve represent the intervals during which the valve is conducting current, so that the potential across the valve is only the arc drop of the valve, which remains substantially constant.
  • the intervals b of this curve represent the periods during which the valve is In case the above described circuit is operating at relatively high voltages, or
  • capacitors 2'1 and 28 which preferably have capacities very large with respect to the capacities between the grids and anodes of the valves, the effect of this inter-electrode capacity is substantially eliminated and the grids of the valves are enabled to maintain control of their conductivities.
  • an electric translating circuit the combination of a plurality of vapor electric discharge devices each provided with an anode, a cathode, and a control grid, the anode and grid of each valve forming a substantial internal capacity, a control circuit for rendering said devices alternately conductive and nonconductive in a predetermined sequence, an electric coupling between the anode-cathode circuits of said devices whereby the interruption of current in one device impresses potential transients on the anode of the nonconductive devices, and capacitive means interconnecting the grid and cathode of eachof said devices to eliminate substantially the effect on the grids of the nonconductive devices of the interruption of the current in a conductive device.
  • a vapor electric discharge device provided with an anode, a cathode, and a control grid, the anode and grid and grid and cathode forming internal capacities of Cp and Cr, respectively, an anode-cathode circuit for said device including a source of high potential transients, having a maximum value of Ep, means for applying a variable control potential to said grid, and capacitive means C: interconnecting said grid and cathode and so proportioned that the term C11 D+ 1+ is substantially less than the normal range of variation of said grid control potential.
  • a vapor electric discharge device provided with an anode, a cathode, and a control grid, the anode and grid and the grid and cathode forming internal capacities of Cp and Cr, respectively, an anode-cathode circuit for said device including a source of high potential transients having a maximum value Ep, means for applying to said grid a negative potential during certain intervals to maintain said device non-conductive, and a capacitor connected between said grid and cathode and having such a value C'r that the term D H" is negligible compared to the normal value of said negative potential.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetically Actuated Valves (AREA)
  • Microwave Tubes (AREA)
  • Particle Accelerators (AREA)
  • Emergency Protection Circuit Devices (AREA)
US566376A 1931-10-01 1931-10-01 Electric valve circuits Expired - Lifetime US1965416A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DEA67061A DE629683C (de) 1931-10-01 Schutzeinrichtung fuer die Gitterkreise von Umformungseinrichtungen mit gittergesteuerten Dampf- oder Gasentladungsstrecken, insbesondere solchen, die mit hoher Spannung etrieben werden
FR743345D FR743345A (en(2012)) 1931-10-01
US566376A US1965416A (en) 1931-10-01 1931-10-01 Electric valve circuits
US566374A US1937369A (en) 1931-10-01 1931-10-01 Electric valve circuit
US581396A US1961057A (en) 1931-10-01 1931-12-16 Electric valve circuits
GB27217/32A GB400406A (en) 1931-10-01 1932-09-30 Improvements in and relating to electric valve circuits

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US566376A US1965416A (en) 1931-10-01 1931-10-01 Electric valve circuits
US566374A US1937369A (en) 1931-10-01 1931-10-01 Electric valve circuit
GB2721632A GB412909A (en) 1932-09-30 1932-09-30 Improvements in and relating to electric circuits

Publications (1)

Publication Number Publication Date
US1965416A true US1965416A (en) 1934-07-03

Family

ID=31891818

Family Applications (2)

Application Number Title Priority Date Filing Date
US566376A Expired - Lifetime US1965416A (en) 1931-10-01 1931-10-01 Electric valve circuits
US566374A Expired - Lifetime US1937369A (en) 1931-10-01 1931-10-01 Electric valve circuit

Family Applications After (1)

Application Number Title Priority Date Filing Date
US566374A Expired - Lifetime US1937369A (en) 1931-10-01 1931-10-01 Electric valve circuit

Country Status (4)

Country Link
US (2) US1965416A (en(2012))
DE (1) DE629683C (en(2012))
FR (1) FR743345A (en(2012))
GB (1) GB400406A (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486151A (en) * 1947-10-14 1949-10-25 Raytheon Air Beam Inc Electric motor control system
US2585573A (en) * 1948-10-29 1952-02-12 Bryant Grinder Corp Variable frequency power supply system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE756438C (de) * 1937-08-10 1953-12-14 Siemens Schuckertwerke A G Betriebsschaltung fuer gas- oder dampfgefuellte Hochspannungsgleichrichter
DE942578C (de) * 1938-01-30 1956-05-03 Siemens Ag Anordnung zur Herabsetzung der von einer Zuendeinrichtung fuer gas- oder dampfgefuellte Entladungsgefaesse zu liefernden Zuendleistung
US2529290A (en) * 1944-07-18 1950-11-07 Askania Regulator Co Electrical control circuit
US2502671A (en) * 1945-10-23 1950-04-04 Induction Heating Corp Electrical inverter system
US2517783A (en) * 1946-02-25 1950-08-08 Askania Regulator Co Control circuit for alternately operating electric devices
US2548887A (en) * 1949-10-27 1951-04-17 George C Izenour Filtered thyratron control circuits
US3156846A (en) * 1960-06-30 1964-11-10 Jr Hugo J Wilms High power thyratron inverter with a low value resistor by-pass

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2486151A (en) * 1947-10-14 1949-10-25 Raytheon Air Beam Inc Electric motor control system
US2585573A (en) * 1948-10-29 1952-02-12 Bryant Grinder Corp Variable frequency power supply system

Also Published As

Publication number Publication date
FR743345A (en(2012)) 1933-03-27
GB400406A (en) 1933-10-26
US1937369A (en) 1933-11-28
DE629683C (de)

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