GB493374A - Improvements in and relating to electric circuits employing discharge devices - Google Patents
Improvements in and relating to electric circuits employing discharge devicesInfo
- Publication number
- GB493374A GB493374A GB980437A GB980437A GB493374A GB 493374 A GB493374 A GB 493374A GB 980437 A GB980437 A GB 980437A GB 980437 A GB980437 A GB 980437A GB 493374 A GB493374 A GB 493374A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- relay
- grid
- control
- valves
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/24—Electric supply or control circuits therefor
- B23K11/248—Electric supplies using discharge tubes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetically Actuated Valves (AREA)
- Arc Welding Control (AREA)
Abstract
493,374. Control systems for consumption apparatus ; valve relays. BRITISH THOMSON-HOUSTON CO., Ltd., KNIGHT, H. DE B., and HIGGINS, B. G. April 6, 1937, No. 9804. [Class 38 (iv)] [Also in Group XL] Current from an A.C. supply 1 to a load 2 is controlled by a pair of reversely con nected valves 10, 20 a relay 70 being pro vided so that when the valve 10 has conducted an overriding negative bias is applied to its grid and is not removed until the valve 20 conducts current. This prevents pulsating D.C. from being supplied in the event of the valve 20 breaking down. The relay 70 has two positions, engaging the contact 72 to connect the control circuit 14 to the grid 13, and engaging the contact 73 to connect the negative biassing potential from a battery 76 to the grid 13, operation of the relay being effected by current flow in the main circuit, the relay winding 74 being connected across an impedance 75 in series therein. Alternatively it may be supplied through a current transformer or connected in series with an inductance across the load circuit. Where the control of the valve 20 is dependent on the operation of the valve 10, one relay as shown is sufficient. Where however both valves are controlled from an external source a control relay is needed for each. In a modification, in which the valves 10, 20 are of the immersion igniter type controlled through auxiliary valves, the control relay 70 operates in the grid circuit of one of the auxiliary valves either directly on the control grid or on a screen grid. The Specification states that in welding operations this arrangement ensures that the valve conducting at the close of a welding operation will not conduct first at the commencement of the next operation.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB980437A GB493374A (en) | 1937-04-06 | 1937-04-06 | Improvements in and relating to electric circuits employing discharge devices |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB980437A GB493374A (en) | 1937-04-06 | 1937-04-06 | Improvements in and relating to electric circuits employing discharge devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB493374A true GB493374A (en) | 1938-10-06 |
Family
ID=9879091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB980437A Expired GB493374A (en) | 1937-04-06 | 1937-04-06 | Improvements in and relating to electric circuits employing discharge devices |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB493374A (en) |
-
1937
- 1937-04-06 GB GB980437A patent/GB493374A/en not_active Expired
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