Nova Patents
US2190010A

Luminescent tube system and apparatus

Abstract

This record has no abstract on file.

US2190010A, drawing sheet 1
Sheet 1 of 3

Term

Term ended

Expired 7 June 1957, 69.3 years ago.

  1. Priority and filed
  2. Granted
  3. Expired
  4. Today

4 claims: 4 independent, 0 dependent

  1. 1
    I claim:1. τη luminescent tube systems and apparatus of the character described, in combination, a plurality of luminescent tubes, having their one 05 ends connected together, an electrical transformer for energizing said tubes comprising a plurality of secondary windings corresponding in number to said plurality of luminescent tubes having their mid-portions grounded and having 70 their ends of corresponding polarities connected together, conductor means Interconnecting the common ends of said windings and the common ends of said luminescent tubes, and individual means interconnecting the other ends of said W ings are connected together by way of conductor 23 in an opposed phased relationship. Their induced electro-motive forces buck each other as diagrammatical# illustrated in Figure 2 of the 0 drawing. For the instant of time represented, the electro-motive forces, induced in windings 21 and 22, are toward each other as illustrated by the arrows placed adjacent the windings. A common current, therefore, does not flow in 10 these windings. In order that maximum output potential may be available at a permissible potential to ground, each of secondary windings 2 i and 22 is grounded at its mid-point. Convenient# the mid-points, 16 22 and 22α, of the windings are connected together by conductor 26 which in turn is connected to transformer casing I Ob as at 25, and transformer core 26 as at 26α. The transformer casing is connected to ground as general# indi20 cated at 27. _ ' Energization of tube 13 is had through transformer secondary winding 21 by way of conductors 28 and 29 and intervening high potential terminals 31 and 33 respective# Similar#, tube 25 14 is supplied with alternating current electrical energy at high potential by transformer secondary winding 22 using conductors 30 and 29 and intervening high potential terminals 33 and 32. The several terminals are secured In one or more walls of the transformer casing I Ob in any suitable manner. It is to be particularly noted that conductor 29 serves as a common supply conductor for both tubes. Also it is to be noted that terminal 32 is common to both secondary 35 windings. The conductor and the terminal must accommodate a current equal to twice that of conductors 23 and 30 and either of terminals 31 and 33. The near ends of secondary windings 21 and 40 22 are seen to be of like polarities. For an assumed instant, with electromotive forces established in secondary windings 21 and 22 from right to left as seen in the drawing and as illustrated by arrows, current from winding 2 ί flows 4 > through conductors 23,29 and 15 to tube i 3 and by way of conductor 28 back to the winding to complete the circuit. At the same time current from winding 22 flows through conductors 23, 29 and 15 to tube 14, and by way of conductor 20 back 50 to this winding to complete the circuit. Of course, where desired, see Figure 1, conductor 29 external# of the transformer may comprise individual parallel conductors 29α ana 29b connected respective# to tubes 13 and 16. 55 In such a case then, external conductors all are of the same current-carrying capacity. Internal conductor 29 and terminal 32, however, are of double this capacity, as above noted, since they carry the current of both secondary windings, co As a practical matter, however, since the magnitude of the current is but slight, all terminals and conductors are of like size and ratings, all being more than sufficient to handle the maximum current to be encountered. ( 5 It is to be particular# noted at this point that by virtue of common conductor 29, there are required only three high potential terminal members 21, 32 and 33, see Figure 1. This^ effects a saving of twenty-five per cent in this 70 costly item of expense. In addition, the use of three instead of a customary four terminal construction permits a more compact unit in which all of the high-tension terminal members are located on a common side of the transformer. This is particular# advantageous in assuring an 3,190,010 windings and the free ends of said luminescent tubes.
  2. 2
    2 in luminescent tube systems and apparatus or the character described, in combination, a 5 Plurality of luminescent tubes, having their nn» ends connected together, an encased electrical transformer for energizing said tubes comprising a plurality of secondary windings equal in number to said plurality of luminescent tubes having 0 their mid-portions grounded to the transformer ca ?~£. an d having their ends of corresponding' polarities connected together, conductor means, including a high potential terminal member bav“8 an insulating bushing positioned in a wall of j said transformer casing, interconnecting the common ends of said windings and the common ends of said luminescent tubes, and individual means, including a like number of high potential terminal members each having an insulating bush1 ing positioned within a wall of said casing, interconnecting the other ends of said windings and the free ends of said luminescent tubes. J um * nescen t tube systems and apparatus of the character described, in combination, a pair , of luminescent tubes, having their one ends connected together, an electrical transformer for energizing said tubes comprising a pair of secondary windings having their mid-portions grounded and having their ends of corresponding polarities connected together, single conductor means interconnecting the common ends of said windings and the common ends of said luminescent tubes, and individual means interconnecting the other ends of said windings and the free ends of said luminescent tubes.
  3. 3
    4. to transformer apparatus of the character described, in combination, an electrical trans- 8 former Including a plurality of secondary windings having their one ends connected together, a casing for said transformer, and a plurality of high potential terminals positioned within the walls of said casing and adapted to conduct high !· potential electrical energy from said transformer to an external load, one of said terminals being connected to the common interconnected ends of said secondary windings and the others of said terminals being connected to the free ends 18 of said secondary windings.
  4. 4
    5. in transformer apparatus of the character described, in combination, a transformer casing an electrical transformer positioned within said casing and including a pair of secondary windings 20 having their mid-points connected to said rasing and their one ends of like polarity connected together, and three high potential terminals mounted within the walls of said casing and adapted to conduct electrical energy from said 88 transformer to a pair of external loads, one of said terminals being connected to the common interconnected ends of said secondary windings and the other two of said terminals being connected to the free ends of said secondary wind- 20 mgs. CHARLES PHILIPPE BOUCHER.
Independent claims4