US1592529A - Rectifying arrangement for alternating currents - Google Patents

Description

Jul 13 1926.

M. LATOUR RECTIFYING ARRANGEMENT. FOR ALTERNATING CURRENTS.

Filed July 15. 1920 INVENTOR fllarz'l/s Lazour' BY M $0M, ATTORNEYS Patented July- 13, 1926.

UNITED STATES PATENT OFFICE.

mamas LATOUR, or runs, FRANCE, ASSIGNOR TO nn'ronn CORPORATION, or JERSEY CITY, rmw JERSEY, A CORPORATION or DELAWARE.

RECTIFYING ARRANGEMENT FOR ALTERNATING CURRENTS.

Application filed July 15, 1920, Serial No, 396,500, and in France August 14, 1917.

(GRANTED 1mm THE rnovismns or THE ACT or minor: 3, 1921, 41 sum. I.., 1313.

My invention relates to rectifying systems and more particularly to rectifymg systems employing thermionic valves.

One of the principal objects of my nvention is the provision of a rectifying system possessing the following advantages:

1. Heating of the filamentary cathodes of the valves in said system by alternating current and,

2. Protection of the valves in said against excessive current.

Other objects and advantages of my in system 'vention will be apparent from the following 2 description taken in connection with the accompanying drawings in which Fig. 1 is a schematic diagram of a preferred embodiment of my rectifying system and Fig. 2 is a schematic diagram of a' modification of my invention.

Referring to Fig. 1, 1 and 2 are two-elemenb thermionic valves each comprising an anode 3 and a filamentary cathode 4. The anode of valve 1 is connected to the filamentary cathode of valve 2 and the anode of valve 2 is connected to the filamentary cathode of valve 1 through two condensers 5 and 6 connected in series as shown.

The primary winding 20 of transformer 7 is connected across a source of alternating current power 8. One extremity of the secondary-winding 21 of transformer 7 is con- I nected to the anode of valve 1 and the filamentary cathode of valve 2 as shown; while the other extremity of the secondary winding 21 is connected between the two condensers 5 and 6.

The filamentary cathodes '4 of the two valves are energized by means of transformer 9 having two outside legs and one middle leg as shown. The primary winding 22 of'tra'nsformer 9 is mounted on the middle leg and connected across the source of alternating current power 8. The secondary windings 23 and 24 are mounted on the two outside legs, those windings being so arranged that their ampere turns normally balance resulting in substantially zero magnetic interaction between them. The filamentary cathode of valve 1 is connected across secondary winding 23 and the filamentary cathode of valve 2 is connected across the other secondary winding 24. Rectified current is supplied by the leads 10 and 11 as shown.

Referring to Fig. 2, each filamentary cathode 4 is connected across a source of alternating current power 8 through a coil 12. These coils are mounted on a magnetic core 13 and are so arranged on'the core that their ampere turns-normally balance resulting in substantially zero magnetic interaction between them.

The system disclosed in Fig. 1 functions in. the fOllOWlIlg manner: The valve 1 rectifies one half of the alternating current wave while the valve 2 rectifies the other half of the wave, the condensers 5 and 6 serving to iron out the rectified current pulsations and also preventing short-circuits between the anodes and filamentary cathodes of the various valves.

The filamentary cathodes 4 are energized the two secondary windings resulting in a very substantial increase in the imped ance of the secondary winding connected to the undamaged filamentary cathode. This results in the substantial diminution of the current, in the undamaged filamentary cathode thereby cutting down the load on the undamaged valve and preventing its burnmg out.

.The modified system disclosed in Fig. 2 functions as follows: The coils 12 normally balance'each other magnetically.- Their "individual impedances are therefore very small. If one of the filamentary cathodes burns out, one of the coils is substantially open-circuited resulting in a substantial increase in the impedance of the other coil. This increase in impedance substantially diminishes the current flowing in the undamaged filamentary cathode and prevents its burning out.

While I have shown and described various preferred embodiments of my invention, I

do not limit myself to the same; but may employ such other modifications as come within the spirit and scope of my invention.

Claims: i 1

1. In a system for rectifying alternating current, a source of alternating current of a certain voltage, a plurality of electron discharge devices each provided with a cathode and an anode, a physically separate wholly metallic circuit in series with each cathode, a separate transformer winding in series with each circuit, each transformer winding being inductively connected to said source for supplying alternating heating current to its circuit derived from said source, means for applying alternately to said an odes positive potentials developed from said source whereby space currents flow alternately between the cathodes and the anodes of the respective devices, a plurality of capacities and connections for causing said space currents to charge said capacities one at a time and for causing said capacities to discharge in series, whereby unidirectional current of a higher voltage than said source is developed.

2. In a current rectifying arrangement, of pair of electron discharge rectifiers, each provided with a filament and an anode, two physically separate transformer windings, one of said, windings being connected in series with one of said filaments and the other of said windings being connected in series with the other of said filaments, and an additional transformer winding, the anode of a first one of said rectifiers and the filament of a second one of said rectifiers being connected to one terminal of said additional winding, the filament of said first rectifier being connected to the other terminal of said additional winding through a capacity and the anode of said other rectifier being connected to said last-mentioned terminal of said third winding through a second capacity.

3. In a current rectifying arrangement, a source of alternating current to be rectified, a pair of electron discharge rectifiers, each provided with a filament and an anode, two physically separate transformer windings, one of said windings being connected in series with one of said filaments and the other of said windings being connected in series with the other of said filaments, an additional transformer winding, and means for connecting said transformer windings inductively to said source of alternating current, the anode of a first one of said rectifiers and the filament of a second one of said rectifiers being connected to one terminal of said additional winding, the filament of said first rectifier being connected to the'other terminal of said additional winding through a capacity and the anode of said other rectifier being connected to said last-mentioned terminal of said additional winding through a second capacity.

4. In a current rectifying arran ement, a pair of electron discharge rectiii ers each provided with a filament and an anode, two physically separate transformer windings normally magnetically balanced with respect to each. other, one of said windings being connected in series with one of said filaments, and the other winding being connected in series with the other of said filaments, and an additional transformer winding, the anode of a first one of said rectifiers and the filament of a second one of said rectifiers being connected to one terminal of said additional winding, the filament of said first mentioned rectifier being connected to the other terminal of said additional winding through a capacity, and the anode of said other rectifier being connected to said last mentioned terminal of said additional winding through a second capacity.

In witness whereof, I have hereunto signed my name.

I MARIUS LATOUR.

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