US1857576A

US1857576A - Device for regulating alternating currents

Info

Publication number: US1857576A
Application number: US185059A
Authority: US
Inventors: Voorhoeve Nicolaas An Johannes
Original assignee: Philips Gloeilampenfabrieken NV
Current assignee: Koninklijke Philips NV
Priority date: 1926-05-20
Filing date: 1927-04-19
Publication date: 1932-05-10
Anticipated expiration: 1949-05-10

Description

May 10, 1932. N A. J. VOORHOEVE 1,357,575

DEVICE FOR REGULATING ALTERNATING CURRENTS Filed April 19, 1927 M or/1o ave Patented May It, 1932 PATENT OFFICE NIGOLAAS ANTHONY J'OHANNES VOORHOEVE, F EINDHOVEN, NETHERLANDS, AS- SIGNOR TO N. V. PHILIPS GLOEILAMPENFABRIEKEN, 0F EINDHOVEN, NETHER- LANDS, A LIMITED LIABILITY COMPANY OF THE NETHERLANDS DEVICE FOR REGULATING ALTERNATING- (TURIRENTS Application filed April 19, 1927, Serial No. 185,059, and in the Netherlands May 20, 1926.

This invention has reference to a device for regulating alternating voltages in which the regulation ensues as a result of load variations.

It has already been known from the French patent specification .No. 543,765 to regulate a varying working voltage by means of transformers and electron discharge devices in such manner that, if the working voltage dem creases, an auxiliary voltage has been added thereto and reverted.

Such a device has for its object to permit a constant working voltage to be taken ofi of a varying supply voltage. It also pro- I vides for the case in which the working voltage is influenced by load impulses.

In this case the filament heating temperature is regulated by the working voltage and the anode current flows in such manner through the transformer coil, that it excites in it a voltage which is opposed to the voltage prevailing in the second transformer coil, which is directly traversed by the supply current. Thus a reciprocal is insured by 5 reason of the fact that owing to an increase of the supply voltage the counteracting volt-- age. mcreases and ]11st keeps the voltage in the load current circuit constant.

According to the invention this is insured so by means of a device for regulating alternating voltages in which a variable auxiliary voltage is excited between the source of current and the load by one or more boostertransformers in such manner that the voltage at the load has a previously determinable characteristic, in that said auxiliary voltage nected. The load is connected to terminals 1 1 and 2. The numerals 5 and 8 designate interconnected transformers, the last named of which has two secondaries 6 and 7 which supply the filament heating current for

discharge tubes

3 and 4. 9 and 10 are resistances for controlling the filament heating currents.

The schematic circuit diagram shown in Fig. 2 corresponds approximately to that of Fig. 1 but shows a modification.

The regulating action according to the invention will now be explained by reference to Fig. 1. Assume the supply voltage E to be increasing. In the first instant the load voltage will also increase. This causes an increase in supply voltage of the filaments of the

tubes

3 and 4 as the filament heating transformer 8 is indirectly connected to the load voltage.

The impedance of the

discharge tubes

3 and 4 will therefore decrease and hence more current will be flowing through the winding 5".

If the auxiliary voltage which will be induced in the winding 5 by the winding 5",

is opposite to the supply voltage, the increase of the supply voltage will be opposed. It can be so regulated that it neutralizes the increase in supply voltage so that the load voltage remains about constant. The same will occur when the load current I increases. case the auxiliary voltage m the wind- In this ing 5 will nearly balance out the auxiliary potential drop in this winding.

The action of the circuit arrangement of Figure 2 in which like numerals refer to the the anode current thereof increases.

nected that as a result the working voltage also decreases so that the latter remains substantially constant.

Now assuming that the load current is increasing, in that case the working voltage will decrease. The impedance of the discharge tubes increases as a result of the decrease of the filament heating current. The anode current of the tubes decreases and the current through the primary 5 of the transformer 5 increases. The voltage on the coil 5 consequently rises and as stated above, the latter is so connected that the working voltage increases again. This increase is so regulated that it compensates the decrease of working voltage due to the increase of the load current.

Itis to be noted that in this last case (Fig.

' 1) an increase in the load voltage will give an increase in current flowing through winding 5". In the arrangement shown in Fig.2 an increase in load voltage will cause a decrease of this current. Accordingly the connection of the winding 5 in Fig. 2 must be exactly the reverse as in Figure 2, so that the voltage induced in the winding 5' will be in the right direction.

It is obvious that the invention is susceptible to numerous modifications and adapta tions without departing from the spirit thereof, and it is intended that the invention be limited only by the scope of the appended claims.

What I claim is:

' 1. A device for regulating alternating voltages, comprising main leads, a load connected across said leads, two oppositely connected discharge tubes, the said tubes being connected in parallel, a transformer, the secondary winding of said transformer being inserted in one of the leads to the load, and theprimary winding thereof being included in a circuit which also comprises the said parallel connected tubes, said circuit being connected across the said main leads, and a second transformer, having its primary winding connected between said leads, the said transformer having two secondary windings each connected to the filament of a corresponding one of the said discharge tubes.

2. A device for regulating alternating voltages, comprising main leads, a load connected across said leads two oppositely connected discharge tubes, the said tubes being connected in parallel, a,transformer, the secondary winding of said transformer being inserted in one of the leads to the load and the primary winding thereof being connected in series with the said tubes, the said series combination being connected across the said main leads, and a second transformer having its primary winding connected between the said leads, the said transformer having two secondary windings each connected to the filament of a corresponding one of the said discharge tubes.

3. A device for regulating alternating voltages, comprising main leads, a load connected across said leads, two oppositely connected discharge tubes, the said tubes being connected in parallel, a transformer, the secondary winding of the said transformer being inserted in one of the leads to the load, and the pri- J