US1907279A - Electrical timing arrangement - Google Patents

Description

May 2, 1933. K. H, BLOMBERG ELECTRICAL TIMING ARRANGEMENT Filed April 10, 1930 K #B/am berg jm eNTaQ Patented May 2, 1933 UNITED STATES" PATENT: OFFICE KNUT BLOHBERG, ,OI'. APPELVIKEN, SWEDEN, ASSIGNOR TO TELEFONAKTIE- BOLAGET L. I. ERICSSON, OI STOGKHOLH, SWEDEN, A COMPANY OF SWEDEN ELECTRICAL TIMING ARRANGEMENT.

Application fled April 10, 1980, Serial No. 448,188, and in Sweden April 15, 1929.

The present invention relates to electrical timing devices such as time relays,- time switches etc. More especially, the invention relatesto such devices in which the timing member is constituted by a condenser in combination with a high charging resistance and a discharge device having a fixed lighting voltage, by wa of example a glow lamp or a. glow tube. gaid elements may, by way of 0 example, be mutually so connected that, upon operation, the condenser is charged over the resistance so that after a predetermined period the condenser voltage has attained the lighting voltage of the discharge device.

The condenser then discharges over the discharge device whereby a current impulse is obtained that may actuate the device to be time controlled.

Such timing arrangements afl'ord great advantages by their lack of movable parts, their recision. and their adaptability to be adusted for diflerent lengths of time, fromfractions of a second up to several hours, but their application has hitherto been restricted to such cases when the available operating voltage has exceeded the lighting voltage of the discharge device. Existing types of glow lamps and glow tubes generally preferred and used for said purpose arenot at resent manufactured for lower voltages than 0 to 80 volts and, on account of the nature of the glow I dischar e phenomenon, a further reduction in the ligfiting voltage appears impracticable. It has thus not been possible to make use of said timing arrangements at the voltages usually occurring 1n the communication art, i. e. 24 to volts.

According to the/present invention 'it has been rendered possible toope'r'ate such timing arrangements at a lower voltage than the lighting volta e of the discharge device.

According to e invention, this is brought about by that, during the charging of the condenser over the charging resistance, one or to the operating voltage are series connected to the former condenser so that the condenser voltages during'the charging-are added together whereby the; lightingavoltage of the discharge, device may be attalned by means of a lower operating voltage. I

The invention will now be more closely de scribed with reference to the accompanying drawing in which Figureldiscloses a circuit diagram of an embodiment of the invent1o n, and Fig. 2 shows another embodiment 1n a similar manner. On the drawing,

Figure -1 is a circuit diagram for a time relay in, which the operating voltage is less than the lighting voltageof the glow lamp but higher than one halfthereof. G denotes the glow lamp or glow tube, C1 and C are two.

condensers of suitable capacity, by way of tive position, the normally closed contacts 1 and 2 remain closed. Over said contacts; the

condenser C is connected to the current source E, i.e. it is standing by, charged to said potential, which is lower than the lighting voltage of the lam G. Over the contact 2 the condenser O is s ort-circuited over the resistance 1- When the relay R isenergized, upon the starting of the timing arrangement, the normally closed contacts 1 and 2. are opened by the relay armature and. the normally open contacts 3 closed. The short-circuit of thecondenser G is thus removed and more other condensers previously charged 0 is instead connected to the current source E over thehigh charging resistance r and the charging of the condenser starts. The condenserC is disconnected at the same time from the current source but its voltage ,decreases very slowly on account of the high insulating resistance of the condenser. The

' two condensers are, as shown, interconnected in such a manner that the voltage of the condenser C continuously increasing during 'the charging, is added to the voltage of 0 When the voltage of C after the fixed period has attained such a value that the resulting voltage is equal to the lighting voltage of the glow lamp the lamp is lighted and the condensers discharge through the lamp and the series-connected relay R until the resulting voltage has fallen below the extinction voltage, of the lam when the glow disrelay R is energized.

charge ceases. By the charge im ulse the relay R is energlzed and holds itse f,in circuit over the contact 4 and makes or breaks,

as the case may be, the circuit to be actuated .afterthe fixed period, by way of example an alarm circuit over the contact 5 or 6 respectively. v I

The relay R is ener ed so long as the When the relay R is de-energized the holding-circuit of B is in-- terrupted so that said relay also becomes Ideenergized. At the same time, C is short-' circuited over 1', over the contact 2- and connects C to the current source over the contacts 1 and 2. The circuit arrangement is thus restored to the starting condition.

If the energization of the relay R is of shorter duratlon than the fixed period,- R will, before the discharge has taken place and the relay R, has been energized, short-circuit C and charge C to full voltage in above mentioned manner at its normally closed contacts 1 and 2. As soon as R has thus been de-energized the timing arrangement is restored to the starting position and afterthe re-energization of R the fixed period must again lapse before R operates. I

' Figure 2 shows a corresponding circuit arrangeme'nt for the case that the voltage E is less than about one half but higher than one third of the lightin voltage of thelam G.

Three condensers C, and C, vare ere series-connected during the charging whereas two of them, i.e. C and C are previously each charged to the voltage E.

When R is in inoperative position 05 and G, are, over the normall closed contacts 7, 8, 9 and 10, connected in parallel to the current source E and thus charged to the correspondingvoltage. The condenser C1" is short-circuited over 1', over the contact 10. When R is energized said shortcircuit is interrupted and 0 is, over the contact 11, connected to the current source E over the charging resistance 1' for which reason the voltage thereof is gradually increased. Simultaneously C, and C. are disconnected from the current source and series connected over the contacts 12 and 13. The

three condensers are new series connected voltage with one another and the resulting Wh is impressed upon the glow lamp the corresponding lighting voltage is attained discharge current 15 passing through the relayR so that said relay is energized in above mentioned manner. The re-chargingof the condensers C and C and the short-circuiting of C, upon the de-energization of the relay R is completely analogous to the manner of operationdescribed in connection with Figure 1.

It is readily understood that it is possible to combine so many part voltages that the lighting voltage of the lamp may be attained also in case of very low operating voltages.

In order to reduce the-number of condensstrong discharge impulses, it has been found rangement may then be carried out in sucha manner that the condensers C and O in inoperative position, do not stand by in continuouslyfcharged condition but, upon' the relay R operatin for a short moment, by way of example t rough an auxiliary relay,

are connected to the currentsource before the charging of C1 begins. v

It is readily understood that the characteristic features of the present invention arenot restricted only to the embodiments shown in Figures land 2. The invention is evidently completely independent of the function to be performed bythe timin arrangement and it may thus be applie in many different kinds of time rela s, time switches or the like connected in di erent manners.

' Also in such cases when the operating voltage is comparatively high, for instance 100 volts, and per se suflicient to light commercial discharge devices having a. low lighting voltage, it may be preferred to use a discharge device of a higher lighting volta than the available operating voltage for tfi: reason that the discharge impulses will be stronger, the greater is the difference between the lighting and theextinction voltages and saiddlfl'erence increases with the voltage rating of the discharge device. Then, of course, the resent inventlon may be advantageously app ied to attain the required lighting volt- I claim:

An "electrical timing arrangement com- 'ers required while maintaining sufliciently I prising a timing condenser and a plurality of auxiliary condensers, connected in series with one another and with a discharge device, a charging current source having a 5 lower voltage than the lighting voltage of the discharge device, a timing resistance, and

a switch adapted, in normal position, to connect the current source in parallel with the auxiliary condensers while separating the timing condenser from the current source and, in timing position, to connect the current source to the timing condenser throu h the timing resistance while separating t e auxiliary condensers from the current source.

2. An electrical timing arrangement as claimed in claim 1 in which the tlmin condenser has a capacity difiering from t at of the auxiliary condensers.

3. An electrical timin arrangement as claimed in claim 1 in w ich the switch is adapted, in normal position, to short-circuit the timing condenser.

a 4. An electrical timing arrangement comprising a timing condenser and an auxiliary 'condenser, connected in series with one another and with a discharge device, a charging current source having a lower voltage than the lighting voltage of the discharge w device, a timing resistance, and a switch adapted, in normal position, to connect the current source in parallel with the auxiliary condenser while separating the timing condenser from. the current source and, in timing position, to connect the current source to the timing condenser through the timing resistance while separating the auxiliary condenser from the current source.

5. An electrical timin arrangement as claimed'in claim 4 in WhlCh the timin con denser has a capacity difi'ering from t at of the auxiliary, condenser.

6. An electrical timin arrangement as claimed in claim 4 in wfiich the switch is adapted, in normal position, to short circuit the timing condenser.

In testimony whereof I aflix m si ature.

KNUT HUGO BLOKIB RG.

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