SU570224A1 - Switch for group of parallel connected gas discharged lamps with heated electrodes - Google Patents

Description

(54) DEVICE FOR PLUGING A GROUP OF PARALLEL-CONNECTED GAS-DISCHARGE LAMPS I WITH HEATING ELECTRODES i

The common diagonal of the diodes connected in parallel to the rectifying bridges is included in the common diagonal, the other diagonal of each of which is connected in parallel to the corresponding lamp in the heating circuit of its electrodes.

With a lamp for improving the reliability of lamp ignition, the anode and cathode of the thyristor are connected to the corresponding terminals of the power supply through high-resistance resistors.

FIG. 1 shows the device in a schematic diagram; in fig. 2 - graphics, for example, “SRI and currents on the elements of the device when the lamp electrodes are heated.

Consistently with each lamp 1, terminals 2, 3 and 4, 5 are connected divided into two parts ballast elements of an inductive-capacitive or inductive nature for operation from the mains frequency to capacitive-to networks from the low frequency.

In parallel with the lamps, a thyristor 6 is connected to the heating circuit of their electrodes, whose control electrode through diode 7, once “contacts 8 of time relay 9 and limiting resistor 1O, is connected to its anode,

The anode and cathode of the thyristor 6 are connected through high-resistance resistors 11 and 12 to terminals 13, 14 of the power supply, and through two wires 15 and 16 common to the whole group of lamps. Parallel to each other are connected to each gas discharge cable. lamp 1 rectifying bridges diodes 17-20, K | diagonal m of the alternating current which are connected to the electrodes of the lamps.

Curve 21 on. FIG. 2 shows the form of the power supply voltage, 22 is the rectified heating current of the electrodes of all the lamps, 23 is the current flowing through the resistors 11 and 12 and the thyristor 6, 24 is the total current of the thyristor 6.

The device works as follows. The power supply voltage is applied to terminals 13 and 14. At any polarity of the half-wave of the supply voltage to the control electrode of the thyristor 6 through the ballast elements connected to the terminals 2-5 diodes 17-2O of the rectifier bridges that are specific to each lamp, the wires 15 and 16 for the entire lamp group, diode 7, are closed pins 8 of the time relay 9 and the limiting resistor 1O are supplied by sig. cash management

The thyristor 6 is unlocked and the continuous heating of the electrodes of the whole group of lamps begins. Since the direct voltage drop across the diodes 17-2O of the rectifying bridges and the open thyristor 6 is small, the heating of the electrodes is carried out practically at the absence of voltage between the electrodes of the lamps

After sufficient heating of the electrodes, time relay 9 is triggered and by its contacts 8 it opens the thyristor control depot 6. When the current of the thyristor 6 passes through a zero value, the thyristor is locked and between the electrodes of the whole group of gas discharge lamps is applied to a voltage equal to the sum of the instantaneous voltage of the supply line and stress on the ballast elements.

The maximum instantaneous value of the voltage applied to each lamp reaches a double amplitude value of the network voltage. For this purpose, a small capacitor is connected in parallel with the inductive ballast.

The shots 17-20 of individual rectifying bridges for each lamp separate the gas-discharge lamps 1 at the time of their ignition and the normal burning of $ 1. The device can replace the electromagnetic time relay semiconductor.

Consider the conditions of locking the thyristor 6.

FIG. Figure 2 shows the voltage source shape (curve 21). In the mode of heating the electrodes of gas-discharge lamps 1, the current of the thyristor 6 consists of two components: the current of heating of the electrodes of all the lamps flowing through the ballast elements, the electrodes of the lamps 1, the diodes 17-2 O, individual for each lamp of the rectifier bridges and thyristor 8 (curve 22) and current flowing through high-resistance resistors 11 and 12 and thyristor 6 (curve 23).

The first component of the current of the thyristor 6 is the rectified heating current of the electrodes of all the lamps (curve 22) with a ke-ea spread of para-. meters of resistances of ballast elements and lamp electrodes and does not reach zero. The second component of the current of the thyristor 6 is the current, the flow through the secondary resistors 11 and 12 and the thyristor 6 (curve 23) is shifted relative to the first component by 9O. Due to this, the total current of the thyristor 6 (curve 24) has pauses

The use of high-resistance resistors 11 and 12 improves the conditions for locking the thyristor 6 and thereby increases the reliability of ignition of the lamps.

Thus, the device reduces the cost and simplifies the known scheme of the waiting group ignition of gas-discharge lamps, since the number of semiconductor NICK elements decreases, the number of wires common to the whole group of lamps and thereby increases its reliability.

Formula and 3 about b p i :. hen and

Claims (3)

1. A device for igniting a group of parallel-connected gas traps (bottom lamps with heating electrodes containing g divided into two parts ballast elements in the power supply circuit of each lamp, connected to the heating circuit of the electrodes of each VVPh parallel to it thyristor, between the control electrode and the anode of which ON1 .) Functions for opening the time relay contacts, characterized in that, in order to forgive the device and increase its reliability, the specified thyristor is included in the total diagonal of interconnected pa-15 devices to simultaneously straighten nyh bridges Dio RDH, other diagonal of each of them connected in parallel with the corresponding paw in the circuit of heating of its electrodes. 2. The device according to claim 1, which is so that, in order to improve the reliability of the ignition of the lamps, the cathode and the anode of the thyristor are connected to the corresponding terminals of the power supply through high-resistance resistors, Sources of information taken into account in the examination: 1. USSR author's certificate No. 498767, class, H 05 B 41/18, 1972. 2. Japanese Patent No. 48-19187, kp, 93D01, 1972. 3. Authors and the USSR No. 442583, cl. H 05 B 41/18, 1972.  G 5 And I. P i 0-1 Fig. / 2 / Fig2