SU1483681A1 - Device for automatic enabling of back-up radiator - Google Patents

Abstract

The invention relates to electrical engineering. The purpose of the invention is to increase reliability. The device contains terminals for connecting the main and backup light emitters 1, 2 and 3, connected between power buses 4 and 5 via thyristors 6, 7 and 8, respectively. The control electrode of the thyristor 6 is connected to the positive power line through a resistor 9 and a capacitor 10, shunted by a resistor 11. The control electrodes of the thyristors 7 and 8 are connected to the midpoint of the RC circuit of resistors and capacitors 12, 13, 14 and 15 through transistors 16 and 17 respectively. The transistor bases are connected to the thyristor anodes 6 and 7 through resistors 18 and 19, and resistors 20 and 21 are connected to the positive power line 4. When voltage is applied to the power lines, the main light emitter is turned on, when the main emitter malfunctions, The radiator turns on the next backup learner. 1 h. P. f - ly, 1 il.

Description

one

(21) 4269189 / 24-07

(22) 26.06.87

(46) 05/30/89. Bul № 20 (72) Yu.N. Khudorozhkov

(53) 621.316.57 (088.8)

(56) USSR Copyright Certificate No. 493939, cl. H 05 B 39/10, 1974.

USSR author's certificate number 650250, people. H 05 B 39/10, 1979.

(54) DEVICE FOR AUTOMATIC INCLUSION OF BACKUP RADIATOR

(57) The invention relates to electrical engineering. The purpose of the invention is to increase reliability. The device contains terminals for connecting the main and backup light emitters 1, 2 and

3, connected between the power buses 4 and 5 via the thyristors 6, 7 and 8, respectively. Control electrode

thyristor 6 is connected to the positive power line through a resistor 9 and capacitor 10, shunted by resistor 11. The control electrodes of thyristors 7 and 8 are connected to the midpoint of the RC circuit of resistors and capacitors 12, 13, 14 and 15 via transistors 16 and 17, respectively. The transistor bases are connected to the thyristor anodes 6 and 7 through resistors 18 and 19, and resistors 20 and 21 are connected to the positive power line 4. When voltage is applied to the power lines, the main light emitter is turned on, when the main emitter malfunctions, the radiator turns on the next backup radiator. 1 hp ff, 1 ill.

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This invention relates to electrical engineering and can be used in devices with redundant light or heat sources.

The purpose of the invention is to increase reliability.

The drawing shows a diagram of the proposed device.

Emitters 1, 2 and 3 are connected between power lines 4 and 5 via thyristors 6, 7 and 8, respectively. The control electrode of the thyristor 6 is connected to the positive power line through a resistor 9 and a capacitor 10, shunted by a resistor 11. The control electrodes of the thyristors 7 and 8 are connected to the midpoint of the RC circuit from resistors and capacitors 12 and 13, 14 and 15 through transistors 16 and 17 respectively. The transistor bases are connected to the anodes | of thyristors 6 and 7 through resistors 18 and 19, and the light emitters 1 and 2 are shunted by resistors 20 and 21, respectively. The dotted line shows the installation of threshold elements, such as dinistors, can be installed zener diodes or other threshold elements.

The device operates as follows.

When voltage is applied to the power lines 4 and 5 indicated in the drawing, the thyristor 6 is turned on, since current is supplied to its control circuit through a capacitor 10 and a resistor 9. The light emitter 1 is connected to the power buses. The transistor 16 is closed and the transistor 17 is open, because the base of the first is connected to the negative power bus through a resistor 18 and the thyristor 6, and the base of the second is connected to the positive power bus through resistors 19 and 21. The thyristors 7 and 8 are not included, since the control electrode of the first one does not receive anything at all, and the control electrode of the second receives current through a resistor 14, which does not enable the switching of the thyristor. Capacitor 13 is charged through resistor 12 to supply voltage. When the emitter 1 is burned out, the thyristor is closed, since the resistor 20 is selected so that it does not provide the holding current of the thyristor in the on state, while the transistor 16 opens and the capacitor 13 is discharged through

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thyristor control circuit 7, which, including, switches the emitter 2 between the power buses. When this happens, the transistor 17 is closed and the capacitor 15 is charged before the supply voltage. When radiator 2 burns out, transistor 17 opens, after thyristor 7 goes out, and thyristor 8 is turned on by the discharge current of capacitor 15. When threshold elements are included in the basic circuits of transistors, the circuit's reliability increases if the radiator 2 is out of service or its contact with the power bus is broken then when the thyristor 7 is turned on, the transistor 17 closes, and opens only when the thyristor 7 closes and the voltage on its anode increases more than the breakdown voltage of the threshold element. During this time, the capacitor 15 must be charged to a level that enables the thyristor 8 to turn on.

Claims (2)

Invention Formula 1, A device for automatically switching on a backup radiator, containing a positive and negative power bus, an RC circuit by number backup emitters, the main circuit of series-connected resistors, a capacitor, one of the terminals of which is connected to the combined terminals of the main circuit resistors of series-connected resistors, one of which terminals is connected to a positive power bus that is connected to the terminals for connecting the main and backup emitters, others terminals for connecting the main and backup emitters are connected to the anodes of the corresponding thyristors by the number of emitters whose cathodes are connected to the negative A power bus, characterized in that, in order to increase reliability, bipolar transistors and additional circuits of series-connected resistors are introduced according to the number of back-up radiators, the other capacitor lead is connected to the positive power bus, another main circuit lead from the series-connected resistors is connected to the control electrode of the thyristor of the main radiator, RC circuits are connected in parallel 514836816 the thyristors of the backup emitters, the house is connected to the bases of the corresponding resistor - to the anode of the thyristor, common bipolar transistors, by the dilution condenser - to the cathode of the thyristor, the output terminal of the resistors are the additional control electrodes of the thyristors of the real circuits connected in series The transmitter emitters are connected to emit resistors connected to the anode by the preceding bipolar thyristor. transistors whose collectors are under- 2. The device according to claim 1, of tl l and are connected to the joint pins, recurrent in that they are entered torus and capacitor corresponding 10th threshold elements through which to RC circuits, additional circuits from the other pins of additional circuits Consequently, resistors connected in series with a single output terminal are connected to the positators; the bases of the corresponding to the power supply bus, and to other output bipolar transistors.