SU1324085A2 - Device for switching parallel-connected thyristors - Google Patents

Abstract

The invention retracts to the field of electroexic and it can be used in automatic systems, where power is supplied from a constant voltage source. The invention is additional with respect to the basic but auth. St. JX 675552. The aim of the invention is to increase the resistance to immunity by means of the PSK, 1 of the number of false shutdowns of thyristors. The goal is achieved by the fact that 10. included in the stump of the charge of capacitors 8 and 9 in the wire, ipodrav, singing, ensures stable operation of the thyristors 1 and 3 and a sharp decrease in the supply voltage; (time of operation ycTpoiicTBa, discharge , tori 8, 9 when disconnected by a resistor 11. 1 or about 00 cf

Description

The invention relates to electrical engineering, can be used in automation systems, i Ac power is supplied from a constant voltage source, and is an improvement of the known device described in the ed. St. No. 675552.

The purpose of the invention is to improve noise immunity by eliminating false thyristor shutdowns.

The drawing is a schematic diagram of the device.

A device for switching parallel-connected thyristors contains sequential chains from thyristor 1 and diode 2, thyristor 3, diode 4, and switching on key 14 through the resistors 12 and 13 to the control electrodes the switching current of thyristors 1 and 3 is applied. Both thyristors are switched on as each the control electrode has a charge current of the capacitor and ensures that both thyristors are switched on regardless of their parameters, the load 5 is connected to the power source.

Diodes 2 and 4 provide a discharge of the capacitor charge circuit. In the absence of the indicated diodes, the first inclusive thyristor will shunt the remaining, charged capacitors, and the following will not turn on

20

the rest of them are parallel connected thyrisor to each other in series with loads of 15 tori. Capacitors 8 and 9 are also configured to be 5, one output of which, through the control of capacitive filters,

the chains are connected to a positive 6, and the other to the negative 7 supply buses of a constant voltage source. The capacitors 8 and 9 are connected by some plates to the cathodes of thyristors 1 and 3, respectively, and others to a source of constant voltage through diode 10, and between the common point of the cathodes of diodes 2 and 4 and the connection point of the plates of the capacitor and the anode of diode 10 is connected to a resistor 11. Resistors 12 25 connected thyristors but aut. St. Nos. 675552 and 13 are connected by one pin to a control one, characterized in that, in order to increase

For the thyristors 1 and 3, the electrodes are not resistant to one another by excluding the switching on of the diode 10 for any voltage fluctuations of the power source, the false switching off of the thyristors cannot occur. Resistor 11 provides capacitor discharge when disconnected.

Claims (1)

Invention device for switching in parallel other through key 14 to the positive power rail. The device works as follows. When applying voltage to busbars 6 and 7 with polarity indicated in the drawing, no current is supplied to load 5. At 30 the thyristors are turned off, the other capacitor plates are connected to a constant voltage source through an additional diode, and an additional resistor is connected between the connection point of the main diodes and the common point of the indicated capacitor plates. The key 14 is inserted through resistors 12 and 13 to the control electrodes, the thyristor turn-on current 1 and 3 are applied. Both thyristors are turned on because a capacitor charge current is applied to each control electrode and ensures that both thyristors turn on regardless of their parameters, the load 5 is connected to the source nutrition Diodes 2 and 4 provide for the discharge of capacitor charge circuits. In the absence of the indicated diodes, the first inclusive thyristor will shunt the remaining, charged capacitors, and the following will not turn on tori. Capacitors 8 and 9 also serve as capacitive filters, connected thyristors but auth. St. No. 675552 is characterized in that, in order to increase By turning on diode 10 for any fluctuations in power supply voltage, false thyristor switching off cannot occur. Resistor 11 provides capacitor discharge when disconnected. Invention device for switching in parallel noise immunity by eliminating false the thyristors are turned off, the other capacitor plates are connected to a constant voltage source through an additional diode, and an additional resistor is connected between the connection point of the main diodes and the common point of the indicated capacitor plates.