SU1617559A1 - Device for controlling power thyristors - Google Patents

Abstract

The invention relates to a pulse technique and is intended for use in thyristor control systems for static converters. The aim of the invention is to improve the noise immunity of the device. This goal is achieved by the introduction of current transformers 3.1-3.I, the primary windings of which are included in the power circuits of the power thyristors 4.1-4.I, and the secondary windings are intended for charging storage capacitors 8.1-8N of control pulse drivers. 2 Il.

Description

ABOUT

 ate yu

The invention relates to a pulse technique and is intended for use in control systems for power thyristors of various energy converters, in particular, many cell thyristor resonant inverters.

The purpose of the invention is to improve noise immunity.

Fig. 1 is a schematic diagram of the device; Fig. 2 shows voltage diagrams for various elements of the device.

The device for controlling the power thyristors (Fig. 1) contains n driver control formers consisting of n accumulative blocks 1.1-1.P (n is the number of inverter power thyristors) and n delay elements 2.1-2.P n transformers 3.1 -3.p of the current included in the power thyristor circuit 4.1-4.p, distributor F: control pulses and resistor 6. Distributor input b is intended for connection to the output of the master oscillator. Each storage unit contains a 7.1-7 .P diode in the power supply circuit. Cumulative P capacitance 8.1-8.P and tyriptora 9.1-9.P soshvotstvenno.

Figure 2 shows the diagrams of the arrival of pulses at the input of the distributor 5 (Ufi), as well as the diagrams of the passage of current to D through thyristors 4.1,4.2 and 4.p (respectively 1.1.1. 11.2 and l.in) and voltages at cumulative capacitances are 8.1, 8.2 and 8.n (U8. ь Us and Us.n respectively at).

The device works as follows.

When the supply voltage is applied (time ti in figure 2), the storage capacity

The 8.1 accumulator unit 1.1 is charged through the resistor 6 with the anode voltage of tmistor 4.1. Next, the given generator is switched on (moment t2 in FIG. 2). Its output pulses through the distributor 5 are simultaneously fed to the control inputs of all the control pulse drivers. However, only shaper 1.1 is triggered, since only its storage capacity of 8.1 is charged. After some time, determined by the parameters of the delay element 2.1, the control pulse from the output of the storage unit 1.1 through the delay element goes to the thyristor 4.1 and turns it on. In this case, the storage capacity 8.1 is discharged. A current flows in the thyristor circuit 4.1, which through the transformer 3.1 and diode 7.2 charges the storage capacitor 8.2 of the driver

1.2 control pulses

The next impulse of the master oscillator triggers the thyristor

4.2, and the further operation of the device is similar.

Current and voltage charts on various elements of the device for cases

 shown in Fig. 2, where the indices show the element number in Fig. 1, to which the current or voltage refers, and t s is the delay time.

The constant time of the charging circuit of the storage capacitor 8.1 through the resistor 6 is several orders of magnitude longer than the thyristor activation period 4.1, and, therefore, this circuit does not affect further operation,

In the event of electromagnetic interference, false alarms can occur only in that thyristor, the storage capacity of the driver is controlled, and their pulses are

At the time of impact, the interference is charged, t, e, at the thyristor, KOTOfHiiH according to the operation algorithm and should work.

Thus, the use in the control system of the proposed device

For control, power thyristors will improve the noise immunity of the control system.

Claims (1)

Invention Formula Power Control Device thyristors, containing a master oscillator and control pulse shapers according to the number of thyristors, each of which contains a storage capacitor, the first, whose output is intended for under / 1 and more to the cathode of the corresponding power thyristor, the key element, the first output of which is connected the second output of the sensor, and A diode connected in series with a capacitor, characterized in that, in order to improve noise immunity, a transformer with secondary windings according to the number of power thyristors is introduced, current transformers and delay elements for the number of power thyristors and a resistor, the first terminal of which is intended to be connected to the anode of one i-. power thyristors, and the second is connected to the second output of the capacitor of the corresponding control pulse driver, the outputs of the delay elements are intended for connecting to the control transitions of the corresponding power thyristors, and the inputs to the first capacitor output and the EiiopOMy output of the key element of the corresponding control pulse drivers, the control inputs of the key elements which are connected to the corresponding secondary windings of the transformer, the primary winding of which is connected to the output of the master oscillator, in parallel control pulse drives, the secondary winding corresponds to the trans) of the current armature, the primary of which is intended to include the capacitor and the diode of each of the form-5 subsequent power thyristor. FIG. 2 control pulse drives, the secondary winding of the corresponding trans current transformer, the primary winding of which is intended to turn on subsequent power thyristor.