SU253220A1 - CONTROL DEVICE FOR CONTROLLING SERIAL INCLUDED TYRISTORS - Google Patents

Description

Known devices for controlling sequential-connected thyristors containing separator capacitors and control transformers with two hieric windings require the use of auxiliary separating transformers, which complicates the thyristor control circuit.

The proposed device differs from the known ones in that half of the nervous windings of a transformer are connected in series with each other through part of the indicated capacitors, forming one symmetric branch, and the other half of the primary windings through another part of the capacitors, about the second symmetrical branch connecting the first one.

The drawing shows a diagram of a single control circuit cell.

The signal from the generator of the control (not shown) is transformed into the secondary winding / input transformer 2, and the control current flows sequentially (if the transverse parasitic capacitances are not taken into account) along both branches of the control circuit. The primary windings 3 H 4 of each control transformer 5 on} are very consistent with this signal, which is transmitted to the secondary winding 6 p through the shaping device 7, the control electrode of the corresponding thyristor enters.

In the pro duct case, when transmitting a short rectangular pulse with a circular front, the shaping device is a diode 8, which eliminates the reverse current of the control current. When controlling different-impulses, providing an impact on the electrical control of the drive-free springs during the required periods of time, the device will be selected in the form of a full-wave rectifier with the necessary corrective elements.

With the symmetry of the control circuit branches and the secondary windings of the input transformer) and 2 currents, the flow from the power circuit to them

will be equal, and since the inclusion of primary

windings of transformers 5 for ethnh currents

oncoming, they do not create magnetic fluxes in the cores of these transformers and in

The core of the input transformer. This eliminates the effect of power rating on the control circuits and on the generator of signals through the input} transformer 2. Intermittent jumps on the power circuit will be distributed along the scram of the primary windings of the control transformers 5. For a uniform H symmetrical The accumulation circuits all the inductances dissipate the rabbi between themselves, and the chains are distributed evenly between the links (the inductances of the dissipation of the secondary windings of the input transformer must be of the same order as and inductance dissipation of the primary windings of control transformers).

For ease of operation and maintenance, individual parts of the unit are combined in the form of identical modules containing several (10 or more) valves and the corresponding number of control units. Between the completed clamps of the control circuit of each module (except the last one), inductor 9 is connected, the midpoint of which is connected to the terminal of the power section of the module. The inclusion of its semi-windings 10 and // is such that the inductance of the coil is high for the transmitted signal of control | Venya and is close to zero for the voltage of the splice circuit. The use of such connections allows one to additionally fix the potential of the control circuit points of the module with respect to the potentials of the corresponding points of the power section of the block without impairing the passage of the pulse. When controlling a powerful semiconductor block consisting of multiple parallel and serially connected gates, all thyristors on the same potential that are parallel to one another can be controlled from a corresponding number of secondary windings of one control transformer, which allows a significant reduction in the number of circuit elements management

The simultaneous occurrence of a control pulse on all nents in the transmission of a signal along a longitudinal chain is ensured by the adoption of special structural measures — removing elements of different branches from each other to reduce transverse parasitic capacitances. First of all, it is necessary to reduce the parasitic capacitance between the primary windings of control transformers 5, which is easily accomplished by the proper arrangement of the windings. Control transformers can be executed as

one, and on two cores. The first option facilitates the fulfillment of the symmetry condition due to the absence of the need to select pairs of cores with the same static and dynamic magnetic characteristics. The advantage of the second variant is somewhat smaller transverse parasitic capacitances between the primary windings.

PRIOR DIRECTORSHIP and

20

A device for controlling sequentially connected thyristors, containing divider capacitors and transformers, is controlled with two primary overlays, included according to the control signal, and counter to the voltage of the power circuit, characterized in that, in order to eliminate the influence of the signal from the power circuit.

Half of the primary windings of the control transformer are connected in series between themselves through a part of these capacitors, forming one symmetrical circuit, and the other half of the primary windings are connected in series through the remaining capacitors, forming a second symmetrical circuit connected in parallel with the first.