SU525207A1 - Thyristor DC Pulse Converter - Google Patents

Description

(54) THYRISTOR PULSE CONSTANT PULSE CONVERTER I warm connected diode, total co. the second are connected to the common commutation point of the hand of the capacitor and the working windings of the I controlled throttle,; FIG. 1 is a schematic diagram of the proposed device; in fig. 2.3 - diagrams of currents and voltages. ; The device contains a bridge reverser on four thyristors i-4, a bridge of reversible diodes §-8, pulse transformers; The primary 9,10 and i secondary 11,12 windings, respectively, switch a device consisting of auxiliary thyristors 13,14, auxiliary, diodes 15,16, and commuting condensation a mountain 17, and a controlled choke with control windings 18, 19 and the working windings 20, 21. To the input terminals 22, 23 of the source with a midpoint 24 are connected in series primary windings 9, Yu pulsed transformers, a bridge reverser on thyristors 1-4, the diagonal of which is connected to a circuit from the control windings 18, 19 controlled throttle And loads 25, for example, the windings of the electric motor core. An inverse diode bridge 5–8 is connected to the input terminals 22, 23, the alternating current bridge of which is connected to the corresponding terminals of the mosquito reverser on thyristors. The secondary windings 11, 12 of the pulse transformers, the auxiliary thyristors 13, 14 are connected in series and connected to the input terminals 22, 23, to which are also connected diodes 15, 16 in series. Between common points of auxiliary thyristors 13, 14 and diodes 15, 16 is a switching commutator 17. Successively connected working windings 20, 21 of the controlled chokes are connected between the midpoint 24 of the supply voltage and the common side of the auxiliary diodes 115, 16.

The proposed device works as follows.

The impulse of the bridge and the thyristors of the bridge correspond to the auxiliary, the thyristors arrive alternately., Pr oyirplpi, for example, ancillary tristor 13 co-sponsor 17 charge: ats along the circuit: 22-11-13-17-20-21-24,

In the case of the armored arm of the T Tristor 1-1, the charge of the co-sponsor 17 will be 21-20, 21-17-14-12-23. , By.: Hp of the first cycle of charge of a commutator coil 17) the amplitude of the voltage on its plates reaches the maximum

There is a capacitor charge from the power source, which compensates for the losses in the circuits.

When switching the working thyristors 1-4, the power from the nagruaki 25 circuit is stored in the switching circuits, which is stored in the impulse transformers, which leads to

j increase in the amplitude of the voltage on the capacitor 17. On the other hand, the load current 25 flowing through the control windings 18.19 of the controlled choke reduces the inductance of the working windings 20 and 21.

This leads to a more rapid increase in the current in the working windings of the throttles 20, 21 and, accordingly, to an increase in the time during which the switching circuit is connected to the power source. Wherein

the amount of energy entering the oscillatory circuits from the source increases substantially, thus ensuring the accelerated growth of the switching capacity of the device. This is reduced by one

Claims (1)

I hand, the duration of the transient, close to twice the source voltage. When the voltage I of the capacitor 17 reaches its maximum value, the current in the switching circuit changes sign, so that the auxiliary thyristor 14 is turned off and the voltage on the capacitor does not change until the next tact of the device. The circuit of the recharge of the switching capacitor 17 at all subsequent switch-offs is It is derived from the one that existed during the i first step of the capacitor charge. Now the process of recharging capacitor 17 consists of two intervals: 1) elements of 17,15,10,13 (or 17, 14, 12, 16, respectively) form a re-arming circuit; 2) the chains of perezapar and form the elements 17, 20, 21,24, 22,10,13 (or, respectively, 17,14,12, 23,24,20,21). In the first interval, the current through auxiliary 1st diode 15 (or diode 16) flows in the forward direction, while the working windings 20,21 controlled throttles turn out to be connected to one of the input terminals of the power supply. The current in the working windings 20,21 controlled throttle increases almost linearly. Since the increasing current through the auxiliary diode is directed towards the current of the oscillating circuit, which has the shape of a half-sine, a moment comes when these currents are equal and the diode is shifted in the opposite direction, from this moment the second capacitor recharge interval begins. .... wherein the recharge circuit includes a power source51. On the second interval in the switching circuit, when the load current has a pronounced remote component, and on the other hand, it creates the possibility of reducing the initial switching capacity and thus increasing the energy performance of the amplifier (FIG. 2.3). Invention formula Thyristor pulse converter voltage containing connected to a power source with a midpoint through the primary windings of pulse transformers a thyristor bridge, in the diagonal of which the load is connected And control Auxiliary winding of the throttles, a bridge of reverse diodes, as well as a switching device consisting of series-connected secondary windings of pulse transformers and two-auxiliary thyristors, to the common point of which a switching capacitor terminal is connected, characterized in that, in order to increase switching capacity with increasing load It is additionally equipped with two series-connected diodes connected to the input terminals, the common point of which is connected to another terminal of the specified The con- trol capacitor and the connection point are opposite, parallel-connected working windings of the control throttle, and their other connection point is connected to the midpoint of the power source. 25 17 BUT Fi. 2 Fi.Z