SU944004A1 - Power take-off device - Google Patents

Description

(5) ENERGY SELECTION DEVICE

one

The invention relates to converter technology and can be used for selecting energy: from the voltage of a thyristor cell of a high-voltage thyristor gate and the damping of voltage on a cell thyristor.

A device for protection of thyristors against overvoltages is known, in which a diode is connected in series with a resistor and a capacitor. Fortunately, the gift of unidirectional flow. through the capacitor, the latter stores the electrical energy of the GP.

The disadvantage of this device is that the energy stored in the capacitor is uselessly dissipated in the shunt resistor as soon as the diode is locked. . .

Closest to the present invention is a device that contains an RC circuit storage capacitors and diodes providing unidirectional flow of current through the storage capacitors 2.

However, after turning off the power thyristor, the current through the RC circuit does not flow until the reverse voltage across the thyristor becomes equal to the absolute value of the voltage on the storage capacitor. During the time of the so-called dead pause, no damping occurs on the 10 spins on the thyristor

The purpose of the invention is. improving the damping voltage on the Tiris. torus.

Delivered chain is reached

Claims (2)

15 by the fact that a device for taking energy, containing an RC circuit, connected in parallel to the thyristor through the first:) iodine, connected in reverse direction, and through the second diode, connected 20 in the forward direction and connected in series with the storage capacitor, is equipped with an additional capacitor, with an additional capacitor connected in parallel to the first diode. In addition, an additional capacitor can be connected in parallel to the power take-off in parallel from the first diode and the RC-circuit capacitor. FIG. Figure 1 shows a schematic diagram of a device for the selection of energy with an additional capacitor connected in parallel to the first one. DIODE; in fig. 2 - the same, an additional capacitor is connected in parallel to the circuit from the first diode and the capacitor of the RC circuit. The power take-off device contains an RC circuit consisting of resistor 1 and condenser 1, connected in parallel to thyristor 3 via diodes k and 5 connected in series with storage capacitor 6. Parallel to diode k, an additional capacitor 7 is connected. Storage capacitor 6 provides power to the imager 8 thyristor control pulses 3. The device operates as follows. During the non-conducting state of the thyristor, voltage jumps are applied to it due to external factors. These voltage points are damped by an RC circuit 1, 2, which due to the conductive state of one of the diodes k and S is connected in parallel to the thyristor 3. When the current of the RG circuit flows through diode 5, a storage capacitor 6 is charged. Charging The latter has a slight effect on the damping process on the voltage on thyristor 3, since in real devices the capacity of the storage capacitor considerably exceeds the capacitance of the capacitor 2 of the circuit, and the maximum voltage on the storage capacitor, like For example, it is limited at a level significantly lower than the level of the operating voltage of the thyristor 3. However, in the initial part of applying the voltage jump to the thyristor 3, as well as after changing the direction of current flow on RC circuit 1, 2, both diodes 4 and 5 appear locked until the voltage on the thyristor 3 is changed by an amount that is numerically equal to the voltage on the 4 capacitor 6. After that, conditions arise for switching on the diode that will allow the current to flow along the RC circuit 1, 2 in the required directed ii. In the section corresponding to the locked state of the diodes and 5, the voltage damping on the thyristor 3 is performed by an RC circuit consisting of a resistor 1 and series-connected capacitors 2 and 7. A device for taking energy with an additional capacitor 7 connected in parallel to a string of diode and the capacitor 2 operates essentially as in the device shown in Fig. 1, but in the areas corresponding to the conductive state of the diodes and 5, the voltage damping on the thyristor 3 is carried out by a circuit consisting of a resistor a 1 and parallel-connected capacitors 2 and 7, and when the diode is locked and 5 is an RC circuit from a resistor and a capacitor 7. Thus, the device eliminates a pause-free pause and improves the voltage damping on the thyristor Formula 1. Energy extraction device containing An RC circuit connected in parallel to the thyristor through a first diode connected in the opposite direction and through a second diode connected in the forward direction and connected in series with a storage capacitor, characterized in that, in order to improve the damping A voltage is connected to the thyristor; it is equipped with an additional capacitor, with an additional capacitor connected in parallel with the first diode. 2. The device according to claim 1, of which is an additional capacitor connected in parallel to the circuit from the first diode and the capacitor of the RC circuit. Sources of information taken into account in the examination 1.Patent of Germany No. U883 + 9, cl. H 02 H /, 1959. 2. USSR author's certificate №, cl. H 02 H 1/08, 1976. BUT i SU I 7 i