SU604101A1 - Arrangement for control of blocking thyristor - Google Patents

Description

one

The invention is intended for use in converter semiconductor technology, for example for controlling inverters comprising a parallel-series connection of lockable thyristors.

Devices for controlling lockable thyristors are known, consisting of formal multivibrators supplying transformers from which the control voltage is removed, and negative feedback circuits through the load.

The disadvantage of such devices is that they cannot be used to control groups of serially connected thyristors,

The closest solution to the present invention is a device for controlling thyristors, containing two magnetic-field multivibrators, synchronized with each other by means of a magnetic amplifier CH. Multivibrators supply primary (Stocks of forming transformers, from the secondary windings of which the thyristor control voltage is removed from the resistor-diode circuits,

This voltage is a variable (bipolar) rectangular voltage with an adjustable half-wave duration.

The disadvantage of such a device is that the use of an alternating voltage to control the thyristors leads to an overload of their control circuits and a large power consumption of the control system. This increases the bulkiness of the control system. The formation of bipolar discrete control pulses with a certain duty cycle, i.e. with the presence of current-free moments between them, in this modulator it is impossible because of the occurrence of spurious emissions arising after the passage of the main pulse, and dramatically reducing the functional reliability of the device. It should also be noted that as the number of thyristors to be controlled increases, the complexity and bulkiness of this device will proportionally increase.

The purpose of the invention 1 and is to improve reliability by eliminating spurious emissions in the output. : control pulses. This goal is achieved by the fact that in the device for controlling the lockable dash | Stores containing a generator of starting pulses connected via a trigger with two anti-phase outputs to the input of a push-pull transistor converter including transistors, biased by reverse diodes, and an output pulse transformer, a power source connected between the midpoint of the primary transistor transistor and the transistor connection point converter, power supply is made in the form of a body of unipolar pulses, the input of which is connected to the trigger input. The drawing shows a flash electrical diagram of a device for controlling lockable thyristors. The device consists of a generator of locking pulses connected by an output to a series-connected main windings 2 and 3 of an output pulse transformer 4. The other ends are each connected to the collector of their transistor 5 and 6. The transistors are biased in the opposite direction by reverse diene. 7 and 8. The bases of the transistors 5 and 6 are connected to the anti-phase outputs of the 9 O flip-flop with the counting input of the trigger pulse generator 1, trigger pulses are given. pulses are given starting pulses. The device operates. The next example. The starting impulse arrives at the input of trigger 9 and the input of generator 1. In this case, the trigger switches to another steady state, switching transistors 5 and 6, and the generator produces a positive rectangular voltage pulse. Suppose that this moment the transistor 6 is open, and the transistor 5 is closed. A pulse from the generator passes through the winding 3 and the transistor 6, inducing a negative voltage pulse relative to the ends of the windings on the secondary windings of the pulse transformer 4. At the end of the impulse from the generator, the energy stored by the E magnetic field of the pulsed tranno-formal-ora begins to dissipate, trying to change the polarity of the voltage on the secondary windings, i.e., to form a parasitic ejection of the opposite main polarity. With STOM, the polarity of the voltage also changes at the primary windings of the transformer. However, for such polarity, the primary windings turn out to be connected in series through the open saturated transistor 6 and

The use of the proposed device for controlling converters on lockable thyristors will increase the reliability of operation of converters to reduce the complexity of control systems.

Claims (3)

Claims An apparatus for controlling the locking of the thyristors, containing the generator running 7, As a result, the total capacitance on the primary windings is determined by the direct voltage drop across the saturated transistor 6 and the open diode 7, which prevents the occurrence of a parasitic surge. When the next trigger pulse arrives, the device operates in the same way, the transistor 5 opens, the current passes through the primary winding 2, and a positive control pulse is generated on the secondary windings. At the end of the pulse, the energy stored in the magnetic field of the transformer is dissipated through the open transistor 5 and diode 8. Thus, when a series of trigger pulses arrives, bipolar control pulses without spurious emissions with a frequency and phase determined by the frequency and phase of the trigger are generated in the windings of the pulse transformer. pulses. At the same time, according to the law of energy conservation, the power dissipated by transistors at the time of the discharge inductance of the transformer dissipation does not exceed the power released during the formation of the main pulse. ticks connected via a trigger with two anti-phase outputs to the input of a push-pull transistor converter, including transistors, shunted by reverse diodes j, and an Eipulse pulse transformer, the power supply connected between the midpoint of the primary winding of the output transformer and the junction point of the transistor transistors,. that, in order to increase reliability by eliminating spurious emissions in the output control pulses, the power source is designed as irovatel unipolar pulses having an input coupled to the input of the flip-flop. Sources of information taken into account during the examination: 1.KDCCOB O, A., Khasaev OI. Fully controlled triggers in automation devices M., Energii, 1970, p. 89-91, fig. 4-2. 2. USSR author's certificate N9 216831, cl. And 02 M 1/08, 1968. 3. Moin V, S:., Laptev N. N. Stabilized transistor converters, M., Energie, 1972, p. 307, fig. 9-, 3.