SU270054A1 - DEVICE FOR MANAGING THE INVERTER THYRISTORS - Google Patents

Description

Devices for controlling the inverter thyristors are known, consisting of a pulse generator with two paraphase outputs, a power supply unit, six thyristors and six pulse transformers with primary and secondary windings. Known devices are complex.

The proposed device is characterized in that for simplifying the auxiliary thyristors are connected in series, the anode of the first thyristor is connected to the positive pole of the power supply unit, the cathodes of each of the thyristors are connected to a circuit of series-connected resistances and primary windings of pulse transformers, the second ends of all primary windings of which are connected between each other and connected to the negative pole of the power supply, and each pulse transformer has two secondary windings, the first of which are single sequence and connected through a resistor to the power supply, the second output are, and, And The control electrodes of the thyristors odd circuits are interconnected and connected to an output of said pulse generator and the even - to another output of the generator. To return the device to the initial state between the anode and the cathode of the first thyristor, the price includes an emitter and collector of the transistor, the base of which is the opening pulse from the auxiliary winding of the Pulse transformer connected to the cathode of the sixth thyristor of the circuit. To obtain wide pulses, parallel to each of the six thyristors of the circuit, emitter – base transitions of transistors are included, in whose collector circuits the above-mentioned primary windings of pulse transformers are included.

Pa figs. 1 is a schematic diagram of the proposed device for a variant of a six-phase inverter circuit, where 1-6 low-power thyristors; 7 - return transistor; 8-J3-

pulse transformers with a rectangular loop; 14 - hysteresis pulse generator. Pa figs. 2 dan-variant of the scheme for obtaining wide control pulses.

Depending on the control signal, the frequency of the master oscillator, M, is assembled according to any well-known scheme, for example, according to the scheme of Royer’s generator.

Pumps of one polarity are fed to all odd thyristors f, 3, 5, and impulses

the other polarity is for even thyristors 2, 4, 6, with all thyristors connected in series. The cathodes of each thyristor are connected to the negative pole of the power source through pulse transformers,

hysteresis. With the help of windings 15-20 permanently connected to the power source, the cores are in one of the saturated states.

The order of operation of the device is as follows. When applying opening pulses to odd thyristors, only the thyristor I is opened, since thyristors 3 and 5 are separated from the power source by closed thyristors 2 and 4.

Transformer 8 is reversal reversal, forming control impulses on secondary windings 21-26 to ignite the inverter power thyristors. The number of output windings is determined by the inverter circuit.

Next, the generator pulses arrive at all the even thyristors 2, 4, 6. This opens only thyristor 2, since thyristors 4 to 6 are separated from the source plus by closed thyristors 3 and 5. At the same time, control pulses are generated at the output of the next pulse transformer .

Then, pulses are again supplied to the thyristors I, 3, and 5. At that, only thyristor 5 and so on opens. Thus, with each pulse of the master oscillator, the sequential connected thyristors are switched on alternately, and consequently, the control pulses are generated in turn. To perform cycling after opening the thyristor 6, the circuit returns to its initial state. For this, a pulse from the additional winding ab of transformer 13 opens a transistor connected in parallel with the first thyristor; the latter is switched off, since the voltage drop on the open transistor is less than the threshold voltage of the thyristor. The duration of the impuser winding a b is hundreds of microseconds, after which the transistor closes and the circuit is in the initial state. The next pulses of the generator 14 open the thyristor / etc. The Rasimotrennaya circuit carries out the division of the frequency on the tongue. In principle, it is possible to divide the frequency by any integer determined by the number of thyristors. Thus, for controlling a 12-phase inverter, such a device will contain 12 low-power thyristors.

In the considered device, the thyristors simultaneously perform the functions of frequency division and generation of control pulses, which simplifies the circuit.

The device has a high noise immunity, uncritical parameters of the elements used, which provides increased reliability of inverter systems as a whole. If it is necessary to obtain wide control pulses (60 e. Degrees, 120 e. Degrees, etc.), the circuit will look like

in fig. 2. In parallel, each thyristor includes control emitter-base electrodes of the transistor 27-31, the collector of which includes output pulse drivers. Each time the thyristor is turned on, the next-to-last shunts the non-junction emitter-base transistor, and the transistor turns off. The duration of the output pulse is determined by the interval between two successive pulses of the clock generator. Thus, when the electrodes are turned on, the emitter-base of the transistor parallel to one thyristor is 60 em. hail., when turned on in parallel to two thyristors - 120 e. hail, etc.

The proposed device is manufactured and tested in a prototype thyristor frequency converter.

Subject invention

Claims (3)

1.A device to control the inverter thyristors, consisting of a pulse generator with two paraphase outputs, block power, six thyristors and six imiuls transformers with primary and secondary windings, characterized in that, for the purpose of simplification, the thyristors are connected in succession, with the anode of the first thyristor connected to the positive voltage of the power supply unit, to the cathodes of each of the thyristors is connected a circuit of sequentially connected resistances and primary windings and xHulse transformers, the second ends All primary windings of which are interconnected and connected to the negative pole of the power supply unit, and each pulse transformer has two secondary windings, the first of which are connected sequentially and connected via a resistance to the power supply unit, the second ones are output, and the control electrodes of the odd thyristors of the circuit are connected between themselves and connected to one of the outputs of the specified pulse generator, and even - to the other output of this generator. 2. The device according to claim 1, characterized in that, in order to return the device to its original state, between the anode and the cathode of the first The thyristor cei includes an emitter and a collector of the transistor, to the base of which an opening pulse is fed from the additional winding of a pulse transformer connected to the cathode of the sixth thyristor of the circuit. 3. Device but neither. 1 and 2, characterized in that, in order to obtain wide pulses, non-emitter codes - a base of transistors, in whose collector circuits are connected, parallel to each of the six thyristors Included are the primary windings of the imimly transformers mentioned above. iiS fi TO J : 25: w 2D / j .. x, 2 jj j r