SU536575A1 - Single phase inverter - Google Patents

Description

(54) SINGLE PHASE INVERTER

one

The invention can be used in power supplies of automation systems.

A single-phase inverter is known, which contains a power amplifier and a synchronization cascade in which the synchromeshating transistors of the cascade are connected in parallel to the weight and dimensions of the device and connected in parallel with the transistors of the amplifier through the primary windings of the synchronizing cascade. The transistor synchronous skin cascade operates in a pulsed mode, so the higher the permissible pulsed current of these transistors, the greater the permissible power of the power amplifier. The admissible impulse current of the thyristor (with the same weight and dimensions) is significantly higher than that of the transistors.

In the proposed device, in order to improve the reliability of i.e., the auxiliary winding of the output transformer is connected in series with each winding and / shulny transformer, the auxiliary windings being included in antiphase, the thyristors are used as controlled keys of the synchronizing stage.

The drawing is a diagram of the proposed inverter.

The power transistor 1 is open. In order to

close this transistor and open transistor 2, thyristor 3 is turned off (with an L-C circuit). On the windings of the pulse transformer 4, a voltage is induced, the winding 5 turns off the transistor 1, and the winding 6 turns on the transistor 2. After switching the power of the power transistors 1 and 2, the polarity of the voltage on the windings of the transformer 7 of the power amplifier changes sign. The thyristor 3 is closed, since it will be stitched by the power transistor 2. The winding from the transformer of the power amplifier 7 is connected to the output circuit of the thyristor in the output circuit (winding 8 for the thyristor 3 and winding 9 for the thyristor 9).

In order for the circuit to work normally with a continuous control signal applied to the inputs of thyristors 3 and 9 (for example, when connecting between aL-C-circuit and 5 winding points And positive feedback, taken from a transformer and 7 power amplifier), Unlock the control signal from the input of the thyristors after switching the power transistors.

The windings 12 and 13 of the transformer J provide the control signal to be blocked immediately after switching the power transistors. The voltage of the blocking windings 12 and 13 in this case should also be the value Ug Uwj2j3 Wg, where Ug is the direct voltage drop of the shodes.

In each particular case, the blocking circuit can have various modifications, for example, blocking windings, O1-shaking resistances can be inserted into the circuit. Then the aforementioned quantization to the great Uwi2, i z value is replaced

as follows

Uwi 2,13 R up.max. + Ug rjK K - limiting resistance;

max.max is the maximum value of the controlling GOK a.

Due to the large gain of the thyristors and the proposed scheme, an extremely large total gain in power is achieved.

Claims (1)

Invention Formula A single-phase inverter containing a power amplifier whose control keys through the primary windings of a pulse transformer are connected to the control keys of a clock stage whose inputs are connected to a positive feedback circuit, and the amplifier has an output transformer that is different in that and efficiency The auxiliary winding of the output transformer is connected in series with each winding of the pulse transformer, the auxiliary windings being included in antiphase, and the thyristors are used as controlled synchronous terminals.