SU1213516A1 - Self-excited resonant inverter - Google Patents

Description

I

The invention relates to electrical engineering (power semiconductor converters) and can be used to create electric arc power sources (gas discharge plasma torches), lasers, magnetrons, electric welding devices and other loads.

The main requirement imposed on 1; 1 power supplies for such consumers is to stabilize the output current regardless of the resistance of the load to the MocTif. .

The purpose of the invention is to expand the functionality by receiving a continuous output current of the inverter in a shape close to the meander, in a wide range of frequency control,

The drawing shows a diagram of the device.

The device consists of a thyristor bridge formed in parallel by engaging two pairs of series-connected thyristors 1-4, a switching circuit included in the diagonal of an alternating current of the specified thyristor bridge and consisting of the first 5 windings of the drossel and a capacitor 6 connected in series, connected in parallel with the first and consisting of a series-connected additional capacitor 7 and a second winding 8 throttle,. magnetically connected with the first one, with the free terminals of the second winding 8 of the throttle and the capacitor 7 connected to the connection points of the capacitor 6 and the first equipment H, Gunko 785/60, respectively

Compiled by And, Zherebina Tehred T. Dubinchak

Corr Sub

Circulation 632 VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d, 4/5

Filial PShT Patent, g, Uzhgorod, st. Project, 4

sixteen

the coils 5 are the first external switching circuits of the power supply circuit, and the load 9 is connected to the common points of connection of the capacitors and the windings of the resells of each switching circuit.

The inverter operates in the following manner.

When the thyristors 1 and 4 are unlocked, the capacitors 6 and 7 are recharged along the circuit: thyristor 1 - first winding 5 droplets - capacitor 6 and capacitor 7 - second winding 8 droselsel - thyristor 4 A current close to a sinusoidal half-wave flows through the thyristors ,

At the end of the current pulse, the thyristors turn off naturally and a pause occurs during which the discharge of capacitors 6 and 7 along the circuits takes place; capacitor 6 - load 9 - second winding 8 droplets and capacitor 7 - first winding 5 chokes - load 9, the discharge currents of both capacitors are summed on the load. Thus, during a pause in the load circuit, a current flows, the value of which is before the next thyristor pair 2 and 3 varies slightly. When thyristors 2 and 3 are opened, the reverse of the half-wave of the load current is formed. An increase in the load resistance leads to an increase in the voltage on the capacitors, since by the time of the next opening of the thyristors they do not have time to fully discharge, therefore the current in the load remains unchanged, the magnetic coupling between the windings contributes to an increase in the Current stabilization factor and improvement in its shape.

Proofreader L, Patay Subscription

Claims (1)

AUTONOMOUS RESONANCE INVERTER, containing a thyristor bridge, the diagonal of the alternating current of which includes a switching circuit consisting of series-connected windings of the inductor and capacitor, to the connection point of which the first output terminal is connected, characterized in that, in order to expand the functionality by obtaining a continuous output current in a shape close to the meander in a wide range of frequency regulation, an additional capacitor is introduced into it, μ the inductor is double-wound, m its second winding is magnetically connected to the first one, connected to the connection point of the main capacitor with the thyristors of the bridge and connected consequently to an additional capacitor connected to the connection point of the first winding of the inductor with the thyristors of the bridge, and the common point of the second winding and the additional capacitor is connected to second output pin. SU-, 1213516 ¹ 12