SU1647817A1 - Self-contained resonant inverter - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to electrical engineering, namely to power converter equipment, and m. used in power supplies for induction heating and melting devices. The aim of the invention is to enhance the functionality by increasing the limiting output frequency. The device contains an input inductive-capacitive filter 1 - 3. Between sections 2, 3 of a capacitor bank, inductor 4 is turned on, shunted by a compensating capacitor battery 5. There are 7-10 direct thyristors and 10- to 10-t thyristors in the shoulders of a single-phase valve bridge. 14 countercurrent. The battery of switching capacitors and switching reactors connected in series to the diagonal of bridge 6 are divided into two series-connected sections. One of them is formed by the reactor 15 and the capacitor 17, and the other by the reactor 16 and the capacitor 18. The currents 19 to 22 are connected to the thyristor control pulses 11 to 26. After the termination of the direct current thyristor interval, the unloading of the countercurrent thyristor of the same arm occurs after a period of output voltage. 5 il. “From 3 cl with

Description

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LL A L CL MUM

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Editor M. Blanan

Compiled by V. Polk Tehred M. Morgental

Proofreader T. Malets

Claims (1)

Claim A self-contained resonant inverter containing an input inductive-capacitive filter, in the capacitor bank circuit of which 25 a load circuit is connected, shunted by a compensating capacitor bank, as well as a single-phase valve bridge connected in parallel to the input terminals through the input filter reactor, in which 30 direct current thyristors are connected and counter current valves, and the input terminal of the bridge, connected through the reactor of the input filter with a positive input terminal, combines the anodes of thyristors of 35 direct current of the second and second arms and cathodes of the counter current valves of the same arms, the other input terminal of the bridge connected to the negative input terminal combines the cathodes of the thyristors 40 of the direct current of the third and fourth arms and the anode of the counter current valves of the same arms, and the diagonal of the bridge between the common point of the circuit thyristors of direct current of odd shoulders and a common point of the circuits of thyristors of direct current of 45 even couples formed by a series connection of a switching reactor and a battery of switching capacitors, characterized in that, in order to expand 50 functional possibilities by increasing the maximum output frequency, thyristors were used as counter current valves, four current transformers and four counter current thyristor control pulse generation units were introduced into the inverter, the input filter capacitor bank consists of two sections connected in series through a load circuit , the battery of switching capacitors and the switching reactor are two identical sections, and the extreme terminal of the winding of the switching reactor of the first The section is connected to the connection point of the direct current thyristor circuits of the odd shoulders of the valve bridge, the tap of the winding of this reactor is connected to the connection point of the thyristor of the opposite current of the same bridge arms, the second extreme terminal of the switching reactor winding of the first section is connected to the first section of the battery of switching capacitors, the extreme terminal of the switching winding the reactor of the second section is connected to the connection point of the thyristor circuits of the direct current of the even arms of the valve bridge; the tap of the winding of this reactor is connected to the point countercurrent thyristors connected to the same bridge arms, the second extreme terminal output of the switching reactor of the second section is connected to the second section of the switching capacitor bank, and the common point of the switching capacitors of both sections is connected to the midpoint of the load circuit, while the primary winding of the first current transformer is inserted into the thyristor circuit direct current of the first arm, and its secondary winding is connected to the block forming the control pulses of the thyristor of the counter current of the second arm, the primary winding of the second of the second current transformer is introduced into the circuit of the direct current thyristor of the second arm, and its secondary winding is connected to the control pulse generating unit of the third current countercurrent thyristor, the primary winding of the third current transformer is connected to the direct current thyristor circuit of the third arm, and its secondary winding is connected to the forming unit thyristor control pulses, fourth arm, the primary winding of the fourth current transformer is introduced into the thyristor circuit of a direct such fourth arm, and its secondary winding is connected inene with the block of formation of control imputations of the thyristor of the oncoming current of the first arm. l physical 5