SU1224925A1 - Source of low-frequency voltage - Google Patents

Abstract

The invention can be used as a power source with a low frequency voltage. The purpose of the invention is to increase reliability by simplifying. The low-frequency voltage source contains transformers 1.2, rectifiers 4.5, bi-directional key 3, thyristors 7.8, and control unit 9. The primary windings of transformers 1.2 are connected in series and via bi-directional key 3 connected to the mains. Rectifiers 4.5 are connected to the secondary windings of transformers 1.2 and connected in opposite ways to the output. The outputs of rectifiers 4.5 are shunted respectively by thyristors 7.8. The thyristor 7,8 and key 3 control inputs are connected to the control unit 9. The above connection of the primary windings of transformers 1.2 allows, when receiving a low-frequency alternating voltage, to use only one bi-directional key 3, which simplifies the device and increases its reliability. silt i (I th 4 CO ca SP

Description

The bridging relates to electrical engineering and can, in particular, be used to power gas cleaning electrostatic filters.

The purpose of the invention is to increase reliability by simplifying.

The drawing schematically shows the proposed device.

The device contains two transformers 1 and 2s connected by primary windings 1-1 of them in series with bi-directional switch 3 and the network. The secondary windings of transformers 1 and 2 are connected to bridge rectifiers 4 and 5, the outputs of which; included in series between the terminals of the load 6. The DC terminals of the rectifiers 4 and 5 are shunt, thyristors 7 and 8, the control inputs of which, 5 as well as the bi-directional switch 3, are connected to the control unit 9.

The device is designed to create at the load of 8 alternating voltage a low (25 Gd and below) frequency. To create voltages of the same polarity, the control unit 9, which is made in a known manner, sends a signal to the bi-directional key 3 and the thyristor 7. In this case, the transistor (Ormator 1) is shorted on the secondary side by the bi-directional key 3, which serves for current flow to the load 6 from the bridge

Editor N. Gorvat Order 1959/54

Compiled by V. Rudensky

Tehred I.Popovich Proofreader I. Muska

Circulation 631 Subscription

VNIIPI USSR State Committee

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

Production and printing company, Uzhgorod, st. Design, -i

24925I

rectifier 5 supplied from transformer 2. To change the polarity of the voltage on the load, the etching unit 9 removes the signals from the bi-directional switch key 3 and the thyristor 7, and then with a pause sends a signal to the thyristor 8 and the same bidirectional switch 3 .

Claims (1)

10 claims A low-frequency voltage source containing a bi-directional key connected between one of the 15 input pins and the beginning of the primary winding of the first transformer, the second transformer, two bridge rectifiers connected from the alternating current side to the secondary winding of the corresponding transformer, the DC outputs of which are connected between the sybzhy and in each case are shunted each) the opposite direction25 by the thyristor, while the free outputs of the bridge rectifiers are connected to the output pins, which is characterized by the fact that, in order to improve reliability by 30 simplify, the start of the primary winding of the second transformer is connected to the terminal end of the primary winding of the first transformer, and the end of the second transformer is connected to another input terminal.