SU1248005A1 - Thyristor pulsed d.c.voltage converter - Google Patents

Abstract

The invention relates to the field of converter technology and can be used for j6HTb in power supply systems of electric drive and thyristor excitation of electric machines. The purpose of the invention is to improve the energy performance of the converter. The pulse converter contains a Thyristor (t) I, an anode connected to the positive of the power source with a constant current, and a cathode. - to one of the terminals for connecting the load circuit 5, diodes (D) 2,3, 4, soy cathodes (L

Description

with T1 cathode, key element 6, pulse transformer (IT) .8 with primary 9 ji secondary 7 windings, circuit of anti-serially connected DY and zener diode 1, connected in parallel to winding 9, capacitor 12 and circuit of series-connected D 13 and resistor 14. The anodes DZ and D13 are connected to the end of the winding 9 and to one of the plates of the capacitor 12. Another plate of the capacitor 12 is connected to

The invention relates to a conversion technique and can be used in power systems for electric drives and thyristor excitation of electric machines.

The aim of the invention is to improve the energy performance of a converter by reducing losses in a pulse transformer.

The drawing shows in principle the electrical circuit of the proposed pulse converter.

An input of thyristor 1 is connected to the input output — the positive pole of the power supply — the converter, the cathode of which is connected to the cathodes of diodes 2–4 and the output output — positively {1M output — to connect the load 5, the negative lead that is connected to the return anode diode 4 and the common terminal is the negative pole of the power supply. One output of the key element 6 is connected to the end of the secondary winding 7 of the pulse transformer 8, the beginning of which is connected to the anode of diode 2, with the beginning of the primary winding 9 of the pulse transformer Hang, the cathode of diode 10 connected to the anode of the stabilizer 11, the cathode of which is connected to one capacitor plate 12, with the end of the primary winding 9 of the pulse transformer B, with the anode of diode 3 and with the anode of diode 13, the cathode of which is connected to a resistor 14, the second terminal of which is connected to a common terminal.

the anode of T1 and, through the key element 6, with a common connection point at the beginning and end of the windings 9, 7 NTV. The anode D2 is connected to the start of the secondary winding 7. The anode D4 is connected to another terminal for connecting load 5, to the resistor level .14 and to the minus of the power source. The introduction of a DZ and the above connection of converter elements make it possible to exclude IT8 from the charge circuit of capacitor 12 and reduce losses in its windings. 1 il.

Another output of the key element 6 is connected to the other plate of the capacitor 12 and to the anode of the thyristor 1.

The preferred converter operates as follows.

When the supply voltage is applied, the capacitor 12 is charged along the circuit: the positive pole of the power source, the capacitor 12, the diode 3, the load 5,. the negative pole of the power source to the voltage of the power source, plus on the left capacitor plate. When a control pulse is applied, the ty-: resistor 1 is connected to the following circuit: the positive pole of the power supply, the thyristor 1, the load 5, the negative pole of the power supply flows the load current. For switching off the thyristor 1, the key element 6 is turned on and the voltage of the capacitor 12 is applied to the primary winding 9 of the pulse transformer 8 along the circuit: the positively charged plate of the capacitor 12, the key element 6, the primary winding 9 of the transformer B, the negatively charged plate of the capacitor 12. In the secondary The winding 7 of the pulse transformer B induces an emf which, through diode 2, is applied to the thyristor 1 in the locking direction. The locking current flows through the circuit: plus the secondary winding 7 of the pulse transformer 9, diode 2, thyristor, key element 6, minus the secondary winding 7 of the pulse transformer B, Thyristor I is turned off.

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 Diode 10 and zener diode. I1 create a demagnetization circuit of the core of the pulse transformer 8.

In idle mode and low loads, the charge of the capacitor -12 is carried out along the following lines: the positive pole of the power supply, condensate 12, diode 13, resistor 14, and the negative pole of the power supply.

Thus, by removing the pulse transformer from the capacitor charge circuit and reducing the losses in its windings, the energy performance of the converter and the efficiency are improved.

Claims (1)

Invention Formula Thyristor DC voltage pulse converter containing input, output and common leads for connecting respectively a DC voltage source and a load, a power thyristor connected between the input and output terminals, a key element, a capacitor, one plate of which is connected Compiled by T. Dobrovolskie Editor A. Lezhnina Tehred G. Gerber. Proofreader, V. Sinitska Order 4137/55 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. Project, 4 05 four to the common point of connection of the key element, the anode of the thyristor and the input terminal, the first diode, the cathode connected to the cathode of the power one. a torus, and the anode with a common “pulse transformer, the primary winding of which is shunted by a demagnetizing circuit including a second connected in series a diode, a zener diode, with the free output of a key element connected to the common connection point of the beginning of the primary and the end of the secondary windings of the pulse transformer, the beginning of the secondary winding is connected to the anode of the third diode, the cathode of which is connected to the cathode of the power thyristor, and the end of the primary winding to the anode of the fourth diode, whose cathode through a resistor is connected to a common terminal, distinguished by In addition, a fifth diode is added to it, the cathode of which is connected to the cathode of the power thyristor, and the anode - to the end of the primary winding of the pulse transformer and the other capacitor plate.