SU1474815A1 - Resonant inverter - Google Patents

Abstract

The invention relates to a converter technique. The goal is to expand the frequency range as the output power increases. The device contains a thyristor bridge 1-4. The switching choke 7 is provided with a bias winding 8 connected to a variable resistor. When the output frequency of the inverter decreases, the resistance of the variable resistor 9 decreases. The increased bias current will cause an increase in the inductance of the commutating throttle 7 and will adjust the resonant circuit to the reduced frequency. 1 il.

Description

(21) 4088155 / 24-07

(22) 07/10/86

(46) 04.23.89. Bul Number 15

(71) Irkutsk Polytechnic Institute

(72) M.P.Dunaev, I.V.Muzychenko and S.A. Tarasov

(53) 621.314.572 (088.8) (56) USSR Copyright Certificate No. 1317615, cl. H 02 M 7/517, 1986. Berkovich E.I. and others. Thyristor converters of high frequency. L .: Energie, 1973, p. 46, fig. 3-16.

(54) RESONANT INVERTER (57) The invention relates to a converter technique. The goal is to expand the frequency range as the output power increases. The device contains a thyristor bridge 1-4. The switching choke 7 is provided with a bias winding 8 connected to a variable resistor. When the output frequency of the inverter decreases, the resistance of the variable resistor 9 decreases. The increased bias current will cause an increase in the inductance of the commutating throttle 7 and will adjust the resonant circuit to the reduced frequency. 1 il.

SS

(ABOUT

+ o

eight

R

-ABOUT-

7h

S

J -

&

oo

ate

72

7

11474815

refers to electrical |

general

technology, namely, converters of direct current energy into alternating current energy of raised frequency.

The goal is to extend the frequency range while increasing the output power.

The drawing shows the scheme of the inverter.

The inverter contains a bridge on thyristors 1-4 with switching capacitor 5 connected in series with the load b,, and choke 7. The switching choke 7 is equipped with a bias winding 8, one end of which is connected to the positive input terminal, and the other end is connected via a variable resistor 9 to negative input pins.

The inverter works as follows.

Alternately open pairs of thyristors 1.4; 2.3; 1.4, etc. The capacitor 5 recharges according to the oscillatory law.

Suppose that a pair of thyristors J, 4 is open, the current flows through the circuit: 7-1-5-6-4. After complete recharging of the capacitor 5, the thyristors J and 4 are closed. Next, a pair of thyristors 2 and 3 is turned on and the process is repeated. In the load flows alternating current pe | resonator and commuting condensate; ra. Inverter output frequency defined. is made by the frequency of switching on thyristor pairs.

The introduction of a variable resistor and a biasing winding of a switching throttle allows to increase the output power of the inverter in the case of an active load with a decrease in its frequency due to an increase in the width-1 of current pulses.

To adjust the resonant circuit while decreasing the output frequency of the inverter, the resistance of the variable resistor 9 should be reduced. At the same time, the increased bias current

will cause an increase in the inductance of the commutating throttle and will adjust the resonant circuit to the reduced frequency.

By increasing the output frequency

it is necessary to increase the resistance of the variable resistor.

Claims (1)

Invention Formula Resonant inverter containing a thyristor bridge connected to the input pins via a switching choke with series-connected switching capacitor and a circuit load in the diagonal of the alternating current, characterized in that, in order to expand the frequency range with increasing output power, it is equipped with variable power torus and winding of the switching magnet of the switching throttle connected through a resistor to the input terminals.