CS239740B1 - Connexion for pulse converter with controlled output filter - Google Patents

Abstract

Splitting inverter with controlled output filter is designed for high-voltage power applications with large voltage fluctuations network and in a wide range of load current sizes. It enables optimal design of the commutation circuit Thyristor switch. That moment output filter thyristor switching is given the magnitude of the load current that determines the size the voltage to which the commutation must be charged thyristor switch capacitor to his extinguishing process could take place properly.

Description

(54) Connection of pulse converter with controlled output filter

The half-converter with controlled output filter is designed for high-voltage power applications with a large power supply voltage fluctuation range and a large load current range. It allows optimal design of the thyristor switch commutation circuit. The moment of output filter thyristor switching is given by the size of the load current, which determines the voltage to which the thyristor switch commutation capacitor must be charged in order for its quenching process to proceed properly.

? _ 3 «i

2.40 in* 'ΐ 2.44 = ΎιΎ \ 2

1 81 1

The invention relates to a pulse converter with a controlled output filter, in particular for high-voltage power applications.

The known simplest forms of pulse converters used hitherto have a number of drawbacks with a wide range of voltage fluctuations in the supply network and a large range of load current or in a multi-system power supply:

a / the commutating circuit of the pulse converter must be disadvantageously designed for the limit parameters of the circuit, ie the maximum load current and the lowest supply voltage level.

b / the need to limit the performance parameters at low supply voltage values due to commutation.

c / if the multi-system power supply of the pulse converter circuit is considered, the individual values of the commutating capacitors or inductance in the commutating circuit required for the given power supply system must be contacted.

All of these disadvantages are eliminated by connecting a pulse converter according to the invention by connecting a DC voltage source through an input filter to a switch input, the output of which is connected to the input of a controlled output filter consisting of a thyristor cathode and one smoothing inductor terminal; and the second load terminal, together with the thyristor anode, is connected to the negative source saw.

An exemplary embodiment is shown in FIG. The DC voltage of the source 1 is fed through an inlet filter 6 formed by a filter inductance 2.10 and a filter capacitor 2.11 to the input of a thyristor switch 6 comprising, in addition to the semiconductor components, a commutating inductance Aul. and a commutation capacitor Aa1 and longer through a controlled output filter 6 formed by a thyristor 4,10 and a smoothing inductance AJA per load 6.

An example of a circuit solution is shown in Fig. 2. The DC voltage of the power supply 2 is connected through an inlet filter consisting of a series parallel-parallel inductance 2.1 and a capacitor 2.2 to the input of the thyristor switch formed by the serioparallel * £, commutative inductance £ * £, limiting inductance 3.7. The output of the thyristor switch is connected through a controlled output filter consisting of a thyristor 4.1 and a smoothing inductor 4.2 to the load £.

The function of the pulse converter with controlled output filter according to Fig. 1 and 2 is as follows: The main thyristor 3.2 is switched on by means of a control pulse. After the load current and thyristor current 4.1 of the output filter have been turned into thyristor 3.2, the load current flows through the main branch of the switch. When the arc thyristor 3.5 is switched on, the oscillation process begins in the circuit of the commutating capacitor Ad. and commutation plus inductance limiters 3.6 and 3.7.

This results in a sinusoidal current sinusoidal current in the LC circuit, which in the branch of the antiparallel pair thyristor 3.2. the diode 3.3 and the commutation inductor 3.6 add to the load current £. After switching off the current in the main branch of the switch, the extinguishing branch of the switch, which is formed by the capacitor 3.1, flows. antiparallel pair thyristor 3.5. diode 3.4 and inductance limiter 3.7 load current until the output filter thyristor 4.1 turns on.

After the load current from diode 3.4 to the thyristor 4.1 is switched, the load current is taken over by the thyristor Ad · The moment of switching on the thyristor 4.1 of the discharge filter is given by the load current. so that the quenching process in the thyristor switch can proceed correctly.

Claims (1)

SUBJECT OF THE INVENTION Connection of pulse converter with controlled output filter especially for high-voltage power converters with large voltage fluctuation range and large load current range, characterized in that the output of the thyristor switch (3) is connected to a common thyristor cathode point (4.10) and one terminal a smoothing inductor (4.11) of the controlled output filter (4), the second smoothing inductor (4.11) being connected to the first load terminal (5) and the second load terminal (5) together with the thyristor anode (4.10) connected to the negative pole of the DC source / 1 /.